bundles/common/org.eclipse.apogy.common.emf.ui/src/org/eclipse/apogy/common/emf/ui/composites/AvailableUnitsComposite.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,
 *     Olivier L. Larouche - initial API and implementation
 * SPDX-License-Identifier: EPL-1.0
 *     
 *******************************************************************************/
package org.eclipse.apogy.common.emf.ui.composites;

import javax.measure.unit.NonSI;
import javax.measure.unit.SI;
import javax.measure.unit.Unit;

import org.eclipse.swt.SWT;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.layout.RowData;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;

public class AvailableUnitsComposite extends Composite {
	private List list = null;
	private Label listTitle = null;

	public AvailableUnitsComposite(Composite parent, int style) {
		super(parent, style);

		RowLayout rowLayout = new RowLayout(SWT.VERTICAL);
		rowLayout.pack = true;
		rowLayout.fill = false;
		rowLayout.center = true;
		setLayout(rowLayout);

		this.listTitle = new Label(this, SWT.NONE);
		this.listTitle.setText("Available Units");
		RowData listTitleRowData = new RowData();
		listTitleRowData.height = 37;
		this.listTitle.setLayoutData(listTitleRowData);

		this.list = new List(this, SWT.BORDER | SWT.SINGLE | SWT.V_SCROLL);
		RowData listRowData = new RowData();
		listRowData.height = 150;
		this.list.setLayoutData(listRowData);
		populateList(this.list);
		this.list.pack();

		final Clipboard cb = new Clipboard(this.getDisplay());

		Menu menu = new Menu(parent.getShell(), SWT.POP_UP);
		this.list.setMenu(menu);
		MenuItem item = new MenuItem(menu, SWT.PUSH);
		item.setText("Copy Selection");
		item.addListener(SWT.Selection, new Listener() {
			@Override
			public void handleEvent(Event event) {
				String text = AvailableUnitsComposite.this.list
						.getItem(AvailableUnitsComposite.this.list.getSelectionIndex());
				TextTransfer textTransfer = TextTransfer.getInstance();
				cb.setContents(new Object[] { text }, new Transfer[] { textTransfer });
			}
		});
	}

	protected void populateList(List list) {
		// SI units.
		SI si = SI.getInstance();
		for (Unit<?> unit : si.getUnits()) {
			String unitsAsString = unit.toString();
			if (unitsAsString != null) {
				list.add(unitsAsString);
			}
		}

		// SI units.
		NonSI nonSi = NonSI.getInstance();
		for (Unit<?> unit : nonSi.getUnits()) {
			String unitsAsString = unit.toString();
			if (unitsAsString != null) {
				list.add(unitsAsString);
			}
		}
	}

}