X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.eclipse.swt.win32.win32.x86_64%2Fsrc%2Forg%2Feclipse%2Fswt%2Fcustom%2FStyledTextRenderer.java;fp=bundles%2Forg.eclipse.swt.win32.win32.x86_64%2Fsrc%2Forg%2Feclipse%2Fswt%2Fcustom%2FStyledTextRenderer.java;h=d972777663321222c5b78f7d49bbabdd5fcd5aeb;hb=6b98970d0458754dd67f789afbd0a39e1e7ac6eb;hp=0000000000000000000000000000000000000000;hpb=56a61575ce0d27b340cb12438c8a7f303842095e;p=simantics%2Fplatform.git

diff --git a/bundles/org.eclipse.swt.win32.win32.x86_64/src/org/eclipse/swt/custom/StyledTextRenderer.java b/bundles/org.eclipse.swt.win32.win32.x86_64/src/org/eclipse/swt/custom/StyledTextRenderer.java
new file mode 100644
index 000000000..d97277766
--- /dev/null
+++ b/bundles/org.eclipse.swt.win32.win32.x86_64/src/org/eclipse/swt/custom/StyledTextRenderer.java
@@ -0,0 +1,1938 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2018 IBM Corporation and others.
+ *
+ * This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License 2.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *     Anton Leherbauer (Wind River Systems) - Bug 439419
+ *     Angelo Zerr <angelo.zerr@gmail.com> - Customize different line spacing of StyledText - Bug 522020
+ *******************************************************************************/
+package org.eclipse.swt.custom;
+
+
+import java.util.*;
+import java.util.List;
+
+import org.eclipse.swt.*;
+import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.widgets.*;
+
+/**
+ * A StyledTextRenderer renders the content of a StyledText widget.
+ * This class can be used to render to the display or to a printer.
+ */
+class StyledTextRenderer {
+	Device device;
+	StyledText styledText;
+	StyledTextContent content;
+
+	/* Custom line spacing */
+	StyledTextLineSpacingProvider lineSpacingProvider;
+	boolean lineSpacingComputing;
+
+	/* Font info */
+	Font regularFont, boldFont, italicFont, boldItalicFont;
+	int tabWidth;
+	int ascent, descent;
+	int averageCharWidth;
+	int tabLength;	//tab length in spaces
+
+	/* Line data */
+	int topIndex = -1;
+	TextLayout[] layouts;
+	int lineCount;
+	LineSizeInfo[] lineSizes;
+	LineInfo[] lines;
+	int maxWidth;
+	int maxWidthLineIndex;
+	boolean idleRunning;
+
+	/* Bullet */
+	Bullet[] bullets;
+	int[] bulletsIndices;
+	int[] redrawLines;
+
+	/* Style data */
+	int[] ranges;
+	int styleCount;
+	StyleRange[] styles;
+	StyleRange[] stylesSet;
+	int stylesSetCount = 0;
+	boolean hasLinks, fixedPitch;
+	final static int BULLET_MARGIN = 8;
+
+	final static boolean COMPACT_STYLES = true;
+	final static boolean MERGE_STYLES = true;
+
+	final static int GROW = 32;
+	final static int IDLE_TIME = 50;
+	final static int CACHE_SIZE = 300;
+
+	final static int BACKGROUND = 1 << 0;
+	final static int ALIGNMENT = 1 << 1;
+	final static int INDENT = 1 << 2;
+	final static int JUSTIFY = 1 << 3;
+	final static int SEGMENTS = 1 << 5;
+	final static int TABSTOPS = 1 << 6;
+	final static int WRAP_INDENT = 1 << 7;
+	final static int SEGMENT_CHARS = 1 << 8;
+	final static int VERTICAL_INDENT = 1 << 9;
+
+	static class LineSizeInfo {
+
+		private static final int RESETED_SIZE = -1;
+
+		/* Line size */
+		int height;
+		int width;
+
+		public LineSizeInfo() {
+			resetSize();
+		}
+
+		/**
+		 * Reset the line size.
+		 */
+		void resetSize() {
+			height = RESETED_SIZE;
+			width = RESETED_SIZE;
+		}
+
+		/**
+		 * Returns true if the TextLayout get from the layout pool can be directly used
+		 * or must be refreshed with styles.
+		 *
+		 * @return true if the TextLayout get from the layout pool can be directly used
+		 *         or must be refreshed with styles.
+		 */
+		boolean canLayout() {
+			return !needsRecalculateWidth();
+		}
+
+		/**
+		 * Returns true if it needs to recalculate the line size and false
+		 * otherwise.
+		 *
+		 * @return true if it needs to recalculate the line size and false
+		 *         otherwise.
+		 */
+		boolean needsRecalculateSize() {
+			return needsRecalculateWidth() || needsRecalculateHeight();
+		}
+
+		/**
+		 * Returns true if it needs to recalculate the line width and false
+		 * otherwise.
+		 *
+		 * @return true if it needs to recalculate the line width and false
+		 *         otherwise.
+		 */
+		boolean needsRecalculateWidth() {
+			return width == RESETED_SIZE;
+		}
+
+		/**
+		 * Returns true if it needs to recalculate the line height and false
+		 * otherwise.
+		 *
+		 * @return true if it needs to recalculate the line height and false
+		 *         otherwise.
+		 */
+		boolean needsRecalculateHeight() {
+			return height == RESETED_SIZE;
+		}
+	}
+
+	static class LineInfo {
+		int flags;
+		Color background;
+		int alignment;
+		int indent;
+		int wrapIndent;
+		boolean justify;
+		int[] segments;
+		char[] segmentsChars;
+		int[] tabStops;
+		int verticalIndent;
+
+		public LineInfo() {
+		}
+		public LineInfo(LineInfo info) {
+			if (info != null) {
+				flags = info.flags;
+				background = info.background;
+				alignment = info.alignment;
+				indent = info.indent;
+				wrapIndent = info.wrapIndent;
+				justify = info.justify;
+				segments = info.segments;
+				segmentsChars = info.segmentsChars;
+				tabStops = info.tabStops;
+				verticalIndent = info.verticalIndent;
+			}
+		}
+	}
+	static int cap (TextLayout layout, int offset) {
+		if (layout == null) return offset;
+		return Math.min (layout.getText().length() -1, Math.max (0, offset));
+	}
+
+StyledTextRenderer(Device device, StyledText styledText) {
+	this.device = device;
+	this.styledText = styledText;
+}
+int addMerge(int[] mergeRanges, StyleRange[] mergeStyles, int mergeCount, int modifyStart, int modifyEnd) {
+	int rangeCount = styleCount << 1;
+	StyleRange endStyle = null;
+	int endStart = 0, endLength = 0;
+	if (modifyEnd < rangeCount) {
+		endStyle = styles[modifyEnd >> 1];
+		endStart = ranges[modifyEnd];
+		endLength = ranges[modifyEnd + 1];
+	}
+	int grow = mergeCount - (modifyEnd - modifyStart);
+	if (rangeCount + grow >= ranges.length) {
+		int[] tmpRanges = new int[ranges.length + grow + (GROW << 1)];
+		System.arraycopy(ranges, 0, tmpRanges, 0, modifyStart);
+		StyleRange[] tmpStyles = new StyleRange[styles.length + (grow >> 1) + GROW];
+		System.arraycopy(styles, 0, tmpStyles, 0, modifyStart >> 1);
+		if (rangeCount > modifyEnd) {
+			System.arraycopy(ranges, modifyEnd, tmpRanges, modifyStart + mergeCount, rangeCount - modifyEnd);
+			System.arraycopy(styles, modifyEnd >> 1, tmpStyles, (modifyStart + mergeCount) >> 1, styleCount - (modifyEnd >> 1));
+		}
+		ranges = tmpRanges;
+		styles = tmpStyles;
+	} else {
+		if (rangeCount > modifyEnd) {
+			System.arraycopy(ranges, modifyEnd, ranges, modifyStart + mergeCount, rangeCount - modifyEnd);
+			System.arraycopy(styles, modifyEnd >> 1, styles, (modifyStart + mergeCount) >> 1, styleCount - (modifyEnd >> 1));
+		}
+	}
+	if (MERGE_STYLES) {
+		int j = modifyStart;
+		for (int i = 0; i < mergeCount; i += 2) {
+			if (j > 0 && ranges[j - 2] + ranges[j - 1] == mergeRanges[i] && mergeStyles[i >> 1].similarTo(styles[(j - 2) >> 1])) {
+				ranges[j - 1] += mergeRanges[i + 1];
+			} else {
+				styles[j >> 1] = mergeStyles[i >> 1];
+				ranges[j++] = mergeRanges[i];
+				ranges[j++] = mergeRanges[i + 1];
+			}
+		}
+		if (endStyle != null && ranges[j - 2] + ranges[j - 1] == endStart && endStyle.similarTo(styles[(j - 2) >> 1])) {
+			ranges[j - 1] += endLength;
+			modifyEnd += 2;
+			mergeCount += 2;
+		}
+		if (rangeCount > modifyEnd) {
+			System.arraycopy(ranges, modifyStart + mergeCount, ranges, j, rangeCount - modifyEnd);
+			System.arraycopy(styles, (modifyStart + mergeCount) >> 1, styles, j >> 1, styleCount - (modifyEnd >> 1));
+		}
+		grow = (j - modifyStart) - (modifyEnd - modifyStart);
+	} else {
+		System.arraycopy(mergeRanges, 0, ranges, modifyStart, mergeCount);
+		System.arraycopy(mergeStyles, 0, styles, modifyStart >> 1, mergeCount >> 1);
+	}
+	styleCount += grow >> 1;
+	return grow;
+}
+int addMerge(StyleRange[] mergeStyles, int mergeCount, int modifyStart, int modifyEnd) {
+	int grow = mergeCount - (modifyEnd - modifyStart);
+	StyleRange endStyle = null;
+	if (modifyEnd < styleCount) endStyle = styles[modifyEnd];
+	if (styleCount + grow >= styles.length) {
+		StyleRange[] tmpStyles = new StyleRange[styles.length + grow + GROW];
+		System.arraycopy(styles, 0, tmpStyles, 0, modifyStart);
+		if (styleCount > modifyEnd) {
+			System.arraycopy(styles, modifyEnd, tmpStyles, modifyStart + mergeCount, styleCount - modifyEnd);
+		}
+		styles = tmpStyles;
+	} else {
+		if (styleCount > modifyEnd) {
+			System.arraycopy(styles, modifyEnd, styles, modifyStart + mergeCount, styleCount - modifyEnd);
+		}
+	}
+	if (MERGE_STYLES) {
+		int j = modifyStart;
+		for (int i = 0; i < mergeCount; i++) {
+			StyleRange newStyle = mergeStyles[i], style;
+			if (j > 0 && (style = styles[j - 1]).start + style.length == newStyle.start && newStyle.similarTo(style)) {
+				style.length += newStyle.length;
+			} else {
+				styles[j++] = newStyle;
+			}
+		}
+		StyleRange style = styles[j - 1];
+		if (endStyle != null && style.start + style.length == endStyle.start && endStyle.similarTo(style)) {
+			style.length += endStyle.length;
+			modifyEnd++;
+			mergeCount++;
+		}
+		if (styleCount > modifyEnd) {
+			System.arraycopy(styles, modifyStart + mergeCount, styles, j, styleCount - modifyEnd);
+		}
+		grow = (j - modifyStart) - (modifyEnd - modifyStart);
+	} else {
+		System.arraycopy(mergeStyles, 0, styles, modifyStart, mergeCount);
+	}
+	styleCount += grow;
+	return grow;
+}
+void calculate(int startLine, int lineCount) {
+	int endLine = startLine + lineCount;
+	if (startLine < 0 || endLine > lineSizes.length) {
+		return;
+	}
+	int hTrim = styledText.leftMargin + styledText.rightMargin + styledText.getCaretWidth();
+	for (int i = startLine; i < endLine; i++) {
+		LineSizeInfo line = getLineSize(i);
+		if (line.needsRecalculateSize()) {
+			TextLayout layout = getTextLayout(i);
+			Rectangle rect = layout.getBounds();
+			line.width = rect.width + hTrim;
+			line.height = rect.height;
+			disposeTextLayout(layout);
+		}
+		if (line.width > maxWidth) {
+			maxWidth = line.width;
+			maxWidthLineIndex = i;
+		}
+	}
+}
+LineSizeInfo getLineSize(int i) {
+	if (lineSizes[i] == null) {
+		lineSizes[i] = new LineSizeInfo();
+	}
+	return lineSizes[i];
+}
+void calculateClientArea () {
+	int index = Math.max (0, styledText.getTopIndex());
+	int lineCount = content.getLineCount();
+	int height = styledText.getClientArea().height;
+	int y = 0;
+	/*
+	 * There exists a possibility of ArrayIndexOutOfBounds Exception in
+	 * below code, exact scenario not known. To avoid this exception added
+	 * check for 'index' value, refer Bug 471192.
+	 */
+	while (height > y && lineCount > index && lineSizes.length > index) {
+		calculate(index, 1);
+		y += lineSizes[index++].height;
+	}
+}
+void calculateIdle () {
+	if (idleRunning) return;
+	Runnable runnable = new Runnable() {
+		@Override
+		public void run() {
+			if (styledText == null) return;
+			int i;
+			long start = System.currentTimeMillis();
+			for (i = 0; i < lineCount; i++) {
+				LineSizeInfo line = getLineSize(i);
+				if (line.needsRecalculateSize()) {
+					calculate(i, 1);
+					if (System.currentTimeMillis() - start > IDLE_TIME) break;
+				}
+			}
+			if (i < lineCount) {
+				Display display = styledText.getDisplay();
+				display.asyncExec(this);
+			} else {
+				idleRunning = false;
+				styledText.setScrollBars(true);
+				ScrollBar bar = styledText.getVerticalBar();
+				if (bar != null) {
+					bar.setSelection(styledText.getVerticalScrollOffset());
+				}
+			}
+		}
+	};
+	Display display = styledText.getDisplay();
+	display.asyncExec(runnable);
+	idleRunning = true;
+}
+void clearLineBackground(int startLine, int count) {
+	if (lines == null) return;
+	for (int i = startLine; i < startLine + count; i++) {
+		LineInfo info = lines[i];
+		if (info != null) {
+			info.flags &= ~BACKGROUND;
+			info.background = null;
+			if (info.flags == 0) lines[i] = null;
+		}
+	}
+}
+void clearLineStyle(int startLine, int count) {
+	if (lines == null) return;
+	for (int i = startLine; i < startLine + count; i++) {
+		LineInfo info = lines[i];
+		if (info != null) {
+			info.flags &= ~(ALIGNMENT | INDENT | VERTICAL_INDENT | WRAP_INDENT | JUSTIFY | TABSTOPS);
+			if (info.flags == 0) lines[i] = null;
+		}
+	}
+}
+void copyInto(StyledTextRenderer renderer) {
+	if (ranges != null) {
+		int[] newRanges = renderer.ranges = new int[styleCount << 1];
+		System.arraycopy(ranges, 0, newRanges, 0, newRanges.length);
+	}
+	if (styles != null) {
+		StyleRange[] newStyles = renderer.styles = new StyleRange[styleCount];
+		for (int i = 0; i < newStyles.length; i++) {
+			newStyles[i] = (StyleRange)styles[i].clone();
+		}
+		renderer.styleCount = styleCount;
+	}
+	if (lines != null) {
+		LineInfo[] newLines = renderer.lines = new LineInfo[lineCount];
+		for (int i = 0; i < newLines.length; i++) {
+			newLines[i] = new LineInfo(lines[i]);
+		}
+		renderer.lineCount = lineCount;
+	}
+}
+void dispose() {
+	if (boldFont != null) boldFont.dispose();
+	if (italicFont != null) italicFont.dispose();
+	if (boldItalicFont != null) boldItalicFont.dispose();
+	boldFont = italicFont = boldItalicFont = null;
+	reset();
+	content = null;
+	device = null;
+	styledText = null;
+}
+void disposeTextLayout (TextLayout layout) {
+	if (layouts != null) {
+		for (int i = 0; i < layouts.length; i++) {
+			if (layouts[i] == layout) return;
+		}
+	}
+	layout.dispose();
+}
+void drawBullet(Bullet bullet, GC gc, int paintX, int paintY, int index, int lineAscent, int lineDescent) {
+	StyleRange style = bullet.style;
+	GlyphMetrics metrics = style.metrics;
+	Color color = style.foreground;
+	if (color != null) gc.setForeground(color);
+	Font font = style.font;
+	if (font != null) gc.setFont(font);
+	String string = "";
+	int type = bullet.type & (ST.BULLET_DOT|ST.BULLET_NUMBER|ST.BULLET_LETTER_LOWER|ST.BULLET_LETTER_UPPER);
+	switch (type) {
+		case ST.BULLET_DOT: string = "\u2022"; break;
+		case ST.BULLET_NUMBER: string = String.valueOf(index + 1); break;
+		case ST.BULLET_LETTER_LOWER: string = String.valueOf((char) (index % 26 + 97)); break;
+		case ST.BULLET_LETTER_UPPER: string = String.valueOf((char) (index % 26 + 65)); break;
+	}
+	if ((bullet.type & ST.BULLET_TEXT) != 0) string += bullet.text;
+	Display display = styledText.getDisplay();
+	TextLayout layout = new TextLayout(display);
+	layout.setText(string);
+	layout.setAscent(lineAscent);
+	layout.setDescent(lineDescent);
+	style = (StyleRange)style.clone();
+	style.metrics = null;
+	if (style.font == null) style.font = getFont(style.fontStyle);
+	layout.setStyle(style, 0, string.length());
+	int x = paintX + Math.max(0, metrics.width - layout.getBounds().width - BULLET_MARGIN);
+	layout.draw(gc, x, paintY);
+	layout.dispose();
+}
+int drawLine(int lineIndex, int paintX, int paintY, GC gc, Color widgetBackground, Color widgetForeground) {
+	TextLayout layout = getTextLayout(lineIndex);
+	String line = content.getLine(lineIndex);
+	int lineOffset = content.getOffsetAtLine(lineIndex);
+	int lineLength = line.length();
+	Point selection = styledText.getSelection();
+	int selectionStart = selection.x - lineOffset;
+	int selectionEnd = selection.y - lineOffset;
+	if (styledText.getBlockSelection()) {
+		selectionStart = selectionEnd = 0;
+	}
+	Rectangle client = styledText.getClientArea();
+	Color lineBackground = getLineBackground(lineIndex, null);
+	StyledTextEvent event = styledText.getLineBackgroundData(lineOffset, line);
+	if (event != null && event.lineBackground != null) lineBackground = event.lineBackground;
+	int height = layout.getBounds().height;
+	int verticalIndent = layout.getVerticalIndent();
+	if (lineBackground != null) {
+		if (verticalIndent > 0) {
+			gc.setBackground(widgetBackground);
+			gc.fillRectangle(client.x, paintY, client.width, verticalIndent);
+		}
+		gc.setBackground(lineBackground);
+		gc.fillRectangle(client.x, paintY + verticalIndent, client.width, height - verticalIndent);
+	} else {
+		gc.setBackground(widgetBackground);
+		styledText.drawBackground(gc, client.x, paintY, client.width, height);
+	}
+	gc.setForeground(widgetForeground);
+	if (selectionStart == selectionEnd || (selectionEnd <= 0 && selectionStart > lineLength - 1)) {
+		layout.draw(gc, paintX, paintY);
+	} else {
+		int start = Math.max(0, selectionStart);
+		int end = Math.min(lineLength, selectionEnd);
+		Color selectionFg = styledText.getSelectionForeground();
+		Color selectionBg = styledText.getSelectionBackground();
+		int flags;
+		if ((styledText.getStyle() & SWT.FULL_SELECTION) != 0) {
+			flags = SWT.FULL_SELECTION;
+		} else {
+			flags = SWT.DELIMITER_SELECTION;
+		}
+		if (selectionStart <= lineLength && lineLength < selectionEnd ) {
+			flags |= SWT.LAST_LINE_SELECTION;
+		}
+		layout.draw(gc, paintX, paintY, start, end - 1, selectionFg, selectionBg, flags);
+	}
+
+	// draw objects
+	Bullet bullet = null;
+	int bulletIndex = -1;
+	if (bullets != null) {
+		if (bulletsIndices != null) {
+			int index = lineIndex - topIndex;
+			if (0 <= index && index < CACHE_SIZE) {
+				bullet = bullets[index];
+				bulletIndex = bulletsIndices[index];
+			}
+		} else {
+			for (int i = 0; i < bullets.length; i++) {
+				bullet = bullets[i];
+				bulletIndex = bullet.indexOf(lineIndex);
+				if (bulletIndex != -1) break;
+			}
+		}
+	}
+	if (bulletIndex != -1 && bullet != null) {
+		FontMetrics metrics = layout.getLineMetrics(0);
+		int lineAscent = metrics.getAscent() + metrics.getLeading();
+		if (bullet.type == ST.BULLET_CUSTOM) {
+			bullet.style.start = lineOffset;
+			styledText.paintObject(gc, paintX, paintY, lineAscent, metrics.getDescent(), bullet.style, bullet, bulletIndex);
+		} else {
+			drawBullet(bullet, gc, paintX, paintY, bulletIndex, lineAscent, metrics.getDescent());
+		}
+	}
+	TextStyle[] styles = layout.getStyles();
+	int[] ranges = null;
+	for (int i = 0; i < styles.length; i++) {
+		if (styles[i].metrics != null) {
+			if (ranges == null) ranges = layout.getRanges();
+			int start = ranges[i << 1];
+			int length = ranges[(i << 1) + 1] - start + 1;
+			Point point = layout.getLocation(start, false);
+			FontMetrics metrics = layout.getLineMetrics(layout.getLineIndex(start));
+			StyleRange style = (StyleRange)((StyleRange)styles[i]).clone();
+			style.start = start + lineOffset;
+			style.length = length;
+			int lineAscent = metrics.getAscent() + metrics.getLeading();
+			styledText.paintObject(gc, point.x + paintX, point.y + paintY, lineAscent, metrics.getDescent(), style, null, 0);
+		}
+	}
+	disposeTextLayout(layout);
+	return height;
+}
+int getBaseline() {
+	return ascent;
+}
+Font getFont(int style) {
+	switch (style) {
+		case SWT.BOLD:
+			if (boldFont != null) return boldFont;
+			return boldFont = new Font(device, getFontData(style));
+		case SWT.ITALIC:
+			if (italicFont != null) return italicFont;
+			return italicFont = new Font(device, getFontData(style));
+		case SWT.BOLD | SWT.ITALIC:
+			if (boldItalicFont != null) return boldItalicFont;
+			return boldItalicFont = new Font(device, getFontData(style));
+		default:
+			return regularFont;
+	}
+}
+FontData[] getFontData(int style) {
+	FontData[] fontDatas = regularFont.getFontData();
+	for (int i = 0; i < fontDatas.length; i++) {
+		fontDatas[i].setStyle(style);
+	}
+	return fontDatas;
+}
+int getHeight () {
+	int defaultLineHeight = getLineHeight();
+	if (styledText.isFixedLineHeight()) {
+		return lineCount * defaultLineHeight + styledText.topMargin + styledText.bottomMargin;
+	}
+	int totalHeight = 0;
+	int width = styledText.getWrapWidth();
+	for (int i = 0; i < lineCount; i++) {
+		LineSizeInfo line = getLineSize(i);
+		int height = line.height;
+		if (line.needsRecalculateHeight()) {
+			if (width > 0) {
+				int length = content.getLine(i).length();
+				height = ((length * averageCharWidth / width) + 1) * defaultLineHeight;
+			} else {
+				height = defaultLineHeight;
+			}
+		}
+		totalHeight += height;
+	}
+	return totalHeight + styledText.topMargin + styledText.bottomMargin;
+}
+boolean hasLink(int offset) {
+	if (offset == -1) return false;
+	int lineIndex = content.getLineAtOffset(offset);
+	int lineOffset = content.getOffsetAtLine(lineIndex);
+	String line = content.getLine(lineIndex);
+	StyledTextEvent event = styledText.getLineStyleData(lineOffset, line);
+	if (event != null) {
+		StyleRange[] styles = event.styles;
+		if (styles != null) {
+			int[] ranges = event.ranges;
+			if (ranges != null) {
+				for (int i = 0; i < ranges.length; i+=2) {
+					if (ranges[i] <= offset && offset < ranges[i] + ranges[i+1] && styles[i >> 1].underline && styles[i >> 1].underlineStyle == SWT.UNDERLINE_LINK) {
+						return true;
+					}
+				}
+			} else {
+				for (int i = 0; i < styles.length; i++) {
+					StyleRange style = styles[i];
+					if (style.start <= offset && offset < style.start + style.length && style.underline && style.underlineStyle == SWT.UNDERLINE_LINK) {
+						return true;
+					}
+				}
+			}
+		}
+	}  else {
+		if (ranges != null) {
+			int rangeCount = styleCount << 1;
+			int index = getRangeIndex(offset, -1, rangeCount);
+			if (index >= rangeCount) return false;
+			int rangeStart = ranges[index];
+			int rangeLength = ranges[index + 1];
+			StyleRange rangeStyle = styles[index >> 1];
+			if (rangeStart <= offset && offset < rangeStart + rangeLength && rangeStyle.underline && rangeStyle.underlineStyle == SWT.UNDERLINE_LINK) {
+				return true;
+			}
+		}
+	}
+	return false;
+}
+int getLineAlignment(int index, int defaultAlignment) {
+	if (lines == null) return defaultAlignment;
+	LineInfo info = lines[index];
+	if (info != null && (info.flags & ALIGNMENT) != 0) {
+		return info.alignment;
+	}
+	return defaultAlignment;
+}
+Color getLineBackground(int index, Color defaultBackground) {
+	if (lines == null) return defaultBackground;
+	LineInfo info = lines[index];
+	if (info != null && (info.flags & BACKGROUND) != 0) {
+		return info.background;
+	}
+	return defaultBackground;
+}
+Bullet getLineBullet (int index, Bullet defaultBullet) {
+	if (bullets == null) return defaultBullet;
+	if (bulletsIndices != null) return defaultBullet;
+	for (int i = 0; i < bullets.length; i++) {
+		Bullet bullet = bullets[i];
+		if (bullet.indexOf(index) != -1) return bullet;
+	}
+	return defaultBullet;
+}
+int getLineHeight() {
+	return ascent + descent;
+}
+int getLineHeight(int lineIndex) {
+	LineSizeInfo line = getLineSize(lineIndex);
+	if (line.needsRecalculateHeight()) {
+		// here we are in "variable line height", the call of calculate which uses TextLayout can be very slow
+		// check if line can use the default line height.
+		if (isVariableHeight(lineIndex)) {
+			calculate(lineIndex, 1);
+		} else {
+			line.height = getLineHeight() + getLineSpacing(lineIndex);
+		}
+	}
+	return line.height;
+}
+/**
+ * Returns true if the given line can use the default line height and false
+ * otherwise.
+ *
+ * @param lineIndex
+ *            line index
+ * @return true if the given line can use the default line height and false
+ *         otherwise.
+ */
+private boolean isVariableHeight(int lineIndex) {
+	if (styledText.isWordWrap()) {
+		// In word wrap mode, the line height must be recomputed with TextLayout
+		return true;
+	}
+	StyleRange[] styles = getStylesForLine(lineIndex);
+	if (styles != null) {
+		for (StyleRange style : styles) {
+			if (style.isVariableHeight()) {
+				// style is variable height
+				return true;
+			}
+		}
+	}
+	return false;
+}
+/**
+ * returns true if the given line index defines custom line spacing and false
+ * otherwise.
+ *
+ * @param lineIndex
+ *            the line index.
+ * @return true if the given line index defines custom line spacing and false
+ *         otherwise.
+ */
+private int getLineSpacing(int lineIndex) {
+	if (styledText.lineSpacing > 0) {
+		return styledText.lineSpacing;
+	} else if (lineSpacingProvider != null) {
+		Integer lineSpacing = lineSpacingProvider.getLineSpacing(lineIndex);
+		if (lineSpacing != null) {
+			return lineSpacing;
+		}
+	}
+	return 0;
+}
+/**
+ * Returns styles range for the given line index and null otherwise.
+ *
+ * @param lineIndex
+ *            the line index.
+ * @return styles range for the given line index and null otherwise.
+ */
+private StyleRange[] getStylesForLine(int lineIndex) {
+	int start = styledText.getOffsetAtLine(lineIndex);
+	int length = styledText.getLine(lineIndex).length();
+	return getStyleRanges(start, length, false);
+}
+int getLineIndent(int index, int defaultIndent) {
+	if (lines == null) return defaultIndent;
+	LineInfo info = lines[index];
+	if (info != null && (info.flags & INDENT) != 0) {
+		return info.indent;
+	}
+	return defaultIndent;
+}
+int getLineVerticalIndent(int index) {
+	if (lines == null) return 0;
+	LineInfo info = lines[index];
+	if (info != null && (info.flags & VERTICAL_INDENT) != 0) {
+		return info.verticalIndent;
+	}
+	return 0;
+}
+int getLineWrapIndent(int index, int defaultWrapIndent) {
+	if (lines == null) return defaultWrapIndent;
+	LineInfo info = lines[index];
+	if (info != null && (info.flags & WRAP_INDENT) != 0) {
+		return info.wrapIndent;
+	}
+	return defaultWrapIndent;
+}
+boolean getLineJustify(int index, boolean defaultJustify) {
+	if (lines == null) return defaultJustify;
+	LineInfo info = lines[index];
+	if (info != null && (info.flags & JUSTIFY) != 0) {
+		return info.justify;
+	}
+	return defaultJustify;
+}
+int[] getLineTabStops(int index, int[] defaultTabStops) {
+	if (lines == null) return defaultTabStops;
+	LineInfo info = lines[index];
+	if (info != null && (info.flags & TABSTOPS) != 0) {
+		return info.tabStops;
+	}
+	return defaultTabStops;
+}
+StyledTextLineSpacingProvider getLineSpacingProvider() {
+	return lineSpacingProvider;
+}
+int getRangeIndex(int offset, int low, int high) {
+	if (styleCount == 0) return 0;
+	if (ranges != null)  {
+		while (high - low > 2) {
+			int index = ((high + low) / 2) / 2 * 2;
+			int end = ranges[index] + ranges[index + 1];
+			if (end > offset) {
+				high = index;
+			} else {
+				low = index;
+			}
+		}
+	} else {
+		while (high - low > 1) {
+			int index = ((high + low) / 2);
+			int end = styles[index].start + styles[index].length;
+			if (end > offset) {
+				high = index;
+			} else {
+				low = index;
+			}
+		}
+	}
+	return high;
+}
+int[] getRanges(int start, int length) {
+	if (length == 0) return null;
+	int[] newRanges;
+	int end = start + length - 1;
+	if (ranges != null) {
+		int rangeCount = styleCount << 1;
+		int rangeStart = getRangeIndex(start, -1, rangeCount);
+		if (rangeStart >= rangeCount) return null;
+		if (ranges[rangeStart] > end) return null;
+		int rangeEnd = Math.min(rangeCount - 2, getRangeIndex(end, rangeStart - 1, rangeCount));
+		if (ranges[rangeEnd] > end) rangeEnd = Math.max(rangeStart, rangeEnd - 2);
+		newRanges = new int[rangeEnd - rangeStart + 2];
+		System.arraycopy(ranges, rangeStart, newRanges, 0, newRanges.length);
+	} else {
+		int rangeStart = getRangeIndex(start, -1, styleCount);
+		if (rangeStart >= styleCount) return null;
+		if (styles[rangeStart].start > end) return null;
+		int rangeEnd = Math.min(styleCount - 1, getRangeIndex(end, rangeStart - 1, styleCount));
+		if (styles[rangeEnd].start > end) rangeEnd = Math.max(rangeStart, rangeEnd - 1);
+		newRanges = new int[(rangeEnd - rangeStart + 1) << 1];
+		for (int i = rangeStart, j = 0; i <= rangeEnd; i++, j += 2) {
+			StyleRange style = styles[i];
+			newRanges[j] = style.start;
+			newRanges[j + 1] = style.length;
+		}
+	}
+	if (start > newRanges[0]) {
+		newRanges[1] = newRanges[0] + newRanges[1] - start;
+		newRanges[0] = start;
+	}
+	if (end < newRanges[newRanges.length - 2] + newRanges[newRanges.length - 1] - 1) {
+		newRanges[newRanges.length - 1] = end - newRanges[newRanges.length - 2] + 1;
+	}
+	return newRanges;
+}
+StyleRange[] getStyleRanges(int start, int length, boolean includeRanges) {
+	if (length == 0) return null;
+	StyleRange[] newStyles;
+	int end = start + length - 1;
+	if (ranges != null) {
+		int rangeCount = styleCount << 1;
+		int rangeStart = getRangeIndex(start, -1, rangeCount);
+		if (rangeStart >= rangeCount) return null;
+		if (ranges[rangeStart] > end) return null;
+		int rangeEnd = Math.min(rangeCount - 2, getRangeIndex(end, rangeStart - 1, rangeCount));
+		if (ranges[rangeEnd] > end) rangeEnd = Math.max(rangeStart, rangeEnd - 2);
+		newStyles = new StyleRange[((rangeEnd - rangeStart) >> 1) + 1];
+		if (includeRanges) {
+			for (int i = rangeStart, j = 0; i <= rangeEnd; i += 2, j++) {
+				newStyles[j] = (StyleRange)styles[i >> 1].clone();
+				newStyles[j].start = ranges[i];
+				newStyles[j].length = ranges[i + 1];
+			}
+		} else {
+			System.arraycopy(styles, rangeStart >> 1, newStyles, 0, newStyles.length);
+		}
+	} else {
+		int rangeStart = getRangeIndex(start, -1, styleCount);
+		if (rangeStart >= styleCount) return null;
+		if (styles[rangeStart].start > end) return null;
+		int rangeEnd = Math.min(styleCount - 1, getRangeIndex(end, rangeStart - 1, styleCount));
+		if (styles[rangeEnd].start > end) rangeEnd = Math.max(rangeStart, rangeEnd - 1);
+		newStyles = new StyleRange[rangeEnd - rangeStart + 1];
+		System.arraycopy(styles, rangeStart, newStyles, 0, newStyles.length);
+	}
+	if (includeRanges || ranges == null) {
+		StyleRange style = newStyles[0];
+		if (start > style.start) {
+			newStyles[0] = style = (StyleRange)style.clone();
+			style.length = style.start + style.length - start;
+			style.start = start;
+		}
+		style = newStyles[newStyles.length - 1];
+		if (end < style.start + style.length - 1) {
+			newStyles[newStyles.length - 1] = style = (StyleRange)style.clone();
+			style.length = end - style.start + 1;
+		}
+	}
+	return newStyles;
+}
+StyleRange getStyleRange(StyleRange style) {
+	if (style.underline && style.underlineStyle == SWT.UNDERLINE_LINK) hasLinks = true;
+	if (style.start == 0 && style.length == 0 && style.fontStyle == SWT.NORMAL) return style;
+	StyleRange clone = (StyleRange)style.clone();
+	clone.start = clone.length = 0;
+	clone.fontStyle = SWT.NORMAL;
+	if (clone.font == null) clone.font = getFont(style.fontStyle);
+	return clone;
+}
+TextLayout getTextLayout(int lineIndex) {
+	if (lineSpacingProvider == null) {
+		return getTextLayout(lineIndex, styledText.getOrientation(), styledText.getWrapWidth(), styledText.lineSpacing);
+	}
+	// Compute line spacing for the given line index.
+	int newLineSpacing = styledText.lineSpacing;
+	Integer spacing = lineSpacingProvider.getLineSpacing(lineIndex);
+	if (spacing != null && spacing.intValue() >= 0) {
+		newLineSpacing = spacing;
+	}
+	// Check if line spacing has not changed
+	if (isSameLineSpacing(lineIndex, newLineSpacing)) {
+		return getTextLayout(lineIndex, styledText.getOrientation(), styledText.getWrapWidth(), newLineSpacing);
+	}
+	// Get text layout with original StyledText line spacing.
+	TextLayout layout = getTextLayout(lineIndex, styledText.getOrientation(), styledText.getWrapWidth(),
+			styledText.lineSpacing);
+	if (layout.getSpacing() != newLineSpacing) {
+		layout.setSpacing(newLineSpacing);
+		if (lineSpacingComputing) {
+			return layout;
+		}
+		try {
+			/* Call of resetCache, setCaretLocation, redraw call getTextLayout method
+			 * To avoid having stack overflow, lineSpacingComputing flag is used to call
+			 * resetCache, setCaretLocation, redraw methods only at the end of the compute of all lines spacing.
+			 */
+			lineSpacingComputing = true;
+			styledText.resetCache(lineIndex, 1);
+			styledText.setCaretLocation();
+			styledText.redraw();
+		} finally {
+			lineSpacingComputing = false;
+		}
+	}
+	return layout;
+}
+boolean isSameLineSpacing(int lineIndex, int newLineSpacing) {
+	if (layouts == null) {
+		return false;
+	}
+	int layoutIndex = lineIndex - topIndex;
+	if (0 <= layoutIndex && layoutIndex < layouts.length) {
+		TextLayout layout = layouts[layoutIndex];
+		return layout != null && !layout.isDisposed() && layout.getSpacing() == newLineSpacing;
+	}
+	return false;
+}
+
+private static final class StyleEntry {
+	public final int start;
+	public final int end;
+	public final TextStyle style;
+
+	public StyleEntry(TextStyle style, int start, int end) {
+		this.style = style;
+		this.start = start;
+		this.end = end;
+	}
+}
+
+TextLayout getTextLayout(int lineIndex, int orientation, int width, int lineSpacing) {
+	TextLayout layout = null;
+	if (styledText != null) {
+		int topIndex = styledText.topIndex > 0 ? styledText.topIndex - 1 : 0;
+		if (layouts == null || topIndex != this.topIndex) {
+			TextLayout[] newLayouts = new TextLayout[CACHE_SIZE];
+			if (layouts != null) {
+				for (int i = 0; i < layouts.length; i++) {
+					if (layouts[i] != null) {
+						int layoutIndex = (i + this.topIndex) - topIndex;
+						if (0 <= layoutIndex && layoutIndex < newLayouts.length) {
+							newLayouts[layoutIndex] = layouts[i];
+						} else {
+							layouts[i].dispose();
+						}
+					}
+				}
+			}
+			if (bullets != null && bulletsIndices != null && topIndex != this.topIndex) {
+				int delta = topIndex - this.topIndex;
+				if (delta > 0) {
+					if (delta < bullets.length) {
+						System.arraycopy(bullets, delta, bullets, 0, bullets.length - delta);
+						System.arraycopy(bulletsIndices, delta, bulletsIndices, 0, bulletsIndices.length - delta);
+					}
+					int startIndex = Math.max(0, bullets.length - delta);
+					for (int i = startIndex; i < bullets.length; i++) bullets[i] = null;
+				} else {
+					if (-delta < bullets.length) {
+						System.arraycopy(bullets, 0, bullets, -delta, bullets.length + delta);
+						System.arraycopy(bulletsIndices, 0, bulletsIndices, -delta, bulletsIndices.length + delta);
+					}
+					int endIndex = Math.min(bullets.length, -delta);
+					for (int i = 0; i < endIndex; i++) bullets[i] = null;
+				}
+			}
+			this.topIndex = topIndex;
+			layouts = newLayouts;
+		}
+		if (layouts != null) {
+			int layoutIndex = lineIndex - topIndex;
+			if (0 <= layoutIndex && layoutIndex < layouts.length) {
+				layout = layouts[layoutIndex];
+				if (layout != null) {
+					// Bug 520374: lineIndex can be >= linesSize.length
+					if(lineIndex < lineSizes.length && getLineSize(lineIndex).canLayout()) {
+						return layout;
+					}
+				} else {
+					layout = layouts[layoutIndex] = new TextLayout(device);
+				}
+			}
+		}
+	}
+	if (layout == null) layout = new TextLayout(device);
+	String line = content.getLine(lineIndex);
+	int lineOffset = content.getOffsetAtLine(lineIndex);
+	int[] segments = null;
+	char[] segmentChars = null;
+	int indent = 0;
+	int wrapIndent = 0;
+	int verticalIndent = 0;
+	int alignment = SWT.LEFT;
+	int textDirection = orientation;
+	boolean justify = false;
+	int[] tabs = {tabWidth};
+	Bullet bullet = null;
+	int[] ranges = null;
+	StyleRange[] styles = null;
+	int rangeStart = 0, styleCount = 0;
+	StyledTextEvent event = null;
+	if (styledText != null) {
+		event = styledText.getBidiSegments(lineOffset, line);
+		if (event != null) {
+			segments = event.segments;
+			segmentChars = event.segmentsChars;
+		}
+		event = styledText.getLineStyleData(lineOffset, line);
+		indent = styledText.indent;
+		wrapIndent = styledText.wrapIndent;
+		alignment = styledText.alignment;
+		if (styledText.isAutoDirection()) {
+			textDirection = SWT.AUTO_TEXT_DIRECTION;
+		} else if ((styledText.getStyle() & SWT.FLIP_TEXT_DIRECTION) != 0) {
+			textDirection = orientation == SWT.RIGHT_TO_LEFT ? SWT.LEFT_TO_RIGHT : SWT.RIGHT_TO_LEFT;
+		}
+		justify = styledText.justify;
+		if (styledText.tabs != null) tabs = styledText.tabs;
+	}
+	if (event != null) {
+		indent = event.indent;
+		verticalIndent = event.verticalIndent;
+		wrapIndent = event.wrapIndent;
+		alignment = event.alignment;
+		justify = event.justify;
+		bullet = event.bullet;
+		ranges = event.ranges;
+		styles = event.styles;
+		if (event.tabStops != null) tabs = event.tabStops;
+		if (styles != null) {
+			styleCount = styles.length;
+			if (styledText.isFixedLineHeight()) {
+				for (int i = 0; i < styleCount; i++) {
+					if (styles[i].isVariableHeight()) {
+						styledText.hasStyleWithVariableHeight = true;
+						styledText.verticalScrollOffset = -1;
+						styledText.redraw();
+						break;
+					}
+				}
+			}
+		}
+		if (bullets == null || bulletsIndices == null) {
+			bullets = new Bullet[CACHE_SIZE];
+			bulletsIndices = new int[CACHE_SIZE];
+		}
+		int index = lineIndex - topIndex;
+		if (0 <= index && index < CACHE_SIZE) {
+			bullets[index] = bullet;
+			bulletsIndices[index] = event.bulletIndex;
+		}
+	} else {
+		if (lines != null) {
+			LineInfo info = lines[lineIndex];
+			if (info != null) {
+				if ((info.flags & INDENT) != 0) indent = info.indent;
+				if ((info.flags & VERTICAL_INDENT) != 0) verticalIndent = info.verticalIndent;
+				if ((info.flags & WRAP_INDENT) != 0) wrapIndent = info.wrapIndent;
+				if ((info.flags & ALIGNMENT) != 0) alignment = info.alignment;
+				if ((info.flags & JUSTIFY) != 0) justify = info.justify;
+				if ((info.flags & SEGMENTS) != 0) segments = info.segments;
+				if ((info.flags & SEGMENT_CHARS) != 0) segmentChars = info.segmentsChars;
+				if ((info.flags & TABSTOPS) != 0) tabs = info.tabStops;
+			}
+		}
+		if (bulletsIndices != null) {
+			bullets = null;
+			bulletsIndices = null;
+		}
+		if (bullets != null) {
+			for (int i = 0; i < bullets.length; i++) {
+				if (bullets[i].indexOf(lineIndex) != -1) {
+					bullet = bullets[i];
+					break;
+				}
+			}
+		}
+		ranges = this.ranges;
+		styles = this.styles;
+		styleCount = this.styleCount;
+		if (ranges != null) {
+			rangeStart = getRangeIndex(lineOffset, -1, styleCount << 1);
+		} else {
+			rangeStart = getRangeIndex(lineOffset, -1, styleCount);
+		}
+	}
+	if (bullet != null) {
+		StyleRange style = bullet.style;
+		GlyphMetrics metrics = style.metrics;
+		indent += metrics.width;
+	}
+
+	// prepare styles, as it may change the line content, do it before calling layout.setText()
+	// This needs to happen early to handle the case of GlyphMetrics on \t.
+	// The root cause is that TextLayout doesn't return the right value for the bounds when
+	// GlyphMetrics are applied on \t. A better fix could be implemented directly in (all 3)
+	// TextLayout classes.
+	List<StyleEntry> styleEntries = new ArrayList<>();
+	int lastOffset = 0;
+	int length = line.length();
+	if (styles != null) {
+		if (ranges != null) {
+			int rangeCount = styleCount << 1;
+			for (int i = rangeStart; i < rangeCount; i += 2) {
+				int start, end;
+				if (lineOffset > ranges[i]) {
+					start = 0;
+					end = Math.min (length, ranges[i + 1] - lineOffset + ranges[i]);
+				} else {
+					start = ranges[i] - lineOffset;
+					end = Math.min(length, start + ranges[i + 1]);
+				}
+				if (start >= length) break;
+				if (lastOffset < start) {
+					styleEntries.add(new StyleEntry(null, lastOffset, start - 1));
+				}
+				TextStyle style = getStyleRange(styles[i >> 1]);
+				int endIndex = Math.max(start, Math.min(length, end + 1));
+				if (style.metrics != null && line.substring(start, endIndex).contains("\t")) {
+					line =
+						line.substring(0, start) +
+						line.substring(start, endIndex).replace('\t', ' ') +
+						(end < line.length() ? line.substring(end + 1, line.length()) : "");
+				}
+				styleEntries.add(new StyleEntry(style, start, end));
+				lastOffset = Math.max(lastOffset, end);
+			}
+		} else {
+			for (int i = rangeStart; i < styleCount; i++) {
+				int start, end;
+				if (lineOffset > styles[i].start) {
+					start = 0;
+					end = Math.min (length, styles[i].length - lineOffset + styles[i].start);
+				} else {
+					start = styles[i].start - lineOffset;
+					end = Math.min(length, start + styles[i].length);
+				}
+				if (start >= length) break;
+				if (lastOffset < start) {
+					styleEntries.add(new StyleEntry(null, lastOffset, start - 1));
+				}
+				TextStyle style = getStyleRange(styles[i]);
+				int endIndex = Math.max(start, Math.min(length, end + 1));
+				if (style.metrics != null && line.substring(start, endIndex).contains("\t")) {
+					line =
+						line.substring(0, start) +
+						line.substring(start, endIndex).replace('\t', ' ') +
+						(end < line.length() ? line.substring(end + 1, line.length()) : "");
+				}
+				styleEntries.add(new StyleEntry(style, start, end));
+				lastOffset = Math.max(lastOffset, end);
+			}
+		}
+	}
+	if (lastOffset < length) styleEntries.add(new StyleEntry(null, lastOffset, length));
+
+	layout.setFont(regularFont);
+	layout.setAscent(ascent);
+	layout.setDescent(descent);
+	layout.setText(line);
+	layout.setOrientation(orientation);
+	layout.setSegments(segments);
+	layout.setSegmentsChars(segmentChars);
+	layout.setWidth(width);
+	layout.setSpacing(lineSpacing);
+	layout.setTabs(tabs);
+	layout.setDefaultTabWidth(tabLength);
+	layout.setIndent(indent);
+	layout.setVerticalIndent(verticalIndent);
+	layout.setWrapIndent(wrapIndent);
+	layout.setAlignment(alignment);
+	layout.setJustify(justify);
+	layout.setTextDirection(textDirection);
+	// apply styles, must be done after layout.setText()
+	for (StyleEntry styleEntry : styleEntries) {
+		layout.setStyle(styleEntry.style, styleEntry.start, styleEntry.end);
+	}
+
+	if (styledText != null && styledText.ime != null) {
+		IME ime = styledText.ime;
+		int compositionOffset = ime.getCompositionOffset();
+		if (compositionOffset != -1) {
+			int commitCount = ime.getCommitCount();
+			int compositionLength = ime.getText().length();
+			if (compositionLength != commitCount) {
+				int compositionLine = content.getLineAtOffset(compositionOffset);
+				if (compositionLine == lineIndex) {
+					int[] imeRanges = ime.getRanges();
+					TextStyle[] imeStyles = ime.getStyles();
+					if (imeRanges.length > 0) {
+						for (int i = 0; i < imeStyles.length; i++) {
+							int start = imeRanges[i*2] - lineOffset;
+							int end = imeRanges[i*2+1] - lineOffset;
+							TextStyle imeStyle = imeStyles[i], userStyle;
+							for (int j = start; j <= end; j++) {
+								if (!(0 <= j && j < length)) break;
+								userStyle = layout.getStyle(cap(layout, j));
+								if (userStyle == null && j > 0) userStyle = layout.getStyle(cap(layout, j - 1));
+								if (userStyle == null && j + 1 < length) userStyle = layout.getStyle(cap(layout, j + 1));
+								if (userStyle == null) {
+									layout.setStyle(imeStyle, j, j);
+								} else {
+									TextStyle newStyle = new TextStyle(imeStyle);
+									if (newStyle.font == null) newStyle.font = userStyle.font;
+									if (newStyle.foreground == null) newStyle.foreground = userStyle.foreground;
+									if (newStyle.background == null) newStyle.background = userStyle.background;
+									layout.setStyle(newStyle, j, j);
+								}
+							}
+						}
+					} else {
+						int start = compositionOffset - lineOffset;
+						int end = start + compositionLength - 1;
+						TextStyle userStyle = layout.getStyle(cap(layout, start));
+						if (userStyle == null) {
+							if (start > 0) userStyle = layout.getStyle(cap(layout, start - 1));
+							if (userStyle == null && end + 1 < length) userStyle = layout.getStyle(cap(layout, end + 1));
+							if (userStyle != null) {
+								TextStyle newStyle = new TextStyle();
+								newStyle.font = userStyle.font;
+								newStyle.foreground = userStyle.foreground;
+								newStyle.background = userStyle.background;
+								layout.setStyle(newStyle, start, end);
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
+	if (styledText != null && styledText.isFixedLineHeight()) {
+		int index = -1;
+		int lineCount = layout.getLineCount();
+		int height = getLineHeight();
+		for (int i = 0; i < lineCount; i++) {
+			int lineHeight = layout.getLineBounds(i).height;
+			if (lineHeight > height) {
+				height = lineHeight;
+				index = i;
+			}
+		}
+		if (index != -1) {
+			FontMetrics metrics = layout.getLineMetrics(index);
+			ascent = metrics.getAscent() + metrics.getLeading();
+			descent = metrics.getDescent();
+			if (layouts != null) {
+				for (int i = 0; i < layouts.length; i++) {
+					if (layouts[i] != null && layouts[i] != layout) {
+						layouts[i].setAscent(ascent);
+						layouts[i].setDescent(descent);
+					}
+				}
+			}
+			styledText.calculateScrollBars();
+			if (styledText.verticalScrollOffset != 0) {
+				int topIndex = styledText.topIndex;
+				int topIndexY = styledText.topIndexY;
+				int lineHeight = getLineHeight();
+				int newVerticalScrollOffset;
+				if (topIndexY >= 0) {
+					newVerticalScrollOffset = (topIndex - 1) * lineHeight + lineHeight - topIndexY;
+				} else {
+					newVerticalScrollOffset = topIndex * lineHeight - topIndexY;
+				}
+				styledText.scrollVertical(newVerticalScrollOffset - styledText.verticalScrollOffset, true);
+			}
+			if (styledText.isBidiCaret()) styledText.createCaretBitmaps();
+			styledText.caretDirection = SWT.NULL;
+			styledText.setCaretLocation();
+			styledText.redraw();
+		}
+	}
+	return layout;
+}
+int getWidth() {
+	return maxWidth;
+}
+void reset() {
+	if (layouts != null) {
+		for (int i = 0; i < layouts.length; i++) {
+			TextLayout layout = layouts[i];
+			if (layout != null) layout.dispose();
+		}
+		layouts = null;
+	}
+	topIndex = -1;
+	stylesSetCount = styleCount = lineCount = 0;
+	ranges = null;
+	styles = null;
+	stylesSet = null;
+	lines = null;
+	lineSizes = null;
+	bullets = null;
+	bulletsIndices = null;
+	redrawLines = null;
+	hasLinks = false;
+}
+void reset(int startLine, int lineCount) {
+	int endLine = startLine + lineCount;
+	if (startLine < 0 || endLine > lineSizes.length) return;
+	SortedSet<Integer> lines = new TreeSet<>();
+	for (int i = startLine; i < endLine; i++) {
+		lines.add(Integer.valueOf(i));
+	}
+	reset(lines);
+}
+void reset(Set<Integer> lines) {
+	if (lines == null || lines.isEmpty()) return;
+	int resetLineCount = 0;
+	for (Integer line : lines) {
+		if (line >= 0 || line < lineCount) {
+			resetLineCount++;
+			getLineSize(line.intValue()).resetSize();
+		}
+	}
+	if (lines.contains(Integer.valueOf(maxWidthLineIndex))) {
+		maxWidth = 0;
+		maxWidthLineIndex = -1;
+		if (resetLineCount != this.lineCount) {
+			for (int i = 0; i < this.lineCount; i++) {
+				LineSizeInfo lineSize = getLineSize(i);
+				if (lineSize.width > maxWidth) {
+					maxWidth = lineSize.width;
+					maxWidthLineIndex = i;
+				}
+			}
+		}
+	}
+}
+void setContent(StyledTextContent content) {
+	reset();
+	this.content = content;
+	lineCount = content.getLineCount();
+	lineSizes = new LineSizeInfo[lineCount];
+	maxWidth = 0;
+	maxWidthLineIndex = -1;
+	reset(0, lineCount);
+}
+void setFont(Font font, int tabs) {
+	TextLayout layout = new TextLayout(device);
+	layout.setFont(regularFont);
+	tabLength = tabs;
+	if (font != null) {
+		if (boldFont != null) boldFont.dispose();
+		if (italicFont != null) italicFont.dispose();
+		if (boldItalicFont != null) boldItalicFont.dispose();
+		boldFont = italicFont = boldItalicFont = null;
+		regularFont = font;
+		layout.setText("    ");
+		layout.setFont(font);
+		layout.setStyle(new TextStyle(getFont(SWT.NORMAL), null, null), 0, 0);
+		layout.setStyle(new TextStyle(getFont(SWT.BOLD), null, null), 1, 1);
+		layout.setStyle(new TextStyle(getFont(SWT.ITALIC), null, null), 2, 2);
+		layout.setStyle(new TextStyle(getFont(SWT.BOLD | SWT.ITALIC), null, null), 3, 3);
+		FontMetrics metrics = layout.getLineMetrics(0);
+		ascent = metrics.getAscent() + metrics.getLeading();
+		descent = metrics.getDescent();
+		boldFont.dispose();
+		italicFont.dispose();
+		boldItalicFont.dispose();
+		boldFont = italicFont = boldItalicFont = null;
+	}
+	layout.dispose();
+	layout = new TextLayout(device);
+	layout.setFont(regularFont);
+	StringBuilder tabBuffer = new StringBuilder(tabs);
+	for (int i = 0; i < tabs; i++) {
+		tabBuffer.append(' ');
+	}
+	layout.setText(tabBuffer.toString());
+	tabWidth = layout.getBounds().width;
+	layout.dispose();
+	if (styledText != null) {
+		GC gc = new GC(styledText);
+		averageCharWidth = (int) gc.getFontMetrics().getAverageCharacterWidth();
+		fixedPitch = gc.stringExtent("l").x == gc.stringExtent("W").x; //$NON-NLS-1$ //$NON-NLS-2$
+		gc.dispose();
+	}
+}
+void setLineAlignment(int startLine, int count, int alignment) {
+	if (lines == null) lines = new LineInfo[lineCount];
+	for (int i = startLine; i < startLine + count; i++) {
+		if (lines[i] == null) {
+			lines[i] = new LineInfo();
+		}
+		lines[i].flags |= ALIGNMENT;
+		lines[i].alignment = alignment;
+	}
+}
+void setLineBackground(int startLine, int count, Color background) {
+	if (lines == null) lines = new LineInfo[lineCount];
+	for (int i = startLine; i < startLine + count; i++) {
+		if (lines[i] == null) {
+			lines[i] = new LineInfo();
+		}
+		lines[i].flags |= BACKGROUND;
+		lines[i].background = background;
+	}
+}
+void setLineBullet(int startLine, int count, Bullet bullet) {
+	if (bulletsIndices != null) {
+		bulletsIndices = null;
+		bullets = null;
+	}
+	if (bullets == null) {
+		if (bullet == null) return;
+		bullets = new Bullet[1];
+		bullets[0] = bullet;
+	}
+	int index = 0;
+	while (index < bullets.length) {
+		if (bullet == bullets[index]) break;
+		index++;
+	}
+	if (bullet != null) {
+		if (index == bullets.length) {
+			Bullet[] newBulletsList = new Bullet[bullets.length + 1];
+			System.arraycopy(bullets, 0, newBulletsList, 0, bullets.length);
+			newBulletsList[index] = bullet;
+			bullets = newBulletsList;
+		}
+		bullet.addIndices(startLine, count);
+	} else {
+		updateBullets(startLine, count, 0, false);
+		styledText.redrawLinesBullet(redrawLines);
+		redrawLines = null;
+	}
+}
+void setLineIndent(int startLine, int count, int indent) {
+	if (lines == null) lines = new LineInfo[lineCount];
+	for (int i = startLine; i < startLine + count; i++) {
+		if (lines[i] == null) {
+			lines[i] = new LineInfo();
+		}
+		lines[i].flags |= INDENT;
+		lines[i].indent = indent;
+	}
+}
+void setLineVerticalIndent(int lineIndex, int verticalLineIndent) {
+	if (lines == null)
+		lines = new LineInfo[lineCount];
+	if (lines[lineIndex] == null) {
+		lines[lineIndex] = new LineInfo();
+	}
+	lines[lineIndex].flags |= VERTICAL_INDENT;
+	lines[lineIndex].verticalIndent = verticalLineIndent;
+}
+void setLineWrapIndent(int startLine, int count, int wrapIndent) {
+	if (lines == null) lines = new LineInfo[lineCount];
+	for (int i = startLine; i < startLine + count; i++) {
+		if (lines[i] == null) {
+			lines[i] = new LineInfo();
+		}
+		lines[i].flags |= WRAP_INDENT;
+		lines[i].wrapIndent = wrapIndent;
+	}
+}
+void setLineJustify(int startLine, int count, boolean justify) {
+	if (lines == null) lines = new LineInfo[lineCount];
+	for (int i = startLine; i < startLine + count; i++) {
+		if (lines[i] == null) {
+			lines[i] = new LineInfo();
+		}
+		lines[i].flags |= JUSTIFY;
+		lines[i].justify = justify;
+	}
+}
+void setLineSegments(int startLine, int count, int[] segments) {
+	if (lines == null) lines = new LineInfo[lineCount];
+	for (int i = startLine; i < startLine + count; i++) {
+		if (lines[i] == null) {
+			lines[i] = new LineInfo();
+		}
+		lines[i].flags |= SEGMENTS;
+		lines[i].segments = segments;
+	}
+}
+void setLineSegmentChars(int startLine, int count, char[] segmentChars) {
+	if (lines == null) lines = new LineInfo[lineCount];
+	for (int i = startLine; i < startLine + count; i++) {
+		if (lines[i] == null) {
+			lines[i] = new LineInfo();
+		}
+		lines[i].flags |= SEGMENT_CHARS;
+		lines[i].segmentsChars = segmentChars;
+	}
+}
+void setLineTabStops(int startLine, int count, int[] tabStops) {
+	if (lines == null) lines = new LineInfo[lineCount];
+	for (int i = startLine; i < startLine + count; i++) {
+		if (lines[i] == null) {
+			lines[i] = new LineInfo();
+		}
+		lines[i].flags |= TABSTOPS;
+		lines[i].tabStops = tabStops;
+	}
+}
+void setLineSpacingProvider(StyledTextLineSpacingProvider lineSpacingProvider) {
+	this.lineSpacingProvider = lineSpacingProvider;
+}
+void setStyleRanges (int[] newRanges, StyleRange[] newStyles) {
+	if (newStyles == null) {
+		stylesSetCount = styleCount = 0;
+		ranges = null;
+		styles = null;
+		stylesSet = null;
+		hasLinks = false;
+		return;
+	}
+	if (newRanges == null && COMPACT_STYLES) {
+		newRanges = new int[newStyles.length << 1];
+		StyleRange[] tmpStyles = new StyleRange[newStyles.length];
+		if (stylesSet == null) stylesSet = new StyleRange[4];
+		for (int i = 0, j = 0; i < newStyles.length; i++) {
+			StyleRange newStyle = newStyles[i];
+			newRanges[j++] = newStyle.start;
+			newRanges[j++] = newStyle.length;
+			int index = 0;
+			while (index < stylesSetCount) {
+				if (stylesSet[index].similarTo(newStyle)) break;
+				index++;
+			}
+			if (index == stylesSetCount) {
+				if (stylesSetCount == stylesSet.length) {
+					StyleRange[] tmpStylesSet = new StyleRange[stylesSetCount + 4];
+					System.arraycopy(stylesSet, 0, tmpStylesSet, 0, stylesSetCount);
+					stylesSet = tmpStylesSet;
+				}
+				stylesSet[stylesSetCount++] = newStyle;
+			}
+			tmpStyles[i] = stylesSet[index];
+		}
+		newStyles = tmpStyles;
+	}
+
+	if (styleCount == 0) {
+		if (newRanges != null) {
+			ranges = new int[newRanges.length];
+			System.arraycopy(newRanges, 0, ranges, 0, ranges.length);
+		}
+		styles = new StyleRange[newStyles.length];
+		System.arraycopy(newStyles, 0, styles, 0, styles.length);
+		styleCount = newStyles.length;
+		return;
+	}
+	if (newRanges != null && ranges == null) {
+		ranges = new int[styles.length << 1];
+		for (int i = 0, j = 0; i < styleCount; i++) {
+			ranges[j++] = styles[i].start;
+			ranges[j++] = styles[i].length;
+		}
+	}
+	if (newRanges == null && ranges != null) {
+		newRanges = new int[newStyles.length << 1];
+		for (int i = 0, j = 0; i < newStyles.length; i++) {
+			newRanges[j++] = newStyles[i].start;
+			newRanges[j++] = newStyles[i].length;
+		}
+	}
+	if (ranges != null) {
+		int rangeCount = styleCount << 1;
+		int start = newRanges[0];
+		int modifyStart = getRangeIndex(start, -1, rangeCount), modifyEnd;
+		boolean insert = modifyStart == rangeCount;
+		if (!insert) {
+			int end = newRanges[newRanges.length - 2] + newRanges[newRanges.length - 1];
+			modifyEnd = getRangeIndex(end, modifyStart - 1, rangeCount);
+			insert = modifyStart == modifyEnd && ranges[modifyStart] >= end;
+		}
+		if (insert) {
+			addMerge(newRanges, newStyles, newRanges.length, modifyStart, modifyStart);
+			return;
+		}
+		modifyEnd = modifyStart;
+		int[] mergeRanges = new int[6];
+		StyleRange[] mergeStyles = new StyleRange[3];
+		for (int i = 0; i < newRanges.length; i += 2) {
+			int newStart = newRanges[i];
+			int newEnd = newStart + newRanges[i + 1];
+			if (newStart == newEnd) continue;
+			int modifyLast = 0, mergeCount = 0;
+			while (modifyEnd < rangeCount) {
+				if (newStart >= ranges[modifyStart] + ranges[modifyStart + 1]) modifyStart += 2;
+				if (ranges[modifyEnd] + ranges[modifyEnd + 1] > newEnd) break;
+				modifyEnd += 2;
+			}
+			if (ranges[modifyStart] < newStart && newStart < ranges[modifyStart] + ranges[modifyStart + 1]) {
+				mergeStyles[mergeCount >> 1] = styles[modifyStart >> 1];
+				mergeRanges[mergeCount] = ranges[modifyStart];
+				mergeRanges[mergeCount + 1] = newStart - ranges[modifyStart];
+				mergeCount += 2;
+			}
+			mergeStyles[mergeCount >> 1] = newStyles[i >> 1];
+			mergeRanges[mergeCount] = newStart;
+			mergeRanges[mergeCount + 1] = newRanges[i + 1];
+			mergeCount += 2;
+			if (modifyEnd < rangeCount && ranges[modifyEnd] < newEnd && newEnd < ranges[modifyEnd] + ranges[modifyEnd + 1]) {
+				mergeStyles[mergeCount >> 1] = styles[modifyEnd >> 1];
+				mergeRanges[mergeCount] = newEnd;
+				mergeRanges[mergeCount + 1] = ranges[modifyEnd] + ranges[modifyEnd + 1] - newEnd;
+				mergeCount += 2;
+				modifyLast = 2;
+			}
+			int grow = addMerge(mergeRanges, mergeStyles, mergeCount, modifyStart, modifyEnd + modifyLast);
+			rangeCount += grow;
+			modifyStart = modifyEnd += grow;
+		}
+	} else {
+		int start = newStyles[0].start;
+		int modifyStart = getRangeIndex(start, -1, styleCount), modifyEnd;
+		boolean insert = modifyStart == styleCount;
+		if (!insert) {
+			int end = newStyles[newStyles.length - 1].start + newStyles[newStyles.length - 1].length;
+			modifyEnd = getRangeIndex(end, modifyStart - 1, styleCount);
+			insert = modifyStart == modifyEnd && styles[modifyStart].start >= end;
+		}
+		if (insert) {
+			addMerge(newStyles, newStyles.length, modifyStart, modifyStart);
+			return;
+		}
+		modifyEnd = modifyStart;
+		StyleRange[] mergeStyles = new StyleRange[3];
+		for (int i = 0; i < newStyles.length; i++) {
+			StyleRange newStyle = newStyles[i], style;
+			int newStart = newStyle.start;
+			int newEnd = newStart + newStyle.length;
+			if (newStart == newEnd) continue;
+			int modifyLast = 0, mergeCount = 0;
+			while (modifyEnd < styleCount) {
+				if (newStart >= styles[modifyStart].start + styles[modifyStart].length) modifyStart++;
+				if (styles[modifyEnd].start + styles[modifyEnd].length > newEnd) break;
+				modifyEnd++;
+			}
+			style = styles[modifyStart];
+			if (style.start < newStart && newStart < style.start + style.length) {
+				style = mergeStyles[mergeCount++] = (StyleRange)style.clone();
+				style.length = newStart - style.start;
+			}
+			mergeStyles[mergeCount++] = newStyle;
+			if (modifyEnd < styleCount) {
+				style = styles[modifyEnd];
+				if (style.start < newEnd && newEnd < style.start + style.length) {
+					style = mergeStyles[mergeCount++] = (StyleRange)style.clone();
+					style.length += style.start - newEnd;
+					style.start = newEnd;
+					modifyLast = 1;
+				}
+			}
+			int grow = addMerge(mergeStyles, mergeCount, modifyStart, modifyEnd + modifyLast);
+			modifyStart = modifyEnd += grow;
+		}
+	}
+}
+void textChanging(TextChangingEvent event) {
+	int start = event.start;
+	int newCharCount = event.newCharCount, replaceCharCount = event.replaceCharCount;
+	int newLineCount = event.newLineCount, replaceLineCount = event.replaceLineCount;
+
+	updateRanges(start, replaceCharCount, newCharCount);
+
+	int startLine = content.getLineAtOffset(start);
+	if (replaceCharCount == content.getCharCount()) lines = null;
+	if (replaceLineCount == lineCount) {
+		lineCount = newLineCount;
+		lineSizes = new LineSizeInfo[lineCount];
+		reset(0, lineCount);
+	} else {
+		int startIndex = startLine + replaceLineCount + 1;
+		int endIndex = startLine + newLineCount + 1;
+		if(lineCount < startLine) {
+			SWT.error(SWT.ERROR_INVALID_RANGE, null, "bug 478020: lineCount < startLine: " + lineCount + ":" + startLine);
+		}
+		if(lineCount < startIndex) {
+			SWT.error(SWT.ERROR_INVALID_RANGE, null, "bug 478020: lineCount < startIndex: " + lineCount + ":" + startIndex);
+		}
+		int delta = newLineCount - replaceLineCount;
+		if (lineCount + delta > lineSizes.length) {
+			LineSizeInfo[] newLineSizes = new LineSizeInfo[lineCount + delta + GROW];
+			System.arraycopy(lineSizes, 0, newLineSizes, 0, lineCount);
+			lineSizes = newLineSizes;
+		}
+		if (lines != null) {
+			if (lineCount + delta > lines.length) {
+				LineInfo[] newLines = new LineInfo[lineCount + delta + GROW];
+				System.arraycopy(lines, 0, newLines, 0, lineCount);
+				lines = newLines;
+			}
+		}
+		System.arraycopy(lineSizes, startIndex, lineSizes, endIndex, lineCount - startIndex);
+		for (int i = startLine; i < endIndex; i++) {
+			lineSizes[i] = null;
+		}
+		for (int i = lineCount + delta; i < lineCount; i++) {
+			lineSizes[i] = null;
+		}
+		if (layouts != null) {
+			int layoutStartLine = startLine - topIndex;
+			int layoutEndLine = layoutStartLine + replaceLineCount + 1;
+			for (int i = layoutStartLine; i < layoutEndLine; i++) {
+				if (0 <= i && i < layouts.length) {
+					if (layouts[i] != null) layouts[i].dispose();
+					layouts[i] = null;
+					if (bullets != null && bulletsIndices != null) bullets[i] = null;
+				}
+			}
+			if (delta > 0) {
+				for (int i = layouts.length - 1; i >= layoutEndLine; i--) {
+					if (0 <= i && i < layouts.length) {
+						endIndex = i + delta;
+						if (0 <= endIndex && endIndex < layouts.length) {
+							layouts[endIndex] = layouts[i];
+							layouts[i] = null;
+							if (bullets != null && bulletsIndices != null) {
+								bullets[endIndex] = bullets[i];
+								bulletsIndices[endIndex] = bulletsIndices[i];
+								bullets[i] = null;
+							}
+						} else {
+							if (layouts[i] != null) layouts[i].dispose();
+							layouts[i] = null;
+							if (bullets != null && bulletsIndices != null) bullets[i] = null;
+						}
+					}
+				}
+			} else if (delta < 0) {
+				for (int i = layoutEndLine; i < layouts.length; i++) {
+					if (0 <= i && i < layouts.length) {
+						endIndex = i + delta;
+						if (0 <= endIndex && endIndex < layouts.length) {
+							layouts[endIndex] = layouts[i];
+							layouts[i] = null;
+							if (bullets != null && bulletsIndices != null) {
+								bullets[endIndex] = bullets[i];
+								bulletsIndices[endIndex] = bulletsIndices[i];
+								bullets[i] = null;
+							}
+						} else {
+							if (layouts[i] != null) layouts[i].dispose();
+							layouts[i] = null;
+							if (bullets != null && bulletsIndices != null) bullets[i] = null;
+						}
+					}
+				}
+			}
+		}
+		if (replaceLineCount != 0 || newLineCount != 0) {
+			int startLineOffset = content.getOffsetAtLine(startLine);
+			if (startLineOffset != start) startLine++;
+			updateBullets(startLine, replaceLineCount, newLineCount, true);
+			if (lines != null) {
+				startIndex = startLine + replaceLineCount;
+				endIndex = startLine + newLineCount;
+				System.arraycopy(lines, startIndex, lines, endIndex, lineCount - startIndex);
+				for (int i = startLine; i < endIndex; i++) {
+					lines[i] = null;
+				}
+				for (int i = lineCount + delta; i < lineCount; i++) {
+					lines[i] = null;
+				}
+			}
+		}
+		lineCount += delta;
+		if (maxWidthLineIndex != -1 && startLine <= maxWidthLineIndex && maxWidthLineIndex <= startLine + replaceLineCount) {
+			maxWidth = 0;
+			maxWidthLineIndex = -1;
+			for (int i = 0; i < lineCount; i++) {
+				LineSizeInfo lineSize = getLineSize(i);
+				if (lineSize.width > maxWidth) {
+					maxWidth = lineSize.width;
+					maxWidthLineIndex = i;
+				}
+			}
+		}
+	}
+}
+void updateBullets(int startLine, int replaceLineCount, int newLineCount, boolean update) {
+	if (bullets == null) return;
+	if (bulletsIndices != null) return;
+	for (int i = 0; i < bullets.length; i++) {
+		Bullet bullet = bullets[i];
+		int[] lines = bullet.removeIndices(startLine, replaceLineCount, newLineCount, update);
+		if (lines != null) {
+			if (redrawLines == null) {
+				redrawLines = lines;
+			} else {
+				int[] newRedrawBullets = new int[redrawLines.length + lines.length];
+				System.arraycopy(redrawLines, 0, newRedrawBullets, 0, redrawLines.length);
+				System.arraycopy(lines, 0, newRedrawBullets, redrawLines.length, lines.length);
+				redrawLines = newRedrawBullets;
+			}
+		}
+	}
+	int removed = 0;
+	for (int i = 0; i < bullets.length; i++) {
+		if (bullets[i].size() == 0) removed++;
+	}
+	if (removed > 0) {
+		if (removed == bullets.length) {
+			bullets = null;
+		} else {
+			Bullet[] newBulletsList = new Bullet[bullets.length - removed];
+			for (int i = 0, j = 0; i < bullets.length; i++) {
+				Bullet bullet = bullets[i];
+				if (bullet.size() > 0) newBulletsList[j++] = bullet;
+			}
+			bullets = newBulletsList;
+		}
+	}
+}
+void updateRanges(int start, int replaceCharCount, int newCharCount) {
+	if (styleCount == 0 || (replaceCharCount == 0 && newCharCount == 0)) return;
+	if (ranges != null) {
+		int rangeCount = styleCount << 1;
+		int modifyStart = getRangeIndex(start, -1, rangeCount);
+		if (modifyStart == rangeCount) return;
+		int end = start + replaceCharCount;
+		int modifyEnd = getRangeIndex(end, modifyStart - 1, rangeCount);
+		int offset = newCharCount - replaceCharCount;
+		if (modifyStart == modifyEnd && ranges[modifyStart] < start && end < ranges[modifyEnd] + ranges[modifyEnd + 1]) {
+			if (newCharCount == 0) {
+				ranges[modifyStart + 1] -= replaceCharCount;
+				modifyEnd += 2;
+			} else {
+				if (rangeCount + 2 > ranges.length) {
+					int[] newRanges = new int[ranges.length + (GROW << 1)];
+					System.arraycopy(ranges, 0, newRanges, 0, rangeCount);
+					ranges = newRanges;
+					StyleRange[] newStyles = new StyleRange[styles.length + GROW];
+					System.arraycopy(styles, 0, newStyles, 0, styleCount);
+					styles = newStyles;
+				}
+				System.arraycopy(ranges, modifyStart + 2, ranges, modifyStart + 4, rangeCount - (modifyStart + 2));
+				System.arraycopy(styles, (modifyStart + 2) >> 1, styles, (modifyStart + 4) >> 1, styleCount - ((modifyStart + 2) >> 1));
+				ranges[modifyStart + 3] = ranges[modifyStart] + ranges[modifyStart + 1] - end;
+				ranges[modifyStart + 2] = start + newCharCount;
+				ranges[modifyStart + 1] = start - ranges[modifyStart];
+				styles[(modifyStart >> 1) + 1] = styles[modifyStart >> 1];
+				rangeCount += 2;
+				styleCount++;
+				modifyEnd += 4;
+			}
+			if (offset != 0) {
+				for (int i = modifyEnd; i < rangeCount; i += 2) {
+					ranges[i] += offset;
+				}
+			}
+		} else {
+			if (ranges[modifyStart] < start && start < ranges[modifyStart] + ranges[modifyStart + 1]) {
+				ranges[modifyStart + 1] = start - ranges[modifyStart];
+				modifyStart += 2;
+			}
+			if (modifyEnd < rangeCount && ranges[modifyEnd] < end && end < ranges[modifyEnd] + ranges[modifyEnd + 1]) {
+				ranges[modifyEnd + 1] = ranges[modifyEnd] + ranges[modifyEnd + 1] - end;
+				ranges[modifyEnd] = end;
+			}
+			if (offset != 0) {
+				for (int i = modifyEnd; i < rangeCount; i += 2) {
+					ranges[i] += offset;
+				}
+			}
+			System.arraycopy(ranges, modifyEnd, ranges, modifyStart, rangeCount - modifyEnd);
+			System.arraycopy(styles, modifyEnd >> 1, styles, modifyStart >> 1, styleCount - (modifyEnd >> 1));
+			styleCount -= (modifyEnd - modifyStart) >> 1;
+		}
+	} else {
+		int modifyStart = getRangeIndex(start, -1, styleCount);
+		if (modifyStart == styleCount) return;
+		int end = start + replaceCharCount;
+		int modifyEnd = getRangeIndex(end, modifyStart - 1, styleCount);
+		int offset = newCharCount - replaceCharCount;
+		if (modifyStart == modifyEnd && styles[modifyStart].start < start && end < styles[modifyEnd].start + styles[modifyEnd].length) {
+			if (newCharCount == 0) {
+				styles[modifyStart].length -= replaceCharCount;
+				modifyEnd++;
+			} else {
+				if (styleCount + 1 > styles.length) {
+					StyleRange[] newStyles = new StyleRange[styles.length + GROW];
+					System.arraycopy(styles, 0, newStyles, 0, styleCount);
+					styles = newStyles;
+				}
+				System.arraycopy(styles, modifyStart + 1, styles, modifyStart + 2, styleCount - (modifyStart + 1));
+				styles[modifyStart + 1] = (StyleRange)styles[modifyStart].clone();
+				styles[modifyStart + 1].length = styles[modifyStart].start + styles[modifyStart].length - end;
+				styles[modifyStart + 1].start = start + newCharCount;
+				styles[modifyStart].length = start - styles[modifyStart].start;
+				styleCount++;
+				modifyEnd += 2;
+			}
+			if (offset != 0) {
+				for (int i = modifyEnd; i < styleCount; i++) {
+					styles[i].start += offset;
+				}
+			}
+		} else {
+			if (styles[modifyStart].start < start && start < styles[modifyStart].start + styles[modifyStart].length) {
+				styles[modifyStart].length = start - styles[modifyStart].start;
+				modifyStart++;
+			}
+			if (modifyEnd < styleCount && styles[modifyEnd].start < end && end < styles[modifyEnd].start + styles[modifyEnd].length) {
+				styles[modifyEnd].length = styles[modifyEnd].start + styles[modifyEnd].length - end;
+				styles[modifyEnd].start = end;
+			}
+			if (offset != 0) {
+				for (int i = modifyEnd; i < styleCount; i++) {
+					styles[i].start += offset;
+				}
+			}
+			System.arraycopy(styles, modifyEnd, styles, modifyStart, styleCount - modifyEnd);
+			styleCount -= modifyEnd - modifyStart;
+		}
+	}
+}
+
+public boolean hasVerticalIndent() {
+	return Arrays.stream(lines).filter(Objects::nonNull) //
+			.mapToInt(line -> line.verticalIndent) //
+			.anyMatch(n -> n != 0);
+}
+
+
+}