AppBarLayout.java revision 47082c30c630c34829439a9eecd1cf7e8d255a86
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 19a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.content.Context; 20a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.content.res.TypedArray; 2100a00a7d3ba8279294f63994473afc32e05dcf10Chris Banesimport android.graphics.Rect; 221a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banesimport android.os.Build; 23e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banesimport android.os.Parcel; 24e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banesimport android.os.Parcelable; 2550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport android.support.annotation.IntDef; 2672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banesimport android.support.annotation.NonNull; 2772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banesimport android.support.annotation.Nullable; 2813633353237d6506f4c436b459bc8be8c3d7ed68Chris Banesimport android.support.annotation.VisibleForTesting; 29a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.support.design.R; 3062ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banesimport android.support.v4.os.ParcelableCompat; 3162ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banesimport android.support.v4.os.ParcelableCompatCreatorCallbacks; 3205f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banesimport android.support.v4.view.AbsSavedState; 33a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.support.v4.view.ViewCompat; 346ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banesimport android.support.v4.view.WindowInsetsCompat; 35a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.util.AttributeSet; 36a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.View; 37a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.ViewGroup; 38a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.animation.Interpolator; 39a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.widget.LinearLayout; 40a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 4150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.Retention; 4250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.RetentionPolicy; 43d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport java.lang.ref.WeakReference; 44631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banesimport java.util.ArrayList; 45a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport java.util.List; 46a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 4719a80415a88ecfae6bbc645cd14b653ed4337648Chris Banesimport static android.support.design.widget.ViewUtils.objectEquals; 4819a80415a88ecfae6bbc645cd14b653ed4337648Chris Banes 49a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes/** 50a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * AppBarLayout is a vertical {@link LinearLayout} which implements many of the features of 519fb154338a62edc2c57dc036895199d6f1769400Chris Banes * material designs app bar concept, namely scrolling gestures. 52a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 53a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Children should provide their desired scrolling behavior through 54a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams#setScrollFlags(int)} and the associated layout xml attribute: 55a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@code app:layout_scrollFlags}. 56a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 57a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 58a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * This view depends heavily on being used as a direct child within a {@link CoordinatorLayout}. 59a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * If you use AppBarLayout within a different {@link ViewGroup}, most of it's functionality will 60a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * not work. 61a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 629fb154338a62edc2c57dc036895199d6f1769400Chris Banes * AppBarLayout also requires a separate scrolling sibling in order to know when to scroll. 639fb154338a62edc2c57dc036895199d6f1769400Chris Banes * The binding is done through the {@link ScrollingViewBehavior} behavior class, meaning that you 649fb154338a62edc2c57dc036895199d6f1769400Chris Banes * should set your scrolling view's behavior to be an instance of {@link ScrollingViewBehavior}. 659fb154338a62edc2c57dc036895199d6f1769400Chris Banes * A string resource containing the full class name is available. 66a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 67a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <pre> 68a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.CoordinatorLayout 69a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:android="http://schemas.android.com/apk/res/android" 70a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:app="http://schemas.android.com/apk/res-auto" 71a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 72a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent"> 73a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 74a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v4.widget.NestedScrollView 75a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 76a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent" 77a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_behavior="@string/appbar_scrolling_view_behavior"> 78a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 79a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <!-- Your scrolling content --> 80a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 81a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.v4.widget.NestedScrollView> 82a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 83a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.AppBarLayout 84a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="wrap_content" 85a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent"> 86a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 87a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v7.widget.Toolbar 88a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 89a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 90a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 91a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.TabLayout 92a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 93a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 94a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 95a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.AppBarLayout> 96a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 97a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.CoordinatorLayout> 98a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </pre> 99a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 100a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see <a href="http://www.google.com/design/spec/layout/structure.html#structure-app-bar"> 101a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * http://www.google.com/design/spec/layout/structure.html#structure-app-bar</a> 102a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 103a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes@CoordinatorLayout.DefaultBehavior(AppBarLayout.Behavior.class) 104a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banespublic class AppBarLayout extends LinearLayout { 105a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1069995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_NONE = 0x0; 1079995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_EXPANDED = 0x1; 1089995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_COLLAPSED = 0x2; 1099995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_ANIMATE_ENABLED = 0x4; 1109995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 111a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 112631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Interface definition for a callback to be invoked when an {@link AppBarLayout}'s vertical 113631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * offset changes. 114a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 115631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public interface OnOffsetChangedListener { 116a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 117a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Called when the {@link AppBarLayout}'s layout offset has been changed. This allows 118a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * child views to implement custom behavior based on the offset (for instance pinning a 119a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * view at a certain y value). 120a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 121631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param appBarLayout the {@link AppBarLayout} which offset has changed 12250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes * @param verticalOffset the vertical offset for the parent {@link AppBarLayout}, in px 123a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 124631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset); 125a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 126a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 127a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private static final int INVALID_SCROLL_RANGE = -1; 128a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 129a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mTotalScrollRange = INVALID_SCROLL_RANGE; 130a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownPreScrollRange = INVALID_SCROLL_RANGE; 131a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownScrollRange = INVALID_SCROLL_RANGE; 132a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1331a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mHaveChildWithInterpolator; 13450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1359995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private int mPendingAction = PENDING_ACTION_NONE; 1369995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 1376ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes private WindowInsetsCompat mLastInsets; 1386ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 1391a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private List<OnOffsetChangedListener> mListeners; 1401a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mCollapsible; 1421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mCollapsed; 1431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private final int[] mTmpStatesArray = new int[2]; 145631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 146a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context) { 147a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes this(context, null); 148a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 149a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 150a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context, AttributeSet attrs) { 151a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 152a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes setOrientation(VERTICAL); 15350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 154809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes ThemeUtils.checkAppCompatTheme(context); 155809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes 1561a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21) { 1571a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Use the bounds view outline provider so that we cast a shadow, even without a 1581a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // background 1591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setBoundsViewOutlineProvider(this); 1601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // If we're running on API 21+, we should reset any state list animator from our 1621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // default style 1631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setStateListAnimatorFromAttrs(this, attrs, 0, 1641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes R.style.Widget_Design_AppBarLayout); 1651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 1661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1671a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AppBarLayout, 16850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 0, R.style.Widget_Design_AppBarLayout); 16947082c30c630c34829439a9eecd1cf7e8d255a86Aurimas Liutikas ViewCompat.setBackground(this, a.getDrawable(R.styleable.AppBarLayout_android_background)); 1709995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (a.hasValue(R.styleable.AppBarLayout_expanded)) { 1719995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(a.getBoolean(R.styleable.AppBarLayout_expanded, false)); 1729995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 1731a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21 && a.hasValue(R.styleable.AppBarLayout_elevation)) { 1741a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setDefaultAppBarLayoutStateListAnimator( 1751a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes this, a.getDimensionPixelSize(R.styleable.AppBarLayout_elevation, 0)); 1761a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 17750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes a.recycle(); 17850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1796ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes ViewCompat.setOnApplyWindowInsetsListener(this, 1806ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes new android.support.v4.view.OnApplyWindowInsetsListener() { 1816ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes @Override 1826ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public WindowInsetsCompat onApplyWindowInsets(View v, 1836ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes WindowInsetsCompat insets) { 1848818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes return onWindowInsetChanged(insets); 1856ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 1866ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes }); 187631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 188631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 189631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 190631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Add a listener that will be called when the offset of this {@link AppBarLayout} changes. 191631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 192631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener The listener that will be called when the offset changes.] 193631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 194631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @see #removeOnOffsetChangedListener(OnOffsetChangedListener) 195631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 196631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void addOnOffsetChangedListener(OnOffsetChangedListener listener) { 1971a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners == null) { 1981a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mListeners = new ArrayList<>(); 1991a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2006f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes if (listener != null && !mListeners.contains(listener)) { 2016f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.add(listener); 202631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 203631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 204631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 205631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 206631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Remove the previously added {@link OnOffsetChangedListener}. 207631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 208631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener the listener to remove. 209631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 210631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void removeOnOffsetChangedListener(OnOffsetChangedListener listener) { 2111a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners != null && listener != null) { 2126f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.remove(listener); 213631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 214a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 215a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 216a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 217ea004a01f44aaf36212120c936952c1742d03d30Chris Banes protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 218ea004a01f44aaf36212120c936952c1742d03d30Chris Banes super.onMeasure(widthMeasureSpec, heightMeasureSpec); 219ea004a01f44aaf36212120c936952c1742d03d30Chris Banes invalidateScrollRanges(); 220ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 221ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 222ea004a01f44aaf36212120c936952c1742d03d30Chris Banes @Override 223a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected void onLayout(boolean changed, int l, int t, int r, int b) { 224a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.onLayout(changed, l, t, r, b); 22579aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes invalidateScrollRanges(); 226a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 227a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = false; 228a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 229a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 230a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 231a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 232a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 233a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 234a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = true; 235a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 236a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 237a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 2381a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 2391a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes updateCollapsible(); 2401a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 2421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private void updateCollapsible() { 2431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes boolean haveCollapsibleChild = false; 2441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 2451a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (((LayoutParams) getChildAt(i).getLayoutParams()).isCollapsible()) { 2461a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes haveCollapsibleChild = true; 2471a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes break; 2481a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2491a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 25057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes setCollapsibleState(haveCollapsibleChild); 251a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 252a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 253ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void invalidateScrollRanges() { 254ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Invalidate the scroll ranges 255ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mTotalScrollRange = INVALID_SCROLL_RANGE; 256ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownPreScrollRange = INVALID_SCROLL_RANGE; 257ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownScrollRange = INVALID_SCROLL_RANGE; 258ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 259ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 260a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 261a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setOrientation(int orientation) { 262a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (orientation != VERTICAL) { 263a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes throw new IllegalArgumentException("AppBarLayout is always vertical and does" 264a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes + " not support horizontal orientation"); 265a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 266a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.setOrientation(orientation); 267a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 268a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 2699995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2709995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not, animating if it has already 2719995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * been laid out. 2729995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2739995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2749995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2759995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2769995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2779995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2789995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2799995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2809995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2819995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded) { 2829995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(expanded, ViewCompat.isLaidOut(this)); 2839995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 2849995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 2859995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2869995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not. 2879995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2889995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2899995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2909995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2919995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2929995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2939995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param animate Whether to animate to the new state 2949995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2959995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2969995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2979995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded, boolean animate) { 2989995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = (expanded ? PENDING_ACTION_EXPANDED : PENDING_ACTION_COLLAPSED) 2999995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes | (animate ? PENDING_ACTION_ANIMATE_ENABLED : 0); 3009995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes requestLayout(); 3019995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 3029995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 303a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 304a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 305a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return p instanceof LayoutParams; 306a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 307a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 308a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 309a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateDefaultLayoutParams() { 310a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 311a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 312a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 313a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 314a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams generateLayoutParams(AttributeSet attrs) { 315a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(getContext(), attrs); 316a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 317a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 318a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 319a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 320a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (p instanceof LinearLayout.LayoutParams) { 321a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((LinearLayout.LayoutParams) p); 322a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (p instanceof MarginLayoutParams) { 323a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((MarginLayoutParams) p); 324a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 325a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(p); 326a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 327a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 328ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private boolean hasChildWithInterpolator() { 329a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mHaveChildWithInterpolator; 330a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 331a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 332a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 3336ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes * Returns the scroll range of all children. 334a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 335a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @return the scroll range in px 336a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 3376ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public final int getTotalScrollRange() { 338a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mTotalScrollRange != INVALID_SCROLL_RANGE) { 339a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mTotalScrollRange; 340a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 341a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 342a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 343a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 344a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 345a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 346ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 347a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 348a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 349a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 350a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 351b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += childHeight + lp.topMargin + lp.bottomMargin; 352a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 353a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 354a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing scroll, we to take the collapsed height into account. 3556ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // We also break straight away since later views can't scroll beneath 356a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us 3576ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes range -= ViewCompat.getMinimumHeight(child); 3586ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes break; 359a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 360a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 361a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 362a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 363a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 364a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 365a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 3664832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes return mTotalScrollRange = Math.max(0, range - getTopInset()); 367a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 368a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 369ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private boolean hasScrollableChildren() { 370a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return getTotalScrollRange() != 0; 371a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 372a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 373a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 374a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling up from a nested pre-scroll. 375a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 376ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getUpNestedPreScrollRange() { 37750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return getTotalScrollRange(); 378a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 379a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 380a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 381a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested pre-scroll. 382a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 383ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getDownNestedPreScrollRange() { 384a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownPreScrollRange != INVALID_SCROLL_RANGE) { 385a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 386a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownPreScrollRange; 387a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 388a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 389a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 390a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = getChildCount() - 1; i >= 0; i--) { 391a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 392a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 393ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 394a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 395a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 396a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.FLAG_QUICK_RETURN) == LayoutParams.FLAG_QUICK_RETURN) { 397b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // First take the margin into account 398b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += lp.topMargin + lp.bottomMargin; 399a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // The view has the quick return flag combination... 400a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED) != 0) { 401a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If they're set to enter collapsed, use the minimum height 402a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += ViewCompat.getMinimumHeight(child); 40347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes } else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 40447543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // Only enter by the amount of the collapsed height 40547543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes range += childHeight - ViewCompat.getMinimumHeight(child); 406a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 407a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Else use the full height 408a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 409a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 410a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (range > 0) { 411a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we've hit an non-quick return scrollable view, and we've already hit a 412a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // quick return view, return now 413a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 414a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 415a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 41613633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes return mDownPreScrollRange = Math.max(0, range); 417a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 418a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 419a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 420a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested scroll. 421a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 422ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getDownNestedScrollRange() { 423a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownScrollRange != INVALID_SCROLL_RANGE) { 424a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 425a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownScrollRange; 426a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 427a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 428a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 429c1ce4f6cf4d99d6856c4259bf1bb1cb56f604737Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 430a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 431a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 432ea004a01f44aaf36212120c936952c1742d03d30Chris Banes int childHeight = child.getMeasuredHeight(); 433b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childHeight += lp.topMargin + lp.bottomMargin; 434a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 435a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 436a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 437a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 438a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 439a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 440a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 441a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 442a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing exit scroll, we to take the collapsed height into account. 4434832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes // We also break the range straight away since later views can't scroll 444a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // beneath us 4454832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes range -= ViewCompat.getMinimumHeight(child) + getTopInset(); 4464832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes break; 447a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 448a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 449a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 450a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 451a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 452a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 453a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 4544c33be829067714342b629d29329206bc2116afeChris Banes return mDownScrollRange = Math.max(0, range); 455a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 456a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 4571a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private void dispatchOffsetUpdates(int offset) { 4581a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Iterate backwards through the list so that most recently added listeners 4591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // get the first chance to decide 4601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners != null) { 4611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = mListeners.size(); i < z; i++) { 4621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final OnOffsetChangedListener listener = mListeners.get(i); 4631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (listener != null) { 4641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes listener.onOffsetChanged(this, offset); 4651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4671a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4681a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4691a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 47050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int getMinimumHeightForVisibleOverlappingContent() { 47117ed3263761329f6aa6796941358c41001fff325Chris Banes final int topInset = getTopInset(); 47250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int minHeight = ViewCompat.getMinimumHeight(this); 47350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (minHeight != 0) { 47450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If this layout has a min height, use it (doubled) 4756ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes return (minHeight * 2) + topInset; 47650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 47750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 47850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Otherwise, we'll use twice the min height of our last child 47950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int childCount = getChildCount(); 480b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes final int lastChildMinHeight = childCount >= 1 481b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes ? ViewCompat.getMinimumHeight(getChildAt(childCount - 1)) : 0; 482b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes if (lastChildMinHeight != 0) { 483b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes return (lastChildMinHeight * 2) + topInset; 484b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes } 485b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes 486b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes // If we reach here then we don't have a min height explicitly set. Instead we'll take a 487b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes // guess at 1/3 of our height being visible 488b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes return getHeight() / 3; 48950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 49050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 4911a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Override 4921a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes protected int[] onCreateDrawableState(int extraSpace) { 4931a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int[] extraStates = mTmpStatesArray; 4941a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int[] states = super.onCreateDrawableState(extraSpace + extraStates.length); 4951a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 4961a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes extraStates[0] = mCollapsible ? R.attr.state_collapsible : -R.attr.state_collapsible; 4971a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes extraStates[1] = mCollapsible && mCollapsed 4981a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ? R.attr.state_collapsed : -R.attr.state_collapsed; 4991a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 5001a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return mergeDrawableStates(states, extraStates); 5011a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5021a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 503c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes /** 504c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * Sets whether the AppBarLayout has collapsible children or not. 505c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * 506c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * @return true if the collapsible state changed 507c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes */ 508c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes private boolean setCollapsibleState(boolean collapsible) { 5091a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mCollapsible != collapsible) { 5101a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mCollapsible = collapsible; 5111a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes refreshDrawableState(); 512c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return true; 5131a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 514c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return false; 5151a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5161a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 517c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes /** 518c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * Sets whether the AppBarLayout is in a collapsed state or not. 519c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * 520c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * @return true if the collapsed state changed 521c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes */ 522c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes private boolean setCollapsedState(boolean collapsed) { 5231a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mCollapsed != collapsed) { 5241a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mCollapsed = collapsed; 5251a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes refreshDrawableState(); 526c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return true; 5271a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 528c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return false; 5291a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 53150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** 5321a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @deprecated target elevation is now deprecated. AppBarLayout's elevation is now 533926cd28257536b1206934d69585a2dab100147d5Chris Banes * controlled via a {@link android.animation.StateListAnimator}. If a target 534c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas * elevation is set, either by this method or the {@code app:elevation} attribute, 535926cd28257536b1206934d69585a2dab100147d5Chris Banes * a new state list animator is created which uses the given {@code elevation} value. 536631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 5371a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_elevation 53850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes */ 5391a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Deprecated 540631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void setTargetElevation(float elevation) { 5411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21) { 5421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setDefaultAppBarLayoutStateListAnimator(this, elevation); 5431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 544631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 545631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 546631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 5471a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @deprecated target elevation is now deprecated. AppBarLayout's elevation is now 548926cd28257536b1206934d69585a2dab100147d5Chris Banes * controlled via a {@link android.animation.StateListAnimator}. This method now 549926cd28257536b1206934d69585a2dab100147d5Chris Banes * always returns 0. 550631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 5511a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Deprecated 552631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public float getTargetElevation() { 5531a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return 0; 55450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 55550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 556ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getPendingAction() { 5579995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes return mPendingAction; 5589995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 5599995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 560ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void resetPendingAction() { 5619995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = PENDING_ACTION_NONE; 5629995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 5639995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 56413633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes @VisibleForTesting 56513633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes final int getTopInset() { 566ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0; 567ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 568ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 5698818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes private WindowInsetsCompat onWindowInsetChanged(final WindowInsetsCompat insets) { 5708818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes WindowInsetsCompat newInsets = null; 5718818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 5728818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes if (ViewCompat.getFitsSystemWindows(this)) { 5738818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes // If we're set to fit system windows, keep the insets 5748818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes newInsets = insets; 5758818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes } 5768818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 5778818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes // If our insets have changed, keep them and invalidate the scroll ranges... 57819a80415a88ecfae6bbc645cd14b653ed4337648Chris Banes if (!objectEquals(mLastInsets, newInsets)) { 5798818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes mLastInsets = newInsets; 5808818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes invalidateScrollRanges(); 5818818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes } 5828818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 58317ed3263761329f6aa6796941358c41001fff325Chris Banes return insets; 5846ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 5856ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 586a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static class LayoutParams extends LinearLayout.LayoutParams { 58750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 58850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** @hide */ 58950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @IntDef(flag=true, value={ 59050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_SCROLL, 59150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_EXIT_UNTIL_COLLAPSED, 59250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_ENTER_ALWAYS, 593bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED, 594bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_SNAP 59550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes }) 59650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Retention(RetentionPolicy.SOURCE) 59750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public @interface ScrollFlags {} 59850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 599a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 600a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The view will be scroll in direct relation to scroll events. This flag needs to be 601a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * set for any of the other flags to take effect. If any sibling views 602a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * before this one do not have this flag, then this value has no effect. 603a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 604a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_SCROLL = 0x1; 605a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 606a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 607a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When exiting (scrolling off screen) the view will be scrolled until it is 608a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 'collapsed'. The collapsed height is defined by the view's minimum height. 609a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 610a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 611a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 612a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 613a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_EXIT_UNTIL_COLLAPSED = 0x2; 614a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 615a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 616a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When entering (scrolling on screen) the view will scroll on any downwards 617a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll event, regardless of whether the scrolling view is also scrolling. This 618a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * is commonly referred to as the 'quick return' pattern. 619a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 620a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS = 0x4; 621a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 622a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 623a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * An additional flag for 'enterAlways' which modifies the returning view to 624a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * only initially scroll back to it's collapsed height. Once the scrolling view has 625a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * reached the end of it's scroll range, the remainder of this view will be scrolled 626a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * into view. The collapsed height is defined by the view's minimum height. 627a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 628a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 629a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 630a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 631a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED = 0x8; 632a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 633a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 634bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Upon a scroll ending, if the view is only partially visible then it will be snapped 635bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * and scrolled to it's closest edge. For example, if the view only has it's bottom 25% 636bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * displayed, it will be scrolled off screen completely. Conversely, if it's bottom 75% 637bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * is visible then it will be scrolled fully into view. 638bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes */ 639bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public static final int SCROLL_FLAG_SNAP = 0x10; 640bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 641bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes /** 642bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Internal flags which allows quick checking features 643a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 644a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes static final int FLAG_QUICK_RETURN = SCROLL_FLAG_SCROLL | SCROLL_FLAG_ENTER_ALWAYS; 645bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes static final int FLAG_SNAP = SCROLL_FLAG_SCROLL | SCROLL_FLAG_SNAP; 6461a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes static final int COLLAPSIBLE_FLAGS = SCROLL_FLAG_EXIT_UNTIL_COLLAPSED 6471a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes | SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED; 648a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 649a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int mScrollFlags = SCROLL_FLAG_SCROLL; 650a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes Interpolator mScrollInterpolator; 651a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 652a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(Context c, AttributeSet attrs) { 653a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(c, attrs); 654c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.AppBarLayout_Layout); 655c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes mScrollFlags = a.getInt(R.styleable.AppBarLayout_Layout_layout_scrollFlags, 0); 656c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes if (a.hasValue(R.styleable.AppBarLayout_Layout_layout_scrollInterpolator)) { 657a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int resId = a.getResourceId( 658c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes R.styleable.AppBarLayout_Layout_layout_scrollInterpolator, 0); 659a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = android.view.animation.AnimationUtils.loadInterpolator( 660a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes c, resId); 661a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 662a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 663a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 664a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 665a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height) { 666a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height); 667a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 668a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 669a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height, float weight) { 670a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height, weight); 671a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 672a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 673a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(ViewGroup.LayoutParams p) { 674a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(p); 675a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 676a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 677a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(MarginLayoutParams source) { 678a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 679a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 680a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 681a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LinearLayout.LayoutParams source) { 682a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 683a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 684a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 685a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LayoutParams source) { 686a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 687a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = source.mScrollFlags; 688a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = source.mScrollInterpolator; 689a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 690a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 691a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 692a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the scrolling flags. 693a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 694a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param flags bitwise int of {@link #SCROLL_FLAG_SCROLL}, 695bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_EXIT_UNTIL_COLLAPSED}, {@link #SCROLL_FLAG_ENTER_ALWAYS}, 696bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED} and {@link #SCROLL_FLAG_SNAP }. 697a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 698a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollFlags() 699a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 70073e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollFlags 701a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 70250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public void setScrollFlags(@ScrollFlags int flags) { 703a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = flags; 704a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 705a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 706a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 707a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the scrolling flags. 708a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 709a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollFlags(int) 710a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 71173e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollFlags 712a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 71350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @ScrollFlags 714a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public int getScrollFlags() { 715a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollFlags; 716a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 717a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 718a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 719a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the interpolator to when scrolling the view associated with this 720a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. 721a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 722a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param interpolator the interpolator to use, or null to use normal 1-to-1 scrolling. 723a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 72473e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollInterpolator 725a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollInterpolator() 726a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 727a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setScrollInterpolator(Interpolator interpolator) { 728a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = interpolator; 729a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 730a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 731a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 732a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the {@link Interpolator} being used for scrolling the view associated with this 733a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. Null indicates 'normal' 1-to-1 scrolling. 734a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 73573e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollInterpolator 736a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollInterpolator(Interpolator) 737a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 738a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Interpolator getScrollInterpolator() { 739a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollInterpolator; 740a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 7411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 7421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes /** 7431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * Returns true if the scroll flags are compatible for 'collapsing' 7441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes */ 7451a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean isCollapsible() { 7461a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return (mScrollFlags & SCROLL_FLAG_SCROLL) == SCROLL_FLAG_SCROLL 7471a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes && (mScrollFlags & COLLAPSIBLE_FLAGS) != 0; 7481a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 749a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 750a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 751a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 752a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The default {@link Behavior} for {@link AppBarLayout}. Implements the necessary nested 753a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll handling with offsetting. 754a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 755ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class Behavior extends HeaderBehavior<AppBarLayout> { 75657aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private static final int MAX_OFFSET_ANIMATION_DURATION = 600; // ms 757e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private static final int INVALID_POSITION = -1; 758e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 75972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 76072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Callback to allow control over any {@link AppBarLayout} dragging. 76172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 76272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public static abstract class DragCallback { 76372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 76472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Allows control over whether the given {@link AppBarLayout} can be dragged or not. 76572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 76672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * <p>Dragging is defined as a direct touch on the AppBarLayout with movement. This 76772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * call does not affect any nested scrolling.</p> 76872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 76972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * @return true if we are in a position to scroll the AppBarLayout via a drag, false 77072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * if not. 77172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 77272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public abstract boolean canDrag(@NonNull AppBarLayout appBarLayout); 77372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 77472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 775e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetDelta; 776a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 77750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes private boolean mSkipNestedPreScroll; 77847543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes private boolean mWasNestedFlung; 779631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 780c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov private ValueAnimatorCompat mOffsetAnimator; 78150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 782e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetToChildIndexOnLayout = INVALID_POSITION; 783e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private boolean mOffsetToChildIndexOnLayoutIsMinHeight; 784e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private float mOffsetToChildIndexOnLayoutPerc; 785e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 786d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private WeakReference<View> mLastNestedScrollingChildRef; 78772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes private DragCallback mOnDragCallback; 788d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 789a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior() {} 790a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 791a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior(Context context, AttributeSet attrs) { 792a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 793a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 794a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 795a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 796ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes public boolean onStartNestedScroll(CoordinatorLayout parent, AppBarLayout child, 797a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View directTargetChild, View target, int nestedScrollAxes) { 798f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // Return true if we're nested scrolling vertically, and we have scrollable children 799f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // and the scrolling view is big enough to scroll 800631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final boolean started = (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0 801f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes && child.hasScrollableChildren() 802ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes && parent.getHeight() - directTargetChild.getHeight() <= child.getHeight(); 803631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 804c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (started && mOffsetAnimator != null) { 805631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Cancel any offset animation 806c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 807631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 808631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 809d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // A new nested scroll has started so clear out the previous ref 810d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = null; 811d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 812631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return started; 813a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 814a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 815a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 816a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 817a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dx, int dy, int[] consumed) { 81850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy != 0 && !mSkipNestedPreScroll) { 81950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int min, max; 82050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy < 0) { 82150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling down 82250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getTotalScrollRange(); 82350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = min + child.getDownNestedPreScrollRange(); 82450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 82550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling up 82650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getUpNestedPreScrollRange(); 82750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = 0; 82850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 82950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes consumed[1] = scroll(coordinatorLayout, child, dy, min, max); 830a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 831a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 832a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 833a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 834a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 835a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dxConsumed, int dyConsumed, 836a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int dxUnconsumed, int dyUnconsumed) { 83750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dyUnconsumed < 0) { 83850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If the scrolling view is scrolling down but not consuming, it's probably be at 83950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // the top of it's content 84050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes scroll(coordinatorLayout, child, dyUnconsumed, 84150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes -child.getDownNestedScrollRange(), 0); 84250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Set the expanding flag so that onNestedPreScroll doesn't handle any events 84350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = true; 84450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 84550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // As we're no longer handling nested scrolls, reset the skip flag 84650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 847a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 84850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 849a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 85050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Override 851bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout abl, 85250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes View target) { 85347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes if (!mWasNestedFlung) { 854bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we haven't been flung then let's see if the current view has been set to snap 855bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes snapToChildIfNeeded(coordinatorLayout, abl); 856bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 857bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 858bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // Reset the flags 85950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 86047543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes mWasNestedFlung = false; 861d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // Keep a reference to the previous nested scrolling child 862d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = new WeakReference<>(target); 863d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 864d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 865d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes @Override 866631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public boolean onNestedFling(final CoordinatorLayout coordinatorLayout, 867631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final AppBarLayout child, View target, float velocityX, float velocityY, 868631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes boolean consumed) { 869bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes boolean flung = false; 870bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 871631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (!consumed) { 872631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // It has been consumed so let's fling ourselves 873bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = fling(coordinatorLayout, child, -child.getTotalScrollRange(), 874bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 0, -velocityY); 875631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 876631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we're scrolling up and the child also consumed the fling. We'll fake scroll 877c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas // up to our 'collapsed' offset 878631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (velocityY < 0) { 879631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling down 880bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int targetScroll = -child.getTotalScrollRange() 881631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes + child.getDownNestedPreScrollRange(); 882bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (getTopBottomOffsetForScrollingSibling() < targetScroll) { 883bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we're currently not expanded more than the target scroll, we'll 884bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // animate a fling 88557aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll, velocityY); 886bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = true; 887631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 888631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 889631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling up 890bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int targetScroll = -child.getUpNestedPreScrollRange(); 891bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (getTopBottomOffsetForScrollingSibling() > targetScroll) { 892bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we're currently not expanded less than the target scroll, we'll 893bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // animate a fling 89457aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll, velocityY); 895bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = true; 896631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 897631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 898631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 899631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 90047543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes mWasNestedFlung = flung; 901bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes return flung; 902631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 903631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 90472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 90572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Set a callback to control any {@link AppBarLayout} dragging. 90672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 90772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * @param callback the callback to use, or {@code null} to use the default behavior. 90872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 90972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public void setDragCallback(@Nullable DragCallback callback) { 91072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes mOnDragCallback = callback; 91172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 91272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 913631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private void animateOffsetTo(final CoordinatorLayout coordinatorLayout, 91457aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final AppBarLayout child, final int offset, float velocity) { 91557aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final int distance = Math.abs(getTopBottomOffsetForScrollingSibling() - offset); 91657aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 91757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final int duration; 91857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes velocity = Math.abs(velocity); 91957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes if (velocity > 0) { 92057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes duration = 3 * Math.round(1000 * (distance / velocity)); 92157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } else { 92257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final float distanceRatio = (float) distance / child.getHeight(); 92357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes duration = (int) ((distanceRatio + 1) * 150); 92457aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } 92557aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 92657aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetWithDuration(coordinatorLayout, child, offset, duration); 92757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } 92857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 92957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private void animateOffsetWithDuration(final CoordinatorLayout coordinatorLayout, 93057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final AppBarLayout child, final int offset, final int duration) { 931dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes final int currentOffset = getTopBottomOffsetForScrollingSibling(); 932dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes if (currentOffset == offset) { 933c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (mOffsetAnimator != null && mOffsetAnimator.isRunning()) { 934c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 935dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 936dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes return; 937dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 938dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 939c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (mOffsetAnimator == null) { 940c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator = ViewUtils.createAnimator(); 941c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setInterpolator(AnimationUtils.DECELERATE_INTERPOLATOR); 9425a0083cc8328f05b15efe0293b7aa83723cdd9adChris Banes mOffsetAnimator.addUpdateListener(new ValueAnimatorCompat.AnimatorUpdateListener() { 943631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 944631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void onAnimationUpdate(ValueAnimatorCompat animator) { 945ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(coordinatorLayout, child, 946631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes animator.getAnimatedIntValue()); 947631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 948631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes }); 949631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 950c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 951631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 952631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 95357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes mOffsetAnimator.setDuration(Math.min(duration, MAX_OFFSET_ANIMATION_DURATION)); 954c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setIntValues(currentOffset, offset); 955c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.start(); 956631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 957631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 958108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes private int getChildIndexOnOffset(AppBarLayout abl, final int offset) { 959bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes for (int i = 0, count = abl.getChildCount(); i < count; i++) { 960bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes View child = abl.getChildAt(i); 961bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (child.getTop() <= -offset && child.getBottom() >= -offset) { 962108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return i; 963bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 964bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 965108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return -1; 966bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 967bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 968bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes private void snapToChildIfNeeded(CoordinatorLayout coordinatorLayout, AppBarLayout abl) { 969bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int offset = getTopBottomOffsetForScrollingSibling(); 970108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int offsetChildIndex = getChildIndexOnOffset(abl, offset); 971108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offsetChildIndex >= 0) { 972108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final View offsetChild = abl.getChildAt(offsetChildIndex); 973bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final LayoutParams lp = (LayoutParams) offsetChild.getLayoutParams(); 974108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int flags = lp.getScrollFlags(); 975108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 976108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if ((flags & LayoutParams.FLAG_SNAP) == LayoutParams.FLAG_SNAP) { 977bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // We're set the snap, so animate the offset to the nearest edge 978108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes int snapTop = -offsetChild.getTop(); 979108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes int snapBottom = -offsetChild.getBottom(); 980108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 981108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offsetChildIndex == abl.getChildCount() - 1) { 982108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If this is the last child, we need to take the top inset into account 983108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom += abl.getTopInset(); 984108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 985dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 986108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (checkFlag(flags, LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED)) { 987108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If the view is set only exit until it is collapsed, we'll abide by that 988108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom += ViewCompat.getMinimumHeight(offsetChild); 989108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } else if (checkFlag(flags, LayoutParams.FLAG_QUICK_RETURN 990108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes | LayoutParams.SCROLL_FLAG_ENTER_ALWAYS)) { 991108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If it's set to always enter collapsed, it actually has two states. We 992108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // select the state and then snap within the state 993108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int seam = snapBottom + ViewCompat.getMinimumHeight(offsetChild); 994108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offset < seam) { 995108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapTop = seam; 996108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } else { 997108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom = seam; 998108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 999dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 1000dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 1001108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int newOffset = offset < (snapBottom + snapTop) / 2 1002108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes ? snapBottom 1003108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes : snapTop; 1004bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes animateOffsetTo(coordinatorLayout, abl, 100557aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes MathUtils.constrain(newOffset, -abl.getTotalScrollRange(), 0), 0); 1006bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 1007bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 1008bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 1009bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 1010108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes private static boolean checkFlag(final int flags, final int check) { 1011108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return (flags & check) == check; 1012108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 1013108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 1014631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 1015bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes public boolean onMeasureChild(CoordinatorLayout parent, AppBarLayout child, 1016bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, 1017bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes int heightUsed) { 1018bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes final CoordinatorLayout.LayoutParams lp = 1019bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes (CoordinatorLayout.LayoutParams) child.getLayoutParams(); 1020bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes if (lp.height == CoordinatorLayout.LayoutParams.WRAP_CONTENT) { 1021bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // If the view is set to wrap on it's height, CoordinatorLayout by default will 1022bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // cap the view at the CoL's height. Since the AppBarLayout can scroll, this isn't 1023bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // what we actually want, so we measure it ourselves with an unspecified spec to 1024bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // allow the child to be larger than it's parent 1025bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes parent.onMeasureChild(child, parentWidthMeasureSpec, widthUsed, 1026bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), heightUsed); 1027bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes return true; 1028bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes } 1029bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes 1030bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // Let the parent handle it as normal 1031bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes return super.onMeasureChild(parent, child, parentWidthMeasureSpec, widthUsed, 1032bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes parentHeightMeasureSpec, heightUsed); 1033bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes } 1034bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes 1035bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes @Override 10369995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public boolean onLayoutChild(CoordinatorLayout parent, AppBarLayout abl, 103750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int layoutDirection) { 10389995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes boolean handled = super.onLayoutChild(parent, abl, layoutDirection); 10399995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 10409995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int pendingAction = abl.getPendingAction(); 10419995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (pendingAction != PENDING_ACTION_NONE) { 10429995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final boolean animate = (pendingAction & PENDING_ACTION_ANIMATE_ENABLED) != 0; 10439995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if ((pendingAction & PENDING_ACTION_COLLAPSED) != 0) { 10449995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int offset = -abl.getUpNestedPreScrollRange(); 10459995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 104657aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(parent, abl, offset, 0); 10479995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 1048ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, offset); 10499995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10509995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if ((pendingAction & PENDING_ACTION_EXPANDED) != 0) { 10519995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 105257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(parent, abl, 0, 0); 10539995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 1054ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, 0); 10559995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10569995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10579995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if (mOffsetToChildIndexOnLayout >= 0) { 10589995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes View child = abl.getChildAt(mOffsetToChildIndexOnLayout); 1059e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int offset = -child.getBottom(); 1060e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (mOffsetToChildIndexOnLayoutIsMinHeight) { 1061e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes offset += ViewCompat.getMinimumHeight(child); 1062e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 1063e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes offset += Math.round(child.getHeight() * mOffsetToChildIndexOnLayoutPerc); 1064e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1065e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes setTopAndBottomOffset(offset); 1066e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 106750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 106879aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes // Finally reset any pending states 106979aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes abl.resetPendingAction(); 107079aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 107179aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes 107247543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // We may have changed size, so let's constrain the top and bottom offset correctly, 107347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // just in case we're out of the bounds 107447543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes setTopAndBottomOffset( 107547543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes MathUtils.constrain(getTopAndBottomOffset(), -abl.getTotalScrollRange(), 0)); 107647543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes 10771a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Make sure we dispatch the offset update 10781a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes abl.dispatchOffsetUpdates(getTopAndBottomOffset()); 107950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 108050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return handled; 1081a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1082a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 108372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 108472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes boolean canDragView(AppBarLayout view) { 108572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes if (mOnDragCallback != null) { 108672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // If there is a drag callback set, it's in control 108772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return mOnDragCallback.canDrag(view); 108872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 108972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 109072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // Else we'll use the default behaviour of seeing if it can scroll down 1091d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mLastNestedScrollingChildRef != null) { 109272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // If we have a reference to a scrolling view, check it 109372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes final View scrollingView = mLastNestedScrollingChildRef.get(); 109472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return scrollingView != null && scrollingView.isShown() 109572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes && !ViewCompat.canScrollVertically(scrollingView, -1); 109672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } else { 109772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // Otherwise we assume that the scrolling view hasn't been scrolled and can drag. 109872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return true; 1099d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1100d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1101d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 1102ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 110347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes void onFlingFinished(CoordinatorLayout parent, AppBarLayout layout) { 110447543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // At the end of a manual fling, check to see if we need to snap to the edge-child 110547543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes snapToChildIfNeeded(parent, layout); 110647543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes } 110747543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes 110847543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes @Override 110972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getMaxDragOffset(AppBarLayout view) { 111072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return -view.getDownNestedScrollRange(); 111172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 111272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 111372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 111472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getScrollRangeForDragFling(AppBarLayout view) { 111572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return view.getTotalScrollRange(); 111672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 111772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 111872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 111972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int setHeaderTopBottomOffset(CoordinatorLayout coordinatorLayout, 1120bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes AppBarLayout appBarLayout, int newOffset, int minOffset, int maxOffset) { 1121e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int curOffset = getTopBottomOffsetForScrollingSibling(); 1122a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int consumed = 0; 1123a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 11245e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes if (minOffset != 0 && curOffset >= minOffset && curOffset <= maxOffset) { 1125631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we have some scrolling range, and we're currently within the min and max 1126631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // offsets, calculate a new offset 112750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes newOffset = MathUtils.constrain(newOffset, minOffset, maxOffset); 1128a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (curOffset != newOffset) { 1129e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int interpolatedOffset = appBarLayout.hasChildWithInterpolator() 1130e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ? interpolateOffset(appBarLayout, newOffset) 1131e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes : newOffset; 1132e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 11331a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final boolean offsetChanged = setTopAndBottomOffset(interpolatedOffset); 1134631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 1135a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update how much dy we have consumed 1136a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes consumed = curOffset - newOffset; 1137a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update the stored sibling offset 1138e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetDelta = newOffset - interpolatedOffset; 1139a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1140a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (!offsetChanged && appBarLayout.hasChildWithInterpolator()) { 1141a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If the offset hasn't changed and we're using an interpolated scroll 1142a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // then we need to keep any dependent views updated. CoL will do this for 1143a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us when we move, but we need to do it manually when we don't (as an 1144a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // interpolated scroll may finish early). 1145a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes coordinatorLayout.dispatchDependentViewsChanged(appBarLayout); 1146a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1147a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1148631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Dispatch the updates to any listeners 11491a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes appBarLayout.dispatchOffsetUpdates(getTopAndBottomOffset()); 11501a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 11511a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Update the AppBarLayout's drawable state (for any elevation changes) 1152c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes updateAppBarLayoutDrawableState(coordinatorLayout, appBarLayout, newOffset, 11531a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes newOffset < curOffset ? -1 : 1); 1154a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 11555e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes } else { 11565e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // Reset the offset delta 11575e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes mOffsetDelta = 0; 1158a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1159a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1160a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return consumed; 1161a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1162a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1163bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes @VisibleForTesting 1164bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes boolean isOffsetAnimatorRunning() { 1165bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes return mOffsetAnimator != null && mOffsetAnimator.isRunning(); 1166bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes } 1167bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes 1168a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int interpolateOffset(AppBarLayout layout, final int offset) { 1169a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int absOffset = Math.abs(offset); 1170a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1171a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 1172a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = layout.getChildAt(i); 1173a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 117450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 1175a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 117650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 1177a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 117850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int childScrollableHeight = 0; 117950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int flags = childLp.getScrollFlags(); 118050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 1181b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // We're set to scroll so add the child's height plus margin 1182b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childScrollableHeight += child.getHeight() + childLp.topMargin 1183b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes + childLp.bottomMargin; 1184b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes 118550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 1186b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // For a collapsing scroll, we to take the collapsed height 1187b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // into account. 118850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes childScrollableHeight -= ViewCompat.getMinimumHeight(child); 118950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 119050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 119150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1192ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (ViewCompat.getFitsSystemWindows(child)) { 1193ea004a01f44aaf36212120c936952c1742d03d30Chris Banes childScrollableHeight -= layout.getTopInset(); 1194ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1195ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 119650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (childScrollableHeight > 0) { 119750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int offsetForView = absOffset - child.getTop(); 119850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int interpolatedDiff = Math.round(childScrollableHeight * 119950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes interpolator.getInterpolation( 120050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes offsetForView / (float) childScrollableHeight)); 120150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 120250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return Integer.signum(offset) * (child.getTop() + interpolatedDiff); 120350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 1204a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 120550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 120650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If we get to here then the view on the offset isn't suitable for interpolated 120750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // scrolling. So break out of the loop 120850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes break; 1209a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1210a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1211a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1212a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return offset; 1213a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1214a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1215c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes private void updateAppBarLayoutDrawableState(final CoordinatorLayout parent, 1216c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final AppBarLayout layout, final int offset, final int direction) { 12171a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final View child = getAppBarChildOnOffset(layout, offset); 12181a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (child != null) { 12191a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 12201a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int flags = childLp.getScrollFlags(); 12211a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes boolean collapsed = false; 12221a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12231a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 12241a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int minHeight = ViewCompat.getMinimumHeight(child); 12251a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (direction > 0 && (flags & (LayoutParams.SCROLL_FLAG_ENTER_ALWAYS 12271a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes | LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED)) != 0) { 12281a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // We're set to enter always collapsed so we are only collapsed when 12291a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // being scrolled down, and in a collapsed offset 12301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes collapsed = -offset >= child.getBottom() - minHeight - layout.getTopInset(); 12311a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 12321a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // We're set to exit until collapsed, so any offset which results in 12331a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // the minimum height (or less) being shown is collapsed 12341a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes collapsed = -offset >= child.getBottom() - minHeight - layout.getTopInset(); 12351a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12361a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12371a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1238c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final boolean changed = layout.setCollapsedState(collapsed); 1239c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes 1240c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes if (changed && Build.VERSION.SDK_INT >= 11 1241c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes && shouldJumpElevationState(parent, layout)) { 1242c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // If the collapsed state changed, we may need to 1243c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // jump to the current state if we have an overlapping view 1244c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes layout.jumpDrawablesToCurrentState(); 1245c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 1246c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 1247c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 1248c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes 1249c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes private boolean shouldJumpElevationState(CoordinatorLayout parent, AppBarLayout layout) { 1250c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // We should jump the elevated state if we have a dependent scrolling view which has 1251c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // an overlapping top (i.e. overlaps us) 1252c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final List<View> dependencies = parent.getDependents(layout); 1253c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes for (int i = 0, size = dependencies.size(); i < size; i++) { 1254c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final View dependency = dependencies.get(i); 1255c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final CoordinatorLayout.LayoutParams lp = 1256c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes (CoordinatorLayout.LayoutParams) dependency.getLayoutParams(); 1257c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final CoordinatorLayout.Behavior behavior = lp.getBehavior(); 1258c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes 1259c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes if (behavior instanceof ScrollingViewBehavior) { 1260c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return ((ScrollingViewBehavior) behavior).getOverlayTop() != 0; 1261c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 12621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 1263c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return false; 12641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private static View getAppBarChildOnOffset(final AppBarLayout layout, final int offset) { 12671a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int absOffset = Math.abs(offset); 12681a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 12691a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final View child = layout.getChildAt(i); 12701a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 12711a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return child; 12721a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12731a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12741a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return null; 12751a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12761a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1277ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 127872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getTopBottomOffsetForScrollingSibling() { 1279e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return getTopAndBottomOffset() + mOffsetDelta; 1280e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1281e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1282e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1283e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public Parcelable onSaveInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout) { 1284e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final Parcelable superState = super.onSaveInstanceState(parent, appBarLayout); 1285e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int offset = getTopAndBottomOffset(); 1286e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1287e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Try and find the first visible child... 1288e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes for (int i = 0, count = appBarLayout.getChildCount(); i < count; i++) { 1289e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes View child = appBarLayout.getChildAt(i); 1290e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int visBottom = child.getBottom() + offset; 1291e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1292e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (child.getTop() + offset <= 0 && visBottom >= 0) { 1293e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = new SavedState(superState); 1294e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibleChildIndex = i; 1295c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas ss.firstVisibleChildAtMinimumHeight = 1296e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes visBottom == ViewCompat.getMinimumHeight(child); 1297c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas ss.firstVisibleChildPercentageShown = visBottom / (float) child.getHeight(); 1298e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return ss; 1299e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1300e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1301e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1302e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Else we'll just return the super state 1303e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return superState; 1304e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1305e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1306e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1307e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void onRestoreInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout, 1308e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes Parcelable state) { 1309e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (state instanceof SavedState) { 1310e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = (SavedState) state; 1311e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, ss.getSuperState()); 1312e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = ss.firstVisibleChildIndex; 1313c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas mOffsetToChildIndexOnLayoutPerc = ss.firstVisibleChildPercentageShown; 1314c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas mOffsetToChildIndexOnLayoutIsMinHeight = ss.firstVisibleChildAtMinimumHeight; 1315e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 1316e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, state); 1317e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 1318e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1319e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1320e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 132105f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banes protected static class SavedState extends AbsSavedState { 1322e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int firstVisibleChildIndex; 1323c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas float firstVisibleChildPercentageShown; 1324c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas boolean firstVisibleChildAtMinimumHeight; 1325e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 132662ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes public SavedState(Parcel source, ClassLoader loader) { 132705f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banes super(source, loader); 1328e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibleChildIndex = source.readInt(); 1329c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas firstVisibleChildPercentageShown = source.readFloat(); 1330c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas firstVisibleChildAtMinimumHeight = source.readByte() != 0; 1331e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1332e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1333e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState(Parcelable superState) { 1334e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super(superState); 1335e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1336e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1337e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1338e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void writeToParcel(Parcel dest, int flags) { 1339e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.writeToParcel(dest, flags); 1340e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeInt(firstVisibleChildIndex); 1341c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas dest.writeFloat(firstVisibleChildPercentageShown); 1342c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas dest.writeByte((byte) (firstVisibleChildAtMinimumHeight ? 1 : 0)); 1343e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1344e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1345e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public static final Parcelable.Creator<SavedState> CREATOR = 134662ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes ParcelableCompat.newCreator(new ParcelableCompatCreatorCallbacks<SavedState>() { 1347e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 134862ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes public SavedState createFromParcel(Parcel source, ClassLoader loader) { 134962ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes return new SavedState(source, loader); 1350e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1351e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1352e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1353e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState[] newArray(int size) { 1354e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return new SavedState[size]; 1355e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 135662ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes }); 1357a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1358a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1359a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1360a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1361a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Behavior which should be used by {@link View}s which can scroll vertically and support 1362a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * nested scrolling to automatically scroll any {@link AppBarLayout} siblings. 1363a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1364ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class ScrollingViewBehavior extends HeaderScrollingViewBehavior { 1365a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1366a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior() {} 1367a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1368a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior(Context context, AttributeSet attrs) { 1369a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 1370a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1371b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final TypedArray a = context.obtainStyledAttributes(attrs, 137273e7a06fb66110495fa4e98a91831a47feab2526Chris Banes R.styleable.ScrollingViewBehavior_Layout); 1373b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes setOverlayTop(a.getDimensionPixelSize( 137473e7a06fb66110495fa4e98a91831a47feab2526Chris Banes R.styleable.ScrollingViewBehavior_Layout_behavior_overlapTop, 0)); 1375a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 1376a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1377a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1378a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1379a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) { 1380a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We depend on any AppBarLayouts 1381a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return dependency instanceof AppBarLayout; 1382a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1383a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1384a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1385a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean onDependentViewChanged(CoordinatorLayout parent, View child, 1386a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View dependency) { 13875e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes offsetChildAsNeeded(parent, child, dependency); 13880d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return false; 13890d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 13900d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 139100a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes @Override 13924cf1d92509224fab3ca69b419a005c536ab75c5cChris Banes public boolean onRequestChildRectangleOnScreen(CoordinatorLayout parent, View child, 139300a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes Rect rectangle, boolean immediate) { 139400a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes final AppBarLayout header = findFirstDependency(parent.getDependencies(child)); 139500a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes if (header != null) { 139600a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes // Offset the rect by the child's left/top 139700a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes rectangle.offset(child.getLeft(), child.getTop()); 139800a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes 139900a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes final Rect parentRect = mTempRect1; 140000a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes parentRect.set(0, 0, parent.getWidth(), parent.getHeight()); 140100a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes 140200a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes if (!parentRect.contains(rectangle)) { 140300a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes // If the rectangle can not be fully seen the visible bounds, collapse 140400a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes // the AppBarLayout 140500a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes header.setExpanded(false, !immediate); 140600a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes return true; 140700a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes } 140800a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes } 140900a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes return false; 141000a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes } 141100a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes 14125e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes private void offsetChildAsNeeded(CoordinatorLayout parent, View child, View dependency) { 1413a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final CoordinatorLayout.Behavior behavior = 1414a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes ((CoordinatorLayout.LayoutParams) dependency.getLayoutParams()).getBehavior(); 1415a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (behavior instanceof Behavior) { 14165e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // Offset the child, pinning it to the bottom the header-dependency, maintaining 1417bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes // any vertical gap and overlap 14185e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes final Behavior ablBehavior = (Behavior) behavior; 1419318baf84dade07174d71e10322e3b10ab4b0c28cChris Banes ViewCompat.offsetTopAndBottom(child, (dependency.getBottom() - child.getTop()) 14205e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes + ablBehavior.mOffsetDelta 14215e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes + getVerticalLayoutGap() 1422b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes - getOverlapPixelsForOffset(dependency)); 1423ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1424ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1425ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 1426b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes @Override 1427b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes float getOverlapRatioForOffset(final View header) { 1428b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes if (header instanceof AppBarLayout) { 1429b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final AppBarLayout abl = (AppBarLayout) header; 1430ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int totalScrollRange = abl.getTotalScrollRange(); 1431ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int preScrollDown = abl.getDownNestedPreScrollRange(); 1432b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final int offset = getAppBarLayoutOffset(abl); 1433a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1434ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (preScrollDown != 0 && (totalScrollRange + offset) <= preScrollDown) { 1435ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // If we're in a pre-scroll down. Don't use the offset at all. 1436ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return 0; 1437a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 1438ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int availScrollRange = totalScrollRange - preScrollDown; 1439dfb857dd12b359c0bdae11a23e039f286d54dc0aChris Banes if (availScrollRange != 0) { 1440ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Else we'll use a interpolated ratio of the overlap, depending on offset 1441b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 1f + (offset / (float) availScrollRange); 1442ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1443a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1444a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1445b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 0f; 1446a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1447a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1448b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes private static int getAppBarLayoutOffset(AppBarLayout abl) { 1449b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final CoordinatorLayout.Behavior behavior = 1450b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes ((CoordinatorLayout.LayoutParams) abl.getLayoutParams()).getBehavior(); 1451b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes if (behavior instanceof Behavior) { 1452b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return ((Behavior) behavior).getTopBottomOffsetForScrollingSibling(); 1453b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes } 1454b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 0; 1455a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1456a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1457ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 145800a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes AppBarLayout findFirstDependency(List<View> views) { 1459a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = views.size(); i < z; i++) { 1460a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View view = views.get(i); 1461a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (view instanceof AppBarLayout) { 146200a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes return (AppBarLayout) view; 1463a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1464a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1465a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return null; 1466a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1467ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor 1468ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 146972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getScrollRange(View v) { 1470ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor if (v instanceof AppBarLayout) { 1471ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return ((AppBarLayout) v).getTotalScrollRange(); 1472ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } else { 1473ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return super.getScrollRange(v); 1474ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1475ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1476a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1477a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes} 1478