org.eclipse.e4.tools.emf.ui.internal.common.uistructure.UIViewer.java Source code

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Here is the source code for org.eclipse.e4.tools.emf.ui.internal.common.uistructure.UIViewer.java

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/*******************************************************************************
 * Copyright (c) 2011 BestSolution.at 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:
 *     Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation
 ******************************************************************************/
package org.eclipse.e4.tools.emf.ui.internal.common.uistructure;

import java.util.Collections;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.core.databinding.observable.value.IValueChangeListener;
import org.eclipse.core.databinding.observable.value.ValueChangeEvent;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.RegistryFactory;
import org.eclipse.e4.tools.emf.ui.common.IScriptingSupport;
import org.eclipse.e4.tools.emf.ui.internal.Messages;
import org.eclipse.e4.tools.emf.ui.internal.common.ControlHighlighter;
import org.eclipse.e4.tools.services.IResourcePool;
import org.eclipse.e4.ui.model.application.MApplicationElement;
import org.eclipse.e4.ui.model.internal.ModelUtils;
import org.eclipse.emf.databinding.EMFProperties;
import org.eclipse.emf.databinding.IEMFValueProperty;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IMenuListener;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.MenuManager;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;

public class UIViewer {
    public TreeViewer createViewer(Composite parent, EStructuralFeature feature, final IObservableValue master,
            IResourcePool resourcePool, final Messages messages) {
        final TreeViewer viewer = new TreeViewer(parent);
        viewer.setContentProvider(new WidgetContentProvider());
        viewer.setLabelProvider(new WidgetLabelProvider(resourcePool));
        IEMFValueProperty property = EMFProperties.value(feature);
        IObservableValue value = property.observeDetail(master);
        value.addValueChangeListener(new IValueChangeListener() {

            @Override
            public void handleValueChange(ValueChangeEvent event) {
                if (event.diff.getNewValue() != null) {
                    viewer.setInput(Collections.singleton(event.diff.getNewValue()));
                    viewer.expandToLevel(2);
                } else {
                    viewer.setInput(Collections.emptyList());
                }
            }
        });

        final MenuManager mgr = new MenuManager();
        mgr.setRemoveAllWhenShown(true);
        mgr.addMenuListener(new IMenuListener() {

            @Override
            public void menuAboutToShow(IMenuManager manager) {
                final Object o = ((IStructuredSelection) viewer.getSelection()).getFirstElement();
                if (o instanceof Control) {
                    manager.add(new Action(messages.ModelEditor_ShowControl) {
                        @Override
                        public void run() {
                            ControlHighlighter.show((Control) o);
                        }
                    });
                }

                IExtensionRegistry registry = RegistryFactory.getRegistry();
                IExtensionPoint extPoint = registry.getExtensionPoint("org.eclipse.e4.tools.emf.ui.scripting"); //$NON-NLS-1$
                final IConfigurationElement[] elements = extPoint.getConfigurationElements();

                final IStructuredSelection s = (IStructuredSelection) viewer.getSelection();

                if (elements.length > 0 && !s.isEmpty()) {
                    MenuManager scriptExecute = new MenuManager(messages.ModelEditor_Script);
                    manager.add(scriptExecute);
                    for (IConfigurationElement e : elements) {
                        final IConfigurationElement le = e;
                        scriptExecute.add(new Action(e.getAttribute("label")) { //$NON-NLS-1$
                            @Override
                            public void run() {
                                try {
                                    MApplicationElement o = (MApplicationElement) master.getValue();
                                    IScriptingSupport support = (IScriptingSupport) le
                                            .createExecutableExtension("class"); //$NON-NLS-1$
                                    support.openEditor(viewer.getControl().getShell(), s.getFirstElement(),
                                            ModelUtils.getContainingContext(o));
                                } catch (CoreException e) {
                                    // TODO Auto-generated catch block
                                    e.printStackTrace();
                                }
                            }
                        });
                    }
                }
            }
        });

        viewer.getControl().setMenu(mgr.createContextMenu(viewer.getControl()));

        return viewer;
    }
}