bundles/org.eclipse.ui.glance/src/org/eclipse/ui/glance/controls/text/styled/ListeningStyledTextSource.java

/*******************************************************************************
 * Copyright (c) 2017 Exyte
 * 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:
 *     Yuri Strot - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.glance.controls.text.styled;

import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextPresentation;
import org.eclipse.swt.custom.ExtendedModifyEvent;
import org.eclipse.swt.custom.LineStyleEvent;
import org.eclipse.swt.custom.LineStyleListener;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.ui.glance.internal.GlancePlugin;
import org.eclipse.ui.glance.sources.Match;
import org.eclipse.ui.glance.utils.TextUtils;

/**
 * @author Yuri Strot
 * 
 */
public class ListeningStyledTextSource extends AbstractStyledTextSource
		implements LineStyleListener {

	/**
	 * @param text
	 */
	public ListeningStyledTextSource(final StyledText text) {
		super(text);
		text.addLineStyleListener(this);
	}

	@Override
	protected void doDispose() {
		final StyledText text = getText();
		try {
			super.doDispose();
			try {
				text.removeLineStyleListener(this);
			} finally {
				refresh();
			}
		} catch (final Exception e) {
			GlancePlugin.log("Problems with '" + text.getClass() + "'", e);
		}
	}

	@Override
	protected StyledTextBlock createTextBlock() {
		return new StyledTextBlock(getText()) {
			@Override
			public void modifyText(final ExtendedModifyEvent event) {
				matches = Match.EMPTY;
				super.modifyText(event);
			}
		};
	}

    public void show(final Match[] matches) {
		this.matches = matches;
		refresh();
	}
	
	@Override
    public void select(final Match match){
	    super.select(match);
	    refresh();
	}

    public void lineGetStyle(final LineStyleEvent event) {
		if (matches.length > 0) {
			final int offset = event.lineOffset;
			final int length = event.lineText.length();

			int size = event.styles == null ? 0 : event.styles.length;
			if (size == 0)
				size = 1;
			final TextPresentation presentation = new TextPresentation(new Region(
					offset, length), size);
			if (event.styles != null && event.styles.length > 0)
				presentation.replaceStyleRanges(event.styles);
			applyTextPresentation(presentation);
			event.styles = TextUtils.getStyles(presentation);
		}
	}

	private void refresh() {
		final String text = getText().getText();
		getText().redrawRange(0, text.length(), false);
	}

	private void applyTextPresentation(final TextPresentation presentation) {
		TextUtils.applyStyles(presentation, matches, selected);
	}

	private Match[] matches = Match.EMPTY;
}