content: /*******************************************************************************
   * Copyright (c) 2005, 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.preferences.formatter;
  
  import java.util.Map;
  
  import org.eclipse.jface.dialogs.IDialogSettings;
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.events.SelectionAdapter;
  import org.eclipse.swt.events.SelectionEvent;
  import org.eclipse.swt.layout.GridData;
  import org.eclipse.swt.widgets.Button;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  import org.eclipse.wst.jsdt.ui.JavaScriptUI;
  
  public abstract class FormatterTabPage extends ModifyDialogTabPage {
  	
  	private final static String SHOW_INVISIBLE_PREFERENCE_KEY= JavaScriptUI.ID_PLUGIN + ".formatter_page.show_invisible_characters"; //$NON-NLS-1$
  	
  	private JavaPreview fPreview;
  	private final IDialogSettings fDialogSettings;
  	private Button fShowInvisibleButton;
  
  	public FormatterTabPage(IModificationListener modifyListener, Map workingValues) {
  		super(modifyListener, workingValues);
  		
  		fDialogSettings= JavaScriptPlugin.getDefault().getDialogSettings();
  	}
  
  	protected Composite doCreatePreviewPane(Composite composite, int numColumns) {
  		
  		createLabel(numColumns - 1, composite, FormatterMessages.ModifyDialogTabPage_preview_label_text);  
  		
  		fShowInvisibleButton= new Button(composite, SWT.CHECK);
  		fShowInvisibleButton.setText(FormatterMessages.FormatterTabPage_ShowInvisibleCharacters_label);
  		fShowInvisibleButton.setLayoutData(new GridData(SWT.RIGHT, SWT.TOP, true, false));
  		fShowInvisibleButton.addSelectionListener(new SelectionAdapter() {
  			public void widgetSelected(SelectionEvent e) {
  				fPreview.showInvisibleCharacters(fShowInvisibleButton.getSelection());
  				fDialogSettings.put(SHOW_INVISIBLE_PREFERENCE_KEY, fShowInvisibleButton.getSelection());
  			}
  		});
  		fShowInvisibleButton.setSelection(isShowInvisible());
  		
  		fPreview= doCreateJavaPreview(composite);
  		fDefaultFocusManager.add(fPreview.getControl());
  		fPreview.showInvisibleCharacters(fShowInvisibleButton.getSelection());
  		
  		final GridData gd= createGridData(numColumns, GridData.FILL_BOTH, 0);
  		gd.widthHint= 0;
  		gd.heightHint=0;
  		fPreview.getControl().setLayoutData(gd);
  		
  		return composite;
  	}
  
  	private boolean isShowInvisible() {
  		return fDialogSettings.getBoolean(SHOW_INVISIBLE_PREFERENCE_KEY);
  	}
  	
  	protected void doUpdatePreview() {
  		boolean showInvisible= isShowInvisible();
  		fPreview.showInvisibleCharacters(showInvisible);
  		fShowInvisibleButton.setSelection(showInvisible);
  	}
  
  }
  