Eric Erfanian | ccca315 | 2017-02-22 16:32:36 -0800 | [diff] [blame] | 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 | /** |
linyuh | bd03600 | 2017-10-31 10:29:45 -0700 | [diff] [blame] | 27 | * This is a custom text view intended for rendering text on the dialpad. TextView has built-in |
| 28 | * top/bottom padding to help account for ascenders/descenders. |
Eric Erfanian | ccca315 | 2017-02-22 16:32:36 -0800 | [diff] [blame] | 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 | |
linyuh | 183cb71 | 2017-12-27 17:02:37 -0800 | [diff] [blame] | 36 | private Rect textBounds = new Rect(); |
| 37 | private String textStr; |
Eric Erfanian | ccca315 | 2017-02-22 16:32:36 -0800 | [diff] [blame] | 38 | |
| 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 |
| 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 |
linyuh | 183cb71 | 2017-12-27 17:02:37 -0800 | [diff] [blame] | 54 | canvas.drawText(textStr, -textBounds.left, -textBounds.top, paint); |
Eric Erfanian | ccca315 | 2017-02-22 16:32:36 -0800 | [diff] [blame] | 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 |
| 62 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 63 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); |
linyuh | 183cb71 | 2017-12-27 17:02:37 -0800 | [diff] [blame] | 64 | textStr = getText().toString(); |
| 65 | getPaint().getTextBounds(textStr, 0, textStr.length(), textBounds); |
Eric Erfanian | ccca315 | 2017-02-22 16:32:36 -0800 | [diff] [blame] | 66 | |
linyuh | 183cb71 | 2017-12-27 17:02:37 -0800 | [diff] [blame] | 67 | int width = resolveSize(textBounds.width(), widthMeasureSpec); |
| 68 | int height = resolveSize(textBounds.height(), heightMeasureSpec); |
Eric Erfanian | ccca315 | 2017-02-22 16:32:36 -0800 | [diff] [blame] | 69 | setMeasuredDimension(width, height); |
| 70 | } |
| 71 | } |