AppBarLayout.java revision 19a80415a88ecfae6bbc645cd14b653ed4337648
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; 211a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banesimport android.os.Build; 22e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banesimport android.os.Parcel; 23e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banesimport android.os.Parcelable; 2450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport android.support.annotation.IntDef; 2572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banesimport android.support.annotation.NonNull; 2672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banesimport android.support.annotation.Nullable; 2713633353237d6506f4c436b459bc8be8c3d7ed68Chris Banesimport android.support.annotation.VisibleForTesting; 28a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.support.design.R; 2962ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banesimport android.support.v4.os.ParcelableCompat; 3062ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banesimport android.support.v4.os.ParcelableCompatCreatorCallbacks; 3105f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banesimport android.support.v4.view.AbsSavedState; 32a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.support.v4.view.ViewCompat; 336ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banesimport android.support.v4.view.WindowInsetsCompat; 34a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.util.AttributeSet; 35a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.View; 36a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.ViewGroup; 37a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.view.animation.Interpolator; 38a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport android.widget.LinearLayout; 39a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 4050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.Retention; 4150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banesimport java.lang.annotation.RetentionPolicy; 42d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banesimport java.lang.ref.WeakReference; 43631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banesimport java.util.ArrayList; 44a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banesimport java.util.List; 45a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 4619a80415a88ecfae6bbc645cd14b653ed4337648Chris Banesimport static android.support.design.widget.ViewUtils.objectEquals; 4719a80415a88ecfae6bbc645cd14b653ed4337648Chris Banes 48a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes/** 49a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * AppBarLayout is a vertical {@link LinearLayout} which implements many of the features of 509fb154338a62edc2c57dc036895199d6f1769400Chris Banes * material designs app bar concept, namely scrolling gestures. 51a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 52a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Children should provide their desired scrolling behavior through 53a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams#setScrollFlags(int)} and the associated layout xml attribute: 54a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@code app:layout_scrollFlags}. 55a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 56a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 57a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * This view depends heavily on being used as a direct child within a {@link CoordinatorLayout}. 58a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * If you use AppBarLayout within a different {@link ViewGroup}, most of it's functionality will 59a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * not work. 60a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 619fb154338a62edc2c57dc036895199d6f1769400Chris Banes * AppBarLayout also requires a separate scrolling sibling in order to know when to scroll. 629fb154338a62edc2c57dc036895199d6f1769400Chris Banes * The binding is done through the {@link ScrollingViewBehavior} behavior class, meaning that you 639fb154338a62edc2c57dc036895199d6f1769400Chris Banes * should set your scrolling view's behavior to be an instance of {@link ScrollingViewBehavior}. 649fb154338a62edc2c57dc036895199d6f1769400Chris Banes * A string resource containing the full class name is available. 65a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 66a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <pre> 67a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.CoordinatorLayout 68a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:android="http://schemas.android.com/apk/res/android" 69a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:app="http://schemas.android.com/apk/res-auto" 70a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 71a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent"> 72a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 73a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v4.widget.NestedScrollView 74a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 75a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent" 76a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_behavior="@string/appbar_scrolling_view_behavior"> 77a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 78a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <!-- Your scrolling content --> 79a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 80a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.v4.widget.NestedScrollView> 81a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 82a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.AppBarLayout 83a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="wrap_content" 84a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent"> 85a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 86a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v7.widget.Toolbar 87a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 88a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 89a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 90a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.TabLayout 91a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 92a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 93a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 94a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.AppBarLayout> 95a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 96a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.CoordinatorLayout> 97a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </pre> 98a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 99a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see <a href="http://www.google.com/design/spec/layout/structure.html#structure-app-bar"> 100a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * http://www.google.com/design/spec/layout/structure.html#structure-app-bar</a> 101a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 102a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes@CoordinatorLayout.DefaultBehavior(AppBarLayout.Behavior.class) 103a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banespublic class AppBarLayout extends LinearLayout { 104a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1059995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_NONE = 0x0; 1069995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_EXPANDED = 0x1; 1079995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_COLLAPSED = 0x2; 1089995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_ANIMATE_ENABLED = 0x4; 1099995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 110a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 111631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Interface definition for a callback to be invoked when an {@link AppBarLayout}'s vertical 112631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * offset changes. 113a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 114631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public interface OnOffsetChangedListener { 115a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 116a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Called when the {@link AppBarLayout}'s layout offset has been changed. This allows 117a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * child views to implement custom behavior based on the offset (for instance pinning a 118a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * view at a certain y value). 119a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 120631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param appBarLayout the {@link AppBarLayout} which offset has changed 12150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes * @param verticalOffset the vertical offset for the parent {@link AppBarLayout}, in px 122a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 123631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset); 124a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 125a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 126a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private static final int INVALID_SCROLL_RANGE = -1; 127a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 128a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mTotalScrollRange = INVALID_SCROLL_RANGE; 129a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownPreScrollRange = INVALID_SCROLL_RANGE; 130a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownScrollRange = INVALID_SCROLL_RANGE; 131a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1321a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mHaveChildWithInterpolator; 13350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1349995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private int mPendingAction = PENDING_ACTION_NONE; 1359995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 1366ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes private WindowInsetsCompat mLastInsets; 1376ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 1381a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private List<OnOffsetChangedListener> mListeners; 1391a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1401a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mCollapsible; 1411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mCollapsed; 1421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private final int[] mTmpStatesArray = new int[2]; 144631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 145a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context) { 146a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes this(context, null); 147a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 148a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 149a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context, AttributeSet attrs) { 150a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 151a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes setOrientation(VERTICAL); 15250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 153809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes ThemeUtils.checkAppCompatTheme(context); 154809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes 1551a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21) { 1561a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Use the bounds view outline provider so that we cast a shadow, even without a 1571a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // background 1581a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setBoundsViewOutlineProvider(this); 1591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // If we're running on API 21+, we should reset any state list animator from our 1611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // default style 1621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setStateListAnimatorFromAttrs(this, attrs, 0, 1631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes R.style.Widget_Design_AppBarLayout); 1641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 1651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AppBarLayout, 16750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 0, R.style.Widget_Design_AppBarLayout); 16881520564f3dd783136e025174021ba4eabd6ff3cChris Banes setBackgroundDrawable(a.getDrawable(R.styleable.AppBarLayout_android_background)); 1699995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (a.hasValue(R.styleable.AppBarLayout_expanded)) { 1709995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(a.getBoolean(R.styleable.AppBarLayout_expanded, false)); 1719995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 1721a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21 && a.hasValue(R.styleable.AppBarLayout_elevation)) { 1731a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setDefaultAppBarLayoutStateListAnimator( 1741a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes this, a.getDimensionPixelSize(R.styleable.AppBarLayout_elevation, 0)); 1751a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 17650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes a.recycle(); 17750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1786ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes ViewCompat.setOnApplyWindowInsetsListener(this, 1796ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes new android.support.v4.view.OnApplyWindowInsetsListener() { 1806ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes @Override 1816ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public WindowInsetsCompat onApplyWindowInsets(View v, 1826ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes WindowInsetsCompat insets) { 1838818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes return onWindowInsetChanged(insets); 1846ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 1856ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes }); 186631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 187631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 188631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 189631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Add a listener that will be called when the offset of this {@link AppBarLayout} changes. 190631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 191631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener The listener that will be called when the offset changes.] 192631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 193631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @see #removeOnOffsetChangedListener(OnOffsetChangedListener) 194631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 195631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void addOnOffsetChangedListener(OnOffsetChangedListener listener) { 1961a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners == null) { 1971a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mListeners = new ArrayList<>(); 1981a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 1996f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes if (listener != null && !mListeners.contains(listener)) { 2006f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.add(listener); 201631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 202631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 203631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 204631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 205631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Remove the previously added {@link OnOffsetChangedListener}. 206631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 207631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener the listener to remove. 208631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 209631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void removeOnOffsetChangedListener(OnOffsetChangedListener listener) { 2101a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners != null && listener != null) { 2116f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.remove(listener); 212631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 213a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 214a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 215a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 216ea004a01f44aaf36212120c936952c1742d03d30Chris Banes protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 217ea004a01f44aaf36212120c936952c1742d03d30Chris Banes super.onMeasure(widthMeasureSpec, heightMeasureSpec); 218ea004a01f44aaf36212120c936952c1742d03d30Chris Banes invalidateScrollRanges(); 219ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 220ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 221ea004a01f44aaf36212120c936952c1742d03d30Chris Banes @Override 222a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected void onLayout(boolean changed, int l, int t, int r, int b) { 223a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.onLayout(changed, l, t, r, b); 22479aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes invalidateScrollRanges(); 225a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 226a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = false; 227a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 228a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 229a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 230a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 231a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 232a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 233a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = true; 234a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 235a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 236a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 2371a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 2381a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes updateCollapsible(); 2391a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2401a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 2411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private void updateCollapsible() { 2421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes boolean haveCollapsibleChild = false; 2431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 2441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (((LayoutParams) getChildAt(i).getLayoutParams()).isCollapsible()) { 2451a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes haveCollapsibleChild = true; 2461a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes break; 2471a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2481a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 24957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes setCollapsibleState(haveCollapsibleChild); 250a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 251a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 252ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void invalidateScrollRanges() { 253ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Invalidate the scroll ranges 254ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mTotalScrollRange = INVALID_SCROLL_RANGE; 255ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownPreScrollRange = INVALID_SCROLL_RANGE; 256ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownScrollRange = INVALID_SCROLL_RANGE; 257ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 258ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 259a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 260a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setOrientation(int orientation) { 261a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (orientation != VERTICAL) { 262a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes throw new IllegalArgumentException("AppBarLayout is always vertical and does" 263a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes + " not support horizontal orientation"); 264a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 265a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.setOrientation(orientation); 266a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 267a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 2689995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2699995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not, animating if it has already 2709995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * been laid out. 2719995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2729995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2739995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2749995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2759995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2769995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2779995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2789995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2799995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2809995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded) { 2819995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(expanded, ViewCompat.isLaidOut(this)); 2829995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 2839995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 2849995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2859995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not. 2869995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2879995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2889995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2899995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2909995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2919995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2929995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param animate Whether to animate to the new state 2939995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2949995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2959995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2969995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded, boolean animate) { 2979995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = (expanded ? PENDING_ACTION_EXPANDED : PENDING_ACTION_COLLAPSED) 2989995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes | (animate ? PENDING_ACTION_ANIMATE_ENABLED : 0); 2999995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes requestLayout(); 3009995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 3019995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 302a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 303a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 304a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return p instanceof LayoutParams; 305a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 306a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 307a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 308a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateDefaultLayoutParams() { 309a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 310a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 311a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 312a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 313a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams generateLayoutParams(AttributeSet attrs) { 314a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(getContext(), attrs); 315a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 316a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 317a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 318a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 319a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (p instanceof LinearLayout.LayoutParams) { 320a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((LinearLayout.LayoutParams) p); 321a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (p instanceof MarginLayoutParams) { 322a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((MarginLayoutParams) p); 323a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 324a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(p); 325a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 326a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 327ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private boolean hasChildWithInterpolator() { 328a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mHaveChildWithInterpolator; 329a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 330a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 331a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 3326ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes * Returns the scroll range of all children. 333a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 334a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @return the scroll range in px 335a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 3366ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public final int getTotalScrollRange() { 337a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mTotalScrollRange != INVALID_SCROLL_RANGE) { 338a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mTotalScrollRange; 339a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 340a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 341a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 342a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 343a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 344a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 345ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 346a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 347a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 348a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 349a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 350b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += childHeight + lp.topMargin + lp.bottomMargin; 351a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 352a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 353a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing scroll, we to take the collapsed height into account. 3546ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // We also break straight away since later views can't scroll beneath 355a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us 3566ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes range -= ViewCompat.getMinimumHeight(child); 3576ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes break; 358a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 359a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 360a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 361a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 362a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 363a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 364a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 3654832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes return mTotalScrollRange = Math.max(0, range - getTopInset()); 366a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 367a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 368ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private boolean hasScrollableChildren() { 369a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return getTotalScrollRange() != 0; 370a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 371a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 372a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 373a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling up from a nested pre-scroll. 374a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 375ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getUpNestedPreScrollRange() { 37650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return getTotalScrollRange(); 377a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 378a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 379a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 380a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested pre-scroll. 381a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 382ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getDownNestedPreScrollRange() { 383a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownPreScrollRange != INVALID_SCROLL_RANGE) { 384a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 385a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownPreScrollRange; 386a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 387a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 388a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 389a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = getChildCount() - 1; i >= 0; i--) { 390a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 391a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 392ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 393a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 394a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 395a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.FLAG_QUICK_RETURN) == LayoutParams.FLAG_QUICK_RETURN) { 396b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // First take the margin into account 397b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += lp.topMargin + lp.bottomMargin; 398a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // The view has the quick return flag combination... 399a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED) != 0) { 400a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If they're set to enter collapsed, use the minimum height 401a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += ViewCompat.getMinimumHeight(child); 40247543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes } else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 40347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // Only enter by the amount of the collapsed height 40447543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes range += childHeight - ViewCompat.getMinimumHeight(child); 405a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 406a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Else use the full height 407a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 408a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 409a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (range > 0) { 410a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we've hit an non-quick return scrollable view, and we've already hit a 411a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // quick return view, return now 412a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 413a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 414a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 41513633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes return mDownPreScrollRange = Math.max(0, range); 416a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 417a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 418a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 419a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested scroll. 420a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 421ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getDownNestedScrollRange() { 422a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownScrollRange != INVALID_SCROLL_RANGE) { 423a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 424a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownScrollRange; 425a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 426a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 427a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 428c1ce4f6cf4d99d6856c4259bf1bb1cb56f604737Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 429a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 430a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 431ea004a01f44aaf36212120c936952c1742d03d30Chris Banes int childHeight = child.getMeasuredHeight(); 432b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childHeight += lp.topMargin + lp.bottomMargin; 433a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 434a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 435a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 436a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 437a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 438a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 439a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 440a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 441a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing exit scroll, we to take the collapsed height into account. 4424832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes // We also break the range straight away since later views can't scroll 443a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // beneath us 4444832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes range -= ViewCompat.getMinimumHeight(child) + getTopInset(); 4454832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes break; 446a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 447a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 448a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 449a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 450a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 451a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 452a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 4534c33be829067714342b629d29329206bc2116afeChris Banes return mDownScrollRange = Math.max(0, range); 454a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 455a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 4561a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private void dispatchOffsetUpdates(int offset) { 4571a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Iterate backwards through the list so that most recently added listeners 4581a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // get the first chance to decide 4591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners != null) { 4601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = mListeners.size(); i < z; i++) { 4611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final OnOffsetChangedListener listener = mListeners.get(i); 4621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (listener != null) { 4631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes listener.onOffsetChanged(this, offset); 4641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4671a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4681a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 46950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int getMinimumHeightForVisibleOverlappingContent() { 47017ed3263761329f6aa6796941358c41001fff325Chris Banes final int topInset = getTopInset(); 47150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int minHeight = ViewCompat.getMinimumHeight(this); 47250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (minHeight != 0) { 47350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If this layout has a min height, use it (doubled) 4746ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes return (minHeight * 2) + topInset; 47550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 47650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 47750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Otherwise, we'll use twice the min height of our last child 47850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int childCount = getChildCount(); 479b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes final int lastChildMinHeight = childCount >= 1 480b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes ? ViewCompat.getMinimumHeight(getChildAt(childCount - 1)) : 0; 481b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes if (lastChildMinHeight != 0) { 482b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes return (lastChildMinHeight * 2) + topInset; 483b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes } 484b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes 485b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes // If we reach here then we don't have a min height explicitly set. Instead we'll take a 486b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes // guess at 1/3 of our height being visible 487b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes return getHeight() / 3; 48850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 48950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 4901a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Override 4911a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes protected int[] onCreateDrawableState(int extraSpace) { 4921a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int[] extraStates = mTmpStatesArray; 4931a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int[] states = super.onCreateDrawableState(extraSpace + extraStates.length); 4941a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 4951a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes extraStates[0] = mCollapsible ? R.attr.state_collapsible : -R.attr.state_collapsible; 4961a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes extraStates[1] = mCollapsible && mCollapsed 4971a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ? R.attr.state_collapsed : -R.attr.state_collapsed; 4981a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 4991a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return mergeDrawableStates(states, extraStates); 5001a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5011a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 50257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private void setCollapsibleState(boolean collapsible) { 5031a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mCollapsible != collapsible) { 5041a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mCollapsible = collapsible; 5051a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes refreshDrawableState(); 5061a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5071a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5081a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 50957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private void setCollapsedState(boolean collapsed) { 5101a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mCollapsed != collapsed) { 5111a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mCollapsed = collapsed; 5121a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes refreshDrawableState(); 5131a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5141a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5151a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 51650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** 5171a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @deprecated target elevation is now deprecated. AppBarLayout's elevation is now 518926cd28257536b1206934d69585a2dab100147d5Chris Banes * controlled via a {@link android.animation.StateListAnimator}. If a target 519c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas * elevation is set, either by this method or the {@code app:elevation} attribute, 520926cd28257536b1206934d69585a2dab100147d5Chris Banes * a new state list animator is created which uses the given {@code elevation} value. 521631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 5221a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_elevation 52350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes */ 5241a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Deprecated 525631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void setTargetElevation(float elevation) { 5261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21) { 5271a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setDefaultAppBarLayoutStateListAnimator(this, elevation); 5281a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 529631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 530631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 531631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 5321a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @deprecated target elevation is now deprecated. AppBarLayout's elevation is now 533926cd28257536b1206934d69585a2dab100147d5Chris Banes * controlled via a {@link android.animation.StateListAnimator}. This method now 534926cd28257536b1206934d69585a2dab100147d5Chris Banes * always returns 0. 535631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 5361a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Deprecated 537631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public float getTargetElevation() { 5381a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return 0; 53950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 54050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 541ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getPendingAction() { 5429995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes return mPendingAction; 5439995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 5449995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 545ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void resetPendingAction() { 5469995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = PENDING_ACTION_NONE; 5479995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 5489995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 54913633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes @VisibleForTesting 55013633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes final int getTopInset() { 551ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0; 552ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 553ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 5548818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes private WindowInsetsCompat onWindowInsetChanged(final WindowInsetsCompat insets) { 5558818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes WindowInsetsCompat newInsets = null; 5568818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 5578818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes if (ViewCompat.getFitsSystemWindows(this)) { 5588818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes // If we're set to fit system windows, keep the insets 5598818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes newInsets = insets; 5608818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes } 5618818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 5628818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes // If our insets have changed, keep them and invalidate the scroll ranges... 56319a80415a88ecfae6bbc645cd14b653ed4337648Chris Banes if (!objectEquals(mLastInsets, newInsets)) { 5648818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes mLastInsets = newInsets; 5658818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes invalidateScrollRanges(); 5668818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes } 5678818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 56817ed3263761329f6aa6796941358c41001fff325Chris Banes return insets; 5696ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 5706ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 571a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static class LayoutParams extends LinearLayout.LayoutParams { 57250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 57350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** @hide */ 57450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @IntDef(flag=true, value={ 57550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_SCROLL, 57650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_EXIT_UNTIL_COLLAPSED, 57750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_ENTER_ALWAYS, 578bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED, 579bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_SNAP 58050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes }) 58150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Retention(RetentionPolicy.SOURCE) 58250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public @interface ScrollFlags {} 58350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 584a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 585a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The view will be scroll in direct relation to scroll events. This flag needs to be 586a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * set for any of the other flags to take effect. If any sibling views 587a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * before this one do not have this flag, then this value has no effect. 588a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 589a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_SCROLL = 0x1; 590a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 591a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 592a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When exiting (scrolling off screen) the view will be scrolled until it is 593a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 'collapsed'. The collapsed height is defined by the view's minimum height. 594a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 595a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 596a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 597a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 598a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_EXIT_UNTIL_COLLAPSED = 0x2; 599a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 600a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 601a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When entering (scrolling on screen) the view will scroll on any downwards 602a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll event, regardless of whether the scrolling view is also scrolling. This 603a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * is commonly referred to as the 'quick return' pattern. 604a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 605a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS = 0x4; 606a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 607a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 608a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * An additional flag for 'enterAlways' which modifies the returning view to 609a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * only initially scroll back to it's collapsed height. Once the scrolling view has 610a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * reached the end of it's scroll range, the remainder of this view will be scrolled 611a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * into view. The collapsed height is defined by the view's minimum height. 612a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 613a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 614a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 615a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 616a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED = 0x8; 617a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 618a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 619bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Upon a scroll ending, if the view is only partially visible then it will be snapped 620bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * and scrolled to it's closest edge. For example, if the view only has it's bottom 25% 621bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * displayed, it will be scrolled off screen completely. Conversely, if it's bottom 75% 622bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * is visible then it will be scrolled fully into view. 623bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes */ 624bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public static final int SCROLL_FLAG_SNAP = 0x10; 625bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 626bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes /** 627bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Internal flags which allows quick checking features 628a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 629a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes static final int FLAG_QUICK_RETURN = SCROLL_FLAG_SCROLL | SCROLL_FLAG_ENTER_ALWAYS; 630bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes static final int FLAG_SNAP = SCROLL_FLAG_SCROLL | SCROLL_FLAG_SNAP; 6311a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes static final int COLLAPSIBLE_FLAGS = SCROLL_FLAG_EXIT_UNTIL_COLLAPSED 6321a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes | SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED; 633a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 634a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int mScrollFlags = SCROLL_FLAG_SCROLL; 635a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes Interpolator mScrollInterpolator; 636a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 637a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(Context c, AttributeSet attrs) { 638a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(c, attrs); 639c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.AppBarLayout_Layout); 640c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes mScrollFlags = a.getInt(R.styleable.AppBarLayout_Layout_layout_scrollFlags, 0); 641c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes if (a.hasValue(R.styleable.AppBarLayout_Layout_layout_scrollInterpolator)) { 642a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int resId = a.getResourceId( 643c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes R.styleable.AppBarLayout_Layout_layout_scrollInterpolator, 0); 644a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = android.view.animation.AnimationUtils.loadInterpolator( 645a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes c, resId); 646a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 647a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 648a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 649a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 650a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height) { 651a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height); 652a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 653a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 654a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height, float weight) { 655a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height, weight); 656a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 657a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 658a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(ViewGroup.LayoutParams p) { 659a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(p); 660a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 661a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 662a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(MarginLayoutParams source) { 663a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 664a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 665a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 666a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LinearLayout.LayoutParams source) { 667a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 668a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 669a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 670a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LayoutParams source) { 671a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 672a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = source.mScrollFlags; 673a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = source.mScrollInterpolator; 674a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 675a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 676a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 677a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the scrolling flags. 678a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 679a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param flags bitwise int of {@link #SCROLL_FLAG_SCROLL}, 680bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_EXIT_UNTIL_COLLAPSED}, {@link #SCROLL_FLAG_ENTER_ALWAYS}, 681bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED} and {@link #SCROLL_FLAG_SNAP }. 682a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 683a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollFlags() 684a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 68573e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollFlags 686a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 68750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public void setScrollFlags(@ScrollFlags int flags) { 688a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = flags; 689a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 690a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 691a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 692a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the scrolling flags. 693a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 694a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollFlags(int) 695a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 69673e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollFlags 697a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 69850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @ScrollFlags 699a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public int getScrollFlags() { 700a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollFlags; 701a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 702a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 703a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 704a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the interpolator to when scrolling the view associated with this 705a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. 706a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 707a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param interpolator the interpolator to use, or null to use normal 1-to-1 scrolling. 708a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 70973e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollInterpolator 710a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollInterpolator() 711a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 712a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setScrollInterpolator(Interpolator interpolator) { 713a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = interpolator; 714a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 715a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 716a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 717a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the {@link Interpolator} being used for scrolling the view associated with this 718a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. Null indicates 'normal' 1-to-1 scrolling. 719a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 72073e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollInterpolator 721a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollInterpolator(Interpolator) 722a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 723a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Interpolator getScrollInterpolator() { 724a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollInterpolator; 725a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 7261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 7271a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes /** 7281a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * Returns true if the scroll flags are compatible for 'collapsing' 7291a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes */ 7301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean isCollapsible() { 7311a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return (mScrollFlags & SCROLL_FLAG_SCROLL) == SCROLL_FLAG_SCROLL 7321a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes && (mScrollFlags & COLLAPSIBLE_FLAGS) != 0; 7331a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 734a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 735a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 736a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 737a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The default {@link Behavior} for {@link AppBarLayout}. Implements the necessary nested 738a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll handling with offsetting. 739a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 740ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class Behavior extends HeaderBehavior<AppBarLayout> { 74157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private static final int MAX_OFFSET_ANIMATION_DURATION = 600; // ms 742e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private static final int INVALID_POSITION = -1; 743e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 74472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 74572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Callback to allow control over any {@link AppBarLayout} dragging. 74672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 74772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public static abstract class DragCallback { 74872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 74972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Allows control over whether the given {@link AppBarLayout} can be dragged or not. 75072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 75172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * <p>Dragging is defined as a direct touch on the AppBarLayout with movement. This 75272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * call does not affect any nested scrolling.</p> 75372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 75472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * @return true if we are in a position to scroll the AppBarLayout via a drag, false 75572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * if not. 75672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 75772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public abstract boolean canDrag(@NonNull AppBarLayout appBarLayout); 75872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 75972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 760e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetDelta; 761a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 76250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes private boolean mSkipNestedPreScroll; 76347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes private boolean mWasNestedFlung; 764631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 765c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov private ValueAnimatorCompat mOffsetAnimator; 76650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 767e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetToChildIndexOnLayout = INVALID_POSITION; 768e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private boolean mOffsetToChildIndexOnLayoutIsMinHeight; 769e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private float mOffsetToChildIndexOnLayoutPerc; 770e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 771d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private WeakReference<View> mLastNestedScrollingChildRef; 77272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes private DragCallback mOnDragCallback; 773d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 774a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior() {} 775a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 776a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior(Context context, AttributeSet attrs) { 777a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 778a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 779a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 780a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 781ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes public boolean onStartNestedScroll(CoordinatorLayout parent, AppBarLayout child, 782a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View directTargetChild, View target, int nestedScrollAxes) { 783f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // Return true if we're nested scrolling vertically, and we have scrollable children 784f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // and the scrolling view is big enough to scroll 785631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final boolean started = (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0 786f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes && child.hasScrollableChildren() 787ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes && parent.getHeight() - directTargetChild.getHeight() <= child.getHeight(); 788631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 789c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (started && mOffsetAnimator != null) { 790631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Cancel any offset animation 791c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 792631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 793631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 794d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // A new nested scroll has started so clear out the previous ref 795d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = null; 796d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 797631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return started; 798a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 799a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 800a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 801a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 802a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dx, int dy, int[] consumed) { 80350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy != 0 && !mSkipNestedPreScroll) { 80450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int min, max; 80550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy < 0) { 80650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling down 80750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getTotalScrollRange(); 80850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = min + child.getDownNestedPreScrollRange(); 80950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 81050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling up 81150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getUpNestedPreScrollRange(); 81250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = 0; 81350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 81450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes consumed[1] = scroll(coordinatorLayout, child, dy, min, max); 815a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 816a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 817a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 818a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 819a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 820a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dxConsumed, int dyConsumed, 821a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int dxUnconsumed, int dyUnconsumed) { 82250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dyUnconsumed < 0) { 82350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If the scrolling view is scrolling down but not consuming, it's probably be at 82450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // the top of it's content 82550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes scroll(coordinatorLayout, child, dyUnconsumed, 82650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes -child.getDownNestedScrollRange(), 0); 82750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Set the expanding flag so that onNestedPreScroll doesn't handle any events 82850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = true; 82950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 83050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // As we're no longer handling nested scrolls, reset the skip flag 83150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 832a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 83350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 834a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 83550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Override 836bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout abl, 83750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes View target) { 83847543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes if (!mWasNestedFlung) { 839bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we haven't been flung then let's see if the current view has been set to snap 840bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes snapToChildIfNeeded(coordinatorLayout, abl); 841bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 842bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 843bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // Reset the flags 84450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 84547543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes mWasNestedFlung = false; 846d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // Keep a reference to the previous nested scrolling child 847d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = new WeakReference<>(target); 848d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 849d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 850d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes @Override 851631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public boolean onNestedFling(final CoordinatorLayout coordinatorLayout, 852631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final AppBarLayout child, View target, float velocityX, float velocityY, 853631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes boolean consumed) { 854bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes boolean flung = false; 855bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 856631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (!consumed) { 857631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // It has been consumed so let's fling ourselves 858bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = fling(coordinatorLayout, child, -child.getTotalScrollRange(), 859bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 0, -velocityY); 860631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 861631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we're scrolling up and the child also consumed the fling. We'll fake scroll 862c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas // up to our 'collapsed' offset 863631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (velocityY < 0) { 864631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling down 865bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int targetScroll = -child.getTotalScrollRange() 866631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes + child.getDownNestedPreScrollRange(); 867bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (getTopBottomOffsetForScrollingSibling() < targetScroll) { 868bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we're currently not expanded more than the target scroll, we'll 869bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // animate a fling 87057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll, velocityY); 871bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = true; 872631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 873631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 874631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling up 875bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int targetScroll = -child.getUpNestedPreScrollRange(); 876bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (getTopBottomOffsetForScrollingSibling() > targetScroll) { 877bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we're currently not expanded less than the target scroll, we'll 878bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // animate a fling 87957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll, velocityY); 880bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = true; 881631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 882631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 883631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 884631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 88547543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes mWasNestedFlung = flung; 886bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes return flung; 887631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 888631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 88972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 89072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Set a callback to control any {@link AppBarLayout} dragging. 89172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 89272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * @param callback the callback to use, or {@code null} to use the default behavior. 89372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 89472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public void setDragCallback(@Nullable DragCallback callback) { 89572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes mOnDragCallback = callback; 89672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 89772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 898631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private void animateOffsetTo(final CoordinatorLayout coordinatorLayout, 89957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final AppBarLayout child, final int offset, float velocity) { 90057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final int distance = Math.abs(getTopBottomOffsetForScrollingSibling() - offset); 90157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 90257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final int duration; 90357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes velocity = Math.abs(velocity); 90457aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes if (velocity > 0) { 90557aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes duration = 3 * Math.round(1000 * (distance / velocity)); 90657aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } else { 90757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final float distanceRatio = (float) distance / child.getHeight(); 90857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes duration = (int) ((distanceRatio + 1) * 150); 90957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } 91057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 91157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetWithDuration(coordinatorLayout, child, offset, duration); 91257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } 91357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 91457aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private void animateOffsetWithDuration(final CoordinatorLayout coordinatorLayout, 91557aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final AppBarLayout child, final int offset, final int duration) { 916dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes final int currentOffset = getTopBottomOffsetForScrollingSibling(); 917dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes if (currentOffset == offset) { 918c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (mOffsetAnimator != null && mOffsetAnimator.isRunning()) { 919c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 920dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 921dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes return; 922dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 923dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 924c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (mOffsetAnimator == null) { 925c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator = ViewUtils.createAnimator(); 926c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setInterpolator(AnimationUtils.DECELERATE_INTERPOLATOR); 927c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setUpdateListener(new ValueAnimatorCompat.AnimatorUpdateListener() { 928631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 929631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void onAnimationUpdate(ValueAnimatorCompat animator) { 930ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(coordinatorLayout, child, 931631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes animator.getAnimatedIntValue()); 932631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 933631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes }); 934631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 935c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 936631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 937631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 93857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes mOffsetAnimator.setDuration(Math.min(duration, MAX_OFFSET_ANIMATION_DURATION)); 939c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setIntValues(currentOffset, offset); 940c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.start(); 941631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 942631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 943108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes private int getChildIndexOnOffset(AppBarLayout abl, final int offset) { 944bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes for (int i = 0, count = abl.getChildCount(); i < count; i++) { 945bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes View child = abl.getChildAt(i); 946bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (child.getTop() <= -offset && child.getBottom() >= -offset) { 947108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return i; 948bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 949bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 950108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return -1; 951bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 952bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 953bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes private void snapToChildIfNeeded(CoordinatorLayout coordinatorLayout, AppBarLayout abl) { 954bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int offset = getTopBottomOffsetForScrollingSibling(); 955108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int offsetChildIndex = getChildIndexOnOffset(abl, offset); 956108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offsetChildIndex >= 0) { 957108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final View offsetChild = abl.getChildAt(offsetChildIndex); 958bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final LayoutParams lp = (LayoutParams) offsetChild.getLayoutParams(); 959108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int flags = lp.getScrollFlags(); 960108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 961108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if ((flags & LayoutParams.FLAG_SNAP) == LayoutParams.FLAG_SNAP) { 962bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // We're set the snap, so animate the offset to the nearest edge 963108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes int snapTop = -offsetChild.getTop(); 964108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes int snapBottom = -offsetChild.getBottom(); 965108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 966108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offsetChildIndex == abl.getChildCount() - 1) { 967108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If this is the last child, we need to take the top inset into account 968108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom += abl.getTopInset(); 969108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 970dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 971108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (checkFlag(flags, LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED)) { 972108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If the view is set only exit until it is collapsed, we'll abide by that 973108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom += ViewCompat.getMinimumHeight(offsetChild); 974108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } else if (checkFlag(flags, LayoutParams.FLAG_QUICK_RETURN 975108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes | LayoutParams.SCROLL_FLAG_ENTER_ALWAYS)) { 976108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If it's set to always enter collapsed, it actually has two states. We 977108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // select the state and then snap within the state 978108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int seam = snapBottom + ViewCompat.getMinimumHeight(offsetChild); 979108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offset < seam) { 980108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapTop = seam; 981108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } else { 982108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom = seam; 983108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 984dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 985dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 986108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int newOffset = offset < (snapBottom + snapTop) / 2 987108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes ? snapBottom 988108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes : snapTop; 989bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes animateOffsetTo(coordinatorLayout, abl, 99057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes MathUtils.constrain(newOffset, -abl.getTotalScrollRange(), 0), 0); 991bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 992bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 993bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 994bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 995108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes private static boolean checkFlag(final int flags, final int check) { 996108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return (flags & check) == check; 997108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 998108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 999631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 1000bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes public boolean onMeasureChild(CoordinatorLayout parent, AppBarLayout child, 1001bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, 1002bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes int heightUsed) { 1003bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes final CoordinatorLayout.LayoutParams lp = 1004bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes (CoordinatorLayout.LayoutParams) child.getLayoutParams(); 1005bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes if (lp.height == CoordinatorLayout.LayoutParams.WRAP_CONTENT) { 1006bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // If the view is set to wrap on it's height, CoordinatorLayout by default will 1007bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // cap the view at the CoL's height. Since the AppBarLayout can scroll, this isn't 1008bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // what we actually want, so we measure it ourselves with an unspecified spec to 1009bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // allow the child to be larger than it's parent 1010bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes parent.onMeasureChild(child, parentWidthMeasureSpec, widthUsed, 1011bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), heightUsed); 1012bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes return true; 1013bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes } 1014bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes 1015bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // Let the parent handle it as normal 1016bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes return super.onMeasureChild(parent, child, parentWidthMeasureSpec, widthUsed, 1017bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes parentHeightMeasureSpec, heightUsed); 1018bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes } 1019bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes 1020bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes @Override 10219995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public boolean onLayoutChild(CoordinatorLayout parent, AppBarLayout abl, 102250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int layoutDirection) { 10239995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes boolean handled = super.onLayoutChild(parent, abl, layoutDirection); 10249995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 10259995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int pendingAction = abl.getPendingAction(); 10269995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (pendingAction != PENDING_ACTION_NONE) { 10279995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final boolean animate = (pendingAction & PENDING_ACTION_ANIMATE_ENABLED) != 0; 10289995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if ((pendingAction & PENDING_ACTION_COLLAPSED) != 0) { 10299995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int offset = -abl.getUpNestedPreScrollRange(); 10309995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 103157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(parent, abl, offset, 0); 10329995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 1033ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, offset); 10349995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10359995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if ((pendingAction & PENDING_ACTION_EXPANDED) != 0) { 10369995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 103757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(parent, abl, 0, 0); 10389995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 1039ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, 0); 10409995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10419995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10429995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if (mOffsetToChildIndexOnLayout >= 0) { 10439995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes View child = abl.getChildAt(mOffsetToChildIndexOnLayout); 1044e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int offset = -child.getBottom(); 1045e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (mOffsetToChildIndexOnLayoutIsMinHeight) { 1046e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes offset += ViewCompat.getMinimumHeight(child); 1047e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 1048e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes offset += Math.round(child.getHeight() * mOffsetToChildIndexOnLayoutPerc); 1049e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1050e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes setTopAndBottomOffset(offset); 1051e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 105250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 105379aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes // Finally reset any pending states 105479aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes abl.resetPendingAction(); 105579aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 105679aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes 105747543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // We may have changed size, so let's constrain the top and bottom offset correctly, 105847543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // just in case we're out of the bounds 105947543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes setTopAndBottomOffset( 106047543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes MathUtils.constrain(getTopAndBottomOffset(), -abl.getTotalScrollRange(), 0)); 106147543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes 10621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Make sure we dispatch the offset update 10631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes abl.dispatchOffsetUpdates(getTopAndBottomOffset()); 106450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 106550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return handled; 1066a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1067a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 106872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 106972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes boolean canDragView(AppBarLayout view) { 107072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes if (mOnDragCallback != null) { 107172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // If there is a drag callback set, it's in control 107272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return mOnDragCallback.canDrag(view); 107372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 107472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 107572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // Else we'll use the default behaviour of seeing if it can scroll down 1076d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mLastNestedScrollingChildRef != null) { 107772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // If we have a reference to a scrolling view, check it 107872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes final View scrollingView = mLastNestedScrollingChildRef.get(); 107972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return scrollingView != null && scrollingView.isShown() 108072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes && !ViewCompat.canScrollVertically(scrollingView, -1); 108172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } else { 108272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // Otherwise we assume that the scrolling view hasn't been scrolled and can drag. 108372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return true; 1084d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1085d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1086d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 1087ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 108847543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes void onFlingFinished(CoordinatorLayout parent, AppBarLayout layout) { 108947543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // At the end of a manual fling, check to see if we need to snap to the edge-child 109047543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes snapToChildIfNeeded(parent, layout); 109147543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes } 109247543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes 109347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes @Override 109472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getMaxDragOffset(AppBarLayout view) { 109572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return -view.getDownNestedScrollRange(); 109672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 109772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 109872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 109972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getScrollRangeForDragFling(AppBarLayout view) { 110072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return view.getTotalScrollRange(); 110172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 110272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 110372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 110472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int setHeaderTopBottomOffset(CoordinatorLayout coordinatorLayout, 110572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes AppBarLayout header, int newOffset, int minOffset, int maxOffset) { 1106e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int curOffset = getTopBottomOffsetForScrollingSibling(); 1107a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int consumed = 0; 1108a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 11095e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes if (minOffset != 0 && curOffset >= minOffset && curOffset <= maxOffset) { 1110631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we have some scrolling range, and we're currently within the min and max 1111631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // offsets, calculate a new offset 111250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes newOffset = MathUtils.constrain(newOffset, minOffset, maxOffset); 1113ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor AppBarLayout appBarLayout = (AppBarLayout) header; 1114a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (curOffset != newOffset) { 1115e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int interpolatedOffset = appBarLayout.hasChildWithInterpolator() 1116e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ? interpolateOffset(appBarLayout, newOffset) 1117e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes : newOffset; 1118e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 11191a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final boolean offsetChanged = setTopAndBottomOffset(interpolatedOffset); 1120631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 1121a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update how much dy we have consumed 1122a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes consumed = curOffset - newOffset; 1123a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update the stored sibling offset 1124e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetDelta = newOffset - interpolatedOffset; 1125a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1126a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (!offsetChanged && appBarLayout.hasChildWithInterpolator()) { 1127a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If the offset hasn't changed and we're using an interpolated scroll 1128a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // then we need to keep any dependent views updated. CoL will do this for 1129a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us when we move, but we need to do it manually when we don't (as an 1130a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // interpolated scroll may finish early). 1131a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes coordinatorLayout.dispatchDependentViewsChanged(appBarLayout); 1132a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1133a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1134631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Dispatch the updates to any listeners 11351a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes appBarLayout.dispatchOffsetUpdates(getTopAndBottomOffset()); 11361a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 11371a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Update the AppBarLayout's drawable state (for any elevation changes) 11381a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes updateAppBarLayoutDrawableState(appBarLayout, newOffset, 11391a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes newOffset < curOffset ? -1 : 1); 1140a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 11415e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes } else { 11425e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // Reset the offset delta 11435e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes mOffsetDelta = 0; 1144a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1145a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1146a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return consumed; 1147a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1148a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1149a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int interpolateOffset(AppBarLayout layout, final int offset) { 1150a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int absOffset = Math.abs(offset); 1151a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1152a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 1153a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = layout.getChildAt(i); 1154a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 115550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 1156a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 115750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 1158a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 115950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int childScrollableHeight = 0; 116050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int flags = childLp.getScrollFlags(); 116150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 1162b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // We're set to scroll so add the child's height plus margin 1163b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childScrollableHeight += child.getHeight() + childLp.topMargin 1164b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes + childLp.bottomMargin; 1165b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes 116650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 1167b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // For a collapsing scroll, we to take the collapsed height 1168b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // into account. 116950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes childScrollableHeight -= ViewCompat.getMinimumHeight(child); 117050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 117150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 117250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1173ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (ViewCompat.getFitsSystemWindows(child)) { 1174ea004a01f44aaf36212120c936952c1742d03d30Chris Banes childScrollableHeight -= layout.getTopInset(); 1175ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1176ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 117750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (childScrollableHeight > 0) { 117850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int offsetForView = absOffset - child.getTop(); 117950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int interpolatedDiff = Math.round(childScrollableHeight * 118050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes interpolator.getInterpolation( 118150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes offsetForView / (float) childScrollableHeight)); 118250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 118350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return Integer.signum(offset) * (child.getTop() + interpolatedDiff); 118450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 1185a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 118650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 118750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If we get to here then the view on the offset isn't suitable for interpolated 118850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // scrolling. So break out of the loop 118950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes break; 1190a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1191a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1192a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1193a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return offset; 1194a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1195a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 11961a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private void updateAppBarLayoutDrawableState(final AppBarLayout layout, 11971a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int offset, final int direction) { 11981a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final View child = getAppBarChildOnOffset(layout, offset); 11991a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (child != null) { 12001a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 12011a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int flags = childLp.getScrollFlags(); 12021a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes boolean collapsed = false; 12031a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12041a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 12051a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int minHeight = ViewCompat.getMinimumHeight(child); 12061a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12071a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (direction > 0 && (flags & (LayoutParams.SCROLL_FLAG_ENTER_ALWAYS 12081a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes | LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED)) != 0) { 12091a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // We're set to enter always collapsed so we are only collapsed when 12101a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // being scrolled down, and in a collapsed offset 12111a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes collapsed = -offset >= child.getBottom() - minHeight - layout.getTopInset(); 12121a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 12131a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // We're set to exit until collapsed, so any offset which results in 12141a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // the minimum height (or less) being shown is collapsed 12151a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes collapsed = -offset >= child.getBottom() - minHeight - layout.getTopInset(); 12161a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12171a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12181a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 121957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes layout.setCollapsedState(collapsed); 12201a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12211a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12221a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12231a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private static View getAppBarChildOnOffset(final AppBarLayout layout, final int offset) { 12241a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int absOffset = Math.abs(offset); 12251a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 12261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final View child = layout.getChildAt(i); 12271a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 12281a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return child; 12291a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12311a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return null; 12321a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12331a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1234ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 123572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getTopBottomOffsetForScrollingSibling() { 1236e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return getTopAndBottomOffset() + mOffsetDelta; 1237e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1238e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1239e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1240e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public Parcelable onSaveInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout) { 1241e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final Parcelable superState = super.onSaveInstanceState(parent, appBarLayout); 1242e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int offset = getTopAndBottomOffset(); 1243e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1244e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Try and find the first visible child... 1245e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes for (int i = 0, count = appBarLayout.getChildCount(); i < count; i++) { 1246e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes View child = appBarLayout.getChildAt(i); 1247e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int visBottom = child.getBottom() + offset; 1248e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1249e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (child.getTop() + offset <= 0 && visBottom >= 0) { 1250e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = new SavedState(superState); 1251e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibleChildIndex = i; 1252c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas ss.firstVisibleChildAtMinimumHeight = 1253e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes visBottom == ViewCompat.getMinimumHeight(child); 1254c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas ss.firstVisibleChildPercentageShown = visBottom / (float) child.getHeight(); 1255e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return ss; 1256e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1257e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1258e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1259e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Else we'll just return the super state 1260e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return superState; 1261e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1262e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1263e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1264e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void onRestoreInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout, 1265e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes Parcelable state) { 1266e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (state instanceof SavedState) { 1267e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = (SavedState) state; 1268e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, ss.getSuperState()); 1269e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = ss.firstVisibleChildIndex; 1270c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas mOffsetToChildIndexOnLayoutPerc = ss.firstVisibleChildPercentageShown; 1271c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas mOffsetToChildIndexOnLayoutIsMinHeight = ss.firstVisibleChildAtMinimumHeight; 1272e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 1273e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, state); 1274e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 1275e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1276e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1277e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 127805f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banes protected static class SavedState extends AbsSavedState { 1279e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int firstVisibleChildIndex; 1280c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas float firstVisibleChildPercentageShown; 1281c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas boolean firstVisibleChildAtMinimumHeight; 1282e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 128362ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes public SavedState(Parcel source, ClassLoader loader) { 128405f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banes super(source, loader); 1285e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibleChildIndex = source.readInt(); 1286c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas firstVisibleChildPercentageShown = source.readFloat(); 1287c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas firstVisibleChildAtMinimumHeight = source.readByte() != 0; 1288e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1289e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1290e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState(Parcelable superState) { 1291e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super(superState); 1292e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1293e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1294e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1295e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void writeToParcel(Parcel dest, int flags) { 1296e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.writeToParcel(dest, flags); 1297e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeInt(firstVisibleChildIndex); 1298c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas dest.writeFloat(firstVisibleChildPercentageShown); 1299c9a859537b0871f84afeeb706a5b425fe3f2b4ddAurimas Liutikas dest.writeByte((byte) (firstVisibleChildAtMinimumHeight ? 1 : 0)); 1300e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1301e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1302e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public static final Parcelable.Creator<SavedState> CREATOR = 130362ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes ParcelableCompat.newCreator(new ParcelableCompatCreatorCallbacks<SavedState>() { 1304e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 130562ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes public SavedState createFromParcel(Parcel source, ClassLoader loader) { 130662ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes return new SavedState(source, loader); 1307e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1308e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1309e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1310e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState[] newArray(int size) { 1311e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return new SavedState[size]; 1312e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 131362ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes }); 1314a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1315a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1316a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1317a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1318a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Behavior which should be used by {@link View}s which can scroll vertically and support 1319a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * nested scrolling to automatically scroll any {@link AppBarLayout} siblings. 1320a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1321ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class ScrollingViewBehavior extends HeaderScrollingViewBehavior { 1322a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1323a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior() {} 1324a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1325a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior(Context context, AttributeSet attrs) { 1326a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 1327a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1328b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final TypedArray a = context.obtainStyledAttributes(attrs, 132973e7a06fb66110495fa4e98a91831a47feab2526Chris Banes R.styleable.ScrollingViewBehavior_Layout); 1330b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes setOverlayTop(a.getDimensionPixelSize( 133173e7a06fb66110495fa4e98a91831a47feab2526Chris Banes R.styleable.ScrollingViewBehavior_Layout_behavior_overlapTop, 0)); 1332a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 1333a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1334a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1335a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1336a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) { 1337a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We depend on any AppBarLayouts 1338a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return dependency instanceof AppBarLayout; 1339a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1340a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1341a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1342a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean onDependentViewChanged(CoordinatorLayout parent, View child, 1343a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View dependency) { 13445e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes offsetChildAsNeeded(parent, child, dependency); 13450d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return false; 13460d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 13470d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 13485e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes private void offsetChildAsNeeded(CoordinatorLayout parent, View child, View dependency) { 1349a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final CoordinatorLayout.Behavior behavior = 1350a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes ((CoordinatorLayout.LayoutParams) dependency.getLayoutParams()).getBehavior(); 1351a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (behavior instanceof Behavior) { 13525e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // Offset the child, pinning it to the bottom the header-dependency, maintaining 13535e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // any vertical gap, and overlap 13545e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes final Behavior ablBehavior = (Behavior) behavior; 13555e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes final int offset = ablBehavior.getTopBottomOffsetForScrollingSibling(); 1356318baf84dade07174d71e10322e3b10ab4b0c28cChris Banes ViewCompat.offsetTopAndBottom(child, (dependency.getBottom() - child.getTop()) 13575e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes + ablBehavior.mOffsetDelta 13585e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes + getVerticalLayoutGap() 1359b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes - getOverlapPixelsForOffset(dependency)); 1360ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1361ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1362ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 1363b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes 1364b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes @Override 1365b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes float getOverlapRatioForOffset(final View header) { 1366b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes if (header instanceof AppBarLayout) { 1367b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final AppBarLayout abl = (AppBarLayout) header; 1368ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int totalScrollRange = abl.getTotalScrollRange(); 1369ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int preScrollDown = abl.getDownNestedPreScrollRange(); 1370b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final int offset = getAppBarLayoutOffset(abl); 1371a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1372ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (preScrollDown != 0 && (totalScrollRange + offset) <= preScrollDown) { 1373ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // If we're in a pre-scroll down. Don't use the offset at all. 1374ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return 0; 1375a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 1376ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int availScrollRange = totalScrollRange - preScrollDown; 1377dfb857dd12b359c0bdae11a23e039f286d54dc0aChris Banes if (availScrollRange != 0) { 1378ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Else we'll use a interpolated ratio of the overlap, depending on offset 1379b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 1f + (offset / (float) availScrollRange); 1380ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1381a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1382a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1383b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 0f; 1384a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1385a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1386b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes private static int getAppBarLayoutOffset(AppBarLayout abl) { 1387b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final CoordinatorLayout.Behavior behavior = 1388b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes ((CoordinatorLayout.LayoutParams) abl.getLayoutParams()).getBehavior(); 1389b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes if (behavior instanceof Behavior) { 1390b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return ((Behavior) behavior).getTopBottomOffsetForScrollingSibling(); 1391b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes } 1392b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 0; 1393a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1394a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1395ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 139672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes View findFirstDependency(List<View> views) { 1397a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = views.size(); i < z; i++) { 1398a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View view = views.get(i); 1399a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (view instanceof AppBarLayout) { 140072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return view; 1401a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1402a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1403a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return null; 1404a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1405ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor 1406ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 140772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getScrollRange(View v) { 1408ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor if (v instanceof AppBarLayout) { 1409ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return ((AppBarLayout) v).getTotalScrollRange(); 1410ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } else { 1411ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return super.getScrollRange(v); 1412ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1413ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1414a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1415a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes} 1416