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

import org.eclipse.apogy.common.emf.AbstractFeatureSpecifier;
import org.eclipse.apogy.common.emf.ApogyCommonEMFFacade;
import org.eclipse.apogy.common.emf.ApogyCommonEMFPackage;
import org.eclipse.apogy.common.emf.transaction.ApogyCommonTransactionFacade;
import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.UpdateValueStrategy;
import org.eclipse.core.databinding.conversion.Converter;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.emf.databinding.FeaturePath;
import org.eclipse.emf.databinding.edit.EMFEditProperties;
import org.eclipse.emf.ecore.EStructuralFeature;
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.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

public class AbstractFeatureSpecifierComposite extends Composite {
	private AbstractFeatureSpecifier abstractFeatureSpecifier;

	private final Text txtFeatureName;
	private final Text txtFeatureDescription;
	private final Text txtFeatureType;
	private final Text txtFeatureIndex;

	private DataBindingContext m_bindingContext;

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

		Label lblFeatureDetails = new Label(this, SWT.NONE);
		lblFeatureDetails.setText("Feature Details");
		GridData gd_lblFeatureDetails = new GridData(SWT.LEFT, SWT.CENTER, false, false, 2, 1);
		lblFeatureDetails.setLayoutData(gd_lblFeatureDetails);

		// Feature Name
		Label lblFeatureName = new Label(this, SWT.NONE);
		lblFeatureName.setText("Name : ");
		GridData gd_lblFeatureName = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
		lblFeatureName.setLayoutData(gd_lblFeatureName);

		this.txtFeatureName = new Text(this, SWT.NONE);
		this.txtFeatureName.setEditable(false);
		this.txtFeatureName.setText("");
		GridData gd_txtFeatureName = new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1);
		this.txtFeatureName.setLayoutData(gd_txtFeatureName);

		// Feature Description
		Label lblFeatureDescription = new Label(this, SWT.NONE);
		lblFeatureDescription.setText("Description : ");
		GridData gd_lblFeatureDescription = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
		lblFeatureDescription.setLayoutData(gd_lblFeatureDescription);

		this.txtFeatureDescription = new Text(this, SWT.NONE | SWT.V_SCROLL | SWT.H_SCROLL | SWT.MULTI);
		this.txtFeatureDescription.setEditable(false);
		this.txtFeatureDescription.setText("");
		GridData gd_txtFeatureDescription = new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1);
		gd_txtFeatureDescription.minimumHeight = 100;
		gd_txtFeatureDescription.heightHint = 100;
		this.txtFeatureDescription.setLayoutData(gd_txtFeatureDescription);

		// Feature Type
		Label lblFeatureType = new Label(this, SWT.NONE);
		lblFeatureType.setText("Type : ");
		GridData gd_lblFeatureType = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
		lblFeatureType.setLayoutData(gd_lblFeatureType);

		this.txtFeatureType = new Text(this, SWT.NONE);
		this.txtFeatureType.setEditable(false);
		this.txtFeatureType.setText("");
		this.txtFeatureType.setToolTipText("The type (class) of the feature value.");
		GridData gd_txtFeatureType = new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1);
		this.txtFeatureType.setLayoutData(gd_txtFeatureType);

		// Index
		Label lblFeatureIsMultiValued = new Label(this, SWT.NONE);
		lblFeatureIsMultiValued.setText("Index : ");
		GridData gd_lblFeatureIsMultiValued = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
		lblFeatureIsMultiValued.setLayoutData(gd_lblFeatureIsMultiValued);

		this.txtFeatureIndex = new Text(this, SWT.NONE);
		this.txtFeatureIndex.setEditable(false);
		this.txtFeatureIndex.setText("");
		this.txtFeatureIndex.setToolTipText("The index of the feature of interest if this feature is an array.");
		GridData gd_txtFeatureIndex = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
		gd_txtFeatureIndex.minimumWidth = 50;
		gd_txtFeatureIndex.widthHint = 50;
		this.txtFeatureIndex.setLayoutData(gd_txtFeatureIndex);

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

	public AbstractFeatureSpecifier getAbstractFeatureSpecifier() {
		return this.abstractFeatureSpecifier;
	}

	public void setAbstractFeatureSpecifier(AbstractFeatureSpecifier newAbstractFeatureSpecifier) {
		if (this.m_bindingContext != null)
			this.m_bindingContext.dispose();

		this.abstractFeatureSpecifier = newAbstractFeatureSpecifier;

		if (newAbstractFeatureSpecifier != null) {
			this.m_bindingContext = initDataBindingsCustom();
		}
	}

	@SuppressWarnings("unchecked")
	private DataBindingContext initDataBindingsCustom() {
		DataBindingContext bindingContext = new DataBindingContext();

		// Is Multi-Value class.
		IObservableValue<Boolean> observeFeatureMultiValue = EMFEditProperties
				.value(ApogyCommonTransactionFacade.INSTANCE.getDefaultEditingDomain(),
						FeaturePath.fromList(ApogyCommonEMFPackage.Literals.ABSTRACT_FEATURE_SPECIFIER__MULTI_VALUED))
				.observe(getAbstractFeatureSpecifier());

		/* Delete Button Enabled Binding. */
		IObservableValue<?> observeEnabledtxtFeatureIndexObserveWidget = WidgetProperties.enabled()
				.observe(this.txtFeatureIndex);
		bindingContext.bindValue(observeEnabledtxtFeatureIndexObserveWidget, observeFeatureMultiValue, null,
				new UpdateValueStrategy(UpdateValueStrategy.POLICY_UPDATE)
						.setConverter(new Converter(Object.class, Boolean.class) {
							@Override
							public Object convert(Object fromObject) {
								return fromObject != null;
							}
						}));

		EStructuralFeature eStructuralFeature = getAbstractFeatureSpecifier().getStructuralFeature();

		// Update displayed value.
		getDisplay().asyncExec(new Runnable() {
			@Override
			public void run() {
				AbstractFeatureSpecifierComposite.this.txtFeatureName.setText(eStructuralFeature.getName());
				AbstractFeatureSpecifierComposite.this.txtFeatureDescription
						.setText(ApogyCommonEMFFacade.INSTANCE.getFullDescription(eStructuralFeature));
				AbstractFeatureSpecifierComposite.this.txtFeatureType
						.setText(eStructuralFeature.getEType().getInstanceTypeName());
				AbstractFeatureSpecifierComposite.this.txtFeatureType
						.setToolTipText(eStructuralFeature.getEType().getInstanceTypeName());
				AbstractFeatureSpecifierComposite.this.txtFeatureIndex
						.setText(Integer.toString(getAbstractFeatureSpecifier().getIndex()));
			}
		});

		return bindingContext;
	}
}