org.eclipse.emf.ecoretools.tabbedproperties/src/org/eclipse/emf/ecoretools/tabbedproperties/sections/AbstractFileChooserPropertySection.java

/***********************************************************************
 * Copyright (c) 2007 Anyware Technologies
 * 
 * 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:
 *    Anyware Technologies - initial API and implementation
 * 
 * $Id: AbstractFileChooserPropertySection.java,v 1.2 2008/12/04 14:58:21 dsciamma Exp $
 **********************************************************************/

package org.eclipse.emf.ecoretools.tabbedproperties.sections;

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.emf.ecoretools.tabbedproperties.internal.Messages;
import org.eclipse.emf.ecoretools.tabbedproperties.internal.TabbedPropertiesPlugin;
import org.eclipse.emf.ecoretools.tabbedproperties.sections.widgets.FileChooser;
import org.eclipse.emf.edit.command.SetCommand;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.views.properties.tabbed.ITabbedPropertyConstants;
import org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage;

/**
 * An abstract implementation of a section with a field using a FileChooser
 * composite (TextField with a browse Button).
 * 
 * <br>
 * creation : 3 avr. 07
 * 
 * @author <a href="mailto:mickael.gerard@anyware-tech.com">Mickael Gerard</a>
 */
public abstract class AbstractFileChooserPropertySection extends AbstractTabbedPropertySection {

	/**
	 * A boolean that store if refreshing is happening and no model
	 * modifications should be performed
	 */
	private boolean isRefreshing = false;

	/**
	 * The text + filechooser button
	 */
	private FileChooser fileChooser;

	/**
	 * The label for this section
	 */
	private CLabel labelText;

	/**
	 * Section composite. This composite can be return if client desire to
	 * implement other widgets in relation with the list represented by this
	 * instance.
	 */
	// private Composite sectionComposite;
	/**
	 * @see org.eclipse.ui.views.properties.tabbed.ISection#createControls(org.eclipse.swt.widgets.Composite,
	 *      org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage)
	 */
	public void createControls(Composite parent, TabbedPropertySheetPage aTabbedPropertySheetPage) {
		super.createControls(parent, aTabbedPropertySheetPage);
	}

	/**
	 * @see org.eclipse.emf.ecoretools.tabbedproperties.sections.AbstractTabbedPropertySection#createWidgets(org.eclipse.swt.widgets.Composite)
	 */
	protected void createWidgets(Composite composite) {
		labelText = getWidgetFactory().createCLabel(composite, getLabelText());

		fileChooser = new FileChooser(composite, getWidgetFactory(), SWT.NONE);
		fileChooser.setEditable(true);

		if (getFeature() != null) {
			fileChooser.setChangeable(getFeature().isChangeable());
		}

	}

	/**
	 * @see org.eclipse.emf.ecoretools.tabbedproperties.sections.AbstractTabbedPropertySection#setSectionData(org.eclipse.swt.widgets.Composite)
	 */
	protected void setSectionData(Composite composite) {
		FormData data = new FormData();
		data.left = new FormAttachment(0, 0);
		data.right = new FormAttachment(fileChooser, -ITabbedPropertyConstants.HSPACE);
		data.top = new FormAttachment(0, ITabbedPropertyConstants.VSPACE);
		labelText.setLayoutData(data);

		data = new FormData();
		data.left = new FormAttachment(0, getStandardLabelWidth(composite, new String[] { getLabelText() }));
		data.right = new FormAttachment(100, 0);
		data.top = new FormAttachment(labelText, 0, SWT.CENTER);
		fileChooser.setLayoutData(data);

	}

	/**
	 * Adds the listeners on the widgets
	 */
	protected void hookListeners() {
		fileChooser.addModifyListener(new ModifyListener() {

			public void modifyText(ModifyEvent e) {
				handleTextModified();
			}

		});
	}

	/**
	 * Handle the combo modified event.
	 */
	protected void handleTextModified() {
		if (!isRefreshing && getFeatureValue() != fileChooser.getSelection()) {
			List<IStatus> status = verifyFile();
			fileChooser.setStatus(status);
			if (status.isEmpty()) {
				EditingDomain editingDomain = getEditingDomain();
				if (getEObjectList().size() == 1) {
					/* apply the property change to single selected object */
					editingDomain.getCommandStack().execute(SetCommand.create(editingDomain, getEObject(), getFeature(), fileChooser.getSelection()));
				}
			}
		}
	}

	/**
	 * @see org.eclipse.ui.views.properties.tabbed.ISection#refresh()
	 */
	public void refresh() {
		isRefreshing = true;
		fileChooser.setChangeable(!isReadOnly());
		fileChooser.setSelection(getFeatureValue());
		isRefreshing = false;
	}

	/**
	 * @return the FileChooser
	 */
	protected FileChooser getFileChooser() {
		return fileChooser;
	}

	/**
	 * @return the isRefreshing
	 */
	protected boolean isRefreshing() {
		return isRefreshing;
	}

	/**
	 * Handler called to verify the file path on user text modification. By
	 * default it checks the file existence is the property checkFileExistence
	 * is set to true
	 * 
	 * @return true is the file matches
	 */
	protected List<IStatus> verifyFile() {
		List<IStatus> statusList = new ArrayList<IStatus>();
		if (isCheckFileExistence()) {
			String selection = fileChooser.getSelection();
			if (selection != null && !"".equals(selection)) { //$NON-NLS-1$
				File file = new File(selection);
				if (!file.exists()) {
					statusList.add(new Status(IStatus.ERROR, TabbedPropertiesPlugin.PLUGIN_ID, getLabelText() + Messages.AbstractFileChooserPropertySection_NotExist));
				}
				if (!file.isFile()) {
					statusList.add(new Status(IStatus.ERROR, TabbedPropertiesPlugin.PLUGIN_ID, getLabelText() + Messages.AbstractFileChooserPropertySection_NotADirectory));
				}
			} else if (cannotBeBlank()) {
				statusList.add(new Status(IStatus.ERROR, TabbedPropertiesPlugin.PLUGIN_ID, getLabelText() + Messages.AbstractFileChooserPropertySection_NotBlank));
			}
		}
		List<IStatus> emptyList = Collections.emptyList();
		return statusList.isEmpty() ? emptyList : statusList;
	}

	/**
	 * 
	 * @return true if the file must exist in the file system
	 */
	public boolean isCheckFileExistence() {
		return false;
	}

	/**
	 * @return true if the field is compulsory
	 */
	public boolean cannotBeBlank() {
		return false;
	}

	/**
	 * Get the current feature value of the selected model object.
	 * 
	 * @return the feature value to select in the ccombo.
	 */
	protected abstract String getFeatureValue();

}