1a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes/* 2a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Copyright (C) 2015 The Android Open Source Project 3a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 4a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Licensed under the Apache License, Version 2.0 (the "License"); 5a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * you may not use this file except in compliance with the License. 6a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * You may obtain a copy of the License at 7a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 8a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * http://www.apache.org/licenses/LICENSE-2.0 9a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 10a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Unless required by applicable law or agreed to in writing, software 11a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * distributed under the License is distributed on an "AS IS" BASIS, 12a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * See the License for the specific language governing permissions and 14a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * limitations under the License. 15a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 16a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 17a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banespackage android.support.design.widget; 18a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 198e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikasimport static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP; 20ee1b969af871a7015fc2df11f8d342a4e6cf40f0Hyundo Moonimport static android.support.v4.utils.ObjectUtils.objectEquals; 218e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas 22ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikasimport android.animation.ValueAnimator; 23a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.content.Context; 24a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.content.res.TypedArray; 2500a00a7d3ba8279294f63994473afc32e05dcf10Chris Banesimport android.graphics.Rect; 261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banesimport android.os.Build; 27e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banesimport android.os.Parcel; 28e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banesimport android.os.Parcelable; 2950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport android.support.annotation.IntDef; 3072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banesimport android.support.annotation.NonNull; 3172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banesimport android.support.annotation.Nullable; 328f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viveretteimport android.support.annotation.RequiresApi; 33c39d9c75590eca86a5e7e32a8824ba04a0d42e9bAlan Viveretteimport android.support.annotation.RestrictTo; 3413633353237d6506f4c436b459bc8be8c3d7ed68Chris Banesimport android.support.annotation.VisibleForTesting; 35a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.support.design.R; 3612e0a308d1ab838cb05c395baa6f1251fcbb2363Aurimas Liutikasimport android.support.v4.math.MathUtils; 37d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Roskyimport android.support.v4.os.BuildCompat; 3805f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banesimport android.support.v4.view.AbsSavedState; 39a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.support.v4.view.ViewCompat; 406ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banesimport android.support.v4.view.WindowInsetsCompat; 41a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.util.AttributeSet; 42a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.View; 43a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.ViewGroup; 44a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.animation.Interpolator; 45a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.widget.LinearLayout; 46a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 4750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.Retention; 4850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.RetentionPolicy; 49d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport java.lang.ref.WeakReference; 50631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banesimport java.util.ArrayList; 51a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport java.util.List; 52a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 53a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes/** 54a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * AppBarLayout is a vertical {@link LinearLayout} which implements many of the features of 559fb154338a62edc2c57dc036895199d6f1769400Chris Banes * material designs app bar concept, namely scrolling gestures. 56a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 57a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Children should provide their desired scrolling behavior through 58a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams#setScrollFlags(int)} and the associated layout xml attribute: 59a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@code app:layout_scrollFlags}. 60a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 61a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 62a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * This view depends heavily on being used as a direct child within a {@link CoordinatorLayout}. 63a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * If you use AppBarLayout within a different {@link ViewGroup}, most of it's functionality will 64a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * not work. 65a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 669fb154338a62edc2c57dc036895199d6f1769400Chris Banes * AppBarLayout also requires a separate scrolling sibling in order to know when to scroll. 679fb154338a62edc2c57dc036895199d6f1769400Chris Banes * The binding is done through the {@link ScrollingViewBehavior} behavior class, meaning that you 689fb154338a62edc2c57dc036895199d6f1769400Chris Banes * should set your scrolling view's behavior to be an instance of {@link ScrollingViewBehavior}. 699fb154338a62edc2c57dc036895199d6f1769400Chris Banes * A string resource containing the full class name is available. 70a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 71a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <pre> 72a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.CoordinatorLayout 73a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:android="http://schemas.android.com/apk/res/android" 74a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:app="http://schemas.android.com/apk/res-auto" 75a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 76a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent"> 77a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 78a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v4.widget.NestedScrollView 79a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 80a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent" 81a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_behavior="@string/appbar_scrolling_view_behavior"> 82a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 83a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <!-- Your scrolling content --> 84a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 85a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.v4.widget.NestedScrollView> 86a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 87a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.AppBarLayout 88a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="wrap_content" 89a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent"> 90a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 91a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v7.widget.Toolbar 92a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 93a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 94a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 95a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.TabLayout 96a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 97a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 98a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 99a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.AppBarLayout> 100a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 101a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.CoordinatorLayout> 102a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </pre> 103a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 104a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see <a href="http://www.google.com/design/spec/layout/structure.html#structure-app-bar"> 105a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * http://www.google.com/design/spec/layout/structure.html#structure-app-bar</a> 106a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 107a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes@CoordinatorLayout.DefaultBehavior(AppBarLayout.Behavior.class) 108a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banespublic class AppBarLayout extends LinearLayout { 109a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 110657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas static final int PENDING_ACTION_NONE = 0x0; 111657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas static final int PENDING_ACTION_EXPANDED = 0x1; 112657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas static final int PENDING_ACTION_COLLAPSED = 0x2; 113657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas static final int PENDING_ACTION_ANIMATE_ENABLED = 0x4; 1142bab57ed97f284a8152d180cca796739afa3a71dChris Banes static final int PENDING_ACTION_FORCE = 0x8; 1159995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 116a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 117631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Interface definition for a callback to be invoked when an {@link AppBarLayout}'s vertical 118631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * offset changes. 119a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 120631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public interface OnOffsetChangedListener { 121a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 122a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Called when the {@link AppBarLayout}'s layout offset has been changed. This allows 123a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * child views to implement custom behavior based on the offset (for instance pinning a 124a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * view at a certain y value). 125a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 126631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param appBarLayout the {@link AppBarLayout} which offset has changed 12750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes * @param verticalOffset the vertical offset for the parent {@link AppBarLayout}, in px 128a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 129631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset); 130a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 131a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 132a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private static final int INVALID_SCROLL_RANGE = -1; 133a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 134a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mTotalScrollRange = INVALID_SCROLL_RANGE; 135a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownPreScrollRange = INVALID_SCROLL_RANGE; 136a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownScrollRange = INVALID_SCROLL_RANGE; 137a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1381a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mHaveChildWithInterpolator; 13950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1409995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private int mPendingAction = PENDING_ACTION_NONE; 1419995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 1426ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes private WindowInsetsCompat mLastInsets; 1436ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 1441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private List<OnOffsetChangedListener> mListeners; 1451a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1461a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mCollapsible; 1471a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mCollapsed; 1481a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 149ee01b9bca75c41beddce986596a91ecec12eca5eKirill Grouchnikov private int[] mTmpStatesArray; 150631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 151a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context) { 152a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes this(context, null); 153a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 154a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 155a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context, AttributeSet attrs) { 156a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 157a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes setOrientation(VERTICAL); 15850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 159809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes ThemeUtils.checkAppCompatTheme(context); 160809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes 1611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21) { 1621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Use the bounds view outline provider so that we cast a shadow, even without a 1631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // background 1641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setBoundsViewOutlineProvider(this); 1651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // If we're running on API 21+, we should reset any state list animator from our 1671a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // default style 1681a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setStateListAnimatorFromAttrs(this, attrs, 0, 1691a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes R.style.Widget_Design_AppBarLayout); 1701a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 1711a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1721a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AppBarLayout, 17350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 0, R.style.Widget_Design_AppBarLayout); 17447082c30c630c34829439a9eecd1cf7e8d255a86Aurimas Liutikas ViewCompat.setBackground(this, a.getDrawable(R.styleable.AppBarLayout_android_background)); 1759995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (a.hasValue(R.styleable.AppBarLayout_expanded)) { 1762bab57ed97f284a8152d180cca796739afa3a71dChris Banes setExpanded(a.getBoolean(R.styleable.AppBarLayout_expanded, false), false, false); 1779995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 1781a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21 && a.hasValue(R.styleable.AppBarLayout_elevation)) { 1791a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setDefaultAppBarLayoutStateListAnimator( 1801a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes this, a.getDimensionPixelSize(R.styleable.AppBarLayout_elevation, 0)); 1811a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 182d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky if (BuildCompat.isAtLeastO()) { 183d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky // In O+, we have these values set in the style. Since there is no defStyleAttr for 184d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky // AppBarLayout at the AppCompat level, check for these attributes here. 185d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky if (a.hasValue(R.styleable.AppBarLayout_android_keyboardNavigationCluster)) { 186d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky this.setKeyboardNavigationCluster(a.getBoolean( 187d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky R.styleable.AppBarLayout_android_keyboardNavigationCluster, false)); 188d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky } 189d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky if (a.hasValue(R.styleable.AppBarLayout_android_touchscreenBlocksFocus)) { 190d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky this.setTouchscreenBlocksFocus(a.getBoolean( 191d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky R.styleable.AppBarLayout_android_touchscreenBlocksFocus, false)); 192d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky } 193d2d90794ffd1ab661708ec28c1f5e000c813aaf8Evan Rosky } 19450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes a.recycle(); 19550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1966ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes ViewCompat.setOnApplyWindowInsetsListener(this, 1976ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes new android.support.v4.view.OnApplyWindowInsetsListener() { 1986ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes @Override 1996ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public WindowInsetsCompat onApplyWindowInsets(View v, 2006ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes WindowInsetsCompat insets) { 2018818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes return onWindowInsetChanged(insets); 2026ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 2036ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes }); 204631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 205631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 206631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 207631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Add a listener that will be called when the offset of this {@link AppBarLayout} changes. 208631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 209631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener The listener that will be called when the offset changes.] 210631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 211631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @see #removeOnOffsetChangedListener(OnOffsetChangedListener) 212631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 213631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void addOnOffsetChangedListener(OnOffsetChangedListener listener) { 2141a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners == null) { 2151a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mListeners = new ArrayList<>(); 2161a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2176f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes if (listener != null && !mListeners.contains(listener)) { 2186f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.add(listener); 219631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 220631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 221631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 222631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 223631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Remove the previously added {@link OnOffsetChangedListener}. 224631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 225631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener the listener to remove. 226631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 227631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void removeOnOffsetChangedListener(OnOffsetChangedListener listener) { 2281a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners != null && listener != null) { 2296f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.remove(listener); 230631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 231a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 232a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 233a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 234ea004a01f44aaf36212120c936952c1742d03d30Chris Banes protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 235ea004a01f44aaf36212120c936952c1742d03d30Chris Banes super.onMeasure(widthMeasureSpec, heightMeasureSpec); 236ea004a01f44aaf36212120c936952c1742d03d30Chris Banes invalidateScrollRanges(); 237ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 238ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 239ea004a01f44aaf36212120c936952c1742d03d30Chris Banes @Override 240a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected void onLayout(boolean changed, int l, int t, int r, int b) { 241a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.onLayout(changed, l, t, r, b); 24279aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes invalidateScrollRanges(); 243a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 244a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = false; 245a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 246a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 247a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 248a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 249a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 250a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 251a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = true; 252a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 253a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 254a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 2551a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 2561a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes updateCollapsible(); 2571a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2581a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 2591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private void updateCollapsible() { 2601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes boolean haveCollapsibleChild = false; 2611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 2621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (((LayoutParams) getChildAt(i).getLayoutParams()).isCollapsible()) { 2631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes haveCollapsibleChild = true; 2641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes break; 2651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 26757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes setCollapsibleState(haveCollapsibleChild); 268a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 269a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 270ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void invalidateScrollRanges() { 271ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Invalidate the scroll ranges 272ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mTotalScrollRange = INVALID_SCROLL_RANGE; 273ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownPreScrollRange = INVALID_SCROLL_RANGE; 274ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownScrollRange = INVALID_SCROLL_RANGE; 275ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 276ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 277a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 278a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setOrientation(int orientation) { 279a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (orientation != VERTICAL) { 280a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes throw new IllegalArgumentException("AppBarLayout is always vertical and does" 281a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes + " not support horizontal orientation"); 282a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 283a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.setOrientation(orientation); 284a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 285a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 2869995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2879995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not, animating if it has already 2889995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * been laid out. 2899995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2909995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2919995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2929995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2939995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2949995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2959995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2969995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2979995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2989995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded) { 2999995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(expanded, ViewCompat.isLaidOut(this)); 3009995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 3019995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 3029995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 3039995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not. 3049995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 3059995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 3069995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 3079995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 3089995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 3099995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 3109995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param animate Whether to animate to the new state 3119995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 3129995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 3139995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 3149995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded, boolean animate) { 3152bab57ed97f284a8152d180cca796739afa3a71dChris Banes setExpanded(expanded, animate, true); 3162bab57ed97f284a8152d180cca796739afa3a71dChris Banes } 3172bab57ed97f284a8152d180cca796739afa3a71dChris Banes 3182bab57ed97f284a8152d180cca796739afa3a71dChris Banes private void setExpanded(boolean expanded, boolean animate, boolean force) { 3199995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = (expanded ? PENDING_ACTION_EXPANDED : PENDING_ACTION_COLLAPSED) 3202bab57ed97f284a8152d180cca796739afa3a71dChris Banes | (animate ? PENDING_ACTION_ANIMATE_ENABLED : 0) 3212bab57ed97f284a8152d180cca796739afa3a71dChris Banes | (force ? PENDING_ACTION_FORCE : 0); 3229995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes requestLayout(); 3239995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 3249995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 325a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 326a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 327a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return p instanceof LayoutParams; 328a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 329a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 330a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 331a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateDefaultLayoutParams() { 332a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 333a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 334a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 335a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 336a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams generateLayoutParams(AttributeSet attrs) { 337a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(getContext(), attrs); 338a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 339a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 340a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 341a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 3428f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viverette if (Build.VERSION.SDK_INT >= 19 && p instanceof LinearLayout.LayoutParams) { 343a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((LinearLayout.LayoutParams) p); 344a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (p instanceof MarginLayoutParams) { 345a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((MarginLayoutParams) p); 346a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 347a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(p); 348a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 349a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 350657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas boolean hasChildWithInterpolator() { 351a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mHaveChildWithInterpolator; 352a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 353a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 354a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 3556ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes * Returns the scroll range of all children. 356a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 357a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @return the scroll range in px 358a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 3596ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public final int getTotalScrollRange() { 360a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mTotalScrollRange != INVALID_SCROLL_RANGE) { 361a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mTotalScrollRange; 362a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 363a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 364a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 365a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 366a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 367a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 368ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 369a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 370a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 371a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 372a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 373b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += childHeight + lp.topMargin + lp.bottomMargin; 374a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 375a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 376a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing scroll, we to take the collapsed height into account. 3776ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // We also break straight away since later views can't scroll beneath 378a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us 3796ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes range -= ViewCompat.getMinimumHeight(child); 3806ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes break; 381a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 382a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 383a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 384a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 385a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 386a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 387a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 3884832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes return mTotalScrollRange = Math.max(0, range - getTopInset()); 389a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 390a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 391657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas boolean hasScrollableChildren() { 392a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return getTotalScrollRange() != 0; 393a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 394a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 395a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 396a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling up from a nested pre-scroll. 397a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 398657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas int getUpNestedPreScrollRange() { 39950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return getTotalScrollRange(); 400a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 401a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 402a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 403a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested pre-scroll. 404a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 405657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas int getDownNestedPreScrollRange() { 406a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownPreScrollRange != INVALID_SCROLL_RANGE) { 407a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 408a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownPreScrollRange; 409a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 410a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 411a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 412a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = getChildCount() - 1; i >= 0; i--) { 413a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 414a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 415ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 416a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 417a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 418a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.FLAG_QUICK_RETURN) == LayoutParams.FLAG_QUICK_RETURN) { 419b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // First take the margin into account 420b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += lp.topMargin + lp.bottomMargin; 421a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // The view has the quick return flag combination... 422a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED) != 0) { 423a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If they're set to enter collapsed, use the minimum height 424a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += ViewCompat.getMinimumHeight(child); 42547543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes } else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 42647543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // Only enter by the amount of the collapsed height 42747543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes range += childHeight - ViewCompat.getMinimumHeight(child); 428a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 429116332176fa904af2f701011de8d4f2524c10a8eChris Banes // Else use the full height (minus the top inset) 430116332176fa904af2f701011de8d4f2524c10a8eChris Banes range += childHeight - getTopInset(); 431a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 432a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (range > 0) { 433a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we've hit an non-quick return scrollable view, and we've already hit a 434a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // quick return view, return now 435a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 436a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 437a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 43813633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes return mDownPreScrollRange = Math.max(0, range); 439a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 440a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 441a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 442a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested scroll. 443a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 444657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas int getDownNestedScrollRange() { 445a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownScrollRange != INVALID_SCROLL_RANGE) { 446a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 447a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownScrollRange; 448a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 449a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 450a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 451c1ce4f6cf4d99d6856c4259bf1bb1cb56f604737Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 452a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 453a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 454ea004a01f44aaf36212120c936952c1742d03d30Chris Banes int childHeight = child.getMeasuredHeight(); 455b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childHeight += lp.topMargin + lp.bottomMargin; 456a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 457a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 458a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 459a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 460a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 461a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 462a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 463a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 464a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing exit scroll, we to take the collapsed height into account. 4654832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes // We also break the range straight away since later views can't scroll 466a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // beneath us 4674832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes range -= ViewCompat.getMinimumHeight(child) + getTopInset(); 4684832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes break; 469a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 470a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 471a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 472a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 473a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 474a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 475a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 4764c33be829067714342b629d29329206bc2116afeChris Banes return mDownScrollRange = Math.max(0, range); 477a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 478a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 479657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas void dispatchOffsetUpdates(int offset) { 4801a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Iterate backwards through the list so that most recently added listeners 4811a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // get the first chance to decide 4821a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners != null) { 4831a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = mListeners.size(); i < z; i++) { 4841a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final OnOffsetChangedListener listener = mListeners.get(i); 4851a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (listener != null) { 4861a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes listener.onOffsetChanged(this, offset); 4871a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4881a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4891a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4901a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4911a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 49250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int getMinimumHeightForVisibleOverlappingContent() { 49317ed3263761329f6aa6796941358c41001fff325Chris Banes final int topInset = getTopInset(); 49450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int minHeight = ViewCompat.getMinimumHeight(this); 49550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (minHeight != 0) { 49650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If this layout has a min height, use it (doubled) 4976ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes return (minHeight * 2) + topInset; 49850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 49950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 50050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Otherwise, we'll use twice the min height of our last child 50150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int childCount = getChildCount(); 502b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes final int lastChildMinHeight = childCount >= 1 503b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes ? ViewCompat.getMinimumHeight(getChildAt(childCount - 1)) : 0; 504b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes if (lastChildMinHeight != 0) { 505b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes return (lastChildMinHeight * 2) + topInset; 506b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes } 507b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes 508b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes // If we reach here then we don't have a min height explicitly set. Instead we'll take a 509b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes // guess at 1/3 of our height being visible 510b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes return getHeight() / 3; 51150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 51250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 5131a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Override 5141a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes protected int[] onCreateDrawableState(int extraSpace) { 515ee01b9bca75c41beddce986596a91ecec12eca5eKirill Grouchnikov if (mTmpStatesArray == null) { 516ee01b9bca75c41beddce986596a91ecec12eca5eKirill Grouchnikov // Note that we can't allocate this at the class level (in declaration) since 517ee01b9bca75c41beddce986596a91ecec12eca5eKirill Grouchnikov // some paths in super View constructor are going to call this method before 518ee01b9bca75c41beddce986596a91ecec12eca5eKirill Grouchnikov // that 519ee01b9bca75c41beddce986596a91ecec12eca5eKirill Grouchnikov mTmpStatesArray = new int[2]; 520ee01b9bca75c41beddce986596a91ecec12eca5eKirill Grouchnikov } 5211a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int[] extraStates = mTmpStatesArray; 5221a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int[] states = super.onCreateDrawableState(extraSpace + extraStates.length); 5231a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 5241a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes extraStates[0] = mCollapsible ? R.attr.state_collapsible : -R.attr.state_collapsible; 5251a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes extraStates[1] = mCollapsible && mCollapsed 5261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ? R.attr.state_collapsed : -R.attr.state_collapsed; 5271a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 5281a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return mergeDrawableStates(states, extraStates); 5291a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 531c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes /** 532c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * Sets whether the AppBarLayout has collapsible children or not. 533c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * 534c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * @return true if the collapsible state changed 535c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes */ 536c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes private boolean setCollapsibleState(boolean collapsible) { 5371a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mCollapsible != collapsible) { 5381a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mCollapsible = collapsible; 5391a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes refreshDrawableState(); 540c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return true; 5411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 542c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return false; 5431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 545c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes /** 546c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * Sets whether the AppBarLayout is in a collapsed state or not. 547c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * 548c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes * @return true if the collapsed state changed 549c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes */ 550657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas boolean setCollapsedState(boolean collapsed) { 5511a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mCollapsed != collapsed) { 5521a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mCollapsed = collapsed; 5531a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes refreshDrawableState(); 554c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return true; 5551a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 556c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return false; 5571a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5581a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 55950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** 5601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @deprecated target elevation is now deprecated. AppBarLayout's elevation is now 561926cd28257536b1206934d69585a2dab100147d5Chris Banes * controlled via a {@link android.animation.StateListAnimator}. If a target 562c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas * elevation is set, either by this method or the {@code app:elevation} attribute, 563926cd28257536b1206934d69585a2dab100147d5Chris Banes * a new state list animator is created which uses the given {@code elevation} value. 564631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 5651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_elevation 56650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes */ 5671a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Deprecated 568631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void setTargetElevation(float elevation) { 5691a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21) { 5701a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setDefaultAppBarLayoutStateListAnimator(this, elevation); 5711a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 572631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 573631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 574631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 5751a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @deprecated target elevation is now deprecated. AppBarLayout's elevation is now 576926cd28257536b1206934d69585a2dab100147d5Chris Banes * controlled via a {@link android.animation.StateListAnimator}. This method now 577926cd28257536b1206934d69585a2dab100147d5Chris Banes * always returns 0. 578631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 5791a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Deprecated 580631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public float getTargetElevation() { 5811a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return 0; 58250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 58350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 584657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas int getPendingAction() { 5859995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes return mPendingAction; 5869995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 5879995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 588657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas void resetPendingAction() { 5899995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = PENDING_ACTION_NONE; 5909995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 5919995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 59213633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes @VisibleForTesting 59313633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes final int getTopInset() { 594ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0; 595ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 596ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 597657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas WindowInsetsCompat onWindowInsetChanged(final WindowInsetsCompat insets) { 5988818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes WindowInsetsCompat newInsets = null; 5998818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 6008818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes if (ViewCompat.getFitsSystemWindows(this)) { 6018818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes // If we're set to fit system windows, keep the insets 6028818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes newInsets = insets; 6038818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes } 6048818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 6058818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes // If our insets have changed, keep them and invalidate the scroll ranges... 606101d1376f87b5d4e82942a0b264c99a9a009b521Kirill Grouchnikov if (!objectEquals(mLastInsets, newInsets)) { 6078818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes mLastInsets = newInsets; 6088818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes invalidateScrollRanges(); 6098818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes } 6108818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 61117ed3263761329f6aa6796941358c41001fff325Chris Banes return insets; 6126ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 6136ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 614a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static class LayoutParams extends LinearLayout.LayoutParams { 61550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 61650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** @hide */ 6178e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 61850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @IntDef(flag=true, value={ 61950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_SCROLL, 62050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_EXIT_UNTIL_COLLAPSED, 62150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_ENTER_ALWAYS, 622bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED, 623bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_SNAP 62450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes }) 62550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Retention(RetentionPolicy.SOURCE) 62650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public @interface ScrollFlags {} 62750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 628a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 629a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The view will be scroll in direct relation to scroll events. This flag needs to be 630a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * set for any of the other flags to take effect. If any sibling views 631a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * before this one do not have this flag, then this value has no effect. 632a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 633a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_SCROLL = 0x1; 634a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 635a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 636a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When exiting (scrolling off screen) the view will be scrolled until it is 637a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 'collapsed'. The collapsed height is defined by the view's minimum height. 638a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 639a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 640a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 641a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 642a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_EXIT_UNTIL_COLLAPSED = 0x2; 643a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 644a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 645a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When entering (scrolling on screen) the view will scroll on any downwards 646a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll event, regardless of whether the scrolling view is also scrolling. This 647a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * is commonly referred to as the 'quick return' pattern. 648a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 649a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS = 0x4; 650a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 651a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 652a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * An additional flag for 'enterAlways' which modifies the returning view to 653a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * only initially scroll back to it's collapsed height. Once the scrolling view has 654a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * reached the end of it's scroll range, the remainder of this view will be scrolled 655a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * into view. The collapsed height is defined by the view's minimum height. 656a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 657a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 658a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 659a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 660a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED = 0x8; 661a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 662a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 663bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Upon a scroll ending, if the view is only partially visible then it will be snapped 664bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * and scrolled to it's closest edge. For example, if the view only has it's bottom 25% 665bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * displayed, it will be scrolled off screen completely. Conversely, if it's bottom 75% 666bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * is visible then it will be scrolled fully into view. 667bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes */ 668bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public static final int SCROLL_FLAG_SNAP = 0x10; 669bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 670bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes /** 671bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Internal flags which allows quick checking features 672a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 673a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes static final int FLAG_QUICK_RETURN = SCROLL_FLAG_SCROLL | SCROLL_FLAG_ENTER_ALWAYS; 674bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes static final int FLAG_SNAP = SCROLL_FLAG_SCROLL | SCROLL_FLAG_SNAP; 6751a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes static final int COLLAPSIBLE_FLAGS = SCROLL_FLAG_EXIT_UNTIL_COLLAPSED 6761a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes | SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED; 677a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 678a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int mScrollFlags = SCROLL_FLAG_SCROLL; 679a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes Interpolator mScrollInterpolator; 680a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 681a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(Context c, AttributeSet attrs) { 682a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(c, attrs); 683c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.AppBarLayout_Layout); 684c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes mScrollFlags = a.getInt(R.styleable.AppBarLayout_Layout_layout_scrollFlags, 0); 685c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes if (a.hasValue(R.styleable.AppBarLayout_Layout_layout_scrollInterpolator)) { 686a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int resId = a.getResourceId( 687c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes R.styleable.AppBarLayout_Layout_layout_scrollInterpolator, 0); 688a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = android.view.animation.AnimationUtils.loadInterpolator( 689a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes c, resId); 690a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 691a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 692a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 693a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 694a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height) { 695a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height); 696a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 697a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 698a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height, float weight) { 699a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height, weight); 700a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 701a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 702a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(ViewGroup.LayoutParams p) { 703a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(p); 704a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 705a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 706a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(MarginLayoutParams source) { 707a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 708a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 709a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 7108f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viverette @RequiresApi(19) 711a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LinearLayout.LayoutParams source) { 7128f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viverette // The copy constructor called here only exists on API 19+. 713a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 714a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 715a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 7168f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viverette @RequiresApi(19) 717a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LayoutParams source) { 7188f886fe8c7e23fe6ccb8734167c960c2ed3429c3Alan Viverette // The copy constructor called here only exists on API 19+. 719a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 720a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = source.mScrollFlags; 721a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = source.mScrollInterpolator; 722a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 723a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 724a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 725a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the scrolling flags. 726a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 727a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param flags bitwise int of {@link #SCROLL_FLAG_SCROLL}, 728bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_EXIT_UNTIL_COLLAPSED}, {@link #SCROLL_FLAG_ENTER_ALWAYS}, 729bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED} and {@link #SCROLL_FLAG_SNAP }. 730a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 731a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollFlags() 732a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 73373e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollFlags 734a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 73550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public void setScrollFlags(@ScrollFlags int flags) { 736a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = flags; 737a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 738a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 739a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 740a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the scrolling flags. 741a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 742a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollFlags(int) 743a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 74473e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollFlags 745a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 74650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @ScrollFlags 747a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public int getScrollFlags() { 748a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollFlags; 749a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 750a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 751a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 752a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the interpolator to when scrolling the view associated with this 753a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. 754a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 755a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param interpolator the interpolator to use, or null to use normal 1-to-1 scrolling. 756a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 75773e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollInterpolator 758a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollInterpolator() 759a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 760a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setScrollInterpolator(Interpolator interpolator) { 761a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = interpolator; 762a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 763a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 764a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 765a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the {@link Interpolator} being used for scrolling the view associated with this 766a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. Null indicates 'normal' 1-to-1 scrolling. 767a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 76873e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollInterpolator 769a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollInterpolator(Interpolator) 770a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 771a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Interpolator getScrollInterpolator() { 772a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollInterpolator; 773a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 7741a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 7751a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes /** 7761a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * Returns true if the scroll flags are compatible for 'collapsing' 7771a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes */ 778657ea1100fee4750f148f9d0dcb7e7e2028f105eAurimas Liutikas boolean isCollapsible() { 7791a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return (mScrollFlags & SCROLL_FLAG_SCROLL) == SCROLL_FLAG_SCROLL 7801a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes && (mScrollFlags & COLLAPSIBLE_FLAGS) != 0; 7811a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 782a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 783a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 784a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 785a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The default {@link Behavior} for {@link AppBarLayout}. Implements the necessary nested 786a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll handling with offsetting. 787a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 788ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class Behavior extends HeaderBehavior<AppBarLayout> { 78957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private static final int MAX_OFFSET_ANIMATION_DURATION = 600; // ms 790e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private static final int INVALID_POSITION = -1; 791e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 79272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 79372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Callback to allow control over any {@link AppBarLayout} dragging. 79472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 79572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public static abstract class DragCallback { 79672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 79772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Allows control over whether the given {@link AppBarLayout} can be dragged or not. 79872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 79972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * <p>Dragging is defined as a direct touch on the AppBarLayout with movement. This 80072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * call does not affect any nested scrolling.</p> 80172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 80272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * @return true if we are in a position to scroll the AppBarLayout via a drag, false 80372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * if not. 80472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 80572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public abstract boolean canDrag(@NonNull AppBarLayout appBarLayout); 80672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 80772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 808e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetDelta; 809ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikas private ValueAnimator mOffsetAnimator; 81050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 811e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetToChildIndexOnLayout = INVALID_POSITION; 812e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private boolean mOffsetToChildIndexOnLayoutIsMinHeight; 813e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private float mOffsetToChildIndexOnLayoutPerc; 814e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 815d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private WeakReference<View> mLastNestedScrollingChildRef; 81672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes private DragCallback mOnDragCallback; 817d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 818a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior() {} 819a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 820a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior(Context context, AttributeSet attrs) { 821a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 822a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 823a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 824a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 825ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes public boolean onStartNestedScroll(CoordinatorLayout parent, AppBarLayout child, 82676daed103193a1756535d1f59b165e98e1d17445Chris Banes View directTargetChild, View target, int nestedScrollAxes, int type) { 827f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // Return true if we're nested scrolling vertically, and we have scrollable children 828f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // and the scrolling view is big enough to scroll 829631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final boolean started = (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0 830f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes && child.hasScrollableChildren() 831ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes && parent.getHeight() - directTargetChild.getHeight() <= child.getHeight(); 832631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 833c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (started && mOffsetAnimator != null) { 834631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Cancel any offset animation 835c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 836631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 837631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 838d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // A new nested scroll has started so clear out the previous ref 839d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = null; 840d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 841631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return started; 842a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 843a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 844a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 845a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 84676daed103193a1756535d1f59b165e98e1d17445Chris Banes View target, int dx, int dy, int[] consumed, int type) { 84776daed103193a1756535d1f59b165e98e1d17445Chris Banes if (dy != 0) { 84850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int min, max; 84950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy < 0) { 85050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling down 85150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getTotalScrollRange(); 85250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = min + child.getDownNestedPreScrollRange(); 85350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 85450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling up 85550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getUpNestedPreScrollRange(); 85650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = 0; 85750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 85876daed103193a1756535d1f59b165e98e1d17445Chris Banes if (min != max) { 85976daed103193a1756535d1f59b165e98e1d17445Chris Banes consumed[1] = scroll(coordinatorLayout, child, dy, min, max); 86076daed103193a1756535d1f59b165e98e1d17445Chris Banes } 861a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 862a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 863a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 864a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 865a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 86676daed103193a1756535d1f59b165e98e1d17445Chris Banes View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed, 86776daed103193a1756535d1f59b165e98e1d17445Chris Banes int type) { 86850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dyUnconsumed < 0) { 86950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If the scrolling view is scrolling down but not consuming, it's probably be at 87050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // the top of it's content 87150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes scroll(coordinatorLayout, child, dyUnconsumed, 87250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes -child.getDownNestedScrollRange(), 0); 873a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 87450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 875a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 87650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Override 877bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout abl, 87876daed103193a1756535d1f59b165e98e1d17445Chris Banes View target, int type) { 87976daed103193a1756535d1f59b165e98e1d17445Chris Banes if (type == ViewCompat.TYPE_TOUCH) { 880bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we haven't been flung then let's see if the current view has been set to snap 881bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes snapToChildIfNeeded(coordinatorLayout, abl); 882bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 883bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 884d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // Keep a reference to the previous nested scrolling child 885d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = new WeakReference<>(target); 886d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 887d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 88872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 88972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Set a callback to control any {@link AppBarLayout} dragging. 89072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 89172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * @param callback the callback to use, or {@code null} to use the default behavior. 89272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 89372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public void setDragCallback(@Nullable DragCallback callback) { 89472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes mOnDragCallback = callback; 89572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 89672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 897631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private void animateOffsetTo(final CoordinatorLayout coordinatorLayout, 89857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final AppBarLayout child, final int offset, float velocity) { 89957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final int distance = Math.abs(getTopBottomOffsetForScrollingSibling() - offset); 90057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 90157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final int duration; 90257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes velocity = Math.abs(velocity); 90357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes if (velocity > 0) { 90457aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes duration = 3 * Math.round(1000 * (distance / velocity)); 90557aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } else { 90657aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final float distanceRatio = (float) distance / child.getHeight(); 90757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes duration = (int) ((distanceRatio + 1) * 150); 90857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } 90957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 91057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetWithDuration(coordinatorLayout, child, offset, duration); 91157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } 91257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 91357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private void animateOffsetWithDuration(final CoordinatorLayout coordinatorLayout, 91457aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final AppBarLayout child, final int offset, final int duration) { 915dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes final int currentOffset = getTopBottomOffsetForScrollingSibling(); 916dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes if (currentOffset == offset) { 917c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (mOffsetAnimator != null && mOffsetAnimator.isRunning()) { 918c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 919dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 920dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes return; 921dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 922dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 923c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (mOffsetAnimator == null) { 924ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikas mOffsetAnimator = new ValueAnimator(); 925c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setInterpolator(AnimationUtils.DECELERATE_INTERPOLATOR); 926ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikas mOffsetAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { 927631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 928ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikas public void onAnimationUpdate(ValueAnimator animation) { 929ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(coordinatorLayout, child, 930ae7189188acb2bc972b08d9fbd59939f341c7829Aurimas Liutikas (int) animation.getAnimatedValue()); 931631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 932631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes }); 933631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 934c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 935631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 936631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 93757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes mOffsetAnimator.setDuration(Math.min(duration, MAX_OFFSET_ANIMATION_DURATION)); 938c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setIntValues(currentOffset, offset); 939c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.start(); 940631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 941631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 942108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes private int getChildIndexOnOffset(AppBarLayout abl, final int offset) { 943bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes for (int i = 0, count = abl.getChildCount(); i < count; i++) { 944bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes View child = abl.getChildAt(i); 945bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (child.getTop() <= -offset && child.getBottom() >= -offset) { 946108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return i; 947bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 948bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 949108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return -1; 950bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 951bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 952bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes private void snapToChildIfNeeded(CoordinatorLayout coordinatorLayout, AppBarLayout abl) { 953bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int offset = getTopBottomOffsetForScrollingSibling(); 954108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int offsetChildIndex = getChildIndexOnOffset(abl, offset); 955108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offsetChildIndex >= 0) { 956108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final View offsetChild = abl.getChildAt(offsetChildIndex); 957bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final LayoutParams lp = (LayoutParams) offsetChild.getLayoutParams(); 958108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int flags = lp.getScrollFlags(); 959108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 960108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if ((flags & LayoutParams.FLAG_SNAP) == LayoutParams.FLAG_SNAP) { 961bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // We're set the snap, so animate the offset to the nearest edge 962108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes int snapTop = -offsetChild.getTop(); 963108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes int snapBottom = -offsetChild.getBottom(); 964108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 965108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offsetChildIndex == abl.getChildCount() - 1) { 966108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If this is the last child, we need to take the top inset into account 967108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom += abl.getTopInset(); 968108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 969dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 970108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (checkFlag(flags, LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED)) { 971108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If the view is set only exit until it is collapsed, we'll abide by that 972108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom += ViewCompat.getMinimumHeight(offsetChild); 973108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } else if (checkFlag(flags, LayoutParams.FLAG_QUICK_RETURN 974108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes | LayoutParams.SCROLL_FLAG_ENTER_ALWAYS)) { 975108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If it's set to always enter collapsed, it actually has two states. We 976108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // select the state and then snap within the state 977108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int seam = snapBottom + ViewCompat.getMinimumHeight(offsetChild); 978108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offset < seam) { 979108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapTop = seam; 980108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } else { 981108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom = seam; 982108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 983dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 984dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 985108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int newOffset = offset < (snapBottom + snapTop) / 2 986108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes ? snapBottom 987108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes : snapTop; 988bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes animateOffsetTo(coordinatorLayout, abl, 98912e0a308d1ab838cb05c395baa6f1251fcbb2363Aurimas Liutikas MathUtils.clamp(newOffset, -abl.getTotalScrollRange(), 0), 0); 990bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 991bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 992bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 993bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 994108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes private static boolean checkFlag(final int flags, final int check) { 995108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return (flags & check) == check; 996108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 997108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 998631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 999bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes public boolean onMeasureChild(CoordinatorLayout parent, AppBarLayout child, 1000bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, 1001bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes int heightUsed) { 1002bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes final CoordinatorLayout.LayoutParams lp = 1003bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes (CoordinatorLayout.LayoutParams) child.getLayoutParams(); 1004bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes if (lp.height == CoordinatorLayout.LayoutParams.WRAP_CONTENT) { 1005bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // If the view is set to wrap on it's height, CoordinatorLayout by default will 1006bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // cap the view at the CoL's height. Since the AppBarLayout can scroll, this isn't 1007bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // what we actually want, so we measure it ourselves with an unspecified spec to 1008bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // allow the child to be larger than it's parent 1009bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes parent.onMeasureChild(child, parentWidthMeasureSpec, widthUsed, 1010bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), heightUsed); 1011bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes return true; 1012bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes } 1013bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes 1014bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // Let the parent handle it as normal 1015bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes return super.onMeasureChild(parent, child, parentWidthMeasureSpec, widthUsed, 1016bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes parentHeightMeasureSpec, heightUsed); 1017bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes } 1018bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes 1019bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes @Override 10209995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public boolean onLayoutChild(CoordinatorLayout parent, AppBarLayout abl, 102150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int layoutDirection) { 10229995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes boolean handled = super.onLayoutChild(parent, abl, layoutDirection); 10239995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 10242bab57ed97f284a8152d180cca796739afa3a71dChris Banes // The priority for for actions here is (first which is true wins): 10252bab57ed97f284a8152d180cca796739afa3a71dChris Banes // 1. forced pending actions 10262bab57ed97f284a8152d180cca796739afa3a71dChris Banes // 2. offsets for restorations 10272bab57ed97f284a8152d180cca796739afa3a71dChris Banes // 3. non-forced pending actions 10289995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int pendingAction = abl.getPendingAction(); 10292bab57ed97f284a8152d180cca796739afa3a71dChris Banes if (mOffsetToChildIndexOnLayout >= 0 && (pendingAction & PENDING_ACTION_FORCE) == 0) { 10302bab57ed97f284a8152d180cca796739afa3a71dChris Banes View child = abl.getChildAt(mOffsetToChildIndexOnLayout); 10312bab57ed97f284a8152d180cca796739afa3a71dChris Banes int offset = -child.getBottom(); 10322bab57ed97f284a8152d180cca796739afa3a71dChris Banes if (mOffsetToChildIndexOnLayoutIsMinHeight) { 10332bab57ed97f284a8152d180cca796739afa3a71dChris Banes offset += ViewCompat.getMinimumHeight(child) + abl.getTopInset(); 10342bab57ed97f284a8152d180cca796739afa3a71dChris Banes } else { 10352bab57ed97f284a8152d180cca796739afa3a71dChris Banes offset += Math.round(child.getHeight() * mOffsetToChildIndexOnLayoutPerc); 10362bab57ed97f284a8152d180cca796739afa3a71dChris Banes } 10372bab57ed97f284a8152d180cca796739afa3a71dChris Banes setHeaderTopBottomOffset(parent, abl, offset); 10382bab57ed97f284a8152d180cca796739afa3a71dChris Banes } else if (pendingAction != PENDING_ACTION_NONE) { 10399995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final boolean animate = (pendingAction & PENDING_ACTION_ANIMATE_ENABLED) != 0; 10409995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if ((pendingAction & PENDING_ACTION_COLLAPSED) != 0) { 10419995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int offset = -abl.getUpNestedPreScrollRange(); 10429995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 104357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(parent, abl, offset, 0); 10449995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 1045ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, offset); 10469995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10479995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if ((pendingAction & PENDING_ACTION_EXPANDED) != 0) { 10489995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 104957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(parent, abl, 0, 0); 10509995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 1051ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, 0); 10529995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10539995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 1054e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 105550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 105679aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes // Finally reset any pending states 105779aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes abl.resetPendingAction(); 105879aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 105979aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes 106047543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // We may have changed size, so let's constrain the top and bottom offset correctly, 106147543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // just in case we're out of the bounds 106247543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes setTopAndBottomOffset( 106312e0a308d1ab838cb05c395baa6f1251fcbb2363Aurimas Liutikas MathUtils.clamp(getTopAndBottomOffset(), -abl.getTotalScrollRange(), 0)); 106447543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes 1065df2d45b76203a9c4101629005eb27059d7f80297Chris Banes // Update the AppBarLayout's drawable state for any elevation changes. 1066df2d45b76203a9c4101629005eb27059d7f80297Chris Banes // This is needed so that the elevation is set in the first layout, so that 1067df2d45b76203a9c4101629005eb27059d7f80297Chris Banes // we don't get a visual elevation jump pre-N (due to the draw dispatch skip) 1068df2d45b76203a9c4101629005eb27059d7f80297Chris Banes updateAppBarLayoutDrawableState(parent, abl, getTopAndBottomOffset(), 0, true); 1069df2d45b76203a9c4101629005eb27059d7f80297Chris Banes 10701a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Make sure we dispatch the offset update 10711a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes abl.dispatchOffsetUpdates(getTopAndBottomOffset()); 107250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 107350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return handled; 1074a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1075a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 107672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 107772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes boolean canDragView(AppBarLayout view) { 107872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes if (mOnDragCallback != null) { 107972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // If there is a drag callback set, it's in control 108072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return mOnDragCallback.canDrag(view); 108172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 108272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 108372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // Else we'll use the default behaviour of seeing if it can scroll down 1084d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mLastNestedScrollingChildRef != null) { 108572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // If we have a reference to a scrolling view, check it 108672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes final View scrollingView = mLastNestedScrollingChildRef.get(); 108772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return scrollingView != null && scrollingView.isShown() 108872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes && !ViewCompat.canScrollVertically(scrollingView, -1); 108972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } else { 109072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // Otherwise we assume that the scrolling view hasn't been scrolled and can drag. 109172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return true; 1092d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1093d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1094d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 1095ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 109647543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes void onFlingFinished(CoordinatorLayout parent, AppBarLayout layout) { 109747543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // At the end of a manual fling, check to see if we need to snap to the edge-child 109847543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes snapToChildIfNeeded(parent, layout); 109947543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes } 110047543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes 110147543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes @Override 110272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getMaxDragOffset(AppBarLayout view) { 110372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return -view.getDownNestedScrollRange(); 110472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 110572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 110672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 110772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getScrollRangeForDragFling(AppBarLayout view) { 110872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return view.getTotalScrollRange(); 110972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 111072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 111172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 111272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int setHeaderTopBottomOffset(CoordinatorLayout coordinatorLayout, 1113bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes AppBarLayout appBarLayout, int newOffset, int minOffset, int maxOffset) { 1114e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int curOffset = getTopBottomOffsetForScrollingSibling(); 1115a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int consumed = 0; 1116a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 11175e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes if (minOffset != 0 && curOffset >= minOffset && curOffset <= maxOffset) { 1118631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we have some scrolling range, and we're currently within the min and max 1119631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // offsets, calculate a new offset 112012e0a308d1ab838cb05c395baa6f1251fcbb2363Aurimas Liutikas newOffset = MathUtils.clamp(newOffset, minOffset, maxOffset); 1121a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (curOffset != newOffset) { 1122e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int interpolatedOffset = appBarLayout.hasChildWithInterpolator() 1123e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ? interpolateOffset(appBarLayout, newOffset) 1124e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes : newOffset; 1125e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 11261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final boolean offsetChanged = setTopAndBottomOffset(interpolatedOffset); 1127631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 1128a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update how much dy we have consumed 1129a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes consumed = curOffset - newOffset; 1130a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update the stored sibling offset 1131e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetDelta = newOffset - interpolatedOffset; 1132a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1133a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (!offsetChanged && appBarLayout.hasChildWithInterpolator()) { 1134a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If the offset hasn't changed and we're using an interpolated scroll 1135a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // then we need to keep any dependent views updated. CoL will do this for 1136a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us when we move, but we need to do it manually when we don't (as an 1137a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // interpolated scroll may finish early). 1138a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes coordinatorLayout.dispatchDependentViewsChanged(appBarLayout); 1139a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1140a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1141631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Dispatch the updates to any listeners 11421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes appBarLayout.dispatchOffsetUpdates(getTopAndBottomOffset()); 11431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 11441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Update the AppBarLayout's drawable state (for any elevation changes) 1145c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes updateAppBarLayoutDrawableState(coordinatorLayout, appBarLayout, newOffset, 1146df2d45b76203a9c4101629005eb27059d7f80297Chris Banes newOffset < curOffset ? -1 : 1, false); 1147a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 11485e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes } else { 11495e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // Reset the offset delta 11505e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes mOffsetDelta = 0; 1151a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1152a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1153a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return consumed; 1154a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1155a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1156bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes @VisibleForTesting 1157bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes boolean isOffsetAnimatorRunning() { 1158bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes return mOffsetAnimator != null && mOffsetAnimator.isRunning(); 1159bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes } 1160bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes 1161a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int interpolateOffset(AppBarLayout layout, final int offset) { 1162a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int absOffset = Math.abs(offset); 1163a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1164a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 1165a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = layout.getChildAt(i); 1166a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 116750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 1168a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 116950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 1170a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 117150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int childScrollableHeight = 0; 117250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int flags = childLp.getScrollFlags(); 117350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 1174b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // We're set to scroll so add the child's height plus margin 1175b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childScrollableHeight += child.getHeight() + childLp.topMargin 1176b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes + childLp.bottomMargin; 1177b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes 117850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 1179b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // For a collapsing scroll, we to take the collapsed height 1180b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // into account. 118150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes childScrollableHeight -= ViewCompat.getMinimumHeight(child); 118250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 118350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 118450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1185ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (ViewCompat.getFitsSystemWindows(child)) { 1186ea004a01f44aaf36212120c936952c1742d03d30Chris Banes childScrollableHeight -= layout.getTopInset(); 1187ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1188ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 118950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (childScrollableHeight > 0) { 119050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int offsetForView = absOffset - child.getTop(); 119150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int interpolatedDiff = Math.round(childScrollableHeight * 119250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes interpolator.getInterpolation( 119350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes offsetForView / (float) childScrollableHeight)); 119450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 119550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return Integer.signum(offset) * (child.getTop() + interpolatedDiff); 119650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 1197a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 119850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 119950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If we get to here then the view on the offset isn't suitable for interpolated 120050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // scrolling. So break out of the loop 120150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes break; 1202a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1203a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1204a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1205a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return offset; 1206a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1207a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1208c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes private void updateAppBarLayoutDrawableState(final CoordinatorLayout parent, 1209df2d45b76203a9c4101629005eb27059d7f80297Chris Banes final AppBarLayout layout, final int offset, final int direction, 1210df2d45b76203a9c4101629005eb27059d7f80297Chris Banes final boolean forceJump) { 12111a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final View child = getAppBarChildOnOffset(layout, offset); 12121a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (child != null) { 12131a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 12141a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int flags = childLp.getScrollFlags(); 12151a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes boolean collapsed = false; 12161a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12171a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 12181a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int minHeight = ViewCompat.getMinimumHeight(child); 12191a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12201a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (direction > 0 && (flags & (LayoutParams.SCROLL_FLAG_ENTER_ALWAYS 12211a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes | LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED)) != 0) { 12221a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // We're set to enter always collapsed so we are only collapsed when 12231a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // being scrolled down, and in a collapsed offset 12241a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes collapsed = -offset >= child.getBottom() - minHeight - layout.getTopInset(); 12251a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 12261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // We're set to exit until collapsed, so any offset which results in 12271a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // the minimum height (or less) being shown is collapsed 12281a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes collapsed = -offset >= child.getBottom() - minHeight - layout.getTopInset(); 12291a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12311a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1232c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final boolean changed = layout.setCollapsedState(collapsed); 1233c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes 1234df2d45b76203a9c4101629005eb27059d7f80297Chris Banes if (Build.VERSION.SDK_INT >= 11 && (forceJump 1235df2d45b76203a9c4101629005eb27059d7f80297Chris Banes || (changed && shouldJumpElevationState(parent, layout)))) { 1236c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // If the collapsed state changed, we may need to 1237c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // jump to the current state if we have an overlapping view 1238c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes layout.jumpDrawablesToCurrentState(); 1239c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 1240c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 1241c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 1242c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes 1243c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes private boolean shouldJumpElevationState(CoordinatorLayout parent, AppBarLayout layout) { 1244c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // We should jump the elevated state if we have a dependent scrolling view which has 1245c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes // an overlapping top (i.e. overlaps us) 1246c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final List<View> dependencies = parent.getDependents(layout); 1247c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes for (int i = 0, size = dependencies.size(); i < size; i++) { 1248c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final View dependency = dependencies.get(i); 1249c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final CoordinatorLayout.LayoutParams lp = 1250c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes (CoordinatorLayout.LayoutParams) dependency.getLayoutParams(); 1251c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes final CoordinatorLayout.Behavior behavior = lp.getBehavior(); 1252c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes 1253c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes if (behavior instanceof ScrollingViewBehavior) { 1254c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return ((ScrollingViewBehavior) behavior).getOverlayTop() != 0; 1255c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes } 12561a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 1257c07c8e1e74a026c0d9e3a9dd119913436380be38Chris Banes return false; 12581a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private static View getAppBarChildOnOffset(final AppBarLayout layout, final int offset) { 12611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int absOffset = Math.abs(offset); 12621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 12631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final View child = layout.getChildAt(i); 12641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 12651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return child; 12661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12671a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12681a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return null; 12691a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12701a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1271ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 127272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getTopBottomOffsetForScrollingSibling() { 1273e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return getTopAndBottomOffset() + mOffsetDelta; 1274e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1275e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1276e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1277824644fc70d5fd36bcd4c1e155c1279aebcac007Chris Banes public Parcelable onSaveInstanceState(CoordinatorLayout parent, AppBarLayout abl) { 1278824644fc70d5fd36bcd4c1e155c1279aebcac007Chris Banes final Parcelable superState = super.onSaveInstanceState(parent, abl); 1279e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int offset = getTopAndBottomOffset(); 1280e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1281e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Try and find the first visible child... 1282824644fc70d5fd36bcd4c1e155c1279aebcac007Chris Banes for (int i = 0, count = abl.getChildCount(); i < count; i++) { 1283824644fc70d5fd36bcd4c1e155c1279aebcac007Chris Banes View child = abl.getChildAt(i); 1284e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int visBottom = child.getBottom() + offset; 1285e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1286e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (child.getTop() + offset <= 0 && visBottom >= 0) { 1287e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = new SavedState(superState); 1288e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibleChildIndex = i; 1289c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas ss.firstVisibleChildAtMinimumHeight = 1290824644fc70d5fd36bcd4c1e155c1279aebcac007Chris Banes visBottom == (ViewCompat.getMinimumHeight(child) + abl.getTopInset()); 1291c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas ss.firstVisibleChildPercentageShown = visBottom / (float) child.getHeight(); 1292e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return ss; 1293e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1294e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1295e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1296e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Else we'll just return the super state 1297e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return superState; 1298e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1299e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1300e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1301e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void onRestoreInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout, 1302e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes Parcelable state) { 1303e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (state instanceof SavedState) { 1304e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = (SavedState) state; 1305e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, ss.getSuperState()); 1306e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = ss.firstVisibleChildIndex; 1307c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas mOffsetToChildIndexOnLayoutPerc = ss.firstVisibleChildPercentageShown; 1308c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas mOffsetToChildIndexOnLayoutIsMinHeight = ss.firstVisibleChildAtMinimumHeight; 1309e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 1310e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, state); 1311e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 1312e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1313e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1314e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 131505f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banes protected static class SavedState extends AbsSavedState { 1316e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int firstVisibleChildIndex; 1317c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas float firstVisibleChildPercentageShown; 1318c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas boolean firstVisibleChildAtMinimumHeight; 1319e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 132062ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes public SavedState(Parcel source, ClassLoader loader) { 132105f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banes super(source, loader); 1322e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibleChildIndex = source.readInt(); 1323c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas firstVisibleChildPercentageShown = source.readFloat(); 1324c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas firstVisibleChildAtMinimumHeight = source.readByte() != 0; 1325e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1326e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1327e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState(Parcelable superState) { 1328e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super(superState); 1329e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1330e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1331e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1332e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void writeToParcel(Parcel dest, int flags) { 1333e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.writeToParcel(dest, flags); 1334e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeInt(firstVisibleChildIndex); 1335c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas dest.writeFloat(firstVisibleChildPercentageShown); 1336c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas dest.writeByte((byte) (firstVisibleChildAtMinimumHeight ? 1 : 0)); 1337e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1338e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 13394b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas public static final Creator<SavedState> CREATOR = new ClassLoaderCreator<SavedState>() { 13404b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas @Override 13414b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas public SavedState createFromParcel(Parcel source, ClassLoader loader) { 13424b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas return new SavedState(source, loader); 13434b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas } 1344e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 13454b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas @Override 13464b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas public SavedState createFromParcel(Parcel source) { 13474b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas return new SavedState(source, null); 13484b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas } 13494b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas 13504b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas @Override 13514b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas public SavedState[] newArray(int size) { 13524b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas return new SavedState[size]; 13534b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas } 13544b25d63ff53d4676150ac54897851e4ff9f1049fAurimas Liutikas }; 1355a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1356a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1357a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1358a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1359a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Behavior which should be used by {@link View}s which can scroll vertically and support 1360a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * nested scrolling to automatically scroll any {@link AppBarLayout} siblings. 1361a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1362ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class ScrollingViewBehavior extends HeaderScrollingViewBehavior { 1363a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1364a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior() {} 1365a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1366a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior(Context context, AttributeSet attrs) { 1367a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 1368a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1369b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final TypedArray a = context.obtainStyledAttributes(attrs, 137073e7a06fb66110495fa4e98a91831a47feab2526Chris Banes R.styleable.ScrollingViewBehavior_Layout); 1371b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes setOverlayTop(a.getDimensionPixelSize( 137273e7a06fb66110495fa4e98a91831a47feab2526Chris Banes R.styleable.ScrollingViewBehavior_Layout_behavior_overlapTop, 0)); 1373a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 1374a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1375a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1376a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1377a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) { 1378a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We depend on any AppBarLayouts 1379a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return dependency instanceof AppBarLayout; 1380a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1381a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1382a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1383a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean onDependentViewChanged(CoordinatorLayout parent, View child, 1384a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View dependency) { 13855e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes offsetChildAsNeeded(parent, child, dependency); 13860d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return false; 13870d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 13880d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 138900a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes @Override 13904cf1d92509224fab3ca69b419a005c536ab75c5cChris Banes public boolean onRequestChildRectangleOnScreen(CoordinatorLayout parent, View child, 139100a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes Rect rectangle, boolean immediate) { 139200a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes final AppBarLayout header = findFirstDependency(parent.getDependencies(child)); 139300a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes if (header != null) { 139400a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes // Offset the rect by the child's left/top 139500a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes rectangle.offset(child.getLeft(), child.getTop()); 139600a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes 139700a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes final Rect parentRect = mTempRect1; 139800a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes parentRect.set(0, 0, parent.getWidth(), parent.getHeight()); 139900a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes 140000a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes if (!parentRect.contains(rectangle)) { 140100a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes // If the rectangle can not be fully seen the visible bounds, collapse 140200a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes // the AppBarLayout 140300a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes header.setExpanded(false, !immediate); 140400a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes return true; 140500a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes } 140600a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes } 140700a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes return false; 140800a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes } 140900a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes 14105e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes private void offsetChildAsNeeded(CoordinatorLayout parent, View child, View dependency) { 1411a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final CoordinatorLayout.Behavior behavior = 1412a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes ((CoordinatorLayout.LayoutParams) dependency.getLayoutParams()).getBehavior(); 1413a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (behavior instanceof Behavior) { 14145e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // Offset the child, pinning it to the bottom the header-dependency, maintaining 1415bb3740d273d4b5108ab63f6d264466250a197e5bChris Banes // any vertical gap and overlap 14165e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes final Behavior ablBehavior = (Behavior) behavior; 1417318baf84dade07174d71e10322e3b10ab4b0c28cChris Banes ViewCompat.offsetTopAndBottom(child, (dependency.getBottom() - child.getTop()) 14185e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes + ablBehavior.mOffsetDelta 14195e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes + getVerticalLayoutGap() 1420b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes - getOverlapPixelsForOffset(dependency)); 1421ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1422ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1423ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 1424b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes @Override 1425b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes float getOverlapRatioForOffset(final View header) { 1426b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes if (header instanceof AppBarLayout) { 1427b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final AppBarLayout abl = (AppBarLayout) header; 1428ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int totalScrollRange = abl.getTotalScrollRange(); 1429ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int preScrollDown = abl.getDownNestedPreScrollRange(); 1430b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final int offset = getAppBarLayoutOffset(abl); 1431a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1432ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (preScrollDown != 0 && (totalScrollRange + offset) <= preScrollDown) { 1433ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // If we're in a pre-scroll down. Don't use the offset at all. 1434ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return 0; 1435a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 1436ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int availScrollRange = totalScrollRange - preScrollDown; 1437dfb857dd12b359c0bdae11a23e039f286d54dc0aChris Banes if (availScrollRange != 0) { 1438ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Else we'll use a interpolated ratio of the overlap, depending on offset 1439b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 1f + (offset / (float) availScrollRange); 1440ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1441a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1442a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1443b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 0f; 1444a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1445a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1446b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes private static int getAppBarLayoutOffset(AppBarLayout abl) { 1447b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final CoordinatorLayout.Behavior behavior = 1448b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes ((CoordinatorLayout.LayoutParams) abl.getLayoutParams()).getBehavior(); 1449b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes if (behavior instanceof Behavior) { 1450b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return ((Behavior) behavior).getTopBottomOffsetForScrollingSibling(); 1451b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes } 1452b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 0; 1453a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1454a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1455ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 145600a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes AppBarLayout findFirstDependency(List<View> views) { 1457a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = views.size(); i < z; i++) { 1458a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View view = views.get(i); 1459a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (view instanceof AppBarLayout) { 146000a00a7d3ba8279294f63994473afc32e05dcf10Chris Banes return (AppBarLayout) view; 1461a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1462a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1463a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return null; 1464a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1465ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor 1466ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 146772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getScrollRange(View v) { 1468ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor if (v instanceof AppBarLayout) { 1469ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return ((AppBarLayout) v).getTotalScrollRange(); 1470ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } else { 1471ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return super.getScrollRange(v); 1472ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1473ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1474a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1475a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes} 1476