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.Animator;
20 import android.animation.AnimatorListenerAdapter;
21 import android.animation.AnimatorSet;
22 import android.animation.ObjectAnimator;
23 import android.animation.TimeInterpolator;
24 import android.content.Context;
25 import android.graphics.Rect;
26 import android.util.AttributeSet;
27 import android.util.Log;
28 import android.view.View;
29 import android.view.accessibility.AccessibilityManager;
30 import android.view.animation.AccelerateDecelerateInterpolator;
31 import android.view.animation.AccelerateInterpolator;
32 import android.view.animation.DecelerateInterpolator;
33 import android.widget.FrameLayout;
34 
35 import com.android.launcher3.util.Thunk;
36 
37 /*
38  * Ths bar will manage the transition between the QSB search bar and the delete drop
39  * targets so that each of the individual IconDropTargets don't have to.
40  */
41 public class SearchDropTargetBar extends FrameLayout implements DragController.DragListener {
42 
43     private static final TimeInterpolator MOVE_DOWN_INTERPOLATOR = new DecelerateInterpolator(0.6f);
44     private static final TimeInterpolator MOVE_UP_INTERPOLATOR = new DecelerateInterpolator(1.5f);
45     private static final TimeInterpolator DEFAULT_INTERPOLATOR = new AccelerateInterpolator();
46 
47     /** The different states that the search bar space can be in. */
48     public enum State {
49         INVISIBLE             (0f, 0f, 0f),
50         INVISIBLE_TRANSLATED  (0f, 0f, -1f),
51         SEARCH_BAR            (1f, 0f, 0f),
52         DROP_TARGET           (0f, 1f, 0f);
53 
54         private final float mSearchBarAlpha;
55         private final float mDropTargetBarAlpha;
56         private final float mTranslation;
57 
State(float sbAlpha, float dtbAlpha, float translation)58         State(float sbAlpha, float dtbAlpha, float translation) {
59             mSearchBarAlpha = sbAlpha;
60             mDropTargetBarAlpha = dtbAlpha;
61             mTranslation = translation;
62         }
63 
64     }
65 
66     private static int DEFAULT_DRAG_FADE_DURATION = 175;
67 
68     private AnimatorSet mCurrentAnimation;
69 
70     private State mState = State.SEARCH_BAR;
71     @Thunk View mQSB;
72     @Thunk View mDropTargetBar;
73     private boolean mDeferOnDragEnd = false;
74     @Thunk boolean mAccessibilityEnabled = false;
75 
76     // Drop targets
77     private ButtonDropTarget mInfoDropTarget;
78     private ButtonDropTarget mDeleteDropTarget;
79     private ButtonDropTarget mUninstallDropTarget;
80 
SearchDropTargetBar(Context context, AttributeSet attrs)81     public SearchDropTargetBar(Context context, AttributeSet attrs) {
82         this(context, attrs, 0);
83     }
84 
SearchDropTargetBar(Context context, AttributeSet attrs, int defStyle)85     public SearchDropTargetBar(Context context, AttributeSet attrs, int defStyle) {
86         super(context, attrs, defStyle);
87     }
88 
setup(Launcher launcher, DragController dragController)89     public void setup(Launcher launcher, DragController dragController) {
90         dragController.addDragListener(this);
91         dragController.setFlingToDeleteDropTarget(mDeleteDropTarget);
92 
93         dragController.addDragListener(mInfoDropTarget);
94         dragController.addDragListener(mDeleteDropTarget);
95         dragController.addDragListener(mUninstallDropTarget);
96 
97         dragController.addDropTarget(mInfoDropTarget);
98         dragController.addDropTarget(mDeleteDropTarget);
99         dragController.addDropTarget(mUninstallDropTarget);
100 
101         mInfoDropTarget.setLauncher(launcher);
102         mDeleteDropTarget.setLauncher(launcher);
103         mUninstallDropTarget.setLauncher(launcher);
104     }
105 
106     @Override
onFinishInflate()107     protected void onFinishInflate() {
108         super.onFinishInflate();
109 
110         // Get the individual components
111         mDropTargetBar = findViewById(R.id.drag_target_bar);
112         mInfoDropTarget = (ButtonDropTarget) mDropTargetBar.findViewById(R.id.info_target_text);
113         mDeleteDropTarget = (ButtonDropTarget) mDropTargetBar.findViewById(R.id.delete_target_text);
114         mUninstallDropTarget = (ButtonDropTarget) mDropTargetBar.findViewById(R.id.uninstall_target_text);
115 
116         mInfoDropTarget.setSearchDropTargetBar(this);
117         mDeleteDropTarget.setSearchDropTargetBar(this);
118         mUninstallDropTarget.setSearchDropTargetBar(this);
119 
120         // Create the various fade animations
121         mDropTargetBar.setAlpha(0f);
122         AlphaUpdateListener.updateVisibility(mDropTargetBar, mAccessibilityEnabled);
123     }
124 
setQsbSearchBar(View qsb)125     public void setQsbSearchBar(View qsb) {
126         mQSB = qsb;
127     }
128 
129     /**
130      * Animates the current search bar state to a new state.  If the {@param duration} is 0, then
131      * the state is applied immediately.
132      */
animateToState(State newState, int duration)133     public void animateToState(State newState, int duration) {
134         animateToState(newState, duration, null);
135     }
136 
animateToState(State newState, int duration, AnimatorSet animation)137     public void animateToState(State newState, int duration, AnimatorSet animation) {
138         if (mState != newState) {
139             mState = newState;
140 
141             // Update the accessibility state
142             AccessibilityManager am = (AccessibilityManager)
143                     getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
144             mAccessibilityEnabled = am.isEnabled();
145 
146             if (mCurrentAnimation != null) {
147                 mCurrentAnimation.cancel();
148                 mCurrentAnimation = null;
149             }
150             mCurrentAnimation = null;
151 
152             if (duration > 0) {
153                 mCurrentAnimation = new AnimatorSet();
154                 mCurrentAnimation.setDuration(duration);
155 
156                 animateAlpha(mDropTargetBar, mState.mDropTargetBarAlpha, DEFAULT_INTERPOLATOR);
157             } else {
158                 mDropTargetBar.setAlpha(mState.mDropTargetBarAlpha);
159                 AlphaUpdateListener.updateVisibility(mDropTargetBar, mAccessibilityEnabled);
160             }
161 
162             if (mQSB != null) {
163                 boolean isVertical = ((Launcher) getContext()).getDeviceProfile()
164                         .isVerticalBarLayout();
165                 float translation = isVertical ? 0 : mState.mTranslation * getMeasuredHeight();
166 
167                 if (duration > 0) {
168                     int translationChange = Float.compare(mQSB.getTranslationY(), translation);
169 
170                     animateAlpha(mQSB, mState.mSearchBarAlpha,
171                             translationChange == 0 ? DEFAULT_INTERPOLATOR
172                                     : (translationChange < 0 ? MOVE_DOWN_INTERPOLATOR
173                                     : MOVE_UP_INTERPOLATOR));
174 
175                     if (translationChange != 0) {
176                         mCurrentAnimation.play(
177                                 ObjectAnimator.ofFloat(mQSB, View.TRANSLATION_Y, translation));
178                     }
179                 } else {
180                     mQSB.setTranslationY(translation);
181                     mQSB.setAlpha(mState.mSearchBarAlpha);
182                     AlphaUpdateListener.updateVisibility(mQSB, mAccessibilityEnabled);
183                 }
184             }
185 
186             // Start the final animation
187             if (duration > 0) {
188                 if (animation != null) {
189                     animation.play(mCurrentAnimation);
190                 } else {
191                     mCurrentAnimation.start();
192                 }
193             }
194         }
195     }
196 
animateAlpha(View v, float alpha, TimeInterpolator interpolator)197     private void animateAlpha(View v, float alpha, TimeInterpolator interpolator) {
198         if (Float.compare(v.getAlpha(), alpha) != 0) {
199             ObjectAnimator anim = ObjectAnimator.ofFloat(v, View.ALPHA, alpha);
200             anim.setInterpolator(interpolator);
201             anim.addListener(new ViewVisiblilyUpdateHandler(v));
202             mCurrentAnimation.play(anim);
203         }
204     }
205 
206     /*
207      * DragController.DragListener implementation
208      */
209     @Override
onDragStart(DragSource source, Object info, int dragAction)210     public void onDragStart(DragSource source, Object info, int dragAction) {
211         animateToState(State.DROP_TARGET, DEFAULT_DRAG_FADE_DURATION);
212     }
213 
214     /**
215      * This is called to defer hiding the delete drop target until the drop animation has completed,
216      * instead of hiding immediately when the drag has ended.
217      */
deferOnDragEnd()218     public void deferOnDragEnd() {
219         mDeferOnDragEnd = true;
220     }
221 
222     @Override
onDragEnd()223     public void onDragEnd() {
224         if (!mDeferOnDragEnd) {
225             animateToState(State.SEARCH_BAR, DEFAULT_DRAG_FADE_DURATION);
226         } else {
227             mDeferOnDragEnd = false;
228         }
229     }
230 
231     /**
232      * @return the bounds of the QSB search bar.
233      */
getSearchBarBounds()234     public Rect getSearchBarBounds() {
235         if (mQSB != null) {
236             final int[] pos = new int[2];
237             mQSB.getLocationOnScreen(pos);
238 
239             final Rect rect = new Rect();
240             rect.left = pos[0];
241             rect.top = pos[1];
242             rect.right = pos[0] + mQSB.getWidth();
243             rect.bottom = pos[1] + mQSB.getHeight();
244             return rect;
245         } else {
246             return null;
247         }
248     }
249 
enableAccessibleDrag(boolean enable)250     public void enableAccessibleDrag(boolean enable) {
251         if (mQSB != null) {
252             mQSB.setVisibility(enable ? View.GONE : View.VISIBLE);
253         }
254         mInfoDropTarget.enableAccessibleDrag(enable);
255         mDeleteDropTarget.enableAccessibleDrag(enable);
256         mUninstallDropTarget.enableAccessibleDrag(enable);
257     }
258 
259     private class ViewVisiblilyUpdateHandler extends AnimatorListenerAdapter {
260         private final View mView;
261 
ViewVisiblilyUpdateHandler(View v)262         ViewVisiblilyUpdateHandler(View v) {
263             mView = v;
264         }
265 
266         @Override
onAnimationStart(Animator animation)267         public void onAnimationStart(Animator animation) {
268             // Ensure that the view is visible for the animation
269             mView.setVisibility(View.VISIBLE);
270         }
271 
272         @Override
onAnimationEnd(Animator animation)273         public void onAnimationEnd(Animator animation){
274             AlphaUpdateListener.updateVisibility(mView, mAccessibilityEnabled);
275         }
276 
277     }
278 }
279