Home | History | Annotate | Download | only in launcher3 
      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 
     64     public DropTargetBar(Context context, AttributeSet attrs) {
     65         super(context, attrs);
     66     }
     67 
     68     public DropTargetBar(Context context, AttributeSet attrs, int defStyle) {
     69         super(context, attrs, defStyle);
     70     }
     71 
     72     @Override
     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 
     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 
    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
    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      */
    136     protected void deferOnDragEnd() {
    137         mDeferOnDragEnd = true;
    138     }
    139 
    140     @Override
    141     public void onDragEnd() {
    142         if (!mDeferOnDragEnd) {
    143             animateToVisibility(false);
    144         } else {
    145             mDeferOnDragEnd = false;
    146         }
    147     }
    148 }
    149