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 17 package com.android.launcher; 18 19 import android.widget.TextView; 20 import android.content.Context; 21 import android.util.AttributeSet; 22 import android.graphics.Canvas; 23 import android.graphics.Paint; 24 import android.graphics.RectF; 25 import android.graphics.drawable.Drawable; 26 import android.text.Layout; 27 28 /** 29 * TextView that draws a bubble behind the text. We cannot use a LineBackgroundSpan 30 * because we want to make the bubble taller than the text and TextView's clip is 31 * too aggressive. 32 */ 33 public class BubbleTextView extends TextView { 34 private static final float CORNER_RADIUS = 8.0f; 35 private static final float PADDING_H = 5.0f; 36 private static final float PADDING_V = 1.0f; 37 38 private final RectF mRect = new RectF(); 39 private Paint mPaint; 40 41 private boolean mBackgroundSizeChanged; 42 private Drawable mBackground; 43 private float mCornerRadius; 44 private float mPaddingH; 45 private float mPaddingV; 46 BubbleTextView(Context context)47 public BubbleTextView(Context context) { 48 super(context); 49 init(); 50 } 51 BubbleTextView(Context context, AttributeSet attrs)52 public BubbleTextView(Context context, AttributeSet attrs) { 53 super(context, attrs); 54 init(); 55 } 56 BubbleTextView(Context context, AttributeSet attrs, int defStyle)57 public BubbleTextView(Context context, AttributeSet attrs, int defStyle) { 58 super(context, attrs, defStyle); 59 init(); 60 } 61 init()62 private void init() { 63 setFocusable(true); 64 mBackground = getBackground(); 65 setBackgroundDrawable(null); 66 mBackground.setCallback(this); 67 68 mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); 69 mPaint.setColor(getContext().getResources().getColor(R.color.bubble_dark_background)); 70 71 final float scale = getContext().getResources().getDisplayMetrics().density; 72 mCornerRadius = CORNER_RADIUS * scale; 73 mPaddingH = PADDING_H * scale; 74 //noinspection PointlessArithmeticExpression 75 mPaddingV = PADDING_V * scale; 76 } 77 78 @Override setFrame(int left, int top, int right, int bottom)79 protected boolean setFrame(int left, int top, int right, int bottom) { 80 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 81 mBackgroundSizeChanged = true; 82 } 83 return super.setFrame(left, top, right, bottom); 84 } 85 86 @Override verifyDrawable(Drawable who)87 protected boolean verifyDrawable(Drawable who) { 88 return who == mBackground || super.verifyDrawable(who); 89 } 90 91 @Override drawableStateChanged()92 protected void drawableStateChanged() { 93 Drawable d = mBackground; 94 if (d != null && d.isStateful()) { 95 d.setState(getDrawableState()); 96 } 97 super.drawableStateChanged(); 98 } 99 100 @Override draw(Canvas canvas)101 public void draw(Canvas canvas) { 102 final Drawable background = mBackground; 103 if (background != null) { 104 final int scrollX = mScrollX; 105 final int scrollY = mScrollY; 106 107 if (mBackgroundSizeChanged) { 108 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 109 mBackgroundSizeChanged = false; 110 } 111 112 if ((scrollX | scrollY) == 0) { 113 background.draw(canvas); 114 } else { 115 canvas.translate(scrollX, scrollY); 116 background.draw(canvas); 117 canvas.translate(-scrollX, -scrollY); 118 } 119 } 120 121 final Layout layout = getLayout(); 122 final RectF rect = mRect; 123 final int left = getCompoundPaddingLeft(); 124 final int top = getExtendedPaddingTop(); 125 126 rect.set(left + layout.getLineLeft(0) - mPaddingH, 127 top + layout.getLineTop(0) - mPaddingV, 128 Math.min(left + layout.getLineRight(0) + mPaddingH, mScrollX + mRight - mLeft), 129 top + layout.getLineBottom(0) + mPaddingV); 130 canvas.drawRoundRect(rect, mCornerRadius, mCornerRadius, mPaint); 131 132 super.draw(canvas); 133 } 134 } 135