/*******************************************************************************
 * Copyright (c) 2000, 2006 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.erlide.ui.util;

import org.eclipse.core.resources.IContainer;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.dialogs.ElementTreeSelectionDialog;
import org.eclipse.ui.dialogs.NewFolderDialog;
import org.eclipse.ui.views.navigator.ResourceComparator;
import org.erlide.ui.editors.erl.IErlangHelpContextIds;

/**
  */
public class FolderSelectionDialog extends ElementTreeSelectionDialog implements
		ISelectionChangedListener {

	private Button fNewFolderButton;
	private IContainer fSelectedContainer;

	public FolderSelectionDialog(Shell parent, ILabelProvider labelProvider,
			ITreeContentProvider contentProvider) {
		super(parent, labelProvider, contentProvider);
		setComparator(new ResourceComparator(ResourceComparator.NAME));
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets
	 * .Composite)
	 */
	@Override
	protected Control createDialogArea(Composite parent) {
		Composite result = (Composite) super.createDialogArea(parent);

		getTreeViewer().addSelectionChangedListener(this);

		Button button = new Button(result, SWT.PUSH);
		button.setText("Create &New Folder...");
		button.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent event) {
				newFolderButtonPressed();
			}
		});
		button.setFont(parent.getFont());
		fNewFolderButton = button;

		applyDialogFont(result);

		PlatformUI.getWorkbench().getHelpSystem().setHelp(parent,
				IErlangHelpContextIds.BP_SELECT_DEFAULT_OUTPUT_FOLDER_DIALOG);

		return result;
	}

	private void updateNewFolderButtonState() {
		IStructuredSelection selection = (IStructuredSelection) getTreeViewer()
				.getSelection();
		fSelectedContainer = null;
		if (selection.size() == 1) {
			Object first = selection.getFirstElement();
			if (first instanceof IContainer) {
				fSelectedContainer = (IContainer) first;
			}
		}
		fNewFolderButton.setEnabled(fSelectedContainer != null);
	}

	protected void newFolderButtonPressed() {
		NewFolderDialog dialog = new NewFolderDialog(getShell(),
				fSelectedContainer);
		if (dialog.open() == Window.OK) {
			TreeViewer treeViewer = getTreeViewer();
			treeViewer.refresh(fSelectedContainer);
			Object createdFolder = dialog.getResult()[0];
			treeViewer.reveal(createdFolder);
			treeViewer.setSelection(new StructuredSelection(createdFolder));
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.viewers.ISelectionChangedListener#selectionChanged(
	 * org.eclipse.jface.viewers.SelectionChangedEvent)
	 */
	public void selectionChanged(SelectionChangedEvent event) {
		updateNewFolderButtonState();
	}

}
