content: /**
   *  Copyright (c) 2013-2016 Angelo ZERR.
   *  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:
   *  Angelo Zerr <angelo.zerr@gmail.com> - initial API and implementation
   */
  package tern.eclipse.ide.internal.ui.descriptors.options;
  
  import org.eclipse.core.resources.IFolder;
  import org.eclipse.core.resources.IProject;
  import org.eclipse.core.resources.IResource;
  import org.eclipse.jface.fieldassist.ControlDecoration;
  import org.eclipse.jface.fieldassist.FieldDecorationRegistry;
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.events.ModifyEvent;
  import org.eclipse.swt.events.ModifyListener;
  import org.eclipse.swt.events.SelectionAdapter;
  import org.eclipse.swt.events.SelectionEvent;
  import org.eclipse.swt.graphics.Image;
  import org.eclipse.swt.layout.GridData;
  import org.eclipse.swt.layout.GridLayout;
  import org.eclipse.swt.widgets.Button;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Text;
  
  import tern.eclipse.ide.internal.ui.TernUIMessages;
  import tern.eclipse.ide.internal.ui.descriptors.TernModuleDescriptorManager;
  import tern.eclipse.ide.ui.descriptors.options.ITernModuleOptionFactory;
  import tern.eclipse.ide.ui.utils.DialogUtils;
  import tern.metadata.TernModuleMetadataOption;
  import tern.server.protocol.JsonHelper;
  import tern.utils.StringUtils;
  
  import com.eclipsesource.json.JsonObject;
  
  /**
   * Path tern module option.
   *
   */
  public class PathTernModuleOptionFactory implements ITernModuleOptionFactory {
  
  	@Override
  	public void createOption(Composite ancestor, final IProject project,
  			TernModuleMetadataOption metadata, final JsonObject options) {
  		final String name = metadata.getName();
  		if (project == null) {
  			TernModuleDescriptorManager
  					.getManager()
  					.getTernModuleOptionFactory(
  							StringTernModuleOptionFactory.ID)
  					.createOption(ancestor, project, metadata, options);
  			return;
  		}
  
  		final Composite parent = new Composite(ancestor, SWT.NONE);
  		parent.setLayout(new GridLayout(2, false));
  		parent.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
  
  		// create UI
  		final Text textField = new Text(parent, SWT.BORDER);
  		textField.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
  
  		// create the decoration for the text component
  		final ControlDecoration deco = new ControlDecoration(textField, SWT.TOP
  				| SWT.LEFT);
  		Image image = FieldDecorationRegistry.getDefault()
  				.getFieldDecoration(FieldDecorationRegistry.DEC_WARNING)
  				.getImage();
  
  		// set description and image
  		deco.setDescriptionText(TernUIMessages.PathTernModuleOptionFactory_validatePath);
  		deco.setImage(image);
  		deco.hide();
  
  		// Synchronize UI & JSON
  		textField.addModifyListener(new ModifyListener() {
  
  			@Override
  			public void modifyText(ModifyEvent e) {
  				String value = textField.getText();
  				if (StringUtils.isEmpty(value)) {
  					options.remove(name);
  				} else {
  					IFolder folder = project.getFolder(value);
  					if ((folder != null && folder.exists())) {
  						deco.hide();
  					} else {
  						deco.show();
  					}
  					options.set(name, value);
  				}
  
  			}
  		});
  
  		// init UI value
  		String initialValue = JsonHelper.getString(options.get(name));
  		textField.setText(initialValue != null ? initialValue : "");
  
  		Button pathButton = new Button(parent, SWT.PUSH);
  		pathButton.setText(TernUIMessages.Button_selectPath);
  		pathButton.addSelectionListener(new SelectionAdapter() {
  
  			@Override
  			public void widgetSelected(SelectionEvent e) {
  				IResource resource = DialogUtils.openFolderDialog(
  						textField.getText(), project, false, parent.getShell());
  				if (resource != null) {
  					String path = resource.getProjectRelativePath().toString();
  					textField.setText(path);
  				}
  			}
  
  		});
  	}
  
  }
  