ExpandableOutlineView.java revision b0a824687f56b6950338aad169d8d837f8ed657b 
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.statusbar;
18
19import android.content.Context;
20import android.graphics.Outline;
21import android.graphics.Rect;
22import android.graphics.RectF;
23import android.util.AttributeSet;
24import android.view.View;
25import android.view.ViewOutlineProvider;
26
27/**
28 * Like {@link ExpandableView}, but setting an outline for the height and clipping.
29 */
30public abstract class ExpandableOutlineView extends ExpandableView {
31
32    private final Rect mOutlineRect = new Rect();
33    private boolean mCustomOutline;
34    private float mOutlineAlpha = -1f;
35
36    ViewOutlineProvider mProvider = new ViewOutlineProvider() {
37        @Override
38        public void getOutline(View view, Outline outline) {
39            int translation = (int) getTranslation();
40            if (!mCustomOutline) {
41                outline.setRect(translation,
42                        mClipTopAmount,
43                        getWidth() + translation,
44                        Math.max(getActualHeight(), mClipTopAmount));
45            } else {
46                outline.setRect(mOutlineRect);
47            }
48            outline.setAlpha(mOutlineAlpha);
49        }
50    };
51
52    public ExpandableOutlineView(Context context, AttributeSet attrs) {
53        super(context, attrs);
54        setOutlineProvider(mProvider);
55    }
56
57    @Override
58    public void setActualHeight(int actualHeight, boolean notifyListeners) {
59        super.setActualHeight(actualHeight, notifyListeners);
60        invalidateOutline();
61    }
62
63    @Override
64    public void setClipTopAmount(int clipTopAmount) {
65        super.setClipTopAmount(clipTopAmount);
66        invalidateOutline();
67    }
68
69    protected void setOutlineAlpha(float alpha) {
70        if (alpha != mOutlineAlpha) {
71            mOutlineAlpha = alpha;
72            invalidateOutline();
73        }
74    }
75
76    @Override
77    public float getOutlineAlpha() {
78        return mOutlineAlpha;
79    }
80
81    protected void setOutlineRect(RectF rect) {
82        if (rect != null) {
83            setOutlineRect(rect.left, rect.top, rect.right, rect.bottom);
84        } else {
85            mCustomOutline = false;
86            setClipToOutline(false);
87            invalidateOutline();
88        }
89    }
90
91    @Override
92    public int getOutlineTranslation() {
93        return mCustomOutline ? mOutlineRect.left : (int) getTranslation();
94    }
95
96    public void updateOutline() {
97        if (mCustomOutline) {
98            return;
99        }
100        boolean hasOutline = true;
101        if (isChildInGroup()) {
102            hasOutline = isGroupExpanded() && !isGroupExpansionChanging();
103        } else if (isSummaryWithChildren()) {
104            hasOutline = !isGroupExpanded() || isGroupExpansionChanging();
105        }
106        setOutlineProvider(hasOutline ? mProvider : null);
107    }
108
109    public boolean isOutlineShowing() {
110        ViewOutlineProvider op = getOutlineProvider();
111        return op != null;
112    }
113
114    protected void setOutlineRect(float left, float top, float right, float bottom) {
115        mCustomOutline = true;
116        setClipToOutline(true);
117
118        mOutlineRect.set((int) left, (int) top, (int) right, (int) bottom);
119
120        // Outlines need to be at least 1 dp
121        mOutlineRect.bottom = (int) Math.max(top, mOutlineRect.bottom);
122        mOutlineRect.right = (int) Math.max(left, mOutlineRect.right);
123
124        invalidateOutline();
125    }
126
127}
128