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      1 /*
      2  * Copyright (C) 2010 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.gallery3d.glrenderer;
     18 
     19 import android.graphics.Bitmap;
     20 import android.graphics.Canvas;
     21 import android.graphics.Color;
     22 import android.graphics.Paint.FontMetricsInt;
     23 import android.graphics.Typeface;
     24 import android.text.TextPaint;
     25 import android.text.TextUtils;
     26 import android.util.FloatMath;
     27 
     28 // StringTexture is a texture shows the content of a specified String.
     29 //
     30 // To create a StringTexture, use the newInstance() method and specify
     31 // the String, the font size, and the color.
     32 public class StringTexture extends CanvasTexture {
     33     private final String mText;
     34     private final TextPaint mPaint;
     35     private final FontMetricsInt mMetrics;
     36 
     37     private StringTexture(String text, TextPaint paint,
     38             FontMetricsInt metrics, int width, int height) {
     39         super(width, height);
     40         mText = text;
     41         mPaint = paint;
     42         mMetrics = metrics;
     43     }
     44 
     45     public static TextPaint getDefaultPaint(float textSize, int color) {
     46         TextPaint paint = new TextPaint();
     47         paint.setTextSize(textSize);
     48         paint.setAntiAlias(true);
     49         paint.setColor(color);
     50         paint.setShadowLayer(2f, 0f, 0f, Color.BLACK);
     51         return paint;
     52     }
     53 
     54     public static StringTexture newInstance(
     55             String text, float textSize, int color) {
     56         return newInstance(text, getDefaultPaint(textSize, color));
     57     }
     58 
     59     public static StringTexture newInstance(
     60             String text, float textSize, int color,
     61             float lengthLimit, boolean isBold) {
     62         TextPaint paint = getDefaultPaint(textSize, color);
     63         if (isBold) {
     64             paint.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
     65         }
     66         if (lengthLimit > 0) {
     67             text = TextUtils.ellipsize(
     68                     text, paint, lengthLimit, TextUtils.TruncateAt.END).toString();
     69         }
     70         return newInstance(text, paint);
     71     }
     72 
     73     private static StringTexture newInstance(String text, TextPaint paint) {
     74         FontMetricsInt metrics = paint.getFontMetricsInt();
     75         int width = (int) FloatMath.ceil(paint.measureText(text));
     76         int height = metrics.bottom - metrics.top;
     77         // The texture size needs to be at least 1x1.
     78         if (width <= 0) width = 1;
     79         if (height <= 0) height = 1;
     80         return new StringTexture(text, paint, metrics, width, height);
     81     }
     82 
     83     @Override
     84     protected void onDraw(Canvas canvas, Bitmap backing) {
     85         canvas.translate(0, -mMetrics.ascent);
     86         canvas.drawText(mText, 0, 0, mPaint);
     87     }
     88 }
     89