| /* |
| * 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 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); |
| } |
| |
| 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); |
| } |
| |
| 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]); |
| // } |
| } |
| } |