BottomSheetBehavior.java revision 4eb453c75e552a2e0231a93468d9597a4069286e
1452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki/* 2452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * Copyright (C) 2015 The Android Open Source Project 3452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * 4452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * Licensed under the Apache License, Version 2.0 (the "License"); 5452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * you may not use this file except in compliance with the License. 6452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * You may obtain a copy of the License at 7452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * 8452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * http://www.apache.org/licenses/LICENSE-2.0 9452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * 10452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * Unless required by applicable law or agreed to in writing, software 11452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * distributed under the License is distributed on an "AS IS" BASIS, 12452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * See the License for the specific language governing permissions and 14452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * limitations under the License. 15452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 16452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 17452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakipackage android.support.design.widget; 18452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 19452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.content.Context; 20452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.content.res.TypedArray; 21452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.os.Parcel; 22452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.os.Parcelable; 23452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.support.annotation.IntDef; 24dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Arakiimport android.support.annotation.NonNull; 25452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.support.design.R; 26452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.support.v4.view.MotionEventCompat; 279aec720809a123c6193304730acf8b55d6ce5a7aYuichi Arakiimport android.support.v4.view.NestedScrollingChild; 28e3e7063749d095bba8743cad0aeb7164a567890dYuichi Arakiimport android.support.v4.view.VelocityTrackerCompat; 29452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.support.v4.view.ViewCompat; 30452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.support.v4.widget.ViewDragHelper; 31452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.util.AttributeSet; 32452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.view.MotionEvent; 33e3e7063749d095bba8743cad0aeb7164a567890dYuichi Arakiimport android.view.VelocityTracker; 34452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.view.View; 35e3e7063749d095bba8743cad0aeb7164a567890dYuichi Arakiimport android.view.ViewConfiguration; 36452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport android.view.ViewGroup; 37452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 38452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport java.lang.annotation.Retention; 39452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport java.lang.annotation.RetentionPolicy; 40452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakiimport java.lang.ref.WeakReference; 41452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 42452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 43452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki/** 44452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * An interaction behavior plugin for a child view of {@link CoordinatorLayout} to make it work as 45452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * a bottom sheet. 46452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 47452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Arakipublic class BottomSheetBehavior<V extends View> extends CoordinatorLayout.Behavior<V> { 48452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 49452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** 504df3c15e330c2f9730d3aa712f57befec8536dffYuichi Araki * Callback for monitoring events about bottom sheets. 51f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki */ 524df3c15e330c2f9730d3aa712f57befec8536dffYuichi Araki public abstract static class BottomSheetCallback { 53f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 54f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki /** 55f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * Called when the bottom sheet changes its state. 56f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * 57dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki * @param bottomSheet The bottom sheet view. 58dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki * @param newState The new state. This will be one of {@link #STATE_DRAGGING}, 59dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki * {@link #STATE_SETTLING}, {@link #STATE_EXPANDED}, 60dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki * {@link #STATE_COLLAPSED}, or {@link #STATE_HIDDEN}. 61f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki */ 62dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki public abstract void onStateChanged(@NonNull View bottomSheet, @State int newState); 63f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 64f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki /** 65f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * Called when the bottom sheet is being dragged. 66f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * 67dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki * @param bottomSheet The bottom sheet view. 68f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * @param slideOffset The new offset of this bottom sheet within its range, from 0 to 1 69f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * when it is moving upward, and from 0 to -1 when it moving downward. 70f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki */ 71dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki public abstract void onSlide(@NonNull View bottomSheet, float slideOffset); 72f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 73f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 74f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki /** 75452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * The bottom sheet is dragging. 76452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 77452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public static final int STATE_DRAGGING = 1; 78452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 79452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** 80452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * The bottom sheet is settling. 81452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 82452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public static final int STATE_SETTLING = 2; 83452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 84452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** 85452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * The bottom sheet is expanded. 86452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 87452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public static final int STATE_EXPANDED = 3; 88452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 89452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** 90452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * The bottom sheet is collapsed. 91452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 92452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public static final int STATE_COLLAPSED = 4; 93452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 94f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki /** 95f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * The bottom sheet is hidden. 96f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki */ 97f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki public static final int STATE_HIDDEN = 5; 98f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 99452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** @hide */ 100f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki @IntDef({STATE_EXPANDED, STATE_COLLAPSED, STATE_DRAGGING, STATE_SETTLING, STATE_HIDDEN}) 101452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Retention(RetentionPolicy.SOURCE) 102452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public @interface State {} 103452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 104f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki private static final float HIDE_THRESHOLD = 0.5f; 105f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 106f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki private static final float HIDE_FRICTION = 0.1f; 107f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 108e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki private float mMaximumVelocity; 109f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 110452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private int mPeekHeight; 111452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 112452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private int mMinOffset; 113452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 114452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private int mMaxOffset; 115452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 116f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki private boolean mHideable; 117f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 118452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @State 119452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private int mState = STATE_COLLAPSED; 120452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 121452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private ViewDragHelper mViewDragHelper; 122452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 123452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private boolean mIgnoreEvents; 124452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 125e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki private int mLastNestedScrollDy; 126e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki 12749a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki private boolean mNestedScrolled; 12849a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki 129452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private int mParentHeight; 130452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 131452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private WeakReference<V> mViewRef; 132452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 1339aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki private WeakReference<View> mNestedScrollingChildRef; 134f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 1359aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki private BottomSheetCallback mCallback; 136f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 137e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki private VelocityTracker mVelocityTracker; 138e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki 139e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki private int mActivePointerId; 140f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 1414eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki private int mInitialY; 1424eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki 143452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** 144452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * Default constructor for instantiating BottomSheetBehaviors. 145452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 146452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public BottomSheetBehavior() { 147452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 148452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 149452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** 150452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * Default constructor for inflating BottomSheetBehaviors from layout. 151452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * 152452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * @param context The {@link Context}. 153452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * @param attrs The {@link AttributeSet}. 154452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 155452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public BottomSheetBehavior(Context context, AttributeSet attrs) { 156452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki super(context, attrs); 157452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki TypedArray a = context.obtainStyledAttributes(attrs, 158452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki R.styleable.BottomSheetBehavior_Params); 159452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki setPeekHeight(a.getDimensionPixelSize( 160452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki R.styleable.BottomSheetBehavior_Params_behavior_peekHeight, 0)); 161f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki setHideable(a.getBoolean(R.styleable.BottomSheetBehavior_Params_behavior_hideable, false)); 162452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki a.recycle(); 163e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki ViewConfiguration configuration = ViewConfiguration.get(context); 164e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 165452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 166452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 167452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 168452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public Parcelable onSaveInstanceState(CoordinatorLayout parent, V child) { 169452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return new SavedState(super.onSaveInstanceState(parent, child), mState); 170452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 171452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 172452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 173452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public void onRestoreInstanceState(CoordinatorLayout parent, V child, Parcelable state) { 174452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki SavedState ss = (SavedState) state; 175452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki super.onRestoreInstanceState(parent, child, ss.getSuperState()); 176452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki // Intermediate states are restored as collapsed state 177f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki if (ss.state == STATE_DRAGGING || ss.state == STATE_SETTLING) { 178452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mState = STATE_COLLAPSED; 179f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } else { 180f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki mState = ss.state; 181452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 182452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 183452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 184452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 185452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public boolean onLayoutChild(CoordinatorLayout parent, V child, int layoutDirection) { 186452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki // First let the parent lay it out 187f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki if (mState != STATE_DRAGGING && mState != STATE_SETTLING) { 188f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki parent.onLayoutChild(child, layoutDirection); 189f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 190452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki // Offset the bottom sheet 191452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mParentHeight = parent.getHeight(); 192452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mMinOffset = Math.max(0, mParentHeight - child.getHeight()); 193452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mMaxOffset = mParentHeight - mPeekHeight; 194452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (mState == STATE_EXPANDED) { 195452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki ViewCompat.offsetTopAndBottom(child, mMinOffset); 196f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } else if (mHideable && mState == STATE_HIDDEN) { 197f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki ViewCompat.offsetTopAndBottom(child, mParentHeight); 198f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } else if (mState == STATE_COLLAPSED) { 199452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki ViewCompat.offsetTopAndBottom(child, mMaxOffset); 200452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 201452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (mViewDragHelper == null) { 202452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mViewDragHelper = ViewDragHelper.create(parent, mDragCallback); 203452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 204452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mViewRef = new WeakReference<>(child); 2059aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki mNestedScrollingChildRef = new WeakReference<>(findScrollingChild(child)); 206452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return true; 207452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 208452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 209452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 210452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) { 21117fc77f5ca7c91daeab2e110669d9baf9d1a8090Yuichi Araki if (!child.isShown()) { 21217fc77f5ca7c91daeab2e110669d9baf9d1a8090Yuichi Araki return false; 21317fc77f5ca7c91daeab2e110669d9baf9d1a8090Yuichi Araki } 214452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki int action = MotionEventCompat.getActionMasked(event); 215e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki // Record the velocity 216e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (action == MotionEvent.ACTION_DOWN) { 217e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki reset(); 218e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 219e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (mVelocityTracker == null) { 220e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mVelocityTracker = VelocityTracker.obtain(); 221e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 222e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mVelocityTracker.addMovement(event); 223452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki switch (action) { 224452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki case MotionEvent.ACTION_UP: 225452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki case MotionEvent.ACTION_CANCEL: 226e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mActivePointerId = MotionEvent.INVALID_POINTER_ID; 227452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki // Reset the ignore flag 228452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (mIgnoreEvents) { 229452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mIgnoreEvents = false; 230452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return false; 231452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 232452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki break; 233452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki case MotionEvent.ACTION_DOWN: 2344eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki int initialX = (int) event.getX(); 2354eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki mInitialY = (int) event.getY(); 2369aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki View scroll = mNestedScrollingChildRef.get(); 2374eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki if (scroll != null && parent.isPointInChildBounds(scroll, initialX, mInitialY)) { 238e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mActivePointerId = event.getPointerId(event.getActionIndex()); 2399aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki } 240e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mIgnoreEvents = mActivePointerId == MotionEvent.INVALID_POINTER_ID && 2414eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki !parent.isPointInChildBounds(child, initialX, mInitialY); 242452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki break; 243452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 2444eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki if (!mIgnoreEvents && mViewDragHelper.shouldInterceptTouchEvent(event)) { 2454eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki return true; 2464eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki } 2474eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki // We have to handle cases that the ViewDragHelper does not capture the bottom sheet because 2484eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki // it is not the top most view of its parent. This is not necessary when the touch event is 2494eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki // happening over the scrolling content as nested scrolling logic handles that case. 2504eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki View scroll = mNestedScrollingChildRef.get(); 2514eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki return action == MotionEvent.ACTION_MOVE && scroll != null && 2524eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki !mIgnoreEvents && mState != STATE_DRAGGING && 2534eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki !parent.isPointInChildBounds(scroll, (int) event.getX(), (int) event.getY()) && 2544eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki Math.abs(mInitialY - event.getY()) > mViewDragHelper.getTouchSlop(); 255452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 256452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 257452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 258452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public boolean onTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) { 25917fc77f5ca7c91daeab2e110669d9baf9d1a8090Yuichi Araki if (!child.isShown()) { 26017fc77f5ca7c91daeab2e110669d9baf9d1a8090Yuichi Araki return false; 26117fc77f5ca7c91daeab2e110669d9baf9d1a8090Yuichi Araki } 262e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki int action = MotionEventCompat.getActionMasked(event); 263e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (mState == STATE_DRAGGING && action == MotionEvent.ACTION_DOWN) { 264e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki return true; 265e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 266452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mViewDragHelper.processTouchEvent(event); 267e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki // Record the velocity 268e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (action == MotionEvent.ACTION_DOWN) { 269e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki reset(); 270e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 271e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (mVelocityTracker == null) { 272e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mVelocityTracker = VelocityTracker.obtain(); 273e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 274e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mVelocityTracker.addMovement(event); 2754eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki // The ViewDragHelper tries to capture only the top-most View. We have to explicitly tell it 2764eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki // to capture the bottom sheet in case it is not captured and the touch slop is passed. 2774eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki if (action == MotionEvent.ACTION_MOVE) { 2784eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki if (Math.abs(mInitialY - event.getY()) > mViewDragHelper.getTouchSlop()) { 2794eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki mViewDragHelper.captureChildView(child, event.getPointerId(event.getActionIndex())); 2804eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki } 2814eb453c75e552a2e0231a93468d9597a4069286eYuichi Araki } 282452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return true; 283452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 284452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 285e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki @Override 286e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, V child, 287e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki View directTargetChild, View target, int nestedScrollAxes) { 288e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mLastNestedScrollDy = 0; 28949a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki mNestedScrolled = false; 290e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki return (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0; 291e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 292e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki 293e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki @Override 294e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, V child, View target, int dx, 295e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki int dy, int[] consumed) { 296e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki View scrollingChild = mNestedScrollingChildRef.get(); 297e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (target != scrollingChild) { 298e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki return; 299e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 300e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki int currentTop = child.getTop(); 301e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki int newTop = currentTop - dy; 302e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (dy > 0) { // Upward 303e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (newTop < mMinOffset) { 304e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki consumed[1] = currentTop - mMinOffset; 305e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki ViewCompat.offsetTopAndBottom(child, -consumed[1]); 306e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki setStateInternal(STATE_EXPANDED); 307e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } else { 308e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki consumed[1] = dy; 309e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki ViewCompat.offsetTopAndBottom(child, -dy); 310e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki setStateInternal(STATE_DRAGGING); 311e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 312e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } else if (dy < 0) { // Downward 313e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (!ViewCompat.canScrollVertically(target, -1)) { 314e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (newTop <= mMaxOffset || mHideable) { 315e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki consumed[1] = dy; 316e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki ViewCompat.offsetTopAndBottom(child, -dy); 317e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki setStateInternal(STATE_DRAGGING); 318e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } else { 319e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki consumed[1] = currentTop - mMaxOffset; 320e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki ViewCompat.offsetTopAndBottom(child, -consumed[1]); 321e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki setStateInternal(STATE_COLLAPSED); 322e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 323e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 324e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 325e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki dispatchOnSlide(child.getTop()); 326e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mLastNestedScrollDy = dy; 32749a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki mNestedScrolled = true; 328e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 329e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki 330e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki @Override 331e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki public void onStopNestedScroll(CoordinatorLayout coordinatorLayout, V child, View target) { 332e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (child.getTop() == mMinOffset || target != mNestedScrollingChildRef.get() || 33349a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki !mNestedScrolled) { 334e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki return; 335e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 336e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki int top; 337e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki int targetState; 338e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (mLastNestedScrollDy > 0) { 339e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki top = mMinOffset; 340e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki targetState = STATE_EXPANDED; 341e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } else if (mHideable && shouldHide(child, getYVelocity())) { 342e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki top = mParentHeight; 343e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki targetState = STATE_HIDDEN; 34449a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki } else if (mLastNestedScrollDy == 0) { 34549a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki int currentTop = child.getTop(); 34649a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki if (Math.abs(currentTop - mMinOffset) < Math.abs(currentTop - mMaxOffset)) { 34749a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki top = mMinOffset; 34849a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki targetState = STATE_EXPANDED; 34949a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki } else { 35049a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki top = mMaxOffset; 35149a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki targetState = STATE_COLLAPSED; 35249a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki } 353e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } else { 354e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki top = mMaxOffset; 355e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki targetState = STATE_COLLAPSED; 356e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 357e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (mViewDragHelper.smoothSlideViewTo(child, child.getLeft(), top)) { 358e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki setStateInternal(STATE_SETTLING); 359e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki ViewCompat.postOnAnimation(child, new SettleRunnable(child, targetState)); 360e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } else { 361e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki setStateInternal(targetState); 362e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 36349a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki mNestedScrolled = false; 364e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 365e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki 366e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki @Override 367e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki public boolean onNestedPreFling(CoordinatorLayout coordinatorLayout, V child, View target, 368e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki float velocityX, float velocityY) { 369e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki return target == mNestedScrollingChildRef.get() && 370e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki (mState != STATE_EXPANDED || 371e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki super.onNestedPreFling(coordinatorLayout, child, target, 372e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki velocityX, velocityY)); 373e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 374e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki 375452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** 376452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * Sets the height of the bottom sheet when it is collapsed. 377452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * 378452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * @param peekHeight The height of the collapsed bottom sheet in pixels. 379452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * @attr ref android.support.design.R.styleable#BottomSheetBehavior_Params_behavior_peekHeight 380452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 381452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public final void setPeekHeight(int peekHeight) { 382452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mPeekHeight = Math.max(0, peekHeight); 383452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mMaxOffset = mParentHeight - peekHeight; 384452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 385452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 386452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** 387452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * Gets the height of the bottom sheet when it is collapsed. 388452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * 389452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * @return The height of the collapsed bottom sheet. 390452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * @attr ref android.support.design.R.styleable#BottomSheetBehavior_Params_behavior_peekHeight 391452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 392452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public final int getPeekHeight() { 393452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return mPeekHeight; 394452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 395452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 396452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** 397f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * Sets whether this bottom sheet can hide when it is swiped down. 398f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * 399f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * @param hideable {@code true} to make this bottom sheet hideable. 400f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * @attr ref android.support.design.R.styleable#BottomSheetBehavior_Params_behavior_hideable 401f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki */ 402f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki public void setHideable(boolean hideable) { 403f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki mHideable = hideable; 404f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 405f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 406f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki /** 407f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * Gets whether this bottom sheet can hide when it is swiped down. 408f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * 409f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * @return {@code true} if this bottom sheet can hide. 410f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * @attr ref android.support.design.R.styleable#BottomSheetBehavior_Params_behavior_hideable 411f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki */ 412f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki public boolean isHideable() { 413f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki return mHideable; 414f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 415f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 416f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki /** 4174df3c15e330c2f9730d3aa712f57befec8536dffYuichi Araki * Sets a callback to be notified of bottom sheet events. 418f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * 4194df3c15e330c2f9730d3aa712f57befec8536dffYuichi Araki * @param callback The callback to notify when bottom sheet events occur. 420f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki */ 4214df3c15e330c2f9730d3aa712f57befec8536dffYuichi Araki public void setBottomSheetCallback(BottomSheetCallback callback) { 4224df3c15e330c2f9730d3aa712f57befec8536dffYuichi Araki mCallback = callback; 423f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 424f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 425f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki /** 426452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * Sets the state of the bottom sheet. The bottom sheet will transition to that state with 427452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * animation. 428452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * 429f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * @param state One of {@link #STATE_COLLAPSED}, {@link #STATE_EXPANDED}, or 430f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki * {@link #STATE_HIDDEN}. 431452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 432452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public final void setState(@State int state) { 433452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki V child = mViewRef.get(); 434452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (child == null) { 435452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return; 436452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 437452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki int top; 438452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (state == STATE_COLLAPSED) { 439452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki top = mMaxOffset; 440452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } else if (state == STATE_EXPANDED) { 441452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki top = mMinOffset; 442f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } else if (mHideable && state == STATE_HIDDEN) { 443f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki top = mParentHeight; 444452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } else { 445452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki throw new IllegalArgumentException("Illegal state argument: " + state); 446452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 447452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki setStateInternal(STATE_SETTLING); 448452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (mViewDragHelper.smoothSlideViewTo(child, child.getLeft(), top)) { 449452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki ViewCompat.postOnAnimation(child, new SettleRunnable(child, state)); 450452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 451452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 452452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 453452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki /** 454452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * Gets the current state of the bottom sheet. 455452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * 456452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * @return One of {@link #STATE_EXPANDED}, {@link #STATE_COLLAPSED}, {@link #STATE_DRAGGING}, 457452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * and {@link #STATE_SETTLING}. 458452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 459452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @State 460452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public final int getState() { 461452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return mState; 462452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 463452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 464452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private void setStateInternal(@State int state) { 465452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (mState == state) { 466452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return; 467452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 468452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mState = state; 469dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki View bottomSheet = mViewRef.get(); 470dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki if (bottomSheet != null && mCallback != null) { 471dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki mCallback.onStateChanged(bottomSheet, state); 472f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 473f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 474f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 475e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki private void reset() { 476e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mActivePointerId = ViewDragHelper.INVALID_POINTER; 477e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (mVelocityTracker != null) { 478e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mVelocityTracker.recycle(); 479e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mVelocityTracker = null; 480e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 481e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 482e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki 483f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki private boolean shouldHide(View child, float yvel) { 484f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki if (child.getTop() < mMaxOffset) { 485f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki // It should not hide, but collapse. 486f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki return false; 487f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 488f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki final float newTop = child.getTop() + yvel * HIDE_FRICTION; 489f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki return Math.abs(newTop - mMaxOffset) / (float) mPeekHeight > HIDE_THRESHOLD; 490f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 491f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 4929aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki private View findScrollingChild(View view) { 4939aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki if (view instanceof NestedScrollingChild) { 4949aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki return view; 4959aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki } 4969aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki if (view instanceof ViewGroup) { 4979aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki ViewGroup group = (ViewGroup) view; 4989aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki for (int i = 0, count = group.getChildCount(); i < count; i++) { 4999aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki View scrollingChild = findScrollingChild(group.getChildAt(i)); 5009aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki if (scrollingChild != null) { 5019aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki return scrollingChild; 5029aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki } 5039aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki } 5049aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki } 5059aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki return null; 506452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 507452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 508e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki private float getYVelocity() { 509e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki mVelocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 510e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki return VelocityTrackerCompat.getYVelocity(mVelocityTracker, mActivePointerId); 511e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 512e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki 513452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private final ViewDragHelper.Callback mDragCallback = new ViewDragHelper.Callback() { 514452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 515452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 516452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public boolean tryCaptureView(View child, int pointerId) { 517e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (mState == STATE_DRAGGING) { 518e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki return false; 519e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki } 520e3e7063749d095bba8743cad0aeb7164a567890dYuichi Araki if (mState == STATE_EXPANDED && mActivePointerId == pointerId) { 5219aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki View scroll = mNestedScrollingChildRef.get(); 5229aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki if (scroll != null && ViewCompat.canScrollVertically(scroll, -1)) { 5239aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki // Let the content scroll up 5249aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki return false; 5259aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki } 5269aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki } 527f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki return mViewRef != null && mViewRef.get() == child; 528f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 529f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 530f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki @Override 531f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) { 532f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki dispatchOnSlide(top); 533452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 534452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 535452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 536452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public void onViewDragStateChanged(int state) { 537452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (state == ViewDragHelper.STATE_DRAGGING) { 538452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki setStateInternal(STATE_DRAGGING); 539452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 540452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 541452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 542452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 543452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public void onViewReleased(View releasedChild, float xvel, float yvel) { 544452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki int top; 545452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @State int targetState; 546f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki if (yvel < 0) { // Moving up 547452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki top = mMinOffset; 548452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki targetState = STATE_EXPANDED; 549f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } else if (mHideable && shouldHide(releasedChild, yvel)) { 550f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki top = mParentHeight; 551f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki targetState = STATE_HIDDEN; 55249a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki } else if (yvel == 0.f) { 55349a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki int currentTop = releasedChild.getTop(); 55449a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki if (Math.abs(currentTop - mMinOffset) < Math.abs(currentTop - mMaxOffset)) { 55549a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki top = mMinOffset; 55649a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki targetState = STATE_EXPANDED; 55749a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki } else { 55849a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki top = mMaxOffset; 55949a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki targetState = STATE_COLLAPSED; 56049a5904a773a7cfac127c5938671ed078d8ec8f3Yuichi Araki } 561452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } else { 562452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki top = mMaxOffset; 563452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki targetState = STATE_COLLAPSED; 564452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 565452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (mViewDragHelper.settleCapturedViewAt(releasedChild.getLeft(), top)) { 566f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki setStateInternal(STATE_SETTLING); 567452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki ViewCompat.postOnAnimation(releasedChild, 568452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki new SettleRunnable(releasedChild, targetState)); 569f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } else { 570f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki setStateInternal(targetState); 571452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 572452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 573452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 574452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 575452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public int clampViewPositionVertical(View child, int top, int dy) { 576f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki return MathUtils.constrain(top, mMinOffset, mHideable ? mParentHeight : mMaxOffset); 577452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 578452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 579452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 580452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public int clampViewPositionHorizontal(View child, int left, int dx) { 581452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return child.getLeft(); 582452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 583f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 5849aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki @Override 5859aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki public int getViewVerticalDragRange(View child) { 5869aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki if (mHideable) { 5879aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki return mParentHeight - mMinOffset; 5889aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki } else { 5899aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki return mMaxOffset - mMinOffset; 5909aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki } 5919aec720809a123c6193304730acf8b55d6ce5a7aYuichi Araki } 592452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki }; 593452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 594f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki private void dispatchOnSlide(int top) { 595dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki View bottomSheet = mViewRef.get(); 596dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki if (bottomSheet != null && mCallback != null) { 597f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki if (top > mMaxOffset) { 598dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki mCallback.onSlide(bottomSheet, (float) (mMaxOffset - top) / mPeekHeight); 599f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } else { 600dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki mCallback.onSlide(bottomSheet, 601dffd8d4be91b2e5e0ce66ad96867182db0c02fd0Yuichi Araki (float) (mMaxOffset - top) / ((mMaxOffset - mMinOffset))); 602f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 603f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 604f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki } 605f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki 606452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private class SettleRunnable implements Runnable { 607452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 608452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private final View mView; 609452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 610452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @State 611452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki private final int mTargetState; 612452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 613452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki SettleRunnable(View view, @State int targetState) { 614452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mView = view; 615452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki mTargetState = targetState; 616452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 617452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 618452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 619452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public void run() { 620452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (mViewDragHelper != null && mViewDragHelper.continueSettling(true)) { 621452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki ViewCompat.postOnAnimation(mView, this); 622452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } else { 623452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki setStateInternal(mTargetState); 624452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 625452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 626452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 627452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 628452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki protected static class SavedState extends View.BaseSavedState { 629452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 630452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @State 631452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki final int state; 632452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 633452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public SavedState(Parcel source) { 634452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki super(source); 635452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki //noinspection ResourceType 636452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki state = source.readInt(); 637452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 638452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 639452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public SavedState(Parcelable superState, @State int state) { 640452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki super(superState); 641452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki this.state = state; 642452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 643452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 644452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 645452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public void writeToParcel(Parcel out, int flags) { 646452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki super.writeToParcel(out, flags); 647452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki out.writeInt(state); 648452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 649452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 650452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public static final Parcelable.Creator<SavedState> CREATOR = 651452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki new Parcelable.Creator<SavedState>() { 652452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 653452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public SavedState createFromParcel(Parcel source) { 654452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return new SavedState(source); 655452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 656452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 657452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @Override 658452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public SavedState[] newArray(int size) { 659452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return new SavedState[size]; 660452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 661452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki }; 662452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 663452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 664f28a0f76c7a46d61785ef7cbc407c19942ecab46Yuichi Araki /** 665452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * A utility function to get the {@link BottomSheetBehavior} associated with the {@code view}. 666452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * 667452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * @param view The {@link View} with {@link BottomSheetBehavior}. 668452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki * @return The {@link BottomSheetBehavior} associated with the {@code view}. 669452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki */ 670452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki @SuppressWarnings("unchecked") 671452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki public static <V extends View> BottomSheetBehavior<V> from(V view) { 672452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki ViewGroup.LayoutParams params = view.getLayoutParams(); 673452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (!(params instanceof CoordinatorLayout.LayoutParams)) { 674452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki throw new IllegalArgumentException("The view is not a child of CoordinatorLayout"); 675452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 676452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki CoordinatorLayout.Behavior behavior = ((CoordinatorLayout.LayoutParams) params) 677452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki .getBehavior(); 678452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki if (!(behavior instanceof BottomSheetBehavior)) { 679452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki throw new IllegalArgumentException( 680452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki "The view is not associated with BottomSheetBehavior"); 681452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 682452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki return (BottomSheetBehavior<V>) behavior; 683452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki } 684452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki 685452f94d1c58e2a7476019b98c3bf0e4b322d1525Yuichi Araki} 686