/*******************************************************************************

 * Copyright (c) 2004, 2007 Mylyn project committers 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

 *******************************************************************************/

package org.eclipse.mylyn.wikitext.ui.viewer;

import org.eclipse.jface.text.Document;

import org.eclipse.jface.text.IDocument;

import org.eclipse.jface.text.source.IAnnotationModel;

import org.eclipse.jface.text.source.ISourceViewer;

import org.eclipse.jface.text.source.IVerticalRuler;

import org.eclipse.jface.text.source.SourceViewer;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.mylyn.internal.wikitext.ui.editor.MarkupEditor;

import org.eclipse.mylyn.internal.wikitext.ui.editor.MarkupSourceViewerConfiguration;

import org.eclipse.mylyn.internal.wikitext.ui.editor.syntax.FastMarkupPartitioner;

import org.eclipse.mylyn.wikitext.core.parser.markup.MarkupLanguage;

import org.eclipse.mylyn.wikitext.ui.WikiTextUiPlugin;

import org.eclipse.swt.SWT;

import org.eclipse.swt.custom.CTabFolder;

import org.eclipse.swt.custom.CTabItem;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.events.SelectionListener;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.ui.PlatformUI;

import org.eclipse.ui.swt.IFocusService;

/**

 * A multitab source viewer that can edit and preview wikitext markup

 * (lightweight markup languages)

 * 

 * @author Jingwen Ou

 */

public abstract class MultiSourceViewer extends SourceViewer {

	private CTabFolder folder;

	private MarkupLanguage markupLanguage;

	public MultiSourceViewer(Composite parent, IVerticalRuler ruler, int styles) {

		super(parent, ruler, styles);

	}

	private void configurePartitioning(IDocument document) {

		if (document != null) {

			FastMarkupPartitioner partitioner = new FastMarkupPartitioner();

			partitioner.setMarkupLanguage(markupLanguage);

			partitioner.connect(document);

			document.setDocumentPartitioner(partitioner);

		}

	}

	@Override

	public void createControl(Composite parent, int styles) {

		folder = new CTabFolder(parent, SWT.FLAT | SWT.BOTTOM);

		// wikitext markup editor

		{

			CTabItem viewerItem = new CTabItem(folder, SWT.NONE);

			viewerItem.setText("Source");

			viewerItem.setToolTipText("Edit Source");

			super.createControl(folder, styles);

			viewerItem.setControl(this.getTextWidget());

			folder.setSelection(viewerItem);

			MarkupSourceViewerConfiguration configuration = new MarkupSourceViewerConfiguration(

					WikiTextUiPlugin.getDefault().getPreferenceStore());

			configuration.setMarkupLanguage(markupLanguage);

			configure(configuration);

			IFocusService focusService = (IFocusService) PlatformUI

					.getWorkbench().getService(IFocusService.class);

			if (focusService != null) {

				focusService.addFocusTracker(getTextWidget(),

						MarkupEditor.EDITOR_SOURCE_VIEWER);

			}

			getTextWidget().setData(MarkupLanguage.class.getName(),

					markupLanguage);

			getTextWidget().setData(ISourceViewer.class.getName(), this);

		}

		// wikitext markup viewer

		{

			CTabItem previewItem = new CTabItem(folder, SWT.NONE);

			previewItem.setText("Preview");

			previewItem.setToolTipText("Preview Source");

			final SourceViewer previewViewer = createPreviewViewer(folder,

					styles);

			previewItem

					.setControl(previewViewer instanceof Viewer ? ((Viewer) previewViewer)

							.getControl()

							: previewViewer.getTextWidget());

			folder.addSelectionListener(new SelectionListener() {

				public void widgetDefaultSelected(SelectionEvent selectionevent) {

					widgetSelected(selectionevent);

				}

				public void widgetSelected(SelectionEvent selectionevent) {

					Document document = new Document(getDocument().get());

					previewViewer.setDocument(document);

				}

			});

		}

	}

	protected abstract SourceViewer createPreviewViewer(Composite parent,

			int style);

	public Control getParentControl() {

		return folder != null ? folder : this.getTextWidget().getParent();

	}

	@Override

	public void setDocument(IDocument document,

			IAnnotationModel annotationModel, int modelRangeOffset,

			int modelRangeLength) {

		configurePartitioning(document);

		super.setDocument(document, annotationModel, modelRangeOffset,

				modelRangeLength);

	}

	public MarkupLanguage getMarkupLanguage() {

		return markupLanguage;

	}

	public void setMarkupLanguage(MarkupLanguage markupLanguage) {

		this.markupLanguage = markupLanguage;

	}

}