AppBarLayout.java revision 79aa418487cdefb85d3c1fac32d6403a1ac6057d
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; 28631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banesimport android.support.v4.widget.ScrollerCompat; 29a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.util.AttributeSet; 30d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport android.view.MotionEvent; 31a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.View; 32d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport android.view.ViewConfiguration; 33a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.ViewGroup; 34a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.animation.Interpolator; 35a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.widget.LinearLayout; 36a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 3750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.Retention; 3850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.RetentionPolicy; 39d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport java.lang.ref.WeakReference; 40631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banesimport java.util.ArrayList; 41a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport java.util.List; 42a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 43a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes/** 44a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * AppBarLayout is a vertical {@link LinearLayout} which implements many of the features of 459fb154338a62edc2c57dc036895199d6f1769400Chris Banes * material designs app bar concept, namely scrolling gestures. 46a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 47a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Children should provide their desired scrolling behavior through 48a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams#setScrollFlags(int)} and the associated layout xml attribute: 49a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@code app:layout_scrollFlags}. 50a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 51a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 52a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * This view depends heavily on being used as a direct child within a {@link CoordinatorLayout}. 53a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * If you use AppBarLayout within a different {@link ViewGroup}, most of it's functionality will 54a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * not work. 55a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 569fb154338a62edc2c57dc036895199d6f1769400Chris Banes * AppBarLayout also requires a separate scrolling sibling in order to know when to scroll. 579fb154338a62edc2c57dc036895199d6f1769400Chris Banes * The binding is done through the {@link ScrollingViewBehavior} behavior class, meaning that you 589fb154338a62edc2c57dc036895199d6f1769400Chris Banes * should set your scrolling view's behavior to be an instance of {@link ScrollingViewBehavior}. 599fb154338a62edc2c57dc036895199d6f1769400Chris Banes * A string resource containing the full class name is available. 60a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 61a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <pre> 62a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.CoordinatorLayout 63a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:android="http://schemas.android.com/apk/res/android" 64a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:app="http://schemas.android.com/apk/res-auto" 65a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 66a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent"> 67a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 68a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v4.widget.NestedScrollView 69a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 70a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent" 71a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_behavior="@string/appbar_scrolling_view_behavior"> 72a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 73a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <!-- Your scrolling content --> 74a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 75a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.v4.widget.NestedScrollView> 76a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 77a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.AppBarLayout 78a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="wrap_content" 79a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent"> 80a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 81a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v7.widget.Toolbar 82a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 83a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 84a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 85a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.TabLayout 86a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 87a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 88a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 89a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.AppBarLayout> 90a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 91a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.CoordinatorLayout> 92a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </pre> 93a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 94a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see <a href="http://www.google.com/design/spec/layout/structure.html#structure-app-bar"> 95a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * http://www.google.com/design/spec/layout/structure.html#structure-app-bar</a> 96a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 97a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes@CoordinatorLayout.DefaultBehavior(AppBarLayout.Behavior.class) 98a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banespublic class AppBarLayout extends LinearLayout { 99a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1009995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_NONE = 0x0; 1019995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_EXPANDED = 0x1; 1029995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_COLLAPSED = 0x2; 1039995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_ANIMATE_ENABLED = 0x4; 1049995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 105a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 106631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Interface definition for a callback to be invoked when an {@link AppBarLayout}'s vertical 107631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * offset changes. 108a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 109631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public interface OnOffsetChangedListener { 110a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 111a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Called when the {@link AppBarLayout}'s layout offset has been changed. This allows 112a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * child views to implement custom behavior based on the offset (for instance pinning a 113a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * view at a certain y value). 114a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 115631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param appBarLayout the {@link AppBarLayout} which offset has changed 11650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes * @param verticalOffset the vertical offset for the parent {@link AppBarLayout}, in px 117a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 118631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset); 119a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 120a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 121a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private static final int INVALID_SCROLL_RANGE = -1; 122a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 123a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mTotalScrollRange = INVALID_SCROLL_RANGE; 124a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownPreScrollRange = INVALID_SCROLL_RANGE; 125a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownScrollRange = INVALID_SCROLL_RANGE; 126a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 127a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes boolean mHaveChildWithInterpolator; 128a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 12950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes private float mTargetElevation; 13050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1319995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private int mPendingAction = PENDING_ACTION_NONE; 1329995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 1336ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes private WindowInsetsCompat mLastInsets; 1346ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 1356f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes private final List<OnOffsetChangedListener> mListeners; 136631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 137a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context) { 138a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes this(context, null); 139a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 140a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 141a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context, AttributeSet attrs) { 142a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 143a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes setOrientation(VERTICAL); 14450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 145809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes ThemeUtils.checkAppCompatTheme(context); 146809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes 14750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AppBarLayout, 14850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 0, R.style.Widget_Design_AppBarLayout); 14950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mTargetElevation = a.getDimensionPixelSize(R.styleable.AppBarLayout_elevation, 0); 15081520564f3dd783136e025174021ba4eabd6ff3cChris Banes setBackgroundDrawable(a.getDrawable(R.styleable.AppBarLayout_android_background)); 1519995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (a.hasValue(R.styleable.AppBarLayout_expanded)) { 1529995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(a.getBoolean(R.styleable.AppBarLayout_expanded, false)); 1539995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 15450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes a.recycle(); 15550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 15650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Use the bounds view outline provider so that we cast a shadow, even without a background 15750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes ViewUtils.setBoundsViewOutlineProvider(this); 158631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 159631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mListeners = new ArrayList<>(); 160631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 161631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes ViewCompat.setElevation(this, mTargetElevation); 1626ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 1636ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes ViewCompat.setOnApplyWindowInsetsListener(this, 1646ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes new android.support.v4.view.OnApplyWindowInsetsListener() { 1656ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes @Override 1666ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public WindowInsetsCompat onApplyWindowInsets(View v, 1676ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes WindowInsetsCompat insets) { 1686ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes setWindowInsets(insets); 1696ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes return insets.consumeSystemWindowInsets(); 1706ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 1716ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes }); 172631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 173631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 174631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 175631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Add a listener that will be called when the offset of this {@link AppBarLayout} changes. 176631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 177631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener The listener that will be called when the offset changes.] 178631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 179631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @see #removeOnOffsetChangedListener(OnOffsetChangedListener) 180631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 181631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void addOnOffsetChangedListener(OnOffsetChangedListener listener) { 1826f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes if (listener != null && !mListeners.contains(listener)) { 1836f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.add(listener); 184631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 185631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 186631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 187631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 188631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Remove the previously added {@link OnOffsetChangedListener}. 189631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 190631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener the listener to remove. 191631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 192631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void removeOnOffsetChangedListener(OnOffsetChangedListener listener) { 1936f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes if (listener != null) { 1946f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.remove(listener); 195631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 196a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 197a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 198a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 199ea004a01f44aaf36212120c936952c1742d03d30Chris Banes protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 200ea004a01f44aaf36212120c936952c1742d03d30Chris Banes super.onMeasure(widthMeasureSpec, heightMeasureSpec); 201ea004a01f44aaf36212120c936952c1742d03d30Chris Banes invalidateScrollRanges(); 202ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 203ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 204ea004a01f44aaf36212120c936952c1742d03d30Chris Banes @Override 205a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected void onLayout(boolean changed, int l, int t, int r, int b) { 206a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.onLayout(changed, l, t, r, b); 20779aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes invalidateScrollRanges(); 208a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 209a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = false; 210a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 211a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 212a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 213a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 214a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 215a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 216a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = true; 217a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 218a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 219a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 220a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 221a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 222ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void invalidateScrollRanges() { 223ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Invalidate the scroll ranges 224ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mTotalScrollRange = INVALID_SCROLL_RANGE; 225ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownPreScrollRange = INVALID_SCROLL_RANGE; 226ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownScrollRange = INVALID_SCROLL_RANGE; 227ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 228ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 229a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 230a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setOrientation(int orientation) { 231a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (orientation != VERTICAL) { 232a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes throw new IllegalArgumentException("AppBarLayout is always vertical and does" 233a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes + " not support horizontal orientation"); 234a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 235a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.setOrientation(orientation); 236a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 237a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 2389995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2399995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not, animating if it has already 2409995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * been laid out. 2419995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2429995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2439995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2449995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2459995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2469995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2479995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2489995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2499995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2509995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded) { 2519995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(expanded, ViewCompat.isLaidOut(this)); 2529995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 2539995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 2549995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2559995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not. 2569995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2579995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2589995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2599995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2609995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2619995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2629995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param animate Whether to animate to the new state 2639995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2649995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2659995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2669995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded, boolean animate) { 2679995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = (expanded ? PENDING_ACTION_EXPANDED : PENDING_ACTION_COLLAPSED) 2689995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes | (animate ? PENDING_ACTION_ANIMATE_ENABLED : 0); 2699995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes requestLayout(); 2709995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 2719995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 272a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 273a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 274a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return p instanceof LayoutParams; 275a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 276a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 277a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 278a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateDefaultLayoutParams() { 279a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 280a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 281a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 282a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 283a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams generateLayoutParams(AttributeSet attrs) { 284a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(getContext(), attrs); 285a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 286a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 287a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 288a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 289a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (p instanceof LinearLayout.LayoutParams) { 290a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((LinearLayout.LayoutParams) p); 291a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (p instanceof MarginLayoutParams) { 292a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((MarginLayoutParams) p); 293a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 294a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(p); 295a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 296a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 297ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private boolean hasChildWithInterpolator() { 298a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mHaveChildWithInterpolator; 299a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 300a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 301a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 3026ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes * Returns the scroll range of all children. 303a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 304a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @return the scroll range in px 305a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 3066ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public final int getTotalScrollRange() { 307a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mTotalScrollRange != INVALID_SCROLL_RANGE) { 308a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mTotalScrollRange; 309a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 310a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 311a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 312a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 313a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 314a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 315ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 316a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 317a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 318a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 319a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 320b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += childHeight + lp.topMargin + lp.bottomMargin; 321a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 322a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 323a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing scroll, we to take the collapsed height into account. 3246ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // We also break straight away since later views can't scroll beneath 325a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us 3266ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes range -= ViewCompat.getMinimumHeight(child); 3276ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes break; 328a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 329a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 330a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 331a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 332a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 333a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 334a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 335ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mTotalScrollRange = (range - getTopInset()); 336a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 337a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 338ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private boolean hasScrollableChildren() { 339a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return getTotalScrollRange() != 0; 340a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 341a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 342a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 343a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling up from a nested pre-scroll. 344a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 345ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getUpNestedPreScrollRange() { 34650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return getTotalScrollRange(); 347a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 348a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 349a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 350a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested pre-scroll. 351a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 352ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getDownNestedPreScrollRange() { 353a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownPreScrollRange != INVALID_SCROLL_RANGE) { 354a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 355a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownPreScrollRange; 356a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 357a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 358a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 359a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = getChildCount() - 1; i >= 0; i--) { 360a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 361a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 362ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 363a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 364a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 365a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.FLAG_QUICK_RETURN) == LayoutParams.FLAG_QUICK_RETURN) { 366b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // First take the margin into account 367b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += lp.topMargin + lp.bottomMargin; 368a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // The view has the quick return flag combination... 369a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED) != 0) { 370a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If they're set to enter collapsed, use the minimum height 371a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += ViewCompat.getMinimumHeight(child); 372a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 373a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Else use the full height 374a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 375a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 376a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (range > 0) { 377a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we've hit an non-quick return scrollable view, and we've already hit a 378a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // quick return view, return now 379a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 380a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 381a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 382a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownPreScrollRange = range; 383a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 384a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 385a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 386a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested scroll. 387a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 388ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getDownNestedScrollRange() { 389a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownScrollRange != INVALID_SCROLL_RANGE) { 390a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 391a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownScrollRange; 392a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 393a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 394a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 395c1ce4f6cf4d99d6856c4259bf1bb1cb56f604737Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 396a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 397a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 398ea004a01f44aaf36212120c936952c1742d03d30Chris Banes int childHeight = child.getMeasuredHeight(); 399b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childHeight += lp.topMargin + lp.bottomMargin; 400a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 401a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 402a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 403a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 404a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 405a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 406a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 407a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 408a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing exit scroll, we to take the collapsed height into account. 409a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We also return the range straight away since later views can't scroll 410a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // beneath us 411ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mDownScrollRange = (range - ViewCompat.getMinimumHeight(child)); 412a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 413a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 414a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 415a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 416a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 417a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 418a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 419a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownScrollRange = range; 420a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 421a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 42250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int getMinimumHeightForVisibleOverlappingContent() { 4236ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes final int topInset = mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0; 42450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int minHeight = ViewCompat.getMinimumHeight(this); 42550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (minHeight != 0) { 42650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If this layout has a min height, use it (doubled) 4276ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes return (minHeight * 2) + topInset; 42850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 42950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 43050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Otherwise, we'll use twice the min height of our last child 43150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int childCount = getChildCount(); 43250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return childCount >= 1 4336ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes ? (ViewCompat.getMinimumHeight(getChildAt(childCount - 1)) * 2) + topInset 43450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes : 0; 43550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 43650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 43750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** 438631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Set the elevation value to use when this {@link AppBarLayout} should be elevated 439631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * above content. 440631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * <p> 441631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * This method does not do anything itself. A typical use for this method is called from within 442631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * an {@link OnOffsetChangedListener} when the offset has changed in such a way to require an 443631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * elevation change. 444631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 445631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param elevation the elevation value to use. 446631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 447631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @see ViewCompat#setElevation(View, float) 44850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes */ 449631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void setTargetElevation(float elevation) { 450631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mTargetElevation = elevation; 451631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 452631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 453631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 454631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Returns the elevation value to use when this {@link AppBarLayout} should be elevated 455631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * above content. 456631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 457631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public float getTargetElevation() { 45850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return mTargetElevation; 45950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 46050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 461ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getPendingAction() { 4629995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes return mPendingAction; 4639995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 4649995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 465ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void resetPendingAction() { 4669995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = PENDING_ACTION_NONE; 4679995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 4689995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 469ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getTopInset() { 470ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0; 471ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 472ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 4736ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes private void setWindowInsets(WindowInsetsCompat insets) { 4746ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // Invalidate the total scroll range... 4756ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes mTotalScrollRange = INVALID_SCROLL_RANGE; 4766ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes mLastInsets = insets; 4776ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 4786ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // Now dispatch them to our children 4796ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 4806ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes final View child = getChildAt(i); 4816ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes insets = ViewCompat.dispatchApplyWindowInsets(child, insets); 4826ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes if (insets.isConsumed()) { 4836ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes break; 4846ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 4856ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 4866ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 4876ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 488a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static class LayoutParams extends LinearLayout.LayoutParams { 48950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 49050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** @hide */ 49150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @IntDef(flag=true, value={ 49250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_SCROLL, 49350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_EXIT_UNTIL_COLLAPSED, 49450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_ENTER_ALWAYS, 49550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED 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 /** 535a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Internal flag which allows quick checking of 'quick return' 536a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 537a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes static final int FLAG_QUICK_RETURN = SCROLL_FLAG_SCROLL | SCROLL_FLAG_ENTER_ALWAYS; 538a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 539a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int mScrollFlags = SCROLL_FLAG_SCROLL; 540a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes Interpolator mScrollInterpolator; 541a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 542a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(Context c, AttributeSet attrs) { 543a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(c, attrs); 544a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.AppBarLayout_LayoutParams); 545a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = a.getInt(R.styleable.AppBarLayout_LayoutParams_layout_scrollFlags, 0); 546a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (a.hasValue(R.styleable.AppBarLayout_LayoutParams_layout_scrollInterpolator)) { 547a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int resId = a.getResourceId( 548a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes R.styleable.AppBarLayout_LayoutParams_layout_scrollInterpolator, 0); 549a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = android.view.animation.AnimationUtils.loadInterpolator( 550a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes c, resId); 551a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 552a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 553a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 554a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 555a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height) { 556a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height); 557a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 558a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 559a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height, float weight) { 560a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height, weight); 561a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 562a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 563a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(ViewGroup.LayoutParams p) { 564a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(p); 565a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 566a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 567a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(MarginLayoutParams source) { 568a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 569a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 570a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 571a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LinearLayout.LayoutParams source) { 572a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 573a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 574a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 575a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LayoutParams source) { 576a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 577a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = source.mScrollFlags; 578a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = source.mScrollInterpolator; 579a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 580a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 581a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 582a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the scrolling flags. 583a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 584a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param flags bitwise int of {@link #SCROLL_FLAG_SCROLL}, 585a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link #SCROLL_FLAG_EXIT_UNTIL_COLLAPSED}, {@link #SCROLL_FLAG_ENTER_ALWAYS} 586a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * and {@link #SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED}. 587a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 588a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollFlags() 589a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 590149689d3a0b4165577470d7152112674d1d7f87cChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_LayoutParams_layout_scrollFlags 591a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 59250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public void setScrollFlags(@ScrollFlags int flags) { 593a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = flags; 594a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 595a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 596a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 597a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the scrolling flags. 598a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 599a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollFlags(int) 600a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 601149689d3a0b4165577470d7152112674d1d7f87cChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_LayoutParams_layout_scrollFlags 602a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 60350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @ScrollFlags 604a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public int getScrollFlags() { 605a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollFlags; 606a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 607a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 608a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 609a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the interpolator to when scrolling the view associated with this 610a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. 611a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 612a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param interpolator the interpolator to use, or null to use normal 1-to-1 scrolling. 613a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 614149689d3a0b4165577470d7152112674d1d7f87cChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_LayoutParams_layout_scrollInterpolator 615a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollInterpolator() 616a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 617a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setScrollInterpolator(Interpolator interpolator) { 618a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = interpolator; 619a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 620a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 621a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 622a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the {@link Interpolator} being used for scrolling the view associated with this 623a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. Null indicates 'normal' 1-to-1 scrolling. 624a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 625149689d3a0b4165577470d7152112674d1d7f87cChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_LayoutParams_layout_scrollInterpolator 626a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollInterpolator(Interpolator) 627a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 628a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Interpolator getScrollInterpolator() { 629a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollInterpolator; 630a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 631a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 632a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 633a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 634a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The default {@link Behavior} for {@link AppBarLayout}. Implements the necessary nested 635a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll handling with offsetting. 636a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 637a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static class Behavior extends ViewOffsetBehavior<AppBarLayout> { 638d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private static final int INVALID_POINTER = -1; 639e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private static final int INVALID_POSITION = -1; 640e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 641e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetDelta; 642a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 64350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes private boolean mSkipNestedPreScroll; 644631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private Runnable mFlingRunnable; 645631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private ScrollerCompat mScroller; 646631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 647631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private ValueAnimatorCompat mAnimator; 64850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 649e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetToChildIndexOnLayout = INVALID_POSITION; 650e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private boolean mOffsetToChildIndexOnLayoutIsMinHeight; 651e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private float mOffsetToChildIndexOnLayoutPerc; 652e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 653d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private boolean mIsBeingDragged; 654d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private int mActivePointerId = INVALID_POINTER; 655d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private int mLastMotionY; 656d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private int mTouchSlop = -1; 657d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 658d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private WeakReference<View> mLastNestedScrollingChildRef; 659d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 660a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior() {} 661a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 662a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior(Context context, AttributeSet attrs) { 663a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 664a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 665a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 666a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 667ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes public boolean onStartNestedScroll(CoordinatorLayout parent, AppBarLayout child, 668a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View directTargetChild, View target, int nestedScrollAxes) { 669f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // Return true if we're nested scrolling vertically, and we have scrollable children 670f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // and the scrolling view is big enough to scroll 671631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final boolean started = (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0 672f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes && child.hasScrollableChildren() 673ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes && parent.getHeight() - directTargetChild.getHeight() <= child.getHeight(); 674631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 675631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (started && mAnimator != null) { 676631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Cancel any offset animation 677631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.cancel(); 678631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 679631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 680d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // A new nested scroll has started so clear out the previous ref 681d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = null; 682d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 683631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return started; 684a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 685a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 686a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 687a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 688a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dx, int dy, int[] consumed) { 68950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy != 0 && !mSkipNestedPreScroll) { 69050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int min, max; 69150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy < 0) { 69250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling down 69350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getTotalScrollRange(); 69450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = min + child.getDownNestedPreScrollRange(); 69550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 69650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling up 69750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getUpNestedPreScrollRange(); 69850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = 0; 69950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 70050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes consumed[1] = scroll(coordinatorLayout, child, dy, min, max); 701a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 702a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 703a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 704a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 705a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 706a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dxConsumed, int dyConsumed, 707a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int dxUnconsumed, int dyUnconsumed) { 70850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dyUnconsumed < 0) { 70950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If the scrolling view is scrolling down but not consuming, it's probably be at 71050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // the top of it's content 71150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes scroll(coordinatorLayout, child, dyUnconsumed, 71250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes -child.getDownNestedScrollRange(), 0); 71350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Set the expanding flag so that onNestedPreScroll doesn't handle any events 71450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = true; 71550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 71650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // As we're no longer handling nested scrolls, reset the skip flag 71750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 718a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 71950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 720a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 72150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Override 72250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 72350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes View target) { 72450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Reset the skip flag 72550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 726d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // Keep a reference to the previous nested scrolling child 727d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = new WeakReference<>(target); 728d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 729d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 730d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes @Override 731d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child, 732d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes MotionEvent ev) { 733d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mTouchSlop < 0) { 734d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mTouchSlop = ViewConfiguration.get(parent.getContext()).getScaledTouchSlop(); 735d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 736d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 737d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int action = ev.getAction(); 738d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 739d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // Shortcut since we're being dragged 740d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (action == MotionEvent.ACTION_MOVE && mIsBeingDragged) { 741d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return true; 742d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 743d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 744d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes switch (MotionEventCompat.getActionMasked(ev)) { 745d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_MOVE: { 746d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int activePointerId = mActivePointerId; 747d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (activePointerId == INVALID_POINTER) { 748d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // If we don't have a valid id, the touch down wasn't on content. 749d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 750d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 751d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int pointerIndex = MotionEventCompat.findPointerIndex(ev, activePointerId); 752d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (pointerIndex == -1) { 753d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 754d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 755d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 756d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int y = (int) MotionEventCompat.getY(ev, pointerIndex); 757d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int yDiff = Math.abs(y - mLastMotionY); 758d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (yDiff > mTouchSlop) { 759d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mIsBeingDragged = true; 760d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastMotionY = y; 761d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 762d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 763d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 764d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 765d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_DOWN: { 766d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mIsBeingDragged = false; 767d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int x = (int) ev.getX(); 768d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int y = (int) ev.getY(); 769d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (parent.isPointInChildBounds(child, x, y) && canDragAppBarLayout()) { 770d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastMotionY = y; 771d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mActivePointerId = MotionEventCompat.getPointerId(ev, 0); 772d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 773d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 774d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 775d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 776d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_CANCEL: 777d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_UP: 778d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mIsBeingDragged = false; 779d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mActivePointerId = INVALID_POINTER; 780d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 781d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 782d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 783d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return mIsBeingDragged; 784d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 785d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 786d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes @Override 787d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes public boolean onTouchEvent(CoordinatorLayout parent, AppBarLayout child, MotionEvent ev) { 788d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mTouchSlop < 0) { 789d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mTouchSlop = ViewConfiguration.get(parent.getContext()).getScaledTouchSlop(); 790d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 791d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 792d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes int x = (int) ev.getX(); 793d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes int y = (int) ev.getY(); 794d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 795d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes switch (MotionEventCompat.getActionMasked(ev)) { 796d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_DOWN: 797d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (parent.isPointInChildBounds(child, x, y) && canDragAppBarLayout()) { 798d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastMotionY = y; 799d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mActivePointerId = MotionEventCompat.getPointerId(ev, 0); 800d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } else { 801d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return false; 802d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 803d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 804d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_MOVE: 805d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final int activePointerIndex = MotionEventCompat.findPointerIndex(ev, 806d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mActivePointerId); 807d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (activePointerIndex == -1) { 808d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return false; 809d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 810d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 811d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes y = (int) MotionEventCompat.getY(ev, activePointerIndex); 812d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 813d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes int dy = mLastMotionY - y; 814d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (!mIsBeingDragged && Math.abs(dy) > mTouchSlop) { 815d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mIsBeingDragged = true; 816d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (dy > 0) { 817d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes dy -= mTouchSlop; 818d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } else { 819d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes dy += mTouchSlop; 820d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 821d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 822d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 823d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mIsBeingDragged) { 824d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastMotionY = y; 825d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // We're being dragged so scroll the ABL 826d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes scroll(parent, child, dy, -child.getDownNestedScrollRange(), 0); 827d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 828d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 829d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_UP: 830d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes case MotionEvent.ACTION_CANCEL: 831d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mIsBeingDragged = false; 832d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mActivePointerId = INVALID_POINTER; 833d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes break; 834d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 835d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 836d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return true; 83750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 83850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 83950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Override 840631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public boolean onNestedFling(final CoordinatorLayout coordinatorLayout, 841631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final AppBarLayout child, View target, float velocityX, float velocityY, 842631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes boolean consumed) { 843631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (!consumed) { 844631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // It has been consumed so let's fling ourselves 845631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return fling(coordinatorLayout, child, -child.getTotalScrollRange(), 0, -velocityY); 846631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 847631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we're scrolling up and the child also consumed the fling. We'll fake scroll 848631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // upto our 'collapsed' offset 849631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes int targetScroll; 850631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (velocityY < 0) { 851631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling down 852631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes targetScroll = -child.getTotalScrollRange() 853631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes + child.getDownNestedPreScrollRange(); 854631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 855631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (getTopBottomOffsetForScrollingSibling() > targetScroll) { 856631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we're currently expanded more than the target scroll, we'll return false 857631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // now. This is so that we don't 'scroll' the wrong way. 858631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return false; 859631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 860631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 861631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling up 862631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes targetScroll = -child.getUpNestedPreScrollRange(); 863631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 864631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (getTopBottomOffsetForScrollingSibling() < targetScroll) { 865631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we're currently expanded less than the target scroll, we'll return 866631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // false now. This is so that we don't 'scroll' the wrong way. 867631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return false; 868631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 869631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 870631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 871e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (getTopBottomOffsetForScrollingSibling() != targetScroll) { 872631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll); 873631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return true; 874631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 875631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 876631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 877631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return false; 878631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 879631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 880631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private void animateOffsetTo(final CoordinatorLayout coordinatorLayout, 881631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final AppBarLayout child, int offset) { 882631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (mAnimator == null) { 883631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator = ViewUtils.createAnimator(); 884631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.setInterpolator(AnimationUtils.DECELERATE_INTERPOLATOR); 885631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.setUpdateListener(new ValueAnimatorCompat.AnimatorUpdateListener() { 886631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 887631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void onAnimationUpdate(ValueAnimatorCompat animator) { 888631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes setAppBarTopBottomOffset(coordinatorLayout, child, 889631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes animator.getAnimatedIntValue()); 890631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 891631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes }); 892631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 893631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.cancel(); 894631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 895631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 896631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.setIntValues(getTopBottomOffsetForScrollingSibling(), offset); 897631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mAnimator.start(); 898631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 899631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 900631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private boolean fling(CoordinatorLayout coordinatorLayout, AppBarLayout layout, int minOffset, 901631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes int maxOffset, float velocityY) { 902631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (mFlingRunnable != null) { 903631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes layout.removeCallbacks(mFlingRunnable); 904631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 905631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 906631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (mScroller == null) { 907631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mScroller = ScrollerCompat.create(layout.getContext()); 908631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 909631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 910631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mScroller.fling( 911e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 0, getTopBottomOffsetForScrollingSibling(), // curr 912631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 0, Math.round(velocityY), // velocity. 913631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 0, 0, // x 914631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes minOffset, maxOffset); // y 915631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 916631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (mScroller.computeScrollOffset()) { 917631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mFlingRunnable = new FlingRunnable(coordinatorLayout, layout); 918631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes ViewCompat.postOnAnimation(layout, mFlingRunnable); 919631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return true; 920631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 921631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mFlingRunnable = null; 922631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return false; 923631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 924631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 925631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 926631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private class FlingRunnable implements Runnable { 927631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private final CoordinatorLayout mParent; 928631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private final AppBarLayout mLayout; 929631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 930631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes FlingRunnable(CoordinatorLayout parent, AppBarLayout layout) { 931631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mParent = parent; 932631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes mLayout = layout; 933631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 934631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 935631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 936631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void run() { 937631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (mLayout != null && mScroller != null && mScroller.computeScrollOffset()) { 938631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes setAppBarTopBottomOffset(mParent, mLayout, mScroller.getCurrY()); 939631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 940631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Post ourselves so that we run on the next animation 941631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes ViewCompat.postOnAnimation(mLayout, this); 942631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 943631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 944631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 945631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 946631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 9479995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public boolean onLayoutChild(CoordinatorLayout parent, AppBarLayout abl, 94850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int layoutDirection) { 9499995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes boolean handled = super.onLayoutChild(parent, abl, layoutDirection); 9509995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 9519995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int pendingAction = abl.getPendingAction(); 9529995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (pendingAction != PENDING_ACTION_NONE) { 9539995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final boolean animate = (pendingAction & PENDING_ACTION_ANIMATE_ENABLED) != 0; 9549995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if ((pendingAction & PENDING_ACTION_COLLAPSED) != 0) { 9559995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int offset = -abl.getUpNestedPreScrollRange(); 9569995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 9579995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes animateOffsetTo(parent, abl, offset); 9589995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 9599995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setAppBarTopBottomOffset(parent, abl, offset); 9609995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 9619995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if ((pendingAction & PENDING_ACTION_EXPANDED) != 0) { 9629995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 9639995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes animateOffsetTo(parent, abl, 0); 9649995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 9659995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setAppBarTopBottomOffset(parent, abl, 0); 9669995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 9679995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 9689995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if (mOffsetToChildIndexOnLayout >= 0) { 9699995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes View child = abl.getChildAt(mOffsetToChildIndexOnLayout); 970e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int offset = -child.getBottom(); 971e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (mOffsetToChildIndexOnLayoutIsMinHeight) { 972e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes offset += ViewCompat.getMinimumHeight(child); 973e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 974e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes offset += Math.round(child.getHeight() * mOffsetToChildIndexOnLayoutPerc); 975e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 976e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes setTopAndBottomOffset(offset); 977e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 97850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 97979aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes // Finally reset any pending states 98079aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes abl.resetPendingAction(); 98179aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 98279aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes 98350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Make sure we update the elevation 9849995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes dispatchOffsetUpdates(abl); 98550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 98650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return handled; 987a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 988a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 989a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int scroll(CoordinatorLayout coordinatorLayout, AppBarLayout appBarLayout, 99050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int dy, int minOffset, int maxOffset) { 991a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return setAppBarTopBottomOffset(coordinatorLayout, appBarLayout, 992e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes getTopBottomOffsetForScrollingSibling() - dy, minOffset, maxOffset); 993a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 994a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 995d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private boolean canDragAppBarLayout() { 996d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mLastNestedScrollingChildRef != null) { 997d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes final View view = mLastNestedScrollingChildRef.get(); 998d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return view != null && view.isShown() && !ViewCompat.canScrollVertically(view, -1); 999d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1000d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes return false; 1001d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1002d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 1003631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final int setAppBarTopBottomOffset(CoordinatorLayout coordinatorLayout, 1004631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes AppBarLayout appBarLayout, int newOffset) { 1005631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return setAppBarTopBottomOffset(coordinatorLayout, appBarLayout, newOffset, 1006631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes Integer.MIN_VALUE, Integer.MAX_VALUE); 1007631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 1008631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 1009631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final int setAppBarTopBottomOffset(CoordinatorLayout coordinatorLayout, 101050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes AppBarLayout appBarLayout, int newOffset, int minOffset, int maxOffset) { 1011e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int curOffset = getTopBottomOffsetForScrollingSibling(); 1012a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int consumed = 0; 1013a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1014631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (minOffset != 0 && curOffset >= minOffset && curOffset <= maxOffset) { 1015631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we have some scrolling range, and we're currently within the min and max 1016631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // offsets, calculate a new offset 101750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes newOffset = MathUtils.constrain(newOffset, minOffset, maxOffset); 1018a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1019a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (curOffset != newOffset) { 1020e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int interpolatedOffset = appBarLayout.hasChildWithInterpolator() 1021e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ? interpolateOffset(appBarLayout, newOffset) 1022e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes : newOffset; 1023e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1024e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes boolean offsetChanged = setTopAndBottomOffset(interpolatedOffset); 1025631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 1026a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update how much dy we have consumed 1027a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes consumed = curOffset - newOffset; 1028a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update the stored sibling offset 1029e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetDelta = newOffset - interpolatedOffset; 1030a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1031a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (!offsetChanged && appBarLayout.hasChildWithInterpolator()) { 1032a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If the offset hasn't changed and we're using an interpolated scroll 1033a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // then we need to keep any dependent views updated. CoL will do this for 1034a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us when we move, but we need to do it manually when we don't (as an 1035a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // interpolated scroll may finish early). 1036a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes coordinatorLayout.dispatchDependentViewsChanged(appBarLayout); 1037a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1038a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1039631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Dispatch the updates to any listeners 1040631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes dispatchOffsetUpdates(appBarLayout); 1041a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1042a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1043a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1044a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return consumed; 1045a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1046a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1047631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private void dispatchOffsetUpdates(AppBarLayout layout) { 10486f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes final List<OnOffsetChangedListener> listeners = layout.mListeners; 104950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1050631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Iterate backwards through the list so that most recently added listeners 1051631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // get the first chance to decide 1052631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes for (int i = 0, z = listeners.size(); i < z; i++) { 10536f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes final OnOffsetChangedListener listener = listeners.get(i); 1054631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (listener != null) { 1055631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes listener.onOffsetChanged(layout, getTopAndBottomOffset()); 1056a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1057a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1058a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1059a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1060a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int interpolateOffset(AppBarLayout layout, final int offset) { 1061a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int absOffset = Math.abs(offset); 1062a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1063a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 1064a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = layout.getChildAt(i); 1065a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 106650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 1067a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 106850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 1069a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 107050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int childScrollableHeight = 0; 107150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int flags = childLp.getScrollFlags(); 107250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 1073b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // We're set to scroll so add the child's height plus margin 1074b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childScrollableHeight += child.getHeight() + childLp.topMargin 1075b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes + childLp.bottomMargin; 1076b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes 107750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 1078b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // For a collapsing scroll, we to take the collapsed height 1079b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // into account. 108050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes childScrollableHeight -= ViewCompat.getMinimumHeight(child); 108150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 108250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 108350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1084ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (ViewCompat.getFitsSystemWindows(child)) { 1085ea004a01f44aaf36212120c936952c1742d03d30Chris Banes childScrollableHeight -= layout.getTopInset(); 1086ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1087ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 108850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (childScrollableHeight > 0) { 108950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int offsetForView = absOffset - child.getTop(); 109050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int interpolatedDiff = Math.round(childScrollableHeight * 109150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes interpolator.getInterpolation( 109250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes offsetForView / (float) childScrollableHeight)); 109350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 109450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return Integer.signum(offset) * (child.getTop() + interpolatedDiff); 109550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 1096a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 109750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 109850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If we get to here then the view on the offset isn't suitable for interpolated 109950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // scrolling. So break out of the loop 110050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes break; 1101a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1102a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1103a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1104a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return offset; 1105a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1106a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1107a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int getTopBottomOffsetForScrollingSibling() { 1108e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return getTopAndBottomOffset() + mOffsetDelta; 1109e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1110e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1111e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1112e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public Parcelable onSaveInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout) { 1113e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final Parcelable superState = super.onSaveInstanceState(parent, appBarLayout); 1114e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int offset = getTopAndBottomOffset(); 1115e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1116e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Try and find the first visible child... 1117e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes for (int i = 0, count = appBarLayout.getChildCount(); i < count; i++) { 1118e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes View child = appBarLayout.getChildAt(i); 1119e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int visBottom = child.getBottom() + offset; 1120e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1121e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (child.getTop() + offset <= 0 && visBottom >= 0) { 1122e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = new SavedState(superState); 1123e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibleChildIndex = i; 1124e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibileChildAtMinimumHeight = 1125e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes visBottom == ViewCompat.getMinimumHeight(child); 1126e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibileChildPercentageShown = visBottom / (float) child.getHeight(); 1127e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return ss; 1128e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1129e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1130e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1131e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Else we'll just return the super state 1132e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return superState; 1133e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1134e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1135e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1136e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void onRestoreInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout, 1137e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes Parcelable state) { 1138e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (state instanceof SavedState) { 1139e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = (SavedState) state; 1140e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, ss.getSuperState()); 1141e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = ss.firstVisibleChildIndex; 1142e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayoutPerc = ss.firstVisibileChildPercentageShown; 1143e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayoutIsMinHeight = ss.firstVisibileChildAtMinimumHeight; 1144e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 1145e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, state); 1146e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 1147e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1148e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1149e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1150e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes protected static class SavedState extends View.BaseSavedState { 1151e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int firstVisibleChildIndex; 1152e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes float firstVisibileChildPercentageShown; 1153e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes boolean firstVisibileChildAtMinimumHeight; 1154e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1155e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState(Parcel source) { 1156e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super(source); 1157e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibleChildIndex = source.readInt(); 1158e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibileChildPercentageShown = source.readFloat(); 1159e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibileChildAtMinimumHeight = source.readByte() != 0; 1160e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1161e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1162e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState(Parcelable superState) { 1163e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super(superState); 1164e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1165e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1166e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1167e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void writeToParcel(Parcel dest, int flags) { 1168e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.writeToParcel(dest, flags); 1169e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeInt(firstVisibleChildIndex); 1170e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeFloat(firstVisibileChildPercentageShown); 1171e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeByte((byte) (firstVisibileChildAtMinimumHeight ? 1 : 0)); 1172e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1173e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1174e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public static final Parcelable.Creator<SavedState> CREATOR = 1175e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes new Parcelable.Creator<SavedState>() { 1176e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1177e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState createFromParcel(Parcel source) { 1178e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return new SavedState(source); 1179e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1180e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1181e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1182e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState[] newArray(int size) { 1183e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return new SavedState[size]; 1184e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1185e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes }; 1186a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1187a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1188a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1189a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1190a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Behavior which should be used by {@link View}s which can scroll vertically and support 1191a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * nested scrolling to automatically scroll any {@link AppBarLayout} siblings. 1192a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1193a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static class ScrollingViewBehavior extends ViewOffsetBehavior<View> { 1194a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mOverlayTop; 1195a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1196a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior() {} 1197a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1198a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior(Context context, AttributeSet attrs) { 1199a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 1200a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1201a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes TypedArray a = context.obtainStyledAttributes(attrs, 1202a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes R.styleable.ScrollingViewBehavior_Params); 1203a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mOverlayTop = a.getDimensionPixelSize( 1204a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes R.styleable.ScrollingViewBehavior_Params_behavior_overlapTop, 0); 1205a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 1206a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1207a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1208a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1209a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) { 1210a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We depend on any AppBarLayouts 1211a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return dependency instanceof AppBarLayout; 1212a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1213a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1214a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1215ea004a01f44aaf36212120c936952c1742d03d30Chris Banes public boolean onMeasureChild(CoordinatorLayout parent, final View child, 1216a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int parentWidthMeasureSpec, int widthUsed, 1217a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int parentHeightMeasureSpec, int heightUsed) { 1218d6c56d929f7975eb6d80116e915ff5515a294c41Chris Banes final int childLpHeight = child.getLayoutParams().height; 1219d6c56d929f7975eb6d80116e915ff5515a294c41Chris Banes if (childLpHeight == LayoutParams.MATCH_PARENT 1220d6c56d929f7975eb6d80116e915ff5515a294c41Chris Banes || childLpHeight == LayoutParams.WRAP_CONTENT) { 1221d6c56d929f7975eb6d80116e915ff5515a294c41Chris Banes // If the child's height is set to match_parent/wrap_content then measure it 1222d6c56d929f7975eb6d80116e915ff5515a294c41Chris Banes // with the maximum visible height 1223a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1224a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final List<View> dependencies = parent.getDependencies(child); 1225a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (dependencies.isEmpty()) { 1226a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we don't have any dependencies, return false 1227a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return false; 1228a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1229a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1230a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final AppBarLayout appBar = findFirstAppBarLayout(dependencies); 1231ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (appBar != null && appBar.getVisibility() == View.VISIBLE) { 1232ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (appBar.getMeasuredHeight() <= 0 && appBar.getMeasuredWidth() <= 0) { 1233ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // The AppBar hasn't been measured yet, so we'll post a Runnable to delay 1234ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // our measure until after the ABLs has happened 1235ea004a01f44aaf36212120c936952c1742d03d30Chris Banes child.post(new Runnable() { 1236ea004a01f44aaf36212120c936952c1742d03d30Chris Banes @Override 1237ea004a01f44aaf36212120c936952c1742d03d30Chris Banes public void run() { 1238ea004a01f44aaf36212120c936952c1742d03d30Chris Banes child.requestLayout(); 1239ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1240ea004a01f44aaf36212120c936952c1742d03d30Chris Banes }); 1241ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return false; 1242ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1243ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 12446ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes if (ViewCompat.getFitsSystemWindows(appBar)) { 12456ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // If the AppBarLayout is fitting system windows then we need to also, 12466ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // otherwise we'll get CoL's compatible layout functionality 12476ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes ViewCompat.setFitsSystemWindows(child, true); 1248a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1249a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 125055f3d29c12610da3574c4f488fbc3a1c7ca790f1Chris Banes int availableHeight = MeasureSpec.getSize(parentHeightMeasureSpec); 125155f3d29c12610da3574c4f488fbc3a1c7ca790f1Chris Banes if (availableHeight == 0) { 125255f3d29c12610da3574c4f488fbc3a1c7ca790f1Chris Banes // If the measure spec doesn't specify a size, use the current height 125355f3d29c12610da3574c4f488fbc3a1c7ca790f1Chris Banes availableHeight = parent.getHeight(); 125455f3d29c12610da3574c4f488fbc3a1c7ca790f1Chris Banes } 1255ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 125655f3d29c12610da3574c4f488fbc3a1c7ca790f1Chris Banes final int height = availableHeight - appBar.getMeasuredHeight() 1257f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes + appBar.getTotalScrollRange(); 1258a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, 1259d6c56d929f7975eb6d80116e915ff5515a294c41Chris Banes childLpHeight == LayoutParams.MATCH_PARENT 1260d6c56d929f7975eb6d80116e915ff5515a294c41Chris Banes ? MeasureSpec.EXACTLY 1261d6c56d929f7975eb6d80116e915ff5515a294c41Chris Banes : MeasureSpec.AT_MOST); 1262a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1263a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Now measure the scrolling child with the correct height 1264a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes parent.onMeasureChild(child, parentWidthMeasureSpec, 1265a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes widthUsed, heightMeasureSpec, heightUsed); 1266a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1267a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return true; 1268a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1269a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1270a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return false; 1271a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1272a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1273a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 12740d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes public boolean onLayoutChild(CoordinatorLayout parent, View child, int layoutDirection) { 12750d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes // First lay out the child as normal 12760d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes super.onLayoutChild(parent, child, layoutDirection); 12770d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 12780d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes // Now offset us correctly to be in the correct position. This is important for things 12790d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes // like activity transitions which rely on accurate positioning after the first layout. 12800d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes final List<View> dependencies = parent.getDependencies(child); 12810d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes for (int i = 0, z = dependencies.size(); i < z; i++) { 12820d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes if (updateOffset(parent, child, dependencies.get(i))) { 12830d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes // If we updated the offset, break out of the loop now 12840d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes break; 12850d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 12860d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 12870d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return true; 12880d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 12890d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 12900d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes @Override 1291a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean onDependentViewChanged(CoordinatorLayout parent, View child, 1292a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View dependency) { 12930d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes updateOffset(parent, child, dependency); 12940d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return false; 12950d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 12960d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 12970d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes private boolean updateOffset(CoordinatorLayout parent, View child, View dependency) { 1298a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final CoordinatorLayout.Behavior behavior = 1299a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes ((CoordinatorLayout.LayoutParams) dependency.getLayoutParams()).getBehavior(); 1300a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (behavior instanceof Behavior) { 1301a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Offset the child so that it is below the app-bar (with any overlap) 1302ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int offset = ((Behavior) behavior).getTopBottomOffsetForScrollingSibling(); 1303ea004a01f44aaf36212120c936952c1742d03d30Chris Banes setTopAndBottomOffset(dependency.getHeight() + offset 1304ea004a01f44aaf36212120c936952c1742d03d30Chris Banes - getOverlapForOffset(dependency, offset)); 13050d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return true; 1306ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1307ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return false; 1308ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1309ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 1310ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getOverlapForOffset(final View dependency, final int offset) { 1311ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (mOverlayTop != 0 && dependency instanceof AppBarLayout) { 1312ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final AppBarLayout abl = (AppBarLayout) dependency; 1313ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int totalScrollRange = abl.getTotalScrollRange(); 1314ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int preScrollDown = abl.getDownNestedPreScrollRange(); 1315a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1316ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (preScrollDown != 0 && (totalScrollRange + offset) <= preScrollDown) { 1317ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // If we're in a pre-scroll down. Don't use the offset at all. 1318ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return 0; 1319a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 1320ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int availScrollRange = totalScrollRange - preScrollDown; 1321ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (availScrollRange == 0) { 1322ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Else we'll use a interpolated ratio of the overlap, depending on offset 1323ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final float percScrolled = offset / (float) availScrollRange; 1324ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return MathUtils.constrain( 1325ea004a01f44aaf36212120c936952c1742d03d30Chris Banes Math.round((1f + percScrolled) * mOverlayTop), 0, mOverlayTop); 1326ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1327a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1328a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1329ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mOverlayTop; 1330a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1331a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1332a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1333a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the distance that this view should overlap any {@link AppBarLayout}. 1334a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 1335a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param overlayTop the distance in px 1336a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1337a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setOverlayTop(int overlayTop) { 1338a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mOverlayTop = overlayTop; 1339a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1340a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1341a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1342a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the distance that this view should overlap any {@link AppBarLayout}. 1343a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1344a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public int getOverlayTop() { 1345a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mOverlayTop; 1346a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1347a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1348a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private static AppBarLayout findFirstAppBarLayout(List<View> views) { 1349a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = views.size(); i < z; i++) { 1350a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View view = views.get(i); 1351a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (view instanceof AppBarLayout) { 1352a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return (AppBarLayout) view; 1353a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1354a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1355a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return null; 1356a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1357a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1358a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes} 1359