bundles/addons/org.eclipse.apogy.addons.ros.ui/src/org/eclipse/apogy/addons/ros/ui/composites/ROSInterfaceListComposite.java

/*******************************************************************************
 * Copyright (c) 2018 Agence spatiale canadienne / Canadian Space Agency 
 * 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:
 *     Pierre Allard, 
 *     Regent L'Archeveque,
 *     Sebastien Gemme - initial API and implementation
 * SPDX-License-Identifier: EPL-1.0
 *     
 *******************************************************************************/
package org.eclipse.apogy.addons.ros.ui.composites;

import java.util.List;

import org.eclipse.apogy.addons.ros.ROSInterface;
import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
import org.eclipse.emf.edit.ui.provider.AdapterFactoryContentProvider;
import org.eclipse.emf.edit.ui.provider.AdapterFactoryLabelProvider;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Tree;

public class ROSInterfaceListComposite extends Composite {
	private EList<ROSInterface> rosInterfaceList;
	private ROSInterface selectedROSInterface = null;

	private Tree tree;
	private TreeViewer treeViewer;

	private final ComposedAdapterFactory adapterFactory = new ComposedAdapterFactory(
			ComposedAdapterFactory.Descriptor.Registry.INSTANCE);
	private DataBindingContext m_bindingContext;

	public ROSInterfaceListComposite(Composite parent, int style) {
		super(parent, style);
		setLayout(new GridLayout(1, false));

		this.treeViewer = new TreeViewer(this,
				SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL | SWT.FULL_SELECTION | SWT.MULTI);
		this.tree = this.treeViewer.getTree();
		GridData gd_tree = new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1);
		gd_tree.widthHint = 500;
		gd_tree.minimumWidth = 500;
		gd_tree.heightHint = 500;
		gd_tree.minimumHeight = 500;
		this.tree.setLayoutData(gd_tree);
		this.tree.setLinesVisible(true);

		this.treeViewer.setContentProvider(new AdapterFactoryContentProvider(this.adapterFactory) {
			@Override
			public Object[] getElements(Object inputElement) {
				if (inputElement instanceof List) {
					List<?> interfaceList = (List<?>) inputElement;
					return interfaceList.toArray();
				}

				return null;
			}

			@Override
			public Object[] getChildren(Object parentElement) {
				return null;
			}

			@Override
			public boolean hasChildren(Object object) {
				return false;
			}

		});
		this.treeViewer.setLabelProvider(new AdapterFactoryLabelProvider(this.adapterFactory));

		this.treeViewer.addSelectionChangedListener(new ISelectionChangedListener() {
			@Override
			public void selectionChanged(SelectionChangedEvent event) {
				ROSInterfaceListComposite.this.selectedROSInterface = (ROSInterface) ((IStructuredSelection) event
						.getSelection()).getFirstElement();
				newROSInterfaceSelected(ROSInterfaceListComposite.this.selectedROSInterface);
			}
		});

		this.addDisposeListener(new DisposeListener() {
			@Override
			public void widgetDisposed(DisposeEvent e) {
				if (ROSInterfaceListComposite.this.m_bindingContext != null)
					ROSInterfaceListComposite.this.m_bindingContext.dispose();
			}
		});
	}

	public EList<ROSInterface> getRosInterfaceList() {
		return this.rosInterfaceList;
	}

	public void setRosInterfaceList(EList<ROSInterface> rosInterfaceList) {
		if (this.m_bindingContext != null) {
			this.m_bindingContext.dispose();
		}

		this.rosInterfaceList = rosInterfaceList;

		if (rosInterfaceList != null) {
			this.m_bindingContext = customInitDataBindings();
			this.treeViewer.setInput(rosInterfaceList);

			// Selects the first EarthSurfaceWorksite found.
			this.selectedROSInterface = getFirstROSInterface(rosInterfaceList);
			if (this.selectedROSInterface != null)
				this.treeViewer.setSelection(new StructuredSelection(this.selectedROSInterface), true);
			newROSInterfaceSelected(this.selectedROSInterface);
		} else {
			this.treeViewer.setSelection(null, true);
			newROSInterfaceSelected(null);
		}
	}

	protected void newROSInterfaceSelected(ROSInterface rosInterface) {
	}

	protected DataBindingContext customInitDataBindings() {
		DataBindingContext bindingContext = new DataBindingContext();

		// IObservableValue<?> observeSingleSelectionViewer =
		// ViewerProperties.singleSelection().observe(treeViewer);

		return bindingContext;
	}

	protected ROSInterface getFirstROSInterface(EList<ROSInterface> rosInterfaceList) {
		if (!rosInterfaceList.isEmpty()) {
			return rosInterfaceList.get(0);
		} else {
			return null;
		}
	}
}