content: /*******************************************************************************
   * Copyright (c) 2000, 2008 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.wst.jsdt.internal.ui.wizards.buildpaths;
  
  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.viewers.ViewerFilter;
  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.eclipse.wst.jsdt.internal.ui.IJavaHelpContextIds;
  import org.eclipse.wst.jsdt.internal.ui.wizards.NewWizardMessages;
  
  /**
    */
  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)
  	 */
  	protected Control createDialogArea(Composite parent) {
  		Composite result= (Composite)super.createDialogArea(parent);
  		
  		getTreeViewer().addSelectionChangedListener(this);
  		
  		Button button = new Button(result, SWT.PUSH);
  		button.setText(NewWizardMessages.FolderSelectionDialog_button); 
  		button.addSelectionListener(new SelectionAdapter() {
  			public void widgetSelected(SelectionEvent event) {
  				newFolderButtonPressed();
  			}
  		});
  		button.setFont(parent.getFont());
  		fNewFolderButton= button;
  		
  		applyDialogFont(result);
  
  		PlatformUI.getWorkbench().getHelpSystem().setHelp(parent, IJavaHelpContextIds.BP_SELECT_DEFAULT_OUTPUT_FOLDER_DIALOG);
  		
  		return result;
  	}
  
  	public void addFilter(ViewerFilter filter) {
  		super.addFilter(filter);
  	}
  
  	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) {
  			protected Control createContents(Composite parent) {
  				PlatformUI.getWorkbench().getHelpSystem().setHelp(parent, IJavaHelpContextIds.BP_CREATE_NEW_FOLDER);
  				return super.createContents(parent);
  			}
  		};
  		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();
  	}
  	
  
  
  }
  