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.ui.wizards;
  
  import org.eclipse.core.runtime.IStatus;
  import org.eclipse.jface.wizard.WizardPage;
  import org.eclipse.wst.jsdt.internal.ui.dialogs.StatusInfo;
  import org.eclipse.wst.jsdt.internal.ui.dialogs.StatusUtil;
  
  /**
   * Base class for wizard page responsible to create JavaScript elements. The class
   * provides API to update the wizard's status line and OK button according to
   * the value of a <code>IStatus</code> object.
   * 
   * <p>
   * Clients may subclass.
   * </p>
   * 
   *
   * Provisional API: This class/interface is part of an interim API that is still under development and expected to
   * change significantly before reaching stability. It is being made available at this early stage to solicit feedback
   * from pioneering adopters on the understanding that any code that uses this API will almost certainly be broken
   * (repeatedly) as the API evolves. */
  public abstract class NewElementWizardPage extends WizardPage {
  
  	private IStatus fCurrStatus;
  	
  	private boolean fPageVisible;
  
  	/**
  	 * Creates a <code>NewElementWizardPage</code>.
  	 * 
  	 * @param name the wizard page's name
  	 */	
  	public NewElementWizardPage(String name) {
  		super(name);
  		fPageVisible= false;
  		fCurrStatus=  new StatusInfo();
  	}
  		
  	// ---- WizardPage ----------------
  	
  	/*
  	 * @see WizardPage#becomesVisible
  	 */
  	public void setVisible(boolean visible) {
  		super.setVisible(visible);
  		fPageVisible= visible;
  		// policy: wizards are not allowed to come up with an error message
  		if (visible && fCurrStatus.matches(IStatus.ERROR)) {
  			StatusInfo status= new StatusInfo();
  			status.setError("");  //$NON-NLS-1$
  			fCurrStatus= status;
  		} 
  		updateStatus(fCurrStatus);
  	}	
  
  	/**
  	 * Updates the status line and the OK button according to the given status
  	 * 
  	 * @param status status to apply
  	 */
  	protected void updateStatus(IStatus status) {
  		fCurrStatus= status;
  		setPageComplete(!status.matches(IStatus.ERROR));
  		if (fPageVisible) {
  			StatusUtil.applyToStatusLine(this, status);
  		}
  	}
  	
  	/**
  	 * Updates the status line and the OK button according to the status evaluate from
  	 * an array of status. The most severe error is taken.  In case that two status with 
  	 * the same severity exists, the status with lower index is taken.
  	 * 
  	 * @param status the array of status
  	 */
  	protected void updateStatus(IStatus[] status) {
  		updateStatus(StatusUtil.getMostSevere(status));
  	}	
  			
  }
  