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      1 /*
      2  * Copyright (C) 2014 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.systemui.recents.views;
     18 
     19 import android.graphics.Outline;
     20 import android.graphics.Rect;
     21 import android.view.View;
     22 import android.view.ViewOutlineProvider;
     23 import com.android.systemui.recents.RecentsConfiguration;
     24 
     25 /* An outline provider that has a clip and outline that can be animated. */
     26 public class AnimateableViewBounds extends ViewOutlineProvider {
     27 
     28     RecentsConfiguration mConfig;
     29 
     30     TaskView mSourceView;
     31     Rect mClipRect = new Rect();
     32     Rect mClipBounds = new Rect();
     33     int mCornerRadius;
     34     float mAlpha = 1f;
     35     final float mMinAlpha = 0.25f;
     36 
     37     public AnimateableViewBounds(TaskView source, int cornerRadius) {
     38         mConfig = RecentsConfiguration.getInstance();
     39         mSourceView = source;
     40         mCornerRadius = cornerRadius;
     41         setClipBottom(getClipBottom());
     42     }
     43 
     44     @Override
     45     public void getOutline(View view, Outline outline) {
     46         outline.setAlpha(mMinAlpha + mAlpha / (1f - mMinAlpha));
     47         outline.setRoundRect(mClipRect.left, mClipRect.top,
     48                 mSourceView.getWidth() - mClipRect.right,
     49                 mSourceView.getHeight() - mClipRect.bottom,
     50                 mCornerRadius);
     51     }
     52 
     53     /** Sets the view outline alpha. */
     54     void setAlpha(float alpha) {
     55         if (Float.compare(alpha, mAlpha) != 0) {
     56             mAlpha = alpha;
     57             mSourceView.invalidateOutline();
     58         }
     59     }
     60 
     61     /** Sets the bottom clip. */
     62     public void setClipBottom(int bottom) {
     63         if (bottom != mClipRect.bottom) {
     64             mClipRect.bottom = bottom;
     65             mSourceView.invalidateOutline();
     66             updateClipBounds();
     67             if (!mConfig.useHardwareLayers) {
     68                 mSourceView.mThumbnailView.updateThumbnailVisibility(
     69                         bottom - mSourceView.getPaddingBottom());
     70             }
     71         }
     72     }
     73 
     74     /** Returns the bottom clip. */
     75     public int getClipBottom() {
     76         return mClipRect.bottom;
     77     }
     78 
     79     private void updateClipBounds() {
     80         mClipBounds.set(mClipRect.left, mClipRect.top,
     81                 mSourceView.getWidth() - mClipRect.right,
     82                 mSourceView.getHeight() - mClipRect.bottom);
     83         mSourceView.setClipBounds(mClipBounds);
     84     }
     85 }
     86