AppBarLayout.java revision 13633353237d6506f4c436b459bc8be8c3d7ed68
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 46a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes/** 47a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * AppBarLayout is a vertical {@link LinearLayout} which implements many of the features of 489fb154338a62edc2c57dc036895199d6f1769400Chris Banes * material designs app bar concept, namely scrolling gestures. 49a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 50a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Children should provide their desired scrolling behavior through 51a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams#setScrollFlags(int)} and the associated layout xml attribute: 52a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@code app:layout_scrollFlags}. 53a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 54a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 55a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * This view depends heavily on being used as a direct child within a {@link CoordinatorLayout}. 56a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * If you use AppBarLayout within a different {@link ViewGroup}, most of it's functionality will 57a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * not work. 58a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <p> 599fb154338a62edc2c57dc036895199d6f1769400Chris Banes * AppBarLayout also requires a separate scrolling sibling in order to know when to scroll. 609fb154338a62edc2c57dc036895199d6f1769400Chris Banes * The binding is done through the {@link ScrollingViewBehavior} behavior class, meaning that you 619fb154338a62edc2c57dc036895199d6f1769400Chris Banes * should set your scrolling view's behavior to be an instance of {@link ScrollingViewBehavior}. 629fb154338a62edc2c57dc036895199d6f1769400Chris Banes * A string resource containing the full class name is available. 63a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 64a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <pre> 65a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.CoordinatorLayout 66a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:android="http://schemas.android.com/apk/res/android" 67a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * xmlns:app="http://schemas.android.com/apk/res-auto" 68a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 69a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent"> 70a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 71a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v4.widget.NestedScrollView 72a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent" 73a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="match_parent" 74a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_behavior="@string/appbar_scrolling_view_behavior"> 75a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 76a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <!-- Your scrolling content --> 77a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 78a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.v4.widget.NestedScrollView> 79a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 80a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.AppBarLayout 81a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_height="wrap_content" 82a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * android:layout_width="match_parent"> 83a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 84a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.v7.widget.Toolbar 85a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 86a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 87a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 88a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * <android.support.design.widget.TabLayout 89a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * ... 90a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * app:layout_scrollFlags="scroll|enterAlways"/> 91a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 92a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.AppBarLayout> 93a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 94a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </android.support.design.widget.CoordinatorLayout> 95a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * </pre> 96a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 97a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see <a href="http://www.google.com/design/spec/layout/structure.html#structure-app-bar"> 98a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * http://www.google.com/design/spec/layout/structure.html#structure-app-bar</a> 99a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 100a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes@CoordinatorLayout.DefaultBehavior(AppBarLayout.Behavior.class) 101a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banespublic class AppBarLayout extends LinearLayout { 102a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1039995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_NONE = 0x0; 1049995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_EXPANDED = 0x1; 1059995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_COLLAPSED = 0x2; 1069995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private static final int PENDING_ACTION_ANIMATE_ENABLED = 0x4; 1079995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 108a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 109631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Interface definition for a callback to be invoked when an {@link AppBarLayout}'s vertical 110631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * offset changes. 111a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 112631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public interface OnOffsetChangedListener { 113a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 114a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Called when the {@link AppBarLayout}'s layout offset has been changed. This allows 115a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * child views to implement custom behavior based on the offset (for instance pinning a 116a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * view at a certain y value). 117a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 118631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param appBarLayout the {@link AppBarLayout} which offset has changed 11950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes * @param verticalOffset the vertical offset for the parent {@link AppBarLayout}, in px 120a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 121631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset); 122a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 123a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 124a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private static final int INVALID_SCROLL_RANGE = -1; 125a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 126a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mTotalScrollRange = INVALID_SCROLL_RANGE; 127a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownPreScrollRange = INVALID_SCROLL_RANGE; 128a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int mDownScrollRange = INVALID_SCROLL_RANGE; 129a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mHaveChildWithInterpolator; 13150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1329995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes private int mPendingAction = PENDING_ACTION_NONE; 1339995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 1346ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes private WindowInsetsCompat mLastInsets; 1356ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 1361a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private List<OnOffsetChangedListener> mListeners; 1371a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1381a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mCollapsible; 1391a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean mCollapsed; 1401a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private final int[] mTmpStatesArray = new int[2]; 142631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 143a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context) { 144a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes this(context, null); 145a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 146a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 147a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public AppBarLayout(Context context, AttributeSet attrs) { 148a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 149a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes setOrientation(VERTICAL); 15050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 151809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes ThemeUtils.checkAppCompatTheme(context); 152809bb62055ad42b88f3a69308be222801b89fbd9Chris Banes 1531a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21) { 1541a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Use the bounds view outline provider so that we cast a shadow, even without a 1551a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // background 1561a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setBoundsViewOutlineProvider(this); 1571a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1581a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // If we're running on API 21+, we should reset any state list animator from our 1591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // default style 1601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setStateListAnimatorFromAttrs(this, attrs, 0, 1611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes R.style.Widget_Design_AppBarLayout); 1621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 1631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AppBarLayout, 16550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 0, R.style.Widget_Design_AppBarLayout); 16681520564f3dd783136e025174021ba4eabd6ff3cChris Banes setBackgroundDrawable(a.getDrawable(R.styleable.AppBarLayout_android_background)); 1679995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (a.hasValue(R.styleable.AppBarLayout_expanded)) { 1689995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(a.getBoolean(R.styleable.AppBarLayout_expanded, false)); 1699995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 1701a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21 && a.hasValue(R.styleable.AppBarLayout_elevation)) { 1711a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setDefaultAppBarLayoutStateListAnimator( 1721a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes this, a.getDimensionPixelSize(R.styleable.AppBarLayout_elevation, 0)); 1731a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 17450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes a.recycle(); 17550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1766ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes ViewCompat.setOnApplyWindowInsetsListener(this, 1776ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes new android.support.v4.view.OnApplyWindowInsetsListener() { 1786ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes @Override 1796ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public WindowInsetsCompat onApplyWindowInsets(View v, 1806ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes WindowInsetsCompat insets) { 1818818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes return onWindowInsetChanged(insets); 1826ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 1836ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes }); 184631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 185631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 186631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 187631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Add a listener that will be called when the offset of this {@link AppBarLayout} changes. 188631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 189631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener The listener that will be called when the offset changes.] 190631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 191631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @see #removeOnOffsetChangedListener(OnOffsetChangedListener) 192631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 193631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void addOnOffsetChangedListener(OnOffsetChangedListener listener) { 1941a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners == null) { 1951a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mListeners = new ArrayList<>(); 1961a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 1976f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes if (listener != null && !mListeners.contains(listener)) { 1986f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.add(listener); 199631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 200631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 201631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 202631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 203631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * Remove the previously added {@link OnOffsetChangedListener}. 204631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 205631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * @param listener the listener to remove. 206631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 207631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void removeOnOffsetChangedListener(OnOffsetChangedListener listener) { 2081a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners != null && listener != null) { 2096f730c0acfb10a929172ea2981a1aded0e39f5c7Chris Banes mListeners.remove(listener); 210631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 211a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 212a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 213a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 214ea004a01f44aaf36212120c936952c1742d03d30Chris Banes protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 215ea004a01f44aaf36212120c936952c1742d03d30Chris Banes super.onMeasure(widthMeasureSpec, heightMeasureSpec); 216ea004a01f44aaf36212120c936952c1742d03d30Chris Banes invalidateScrollRanges(); 217ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 218ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 219ea004a01f44aaf36212120c936952c1742d03d30Chris Banes @Override 220a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected void onLayout(boolean changed, int l, int t, int r, int b) { 221a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.onLayout(changed, l, t, r, b); 22279aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes invalidateScrollRanges(); 223a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 224a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = false; 225a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 226a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 227a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 228a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 229a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 230a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 231a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mHaveChildWithInterpolator = true; 232a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 233a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 234a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 2351a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 2361a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes updateCollapsible(); 2371a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2381a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 2391a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private void updateCollapsible() { 2401a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes boolean haveCollapsibleChild = false; 2411a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 2421a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (((LayoutParams) getChildAt(i).getLayoutParams()).isCollapsible()) { 2431a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes haveCollapsibleChild = true; 2441a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes break; 2451a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 2461a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 24757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes setCollapsibleState(haveCollapsibleChild); 248a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 249a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 250ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void invalidateScrollRanges() { 251ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Invalidate the scroll ranges 252ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mTotalScrollRange = INVALID_SCROLL_RANGE; 253ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownPreScrollRange = INVALID_SCROLL_RANGE; 254ea004a01f44aaf36212120c936952c1742d03d30Chris Banes mDownScrollRange = INVALID_SCROLL_RANGE; 255ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 256ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 257a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 258a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setOrientation(int orientation) { 259a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (orientation != VERTICAL) { 260a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes throw new IllegalArgumentException("AppBarLayout is always vertical and does" 261a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes + " not support horizontal orientation"); 262a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 263a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super.setOrientation(orientation); 264a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 265a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 2669995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2679995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not, animating if it has already 2689995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * been laid out. 2699995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2709995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2719995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2729995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2739995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2749995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2759995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2769995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2779995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2789995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded) { 2799995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes setExpanded(expanded, ViewCompat.isLaidOut(this)); 2809995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 2819995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 2829995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes /** 2839995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * Sets whether this {@link AppBarLayout} is expanded or not. 2849995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2859995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * <p>As with {@link AppBarLayout}'s scrolling, this method relies on this layout being a 2869995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * direct child of a {@link CoordinatorLayout}.</p> 2879995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2889995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param expanded true if the layout should be fully expanded, false if it should 2899995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * be fully collapsed 2909995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @param animate Whether to animate to the new state 2919995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * 2929995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_expanded 2939995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes */ 2949995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public void setExpanded(boolean expanded, boolean animate) { 2959995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = (expanded ? PENDING_ACTION_EXPANDED : PENDING_ACTION_COLLAPSED) 2969995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes | (animate ? PENDING_ACTION_ANIMATE_ENABLED : 0); 2979995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes requestLayout(); 2989995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 2999995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 300a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 301a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 302a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return p instanceof LayoutParams; 303a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 304a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 305a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 306a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateDefaultLayoutParams() { 307a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT); 308a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 309a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 310a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 311a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams generateLayoutParams(AttributeSet attrs) { 312a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(getContext(), attrs); 313a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 314a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 315a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 316a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 317a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (p instanceof LinearLayout.LayoutParams) { 318a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((LinearLayout.LayoutParams) p); 319a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (p instanceof MarginLayoutParams) { 320a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams((MarginLayoutParams) p); 321a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 322a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return new LayoutParams(p); 323a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 324a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 325ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private boolean hasChildWithInterpolator() { 326a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mHaveChildWithInterpolator; 327a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 328a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 329a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 3306ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes * Returns the scroll range of all children. 331a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 332a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @return the scroll range in px 333a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 3346ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes public final int getTotalScrollRange() { 335a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mTotalScrollRange != INVALID_SCROLL_RANGE) { 336a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mTotalScrollRange; 337a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 338a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 339a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 340a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 341a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 342a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 343ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 344a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 345a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 346a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 347a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 348b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += childHeight + lp.topMargin + lp.bottomMargin; 349a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 350a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 351a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing scroll, we to take the collapsed height into account. 3526ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes // We also break straight away since later views can't scroll beneath 353a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us 3546ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes range -= ViewCompat.getMinimumHeight(child); 3556ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes break; 356a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 357a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 358a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 359a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 360a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 361a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 362a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 3634832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes return mTotalScrollRange = Math.max(0, range - getTopInset()); 364a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 365a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 366ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private boolean hasScrollableChildren() { 367a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return getTotalScrollRange() != 0; 368a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 369a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 370a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 371a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling up from a nested pre-scroll. 372a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 373ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getUpNestedPreScrollRange() { 37450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return getTotalScrollRange(); 375a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 376a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 377a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 378a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested pre-scroll. 379a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 380ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getDownNestedPreScrollRange() { 381a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownPreScrollRange != INVALID_SCROLL_RANGE) { 382a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 383a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownPreScrollRange; 384a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 385a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 386a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 387a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = getChildCount() - 1; i >= 0; i--) { 388a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 389a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 390ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int childHeight = child.getMeasuredHeight(); 391a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 392a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 393a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.FLAG_QUICK_RETURN) == LayoutParams.FLAG_QUICK_RETURN) { 394b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // First take the margin into account 395b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes range += lp.topMargin + lp.bottomMargin; 396a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // The view has the quick return flag combination... 397a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED) != 0) { 398a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If they're set to enter collapsed, use the minimum height 399a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += ViewCompat.getMinimumHeight(child); 40047543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes } else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 40147543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // Only enter by the amount of the collapsed height 40247543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes range += childHeight - ViewCompat.getMinimumHeight(child); 403a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 404a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Else use the full height 405a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 406a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 407a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else if (range > 0) { 408a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we've hit an non-quick return scrollable view, and we've already hit a 409a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // quick return view, return now 410a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 411a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 412a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 41313633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes return mDownPreScrollRange = Math.max(0, range); 414a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 415a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 416a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 417a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Return the scroll range when scrolling down from a nested scroll. 418a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 419ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getDownNestedScrollRange() { 420a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (mDownScrollRange != INVALID_SCROLL_RANGE) { 421a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If we already have a valid value, return it 422a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mDownScrollRange; 423a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 424a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 425a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int range = 0; 426c1ce4f6cf4d99d6856c4259bf1bb1cb56f604737Chris Banes for (int i = 0, z = getChildCount(); i < z; i++) { 427a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = getChildAt(i); 428a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final LayoutParams lp = (LayoutParams) child.getLayoutParams(); 429ea004a01f44aaf36212120c936952c1742d03d30Chris Banes int childHeight = child.getMeasuredHeight(); 430b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childHeight += lp.topMargin + lp.bottomMargin; 431a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 432a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int flags = lp.mScrollFlags; 433a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 434a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 435a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We're set to scroll so add the child's height 436a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes range += childHeight; 437a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 438a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 439a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // For a collapsing exit scroll, we to take the collapsed height into account. 4404832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes // We also break the range straight away since later views can't scroll 441a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // beneath us 4424832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes range -= ViewCompat.getMinimumHeight(child) + getTopInset(); 4434832063daa6620f0ad51c4a16f31502dab1adc89Chris Banes break; 444a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 445a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 446a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // As soon as a view doesn't have the scroll flag, we end the range calculation. 447a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // This is because views below can not scroll under a fixed view. 448a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes break; 449a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 450a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 4514c33be829067714342b629d29329206bc2116afeChris Banes return mDownScrollRange = Math.max(0, range); 452a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 453a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 4541a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private void dispatchOffsetUpdates(int offset) { 4551a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Iterate backwards through the list so that most recently added listeners 4561a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // get the first chance to decide 4571a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mListeners != null) { 4581a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = mListeners.size(); i < z; i++) { 4591a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final OnOffsetChangedListener listener = mListeners.get(i); 4601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (listener != null) { 4611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes listener.onOffsetChanged(this, offset); 4621a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4631a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4641a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4651a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4661a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 46750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int getMinimumHeightForVisibleOverlappingContent() { 46817ed3263761329f6aa6796941358c41001fff325Chris Banes final int topInset = getTopInset(); 46950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int minHeight = ViewCompat.getMinimumHeight(this); 47050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (minHeight != 0) { 47150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If this layout has a min height, use it (doubled) 4726ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes return (minHeight * 2) + topInset; 47350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 47450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 47550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Otherwise, we'll use twice the min height of our last child 47650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int childCount = getChildCount(); 477b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes final int lastChildMinHeight = childCount >= 1 478b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes ? ViewCompat.getMinimumHeight(getChildAt(childCount - 1)) : 0; 479b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes if (lastChildMinHeight != 0) { 480b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes return (lastChildMinHeight * 2) + topInset; 481b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes } 482b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes 483b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes // If we reach here then we don't have a min height explicitly set. Instead we'll take a 484b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes // guess at 1/3 of our height being visible 485b75a16fb6433ab27973d419d23ed1286c073fca8Chris Banes return getHeight() / 3; 48650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 48750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 4881a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Override 4891a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes protected int[] onCreateDrawableState(int extraSpace) { 4901a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int[] extraStates = mTmpStatesArray; 4911a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int[] states = super.onCreateDrawableState(extraSpace + extraStates.length); 4921a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 4931a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes extraStates[0] = mCollapsible ? R.attr.state_collapsible : -R.attr.state_collapsible; 4941a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes extraStates[1] = mCollapsible && mCollapsed 4951a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ? R.attr.state_collapsed : -R.attr.state_collapsed; 4961a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 4971a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return mergeDrawableStates(states, extraStates); 4981a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 4991a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 50057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private void setCollapsibleState(boolean collapsible) { 5011a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mCollapsible != collapsible) { 5021a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mCollapsible = collapsible; 5031a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes refreshDrawableState(); 5041a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5051a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5061a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 50757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private void setCollapsedState(boolean collapsed) { 5081a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (mCollapsed != collapsed) { 5091a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes mCollapsed = collapsed; 5101a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes refreshDrawableState(); 5111a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5121a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 5131a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 51450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** 5151a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @deprecated target elevation is now deprecated. AppBarLayout's elevation is now 516926cd28257536b1206934d69585a2dab100147d5Chris Banes * controlled via a {@link android.animation.StateListAnimator}. If a target 517926cd28257536b1206934d69585a2dab100147d5Chris Banes * elevation is set, either by this method or the {@code app:elevation} attibute, 518926cd28257536b1206934d69585a2dab100147d5Chris Banes * a new state list animator is created which uses the given {@code elevation} value. 519631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes * 5201a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_elevation 52150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes */ 5221a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Deprecated 523631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void setTargetElevation(float elevation) { 5241a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (Build.VERSION.SDK_INT >= 21) { 5251a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes ViewUtilsLollipop.setDefaultAppBarLayoutStateListAnimator(this, elevation); 5261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 527631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 528631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 529631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes /** 5301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * @deprecated target elevation is now deprecated. AppBarLayout's elevation is now 531926cd28257536b1206934d69585a2dab100147d5Chris Banes * controlled via a {@link android.animation.StateListAnimator}. This method now 532926cd28257536b1206934d69585a2dab100147d5Chris Banes * always returns 0. 533631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes */ 5341a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes @Deprecated 535631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public float getTargetElevation() { 5361a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return 0; 53750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 53850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 539ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private int getPendingAction() { 5409995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes return mPendingAction; 5419995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 5429995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 543ea004a01f44aaf36212120c936952c1742d03d30Chris Banes private void resetPendingAction() { 5449995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes mPendingAction = PENDING_ACTION_NONE; 5459995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 5469995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 54713633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes @VisibleForTesting 54813633353237d6506f4c436b459bc8be8c3d7ed68Chris Banes final int getTopInset() { 549ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return mLastInsets != null ? mLastInsets.getSystemWindowInsetTop() : 0; 550ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 551ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 5528818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes private WindowInsetsCompat onWindowInsetChanged(final WindowInsetsCompat insets) { 5538818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes WindowInsetsCompat newInsets = null; 5548818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 5558818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes if (ViewCompat.getFitsSystemWindows(this)) { 5568818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes // If we're set to fit system windows, keep the insets 5578818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes newInsets = insets; 5588818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes } 5598818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 5608818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes // If our insets have changed, keep them and invalidate the scroll ranges... 5618818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes if (newInsets != mLastInsets) { 5628818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes mLastInsets = newInsets; 5638818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes invalidateScrollRanges(); 5648818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes } 5658818e8e12682e5df1535cd9b2d792494bd3e059dChris Banes 56617ed3263761329f6aa6796941358c41001fff325Chris Banes return insets; 5676ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes } 5686ba61c5c79fe025036593c9daf79cb65299bb0b6Chris Banes 569a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static class LayoutParams extends LinearLayout.LayoutParams { 57050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 57150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes /** @hide */ 57250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @IntDef(flag=true, value={ 57350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_SCROLL, 57450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_EXIT_UNTIL_COLLAPSED, 57550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes SCROLL_FLAG_ENTER_ALWAYS, 576bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED, 577bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes SCROLL_FLAG_SNAP 57850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes }) 57950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Retention(RetentionPolicy.SOURCE) 58050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public @interface ScrollFlags {} 58150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 582a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 583a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The view will be scroll in direct relation to scroll events. This flag needs to be 584a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * set for any of the other flags to take effect. If any sibling views 585a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * before this one do not have this flag, then this value has no effect. 586a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 587a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_SCROLL = 0x1; 588a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 589a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 590a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When exiting (scrolling off screen) the view will be scrolled until it is 591a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 'collapsed'. The collapsed height is defined by the view's minimum height. 592a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 593a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 594a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 595a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 596a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_EXIT_UNTIL_COLLAPSED = 0x2; 597a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 598a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 599a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * When entering (scrolling on screen) the view will scroll on any downwards 600a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll event, regardless of whether the scrolling view is also scrolling. This 601a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * is commonly referred to as the 'quick return' pattern. 602a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 603a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS = 0x4; 604a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 605a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 606a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * An additional flag for 'enterAlways' which modifies the returning view to 607a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * only initially scroll back to it's collapsed height. Once the scrolling view has 608a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * reached the end of it's scroll range, the remainder of this view will be scrolled 609a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * into view. The collapsed height is defined by the view's minimum height. 610a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 611a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see ViewCompat#getMinimumHeight(View) 612a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see View#setMinimumHeight(int) 613a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 614a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public static final int SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED = 0x8; 615a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 616a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 617bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Upon a scroll ending, if the view is only partially visible then it will be snapped 618bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * and scrolled to it's closest edge. For example, if the view only has it's bottom 25% 619bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * displayed, it will be scrolled off screen completely. Conversely, if it's bottom 75% 620bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * is visible then it will be scrolled fully into view. 621bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes */ 622bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public static final int SCROLL_FLAG_SNAP = 0x10; 623bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 624bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes /** 625bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * Internal flags which allows quick checking features 626a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 627a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes static final int FLAG_QUICK_RETURN = SCROLL_FLAG_SCROLL | SCROLL_FLAG_ENTER_ALWAYS; 628bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes static final int FLAG_SNAP = SCROLL_FLAG_SCROLL | SCROLL_FLAG_SNAP; 6291a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes static final int COLLAPSIBLE_FLAGS = SCROLL_FLAG_EXIT_UNTIL_COLLAPSED 6301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes | SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED; 631a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 632a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int mScrollFlags = SCROLL_FLAG_SCROLL; 633a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes Interpolator mScrollInterpolator; 634a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 635a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(Context c, AttributeSet attrs) { 636a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(c, attrs); 637c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.AppBarLayout_Layout); 638c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes mScrollFlags = a.getInt(R.styleable.AppBarLayout_Layout_layout_scrollFlags, 0); 639c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes if (a.hasValue(R.styleable.AppBarLayout_Layout_layout_scrollInterpolator)) { 640a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int resId = a.getResourceId( 641c6cbbb50a06ec08e6888bd1c3dfd7fdf588d9db5Chris Banes R.styleable.AppBarLayout_Layout_layout_scrollInterpolator, 0); 642a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = android.view.animation.AnimationUtils.loadInterpolator( 643a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes c, resId); 644a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 645a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 646a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 647a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 648a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height) { 649a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height); 650a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 651a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 652a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(int width, int height, float weight) { 653a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(width, height, weight); 654a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 655a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 656a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(ViewGroup.LayoutParams p) { 657a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(p); 658a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 659a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 660a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(MarginLayoutParams source) { 661a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 662a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 663a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 664a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LinearLayout.LayoutParams source) { 665a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 666a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 667a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 668a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public LayoutParams(LayoutParams source) { 669a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(source); 670a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = source.mScrollFlags; 671a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = source.mScrollInterpolator; 672a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 673a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 674a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 675a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the scrolling flags. 676a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 677a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param flags bitwise int of {@link #SCROLL_FLAG_SCROLL}, 678bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_EXIT_UNTIL_COLLAPSED}, {@link #SCROLL_FLAG_ENTER_ALWAYS}, 679bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes * {@link #SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED} and {@link #SCROLL_FLAG_SNAP }. 680a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 681a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollFlags() 682a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 68373e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollFlags 684a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 68550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes public void setScrollFlags(@ScrollFlags int flags) { 686a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollFlags = flags; 687a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 688a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 689a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 690a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the scrolling flags. 691a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 692a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollFlags(int) 693a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 69473e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollFlags 695a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 69650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @ScrollFlags 697a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public int getScrollFlags() { 698a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollFlags; 699a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 700a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 701a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 702a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Set the interpolator to when scrolling the view associated with this 703a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. 704a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 705a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @param interpolator the interpolator to use, or null to use normal 1-to-1 scrolling. 706a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 70773e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollInterpolator 708a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #getScrollInterpolator() 709a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 710a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void setScrollInterpolator(Interpolator interpolator) { 711a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes mScrollInterpolator = interpolator; 712a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 713a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 714a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 715a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Returns the {@link Interpolator} being used for scrolling the view associated with this 716a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * {@link LayoutParams}. Null indicates 'normal' 1-to-1 scrolling. 717a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * 71873e7a06fb66110495fa4e98a91831a47feab2526Chris Banes * @attr ref android.support.design.R.styleable#AppBarLayout_Layout_layout_scrollInterpolator 719a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * @see #setScrollInterpolator(Interpolator) 720a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 721a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Interpolator getScrollInterpolator() { 722a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return mScrollInterpolator; 723a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 7241a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 7251a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes /** 7261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes * Returns true if the scroll flags are compatible for 'collapsing' 7271a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes */ 7281a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private boolean isCollapsible() { 7291a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return (mScrollFlags & SCROLL_FLAG_SCROLL) == SCROLL_FLAG_SCROLL 7301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes && (mScrollFlags & COLLAPSIBLE_FLAGS) != 0; 7311a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 732a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 733a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 734a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 735a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * The default {@link Behavior} for {@link AppBarLayout}. Implements the necessary nested 736a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * scroll handling with offsetting. 737a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 738ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class Behavior extends HeaderBehavior<AppBarLayout> { 73957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private static final int MAX_OFFSET_ANIMATION_DURATION = 600; // ms 740e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private static final int INVALID_POSITION = -1; 741e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 74272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 74372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Callback to allow control over any {@link AppBarLayout} dragging. 74472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 74572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public static abstract class DragCallback { 74672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 74772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Allows control over whether the given {@link AppBarLayout} can be dragged or not. 74872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 74972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * <p>Dragging is defined as a direct touch on the AppBarLayout with movement. This 75072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * call does not affect any nested scrolling.</p> 75172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 75272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * @return true if we are in a position to scroll the AppBarLayout via a drag, false 75372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * if not. 75472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 75572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public abstract boolean canDrag(@NonNull AppBarLayout appBarLayout); 75672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 75772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 758e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetDelta; 759a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 76050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes private boolean mSkipNestedPreScroll; 76147543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes private boolean mWasNestedFlung; 762631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 763c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov private ValueAnimatorCompat mOffsetAnimator; 76450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 765e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private int mOffsetToChildIndexOnLayout = INVALID_POSITION; 766e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private boolean mOffsetToChildIndexOnLayoutIsMinHeight; 767e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes private float mOffsetToChildIndexOnLayoutPerc; 768e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 769d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes private WeakReference<View> mLastNestedScrollingChildRef; 77072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes private DragCallback mOnDragCallback; 771d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 772a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior() {} 773a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 774a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public Behavior(Context context, AttributeSet attrs) { 775a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 776a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 777a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 778a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 779ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes public boolean onStartNestedScroll(CoordinatorLayout parent, AppBarLayout child, 780a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View directTargetChild, View target, int nestedScrollAxes) { 781f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // Return true if we're nested scrolling vertically, and we have scrollable children 782f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes // and the scrolling view is big enough to scroll 783631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final boolean started = (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0 784f57cd2fd5059c43d77bdfec57edfd5a217533103Chris Banes && child.hasScrollableChildren() 785ab809dd75ef2f73b312038f2c10473cfa5885a58Chris Banes && parent.getHeight() - directTargetChild.getHeight() <= child.getHeight(); 786631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 787c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (started && mOffsetAnimator != null) { 788631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Cancel any offset animation 789c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 790631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 791631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 792d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // A new nested scroll has started so clear out the previous ref 793d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = null; 794d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 795631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes return started; 796a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 797a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 798a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 799a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 800a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dx, int dy, int[] consumed) { 80150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy != 0 && !mSkipNestedPreScroll) { 80250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int min, max; 80350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dy < 0) { 80450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling down 80550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getTotalScrollRange(); 80650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = min + child.getDownNestedPreScrollRange(); 80750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 80850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // We're scrolling up 80950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes min = -child.getUpNestedPreScrollRange(); 81050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes max = 0; 81150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 81250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes consumed[1] = scroll(coordinatorLayout, child, dy, min, max); 813a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 814a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 815a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 816a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 817a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public void onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, 818a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View target, int dxConsumed, int dyConsumed, 819a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int dxUnconsumed, int dyUnconsumed) { 82050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (dyUnconsumed < 0) { 82150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If the scrolling view is scrolling down but not consuming, it's probably be at 82250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // the top of it's content 82350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes scroll(coordinatorLayout, child, dyUnconsumed, 82450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes -child.getDownNestedScrollRange(), 0); 82550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // Set the expanding flag so that onNestedPreScroll doesn't handle any events 82650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = true; 82750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } else { 82850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // As we're no longer handling nested scrolls, reset the skip flag 82950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 830a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 83150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 832a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 83350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes @Override 834bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout abl, 83550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes View target) { 83647543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes if (!mWasNestedFlung) { 837bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we haven't been flung then let's see if the current view has been set to snap 838bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes snapToChildIfNeeded(coordinatorLayout, abl); 839bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 840bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 841bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // Reset the flags 84250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes mSkipNestedPreScroll = false; 84347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes mWasNestedFlung = false; 844d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes // Keep a reference to the previous nested scrolling child 845d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes mLastNestedScrollingChildRef = new WeakReference<>(target); 846d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 847d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 848d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes @Override 849631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public boolean onNestedFling(final CoordinatorLayout coordinatorLayout, 850631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes final AppBarLayout child, View target, float velocityX, float velocityY, 851631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes boolean consumed) { 852bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes boolean flung = false; 853bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 854631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (!consumed) { 855631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // It has been consumed so let's fling ourselves 856bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = fling(coordinatorLayout, child, -child.getTotalScrollRange(), 857bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 0, -velocityY); 858631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 859631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we're scrolling up and the child also consumed the fling. We'll fake scroll 860631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // upto our 'collapsed' offset 861631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes if (velocityY < 0) { 862631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling down 863bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int targetScroll = -child.getTotalScrollRange() 864631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes + child.getDownNestedPreScrollRange(); 865bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (getTopBottomOffsetForScrollingSibling() < targetScroll) { 866bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we're currently not expanded more than the target scroll, we'll 867bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // animate a fling 86857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll, velocityY); 869bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = true; 870631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 871631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 872631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // We're scrolling up 873bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int targetScroll = -child.getUpNestedPreScrollRange(); 874bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (getTopBottomOffsetForScrollingSibling() > targetScroll) { 875bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // If we're currently not expanded less than the target scroll, we'll 876bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // animate a fling 87757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(coordinatorLayout, child, targetScroll, velocityY); 878bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes flung = true; 879631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 880631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 881631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 882631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 88347543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes mWasNestedFlung = flung; 884bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes return flung; 885631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 886631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 88772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes /** 88872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * Set a callback to control any {@link AppBarLayout} dragging. 88972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * 89072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes * @param callback the callback to use, or {@code null} to use the default behavior. 89172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes */ 89272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes public void setDragCallback(@Nullable DragCallback callback) { 89372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes mOnDragCallback = callback; 89472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 89572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 896631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes private void animateOffsetTo(final CoordinatorLayout coordinatorLayout, 89757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final AppBarLayout child, final int offset, float velocity) { 89857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final int distance = Math.abs(getTopBottomOffsetForScrollingSibling() - offset); 89957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 90057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final int duration; 90157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes velocity = Math.abs(velocity); 90257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes if (velocity > 0) { 90357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes duration = 3 * Math.round(1000 * (distance / velocity)); 90457aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } else { 90557aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final float distanceRatio = (float) distance / child.getHeight(); 90657aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes duration = (int) ((distanceRatio + 1) * 150); 90757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } 90857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 90957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetWithDuration(coordinatorLayout, child, offset, duration); 91057aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes } 91157aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes 91257aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes private void animateOffsetWithDuration(final CoordinatorLayout coordinatorLayout, 91357aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes final AppBarLayout child, final int offset, final int duration) { 914dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes final int currentOffset = getTopBottomOffsetForScrollingSibling(); 915dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes if (currentOffset == offset) { 916c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (mOffsetAnimator != null && mOffsetAnimator.isRunning()) { 917c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 918dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 919dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes return; 920dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 921dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 922c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov if (mOffsetAnimator == null) { 923c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator = ViewUtils.createAnimator(); 924c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setInterpolator(AnimationUtils.DECELERATE_INTERPOLATOR); 925c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setUpdateListener(new ValueAnimatorCompat.AnimatorUpdateListener() { 926631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 927631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes public void onAnimationUpdate(ValueAnimatorCompat animator) { 928ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(coordinatorLayout, child, 929631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes animator.getAnimatedIntValue()); 930631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 931631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes }); 932631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } else { 933c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.cancel(); 934631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 935631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 93657aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes mOffsetAnimator.setDuration(Math.min(duration, MAX_OFFSET_ANIMATION_DURATION)); 937c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.setIntValues(currentOffset, offset); 938c530cc115fddab8e1d9645b322424dd45f9ecd0dKirill Grouchnikov mOffsetAnimator.start(); 939631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes } 940631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 941108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes private int getChildIndexOnOffset(AppBarLayout abl, final int offset) { 942bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes for (int i = 0, count = abl.getChildCount(); i < count; i++) { 943bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes View child = abl.getChildAt(i); 944bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes if (child.getTop() <= -offset && child.getBottom() >= -offset) { 945108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return i; 946bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 947bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 948108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return -1; 949bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 950bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 951bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes private void snapToChildIfNeeded(CoordinatorLayout coordinatorLayout, AppBarLayout abl) { 952bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final int offset = getTopBottomOffsetForScrollingSibling(); 953108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int offsetChildIndex = getChildIndexOnOffset(abl, offset); 954108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offsetChildIndex >= 0) { 955108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final View offsetChild = abl.getChildAt(offsetChildIndex); 956bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes final LayoutParams lp = (LayoutParams) offsetChild.getLayoutParams(); 957108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int flags = lp.getScrollFlags(); 958108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 959108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if ((flags & LayoutParams.FLAG_SNAP) == LayoutParams.FLAG_SNAP) { 960bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes // We're set the snap, so animate the offset to the nearest edge 961108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes int snapTop = -offsetChild.getTop(); 962108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes int snapBottom = -offsetChild.getBottom(); 963108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 964108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offsetChildIndex == abl.getChildCount() - 1) { 965108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If this is the last child, we need to take the top inset into account 966108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom += abl.getTopInset(); 967108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 968dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 969108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (checkFlag(flags, LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED)) { 970108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If the view is set only exit until it is collapsed, we'll abide by that 971108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom += ViewCompat.getMinimumHeight(offsetChild); 972108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } else if (checkFlag(flags, LayoutParams.FLAG_QUICK_RETURN 973108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes | LayoutParams.SCROLL_FLAG_ENTER_ALWAYS)) { 974108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // If it's set to always enter collapsed, it actually has two states. We 975108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes // select the state and then snap within the state 976108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int seam = snapBottom + ViewCompat.getMinimumHeight(offsetChild); 977108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes if (offset < seam) { 978108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapTop = seam; 979108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } else { 980108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes snapBottom = seam; 981108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 982dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes } 983dcde7bf0c79a12f30d3853a82f4fbf54ce5161c8Chris Banes 984108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes final int newOffset = offset < (snapBottom + snapTop) / 2 985108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes ? snapBottom 986108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes : snapTop; 987bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes animateOffsetTo(coordinatorLayout, abl, 98857aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes MathUtils.constrain(newOffset, -abl.getTotalScrollRange(), 0), 0); 989bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 990bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 991bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes } 992bc22c4fd37e99643b3e7b87e2849a9e63fb8c5fcChris Banes 993108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes private static boolean checkFlag(final int flags, final int check) { 994108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes return (flags & check) == check; 995108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes } 996108a7a812404313b7b9f8daa154e657e49e0aae6Chris Banes 997631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes @Override 998bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes public boolean onMeasureChild(CoordinatorLayout parent, AppBarLayout child, 999bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, 1000bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes int heightUsed) { 1001bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes final CoordinatorLayout.LayoutParams lp = 1002bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes (CoordinatorLayout.LayoutParams) child.getLayoutParams(); 1003bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes if (lp.height == CoordinatorLayout.LayoutParams.WRAP_CONTENT) { 1004bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // If the view is set to wrap on it's height, CoordinatorLayout by default will 1005bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // cap the view at the CoL's height. Since the AppBarLayout can scroll, this isn't 1006bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // what we actually want, so we measure it ourselves with an unspecified spec to 1007bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // allow the child to be larger than it's parent 1008bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes parent.onMeasureChild(child, parentWidthMeasureSpec, widthUsed, 1009bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), heightUsed); 1010bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes return true; 1011bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes } 1012bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes 1013bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes // Let the parent handle it as normal 1014bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes return super.onMeasureChild(parent, child, parentWidthMeasureSpec, widthUsed, 1015bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes parentHeightMeasureSpec, heightUsed); 1016bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes } 1017bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes 1018bca7a517ce4fb75e2571ce2d9d0263fea8e15dbeChris Banes @Override 10199995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes public boolean onLayoutChild(CoordinatorLayout parent, AppBarLayout abl, 102050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int layoutDirection) { 10219995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes boolean handled = super.onLayoutChild(parent, abl, layoutDirection); 10229995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes 10239995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int pendingAction = abl.getPendingAction(); 10249995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (pendingAction != PENDING_ACTION_NONE) { 10259995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final boolean animate = (pendingAction & PENDING_ACTION_ANIMATE_ENABLED) != 0; 10269995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if ((pendingAction & PENDING_ACTION_COLLAPSED) != 0) { 10279995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes final int offset = -abl.getUpNestedPreScrollRange(); 10289995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 102957aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(parent, abl, offset, 0); 10309995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 1031ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, offset); 10329995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10339995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if ((pendingAction & PENDING_ACTION_EXPANDED) != 0) { 10349995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes if (animate) { 103557aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes animateOffsetTo(parent, abl, 0, 0); 10369995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else { 1037ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor setHeaderTopBottomOffset(parent, abl, 0); 10389995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10399995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } 10409995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes } else if (mOffsetToChildIndexOnLayout >= 0) { 10419995f7bdb02dbe16155661545fd64046ad3d56c2Chris Banes View child = abl.getChildAt(mOffsetToChildIndexOnLayout); 1042e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int offset = -child.getBottom(); 1043e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (mOffsetToChildIndexOnLayoutIsMinHeight) { 1044e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes offset += ViewCompat.getMinimumHeight(child); 1045e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 1046e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes offset += Math.round(child.getHeight() * mOffsetToChildIndexOnLayoutPerc); 1047e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1048e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes setTopAndBottomOffset(offset); 1049e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 105050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 105179aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes // Finally reset any pending states 105279aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes abl.resetPendingAction(); 105379aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 105479aa418487cdefb85d3c1fac32d6403a1ac6057dChris Banes 105547543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // We may have changed size, so let's constrain the top and bottom offset correctly, 105647543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // just in case we're out of the bounds 105747543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes setTopAndBottomOffset( 105847543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes MathUtils.constrain(getTopAndBottomOffset(), -abl.getTotalScrollRange(), 0)); 105947543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes 10601a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Make sure we dispatch the offset update 10611a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes abl.dispatchOffsetUpdates(getTopAndBottomOffset()); 106250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 106350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return handled; 1064a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1065a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 106672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 106772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes boolean canDragView(AppBarLayout view) { 106872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes if (mOnDragCallback != null) { 106972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // If there is a drag callback set, it's in control 107072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return mOnDragCallback.canDrag(view); 107172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 107272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 107372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // Else we'll use the default behaviour of seeing if it can scroll down 1074d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes if (mLastNestedScrollingChildRef != null) { 107572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // If we have a reference to a scrolling view, check it 107672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes final View scrollingView = mLastNestedScrollingChildRef.get(); 107772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return scrollingView != null && scrollingView.isShown() 107872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes && !ViewCompat.canScrollVertically(scrollingView, -1); 107972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } else { 108072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes // Otherwise we assume that the scrolling view hasn't been scrolled and can drag. 108172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return true; 1082d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1083d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes } 1084d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes 1085ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 108647543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes void onFlingFinished(CoordinatorLayout parent, AppBarLayout layout) { 108747543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes // At the end of a manual fling, check to see if we need to snap to the edge-child 108847543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes snapToChildIfNeeded(parent, layout); 108947543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes } 109047543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes 109147543aa43aacb8defbbf90682fcb2b63ce1b00b5Chris Banes @Override 109272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getMaxDragOffset(AppBarLayout view) { 109372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return -view.getDownNestedScrollRange(); 109472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 109572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 109672a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 109772a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getScrollRangeForDragFling(AppBarLayout view) { 109872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return view.getTotalScrollRange(); 109972a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes } 110072a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes 110172a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes @Override 110272a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int setHeaderTopBottomOffset(CoordinatorLayout coordinatorLayout, 110372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes AppBarLayout header, int newOffset, int minOffset, int maxOffset) { 1104e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int curOffset = getTopBottomOffsetForScrollingSibling(); 1105a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes int consumed = 0; 1106a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 11075e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes if (minOffset != 0 && curOffset >= minOffset && curOffset <= maxOffset) { 1108631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // If we have some scrolling range, and we're currently within the min and max 1109631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // offsets, calculate a new offset 111050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes newOffset = MathUtils.constrain(newOffset, minOffset, maxOffset); 1111ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor AppBarLayout appBarLayout = (AppBarLayout) header; 1112a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (curOffset != newOffset) { 1113e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int interpolatedOffset = appBarLayout.hasChildWithInterpolator() 1114e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ? interpolateOffset(appBarLayout, newOffset) 1115e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes : newOffset; 1116e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 11171a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final boolean offsetChanged = setTopAndBottomOffset(interpolatedOffset); 1118631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes 1119a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update how much dy we have consumed 1120a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes consumed = curOffset - newOffset; 1121a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // Update the stored sibling offset 1122e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetDelta = newOffset - interpolatedOffset; 1123a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1124a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (!offsetChanged && appBarLayout.hasChildWithInterpolator()) { 1125a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // If the offset hasn't changed and we're using an interpolated scroll 1126a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // then we need to keep any dependent views updated. CoL will do this for 1127a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // us when we move, but we need to do it manually when we don't (as an 1128a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // interpolated scroll may finish early). 1129a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes coordinatorLayout.dispatchDependentViewsChanged(appBarLayout); 1130a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1131a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1132631f64ec9c6255f38a7f746d7949b6a537c1180fChris Banes // Dispatch the updates to any listeners 11331a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes appBarLayout.dispatchOffsetUpdates(getTopAndBottomOffset()); 11341a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 11351a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // Update the AppBarLayout's drawable state (for any elevation changes) 11361a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes updateAppBarLayoutDrawableState(appBarLayout, newOffset, 11371a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes newOffset < curOffset ? -1 : 1); 1138a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 11395e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes } else { 11405e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // Reset the offset delta 11415e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes mOffsetDelta = 0; 1142a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1143a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1144a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return consumed; 1145a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1146a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1147a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes private int interpolateOffset(AppBarLayout layout, final int offset) { 1148a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final int absOffset = Math.abs(offset); 1149a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1150a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 1151a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final View child = layout.getChildAt(i); 1152a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 115350dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final Interpolator interpolator = childLp.getScrollInterpolator(); 1154a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 115550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 1156a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (interpolator != null) { 115750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes int childScrollableHeight = 0; 115850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int flags = childLp.getScrollFlags(); 115950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 1160b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // We're set to scroll so add the child's height plus margin 1161b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes childScrollableHeight += child.getHeight() + childLp.topMargin 1162b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes + childLp.bottomMargin; 1163b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes 116450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 1165b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // For a collapsing scroll, we to take the collapsed height 1166b263b91ba75dc1a7855186e8b0e9cf75d46a6b8dChris Banes // into account. 116750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes childScrollableHeight -= ViewCompat.getMinimumHeight(child); 116850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 116950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 117050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 1171ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (ViewCompat.getFitsSystemWindows(child)) { 1172ea004a01f44aaf36212120c936952c1742d03d30Chris Banes childScrollableHeight -= layout.getTopInset(); 1173ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1174ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 117550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes if (childScrollableHeight > 0) { 117650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int offsetForView = absOffset - child.getTop(); 117750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes final int interpolatedDiff = Math.round(childScrollableHeight * 117850dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes interpolator.getInterpolation( 117950dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes offsetForView / (float) childScrollableHeight)); 118050dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 118150dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes return Integer.signum(offset) * (child.getTop() + interpolatedDiff); 118250dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes } 1183a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 118450dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes 118550dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // If we get to here then the view on the offset isn't suitable for interpolated 118650dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes // scrolling. So break out of the loop 118750dfc33a565c4aefe6d5e844c93aa24a74cb80b3Chris Banes break; 1188a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1189a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1190a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1191a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return offset; 1192a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1193a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 11941a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private void updateAppBarLayoutDrawableState(final AppBarLayout layout, 11951a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int offset, final int direction) { 11961a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final View child = getAppBarChildOnOffset(layout, offset); 11971a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (child != null) { 11981a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final AppBarLayout.LayoutParams childLp = (LayoutParams) child.getLayoutParams(); 11991a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int flags = childLp.getScrollFlags(); 12001a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes boolean collapsed = false; 12011a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12021a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if ((flags & LayoutParams.SCROLL_FLAG_SCROLL) != 0) { 12031a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int minHeight = ViewCompat.getMinimumHeight(child); 12041a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12051a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (direction > 0 && (flags & (LayoutParams.SCROLL_FLAG_ENTER_ALWAYS 12061a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes | LayoutParams.SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED)) != 0) { 12071a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // We're set to enter always collapsed so we are only collapsed when 12081a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // being scrolled down, and in a collapsed offset 12091a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes collapsed = -offset >= child.getBottom() - minHeight - layout.getTopInset(); 12101a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } else if ((flags & LayoutParams.SCROLL_FLAG_EXIT_UNTIL_COLLAPSED) != 0) { 12111a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // We're set to exit until collapsed, so any offset which results in 12121a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes // the minimum height (or less) being shown is collapsed 12131a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes collapsed = -offset >= child.getBottom() - minHeight - layout.getTopInset(); 12141a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12151a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12161a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 121757aa00c058f3278fccc7a23f3cef29142bb14dbbChris Banes layout.setCollapsedState(collapsed); 12181a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12191a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12201a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 12211a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes private static View getAppBarChildOnOffset(final AppBarLayout layout, final int offset) { 12221a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final int absOffset = Math.abs(offset); 12231a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes for (int i = 0, z = layout.getChildCount(); i < z; i++) { 12241a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes final View child = layout.getChildAt(i); 12251a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes if (absOffset >= child.getTop() && absOffset <= child.getBottom()) { 12261a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return child; 12271a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12281a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12291a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes return null; 12301a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes } 12311a8e4886abbc35e479cddb7b4acd601cede2fd8aChris Banes 1232ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 123372a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getTopBottomOffsetForScrollingSibling() { 1234e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return getTopAndBottomOffset() + mOffsetDelta; 1235e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1236e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1237e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1238e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public Parcelable onSaveInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout) { 1239e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final Parcelable superState = super.onSaveInstanceState(parent, appBarLayout); 1240e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int offset = getTopAndBottomOffset(); 1241e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1242e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Try and find the first visible child... 1243e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes for (int i = 0, count = appBarLayout.getChildCount(); i < count; i++) { 1244e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes View child = appBarLayout.getChildAt(i); 1245e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final int visBottom = child.getBottom() + offset; 1246e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1247e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (child.getTop() + offset <= 0 && visBottom >= 0) { 1248e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = new SavedState(superState); 1249e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibleChildIndex = i; 1250e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibileChildAtMinimumHeight = 1251e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes visBottom == ViewCompat.getMinimumHeight(child); 1252e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes ss.firstVisibileChildPercentageShown = visBottom / (float) child.getHeight(); 1253e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return ss; 1254e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1255e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1256e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1257e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes // Else we'll just return the super state 1258e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return superState; 1259e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1260e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1261e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1262e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void onRestoreInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout, 1263e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes Parcelable state) { 1264e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes if (state instanceof SavedState) { 1265e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes final SavedState ss = (SavedState) state; 1266e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, ss.getSuperState()); 1267e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = ss.firstVisibleChildIndex; 1268e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayoutPerc = ss.firstVisibileChildPercentageShown; 1269e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayoutIsMinHeight = ss.firstVisibileChildAtMinimumHeight; 1270e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } else { 1271e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.onRestoreInstanceState(parent, appBarLayout, state); 1272e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes mOffsetToChildIndexOnLayout = INVALID_POSITION; 1273e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1274e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1275e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 127605f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banes protected static class SavedState extends AbsSavedState { 1277e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes int firstVisibleChildIndex; 1278e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes float firstVisibileChildPercentageShown; 1279e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes boolean firstVisibileChildAtMinimumHeight; 1280e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 128162ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes public SavedState(Parcel source, ClassLoader loader) { 128205f5ba020fa6caa658c75b6d77436aa980ca0fccChris Banes super(source, loader); 1283e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibleChildIndex = source.readInt(); 1284e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibileChildPercentageShown = source.readFloat(); 1285e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes firstVisibileChildAtMinimumHeight = source.readByte() != 0; 1286e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1287e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1288e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState(Parcelable superState) { 1289e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super(superState); 1290e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1291e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1292e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1293e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public void writeToParcel(Parcel dest, int flags) { 1294e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes super.writeToParcel(dest, flags); 1295e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeInt(firstVisibleChildIndex); 1296e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeFloat(firstVisibileChildPercentageShown); 1297e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes dest.writeByte((byte) (firstVisibileChildAtMinimumHeight ? 1 : 0)); 1298e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1299e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1300e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public static final Parcelable.Creator<SavedState> CREATOR = 130162ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes ParcelableCompat.newCreator(new ParcelableCompatCreatorCallbacks<SavedState>() { 1302e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 130362ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes public SavedState createFromParcel(Parcel source, ClassLoader loader) { 130462ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes return new SavedState(source, loader); 1305e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 1306e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes 1307e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes @Override 1308e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes public SavedState[] newArray(int size) { 1309e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes return new SavedState[size]; 1310e52e16988e2500e20052ddd70920f950f4eb4f79Chris Banes } 131162ab25d71ccfa775a8bd2add7b41277bc4e14bbcChris Banes }); 1312a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1313a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1314a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1315a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes /** 1316a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * Behavior which should be used by {@link View}s which can scroll vertically and support 1317a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes * nested scrolling to automatically scroll any {@link AppBarLayout} siblings. 1318a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes */ 1319ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor public static class ScrollingViewBehavior extends HeaderScrollingViewBehavior { 1320a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1321a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior() {} 1322a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1323a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public ScrollingViewBehavior(Context context, AttributeSet attrs) { 1324a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes super(context, attrs); 1325a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1326b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final TypedArray a = context.obtainStyledAttributes(attrs, 132773e7a06fb66110495fa4e98a91831a47feab2526Chris Banes R.styleable.ScrollingViewBehavior_Layout); 1328b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes setOverlayTop(a.getDimensionPixelSize( 132973e7a06fb66110495fa4e98a91831a47feab2526Chris Banes R.styleable.ScrollingViewBehavior_Layout_behavior_overlapTop, 0)); 1330a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes a.recycle(); 1331a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1332a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1333a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1334a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean layoutDependsOn(CoordinatorLayout parent, View child, View dependency) { 1335a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes // We depend on any AppBarLayouts 1336a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return dependency instanceof AppBarLayout; 1337a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1338a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1339a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes @Override 1340a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes public boolean onDependentViewChanged(CoordinatorLayout parent, View child, 1341a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View dependency) { 13425e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes offsetChildAsNeeded(parent, child, dependency); 13430d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes return false; 13440d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes } 13450d2f46331a9fc3b21597e926ba2e061af7c00708Chris Banes 13465e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes private void offsetChildAsNeeded(CoordinatorLayout parent, View child, View dependency) { 1347a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes final CoordinatorLayout.Behavior behavior = 1348a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes ((CoordinatorLayout.LayoutParams) dependency.getLayoutParams()).getBehavior(); 1349a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (behavior instanceof Behavior) { 13505e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // Offset the child, pinning it to the bottom the header-dependency, maintaining 13515e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes // any vertical gap, and overlap 13525e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes final Behavior ablBehavior = (Behavior) behavior; 13535e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes final int offset = ablBehavior.getTopBottomOffsetForScrollingSibling(); 1354318baf84dade07174d71e10322e3b10ab4b0c28cChris Banes ViewCompat.offsetTopAndBottom(child, (dependency.getBottom() - child.getTop()) 13555e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes + ablBehavior.mOffsetDelta 13565e7673e0dbd89512b525d1bde5c912eb07885550Chris Banes + getVerticalLayoutGap() 1357b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes - getOverlapPixelsForOffset(dependency)); 1358ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1359ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1360ea004a01f44aaf36212120c936952c1742d03d30Chris Banes 1361b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes 1362b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes @Override 1363b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes float getOverlapRatioForOffset(final View header) { 1364b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes if (header instanceof AppBarLayout) { 1365b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final AppBarLayout abl = (AppBarLayout) header; 1366ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int totalScrollRange = abl.getTotalScrollRange(); 1367ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int preScrollDown = abl.getDownNestedPreScrollRange(); 1368b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final int offset = getAppBarLayoutOffset(abl); 1369a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1370ea004a01f44aaf36212120c936952c1742d03d30Chris Banes if (preScrollDown != 0 && (totalScrollRange + offset) <= preScrollDown) { 1371ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // If we're in a pre-scroll down. Don't use the offset at all. 1372ea004a01f44aaf36212120c936952c1742d03d30Chris Banes return 0; 1373a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } else { 1374ea004a01f44aaf36212120c936952c1742d03d30Chris Banes final int availScrollRange = totalScrollRange - preScrollDown; 1375dfb857dd12b359c0bdae11a23e039f286d54dc0aChris Banes if (availScrollRange != 0) { 1376ea004a01f44aaf36212120c936952c1742d03d30Chris Banes // Else we'll use a interpolated ratio of the overlap, depending on offset 1377b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 1f + (offset / (float) availScrollRange); 1378ea004a01f44aaf36212120c936952c1742d03d30Chris Banes } 1379a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1380a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1381b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 0f; 1382a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1383a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1384b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes private static int getAppBarLayoutOffset(AppBarLayout abl) { 1385b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes final CoordinatorLayout.Behavior behavior = 1386b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes ((CoordinatorLayout.LayoutParams) abl.getLayoutParams()).getBehavior(); 1387b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes if (behavior instanceof Behavior) { 1388b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return ((Behavior) behavior).getTopBottomOffsetForScrollingSibling(); 1389b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes } 1390b2f568c9c71763ed823b1f9c274077825b5d0c9eChris Banes return 0; 1391a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1392a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes 1393ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 139472a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes View findFirstDependency(List<View> views) { 1395a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes for (int i = 0, z = views.size(); i < z; i++) { 1396a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes View view = views.get(i); 1397a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes if (view instanceof AppBarLayout) { 139872a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes return view; 1399a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1400a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1401a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes return null; 1402a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1403ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor 1404ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor @Override 140572a0913607198c5ce3fa351242ccbdfb3b93f178Chris Banes int getScrollRange(View v) { 1406ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor if (v instanceof AppBarLayout) { 1407ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return ((AppBarLayout) v).getTotalScrollRange(); 1408ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } else { 1409ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor return super.getScrollRange(v); 1410ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1411ec161ac1da9c8ca0e942b01e037ceb1cc51a2f3cMady Mellor } 1412a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes } 1413a6a508b2296730ca6954aaebcca52a9962a5cb55Chris Banes} 1414