VariablesVirtualTreeModelViewer.java

/*******************************************************************************
 * Copyright (c) 2009, 2014 Wind River Systems 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:
 *     Wind River Systems - initial API and implementation
 *******************************************************************************/
package org.eclipse.tcf.debug.test;

import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputRequestor;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerInputUpdate;
import org.eclipse.debug.internal.ui.viewers.model.provisional.PresentationContext;
import org.eclipse.debug.internal.ui.viewers.model.provisional.ViewerInputService;
import org.eclipse.debug.internal.ui.viewers.model.provisional.VirtualTreeModelViewer;
import org.eclipse.debug.ui.contexts.DebugContextEvent;
import org.eclipse.debug.ui.contexts.IDebugContextListener;
import org.eclipse.debug.ui.contexts.IDebugContextProvider;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;

/**
 * 
 */
@SuppressWarnings("restriction")
public class VariablesVirtualTreeModelViewer extends VirtualTreeModelViewer implements IDebugContextListener {

    private IDebugContextProvider fDebugContextProvider;
    private ViewerInputService fInputService;
    private boolean fActive = false;

    public VariablesVirtualTreeModelViewer(String contextId, IDebugContextProvider debugContextProvider) {
        this(new PresentationContext(contextId), debugContextProvider);
    }

    public VariablesVirtualTreeModelViewer(IPresentationContext context, IDebugContextProvider debugContextProvider) {
        super(Display.getDefault(), SWT.NONE, context);
        fInputService = new ViewerInputService(this, new IViewerInputRequestor() {
            
            public void viewerInputComplete(IViewerInputUpdate update) {
                if (!update.isCanceled()) {
                    setInput(update.getInputElement());
                }
            }
        });
        fDebugContextProvider = debugContextProvider;
        debugContextProvider.addDebugContextListener(this);
    }

    public void setActive(boolean active) {
        if (fActive == active) {
            return;
        }
        fActive = active;
        if (fActive) {
            setActiveContext(fDebugContextProvider.getActiveContext());
        } else {
            fInputService.resolveViewerInput(ViewerInputService.NULL_INPUT);
        }
    }
    
    @Override
    public void dispose() {
        fDebugContextProvider.removeDebugContextListener(this);
        fInputService.dispose();
        super.dispose();
    }
    
    public void debugContextChanged(DebugContextEvent event) {
        if (fActive && (event.getFlags() & DebugContextEvent.ACTIVATED) != 0) {
            setActiveContext(event.getContext());
        }
    }    
    
    private void setActiveContext(ISelection selection) {
        if (selection instanceof IStructuredSelection) {
            fInputService.resolveViewerInput(((IStructuredSelection)selection).getFirstElement());
        }
    }
}