content: /*******************************************************************************
   * Copyright (c) 2000, 2007 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.dialogfields;
  
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.layout.GridData;
  import org.eclipse.swt.widgets.Composite;
  import org.eclipse.swt.widgets.Control;
  import org.eclipse.swt.widgets.Label;
  
  /**
   * Dialog field describing a separator.
   */
  public class Separator extends DialogField {
  	
  	private Label fSeparator;
  	private int fStyle;
  	
  	public Separator() {
  		this(SWT.NONE);
  	}	
  	
  	/**
  	 * @param style of the separator. See <code>Label</code> for possible
  	 * styles.
  	 */
  	public Separator(int style) {
  		super();
  		fStyle= style;
  	}
  			
  	// ------- layout helpers
  
  	/**
  	 * Creates the separator and fills it in a MGridLayout.
  	 * @param height The height of the separator
  	 */		
  	public Control[] doFillIntoGrid(Composite parent, int nColumns, int height) {
  		assertEnoughColumns(nColumns);
  		
  		Control separator= getSeparator(parent);
  		separator.setLayoutData(gridDataForSeperator(nColumns, height));
  		
  		return new Control[] { separator };
  	}
  
  	/*
  	 * @see DialogField#doFillIntoGrid
  	 */	
  	public Control[] doFillIntoGrid(Composite parent, int nColumns) {
  		return doFillIntoGrid(parent, nColumns, 4);
  	}
  
  	/*
  	 * @see DialogField#getNumberOfControls
  	 */	
  	public int getNumberOfControls() {
  		return 1;	
  	}
  	
  	protected static GridData gridDataForSeperator(int span, int height) {
  		GridData gd= new GridData();
  		gd.horizontalAlignment= GridData.FILL;
  		gd.verticalAlignment= GridData.BEGINNING;
  		gd.heightHint= height;		
  		gd.horizontalSpan= span;
  		return gd;
  	}
  	
  	// ------- ui creation	
  
  	/**
  	 * Creates or returns the created separator.
  	 * @param parent The parent composite or <code>null</code> if the widget has
  	 * already been created.
  	 */	
  	public Control getSeparator(Composite parent) {
  		if (fSeparator == null) {
  			assertCompositeNotNull(parent);
  			fSeparator= new Label(parent, fStyle);
  		}	
  		return fSeparator;
  	}
  
  }
  