/*******************************************************************************
 * Copyright (c) 2005 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.ui.internal.dialogs;

import org.eclipse.jface.viewers.DoubleClickEvent;
import org.eclipse.jface.viewers.IDoubleClickListener;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.IWorkbench;
import org.eclipse.ui.activities.ITriggerPoint;
import org.eclipse.ui.internal.IWorkbenchHelpContextIds;
import org.eclipse.ui.internal.WorkbenchMessages;
import org.eclipse.ui.internal.WorkbenchPlugin;
import org.eclipse.ui.internal.activities.ws.WorkbenchTriggerPoints;
import org.eclipse.ui.wizards.IWizardCategory;

/**
 * Wizard page class from which an export wizard is selected.
 * 
 * @since 3.2
 *
 */
public class ExportPage extends ImportExportPage {
	private static final String STORE_SELECTED_EXPORT_WIZARD_ID = DIALOG_SETTING_SECTION_NAME
		+ "STORE_SELECTED_EXPORT_WIZARD_ID"; //$NON-NLS-1$
	
	private static final String STORE_EXPANDED_EXPORT_CATEGORIES = DIALOG_SETTING_SECTION_NAME
		+ "STORE_EXPANDED_EXPORT_CATEGORIES";	//$NON-NLS-1$

	CategorizedWizardSelectionTree exportTree;
	
	/**
	 * Constructor for export wizard selection page.
	 * 
	 * @param aWorkbench
	 * @param currentSelection
	 */
	public ExportPage(IWorkbench aWorkbench,
			IStructuredSelection currentSelection) {
		super(aWorkbench, currentSelection);
	}
	
	protected void initialize() {
		workbench.getHelpSystem().setHelp(getControl(),
                IWorkbenchHelpContextIds.EXPORT_WIZARD_SELECTION_WIZARD_PAGE);
	}

	protected Composite createTreeViewer(Composite parent) {
		IWizardCategory root = WorkbenchPlugin.getDefault()
			.getExportWizardRegistry().getRootCategory();
		exportTree = new CategorizedWizardSelectionTree(
				root, WorkbenchMessages.ExportWizard_selectDestination);
		Composite exportComp = exportTree.createControl(parent);
		exportTree.getViewer().addSelectionChangedListener(new ISelectionChangedListener(){
			public void selectionChanged(SelectionChangedEvent event) {
				listSelectionChanged(event.getSelection());    	       			
			}
		});
		exportTree.getViewer().addDoubleClickListener(new IDoubleClickListener(){
	    	public void doubleClick(DoubleClickEvent event) {
	    		treeDoubleClicked(event);
	    	}
	    });
		setTreeViewer(exportTree.getViewer());
	    return exportComp;
	}
	
	public void saveWidgetValues(){
    	storeExpandedCategories(STORE_EXPANDED_EXPORT_CATEGORIES, exportTree.getViewer());
        storeSelectedCategoryAndWizard(STORE_SELECTED_EXPORT_WIZARD_ID, exportTree.getViewer()); 	
        super.saveWidgetValues();
	}
	
	protected void restoreWidgetValues(){
        IWizardCategory exportRoot = WorkbenchPlugin.getDefault().getExportWizardRegistry().getRootCategory();
        expandPreviouslyExpandedCategories(STORE_EXPANDED_EXPORT_CATEGORIES, exportRoot, exportTree.getViewer());
        selectPreviouslySelected(STORE_SELECTED_EXPORT_WIZARD_ID, exportRoot, exportTree.getViewer());       
        super.restoreWidgetValues();
	}
	
	protected ITriggerPoint getTriggerPoint(){
		return getWorkbench().getActivitySupport()
    		.getTriggerPointManager().getTriggerPoint(WorkbenchTriggerPoints.EXPORT_WIZARDS);
	}
	
	protected void updateMessage(){
		setMessage(WorkbenchMessages.ImportExportPage_chooseExportDestination); 
		super.updateMessage();
	}
}