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      1 /*
      2  * Copyright (C) 2012 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.camera.drawable;
     18 
     19 import android.content.res.Resources;
     20 import android.graphics.Canvas;
     21 import android.graphics.Color;
     22 import android.graphics.ColorFilter;
     23 import android.graphics.Paint;
     24 import android.graphics.Paint.Align;
     25 import android.graphics.Rect;
     26 import android.graphics.drawable.Drawable;
     27 import android.util.TypedValue;
     28 
     29 
     30 public class TextDrawable extends Drawable {
     31 
     32     private static final int DEFAULT_COLOR = Color.WHITE;
     33     private static final int DEFAULT_TEXTSIZE = 15;
     34 
     35     private Paint mPaint;
     36     private CharSequence mText;
     37     private int mIntrinsicWidth;
     38     private int mIntrinsicHeight;
     39 
     40     public TextDrawable(Resources res, CharSequence text) {
     41         mText = text;
     42         mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
     43         mPaint.setColor(DEFAULT_COLOR);
     44         mPaint.setTextAlign(Align.CENTER);
     45         float textSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,
     46                 DEFAULT_TEXTSIZE, res.getDisplayMetrics());
     47         mPaint.setTextSize(textSize);
     48         mIntrinsicWidth = (int) (mPaint.measureText(mText, 0, mText.length()) + .5);
     49         mIntrinsicHeight = mPaint.getFontMetricsInt(null);
     50     }
     51 
     52     @Override
     53     public void draw(Canvas canvas) {
     54         Rect bounds = getBounds();
     55         canvas.drawText(mText, 0, mText.length(),
     56                 bounds.centerX(), bounds.centerY(), mPaint);
     57     }
     58 
     59     @Override
     60     public int getOpacity() {
     61         return mPaint.getAlpha();
     62     }
     63 
     64     @Override
     65     public int getIntrinsicWidth() {
     66         return mIntrinsicWidth;
     67     }
     68 
     69     @Override
     70     public int getIntrinsicHeight() {
     71         return mIntrinsicHeight;
     72     }
     73 
     74     @Override
     75     public void setAlpha(int alpha) {
     76         mPaint.setAlpha(alpha);
     77     }
     78 
     79     @Override
     80     public void setColorFilter(ColorFilter filter) {
     81         mPaint.setColorFilter(filter);
     82     }
     83 
     84 }
     85