subcoolbarmanager.java

jfa2ce 源码帮助开发人员更好的理解运用

/*******************************************************************************
 * Copyright (c) 2003, 2006 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.jface.action;

import org.eclipse.jface.util.Assert;

/**
 * A <code>SubCoolBarManager</code> monitors the additional and removal of 
 * items from a parent manager so that visibility of the entire set can be changed as a
 * unit.
 * 
 * @since 3.0
 */
public class SubCoolBarManager extends SubContributionManager implements
        ICoolBarManager {

    /**
     * Constructs a new manager.
     *
     * @param mgr the parent manager.  All contributions made to the 
     *      <code>SubCoolBarManager</code> are forwarded and appear in the
     *      parent manager.
     */
    public SubCoolBarManager(ICoolBarManager mgr) {
        super(mgr);
        Assert.isNotNull(mgr);
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.action.ICoolBarManager#add(org.eclipse.jface.action.IToolBarManager)
     */
    public void add(IToolBarManager toolBarManager) {
        Assert.isNotNull(toolBarManager);
        super.add(new ToolBarContributionItem(toolBarManager));
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.action.ICoolBarManager#getStyle()
     */
    public int getStyle() {
        // It is okay to cast down since we only accept coolBarManager objects in the
        // constructor
        return ((ICoolBarManager) getParent()).getStyle();
    }

    /**
     * Returns the parent cool bar manager that this sub-manager contributes to.
     * 
     * @return the parent cool bar manager 
     */
    protected final ICoolBarManager getParentCoolBarManager() {
        // Cast is ok because that's the only
        // thing we accept in the construtor.
        return (ICoolBarManager) getParent();
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.action.ICoolBarManager#isLayoutLocked()
     */
    public boolean getLockLayout() {
        return getParentCoolBarManager().getLockLayout();
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.action.ICoolBarManager#lockLayout(boolean)
     */
    public void setLockLayout(boolean value) {
    }

    /* (non-Javadoc)
     * SubCoolBarManagers do not have control of the global context menu.
     */
    public IMenuManager getContextMenuManager() {
        return null;
    }

    /* (non-Javadoc)
     * In SubCoolBarManager we do nothing.
     */
    public void setContextMenuManager(IMenuManager menuManager) {
        // do nothing
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.action.IContributionManager#update(boolean)
     */
    public void update(boolean force) {
        // This method is not governed by visibility.  The client may
        // call <code>setVisible</code> and then force an update.  At that
        // point we need to update the parent.
        getParentCoolBarManager().update(force);
    }

}