AppBarLayout.java revision 4b25d63ff53d4676150ac54897851e4ff9f1049f
1a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes/* 2a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Copyright (C) 2015 The Android Open Source Project 3a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 4a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Licensed under the Apache License, Version 2.0 (the "License"); 5a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * you may not use this file except in compliance with the License. 6a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * You may obtain a copy of the License at 7a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 8a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * http://www.apache.org/licenses/LICENSE-2.0 9a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 10a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Unless required by applicable law or agreed to in writing, software 11a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * distributed under the License is distributed on an "AS IS" BASIS, 12a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * See the License for the specific language governing permissions and 14a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * limitations under the License. 15a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 16a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 17a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banespackage android.support.design.widget; 18a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 198e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikasimport static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP; 208e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikasimport static android.support.design.widget.ViewUtils.objectEquals; 218e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas 22ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikasimport android.animation.ValueAnimator; 23a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.content.Context; 24a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.content.res.TypedArray; 2500a00a7d3ba8279294f63994473afc32e05dcf10Chris Banesimport android.graphics.Rect; 261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banesimport android.os.Build; 27e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banesimport android.os.Parcel; 28e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banesimport android.os.Parcelable; 2950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport android.support.annotation.IntDef; 3072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banesimport android.support.annotation.NonNull; 3172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banesimport android.support.annotation.Nullable; 328f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viveretteimport android.support.annotation.RequiresApi; 33c39d9c75590eca86a5e7e32a8824ba04a0d42e9bAlan Viveretteimport android.support.annotation.RestrictTo; 3413633353237d6506f4c436b459bc8be8c3d7ed68Chris Banesimport android.support.annotation.VisibleForTesting; 35a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.support.design.R; 3605f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banesimport android.support.v4.view.AbsSavedState; 37a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.support.v4.view.ViewCompat; 386ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banesimport android.support.v4.view.WindowInsetsCompat; 39a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.util.AttributeSet; 40a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.View; 41a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.ViewGroup; 42a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.animation.Interpolator; 43a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.widget.LinearLayout; 44a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 4550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.Retention; 4650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.RetentionPolicy; 47d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport java.lang.ref.WeakReference; 48631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banesimport java.util.ArrayList; 49a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport java.util.List; 50a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 51a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes/** 52a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * AppBarLayout is a vertical {@link LinearLayout} which implements many of the features of 539fb154338a62edc2c57dc036895199d6f1769400Chris Banes * material designs app bar concept, namely scrolling gestures. 54a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 55a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Children should provide their desired scrolling behavior through 56a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams#setScrollFlags(int)} and the associated layout xml attribute: 57a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@code app:layout_scrollFlags}. 58a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 59a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 60a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * This view depends heavily on being used as a direct child within a {@link CoordinatorLayout}. 61a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * If you use AppBarLayout within a different {@link ViewGroup}, most of it's functionality will 62a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * not work. 63a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 649fb154338a62edc2c57dc036895199d6f1769400Chris Banes * AppBarLayout also requires a separate scrolling sibling in order to know when to scroll. 659fb154338a62edc2c57dc036895199d6f1769400Chris Banes * The binding is done through the {@link ScrollingViewBehavior} behavior class, meaning that you 669fb154338a62edc2c57dc036895199d6f1769400Chris Banes * should set your scrolling view's behavior to be an instance of {@link ScrollingViewBehavior}. 679fb154338a62edc2c57dc036895199d6f1769400Chris Banes * A string resource containing the full class name is available. 68a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 69a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <pre> 70a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.CoordinatorLayout 71a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:android="http://schemas.android.com/apk/res/android" 72a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:app="http://schemas.android.com/apk/res-auto" 73a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 74a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent"> 75a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 76a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v4.widget.NestedScrollView 77a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 78a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent" 79a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_behavior="@string/appbar_scrolling_view_behavior"> 80a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 81a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <!-- Your scrolling content --> 82a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 83a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.v4.widget.NestedScrollView> 84a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 85a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.AppBarLayout 86a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="wrap_content" 87a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent"> 88a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 89a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v7.widget.Toolbar 90a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 91a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 92a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 93a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.TabLayout 94a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 95a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 96a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 97a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.AppBarLayout> 98a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 99a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.CoordinatorLayout> 100a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </pre> 101a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 102a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see <a href="http://www.google.com/design/spec/layout/structure.html#structure-app-bar"> 103a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * http://www.google.com/design/spec/layout/structure.html#structure-app-bar</a> 104a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 105a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes@CoordinatorLayout.DefaultBehavior(AppBarLayout.Behavior.class) 106a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banespublic class AppBarLayout extends LinearLayout { 107a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 108657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas static final int PENDING_ACTION_NONE = 0x0; 109657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas static final int PENDING_ACTION_EXPANDED = 0x1; 110657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas static final int PENDING_ACTION_COLLAPSED = 0x2; 111657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas static final int PENDING_ACTION_ANIMATE_ENABLED = 0x4; 1122bab57ed97f284a8152d180cca796739afa3a71dChris Banes static final int PENDING_ACTION_FORCE = 0x8; 1139995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 114a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 115631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Interface definition for a callback to be invoked when an {@link AppBarLayout}'s vertical 116631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * offset changes. 117a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 118631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public interface OnOffsetChangedListener { 119a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 120a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Called when the {@link AppBarLayout}'s layout offset has been changed. This allows 121a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * child views to implement custom behavior based on the offset (for instance pinning a 122a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * view at a certain y value). 123a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 124631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param appBarLayout the {@link AppBarLayout} which offset has changed 12550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes * @param verticalOffset the vertical offset for the parent {@link AppBarLayout}, in px 126a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 127631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset); 128a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 129a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 130a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private static final int INVALID_SCROLL_RANGE = -1; 131a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 132a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mTotalScrollRange = INVALID_SCROLL_RANGE; 133a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownPreScrollRange = INVALID_SCROLL_RANGE; 134a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownScrollRange = INVALID_SCROLL_RANGE; 135a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1361a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mHaveChildWithInterpolator; 13750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1389995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private int mPendingAction = PENDING_ACTION_NONE; 1399995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 1406ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes private WindowInsetsCompat mLastInsets; 1416ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 1421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private List<OnOffsetChangedListener> mListeners; 1431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mCollapsible; 1451a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mCollapsed; 1461a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1471a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private final int[] mTmpStatesArray = new int[2]; 148631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 149a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context) { 150a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes this(context, null); 151a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 152a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 153a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context, AttributeSet attrs) { 154a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 155a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes setOrientation(VERTICAL); 15650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 157809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes ThemeUtils.checkAppCompatTheme(context); 158809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes 1591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21) { 1601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Use the bounds view outline provider so that we cast a shadow, even without a 1611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // background 1621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setBoundsViewOutlineProvider(this); 1631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // If we're running on API 21+, we should reset any state list animator from our 1651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // default style 1661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setStateListAnimatorFromAttrs(this, attrs, 0, 1671a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes R.style.Widget_Design_AppBarLayout); 1681a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 1691a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1701a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AppBarLayout, 17150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 0, R.style.Widget_Design_AppBarLayout); 17247082c30c630c34829439a9eecd1cf7e8d255a86Aurimas Liutikas ViewCompat.setBackground(this, a.getDrawable(R.styleable.AppBarLayout_android_background)); 1739995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (a.hasValue(R.styleable.AppBarLayout_expanded)) { 1742bab57ed97f284a8152d180cca796739afa3a71dChris Banes setExpanded(a.getBoolean(R.styleable.AppBarLayout_expanded, false), false, false); 1759995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 1761a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21 && a.hasValue(R.styleable.AppBarLayout_elevation)) { 1771a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setDefaultAppBarLayoutStateListAnimator( 1781a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes this, a.getDimensionPixelSize(R.styleable.AppBarLayout_elevation, 0)); 1791a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 18050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes a.recycle(); 18150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1826ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes ViewCompat.setOnApplyWindowInsetsListener(this, 1836ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes new android.support.v4.view.OnApplyWindowInsetsListener() { 1846ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes @Override 1856ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public WindowInsetsCompat onApplyWindowInsets(View v, 1866ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes WindowInsetsCompat insets) { 1878818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes return onWindowInsetChanged(insets); 1886ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 1896ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes }); 190631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 191631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 192631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 193631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Add a listener that will be called when the offset of this {@link AppBarLayout} changes. 194631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 195631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener The listener that will be called when the offset changes.] 196631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 197631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @see #removeOnOffsetChangedListener(OnOffsetChangedListener) 198631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 199631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void addOnOffsetChangedListener(OnOffsetChangedListener listener) { 2001a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners == null) { 2011a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mListeners = new ArrayList<>(); 2021a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2036f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes if (listener != null && !mListeners.contains(listener)) { 2046f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.add(listener); 205631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 206631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 207631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 208631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 209631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Remove the previously added {@link OnOffsetChangedListener}. 210631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 211631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener the listener to remove. 212631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 213631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void removeOnOffsetChangedListener(OnOffsetChangedListener listener) { 2141a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners != null && listener != null) { 2156f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.remove(listener); 216631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 217a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 218a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 219a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 220ea004a01f44aaf36212120c936952c1742d03d30Chris Banes protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 221ea004a01f44aaf36212120c936952c1742d03d30Chris Banes super.onMeasure(widthMeasureSpec, heightMeasureSpec); 222ea004a01f44aaf36212120c936952c1742d03d30Chris Banes invalidateScrollRanges(); 223ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 224ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 225ea004a01f44aaf36212120c936952c1742d03d30Chris Banes @Override 226a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected void onLayout(boolean changed, int l, int t, int r, int b) { 227a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.onLayout(changed, l, t, r, b); 22879aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes invalidateScrollRanges(); 229a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 230a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = false; 231a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 232a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 233a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 234a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 235a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 236a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 237a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = true; 238a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 239a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 240a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 2411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 2421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes updateCollapsible(); 2431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 2451a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private void updateCollapsible() { 2461a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes boolean haveCollapsibleChild = false; 2471a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 2481a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (((LayoutParams) getChildAt(i).getLayoutParams()).isCollapsible()) { 2491a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes haveCollapsibleChild = true; 2501a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes break; 2511a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2521a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 25357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes setCollapsibleState(haveCollapsibleChild); 254a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 255a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 256ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void invalidateScrollRanges() { 257ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Invalidate the scroll ranges 258ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mTotalScrollRange = INVALID_SCROLL_RANGE; 259ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownPreScrollRange = INVALID_SCROLL_RANGE; 260ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownScrollRange = INVALID_SCROLL_RANGE; 261ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 262ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 263a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 264a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setOrientation(int orientation) { 265a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (orientation != VERTICAL) { 266a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes throw new IllegalArgumentException("AppBarLayout is always vertical and does" 267a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes + " not support horizontal orientation"); 268a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 269a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.setOrientation(orientation); 270a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 271a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 2729995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2739995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not, animating if it has already 2749995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * been laid out. 2759995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2769995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2779995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2789995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2799995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2809995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2819995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2829995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2839995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2849995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded) { 2859995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(expanded, ViewCompat.isLaidOut(this)); 2869995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 2879995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 2889995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2899995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not. 2909995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2919995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2929995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2939995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2949995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2959995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2969995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param animate Whether to animate to the new state 2979995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2989995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2999995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 3009995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded, boolean animate) { 3012bab57ed97f284a8152d180cca796739afa3a71dChris Banes setExpanded(expanded, animate, true); 3022bab57ed97f284a8152d180cca796739afa3a71dChris Banes } 3032bab57ed97f284a8152d180cca796739afa3a71dChris Banes 3042bab57ed97f284a8152d180cca796739afa3a71dChris Banes private void setExpanded(boolean expanded, boolean animate, boolean force) { 3059995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = (expanded ? PENDING_ACTION_EXPANDED : PENDING_ACTION_COLLAPSED) 3062bab57ed97f284a8152d180cca796739afa3a71dChris Banes | (animate ? PENDING_ACTION_ANIMATE_ENABLED : 0) 3072bab57ed97f284a8152d180cca796739afa3a71dChris Banes | (force ? PENDING_ACTION_FORCE : 0); 3089995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes requestLayout(); 3099995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 3109995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 311a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 312a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 313a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return p instanceof LayoutParams; 314a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 315a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 316a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 317a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateDefaultLayoutParams() { 318a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 319a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 320a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 321a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 322a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams generateLayoutParams(AttributeSet attrs) { 323a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(getContext(), attrs); 324a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 325a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 326a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 327a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3288f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viverette if (Build.VERSION.SDK_INT >= 19 && p instanceof LinearLayout.LayoutParams) { 329a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((LinearLayout.LayoutParams) p); 330a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (p instanceof MarginLayoutParams) { 331a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((MarginLayoutParams) p); 332a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 333a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(p); 334a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 335a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 336657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas boolean hasChildWithInterpolator() { 337a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mHaveChildWithInterpolator; 338a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 339a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 340a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 3416ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes * Returns the scroll range of all children. 342a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 343a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @return the scroll range in px 344a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 3456ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public final int getTotalScrollRange() { 346a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mTotalScrollRange != INVALID_SCROLL_RANGE) { 347a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mTotalScrollRange; 348a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 349a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 350a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 351a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 352a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 353a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 354ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 355a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 356a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 357a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 358a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 359b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += childHeight + lp.topMargin + lp.bottomMargin; 360a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 361a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 362a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing scroll, we to take the collapsed height into account. 3636ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // We also break straight away since later views can't scroll beneath 364a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us 3656ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes range -= ViewCompat.getMinimumHeight(child); 3666ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes break; 367a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 368a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 369a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 370a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 371a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 372a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 373a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 3744832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes return mTotalScrollRange = Math.max(0, range - getTopInset()); 375a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 376a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 377657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas boolean hasScrollableChildren() { 378a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return getTotalScrollRange() != 0; 379a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 380a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 381a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 382a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling up from a nested pre-scroll. 383a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 384657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas int getUpNestedPreScrollRange() { 38550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return getTotalScrollRange(); 386a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 387a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 388a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 389a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested pre-scroll. 390a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 391657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas int getDownNestedPreScrollRange() { 392a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownPreScrollRange != INVALID_SCROLL_RANGE) { 393a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 394a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownPreScrollRange; 395a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 396a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 397a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 398a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = getChildCount() - 1; i >= 0; i--) { 399a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 400a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 401ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 402a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 403a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 404a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.FLAG_QUICK_RETURN) == LayoutParams.FLAG_QUICK_RETURN) { 405b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // First take the margin into account 406b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += lp.topMargin + lp.bottomMargin; 407a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // The view has the quick return flag combination... 408a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED) != 0) { 409a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If they're set to enter collapsed, use the minimum height 410a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += ViewCompat.getMinimumHeight(child); 41147543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes } else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 41247543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // Only enter by the amount of the collapsed height 41347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes range += childHeight - ViewCompat.getMinimumHeight(child); 414a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 415116332176fa904af2f701011de8d4f2524c10a8eChris Banes // Else use the full height (minus the top inset) 416116332176fa904af2f701011de8d4f2524c10a8eChris Banes range += childHeight - getTopInset(); 417a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 418a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (range > 0) { 419a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we've hit an non-quick return scrollable view, and we've already hit a 420a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // quick return view, return now 421a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 422a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 423a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 42413633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes return mDownPreScrollRange = Math.max(0, range); 425a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 426a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 427a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 428a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested scroll. 429a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 430657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas int getDownNestedScrollRange() { 431a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownScrollRange != INVALID_SCROLL_RANGE) { 432a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 433a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownScrollRange; 434a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 435a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 436a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 437c1ce4f6cf4d99d6856c4259bf1bb1cb56f604737Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 438a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 439a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 440ea004a01f44aaf36212120c936952c1742d03d30Chris Banes int childHeight = child.getMeasuredHeight(); 441b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childHeight += lp.topMargin + lp.bottomMargin; 442a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 443a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 444a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 445a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 446a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 447a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 448a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 449a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 450a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing exit scroll, we to take the collapsed height into account. 4514832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes // We also break the range straight away since later views can't scroll 452a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // beneath us 4534832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes range -= ViewCompat.getMinimumHeight(child) + getTopInset(); 4544832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes break; 455a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 456a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 457a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 458a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 459a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 460a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 461a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 4624c33be829067714342b629d29329206bc2116afeChris Banes return mDownScrollRange = Math.max(0, range); 463a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 464a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 465657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas void dispatchOffsetUpdates(int offset) { 4661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Iterate backwards through the list so that most recently added listeners 4671a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // get the first chance to decide 4681a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners != null) { 4691a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = mListeners.size(); i < z; i++) { 4701a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final OnOffsetChangedListener listener = mListeners.get(i); 4711a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (listener != null) { 4721a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes listener.onOffsetChanged(this, offset); 4731a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4741a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4751a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4761a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4771a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 47850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int getMinimumHeightForVisibleOverlappingContent() { 47917ed3263761329f6aa6796941358c41001fff325Chris Banes final int topInset = getTopInset(); 48050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int minHeight = ViewCompat.getMinimumHeight(this); 48150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (minHeight != 0) { 48250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If this layout has a min height, use it (doubled) 4836ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes return (minHeight * 2) + topInset; 48450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 48550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 48650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Otherwise, we'll use twice the min height of our last child 48750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int childCount = getChildCount(); 488b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes final int lastChildMinHeight = childCount >= 1 489b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes ? ViewCompat.getMinimumHeight(getChildAt(childCount - 1)) : 0; 490b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes if (lastChildMinHeight != 0) { 491b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes return (lastChildMinHeight * 2) + topInset; 492b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes } 493b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes 494b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes // If we reach here then we don't have a min height explicitly set. Instead we'll take a 495b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes // guess at 1/3 of our height being visible 496b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes return getHeight() / 3; 49750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 49850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 4991a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Override 5001a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes protected int[] onCreateDrawableState(int extraSpace) { 5011a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int[] extraStates = mTmpStatesArray; 5021a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int[] states = super.onCreateDrawableState(extraSpace + extraStates.length); 5031a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 5041a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes extraStates[0] = mCollapsible ? R.attr.state_collapsible : -R.attr.state_collapsible; 5051a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes extraStates[1] = mCollapsible && mCollapsed 5061a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ? R.attr.state_collapsed : -R.attr.state_collapsed; 5071a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 5081a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return mergeDrawableStates(states, extraStates); 5091a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5101a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 511c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes /** 512c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * Sets whether the AppBarLayout has collapsible children or not. 513c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * 514c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * @return true if the collapsible state changed 515c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes */ 516c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes private boolean setCollapsibleState(boolean collapsible) { 5171a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mCollapsible != collapsible) { 5181a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mCollapsible = collapsible; 5191a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes refreshDrawableState(); 520c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return true; 5211a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 522c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return false; 5231a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5241a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 525c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes /** 526c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * Sets whether the AppBarLayout is in a collapsed state or not. 527c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * 528c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * @return true if the collapsed state changed 529c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes */ 530657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas boolean setCollapsedState(boolean collapsed) { 5311a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mCollapsed != collapsed) { 5321a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mCollapsed = collapsed; 5331a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes refreshDrawableState(); 534c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return true; 5351a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 536c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return false; 5371a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5381a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 53950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** 5401a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @deprecated target elevation is now deprecated. AppBarLayout's elevation is now 541926cd28257536b1206934d69585a2dab100147d5Chris Banes * controlled via a {@link android.animation.StateListAnimator}. If a target 542c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas * elevation is set, either by this method or the {@code app:elevation} attribute, 543926cd28257536b1206934d69585a2dab100147d5Chris Banes * a new state list animator is created which uses the given {@code elevation} value. 544631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 5451a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_elevation 54650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes */ 5471a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Deprecated 548631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void setTargetElevation(float elevation) { 5491a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21) { 5501a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setDefaultAppBarLayoutStateListAnimator(this, elevation); 5511a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 552631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 553631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 554631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 5551a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @deprecated target elevation is now deprecated. AppBarLayout's elevation is now 556926cd28257536b1206934d69585a2dab100147d5Chris Banes * controlled via a {@link android.animation.StateListAnimator}. This method now 557926cd28257536b1206934d69585a2dab100147d5Chris Banes * always returns 0. 558631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 5591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Deprecated 560631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public float getTargetElevation() { 5611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return 0; 56250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 56350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 564657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas int getPendingAction() { 5659995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes return mPendingAction; 5669995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 5679995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 568657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas void resetPendingAction() { 5699995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = PENDING_ACTION_NONE; 5709995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 5719995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 57213633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes @VisibleForTesting 57313633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes final int getTopInset() { 574ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0; 575ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 576ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 577657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas WindowInsetsCompat onWindowInsetChanged(final WindowInsetsCompat insets) { 5788818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes WindowInsetsCompat newInsets = null; 5798818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 5808818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes if (ViewCompat.getFitsSystemWindows(this)) { 5818818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes // If we're set to fit system windows, keep the insets 5828818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes newInsets = insets; 5838818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes } 5848818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 5858818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes // If our insets have changed, keep them and invalidate the scroll ranges... 58619a80415a88ecfae6bbc645cd14b653ed4337648Chris Banes if (!objectEquals(mLastInsets, newInsets)) { 5878818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes mLastInsets = newInsets; 5888818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes invalidateScrollRanges(); 5898818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes } 5908818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 59117ed3263761329f6aa6796941358c41001fff325Chris Banes return insets; 5926ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 5936ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 594a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static class LayoutParams extends LinearLayout.LayoutParams { 59550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 59650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** @hide */ 5978e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 59850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @IntDef(flag=true, value={ 59950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_SCROLL, 60050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_EXIT_UNTIL_COLLAPSED, 60150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_ENTER_ALWAYS, 602bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED, 603bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_SNAP 60450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes }) 60550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Retention(RetentionPolicy.SOURCE) 60650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public @interface ScrollFlags {} 60750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 608a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 609a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The view will be scroll in direct relation to scroll events. This flag needs to be 610a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * set for any of the other flags to take effect. If any sibling views 611a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * before this one do not have this flag, then this value has no effect. 612a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 613a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_SCROLL = 0x1; 614a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 615a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 616a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When exiting (scrolling off screen) the view will be scrolled until it is 617a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 'collapsed'. The collapsed height is defined by the view's minimum height. 618a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 619a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 620a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 621a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 622a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_EXIT_UNTIL_COLLAPSED = 0x2; 623a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 624a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 625a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When entering (scrolling on screen) the view will scroll on any downwards 626a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll event, regardless of whether the scrolling view is also scrolling. This 627a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * is commonly referred to as the 'quick return' pattern. 628a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 629a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS = 0x4; 630a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 631a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 632a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * An additional flag for 'enterAlways' which modifies the returning view to 633a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * only initially scroll back to it's collapsed height. Once the scrolling view has 634a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * reached the end of it's scroll range, the remainder of this view will be scrolled 635a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * into view. The collapsed height is defined by the view's minimum height. 636a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 637a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 638a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 639a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 640a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED = 0x8; 641a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 642a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 643bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Upon a scroll ending, if the view is only partially visible then it will be snapped 644bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * and scrolled to it's closest edge. For example, if the view only has it's bottom 25% 645bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * displayed, it will be scrolled off screen completely. Conversely, if it's bottom 75% 646bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * is visible then it will be scrolled fully into view. 647bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes */ 648bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public static final int SCROLL_FLAG_SNAP = 0x10; 649bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 650bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes /** 651bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Internal flags which allows quick checking features 652a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 653a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes static final int FLAG_QUICK_RETURN = SCROLL_FLAG_SCROLL | SCROLL_FLAG_ENTER_ALWAYS; 654bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes static final int FLAG_SNAP = SCROLL_FLAG_SCROLL | SCROLL_FLAG_SNAP; 6551a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes static final int COLLAPSIBLE_FLAGS = SCROLL_FLAG_EXIT_UNTIL_COLLAPSED 6561a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes | SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED; 657a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 658a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int mScrollFlags = SCROLL_FLAG_SCROLL; 659a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes Interpolator mScrollInterpolator; 660a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 661a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(Context c, AttributeSet attrs) { 662a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(c, attrs); 663c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.AppBarLayout_Layout); 664c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes mScrollFlags = a.getInt(R.styleable.AppBarLayout_Layout_layout_scrollFlags, 0); 665c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes if (a.hasValue(R.styleable.AppBarLayout_Layout_layout_scrollInterpolator)) { 666a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int resId = a.getResourceId( 667c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes R.styleable.AppBarLayout_Layout_layout_scrollInterpolator, 0); 668a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = android.view.animation.AnimationUtils.loadInterpolator( 669a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes c, resId); 670a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 671a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 672a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 673a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 674a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height) { 675a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height); 676a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 677a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 678a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height, float weight) { 679a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height, weight); 680a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 681a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 682a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(ViewGroup.LayoutParams p) { 683a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(p); 684a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 685a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 686a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(MarginLayoutParams source) { 687a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 688a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 689a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 6908f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viverette @RequiresApi(19) 691a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LinearLayout.LayoutParams source) { 6928f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viverette // The copy constructor called here only exists on API 19+. 693a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 694a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 695a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 6968f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viverette @RequiresApi(19) 697a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LayoutParams source) { 6988f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viverette // The copy constructor called here only exists on API 19+. 699a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 700a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = source.mScrollFlags; 701a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = source.mScrollInterpolator; 702a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 703a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 704a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 705a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the scrolling flags. 706a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 707a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param flags bitwise int of {@link #SCROLL_FLAG_SCROLL}, 708bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_EXIT_UNTIL_COLLAPSED}, {@link #SCROLL_FLAG_ENTER_ALWAYS}, 709bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED} and {@link #SCROLL_FLAG_SNAP }. 710a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 711a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollFlags() 712a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 71373e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollFlags 714a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 71550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public void setScrollFlags(@ScrollFlags int flags) { 716a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = flags; 717a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 718a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 719a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 720a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the scrolling flags. 721a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 722a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollFlags(int) 723a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 72473e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollFlags 725a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 72650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @ScrollFlags 727a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public int getScrollFlags() { 728a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollFlags; 729a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 730a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 731a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 732a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the interpolator to when scrolling the view associated with this 733a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. 734a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 735a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param interpolator the interpolator to use, or null to use normal 1-to-1 scrolling. 736a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 73773e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollInterpolator 738a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollInterpolator() 739a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 740a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setScrollInterpolator(Interpolator interpolator) { 741a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = interpolator; 742a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 743a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 744a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 745a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the {@link Interpolator} being used for scrolling the view associated with this 746a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. Null indicates 'normal' 1-to-1 scrolling. 747a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 74873e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollInterpolator 749a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollInterpolator(Interpolator) 750a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 751a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Interpolator getScrollInterpolator() { 752a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollInterpolator; 753a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 7541a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 7551a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes /** 7561a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * Returns true if the scroll flags are compatible for 'collapsing' 7571a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes */ 758657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas boolean isCollapsible() { 7591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return (mScrollFlags & SCROLL_FLAG_SCROLL) == SCROLL_FLAG_SCROLL 7601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes && (mScrollFlags & COLLAPSIBLE_FLAGS) != 0; 7611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 762a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 763a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 764a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 765a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The default {@link Behavior} for {@link AppBarLayout}. Implements the necessary nested 766a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll handling with offsetting. 767a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 768ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class Behavior extends HeaderBehavior<AppBarLayout> { 76957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private static final int MAX_OFFSET_ANIMATION_DURATION = 600; // ms 770e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private static final int INVALID_POSITION = -1; 771e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 77272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 77372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Callback to allow control over any {@link AppBarLayout} dragging. 77472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 77572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public static abstract class DragCallback { 77672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 77772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Allows control over whether the given {@link AppBarLayout} can be dragged or not. 77872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 77972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * <p>Dragging is defined as a direct touch on the AppBarLayout with movement. This 78072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * call does not affect any nested scrolling.</p> 78172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 78272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * @return true if we are in a position to scroll the AppBarLayout via a drag, false 78372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * if not. 78472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 78572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public abstract boolean canDrag(@NonNull AppBarLayout appBarLayout); 78672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 78772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 788e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetDelta; 789a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 79050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes private boolean mSkipNestedPreScroll; 79147543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes private boolean mWasNestedFlung; 792631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 793ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikas private ValueAnimator mOffsetAnimator; 79450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 795e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetToChildIndexOnLayout = INVALID_POSITION; 796e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private boolean mOffsetToChildIndexOnLayoutIsMinHeight; 797e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private float mOffsetToChildIndexOnLayoutPerc; 798e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 799d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private WeakReference<View> mLastNestedScrollingChildRef; 80072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes private DragCallback mOnDragCallback; 801d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 802a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior() {} 803a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 804a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior(Context context, AttributeSet attrs) { 805a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 806a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 807a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 808a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 809ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes public boolean onStartNestedScroll(CoordinatorLayout parent, AppBarLayout child, 810a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View directTargetChild, View target, int nestedScrollAxes) { 811f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // Return true if we're nested scrolling vertically, and we have scrollable children 812f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // and the scrolling view is big enough to scroll 813631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final boolean started = (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0 814f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes && child.hasScrollableChildren() 815ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes && parent.getHeight() - directTargetChild.getHeight() <= child.getHeight(); 816631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 817c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (started && mOffsetAnimator != null) { 818631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Cancel any offset animation 819c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 820631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 821631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 822d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // A new nested scroll has started so clear out the previous ref 823d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = null; 824d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 825631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return started; 826a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 827a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 828a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 829a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 830a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dx, int dy, int[] consumed) { 83150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy != 0 && !mSkipNestedPreScroll) { 83250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int min, max; 83350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy < 0) { 83450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling down 83550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getTotalScrollRange(); 83650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = min + child.getDownNestedPreScrollRange(); 83750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 83850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling up 83950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getUpNestedPreScrollRange(); 84050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = 0; 84150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 84250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes consumed[1] = scroll(coordinatorLayout, child, dy, min, max); 843a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 844a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 845a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 846a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 847a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 848a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dxConsumed, int dyConsumed, 849a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int dxUnconsumed, int dyUnconsumed) { 85050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dyUnconsumed < 0) { 85150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If the scrolling view is scrolling down but not consuming, it's probably be at 85250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // the top of it's content 85350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes scroll(coordinatorLayout, child, dyUnconsumed, 85450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes -child.getDownNestedScrollRange(), 0); 85550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Set the expanding flag so that onNestedPreScroll doesn't handle any events 85650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = true; 85750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 85850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // As we're no longer handling nested scrolls, reset the skip flag 85950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 860a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 86150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 862a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 86350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Override 864bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout abl, 86550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes View target) { 86647543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes if (!mWasNestedFlung) { 867bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we haven't been flung then let's see if the current view has been set to snap 868bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes snapToChildIfNeeded(coordinatorLayout, abl); 869bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 870bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 871bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // Reset the flags 87250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 87347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes mWasNestedFlung = false; 874d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // Keep a reference to the previous nested scrolling child 875d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = new WeakReference<>(target); 876d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 877d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 878d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes @Override 879631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public boolean onNestedFling(final CoordinatorLayout coordinatorLayout, 880631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final AppBarLayout child, View target, float velocityX, float velocityY, 881631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes boolean consumed) { 882bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes boolean flung = false; 883bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 884631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (!consumed) { 885631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // It has been consumed so let's fling ourselves 886bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = fling(coordinatorLayout, child, -child.getTotalScrollRange(), 887bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 0, -velocityY); 888631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 889631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we're scrolling up and the child also consumed the fling. We'll fake scroll 890c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas // up to our 'collapsed' offset 891631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (velocityY < 0) { 892631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling down 893bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int targetScroll = -child.getTotalScrollRange() 894631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes + child.getDownNestedPreScrollRange(); 895bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (getTopBottomOffsetForScrollingSibling() < targetScroll) { 896bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we're currently not expanded more than the target scroll, we'll 897bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // animate a fling 89857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll, velocityY); 899bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = true; 900631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 901631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 902631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling up 903bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int targetScroll = -child.getUpNestedPreScrollRange(); 904bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (getTopBottomOffsetForScrollingSibling() > targetScroll) { 905bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we're currently not expanded less than the target scroll, we'll 906bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // animate a fling 90757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll, velocityY); 908bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = true; 909631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 910631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 911631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 912631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 91347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes mWasNestedFlung = flung; 914bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes return flung; 915631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 916631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 91772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 91872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Set a callback to control any {@link AppBarLayout} dragging. 91972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 92072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * @param callback the callback to use, or {@code null} to use the default behavior. 92172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 92272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public void setDragCallback(@Nullable DragCallback callback) { 92372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes mOnDragCallback = callback; 92472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 92572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 926631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private void animateOffsetTo(final CoordinatorLayout coordinatorLayout, 92757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final AppBarLayout child, final int offset, float velocity) { 92857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final int distance = Math.abs(getTopBottomOffsetForScrollingSibling() - offset); 92957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 93057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final int duration; 93157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes velocity = Math.abs(velocity); 93257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes if (velocity > 0) { 93357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes duration = 3 * Math.round(1000 * (distance / velocity)); 93457aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } else { 93557aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final float distanceRatio = (float) distance / child.getHeight(); 93657aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes duration = (int) ((distanceRatio + 1) * 150); 93757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } 93857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 93957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetWithDuration(coordinatorLayout, child, offset, duration); 94057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } 94157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 94257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private void animateOffsetWithDuration(final CoordinatorLayout coordinatorLayout, 94357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final AppBarLayout child, final int offset, final int duration) { 944dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes final int currentOffset = getTopBottomOffsetForScrollingSibling(); 945dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes if (currentOffset == offset) { 946c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (mOffsetAnimator != null && mOffsetAnimator.isRunning()) { 947c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 948dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 949dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes return; 950dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 951dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 952c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (mOffsetAnimator == null) { 953ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikas mOffsetAnimator = new ValueAnimator(); 954c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setInterpolator(AnimationUtils.DECELERATE_INTERPOLATOR); 955ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikas mOffsetAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 956631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 957ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikas public void onAnimationUpdate(ValueAnimator animation) { 958ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(coordinatorLayout, child, 959ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikas (int) animation.getAnimatedValue()); 960631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 961631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes }); 962631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 963c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 964631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 965631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 96657aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes mOffsetAnimator.setDuration(Math.min(duration, MAX_OFFSET_ANIMATION_DURATION)); 967c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setIntValues(currentOffset, offset); 968c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.start(); 969631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 970631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 971108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes private int getChildIndexOnOffset(AppBarLayout abl, final int offset) { 972bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes for (int i = 0, count = abl.getChildCount(); i < count; i++) { 973bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes View child = abl.getChildAt(i); 974bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (child.getTop() <= -offset && child.getBottom() >= -offset) { 975108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return i; 976bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 977bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 978108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return -1; 979bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 980bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 981bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes private void snapToChildIfNeeded(CoordinatorLayout coordinatorLayout, AppBarLayout abl) { 982bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int offset = getTopBottomOffsetForScrollingSibling(); 983108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int offsetChildIndex = getChildIndexOnOffset(abl, offset); 984108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offsetChildIndex >= 0) { 985108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final View offsetChild = abl.getChildAt(offsetChildIndex); 986bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final LayoutParams lp = (LayoutParams) offsetChild.getLayoutParams(); 987108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int flags = lp.getScrollFlags(); 988108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 989108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if ((flags & LayoutParams.FLAG_SNAP) == LayoutParams.FLAG_SNAP) { 990bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // We're set the snap, so animate the offset to the nearest edge 991108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes int snapTop = -offsetChild.getTop(); 992108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes int snapBottom = -offsetChild.getBottom(); 993108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 994108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offsetChildIndex == abl.getChildCount() - 1) { 995108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If this is the last child, we need to take the top inset into account 996108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom += abl.getTopInset(); 997108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 998dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 999108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (checkFlag(flags, LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED)) { 1000108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If the view is set only exit until it is collapsed, we'll abide by that 1001108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom += ViewCompat.getMinimumHeight(offsetChild); 1002108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } else if (checkFlag(flags, LayoutParams.FLAG_QUICK_RETURN 1003108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes | LayoutParams.SCROLL_FLAG_ENTER_ALWAYS)) { 1004108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If it's set to always enter collapsed, it actually has two states. We 1005108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // select the state and then snap within the state 1006108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int seam = snapBottom + ViewCompat.getMinimumHeight(offsetChild); 1007108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offset < seam) { 1008108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapTop = seam; 1009108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } else { 1010108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom = seam; 1011108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 1012dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 1013dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 1014108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int newOffset = offset < (snapBottom + snapTop) / 2 1015108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes ? snapBottom 1016108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes : snapTop; 1017bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes animateOffsetTo(coordinatorLayout, abl, 101857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes MathUtils.constrain(newOffset, -abl.getTotalScrollRange(), 0), 0); 1019bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 1020bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 1021bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 1022bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 1023108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes private static boolean checkFlag(final int flags, final int check) { 1024108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return (flags & check) == check; 1025108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 1026108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 1027631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 1028bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes public boolean onMeasureChild(CoordinatorLayout parent, AppBarLayout child, 1029bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, 1030bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes int heightUsed) { 1031bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes final CoordinatorLayout.LayoutParams lp = 1032bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes (CoordinatorLayout.LayoutParams) child.getLayoutParams(); 1033bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes if (lp.height == CoordinatorLayout.LayoutParams.WRAP_CONTENT) { 1034bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // If the view is set to wrap on it's height, CoordinatorLayout by default will 1035bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // cap the view at the CoL's height. Since the AppBarLayout can scroll, this isn't 1036bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // what we actually want, so we measure it ourselves with an unspecified spec to 1037bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // allow the child to be larger than it's parent 1038bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes parent.onMeasureChild(child, parentWidthMeasureSpec, widthUsed, 1039bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), heightUsed); 1040bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes return true; 1041bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes } 1042bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes 1043bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // Let the parent handle it as normal 1044bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes return super.onMeasureChild(parent, child, parentWidthMeasureSpec, widthUsed, 1045bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes parentHeightMeasureSpec, heightUsed); 1046bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes } 1047bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes 1048bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes @Override 10499995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public boolean onLayoutChild(CoordinatorLayout parent, AppBarLayout abl, 105050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int layoutDirection) { 10519995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes boolean handled = super.onLayoutChild(parent, abl, layoutDirection); 10529995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 10532bab57ed97f284a8152d180cca796739afa3a71dChris Banes // The priority for for actions here is (first which is true wins): 10542bab57ed97f284a8152d180cca796739afa3a71dChris Banes // 1. forced pending actions 10552bab57ed97f284a8152d180cca796739afa3a71dChris Banes // 2. offsets for restorations 10562bab57ed97f284a8152d180cca796739afa3a71dChris Banes // 3. non-forced pending actions 10579995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int pendingAction = abl.getPendingAction(); 10582bab57ed97f284a8152d180cca796739afa3a71dChris Banes if (mOffsetToChildIndexOnLayout >= 0 && (pendingAction & PENDING_ACTION_FORCE) == 0) { 10592bab57ed97f284a8152d180cca796739afa3a71dChris Banes View child = abl.getChildAt(mOffsetToChildIndexOnLayout); 10602bab57ed97f284a8152d180cca796739afa3a71dChris Banes int offset = -child.getBottom(); 10612bab57ed97f284a8152d180cca796739afa3a71dChris Banes if (mOffsetToChildIndexOnLayoutIsMinHeight) { 10622bab57ed97f284a8152d180cca796739afa3a71dChris Banes offset += ViewCompat.getMinimumHeight(child) + abl.getTopInset(); 10632bab57ed97f284a8152d180cca796739afa3a71dChris Banes } else { 10642bab57ed97f284a8152d180cca796739afa3a71dChris Banes offset += Math.round(child.getHeight() * mOffsetToChildIndexOnLayoutPerc); 10652bab57ed97f284a8152d180cca796739afa3a71dChris Banes } 10662bab57ed97f284a8152d180cca796739afa3a71dChris Banes setHeaderTopBottomOffset(parent, abl, offset); 10672bab57ed97f284a8152d180cca796739afa3a71dChris Banes } else if (pendingAction != PENDING_ACTION_NONE) { 10689995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final boolean animate = (pendingAction & PENDING_ACTION_ANIMATE_ENABLED) != 0; 10699995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if ((pendingAction & PENDING_ACTION_COLLAPSED) != 0) { 10709995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int offset = -abl.getUpNestedPreScrollRange(); 10719995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 107257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(parent, abl, offset, 0); 10739995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 1074ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, offset); 10759995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10769995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if ((pendingAction & PENDING_ACTION_EXPANDED) != 0) { 10779995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 107857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(parent, abl, 0, 0); 10799995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 1080ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, 0); 10819995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10829995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 1083e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 108450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 108579aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes // Finally reset any pending states 108679aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes abl.resetPendingAction(); 108779aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 108879aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes 108947543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // We may have changed size, so let's constrain the top and bottom offset correctly, 109047543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // just in case we're out of the bounds 109147543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes setTopAndBottomOffset( 109247543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes MathUtils.constrain(getTopAndBottomOffset(), -abl.getTotalScrollRange(), 0)); 109347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes 1094df2d45b76203a9c4101629005eb27059d7f80297Chris Banes // Update the AppBarLayout's drawable state for any elevation changes. 1095df2d45b76203a9c4101629005eb27059d7f80297Chris Banes // This is needed so that the elevation is set in the first layout, so that 1096df2d45b76203a9c4101629005eb27059d7f80297Chris Banes // we don't get a visual elevation jump pre-N (due to the draw dispatch skip) 1097df2d45b76203a9c4101629005eb27059d7f80297Chris Banes updateAppBarLayoutDrawableState(parent, abl, getTopAndBottomOffset(), 0, true); 1098df2d45b76203a9c4101629005eb27059d7f80297Chris Banes 10991a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Make sure we dispatch the offset update 11001a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes abl.dispatchOffsetUpdates(getTopAndBottomOffset()); 110150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 110250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return handled; 1103a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1104a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 110572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 110672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes boolean canDragView(AppBarLayout view) { 110772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes if (mOnDragCallback != null) { 110872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // If there is a drag callback set, it's in control 110972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return mOnDragCallback.canDrag(view); 111072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 111172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 111272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // Else we'll use the default behaviour of seeing if it can scroll down 1113d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mLastNestedScrollingChildRef != null) { 111472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // If we have a reference to a scrolling view, check it 111572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes final View scrollingView = mLastNestedScrollingChildRef.get(); 111672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return scrollingView != null && scrollingView.isShown() 111772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes && !ViewCompat.canScrollVertically(scrollingView, -1); 111872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } else { 111972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // Otherwise we assume that the scrolling view hasn't been scrolled and can drag. 112072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return true; 1121d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1122d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1123d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 1124ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 112547543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes void onFlingFinished(CoordinatorLayout parent, AppBarLayout layout) { 112647543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // At the end of a manual fling, check to see if we need to snap to the edge-child 112747543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes snapToChildIfNeeded(parent, layout); 112847543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes } 112947543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes 113047543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes @Override 113172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getMaxDragOffset(AppBarLayout view) { 113272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return -view.getDownNestedScrollRange(); 113372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 113472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 113572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 113672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getScrollRangeForDragFling(AppBarLayout view) { 113772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return view.getTotalScrollRange(); 113872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 113972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 114072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 114172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int setHeaderTopBottomOffset(CoordinatorLayout coordinatorLayout, 1142bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes AppBarLayout appBarLayout, int newOffset, int minOffset, int maxOffset) { 1143e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int curOffset = getTopBottomOffsetForScrollingSibling(); 1144a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int consumed = 0; 1145a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 11465e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes if (minOffset != 0 && curOffset >= minOffset && curOffset <= maxOffset) { 1147631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we have some scrolling range, and we're currently within the min and max 1148631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // offsets, calculate a new offset 114950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes newOffset = MathUtils.constrain(newOffset, minOffset, maxOffset); 1150a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (curOffset != newOffset) { 1151e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int interpolatedOffset = appBarLayout.hasChildWithInterpolator() 1152e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ? interpolateOffset(appBarLayout, newOffset) 1153e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes : newOffset; 1154e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 11551a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final boolean offsetChanged = setTopAndBottomOffset(interpolatedOffset); 1156631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 1157a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update how much dy we have consumed 1158a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes consumed = curOffset - newOffset; 1159a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update the stored sibling offset 1160e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetDelta = newOffset - interpolatedOffset; 1161a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1162a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (!offsetChanged && appBarLayout.hasChildWithInterpolator()) { 1163a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If the offset hasn't changed and we're using an interpolated scroll 1164a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // then we need to keep any dependent views updated. CoL will do this for 1165a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us when we move, but we need to do it manually when we don't (as an 1166a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // interpolated scroll may finish early). 1167a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes coordinatorLayout.dispatchDependentViewsChanged(appBarLayout); 1168a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1169a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1170631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Dispatch the updates to any listeners 11711a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes appBarLayout.dispatchOffsetUpdates(getTopAndBottomOffset()); 11721a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 11731a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Update the AppBarLayout's drawable state (for any elevation changes) 1174c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes updateAppBarLayoutDrawableState(coordinatorLayout, appBarLayout, newOffset, 1175df2d45b76203a9c4101629005eb27059d7f80297Chris Banes newOffset < curOffset ? -1 : 1, false); 1176a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 11775e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes } else { 11785e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // Reset the offset delta 11795e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes mOffsetDelta = 0; 1180a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1181a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1182a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return consumed; 1183a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1184a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1185bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes @VisibleForTesting 1186bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes boolean isOffsetAnimatorRunning() { 1187bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes return mOffsetAnimator != null && mOffsetAnimator.isRunning(); 1188bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes } 1189bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes 1190a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int interpolateOffset(AppBarLayout layout, final int offset) { 1191a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int absOffset = Math.abs(offset); 1192a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1193a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 1194a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = layout.getChildAt(i); 1195a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 119650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 1197a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 119850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 1199a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 120050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int childScrollableHeight = 0; 120150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int flags = childLp.getScrollFlags(); 120250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 1203b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // We're set to scroll so add the child's height plus margin 1204b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childScrollableHeight += child.getHeight() + childLp.topMargin 1205b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes + childLp.bottomMargin; 1206b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes 120750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 1208b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // For a collapsing scroll, we to take the collapsed height 1209b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // into account. 121050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes childScrollableHeight -= ViewCompat.getMinimumHeight(child); 121150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 121250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 121350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1214ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (ViewCompat.getFitsSystemWindows(child)) { 1215ea004a01f44aaf36212120c936952c1742d03d30Chris Banes childScrollableHeight -= layout.getTopInset(); 1216ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1217ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 121850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (childScrollableHeight > 0) { 121950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int offsetForView = absOffset - child.getTop(); 122050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int interpolatedDiff = Math.round(childScrollableHeight * 122150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes interpolator.getInterpolation( 122250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes offsetForView / (float) childScrollableHeight)); 122350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 122450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return Integer.signum(offset) * (child.getTop() + interpolatedDiff); 122550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 1226a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 122750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 122850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If we get to here then the view on the offset isn't suitable for interpolated 122950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // scrolling. So break out of the loop 123050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes break; 1231a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1232a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1233a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1234a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return offset; 1235a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1236a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1237c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes private void updateAppBarLayoutDrawableState(final CoordinatorLayout parent, 1238df2d45b76203a9c4101629005eb27059d7f80297Chris Banes final AppBarLayout layout, final int offset, final int direction, 1239df2d45b76203a9c4101629005eb27059d7f80297Chris Banes final boolean forceJump) { 12401a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final View child = getAppBarChildOnOffset(layout, offset); 12411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (child != null) { 12421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 12431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int flags = childLp.getScrollFlags(); 12441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes boolean collapsed = false; 12451a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12461a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 12471a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int minHeight = ViewCompat.getMinimumHeight(child); 12481a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12491a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (direction > 0 && (flags & (LayoutParams.SCROLL_FLAG_ENTER_ALWAYS 12501a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes | LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED)) != 0) { 12511a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // We're set to enter always collapsed so we are only collapsed when 12521a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // being scrolled down, and in a collapsed offset 12531a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes collapsed = -offset >= child.getBottom() - minHeight - layout.getTopInset(); 12541a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 12551a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // We're set to exit until collapsed, so any offset which results in 12561a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // the minimum height (or less) being shown is collapsed 12571a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes collapsed = -offset >= child.getBottom() - minHeight - layout.getTopInset(); 12581a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1261c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final boolean changed = layout.setCollapsedState(collapsed); 1262c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes 1263df2d45b76203a9c4101629005eb27059d7f80297Chris Banes if (Build.VERSION.SDK_INT >= 11 && (forceJump 1264df2d45b76203a9c4101629005eb27059d7f80297Chris Banes || (changed && shouldJumpElevationState(parent, layout)))) { 1265c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // If the collapsed state changed, we may need to 1266c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // jump to the current state if we have an overlapping view 1267c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes layout.jumpDrawablesToCurrentState(); 1268c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 1269c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 1270c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 1271c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes 1272c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes private boolean shouldJumpElevationState(CoordinatorLayout parent, AppBarLayout layout) { 1273c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // We should jump the elevated state if we have a dependent scrolling view which has 1274c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // an overlapping top (i.e. overlaps us) 1275c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final List<View> dependencies = parent.getDependents(layout); 1276c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes for (int i = 0, size = dependencies.size(); i < size; i++) { 1277c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final View dependency = dependencies.get(i); 1278c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final CoordinatorLayout.LayoutParams lp = 1279c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes (CoordinatorLayout.LayoutParams) dependency.getLayoutParams(); 1280c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final CoordinatorLayout.Behavior behavior = lp.getBehavior(); 1281c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes 1282c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes if (behavior instanceof ScrollingViewBehavior) { 1283c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return ((ScrollingViewBehavior) behavior).getOverlayTop() != 0; 1284c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 12851a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 1286c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return false; 12871a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12881a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12891a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private static View getAppBarChildOnOffset(final AppBarLayout layout, final int offset) { 12901a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int absOffset = Math.abs(offset); 12911a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 12921a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final View child = layout.getChildAt(i); 12931a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 12941a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return child; 12951a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12961a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12971a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return null; 12981a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12991a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1300ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 130172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getTopBottomOffsetForScrollingSibling() { 1302e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return getTopAndBottomOffset() + mOffsetDelta; 1303e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1304e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1305e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1306824644fc70d5fd36bcd4c1e155c1279aebcac007Chris Banes public Parcelable onSaveInstanceState(CoordinatorLayout parent, AppBarLayout abl) { 1307824644fc70d5fd36bcd4c1e155c1279aebcac007Chris Banes final Parcelable superState = super.onSaveInstanceState(parent, abl); 1308e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int offset = getTopAndBottomOffset(); 1309e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1310e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Try and find the first visible child... 1311824644fc70d5fd36bcd4c1e155c1279aebcac007Chris Banes for (int i = 0, count = abl.getChildCount(); i < count; i++) { 1312824644fc70d5fd36bcd4c1e155c1279aebcac007Chris Banes View child = abl.getChildAt(i); 1313e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int visBottom = child.getBottom() + offset; 1314e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1315e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (child.getTop() + offset <= 0 && visBottom >= 0) { 1316e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = new SavedState(superState); 1317e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibleChildIndex = i; 1318c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas ss.firstVisibleChildAtMinimumHeight = 1319824644fc70d5fd36bcd4c1e155c1279aebcac007Chris Banes visBottom == (ViewCompat.getMinimumHeight(child) + abl.getTopInset()); 1320c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas ss.firstVisibleChildPercentageShown = visBottom / (float) child.getHeight(); 1321e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return ss; 1322e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1323e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1324e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1325e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Else we'll just return the super state 1326e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return superState; 1327e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1328e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1329e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1330e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void onRestoreInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout, 1331e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes Parcelable state) { 1332e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (state instanceof SavedState) { 1333e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = (SavedState) state; 1334e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, ss.getSuperState()); 1335e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = ss.firstVisibleChildIndex; 1336c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas mOffsetToChildIndexOnLayoutPerc = ss.firstVisibleChildPercentageShown; 1337c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas mOffsetToChildIndexOnLayoutIsMinHeight = ss.firstVisibleChildAtMinimumHeight; 1338e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 1339e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, state); 1340e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 1341e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1342e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1343e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 134405f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banes protected static class SavedState extends AbsSavedState { 1345e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int firstVisibleChildIndex; 1346c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas float firstVisibleChildPercentageShown; 1347c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas boolean firstVisibleChildAtMinimumHeight; 1348e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 134962ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes public SavedState(Parcel source, ClassLoader loader) { 135005f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banes super(source, loader); 1351e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibleChildIndex = source.readInt(); 1352c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas firstVisibleChildPercentageShown = source.readFloat(); 1353c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas firstVisibleChildAtMinimumHeight = source.readByte() != 0; 1354e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1355e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1356e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState(Parcelable superState) { 1357e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super(superState); 1358e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1359e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1360e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1361e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void writeToParcel(Parcel dest, int flags) { 1362e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.writeToParcel(dest, flags); 1363e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeInt(firstVisibleChildIndex); 1364c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas dest.writeFloat(firstVisibleChildPercentageShown); 1365c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas dest.writeByte((byte) (firstVisibleChildAtMinimumHeight ? 1 : 0)); 1366e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1367e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 13684b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas public static final Creator<SavedState> CREATOR = new ClassLoaderCreator<SavedState>() { 13694b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas @Override 13704b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas public SavedState createFromParcel(Parcel source, ClassLoader loader) { 13714b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas return new SavedState(source, loader); 13724b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas } 1373e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 13744b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas @Override 13754b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas public SavedState createFromParcel(Parcel source) { 13764b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas return new SavedState(source, null); 13774b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas } 13784b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas 13794b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas @Override 13804b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas public SavedState[] newArray(int size) { 13814b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas return new SavedState[size]; 13824b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas } 13834b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas }; 1384a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1385a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1386a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1387a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1388a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Behavior which should be used by {@link View}s which can scroll vertically and support 1389a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * nested scrolling to automatically scroll any {@link AppBarLayout} siblings. 1390a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1391ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class ScrollingViewBehavior extends HeaderScrollingViewBehavior { 1392a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1393a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior() {} 1394a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1395a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior(Context context, AttributeSet attrs) { 1396a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 1397a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1398b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final TypedArray a = context.obtainStyledAttributes(attrs, 139973e7a06fb66110495fa4e98a91831a47feab2526Chris Banes R.styleable.ScrollingViewBehavior_Layout); 1400b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes setOverlayTop(a.getDimensionPixelSize( 140173e7a06fb66110495fa4e98a91831a47feab2526Chris Banes R.styleable.ScrollingViewBehavior_Layout_behavior_overlapTop, 0)); 1402a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 1403a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1404a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1405a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1406a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) { 1407a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We depend on any AppBarLayouts 1408a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return dependency instanceof AppBarLayout; 1409a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1410a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1411a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1412a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean onDependentViewChanged(CoordinatorLayout parent, View child, 1413a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View dependency) { 14145e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes offsetChildAsNeeded(parent, child, dependency); 14150d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return false; 14160d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 14170d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 141800a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes @Override 14194cf1d92509224fab3ca69b419a005c536ab75c5cChris Banes public boolean onRequestChildRectangleOnScreen(CoordinatorLayout parent, View child, 142000a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes Rect rectangle, boolean immediate) { 142100a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes final AppBarLayout header = findFirstDependency(parent.getDependencies(child)); 142200a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes if (header != null) { 142300a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes // Offset the rect by the child's left/top 142400a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes rectangle.offset(child.getLeft(), child.getTop()); 142500a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes 142600a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes final Rect parentRect = mTempRect1; 142700a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes parentRect.set(0, 0, parent.getWidth(), parent.getHeight()); 142800a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes 142900a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes if (!parentRect.contains(rectangle)) { 143000a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes // If the rectangle can not be fully seen the visible bounds, collapse 143100a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes // the AppBarLayout 143200a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes header.setExpanded(false, !immediate); 143300a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes return true; 143400a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes } 143500a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes } 143600a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes return false; 143700a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes } 143800a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes 14395e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes private void offsetChildAsNeeded(CoordinatorLayout parent, View child, View dependency) { 1440a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final CoordinatorLayout.Behavior behavior = 1441a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes ((CoordinatorLayout.LayoutParams) dependency.getLayoutParams()).getBehavior(); 1442a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (behavior instanceof Behavior) { 14435e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // Offset the child, pinning it to the bottom the header-dependency, maintaining 1444bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes // any vertical gap and overlap 14455e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes final Behavior ablBehavior = (Behavior) behavior; 1446318baf84dade07174d71e10322e3b10ab4b0c28cChris Banes ViewCompat.offsetTopAndBottom(child, (dependency.getBottom() - child.getTop()) 14475e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes + ablBehavior.mOffsetDelta 14485e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes + getVerticalLayoutGap() 1449b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes - getOverlapPixelsForOffset(dependency)); 1450ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1451ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1452ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 1453b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes @Override 1454b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes float getOverlapRatioForOffset(final View header) { 1455b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes if (header instanceof AppBarLayout) { 1456b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final AppBarLayout abl = (AppBarLayout) header; 1457ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int totalScrollRange = abl.getTotalScrollRange(); 1458ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int preScrollDown = abl.getDownNestedPreScrollRange(); 1459b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final int offset = getAppBarLayoutOffset(abl); 1460a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1461ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (preScrollDown != 0 && (totalScrollRange + offset) <= preScrollDown) { 1462ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // If we're in a pre-scroll down. Don't use the offset at all. 1463ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return 0; 1464a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 1465ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int availScrollRange = totalScrollRange - preScrollDown; 1466dfb857dd12b359c0bdae11a23e039f286d54dc0aChris Banes if (availScrollRange != 0) { 1467ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Else we'll use a interpolated ratio of the overlap, depending on offset 1468b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 1f + (offset / (float) availScrollRange); 1469ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1470a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1471a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1472b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 0f; 1473a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1474a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1475b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes private static int getAppBarLayoutOffset(AppBarLayout abl) { 1476b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final CoordinatorLayout.Behavior behavior = 1477b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes ((CoordinatorLayout.LayoutParams) abl.getLayoutParams()).getBehavior(); 1478b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes if (behavior instanceof Behavior) { 1479b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return ((Behavior) behavior).getTopBottomOffsetForScrollingSibling(); 1480b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes } 1481b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 0; 1482a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1483a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1484ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 148500a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes AppBarLayout findFirstDependency(List<View> views) { 1486a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = views.size(); i < z; i++) { 1487a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View view = views.get(i); 1488a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (view instanceof AppBarLayout) { 148900a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes return (AppBarLayout) view; 1490a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1491a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1492a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return null; 1493a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1494ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor 1495ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 149672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getScrollRange(View v) { 1497ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor if (v instanceof AppBarLayout) { 1498ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return ((AppBarLayout) v).getTotalScrollRange(); 1499ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } else { 1500ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return super.getScrollRange(v); 1501ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1502ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1503a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1504a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes} 1505