bundles/core/org.eclipse.apogy.core.environment.orbit.earth.ui/src/org/eclipse/apogy/core/environment/orbit/earth/ui/composites/ConstantElevationMaskComposite.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 - initial API and implementation
 *
 * SPDX-License-Identifier: EPL-1.0
 *     
 *******************************************************************************/
package org.eclipse.apogy.core.environment.orbit.earth.ui.composites;

import java.text.DecimalFormat;

import org.eclipse.apogy.core.environment.orbit.earth.ApogyCoreEnvironmentOrbitEarthPackage;
import org.eclipse.apogy.core.environment.orbit.earth.ConstantElevationMask;
import org.eclipse.apogy.core.environment.ui.databindings.DegreeStringToRadiansConverter;
import org.eclipse.apogy.core.environment.ui.databindings.RadiansToDegreesStringConverter;
import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.UpdateValueStrategy;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.emf.databinding.EMFProperties;
import org.eclipse.emf.databinding.edit.EMFEditProperties;
import org.eclipse.emf.edit.domain.EditingDomain;
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 ConstantElevationMaskComposite extends Composite {
	public static final String DEGREE_STRING = "\u00b0";

	protected ConstantElevationMask constantElevationMask;
	protected DecimalFormat decimalFormat;

	private DataBindingContext m_bindingContext;

	private final Text elevationAngleText;

	private final EditingDomain editingDomain;
	private boolean enableEditing = true;

	public ConstantElevationMaskComposite(Composite parent, int style) {
		this(parent, style, null);
	}

	public ConstantElevationMaskComposite(Composite parent, int style, EditingDomain editingDomain) {
		super(parent, style);
		this.editingDomain = editingDomain;

		setLayout(new GridLayout(3, true));

		Label elevationLabel = new Label(this, SWT.NONE);
		elevationLabel.setText("Elevation Angle (deg)");
		elevationLabel.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));

		this.elevationAngleText = new Text(this, SWT.BORDER | SWT.SINGLE);
		this.elevationAngleText.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));

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

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

	public boolean isEnableEditing() {
		return this.enableEditing;
	}

	public void setEnableEditing(final boolean enableEditing) {
		this.enableEditing = enableEditing;

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

		// Sets the Editing propert of the text fields.
		getDisplay().asyncExec(new Runnable() {
			@Override
			public void run() {
				if (enableEditing) {
					ConstantElevationMaskComposite.this.elevationAngleText.setEditable(true);
				} else {
					ConstantElevationMaskComposite.this.elevationAngleText.setEditable(false);
				}
			}
		});

		if (this.constantElevationMask != null) {
			if (this.enableEditing) {
				this.m_bindingContext = custom_initDataBindings();
			} else {
				this.m_bindingContext = initDataBindingsNoEditing();
			}
		}
	}

	public ConstantElevationMask getConstantElevationMask() {
		return this.constantElevationMask;
	}

	public void setConstantElevationMask(ConstantElevationMask newGeographicCoordinates) {
		setConstantElevationMask(newGeographicCoordinates, true);
	}

	public void setConstantElevationMask(ConstantElevationMask newGeographicCoordinates, boolean update) {
		this.constantElevationMask = newGeographicCoordinates;
		if (update) {
			if (this.m_bindingContext != null) {
				this.m_bindingContext.dispose();
				this.m_bindingContext = null;
			}
			if (this.constantElevationMask != null) {
				if (this.enableEditing) {
					this.m_bindingContext = custom_initDataBindings();
				} else {
					this.m_bindingContext = initDataBindingsNoEditing();
				}
			}
		}
	}

	protected DecimalFormat getDecimalFormat() {
		if (this.decimalFormat == null) {
			this.decimalFormat = new DecimalFormat("0.0000000");
		}
		return this.decimalFormat;
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	protected DataBindingContext custom_initDataBindings() {
		DataBindingContext bindingContext = new DataBindingContext();

		//
		IObservableValue longitudeObserveWidget = WidgetProperties.text(SWT.FocusOut).observe(this.elevationAngleText);
		IObservableValue xObserveValue = (this.editingDomain == null
				? EMFProperties.value(
						ApogyCoreEnvironmentOrbitEarthPackage.Literals.CONSTANT_ELEVATION_MASK__CONSTANT_ELEVATION)
						.observe(this.constantElevationMask)
				: EMFEditProperties.value(this.editingDomain,
						ApogyCoreEnvironmentOrbitEarthPackage.Literals.CONSTANT_ELEVATION_MASK__CONSTANT_ELEVATION)
						.observe(this.constantElevationMask));

		UpdateValueStrategy strategy = new UpdateValueStrategy();
		strategy.setConverter(new DegreeStringToRadiansConverter());

		UpdateValueStrategy strategy_1 = new UpdateValueStrategy();
		strategy_1.setConverter(new RadiansToDegreesStringConverter(getDecimalFormat()));

		bindingContext.bindValue(longitudeObserveWidget, xObserveValue, strategy, strategy_1);

		//
		return bindingContext;
	}

	@SuppressWarnings({ "rawtypes", "unchecked" })
	protected DataBindingContext initDataBindingsNoEditing() {
		DataBindingContext bindingContext = new DataBindingContext();

		//
		IObservableValue xObserveWidget = WidgetProperties.text(SWT.FocusOut).observe(this.elevationAngleText);
		IObservableValue xObserveValue = (this.editingDomain == null
				? EMFProperties.value(
						ApogyCoreEnvironmentOrbitEarthPackage.Literals.CONSTANT_ELEVATION_MASK__CONSTANT_ELEVATION)
						.observe(this.constantElevationMask)
				: EMFEditProperties.value(this.editingDomain,
						ApogyCoreEnvironmentOrbitEarthPackage.Literals.CONSTANT_ELEVATION_MASK__CONSTANT_ELEVATION)
						.observe(this.constantElevationMask));

		UpdateValueStrategy strategy_1 = new UpdateValueStrategy();
		strategy_1.setConverter(new RadiansToDegreesStringConverter(getDecimalFormat()));

		bindingContext.bindValue(xObserveWidget, xObserveValue,
				new UpdateValueStrategy(UpdateValueStrategy.POLICY_NEVER), strategy_1);

		return bindingContext;
	}
}