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 
17 package com.android.dialer.dialpadview;
18 
19 import android.content.Context;
20 import android.graphics.Canvas;
21 import android.graphics.Paint;
22 import android.graphics.Rect;
23 import android.util.AttributeSet;
24 import android.widget.TextView;
25 
26 /**
27  * This is a custom text view intended only for rendering the numerals (and star and pound) on the
28  * dialpad. TextView has built in top/bottom padding to help account for ascenders/descenders.
29  *
30  * <p>Since vertical space is at a premium on the dialpad, particularly if the font size is scaled
31  * to a larger default, for the dialpad we use this class to more precisely render characters
32  * according to the precise amount of space they need.
33  */
34 public class DialpadTextView extends TextView {
35 
36   private Rect mTextBounds = new Rect();
37   private String mTextStr;
38 
DialpadTextView(Context context, AttributeSet attrs)39   public DialpadTextView(Context context, AttributeSet attrs) {
40     super(context, attrs);
41   }
42 
43   /** Draw the text to fit within the height/width which have been specified during measurement. */
44   @Override
draw(Canvas canvas)45   public void draw(Canvas canvas) {
46     Paint paint = getPaint();
47 
48     // Without this, the draw does not respect the style's specified text color.
49     paint.setColor(getCurrentTextColor());
50 
51     // The text bounds values are relative and can be negative,, so rather than specifying a
52     // standard origin such as 0, 0, we need to use negative of the left/top bounds.
53     // For example, the bounds may be: Left: 11, Right: 37, Top: -77, Bottom: 0
54     canvas.drawText(mTextStr, -mTextBounds.left, -mTextBounds.top, paint);
55   }
56 
57   /**
58    * Calculate the pixel-accurate bounds of the text when rendered, and use that to specify the
59    * height and width.
60    */
61   @Override
onMeasure(int widthMeasureSpec, int heightMeasureSpec)62   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
63     super.onMeasure(widthMeasureSpec, heightMeasureSpec);
64     mTextStr = getText().toString();
65     getPaint().getTextBounds(mTextStr, 0, mTextStr.length(), mTextBounds);
66 
67     int width = resolveSize(mTextBounds.width(), widthMeasureSpec);
68     int height = resolveSize(mTextBounds.height(), heightMeasureSpec);
69     setMeasuredDimension(width, height);
70   }
71 }
72