| /* |
| * Copyright (C) 2016 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 android.text; |
| |
| import static android.text.Layout.Alignment.ALIGN_NORMAL; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertNotNull; |
| import static org.junit.Assert.assertNull; |
| import static org.junit.Assert.assertTrue; |
| |
| import android.graphics.Canvas; |
| import android.graphics.Paint; |
| import android.platform.test.annotations.Presubmit; |
| import android.text.style.ReplacementSpan; |
| import android.util.ArraySet; |
| |
| import androidx.test.filters.SmallTest; |
| import androidx.test.runner.AndroidJUnit4; |
| |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| |
| @Presubmit |
| @SmallTest |
| @RunWith(AndroidJUnit4.class) |
| public class DynamicLayoutTest { |
| private static final int WIDTH = 10000; |
| |
| @Test |
| public void testGetBlocksAlwaysNeedToBeRedrawn_en() { |
| final SpannableStringBuilder builder = new SpannableStringBuilder(); |
| final DynamicLayout layout = new DynamicLayout(builder, new TextPaint(), WIDTH, |
| ALIGN_NORMAL, 0, 0, false); |
| |
| assertNull(layout.getBlocksAlwaysNeedToBeRedrawn()); |
| |
| builder.append("abcd efg\n"); |
| builder.append("hijk lmn\n"); |
| assertNull(layout.getBlocksAlwaysNeedToBeRedrawn()); |
| |
| builder.delete(0, builder.length()); |
| assertNull(layout.getBlocksAlwaysNeedToBeRedrawn()); |
| } |
| |
| private class MockReplacementSpan extends ReplacementSpan { |
| public int getSize(Paint paint, CharSequence text, int start, int end, |
| Paint.FontMetricsInt fm) { |
| return 10; |
| } |
| |
| public void draw(Canvas canvas, CharSequence text, int start, int end, float x, int top, |
| int y, int bottom, Paint paint) { } |
| } |
| |
| @Test |
| public void testGetBlocksAlwaysNeedToBeRedrawn_replacementSpan() { |
| final SpannableStringBuilder builder = new SpannableStringBuilder(); |
| final DynamicLayout layout = new DynamicLayout(builder, new TextPaint(), WIDTH, |
| ALIGN_NORMAL, 0, 0, false); |
| |
| assertNull(layout.getBlocksAlwaysNeedToBeRedrawn()); |
| |
| builder.append("abcd efg\n"); |
| builder.append("hijk lmn\n"); |
| assertNull(layout.getBlocksAlwaysNeedToBeRedrawn()); |
| |
| builder.setSpan(new MockReplacementSpan(), 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); |
| assertNotNull(layout.getBlocksAlwaysNeedToBeRedrawn()); |
| assertTrue(layout.getBlocksAlwaysNeedToBeRedrawn().contains(0)); |
| |
| builder.setSpan(new MockReplacementSpan(), 9, 13, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); |
| assertTrue(layout.getBlocksAlwaysNeedToBeRedrawn().contains(0)); |
| assertTrue(layout.getBlocksAlwaysNeedToBeRedrawn().contains(1)); |
| |
| builder.delete(9, 13); |
| assertTrue(layout.getBlocksAlwaysNeedToBeRedrawn().contains(0)); |
| assertFalse(layout.getBlocksAlwaysNeedToBeRedrawn().contains(1)); |
| |
| builder.delete(0, 4); |
| assertFalse(layout.getBlocksAlwaysNeedToBeRedrawn().contains(0)); |
| assertTrue(layout.getBlocksAlwaysNeedToBeRedrawn().isEmpty()); |
| } |
| |
| @Test |
| public void testGetBlocksAlwaysNeedToBeRedrawn_thai() { |
| final SpannableStringBuilder builder = new SpannableStringBuilder(); |
| final DynamicLayout layout = new DynamicLayout(builder, new TextPaint(), WIDTH, |
| ALIGN_NORMAL, 0, 0, false); |
| |
| assertNull(layout.getBlocksAlwaysNeedToBeRedrawn()); |
| |
| builder.append("\u0E22\u0E34\u0E19\u0E14\u0E35\u0E15\u0E49\u0E2D\u0E19\u0E23\u0E31\u0E1A"); |
| builder.append("\u0E2A\u0E39\u0E48"); |
| assertNull(layout.getBlocksAlwaysNeedToBeRedrawn()); |
| |
| builder.append("\u0E48\u0E48\u0E48\u0E48\u0E48"); |
| assertNotNull(layout.getBlocksAlwaysNeedToBeRedrawn()); |
| assertTrue(layout.getBlocksAlwaysNeedToBeRedrawn().contains(0)); |
| |
| builder.delete(builder.length() -5, builder.length()); |
| assertFalse(layout.getBlocksAlwaysNeedToBeRedrawn().contains(0)); |
| assertTrue(layout.getBlocksAlwaysNeedToBeRedrawn().isEmpty()); |
| } |
| |
| @Test |
| public void testGetLineExtra_withoutLinespacing() { |
| final SpannableStringBuilder text = new SpannableStringBuilder("a\nb\nc"); |
| final TextPaint textPaint = new TextPaint(); |
| |
| // create a StaticLayout to check against |
| final StaticLayout staticLayout = StaticLayout.Builder.obtain(text, 0, |
| text.length(), textPaint, WIDTH) |
| .setAlignment(ALIGN_NORMAL) |
| .setIncludePad(false) |
| .build(); |
| |
| // create the DynamicLayout |
| final DynamicLayout dynamicLayout = new DynamicLayout(text, |
| textPaint, |
| WIDTH, |
| ALIGN_NORMAL, |
| 1f /*spacingMultiplier*/, |
| 0 /*spacingAdd*/, |
| false /*includepad*/); |
| |
| final int lineCount = staticLayout.getLineCount(); |
| assertEquals(lineCount, dynamicLayout.getLineCount()); |
| for (int i = 0; i < lineCount; i++) { |
| assertEquals(staticLayout.getLineExtra(i), dynamicLayout.getLineExtra(i)); |
| } |
| } |
| |
| @Test |
| public void testGetLineExtra_withLinespacing() { |
| final SpannableStringBuilder text = new SpannableStringBuilder("a\nb\nc"); |
| final TextPaint textPaint = new TextPaint(); |
| final float spacingMultiplier = 2f; |
| final float spacingAdd = 4; |
| |
| // create a StaticLayout to check against |
| final StaticLayout staticLayout = StaticLayout.Builder.obtain(text, 0, |
| text.length(), textPaint, WIDTH) |
| .setAlignment(ALIGN_NORMAL) |
| .setIncludePad(false) |
| .setLineSpacing(spacingAdd, spacingMultiplier) |
| .build(); |
| |
| // create the DynamicLayout |
| final DynamicLayout dynamicLayout = new DynamicLayout(text, |
| textPaint, |
| WIDTH, |
| ALIGN_NORMAL, |
| spacingMultiplier, |
| spacingAdd, |
| false /*includepad*/); |
| |
| final int lineCount = staticLayout.getLineCount(); |
| assertEquals(lineCount, dynamicLayout.getLineCount()); |
| for (int i = 0; i < lineCount - 1; i++) { |
| assertEquals(staticLayout.getLineExtra(i), dynamicLayout.getLineExtra(i)); |
| } |
| } |
| |
| @Test(expected = IndexOutOfBoundsException.class) |
| public void testGetLineExtra_withNegativeValue() { |
| final DynamicLayout layout = new DynamicLayout("", new TextPaint(), 10 /*width*/, |
| ALIGN_NORMAL, 1.0f /*spacingMultiplier*/, 0f /*spacingAdd*/, false /*includepad*/); |
| layout.getLineExtra(-1); |
| } |
| |
| @Test(expected = IndexOutOfBoundsException.class) |
| public void testGetLineExtra_withParamGreaterThanLineCount() { |
| final DynamicLayout layout = new DynamicLayout("", new TextPaint(), 10 /*width*/, |
| ALIGN_NORMAL, 1.0f /*spacingMultiplier*/, 0f /*spacingAdd*/, false /*includepad*/); |
| layout.getLineExtra(100); |
| } |
| |
| @Test |
| public void testReflow_afterSpannableEdit() { |
| final String text = "a\nb:\uD83C\uDF1A c \n\uD83C\uDF1A"; |
| final int length = text.length(); |
| final SpannableStringBuilder spannable = new SpannableStringBuilder(text); |
| spannable.setSpan(new MockReplacementSpan(), 4, 6, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); |
| spannable.setSpan(new MockReplacementSpan(), 10, length, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE); |
| |
| final DynamicLayout layout = new DynamicLayout(spannable, new TextPaint(), WIDTH, |
| ALIGN_NORMAL, 1.0f /*spacingMultiplier*/, 0f /*spacingAdd*/, false /*includepad*/); |
| |
| spannable.delete(8, 9); |
| spannable.replace(7, 8, "ch"); |
| |
| layout.reflow(spannable, 0, length, length); |
| final ArraySet<Integer> blocks = layout.getBlocksAlwaysNeedToBeRedrawn(); |
| for (Integer value : blocks) { |
| assertTrue("Block index should not be negative", value >= 0); |
| } |
| } |
| |
| @Test |
| public void testFallbackLineSpacing() { |
| // All glyphs in the fonts are 1em wide. |
| final String[] testFontFiles = { |
| // ascent == 1em, descent == 2em, only supports 'a' and space |
| "ascent1em-descent2em.ttf", |
| // ascent == 3em, descent == 4em, only supports 'b' |
| "ascent3em-descent4em.ttf" |
| }; |
| final String xml = "<?xml version='1.0' encoding='UTF-8'?>" |
| + "<familyset>" |
| + " <family name='sans-serif'>" |
| + " <font weight='400' style='normal'>ascent1em-descent2em.ttf</font>" |
| + " </family>" |
| + " <family>" |
| + " <font weight='400' style='normal'>ascent3em-descent4em.ttf</font>" |
| + " </family>" |
| + "</familyset>"; |
| |
| try (FontFallbackSetup setup = |
| new FontFallbackSetup("DynamicLayout", testFontFiles, xml)) { |
| final TextPaint paint = setup.getPaintFor("sans-serif"); |
| final int textSize = 100; |
| paint.setTextSize(textSize); |
| assertEquals(-textSize, paint.ascent(), 0.0f); |
| assertEquals(2 * textSize, paint.descent(), 0.0f); |
| |
| final int paraWidth = 5 * textSize; |
| final String text = "aaaaa aabaa aaaaa"; // This should result in three lines. |
| |
| // Old line spacing. All lines should get their ascent and descents from the first font. |
| DynamicLayout layout = DynamicLayout.Builder |
| .obtain(text, paint, paraWidth) |
| .setIncludePad(false) |
| .setUseLineSpacingFromFallbacks(false) |
| .build(); |
| assertEquals(3, layout.getLineCount()); |
| assertEquals(-textSize, layout.getLineAscent(0)); |
| assertEquals(2 * textSize, layout.getLineDescent(0)); |
| assertEquals(-textSize, layout.getLineAscent(1)); |
| assertEquals(2 * textSize, layout.getLineDescent(1)); |
| assertEquals(-textSize, layout.getLineAscent(2)); |
| assertEquals(2 * textSize, layout.getLineDescent(2)); |
| |
| // New line spacing. The second line has a 'b', so it needs more ascent and descent. |
| layout = DynamicLayout.Builder |
| .obtain(text, paint, paraWidth) |
| .setIncludePad(false) |
| .setUseLineSpacingFromFallbacks(true) |
| .build(); |
| assertEquals(3, layout.getLineCount()); |
| assertEquals(-textSize, layout.getLineAscent(0)); |
| assertEquals(2 * textSize, layout.getLineDescent(0)); |
| assertEquals(-3 * textSize, layout.getLineAscent(1)); |
| assertEquals(4 * textSize, layout.getLineDescent(1)); |
| assertEquals(-textSize, layout.getLineAscent(2)); |
| assertEquals(2 * textSize, layout.getLineDescent(2)); |
| |
| // The default is the old line spacing, for backward compatibility. |
| layout = DynamicLayout.Builder |
| .obtain(text, paint, paraWidth) |
| .setIncludePad(false) |
| .build(); |
| assertEquals(3, layout.getLineCount()); |
| assertEquals(-textSize, layout.getLineAscent(0)); |
| assertEquals(2 * textSize, layout.getLineDescent(0)); |
| assertEquals(-textSize, layout.getLineAscent(1)); |
| assertEquals(2 * textSize, layout.getLineDescent(1)); |
| assertEquals(-textSize, layout.getLineAscent(2)); |
| assertEquals(2 * textSize, layout.getLineDescent(2)); |
| } |
| } |
| |
| @Test |
| public void testBuilder_defaultTextDirection() { |
| final DynamicLayout.Builder builder = DynamicLayout.Builder |
| .obtain("", new TextPaint(), WIDTH); |
| final DynamicLayout layout = builder.build(); |
| assertEquals(TextDirectionHeuristics.FIRSTSTRONG_LTR, layout.getTextDirectionHeuristic()); |
| } |
| |
| @Test |
| public void testBuilder_setTextDirection() { |
| final DynamicLayout.Builder builder = DynamicLayout.Builder |
| .obtain("", new TextPaint(), WIDTH) |
| .setTextDirection(TextDirectionHeuristics.ANYRTL_LTR); |
| final DynamicLayout layout = builder.build(); |
| assertEquals(TextDirectionHeuristics.ANYRTL_LTR, layout.getTextDirectionHeuristic()); |
| } |
| } |