tests/org.eclipse.ui.tests/Eclipse UI Tests/org/eclipse/ui/tests/SelectionProviderView.java

/*******************************************************************************
 * Copyright (c) 2000, 2017 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.tests;

import org.eclipse.core.runtime.ListenerList;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.IViewSite;
import org.eclipse.ui.PartInitException;
import org.eclipse.ui.part.ViewPart;

/**
 *  The view provides api to fire a selection event for its workbench page.
 */

public class SelectionProviderView extends ViewPart implements
		ISelectionProvider {
	public static final String ID = "org.eclipse.ui.tests.SelectionProviderView";

	public static final String ID_2 = "org.eclipse.ui.tests.SelectionProviderView2";

	private ListenerList<ISelectionChangedListener> selectionChangedListeners = new ListenerList<>();

	private ISelection lastSelection = StructuredSelection.EMPTY;

	private Text text;

	public SelectionProviderView() {
		super();
	}

	@Override
	public void setFocus() {
		text.setFocus();
	}

	@Override
	public void createPartControl(Composite parent) {
		text = new Text(parent, SWT.WRAP);
		text.setLayoutData(new GridData(GridData.FILL_BOTH));
	}

	@Override
	public void init(IViewSite site) throws PartInitException {
		site.setSelectionProvider(this);
		super.init(site);
	}

	@Override
	public void addSelectionChangedListener(ISelectionChangedListener listener) {
		selectionChangedListeners.add(listener);
	}

	@Override
	public ISelection getSelection() {
		return lastSelection;
	}

	@Override
	public void removeSelectionChangedListener(
			ISelectionChangedListener listener) {
		selectionChangedListeners.remove(listener);
	}

	/**
	 * Sets the selection to a particular object.
	 */
	public void setSelection(Object obj) {
		setSelection(new StructuredSelection(obj));
	}

	@Override
	public void setSelection(ISelection selection) {
		lastSelection = selection;

		// create an event
		SelectionChangedEvent event = new SelectionChangedEvent(this, selection);

		// write text
		text.setText(selection.toString());

		// fire the event
		Object[] listeners = selectionChangedListeners.getListeners();
		for (Object listener : listeners) {
			((ISelectionChangedListener) listener).selectionChanged(event);
		}
	}

	@Override
	public void dispose() {
		super.dispose(); // for debugging
	}
}