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/*******************************************************************************
 * Copyright (c) 2010, 2012 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.e4.ui.workbench.renderers.swt;

import java.util.HashMap;
import javax.inject.Inject;
import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.ui.internal.workbench.swt.AbstractPartRenderer;
import org.eclipse.e4.ui.internal.workbench.swt.Policy;
import org.eclipse.e4.ui.internal.workbench.swt.WorkbenchSWTActivator;
import org.eclipse.e4.ui.model.application.ui.MContext;
import org.eclipse.e4.ui.model.application.ui.menu.MMenu;
import org.eclipse.e4.ui.model.application.ui.menu.MPopupMenu;
import org.eclipse.e4.ui.workbench.modeling.EModelService;
import org.eclipse.e4.ui.workbench.swt.factories.IRendererFactory;
import org.eclipse.jface.action.IMenuListener2;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.Widget;

/**
 * <code>MenuManagerShowProcessor</code> provides hooks for renderer processing
 * before and after the <code>MenuManager</code> calls out to its
 * <code>IMenuManagerListener2</code> for the <code>menuAboutToShow</code>
 * events.
 */
public class MenuManagerShowProcessor implements IMenuListener2 {

	private static void trace(String msg, Widget menu, MMenu menuModel) {
		WorkbenchSWTActivator.trace(Policy.MENUS, msg + ": " + menu + ": " //$NON-NLS-1$ //$NON-NLS-2$
				+ menuModel, null);
	}

	@Inject
	private EModelService modelService;

	@Inject
	private IRendererFactory rendererFactory;

	@Inject
	private MenuManagerRenderer renderer;

	private HashMap<Menu, Runnable> pendingCleanup = new HashMap<Menu, Runnable>();

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.action.IMenuListener#menuAboutToShow(org.eclipse.jface
	 * .action.IMenuManager)
	 */
	public void menuAboutToShow(IMenuManager manager) {
		if (!(manager instanceof MenuManager)) {
			return;
		}
		MenuManager menuManager = (MenuManager) manager;
		final MMenu menuModel = renderer.getMenuModel(menuManager);
		final Menu menu = menuManager.getMenu();
		if (menuModel != null && menuManager != null) {
			cleanUp(menu, menuModel, menuManager);
		}
		if (menuModel instanceof MPopupMenu) {
			showPopup(menu, (MPopupMenu) menuModel, menuManager);
		}
		AbstractPartRenderer obj = rendererFactory.getRenderer(menuModel,
				menu.getParent());
		if (!(obj instanceof MenuManagerRenderer)) {
			trace("Not the correct renderer: " + obj, menu, menuModel); //$NON-NLS-1$
			return;
		}
		MenuManagerRenderer renderer = (MenuManagerRenderer) obj;
		if (menuModel.getWidget() == null) {
			renderer.bindWidget(menuModel, menuManager.getMenu());
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.jface.action.IMenuListener2#menuAboutToHide(org.eclipse.jface
	 * .action.IMenuManager)
	 */
	public void menuAboutToHide(IMenuManager manager) {
		if (!(manager instanceof MenuManager)) {
			return;
		}
		MenuManager menuManager = (MenuManager) manager;
		final MMenu menuModel = renderer.getMenuModel(menuManager);
		final Menu menu = menuManager.getMenu();
		if (menuModel != null) {
			showMenu(menu, menuModel, menuManager);
		}
	}

	private void cleanUp(final Menu menu, MMenu menuModel,
			MenuManager menuManager) {
		trace("cleanUp", menu, null); //$NON-NLS-1$
		if (pendingCleanup.isEmpty()) {
			return;
		}
		Runnable cleanUp = pendingCleanup.remove(menu);
		if (cleanUp != null) {
			trace("cleanUp.run()", menu, null); //$NON-NLS-1$
			cleanUp.run();
		}
	}

	private void showPopup(final Menu menu, final MPopupMenu menuModel,
			MenuManager menuManager) {
		// System.err.println("showPopup: " + menuModel + "\n\t" + menu);
		// we need some context foolery here
		final IEclipseContext popupContext = menuModel.getContext();
		final IEclipseContext parentContext = popupContext.getParent();
		final IEclipseContext originalChild = parentContext.getActiveChild();
		popupContext.activate();
		popupContext.set(MenuManagerRendererFilter.TMP_ORIGINAL_CONTEXT,
				originalChild);
	}

	private void showMenu(final Menu menu, final MMenu menuModel,
			MenuManager menuManager) {

		final IEclipseContext evalContext;
		if (menuModel instanceof MContext) {
			evalContext = ((MContext) menuModel).getContext();
		} else {
			evalContext = modelService.getContainingContext(menuModel);
		}
		MenuManagerRendererFilter.updateElementVisibility(menuModel, renderer,
				menuManager, evalContext, 2, true);
	}

}

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