bundles/org.eclipse.ui.glance/src/org/eclipse/ui/glance/controls/text/styled/AbstractStyledTextSource.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.core.runtime.ListenerList;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Point;

import org.eclipse.ui.glance.sources.BaseTextSource;
import org.eclipse.ui.glance.sources.ITextBlock;
import org.eclipse.ui.glance.sources.ITextSourceListener;
import org.eclipse.ui.glance.sources.Match;
import org.eclipse.ui.glance.sources.SourceSelection;

/**
 * @author Yuri Strot
 * 
 */
public abstract class AbstractStyledTextSource extends BaseTextSource implements SelectionListener {

	public AbstractStyledTextSource(final StyledText text) {
		this.text = text;
		blocks = new StyledTextBlock[] { createTextBlock() };
		list = new ListenerList();
	}

	protected StyledTextBlock createTextBlock() {
		return new StyledTextBlock(text);
	}

	public final void dispose() {
		if (text != null && !text.isDisposed() && !disposed) {
			doDispose();
		}
		disposed = true;
	}

	protected void doDispose() {
		focusKeeper.dispose();
		text.removeSelectionListener(this);
	}

	public boolean isDisposed() {
		return disposed;
	}

	public ITextBlock[] getBlocks() {
		return blocks;
	}

	public void addTextSourceListener(final ITextSourceListener listener) {
		list.add(listener);
	}

	public void removeTextSourceListener(final ITextSourceListener listener) {
		list.remove(listener);
	}

	public void widgetDefaultSelected(final SelectionEvent e) {
		fireSelectionChanged();
	}

	public void widgetSelected(final SelectionEvent e) {
		fireSelectionChanged();
	}

	private void fireSelectionChanged() {
		final SourceSelection selection = getSelection();
		final Object[] objects = list.getListeners();
		for (final Object object : objects) {
			final ITextSourceListener listener = (ITextSourceListener) object;
			listener.selectionChanged(selection);
		}
	}

	public SourceSelection getSelection() {
		final Point point = text.getSelection();
		final SourceSelection selection = new SourceSelection(blocks[0], point.x, point.y - point.x);
		return selection;
	}

	public void select(final Match match) {
		this.selected = match;
		focusKeeper.setMatch(match);
	}

	protected StyledText getText() {
		return text;
	}

	@Override
	public void init() {
		focusKeeper = new StyledTextSelector(text);
		text.addSelectionListener(this);
	}

	private StyledTextSelector focusKeeper;
	private final StyledText text;

	private boolean disposed;
	private final ListenerList list;
	private final StyledTextBlock[] blocks;
	protected Match selected;
}