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/*
* Copyright (C) 2011 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.bidi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
public class BiDiTestView extends View {
private static final String TAG = "BiDiTestView";
private static final int BORDER_PADDING = 4;
private static final int TEXT_PADDING = 16;
private static final int TEXT_SIZE = 16;
private static final int ORIGIN = 80;
private static final float DEFAULT_ITALIC_SKEW_X = -0.25f;
private Rect rect = new Rect();
private String NORMAL_TEXT;
private String NORMAL_LONG_TEXT;
private String NORMAL_LONG_TEXT_2;
private String NORMAL_LONG_TEXT_3;
private String ITALIC_TEXT;
private String BOLD_TEXT;
private String BOLD_ITALIC_TEXT;
private String ARABIC_TEXT;
private String CHINESE_TEXT;
private String MIXED_TEXT_1;
private String HEBREW_TEXT;
private String RTL_TEXT;
private String THAI_TEXT;
private int currentTextSize;
public BiDiTestView(Context context) {
super(context);
init(context);
}
public BiDiTestView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public BiDiTestView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
private void init(Context context) {
NORMAL_TEXT = context.getString(R.string.normal_text);
NORMAL_LONG_TEXT = context.getString(R.string.normal_long_text);
NORMAL_LONG_TEXT_2 = context.getString(R.string.normal_long_text_2);
NORMAL_LONG_TEXT_3 = context.getString(R.string.normal_long_text_3);
ITALIC_TEXT = context.getString(R.string.italic_text);
BOLD_TEXT = context.getString(R.string.bold_text);
BOLD_ITALIC_TEXT = context.getString(R.string.bold_italic_text);
ARABIC_TEXT = context.getString(R.string.arabic_text);
CHINESE_TEXT = context.getString(R.string.chinese_text);
MIXED_TEXT_1 = context.getString(R.string.mixed_text_1);
HEBREW_TEXT = context.getString(R.string.hebrew_text);
RTL_TEXT = context.getString(R.string.rtl);
THAI_TEXT = context.getString(R.string.pointer_location);
}
public void setCurrentTextSize(int size) {
currentTextSize = size;
invalidate();
}
@Override
public void onDraw(Canvas canvas) {
drawInsideRect(canvas, new Paint(), Color.BLACK);
int deltaX = 0;
deltaX = testString(canvas, NORMAL_TEXT, ORIGIN, ORIGIN,
false, false, Paint.DIRECTION_LTR, currentTextSize);
deltaX += testString(canvas, ITALIC_TEXT, ORIGIN + deltaX, ORIGIN,
true, false, Paint.DIRECTION_LTR, currentTextSize);
deltaX += testString(canvas, BOLD_TEXT, ORIGIN + deltaX, ORIGIN,
false, true, Paint.DIRECTION_LTR, currentTextSize);
deltaX += testString(canvas, BOLD_ITALIC_TEXT, ORIGIN + deltaX, ORIGIN,
true, true, Paint.DIRECTION_LTR, currentTextSize);
// Test with a long string
deltaX = testString(canvas, NORMAL_LONG_TEXT, ORIGIN, ORIGIN + 2 * currentTextSize,
false, false, Paint.DIRECTION_LTR, currentTextSize);
// Test with a long string
deltaX = testString(canvas, NORMAL_LONG_TEXT_2, ORIGIN, ORIGIN + 4 * currentTextSize,
false, false, Paint.DIRECTION_LTR, currentTextSize);
// Test with a long string
deltaX = testString(canvas, NORMAL_LONG_TEXT_3, ORIGIN, ORIGIN + 6 * currentTextSize,
false, false, Paint.DIRECTION_LTR, currentTextSize);
// Test Arabic ligature
deltaX = testString(canvas, ARABIC_TEXT, ORIGIN, ORIGIN + 8 * currentTextSize,
false, false, Paint.DIRECTION_RTL, currentTextSize);
// Test Chinese
deltaX = testString(canvas, CHINESE_TEXT, ORIGIN, ORIGIN + 10 * currentTextSize,
false, false, Paint.DIRECTION_LTR, currentTextSize);
// Test Mixed (English and Arabic)
deltaX = testString(canvas, MIXED_TEXT_1, ORIGIN, ORIGIN + 12 * currentTextSize,
false, false, Paint.DIRECTION_LTR, currentTextSize);
// Test Hebrew
deltaX = testString(canvas, RTL_TEXT, ORIGIN, ORIGIN + 14 * currentTextSize,
false, false, Paint.DIRECTION_RTL, currentTextSize);
// Test Thai
deltaX = testString(canvas, THAI_TEXT, ORIGIN, ORIGIN + 16 * currentTextSize,
false, false, Paint.DIRECTION_LTR, currentTextSize);
}
private int testString(Canvas canvas, String text, int x, int y,
boolean isItalic, boolean isBold, int dir, int textSize) {
TextPaint paint = new TextPaint();
paint.setAntiAlias(true);
// Set paint properties
boolean oldFakeBold = paint.isFakeBoldText();
paint.setFakeBoldText(isBold);
float oldTextSkewX = paint.getTextSkewX();
if (isItalic) {
paint.setTextSkewX(DEFAULT_ITALIC_SKEW_X);
}
paint.setTextSize(textSize);
paint.setColor(Color.WHITE);
canvas.drawText(text, x, y, paint);
int length = text.length();
float[] advances = new float[length];
float textWidthHB = paint.getTextRunAdvances(text, 0, length, 0, length, dir, advances, 0);
setPaintDir(paint, dir);
float textWidthICU = paint.getTextRunAdvances(text, 0, length, 0, length, dir, advances, 0,
1 /* use ICU */);
logAdvances(text, textWidthHB, textWidthICU, advances);
drawMetricsAroundText(canvas, x, y, textWidthHB, textWidthICU, textSize, Color.RED, Color.GREEN);
// Restore old paint properties
paint.setFakeBoldText(oldFakeBold);
paint.setTextSkewX(oldTextSkewX);
return (int) Math.ceil(textWidthHB) + TEXT_PADDING;
}
private void setPaintDir(Paint paint, int dir) {
Log.v(TAG, "Setting Paint dir=" + dir);
paint.setBidiFlags(dir);
}
private void drawInsideRect(Canvas canvas, Paint paint, int color) {
paint.setColor(color);
int width = getWidth();
int height = getHeight();
rect.set(BORDER_PADDING, BORDER_PADDING, width - BORDER_PADDING, height - BORDER_PADDING);
canvas.drawRect(rect, paint);
}
private void drawMetricsAroundText(Canvas canvas, int x, int y, float textWidthHB,
float textWidthICU, int textSize, int color, int colorICU) {
Paint paint = new Paint();
paint.setColor(color);
canvas.drawLine(x, y - textSize, x, y + 8, paint);
canvas.drawLine(x, y + 8, x + textWidthHB, y + 8, paint);
canvas.drawLine(x + textWidthHB, y - textSize, x + textWidthHB, y + 8, paint);
paint.setColor(colorICU);
canvas.drawLine(x + textWidthICU, y - textSize, x + textWidthICU, y + 8, paint);
}
private void logAdvances(String text, float textWidth, float textWidthICU, float[] advances) {
Log.v(TAG, "Advances for text: " + text + " total= " + textWidth + " - totalICU= " + textWidthICU);
// int length = advances.length;
// for(int n=0; n<length; n++){
// Log.v(TAG, "adv[" + n + "]=" + advances[n]);
// }
}
}
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