ActionMenuButton.java revision 666ea1b28a76aeba74744148b15099254d918671 
1/*
2 * Copyright (C) 2008 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.camera;
18
19import android.content.Context;
20import android.graphics.Canvas;
21import android.graphics.Paint;
22import android.graphics.RectF;
23import android.text.Layout;
24import android.util.AttributeSet;
25import android.widget.TextView;
26
27/**
28 * TextView that draws a bubble behind the text. We cannot use a
29 * LineBackgroundSpan because we want to make the bubble taller than the text
30 * and TextView's clip is too aggressive.
31 */
32public class ActionMenuButton extends TextView {
33    private static final int CORNER_RADIUS = 8;
34    private static final int PADDING_H = 5;
35    private static final int PADDING_V = 1;
36
37    private final RectF mRect = new RectF();
38    private Paint mPaint;
39
40    public ActionMenuButton(Context context) {
41        super(context);
42        init();
43    }
44
45    public ActionMenuButton(Context context, AttributeSet attrs) {
46        super(context, attrs);
47        init();
48    }
49
50    public ActionMenuButton(Context context, AttributeSet attrs, int defStyle) {
51        super(context, attrs, defStyle);
52        init();
53    }
54
55    private void init() {
56        setFocusable(true);
57        // We need extra padding below to prevent the bubble being cut.
58        setPadding(PADDING_H, 0, PADDING_H, PADDING_V);
59
60        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
61        mPaint.setColor(getContext().getResources()
62                .getColor(R.color.bubble_dark_background));
63    }
64
65    @Override
66    protected void drawableStateChanged() {
67        invalidate();
68        super.drawableStateChanged();
69    }
70
71    @Override
72    public void draw(Canvas canvas) {
73        final Layout layout = getLayout();
74        final RectF rect = mRect;
75        final int left = getCompoundPaddingLeft();
76        final int top = getExtendedPaddingTop();
77
78        rect.set(left + layout.getLineLeft(0) - PADDING_H,
79                 top + layout.getLineTop(0) - PADDING_V,
80                 Math.min(left + layout.getLineRight(0) + PADDING_H,
81                          mScrollX + mRight - mLeft),
82                 top + layout.getLineBottom(0) + PADDING_V);
83        canvas.drawRoundRect(rect, CORNER_RADIUS, CORNER_RADIUS, mPaint);
84
85        super.draw(canvas);
86    }
87}
88