AnimateableViewBounds.java revision c041d883c3591670441d4c2da8fd1108dfd28acd 
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.graphics.Outline;
20import android.graphics.Rect;
21import android.view.View;
22import android.view.ViewOutlineProvider;
23import com.android.systemui.recents.RecentsConfiguration;
24
25/* An outline provider that has a clip and outline that can be animated. */
26public 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