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.actions;
  
  import org.eclipse.jface.action.ContributionItem;
  import org.eclipse.jface.action.IAction;
  import org.eclipse.jface.action.IMenuManager;
  import org.eclipse.jface.action.Separator;
  import org.eclipse.jface.resource.ImageDescriptor;
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.events.SelectionAdapter;
  import org.eclipse.swt.events.SelectionEvent;
  import org.eclipse.swt.widgets.Menu;
  import org.eclipse.swt.widgets.MenuItem;
  import org.eclipse.ui.actions.ActionGroup;
  import org.eclipse.wst.jsdt.internal.ui.JavaScriptPlugin;
  
  /**
   * A MultiActionGroup will display a list of IActions in a menu by transforming them
   * into MenuItems. The list of labels given will be what is displayed in the ViewMenu for 
   * the corresponding action (the action at the same position in the action array).
   * The actions are currently implemented as state based
   * so that after an action is executed the label will have a selection check.
   * 
   * 
   */
  public class MultiActionGroup extends ActionGroup {
  	
  	public IAction[] NO_ACTIONS = new IAction[0];
  	
  	private IAction[] fActions; 
  	
  	private int fCurrentSelection;
  	private MenuItem[] fItems;
  
  	/**
  	 * Creates a new action group with a given set of actions.
  	 * 
  	 * @param actions			the actions for this multi group
  	 * @param currentSelection	decides which action is selected in the menu on start up.
  	 * 							Denotes the location in the actions array of the current
  	 * 							selected state. It cannot be null.
  	 */
  	public MultiActionGroup(IAction[] actions, int currentSelection) {
  		super();
  		setActions(actions, currentSelection);
  	}
  	
  	/**
  	 * Creates a new action group. Clients using this constructor must set the actions
  	 * immediately after creating the multi action group by calling {@link #setActions(IAction[], int)}.
  	 */
  	protected MultiActionGroup() {
  		super();
  	}
  	
  	/**
  	 * Sets the given actions.
  	 * 
  	 * @param actions			the actions for this multi group, at least one
  	 * @param currentSelection	decides which action is selected in the menu on start up.
  	 * 							Denotes the location in the actions array of the current
  	 * 							selected state. It cannot be null.
  	 */
  	protected final void setActions(IAction[] actions, int currentSelection) {
  		fCurrentSelection= currentSelection;
  		fActions = actions;
  	}
  
  	/**
  	 * Adds the actions to the given menu manager.
  	 */
  	protected void addActions(IMenuManager viewMenu) {
  
  		viewMenu.add(new Separator());
  		fItems= new MenuItem[fActions.length];
  
  		for (int i= 0; i < fActions.length; i++) {
  			final int j= i;
  
  			viewMenu.add(new ContributionItem() {
  
  				public void fill(Menu menu, int index) {
  					
  					int style= SWT.CHECK;
  					if ((fActions[j].getStyle() & IAction.AS_RADIO_BUTTON) != 0)
  						style= SWT.RADIO;
  					
  					MenuItem mi= new MenuItem(menu, style, index);
  					ImageDescriptor d= fActions[j].getImageDescriptor();
  					mi.setImage(JavaScriptPlugin.getImageDescriptorRegistry().get(d));
  					fItems[j]= mi;
  					mi.setText(fActions[j].getText());
  					mi.setSelection(fCurrentSelection == j);
  					mi.addSelectionListener(new SelectionAdapter() {
  
  						public void widgetSelected(SelectionEvent e) {
  							if (fCurrentSelection == j) {
  								fItems[fCurrentSelection].setSelection(true);
  								return;
  							}
  							fActions[j].run();
  
  							// Update checked state
  							fItems[fCurrentSelection].setSelection(false);
  							fCurrentSelection= j;
  							fItems[fCurrentSelection].setSelection(true);
  						}
  
  					});
  				}
  				public boolean isDynamic() {
  					return false;
  				}
  			});
  		}
  	}
  }
  