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/*
* Copyright (C) 2010 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.gallery3d.ui;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint.FontMetricsInt;
import android.graphics.Typeface;
import android.text.TextPaint;
import android.text.TextUtils;
import android.util.FloatMath;
// StringTexture is a texture shows the content of a specified String.
//
// To create a StringTexture, use the newInstance() method and specify
// the String, the font size, and the color.
class StringTexture extends CanvasTexture {
private final String mText;
private final TextPaint mPaint;
private final FontMetricsInt mMetrics;
private StringTexture(String text, TextPaint paint,
FontMetricsInt metrics, int width, int height) {
super(width, height);
mText = text;
mPaint = paint;
mMetrics = metrics;
}
public static TextPaint getDefaultPaint(float textSize, int color) {
TextPaint paint = new TextPaint();
paint.setTextSize(textSize);
paint.setAntiAlias(true);
paint.setColor(color);
paint.setShadowLayer(2f, 0f, 0f, Color.BLACK);
return paint;
}
public static StringTexture newInstance(
String text, float textSize, int color) {
return newInstance(text, getDefaultPaint(textSize, color));
}
public static StringTexture newInstance(
String text, float textSize, int color,
float lengthLimit, boolean isBold) {
TextPaint paint = getDefaultPaint(textSize, color);
if (isBold) {
paint.setTypeface(Typeface.defaultFromStyle(Typeface.BOLD));
}
if (lengthLimit > 0) {
text = TextUtils.ellipsize(
text, paint, lengthLimit, TextUtils.TruncateAt.END).toString();
}
return newInstance(text, paint);
}
private static StringTexture newInstance(String text, TextPaint paint) {
FontMetricsInt metrics = paint.getFontMetricsInt();
int width = (int) FloatMath.ceil(paint.measureText(text));
int height = metrics.bottom - metrics.top;
// The texture size needs to be at least 1x1.
if (width <= 0) width = 1;
if (height <= 0) height = 1;
return new StringTexture(text, paint, metrics, width, height);
}
@Override
protected void onDraw(Canvas canvas, Bitmap backing) {
canvas.translate(0, -mMetrics.ascent);
canvas.drawText(mText, 0, 0, mPaint);
}
}
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