/* * 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