AppBarLayout.java revision ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3c
1a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes/* 2a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Copyright (C) 2015 The Android Open Source Project 3a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 4a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Licensed under the Apache License, Version 2.0 (the "License"); 5a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * you may not use this file except in compliance with the License. 6a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * You may obtain a copy of the License at 7a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 8a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * http://www.apache.org/licenses/LICENSE-2.0 9a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 10a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Unless required by applicable law or agreed to in writing, software 11a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * distributed under the License is distributed on an "AS IS" BASIS, 12a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * See the License for the specific language governing permissions and 14a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * limitations under the License. 15a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 16a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 17a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banespackage android.support.design.widget; 18a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 19a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.content.Context; 20a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.content.res.TypedArray; 21e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banesimport android.os.Parcel; 22e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banesimport android.os.Parcelable; 2350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport android.support.annotation.IntDef; 24a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.support.design.R; 25d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport android.support.v4.view.MotionEventCompat; 26a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.support.v4.view.ViewCompat; 276ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banesimport android.support.v4.view.WindowInsetsCompat; 28a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.util.AttributeSet; 29d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport android.view.MotionEvent; 30a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.View; 31d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport android.view.ViewConfiguration; 32a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.ViewGroup; 33a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.animation.Interpolator; 34a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.widget.LinearLayout; 35a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 3650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.Retention; 3750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.RetentionPolicy; 38d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport java.lang.ref.WeakReference; 39631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banesimport java.util.ArrayList; 40a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport java.util.List; 41a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 42a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes/** 43a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * AppBarLayout is a vertical {@link LinearLayout} which implements many of the features of 449fb154338a62edc2c57dc036895199d6f1769400Chris Banes * material designs app bar concept, namely scrolling gestures. 45a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 46a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Children should provide their desired scrolling behavior through 47a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams#setScrollFlags(int)} and the associated layout xml attribute: 48a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@code app:layout_scrollFlags}. 49a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 50a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 51a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * This view depends heavily on being used as a direct child within a {@link CoordinatorLayout}. 52a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * If you use AppBarLayout within a different {@link ViewGroup}, most of it's functionality will 53a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * not work. 54a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 559fb154338a62edc2c57dc036895199d6f1769400Chris Banes * AppBarLayout also requires a separate scrolling sibling in order to know when to scroll. 569fb154338a62edc2c57dc036895199d6f1769400Chris Banes * The binding is done through the {@link ScrollingViewBehavior} behavior class, meaning that you 579fb154338a62edc2c57dc036895199d6f1769400Chris Banes * should set your scrolling view's behavior to be an instance of {@link ScrollingViewBehavior}. 589fb154338a62edc2c57dc036895199d6f1769400Chris Banes * A string resource containing the full class name is available. 59a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 60a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <pre> 61a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.CoordinatorLayout 62a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:android="http://schemas.android.com/apk/res/android" 63a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:app="http://schemas.android.com/apk/res-auto" 64a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 65a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent"> 66a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 67a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v4.widget.NestedScrollView 68a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 69a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent" 70a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_behavior="@string/appbar_scrolling_view_behavior"> 71a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 72a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <!-- Your scrolling content --> 73a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 74a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.v4.widget.NestedScrollView> 75a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 76a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.AppBarLayout 77a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="wrap_content" 78a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent"> 79a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 80a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v7.widget.Toolbar 81a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 82a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 83a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 84a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.TabLayout 85a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 86a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 87a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 88a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.AppBarLayout> 89a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 90a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.CoordinatorLayout> 91a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </pre> 92a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 93a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see <a href="http://www.google.com/design/spec/layout/structure.html#structure-app-bar"> 94a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * http://www.google.com/design/spec/layout/structure.html#structure-app-bar</a> 95a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 96a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes@CoordinatorLayout.DefaultBehavior(AppBarLayout.Behavior.class) 97a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banespublic class AppBarLayout extends LinearLayout { 98a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 999995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_NONE = 0x0; 1009995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_EXPANDED = 0x1; 1019995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_COLLAPSED = 0x2; 1029995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_ANIMATE_ENABLED = 0x4; 1039995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 104a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 105631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Interface definition for a callback to be invoked when an {@link AppBarLayout}'s vertical 106631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * offset changes. 107a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 108631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public interface OnOffsetChangedListener { 109a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 110a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Called when the {@link AppBarLayout}'s layout offset has been changed. This allows 111a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * child views to implement custom behavior based on the offset (for instance pinning a 112a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * view at a certain y value). 113a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 114631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param appBarLayout the {@link AppBarLayout} which offset has changed 11550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes * @param verticalOffset the vertical offset for the parent {@link AppBarLayout}, in px 116a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 117631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset); 118a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 119a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 120a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private static final int INVALID_SCROLL_RANGE = -1; 121a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 122a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mTotalScrollRange = INVALID_SCROLL_RANGE; 123a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownPreScrollRange = INVALID_SCROLL_RANGE; 124a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownScrollRange = INVALID_SCROLL_RANGE; 125a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 126a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes boolean mHaveChildWithInterpolator; 127a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 12850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes private float mTargetElevation; 12950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1309995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private int mPendingAction = PENDING_ACTION_NONE; 1319995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 1326ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes private WindowInsetsCompat mLastInsets; 1336ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 1346f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes private final List<OnOffsetChangedListener> mListeners; 135631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 136a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context) { 137a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes this(context, null); 138a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 139a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 140a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context, AttributeSet attrs) { 141a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 142a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes setOrientation(VERTICAL); 14350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 144809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes ThemeUtils.checkAppCompatTheme(context); 145809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes 14650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AppBarLayout, 14750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 0, R.style.Widget_Design_AppBarLayout); 14850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mTargetElevation = a.getDimensionPixelSize(R.styleable.AppBarLayout_elevation, 0); 14981520564f3dd783136e025174021ba4eabd6ff3cChris Banes setBackgroundDrawable(a.getDrawable(R.styleable.AppBarLayout_android_background)); 1509995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (a.hasValue(R.styleable.AppBarLayout_expanded)) { 1519995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(a.getBoolean(R.styleable.AppBarLayout_expanded, false)); 1529995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 15350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes a.recycle(); 15450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 15550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Use the bounds view outline provider so that we cast a shadow, even without a background 15650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes ViewUtils.setBoundsViewOutlineProvider(this); 157631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 158631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mListeners = new ArrayList<>(); 159631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 160631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes ViewCompat.setElevation(this, mTargetElevation); 1616ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 1626ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes ViewCompat.setOnApplyWindowInsetsListener(this, 1636ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes new android.support.v4.view.OnApplyWindowInsetsListener() { 1646ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes @Override 1656ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public WindowInsetsCompat onApplyWindowInsets(View v, 1666ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes WindowInsetsCompat insets) { 1676ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes setWindowInsets(insets); 1686ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes return insets.consumeSystemWindowInsets(); 1696ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 1706ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes }); 171631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 172631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 173631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 174631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Add a listener that will be called when the offset of this {@link AppBarLayout} changes. 175631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 176631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener The listener that will be called when the offset changes.] 177631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 178631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @see #removeOnOffsetChangedListener(OnOffsetChangedListener) 179631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 180631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void addOnOffsetChangedListener(OnOffsetChangedListener listener) { 1816f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes if (listener != null && !mListeners.contains(listener)) { 1826f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.add(listener); 183631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 184631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 185631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 186631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 187631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Remove the previously added {@link OnOffsetChangedListener}. 188631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 189631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener the listener to remove. 190631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 191631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void removeOnOffsetChangedListener(OnOffsetChangedListener listener) { 1926f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes if (listener != null) { 1936f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.remove(listener); 194631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 195a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 196a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 197a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 198ea004a01f44aaf36212120c936952c1742d03d30Chris Banes protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 199ea004a01f44aaf36212120c936952c1742d03d30Chris Banes super.onMeasure(widthMeasureSpec, heightMeasureSpec); 200ea004a01f44aaf36212120c936952c1742d03d30Chris Banes invalidateScrollRanges(); 201ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 202ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 203ea004a01f44aaf36212120c936952c1742d03d30Chris Banes @Override 204a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected void onLayout(boolean changed, int l, int t, int r, int b) { 205a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.onLayout(changed, l, t, r, b); 20679aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes invalidateScrollRanges(); 207a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 208a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = false; 209a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 210a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 211a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 212a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 213a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 214a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 215a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = true; 216a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 217a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 218a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 219a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 220a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 221ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void invalidateScrollRanges() { 222ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Invalidate the scroll ranges 223ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mTotalScrollRange = INVALID_SCROLL_RANGE; 224ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownPreScrollRange = INVALID_SCROLL_RANGE; 225ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownScrollRange = INVALID_SCROLL_RANGE; 226ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 227ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 228a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 229a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setOrientation(int orientation) { 230a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (orientation != VERTICAL) { 231a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes throw new IllegalArgumentException("AppBarLayout is always vertical and does" 232a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes + " not support horizontal orientation"); 233a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 234a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.setOrientation(orientation); 235a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 236a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 2379995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2389995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not, animating if it has already 2399995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * been laid out. 2409995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2419995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2429995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2439995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2449995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2459995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2469995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2479995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2489995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2499995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded) { 2509995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(expanded, ViewCompat.isLaidOut(this)); 2519995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 2529995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 2539995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2549995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not. 2559995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2569995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2579995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2589995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2599995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2609995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2619995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param animate Whether to animate to the new state 2629995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2639995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2649995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2659995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded, boolean animate) { 2669995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = (expanded ? PENDING_ACTION_EXPANDED : PENDING_ACTION_COLLAPSED) 2679995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes | (animate ? PENDING_ACTION_ANIMATE_ENABLED : 0); 2689995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes requestLayout(); 2699995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 2709995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 271a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 272a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 273a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return p instanceof LayoutParams; 274a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 275a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 276a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 277a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateDefaultLayoutParams() { 278a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 279a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 280a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 281a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 282a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams generateLayoutParams(AttributeSet attrs) { 283a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(getContext(), attrs); 284a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 285a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 286a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 287a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 288a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (p instanceof LinearLayout.LayoutParams) { 289a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((LinearLayout.LayoutParams) p); 290a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (p instanceof MarginLayoutParams) { 291a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((MarginLayoutParams) p); 292a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 293a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(p); 294a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 295a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 296ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private boolean hasChildWithInterpolator() { 297a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mHaveChildWithInterpolator; 298a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 299a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 300a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 3016ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes * Returns the scroll range of all children. 302a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 303a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @return the scroll range in px 304a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 3056ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public final int getTotalScrollRange() { 306a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mTotalScrollRange != INVALID_SCROLL_RANGE) { 307a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mTotalScrollRange; 308a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 309a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 310a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 311a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 312a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 313a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 314ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 315a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 316a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 317a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 318a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 319b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += childHeight + lp.topMargin + lp.bottomMargin; 320a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 321a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 322a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing scroll, we to take the collapsed height into account. 3236ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // We also break straight away since later views can't scroll beneath 324a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us 3256ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes range -= ViewCompat.getMinimumHeight(child); 3266ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes break; 327a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 328a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 329a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 330a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 331a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 332a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 333a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 334ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mTotalScrollRange = (range - getTopInset()); 335a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 336a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 337ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private boolean hasScrollableChildren() { 338a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return getTotalScrollRange() != 0; 339a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 340a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 341a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 342a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling up from a nested pre-scroll. 343a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 344ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getUpNestedPreScrollRange() { 34550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return getTotalScrollRange(); 346a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 347a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 348a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 349a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested pre-scroll. 350a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 351ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getDownNestedPreScrollRange() { 352a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownPreScrollRange != INVALID_SCROLL_RANGE) { 353a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 354a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownPreScrollRange; 355a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 356a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 357a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 358a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = getChildCount() - 1; i >= 0; i--) { 359a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 360a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 361ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 362a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 363a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 364a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.FLAG_QUICK_RETURN) == LayoutParams.FLAG_QUICK_RETURN) { 365b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // First take the margin into account 366b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += lp.topMargin + lp.bottomMargin; 367a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // The view has the quick return flag combination... 368a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED) != 0) { 369a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If they're set to enter collapsed, use the minimum height 370a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += ViewCompat.getMinimumHeight(child); 371a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 372a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Else use the full height 373a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 374a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 375a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (range > 0) { 376a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we've hit an non-quick return scrollable view, and we've already hit a 377a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // quick return view, return now 378a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 379a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 380a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 381a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownPreScrollRange = range; 382a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 383a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 384a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 385a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested scroll. 386a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 387ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getDownNestedScrollRange() { 388a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownScrollRange != INVALID_SCROLL_RANGE) { 389a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 390a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownScrollRange; 391a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 392a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 393a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 394c1ce4f6cf4d99d6856c4259bf1bb1cb56f604737Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 395a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 396a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 397ea004a01f44aaf36212120c936952c1742d03d30Chris Banes int childHeight = child.getMeasuredHeight(); 398b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childHeight += lp.topMargin + lp.bottomMargin; 399a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 400a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 401a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 402a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 403a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 404a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 405a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 406a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 407a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing exit scroll, we to take the collapsed height into account. 408a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We also return the range straight away since later views can't scroll 409a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // beneath us 410ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mDownScrollRange = (range - ViewCompat.getMinimumHeight(child)); 411a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 412a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 413a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 414a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 415a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 416a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 417a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 418a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownScrollRange = range; 419a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 420a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 42150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int getMinimumHeightForVisibleOverlappingContent() { 4226ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes final int topInset = mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0; 42350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int minHeight = ViewCompat.getMinimumHeight(this); 42450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (minHeight != 0) { 42550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If this layout has a min height, use it (doubled) 4266ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes return (minHeight * 2) + topInset; 42750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 42850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 42950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Otherwise, we'll use twice the min height of our last child 43050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int childCount = getChildCount(); 43150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return childCount >= 1 4326ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes ? (ViewCompat.getMinimumHeight(getChildAt(childCount - 1)) * 2) + topInset 43350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes : 0; 43450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 43550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 43650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** 437631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Set the elevation value to use when this {@link AppBarLayout} should be elevated 438631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * above content. 439631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * <p> 440631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * This method does not do anything itself. A typical use for this method is called from within 441631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * an {@link OnOffsetChangedListener} when the offset has changed in such a way to require an 442631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * elevation change. 443631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 444631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param elevation the elevation value to use. 445631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 446631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @see ViewCompat#setElevation(View, float) 44750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes */ 448631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void setTargetElevation(float elevation) { 449631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mTargetElevation = elevation; 450631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 451631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 452631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 453631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Returns the elevation value to use when this {@link AppBarLayout} should be elevated 454631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * above content. 455631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 456631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public float getTargetElevation() { 45750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return mTargetElevation; 45850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 45950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 460ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getPendingAction() { 4619995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes return mPendingAction; 4629995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 4639995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 464ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void resetPendingAction() { 4659995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = PENDING_ACTION_NONE; 4669995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 4679995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 468ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getTopInset() { 469ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0; 470ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 471ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 4726ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes private void setWindowInsets(WindowInsetsCompat insets) { 4736ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // Invalidate the total scroll range... 4746ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes mTotalScrollRange = INVALID_SCROLL_RANGE; 4756ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes mLastInsets = insets; 4766ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 4776ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // Now dispatch them to our children 4786ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 4796ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes final View child = getChildAt(i); 4806ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes insets = ViewCompat.dispatchApplyWindowInsets(child, insets); 4816ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes if (insets.isConsumed()) { 4826ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes break; 4836ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 4846ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 4856ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 4866ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 487a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static class LayoutParams extends LinearLayout.LayoutParams { 48850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 48950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** @hide */ 49050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @IntDef(flag=true, value={ 49150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_SCROLL, 49250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_EXIT_UNTIL_COLLAPSED, 49350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_ENTER_ALWAYS, 494bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED, 495bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_SNAP 49650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes }) 49750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Retention(RetentionPolicy.SOURCE) 49850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public @interface ScrollFlags {} 49950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 500a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 501a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The view will be scroll in direct relation to scroll events. This flag needs to be 502a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * set for any of the other flags to take effect. If any sibling views 503a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * before this one do not have this flag, then this value has no effect. 504a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 505a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_SCROLL = 0x1; 506a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 507a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 508a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When exiting (scrolling off screen) the view will be scrolled until it is 509a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 'collapsed'. The collapsed height is defined by the view's minimum height. 510a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 511a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 512a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 513a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 514a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_EXIT_UNTIL_COLLAPSED = 0x2; 515a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 516a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 517a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When entering (scrolling on screen) the view will scroll on any downwards 518a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll event, regardless of whether the scrolling view is also scrolling. This 519a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * is commonly referred to as the 'quick return' pattern. 520a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 521a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS = 0x4; 522a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 523a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 524a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * An additional flag for 'enterAlways' which modifies the returning view to 525a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * only initially scroll back to it's collapsed height. Once the scrolling view has 526a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * reached the end of it's scroll range, the remainder of this view will be scrolled 527a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * into view. The collapsed height is defined by the view's minimum height. 528a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 529a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 530a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 531a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 532a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED = 0x8; 533a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 534a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 535bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Upon a scroll ending, if the view is only partially visible then it will be snapped 536bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * and scrolled to it's closest edge. For example, if the view only has it's bottom 25% 537bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * displayed, it will be scrolled off screen completely. Conversely, if it's bottom 75% 538bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * is visible then it will be scrolled fully into view. 539bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes */ 540bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public static final int SCROLL_FLAG_SNAP = 0x10; 541bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 542bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes /** 543bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Internal flags which allows quick checking features 544a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 545a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes static final int FLAG_QUICK_RETURN = SCROLL_FLAG_SCROLL | SCROLL_FLAG_ENTER_ALWAYS; 546bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes static final int FLAG_SNAP = SCROLL_FLAG_SCROLL | SCROLL_FLAG_SNAP; 547a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 548a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int mScrollFlags = SCROLL_FLAG_SCROLL; 549a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes Interpolator mScrollInterpolator; 550a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 551a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(Context c, AttributeSet attrs) { 552a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(c, attrs); 553a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.AppBarLayout_LayoutParams); 554a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = a.getInt(R.styleable.AppBarLayout_LayoutParams_layout_scrollFlags, 0); 555a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (a.hasValue(R.styleable.AppBarLayout_LayoutParams_layout_scrollInterpolator)) { 556a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int resId = a.getResourceId( 557a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes R.styleable.AppBarLayout_LayoutParams_layout_scrollInterpolator, 0); 558a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = android.view.animation.AnimationUtils.loadInterpolator( 559a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes c, resId); 560a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 561a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 562a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 563a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 564a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height) { 565a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height); 566a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 567a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 568a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height, float weight) { 569a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height, weight); 570a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 571a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 572a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(ViewGroup.LayoutParams p) { 573a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(p); 574a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 575a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 576a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(MarginLayoutParams source) { 577a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 578a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 579a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 580a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LinearLayout.LayoutParams source) { 581a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 582a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 583a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 584a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LayoutParams source) { 585a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 586a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = source.mScrollFlags; 587a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = source.mScrollInterpolator; 588a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 589a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 590a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 591a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the scrolling flags. 592a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 593a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param flags bitwise int of {@link #SCROLL_FLAG_SCROLL}, 594bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_EXIT_UNTIL_COLLAPSED}, {@link #SCROLL_FLAG_ENTER_ALWAYS}, 595bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED} and {@link #SCROLL_FLAG_SNAP }. 596a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 597a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollFlags() 598a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 599149689d3a0b4165577470d7152112674d1d7f87cChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_LayoutParams_layout_scrollFlags 600a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 60150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public void setScrollFlags(@ScrollFlags int flags) { 602a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = flags; 603a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 604a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 605a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 606a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the scrolling flags. 607a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 608a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollFlags(int) 609a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 610149689d3a0b4165577470d7152112674d1d7f87cChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_LayoutParams_layout_scrollFlags 611a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 61250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @ScrollFlags 613a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public int getScrollFlags() { 614a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollFlags; 615a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 616a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 617a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 618a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the interpolator to when scrolling the view associated with this 619a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. 620a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 621a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param interpolator the interpolator to use, or null to use normal 1-to-1 scrolling. 622a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 623149689d3a0b4165577470d7152112674d1d7f87cChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_LayoutParams_layout_scrollInterpolator 624a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollInterpolator() 625a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 626a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setScrollInterpolator(Interpolator interpolator) { 627a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = interpolator; 628a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 629a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 630a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 631a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the {@link Interpolator} being used for scrolling the view associated with this 632a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. Null indicates 'normal' 1-to-1 scrolling. 633a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 634149689d3a0b4165577470d7152112674d1d7f87cChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_LayoutParams_layout_scrollInterpolator 635a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollInterpolator(Interpolator) 636a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 637a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Interpolator getScrollInterpolator() { 638a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollInterpolator; 639a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 640a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 641a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 642a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 643a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The default {@link Behavior} for {@link AppBarLayout}. Implements the necessary nested 644a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll handling with offsetting. 645a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 646ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class Behavior extends HeaderBehavior<AppBarLayout> { 647d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private static final int INVALID_POINTER = -1; 648e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private static final int INVALID_POSITION = -1; 649e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 650e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetDelta; 651a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 65250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes private boolean mSkipNestedPreScroll; 653bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes private boolean mWasFlung; 654631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 655631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private ValueAnimatorCompat mAnimator; 65650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 657e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetToChildIndexOnLayout = INVALID_POSITION; 658e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private boolean mOffsetToChildIndexOnLayoutIsMinHeight; 659e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private float mOffsetToChildIndexOnLayoutPerc; 660e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 661d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private boolean mIsBeingDragged; 662d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private int mActivePointerId = INVALID_POINTER; 663d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private int mLastMotionY; 664d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private int mTouchSlop = -1; 665d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 666d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private WeakReference<View> mLastNestedScrollingChildRef; 667d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 668a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior() {} 669a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 670a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior(Context context, AttributeSet attrs) { 671a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 672a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 673a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 674a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 675ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes public boolean onStartNestedScroll(CoordinatorLayout parent, AppBarLayout child, 676a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View directTargetChild, View target, int nestedScrollAxes) { 677f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // Return true if we're nested scrolling vertically, and we have scrollable children 678f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // and the scrolling view is big enough to scroll 679631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final boolean started = (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0 680f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes && child.hasScrollableChildren() 681ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes && parent.getHeight() - directTargetChild.getHeight() <= child.getHeight(); 682631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 683631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (started && mAnimator != null) { 684631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Cancel any offset animation 685631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.cancel(); 686631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 687631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 688d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // A new nested scroll has started so clear out the previous ref 689d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = null; 690d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 691631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return started; 692a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 693a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 694a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 695a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 696a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dx, int dy, int[] consumed) { 69750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy != 0 && !mSkipNestedPreScroll) { 69850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int min, max; 69950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy < 0) { 70050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling down 70150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getTotalScrollRange(); 70250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = min + child.getDownNestedPreScrollRange(); 70350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 70450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling up 70550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getUpNestedPreScrollRange(); 70650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = 0; 70750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 70850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes consumed[1] = scroll(coordinatorLayout, child, dy, min, max); 709a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 710a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 711a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 712a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 713a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 714a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dxConsumed, int dyConsumed, 715a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int dxUnconsumed, int dyUnconsumed) { 71650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dyUnconsumed < 0) { 71750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If the scrolling view is scrolling down but not consuming, it's probably be at 71850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // the top of it's content 71950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes scroll(coordinatorLayout, child, dyUnconsumed, 72050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes -child.getDownNestedScrollRange(), 0); 72150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Set the expanding flag so that onNestedPreScroll doesn't handle any events 72250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = true; 72350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 72450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // As we're no longer handling nested scrolls, reset the skip flag 72550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 726a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 72750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 728a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 72950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Override 730bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout abl, 73150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes View target) { 732bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (!mWasFlung) { 733bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we haven't been flung then let's see if the current view has been set to snap 734bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes snapToChildIfNeeded(coordinatorLayout, abl); 735bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 736bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 737bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // Reset the flags 73850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 739bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes mWasFlung = false; 740d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // Keep a reference to the previous nested scrolling child 741d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = new WeakReference<>(target); 742d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 743d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 744d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes @Override 745d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child, 746d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes MotionEvent ev) { 747d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mTouchSlop < 0) { 748d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mTouchSlop = ViewConfiguration.get(parent.getContext()).getScaledTouchSlop(); 749d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 750d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 751d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int action = ev.getAction(); 752d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 753d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // Shortcut since we're being dragged 754d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (action == MotionEvent.ACTION_MOVE && mIsBeingDragged) { 755d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return true; 756d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 757d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 758d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes switch (MotionEventCompat.getActionMasked(ev)) { 759d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_MOVE: { 760d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int activePointerId = mActivePointerId; 761d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (activePointerId == INVALID_POINTER) { 762d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // If we don't have a valid id, the touch down wasn't on content. 763d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 764d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 765d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId); 766d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (pointerIndex == -1) { 767d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 768d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 769d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 770d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int y = (int) MotionEventCompat.getY(ev, pointerIndex); 771d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int yDiff = Math.abs(y - mLastMotionY); 772d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (yDiff > mTouchSlop) { 773d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mIsBeingDragged = true; 774d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastMotionY = y; 775d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 776d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 777d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 778d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 779d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_DOWN: { 780d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mIsBeingDragged = false; 781d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int x = (int) ev.getX(); 782d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int y = (int) ev.getY(); 783d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (parent.isPointInChildBounds(child, x, y) && canDragAppBarLayout()) { 784d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastMotionY = y; 785d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mActivePointerId = MotionEventCompat.getPointerId(ev, 0); 786d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 787d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 788d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 789d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 790d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_CANCEL: 791d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_UP: 792d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mIsBeingDragged = false; 793d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mActivePointerId = INVALID_POINTER; 794d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 795d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 796d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 797d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return mIsBeingDragged; 798d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 799d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 800d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes @Override 801d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes public boolean onTouchEvent(CoordinatorLayout parent, AppBarLayout child, MotionEvent ev) { 802d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mTouchSlop < 0) { 803d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mTouchSlop = ViewConfiguration.get(parent.getContext()).getScaledTouchSlop(); 804d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 805d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 806d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes int x = (int) ev.getX(); 807d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes int y = (int) ev.getY(); 808d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 809d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes switch (MotionEventCompat.getActionMasked(ev)) { 810d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_DOWN: 811d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (parent.isPointInChildBounds(child, x, y) && canDragAppBarLayout()) { 812d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastMotionY = y; 813d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mActivePointerId = MotionEventCompat.getPointerId(ev, 0); 814d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } else { 815d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return false; 816d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 817d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 818d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_MOVE: 819d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, 820d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mActivePointerId); 821d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (activePointerIndex == -1) { 822d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return false; 823d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 824d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 825d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes y = (int) MotionEventCompat.getY(ev, activePointerIndex); 826d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 827d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes int dy = mLastMotionY - y; 828d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (!mIsBeingDragged && Math.abs(dy) > mTouchSlop) { 829d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mIsBeingDragged = true; 830d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (dy > 0) { 831d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes dy -= mTouchSlop; 832d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } else { 833d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes dy += mTouchSlop; 834d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 835d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 836d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 837d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mIsBeingDragged) { 838d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastMotionY = y; 839d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // We're being dragged so scroll the ABL 840d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes scroll(parent, child, dy, -child.getDownNestedScrollRange(), 0); 841d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 842d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 843d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_UP: 844d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_CANCEL: 845d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mIsBeingDragged = false; 846d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mActivePointerId = INVALID_POINTER; 847d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 848d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 849d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 850d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return true; 85150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 85250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 85350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Override 854631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public boolean onNestedFling(final CoordinatorLayout coordinatorLayout, 855631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final AppBarLayout child, View target, float velocityX, float velocityY, 856631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes boolean consumed) { 857bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes boolean flung = false; 858bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 859631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (!consumed) { 860631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // It has been consumed so let's fling ourselves 861bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = fling(coordinatorLayout, child, -child.getTotalScrollRange(), 862bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 0, -velocityY); 863631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 864631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we're scrolling up and the child also consumed the fling. We'll fake scroll 865631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // upto our 'collapsed' offset 866631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (velocityY < 0) { 867631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling down 868bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int targetScroll = -child.getTotalScrollRange() 869631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes + child.getDownNestedPreScrollRange(); 870bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (getTopBottomOffsetForScrollingSibling() < targetScroll) { 871bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we're currently not expanded more than the target scroll, we'll 872bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // animate a fling 873bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll); 874bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = true; 875631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 876631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 877631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling up 878bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int targetScroll = -child.getUpNestedPreScrollRange(); 879bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (getTopBottomOffsetForScrollingSibling() > targetScroll) { 880bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we're currently not expanded less than the target scroll, we'll 881bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // animate a fling 882bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll); 883bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = true; 884631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 885631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 886631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 887631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 888bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes mWasFlung = flung; 889bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes return flung; 890631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 891631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 892631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private void animateOffsetTo(final CoordinatorLayout coordinatorLayout, 893631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final AppBarLayout child, int offset) { 894631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (mAnimator == null) { 895631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator = ViewUtils.createAnimator(); 896631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.setInterpolator(AnimationUtils.DECELERATE_INTERPOLATOR); 897631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.setUpdateListener(new ValueAnimatorCompat.AnimatorUpdateListener() { 898631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 899631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void onAnimationUpdate(ValueAnimatorCompat animator) { 900ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(coordinatorLayout, child, 901631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes animator.getAnimatedIntValue()); 902631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 903631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes }); 904631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 905631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.cancel(); 906631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 907631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 908631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.setIntValues(getTopBottomOffsetForScrollingSibling(), offset); 909631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.start(); 910631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 911631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 912631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 913bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes private View getChildOnOffset(AppBarLayout abl, final int offset) { 914bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes for (int i = 0, count = abl.getChildCount(); i < count; i++) { 915bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes View child = abl.getChildAt(i); 916bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (child.getTop() <= -offset && child.getBottom() >= -offset) { 917bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes return child; 918bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 919bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 920bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes return null; 921bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 922bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 923bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes private void snapToChildIfNeeded(CoordinatorLayout coordinatorLayout, AppBarLayout abl) { 924bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int offset = getTopBottomOffsetForScrollingSibling(); 925bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final View offsetChild = getChildOnOffset(abl, offset); 926bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (offsetChild != null) { 927bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final LayoutParams lp = (LayoutParams) offsetChild.getLayoutParams(); 928bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if ((lp.getScrollFlags() & LayoutParams.FLAG_SNAP) == LayoutParams.FLAG_SNAP) { 929bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // We're set the snap, so animate the offset to the nearest edge 930bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int childTop = -offsetChild.getTop(); 931bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int childBottom = -offsetChild.getBottom(); 932bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes animateOffsetTo(coordinatorLayout, abl, 933bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes offset < (childBottom + childTop) / 2 ? childBottom : childTop); 934bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 935bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 936bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 937bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 938631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 9399995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public boolean onLayoutChild(CoordinatorLayout parent, AppBarLayout abl, 94050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int layoutDirection) { 9419995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes boolean handled = super.onLayoutChild(parent, abl, layoutDirection); 9429995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 9439995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int pendingAction = abl.getPendingAction(); 9449995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (pendingAction != PENDING_ACTION_NONE) { 9459995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final boolean animate = (pendingAction & PENDING_ACTION_ANIMATE_ENABLED) != 0; 9469995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if ((pendingAction & PENDING_ACTION_COLLAPSED) != 0) { 9479995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int offset = -abl.getUpNestedPreScrollRange(); 9489995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 9499995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes animateOffsetTo(parent, abl, offset); 9509995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 951ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, offset); 9529995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 9539995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if ((pendingAction & PENDING_ACTION_EXPANDED) != 0) { 9549995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 9559995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes animateOffsetTo(parent, abl, 0); 9569995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 957ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, 0); 9589995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 9599995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 9609995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if (mOffsetToChildIndexOnLayout >= 0) { 9619995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes View child = abl.getChildAt(mOffsetToChildIndexOnLayout); 962e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int offset = -child.getBottom(); 963e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (mOffsetToChildIndexOnLayoutIsMinHeight) { 964e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes offset += ViewCompat.getMinimumHeight(child); 965e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 966e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes offset += Math.round(child.getHeight() * mOffsetToChildIndexOnLayoutPerc); 967e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 968e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes setTopAndBottomOffset(offset); 969e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 97050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 97179aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes // Finally reset any pending states 97279aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes abl.resetPendingAction(); 97379aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 97479aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes 97550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Make sure we update the elevation 9769995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes dispatchOffsetUpdates(abl); 97750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 97850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return handled; 979a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 980a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 981d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private boolean canDragAppBarLayout() { 982d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mLastNestedScrollingChildRef != null) { 983d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final View view = mLastNestedScrollingChildRef.get(); 984d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return view != null && view.isShown() && !ViewCompat.canScrollVertically(view, -1); 985d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 986d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return false; 987d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 988d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 989ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 990ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor protected int setHeaderTopBottomOffset(CoordinatorLayout coordinatorLayout, 991ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor View header, int newOffset, int minOffset, int maxOffset) { 992e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int curOffset = getTopBottomOffsetForScrollingSibling(); 993a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int consumed = 0; 994a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 995ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor if ((header instanceof AppBarLayout) && minOffset != 0 && curOffset >= minOffset 996ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor && curOffset <= maxOffset) { 997631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we have some scrolling range, and we're currently within the min and max 998631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // offsets, calculate a new offset 99950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes newOffset = MathUtils.constrain(newOffset, minOffset, maxOffset); 1000ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor AppBarLayout appBarLayout = (AppBarLayout) header; 1001a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (curOffset != newOffset) { 1002e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int interpolatedOffset = appBarLayout.hasChildWithInterpolator() 1003e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ? interpolateOffset(appBarLayout, newOffset) 1004e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes : newOffset; 1005e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1006e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes boolean offsetChanged = setTopAndBottomOffset(interpolatedOffset); 1007631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 1008a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update how much dy we have consumed 1009a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes consumed = curOffset - newOffset; 1010a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update the stored sibling offset 1011e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetDelta = newOffset - interpolatedOffset; 1012a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1013a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (!offsetChanged && appBarLayout.hasChildWithInterpolator()) { 1014a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If the offset hasn't changed and we're using an interpolated scroll 1015a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // then we need to keep any dependent views updated. CoL will do this for 1016a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us when we move, but we need to do it manually when we don't (as an 1017a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // interpolated scroll may finish early). 1018a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes coordinatorLayout.dispatchDependentViewsChanged(appBarLayout); 1019a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1020a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1021631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Dispatch the updates to any listeners 1022631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes dispatchOffsetUpdates(appBarLayout); 1023a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1024a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1025a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1026a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return consumed; 1027a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1028a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1029631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private void dispatchOffsetUpdates(AppBarLayout layout) { 10306f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes final List<OnOffsetChangedListener> listeners = layout.mListeners; 103150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1032631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Iterate backwards through the list so that most recently added listeners 1033631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // get the first chance to decide 1034631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes for (int i = 0, z = listeners.size(); i < z; i++) { 10356f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes final OnOffsetChangedListener listener = listeners.get(i); 1036631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (listener != null) { 1037631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes listener.onOffsetChanged(layout, getTopAndBottomOffset()); 1038a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1039a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1040a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1041a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1042a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int interpolateOffset(AppBarLayout layout, final int offset) { 1043a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int absOffset = Math.abs(offset); 1044a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1045a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 1046a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = layout.getChildAt(i); 1047a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 104850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 1049a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 105050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 1051a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 105250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int childScrollableHeight = 0; 105350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int flags = childLp.getScrollFlags(); 105450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 1055b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // We're set to scroll so add the child's height plus margin 1056b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childScrollableHeight += child.getHeight() + childLp.topMargin 1057b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes + childLp.bottomMargin; 1058b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes 105950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 1060b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // For a collapsing scroll, we to take the collapsed height 1061b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // into account. 106250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes childScrollableHeight -= ViewCompat.getMinimumHeight(child); 106350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 106450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 106550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1066ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (ViewCompat.getFitsSystemWindows(child)) { 1067ea004a01f44aaf36212120c936952c1742d03d30Chris Banes childScrollableHeight -= layout.getTopInset(); 1068ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1069ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 107050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (childScrollableHeight > 0) { 107150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int offsetForView = absOffset - child.getTop(); 107250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int interpolatedDiff = Math.round(childScrollableHeight * 107350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes interpolator.getInterpolation( 107450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes offsetForView / (float) childScrollableHeight)); 107550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 107650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return Integer.signum(offset) * (child.getTop() + interpolatedDiff); 107750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 1078a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 107950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 108050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If we get to here then the view on the offset isn't suitable for interpolated 108150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // scrolling. So break out of the loop 108250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes break; 1083a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1084a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1085a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1086a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return offset; 1087a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1088a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1089ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 1090ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor protected int getTopBottomOffsetForScrollingSibling() { 1091e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return getTopAndBottomOffset() + mOffsetDelta; 1092e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1093e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1094e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1095e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public Parcelable onSaveInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout) { 1096e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final Parcelable superState = super.onSaveInstanceState(parent, appBarLayout); 1097e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int offset = getTopAndBottomOffset(); 1098e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1099e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Try and find the first visible child... 1100e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes for (int i = 0, count = appBarLayout.getChildCount(); i < count; i++) { 1101e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes View child = appBarLayout.getChildAt(i); 1102e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int visBottom = child.getBottom() + offset; 1103e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1104e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (child.getTop() + offset <= 0 && visBottom >= 0) { 1105e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = new SavedState(superState); 1106e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibleChildIndex = i; 1107e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibileChildAtMinimumHeight = 1108e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes visBottom == ViewCompat.getMinimumHeight(child); 1109e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibileChildPercentageShown = visBottom / (float) child.getHeight(); 1110e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return ss; 1111e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1112e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1113e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1114e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Else we'll just return the super state 1115e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return superState; 1116e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1117e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1118e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1119e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void onRestoreInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout, 1120e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes Parcelable state) { 1121e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (state instanceof SavedState) { 1122e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = (SavedState) state; 1123e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, ss.getSuperState()); 1124e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = ss.firstVisibleChildIndex; 1125e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayoutPerc = ss.firstVisibileChildPercentageShown; 1126e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayoutIsMinHeight = ss.firstVisibileChildAtMinimumHeight; 1127e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 1128e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, state); 1129e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 1130e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1131e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1132e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1133e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes protected static class SavedState extends View.BaseSavedState { 1134e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int firstVisibleChildIndex; 1135e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes float firstVisibileChildPercentageShown; 1136e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes boolean firstVisibileChildAtMinimumHeight; 1137e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1138e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState(Parcel source) { 1139e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super(source); 1140e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibleChildIndex = source.readInt(); 1141e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibileChildPercentageShown = source.readFloat(); 1142e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibileChildAtMinimumHeight = source.readByte() != 0; 1143e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1144e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1145e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState(Parcelable superState) { 1146e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super(superState); 1147e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1148e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1149e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1150e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void writeToParcel(Parcel dest, int flags) { 1151e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.writeToParcel(dest, flags); 1152e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeInt(firstVisibleChildIndex); 1153e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeFloat(firstVisibileChildPercentageShown); 1154e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeByte((byte) (firstVisibileChildAtMinimumHeight ? 1 : 0)); 1155e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1156e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1157e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public static final Parcelable.Creator<SavedState> CREATOR = 1158e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes new Parcelable.Creator<SavedState>() { 1159e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1160e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState createFromParcel(Parcel source) { 1161e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return new SavedState(source); 1162e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1163e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1164e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1165e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState[] newArray(int size) { 1166e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return new SavedState[size]; 1167e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1168e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes }; 1169a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1170a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1171a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1172a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1173a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Behavior which should be used by {@link View}s which can scroll vertically and support 1174a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * nested scrolling to automatically scroll any {@link AppBarLayout} siblings. 1175a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1176ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class ScrollingViewBehavior extends HeaderScrollingViewBehavior { 1177a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mOverlayTop; 1178a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1179a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior() {} 1180a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1181a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior(Context context, AttributeSet attrs) { 1182a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 1183a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1184a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes TypedArray a = context.obtainStyledAttributes(attrs, 1185a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes R.styleable.ScrollingViewBehavior_Params); 1186a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mOverlayTop = a.getDimensionPixelSize( 1187a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes R.styleable.ScrollingViewBehavior_Params_behavior_overlapTop, 0); 1188a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 1189a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1190a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1191a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1192a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) { 1193a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We depend on any AppBarLayouts 1194a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return dependency instanceof AppBarLayout; 1195a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1196a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1197a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 11980d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes public boolean onLayoutChild(CoordinatorLayout parent, View child, int layoutDirection) { 11990d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes // First lay out the child as normal 12000d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes super.onLayoutChild(parent, child, layoutDirection); 12010d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 12020d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes // Now offset us correctly to be in the correct position. This is important for things 12030d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes // like activity transitions which rely on accurate positioning after the first layout. 12040d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes final List<View> dependencies = parent.getDependencies(child); 12050d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes for (int i = 0, z = dependencies.size(); i < z; i++) { 12060d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes if (updateOffset(parent, child, dependencies.get(i))) { 12070d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes // If we updated the offset, break out of the loop now 12080d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes break; 12090d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 12100d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 12110d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return true; 12120d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 12130d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 12140d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes @Override 1215a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean onDependentViewChanged(CoordinatorLayout parent, View child, 1216a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View dependency) { 12170d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes updateOffset(parent, child, dependency); 12180d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return false; 12190d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 12200d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 12210d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes private boolean updateOffset(CoordinatorLayout parent, View child, View dependency) { 1222a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final CoordinatorLayout.Behavior behavior = 1223a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes ((CoordinatorLayout.LayoutParams) dependency.getLayoutParams()).getBehavior(); 1224a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (behavior instanceof Behavior) { 1225a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Offset the child so that it is below the app-bar (with any overlap) 1226ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int offset = ((Behavior) behavior).getTopBottomOffsetForScrollingSibling(); 1227ea004a01f44aaf36212120c936952c1742d03d30Chris Banes setTopAndBottomOffset(dependency.getHeight() + offset 1228ea004a01f44aaf36212120c936952c1742d03d30Chris Banes - getOverlapForOffset(dependency, offset)); 12290d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return true; 1230ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1231ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return false; 1232ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1233ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 1234ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getOverlapForOffset(final View dependency, final int offset) { 1235ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (mOverlayTop != 0 && dependency instanceof AppBarLayout) { 1236ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final AppBarLayout abl = (AppBarLayout) dependency; 1237ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int totalScrollRange = abl.getTotalScrollRange(); 1238ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int preScrollDown = abl.getDownNestedPreScrollRange(); 1239a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1240ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (preScrollDown != 0 && (totalScrollRange + offset) <= preScrollDown) { 1241ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // If we're in a pre-scroll down. Don't use the offset at all. 1242ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return 0; 1243a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 1244ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int availScrollRange = totalScrollRange - preScrollDown; 1245ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (availScrollRange == 0) { 1246ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Else we'll use a interpolated ratio of the overlap, depending on offset 1247ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final float percScrolled = offset / (float) availScrollRange; 1248ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return MathUtils.constrain( 1249ea004a01f44aaf36212120c936952c1742d03d30Chris Banes Math.round((1f + percScrolled) * mOverlayTop), 0, mOverlayTop); 1250ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1251a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1252a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1253ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mOverlayTop; 1254a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1255a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1256a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1257a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the distance that this view should overlap any {@link AppBarLayout}. 1258a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 1259a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param overlayTop the distance in px 1260a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1261a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setOverlayTop(int overlayTop) { 1262a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mOverlayTop = overlayTop; 1263a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1264a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1265a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1266a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the distance that this view should overlap any {@link AppBarLayout}. 1267a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1268a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public int getOverlayTop() { 1269a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mOverlayTop; 1270a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1271a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1272ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 1273ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor protected View findFirstDependency(List<View> views) { 1274a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = views.size(); i < z; i++) { 1275a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View view = views.get(i); 1276a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (view instanceof AppBarLayout) { 1277a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return (AppBarLayout) view; 1278a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1279a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1280a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return null; 1281a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1282ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor 1283ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 1284ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor protected int getScrollRange(View v) { 1285ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor if (v instanceof AppBarLayout) { 1286ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return ((AppBarLayout) v).getTotalScrollRange(); 1287ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } else { 1288ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return super.getScrollRange(v); 1289ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1290ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1291a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1292a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes} 1293