AnimateableViewBounds.java revision 606b3da71ab64e489e8f65e0b1092138dbfaf7b7 
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
17package com.android.systemui.recents.views;
18
19import android.animation.ObjectAnimator;
20import android.graphics.Outline;
21import android.graphics.Rect;
22import android.view.View;
23import android.view.ViewOutlineProvider;
24import com.android.systemui.recents.RecentsConfiguration;
25
26/* An outline provider that has a clip and outline that can be animated. */
27public class AnimateableViewBounds extends ViewOutlineProvider {
28
29    RecentsConfiguration mConfig;
30
31    TaskView mSourceView;
32    Rect mClipRect = new Rect();
33    Rect mClipBounds = new Rect();
34    int mCornerRadius;
35    float mAlpha = 1f;
36    final float mMinAlpha = 0.25f;
37
38    ObjectAnimator mClipBottomAnimator;
39
40    public AnimateableViewBounds(TaskView source, int cornerRadius) {
41        mConfig = RecentsConfiguration.getInstance();
42        mSourceView = source;
43        mCornerRadius = cornerRadius;
44        setClipBottom(getClipBottom());
45    }
46
47    @Override
48    public void getOutline(View view, Outline outline) {
49        outline.setAlpha(mMinAlpha + mAlpha / (1f - mMinAlpha));
50        outline.setRoundRect(mClipRect.left, mClipRect.top,
51                mSourceView.getWidth() - mClipRect.right,
52                mSourceView.getHeight() - mClipRect.bottom,
53                mCornerRadius);
54    }
55
56    /** Sets the view outline alpha. */
57    void setAlpha(float alpha) {
58        if (Float.compare(alpha, mAlpha) != 0) {
59            mAlpha = alpha;
60            mSourceView.invalidateOutline();
61        }
62    }
63
64    /** Sets the bottom clip. */
65    public void setClipBottom(int bottom) {
66        if (bottom != mClipRect.bottom) {
67            mClipRect.bottom = bottom;
68            mSourceView.invalidateOutline();
69            updateClipBounds();
70            if (!mConfig.useHardwareLayers) {
71                mSourceView.mThumbnailView.updateVisibility(
72                        bottom - mSourceView.getPaddingBottom());
73            }
74        }
75    }
76
77    /** Returns the bottom clip. */
78    public int getClipBottom() {
79        return mClipRect.bottom;
80    }
81
82    private void updateClipBounds() {
83        mClipBounds.set(mClipRect.left, mClipRect.top,
84                mSourceView.getWidth() - mClipRect.right,
85                mSourceView.getHeight() - mClipRect.bottom);
86        mSourceView.setClipBounds(mClipBounds);
87    }
88}
89