SimpleTextLayout.java

/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.draw2d.text;

import java.util.List;

import org.eclipse.swt.graphics.Font;

/**
 * @author hudsonr
 * @since 2.1
 */
public class SimpleTextLayout extends TextLayout {

private static final String[] DELIMITERS = {
    "\r\n", //$NON-NLS-1$
     "\n", //$NON-NLS-1$
     "\r"};//$NON-NLS-1$

private static int result;
private static int delimeterLength;

/**
 * Creates a new SimpleTextLayout with the given TextFlow
 * @param flow the TextFlow
 */
public SimpleTextLayout(TextFlow flow) {
    super (flow);
}

/**
 * @see org.eclipse.draw2d.text.FlowFigureLayout#layout()
 */
protected void layout() {
    TextFlow textFlow = (TextFlow)getFlowFigure();
    String text = textFlow.getText();
    List fragments = textFlow.getFragments();
    Font font = textFlow.getFont();
    TextFragmentBox fragment;
    int i = 0;
    int offset = 0;
    FlowUtilities flowUtilities = textFlow.getFlowUtilities();
    
    do {
        nextLineBreak(text, offset);
        fragment = getFragment(i++, fragments);
        fragment.length = result - offset;
        fragment.offset = offset;
        fragment.setWidth(-1);
        flowUtilities.setupFragment(fragment, font, text.substring(offset, result));
        getContext().addToCurrentLine(fragment);
        getContext().endLine();
        offset = result + delimeterLength;
    } while (offset < text.length());
    //Remove the remaining unused fragments.
    while (i < fragments.size())
        fragments.remove(i++);
}

private int nextLineBreak(String text, int offset) {
    result = text.length();
    delimeterLength = 0;
    int current;
    for (int i = 0; i < DELIMITERS.length; i++) {
        current = text.indexOf(DELIMITERS[i], offset);
        if (current != -1 && current < result) {
            result = current;
            delimeterLength = DELIMITERS[i].length();
        }
    }
    return result;
}

}