bundles/common/org.eclipse.apogy.common.topology.addons.dynamics.ui/src/org/eclipse/apogy/common/topology/addons/dynamics/ui/composites/PrismaticConstraintComposite.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.common.topology.addons.dynamics.ui.composites;

import org.eclipse.apogy.common.topology.addons.dynamics.ApogyCommonTopologyAddonsDynamicsPackage.Literals;
import org.eclipse.apogy.common.topology.addons.dynamics.ConstraintState;
import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.databinding.EMFProperties;
import org.eclipse.jface.databinding.swt.WidgetProperties;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;

public class PrismaticConstraintComposite extends Composite {

	private DataBindingContext m_bindingContext;
	private org.eclipse.apogy.common.topology.addons.dynamics.PrismaticConstraint prismaticConstraint;
	private final Button enabledButton;
	private final ConstraintStateComposite linearConstraintStateComposite;

	private Adapter constraintStatesAdapter;

	public PrismaticConstraintComposite(Composite parent, int style,
			org.eclipse.apogy.common.topology.addons.dynamics.PrismaticConstraint newPrismaticConstraint) {
		this(parent, style);
		setPrismaticConstraint(newPrismaticConstraint);
	}

	public PrismaticConstraintComposite(Composite parent, int style) {
		super(parent, style);
		setLayout(new GridLayout(2, false));

		new Label(this, SWT.NONE).setText("Enabled:");

		this.enabledButton = new Button(this, SWT.CHECK);
		this.enabledButton.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));

		Group grpCurrentLinearState = new Group(this, SWT.NONE);
		grpCurrentLinearState.setLayout(new FillLayout(SWT.HORIZONTAL));
		grpCurrentLinearState.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1));
		grpCurrentLinearState.setText("Current Linear State");

		this.linearConstraintStateComposite = new ConstraintStateComposite(grpCurrentLinearState, SWT.NONE);
		new Label(this, SWT.NONE);
		new Label(this, SWT.NONE);

		if (this.prismaticConstraint != null) {
			this.m_bindingContext = initDataBindings();
		}

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

	@Override
	protected void checkSubclass() {
		// Disable the check that prevents subclassing of SWT components
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	private DataBindingContext initDataBindings() {
		DataBindingContext bindingContext = new DataBindingContext();

		IObservableValue enabledObserveWidget = WidgetProperties.selection().observe(this.enabledButton);
		IObservableValue enabledObserveValue = EMFProperties.value(Literals.ABSTRACT_CONSTRAINT__ENABLED)
				.observe(this.prismaticConstraint);

		bindingContext.bindValue(enabledObserveWidget, enabledObserveValue, null, null);

		return bindingContext;
	}

	public org.eclipse.apogy.common.topology.addons.dynamics.PrismaticConstraint getPrismaticConstraint() {
		return this.prismaticConstraint;
	}

	public void setPrismaticConstraint(
			org.eclipse.apogy.common.topology.addons.dynamics.PrismaticConstraint newPrismaticConstraint) {
		// Unregister listener from previous PrismaticConstraint
		if (getPrismaticConstraint() != null) {
			getPrismaticConstraint().eAdapters().remove(getConstraintStatesAdapter());
		}

		setPrismaticConstraint(newPrismaticConstraint, true);

		if (newPrismaticConstraint != null) {
			// Register listener to the new PrismaticConstraint
			newPrismaticConstraint.eAdapters().add(getConstraintStatesAdapter());

			this.linearConstraintStateComposite.setConstraintState(newPrismaticConstraint.getLinearCurrentState());
		} else {
			this.linearConstraintStateComposite.setConstraintState(null);
		}
	}

	public void setPrismaticConstraint(
			org.eclipse.apogy.common.topology.addons.dynamics.PrismaticConstraint newPrismaticConstraint,
			boolean update) {
		this.prismaticConstraint = newPrismaticConstraint;
		if (update) {
			if (this.m_bindingContext != null) {
				this.m_bindingContext.dispose();
				this.m_bindingContext = null;
			}
			if (this.prismaticConstraint != null) {
				this.m_bindingContext = initDataBindings();
			} else {
				this.enabledButton.setSelection(false);
			}
		}
	}

	private Adapter getConstraintStatesAdapter() {
		if (this.constraintStatesAdapter == null) {
			this.constraintStatesAdapter = new AdapterImpl() {
				@Override
				public void notifyChanged(org.eclipse.emf.common.notify.Notification msg) {
					// If the angular current state has been changed.
					if (msg.getFeature() == Literals.PRISMATIC_CONSTRAINT__LINEAR_CURRENT_STATE) {
						PrismaticConstraintComposite.this.linearConstraintStateComposite
								.setConstraintState((ConstraintState) msg.getNewValue(), true);
					}
				};
			};
		}
		return this.constraintStatesAdapter;
	}
}