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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
package com.android.dialer.dialpadview;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.widget.TextView;
/**
* This is a custom text view intended for rendering text on the dialpad. TextView has built-in
* top/bottom padding to help account for ascenders/descenders.
*
* <p>Since vertical space is at a premium on the dialpad, particularly if the font size is scaled
* to a larger default, for the dialpad we use this class to more precisely render characters
* according to the precise amount of space they need.
*/
public class DialpadTextView extends TextView {
private Rect textBounds = new Rect();
private String textStr;
public DialpadTextView(Context context, AttributeSet attrs) {
super(context, attrs);
}
/** Draw the text to fit within the height/width which have been specified during measurement. */
@Override
public void draw(Canvas canvas) {
Paint paint = getPaint();
// Without this, the draw does not respect the style's specified text color.
paint.setColor(getCurrentTextColor());
// The text bounds values are relative and can be negative,, so rather than specifying a
// standard origin such as 0, 0, we need to use negative of the left/top bounds.
// For example, the bounds may be: Left: 11, Right: 37, Top: -77, Bottom: 0
canvas.drawText(textStr, -textBounds.left, -textBounds.top, paint);
}
/**
* Calculate the pixel-accurate bounds of the text when rendered, and use that to specify the
* height and width.
*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
textStr = getText().toString();
getPaint().getTextBounds(textStr, 0, textStr.length(), textBounds);
int width = resolveSize(textBounds.width(), widthMeasureSpec);
int height = resolveSize(textBounds.height(), heightMeasureSpec);
setMeasuredDimension(width, height);
}
}
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