org.eclipse.swt.custom.Bullet Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of org.eclipse.swt.gtk.linux.aarch64 Show documentation
Standard Widget Toolkit for GTK on aarch64
The newest version!
/*******************************************************************************
 * Copyright (c) 2000, 2008 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
 *******************************************************************************/
package org.eclipse.swt.custom;

import org.eclipse.swt.*;

/**
 * Instances of this class represent bullets in the StyledText.
 * 
 * The hashCode() method in this class uses the values of the public
 * fields to compute the hash value. When storing instances of the
 * class in hashed collections, do not modify these fields after the
 * object has been inserted.
 * 
 * 
 * Application code does not need to explicitly release the
 * resources managed by each instance when those instances are no longer
 * required, and thus no dispose() method is provided.
 * 
 *
 * @see StyledText#setLineBullet(int, int, Bullet)
 * @see Sample code and further information
 *
 * @since 3.2
 */
public class Bullet {
	/**
	* The bullet type.  Possible values are:
	* 
	* ST.BULLET_DOT
	* ST.BULLET_NUMBER
	* ST.BULLET_LETTER_LOWER
	* ST.BULLET_LETTER_UPPER
	* ST.BULLET_TEXT
	* ST.BULLET_CUSTOM
	* 
	*/
	public int type;

	/**
	* The bullet style.
	*/
	public StyleRange style;

	/**
	* The bullet text.
	*/
	public String text;

	int[] linesIndices;
	int count;

/**
 * Create a new bullet with the specified style, and type ST.BULLET_DOT.
 * The style must have a glyph metrics set.
 *
 * @param style the style
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT when the style or the glyph metrics are null
 * 
 */
public Bullet(StyleRange style) {
	this(ST.BULLET_DOT, style);
}
/**
 * Create a new bullet the specified style and type.
 * The style must have a glyph metrics set.
 *
 * @param type the bullet type
 * @param style the style
 *
 * @exception IllegalArgumentException 
 *    ERROR_NULL_ARGUMENT when the style or the glyph metrics are null
 * 
 */
public Bullet(int type, StyleRange style) {
	if (style == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	if (style.metrics == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	this.type = type;
	this.style = style;
}
void addIndices (int startLine, int lineCount) {
	if (linesIndices == null) {
		linesIndices = new int[lineCount];
		count = lineCount;
		for (int i = 0; i < lineCount; i++) linesIndices[i] = startLine + i;
	} else {
		int modifyStart = 0;
		while (modifyStart < count) {
			if (startLine <= linesIndices[modifyStart]) break;
			modifyStart++;
		}
		int modifyEnd = modifyStart;
		while (modifyEnd < count) {
			if (startLine + lineCount <= linesIndices[modifyEnd]) break;
			modifyEnd++;
		}
		int newSize = modifyStart + lineCount + count - modifyEnd;
		if (newSize > linesIndices.length) {
			int[] newLinesIndices = new int[newSize];
			System.arraycopy(linesIndices, 0, newLinesIndices, 0, count);
			linesIndices = newLinesIndices;
		}
		System.arraycopy(linesIndices, modifyEnd, linesIndices, modifyStart + lineCount, count - modifyEnd);
		for (int i = 0; i < lineCount; i++) linesIndices[modifyStart + i] = startLine + i;
		count = newSize;
	}
}
int indexOf (int lineIndex) {
	for (int i = 0; i < count; i++) {
		if (linesIndices[i] == lineIndex) return i;
	}
	return -1;
}
@Override
public int hashCode() {
	return style.hashCode() ^ type;
}
int[] removeIndices (int startLine, int replaceLineCount, int newLineCount, boolean update) {
	if (count == 0) return null;
	if (startLine > linesIndices[count - 1]) return null;
	int endLine = startLine + replaceLineCount;
	int delta = newLineCount - replaceLineCount;
	for (int i = 0; i < count; i++) {
		int index = linesIndices[i];
		if (startLine <= index) {
			int j = i;
			while (j < count) {
				if (linesIndices[j] >= endLine) break;
				j++;
			}
			if (update) {
				for (int k = j; k < count; k++) linesIndices[k] += delta;
			}
			int[] redrawLines = new int[count - j];
			System.arraycopy(linesIndices, j, redrawLines, 0, count - j);
			System.arraycopy(linesIndices, j, linesIndices, i, count - j);
			count -= (j - i);
			return redrawLines;
		}
	}
	for (int i = 0; i < count; i++) linesIndices[i] += delta;
	return null;
}
int size() {
	return count;
}
}