1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher3; 18 19 import android.animation.TimeInterpolator; 20 import android.content.Context; 21 import android.util.AttributeSet; 22 import android.view.View; 23 import android.view.ViewDebug; 24 import android.view.ViewPropertyAnimator; 25 import android.view.accessibility.AccessibilityManager; 26 import android.view.animation.AccelerateInterpolator; 27 import android.widget.LinearLayout; 28 29 import com.android.launcher3.dragndrop.DragController; 30 import com.android.launcher3.dragndrop.DragOptions; 31 32 /* 33 * The top bar containing various drop targets: Delete/App Info/Uninstall. 34 */ 35 public class DropTargetBar extends LinearLayout implements DragController.DragListener { 36 37 protected static final int DEFAULT_DRAG_FADE_DURATION = 175; 38 protected static final TimeInterpolator DEFAULT_INTERPOLATOR = new AccelerateInterpolator(); 39 40 private final Runnable mFadeAnimationEndRunnable = new Runnable() { 41 42 @Override 43 public void run() { 44 AccessibilityManager am = (AccessibilityManager) 45 getContext().getSystemService(Context.ACCESSIBILITY_SERVICE); 46 boolean accessibilityEnabled = am.isEnabled(); 47 AlphaUpdateListener.updateVisibility(DropTargetBar.this, accessibilityEnabled); 48 } 49 }; 50 51 @ViewDebug.ExportedProperty(category = "launcher") 52 protected boolean mDeferOnDragEnd; 53 54 @ViewDebug.ExportedProperty(category = "launcher") 55 protected boolean mVisible = false; 56 57 private ViewPropertyAnimator mCurrentAnimation; 58 59 // Drop targets 60 private ButtonDropTarget mDeleteDropTarget; 61 private ButtonDropTarget mAppInfoDropTarget; 62 private ButtonDropTarget mUninstallDropTarget; 63 DropTargetBar(Context context, AttributeSet attrs)64 public DropTargetBar(Context context, AttributeSet attrs) { 65 super(context, attrs); 66 } 67 DropTargetBar(Context context, AttributeSet attrs, int defStyle)68 public DropTargetBar(Context context, AttributeSet attrs, int defStyle) { 69 super(context, attrs, defStyle); 70 } 71 72 @Override onFinishInflate()73 protected void onFinishInflate() { 74 super.onFinishInflate(); 75 76 // Get the individual components 77 mDeleteDropTarget = (ButtonDropTarget) findViewById(R.id.delete_target_text); 78 mAppInfoDropTarget = (ButtonDropTarget) findViewById(R.id.info_target_text); 79 mUninstallDropTarget = (ButtonDropTarget) findViewById(R.id.uninstall_target_text); 80 81 mDeleteDropTarget.setDropTargetBar(this); 82 mAppInfoDropTarget.setDropTargetBar(this); 83 mUninstallDropTarget.setDropTargetBar(this); 84 85 // Initialize with hidden state 86 setAlpha(0f); 87 } 88 setup(DragController dragController)89 public void setup(DragController dragController) { 90 dragController.addDragListener(this); 91 dragController.setFlingToDeleteDropTarget(mDeleteDropTarget); 92 93 dragController.addDragListener(mDeleteDropTarget); 94 dragController.addDragListener(mAppInfoDropTarget); 95 dragController.addDragListener(mUninstallDropTarget); 96 97 dragController.addDropTarget(mDeleteDropTarget); 98 dragController.addDropTarget(mAppInfoDropTarget); 99 dragController.addDropTarget(mUninstallDropTarget); 100 } 101 animateToVisibility(boolean isVisible)102 private void animateToVisibility(boolean isVisible) { 103 if (mVisible != isVisible) { 104 mVisible = isVisible; 105 106 // Cancel any existing animation 107 if (mCurrentAnimation != null) { 108 mCurrentAnimation.cancel(); 109 mCurrentAnimation = null; 110 } 111 112 float finalAlpha = mVisible ? 1 : 0; 113 if (Float.compare(getAlpha(), finalAlpha) != 0) { 114 setVisibility(View.VISIBLE); 115 mCurrentAnimation = animate().alpha(finalAlpha) 116 .setInterpolator(DEFAULT_INTERPOLATOR) 117 .setDuration(DEFAULT_DRAG_FADE_DURATION) 118 .withEndAction(mFadeAnimationEndRunnable); 119 } 120 121 } 122 } 123 124 /* 125 * DragController.DragListener implementation 126 */ 127 @Override onDragStart(DropTarget.DragObject dragObject, DragOptions options)128 public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) { 129 animateToVisibility(true); 130 } 131 132 /** 133 * This is called to defer hiding the delete drop target until the drop animation has completed, 134 * instead of hiding immediately when the drag has ended. 135 */ deferOnDragEnd()136 protected void deferOnDragEnd() { 137 mDeferOnDragEnd = true; 138 } 139 140 @Override onDragEnd()141 public void onDragEnd() { 142 if (!mDeferOnDragEnd) { 143 animateToVisibility(false); 144 } else { 145 mDeferOnDragEnd = false; 146 } 147 } 148 } 149