bundles/common/org.eclipse.apogy.common.ui/src/org/eclipse/apogy/common/ui/composites/Color3fComposite.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.ui.composites;

import javax.vecmath.Color3f;

import org.eclipse.apogy.common.emf.transaction.ApogyCommonTransactionFacade;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.notify.impl.AdapterImpl;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.jface.preference.ColorFieldEditor;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Composite;

public class Color3fComposite extends Composite {
	private EObject owner = null;
	private EStructuralFeature feature = null;
	private Adapter adapter;

	private boolean enableEditing = true;

	private final ColorFieldEditor colorFieldEditor;

	public Color3fComposite(Composite parent, int style) {
		this(parent, style, "", true, null, null);
	}

	public Color3fComposite(Composite parent, int style, String label, boolean enableEditing, EObject owner,
			EStructuralFeature feature) {
		super(parent, style);
		this.enableEditing = enableEditing;
		this.owner = owner;
		this.feature = feature;

		this.colorFieldEditor = new ColorFieldEditor("Color", label, this);
		this.colorFieldEditor.setEnabled(this.enableEditing, this);
		this.colorFieldEditor.getColorSelector().addListener(new IPropertyChangeListener() {

			@Override
			public void propertyChange(PropertyChangeEvent event) {
				Color3f color = convert(Color3fComposite.this.colorFieldEditor.getColorSelector().getColorValue());
				ApogyCommonTransactionFacade.INSTANCE.basicSet(getOwner(), getFeature(), color);
			}
		});

		// Sets initial color
		if (getOwner() != null) {
			if (getFeature() != null) {
				// Update the color.
				Object value = getOwner().eGet(getFeature(), true);
				if (value instanceof Color3f) {
					updateDisplayedColor((Color3f) value);
				} else {
					updateDisplayedColor(null);
				}
			}
		}

		addDisposeListener(new DisposeListener() {

			@Override
			public void widgetDisposed(DisposeEvent e) {
				if (getOwner() != null) {
					getOwner().eAdapters().remove(getAdapter());
				}
			}
		});
	}

	public Color3f getSelectedColor() {
		if (this.colorFieldEditor != null) {
			return convert(this.colorFieldEditor.getColorSelector().getColorValue());
		} else {
			return null;
		}
	}

	public EObject getOwner() {
		return this.owner;
	}

	public void setOwner(EObject newOwner) {
		// Un-Register listener from past owner.
		if (this.owner != null) {
			this.owner.eAdapters().remove(getAdapter());
		}

		this.owner = newOwner;

		if (newOwner != null) {
			if (getFeature() != null) {
				// Update the color.
				Object value = newOwner.eGet(getFeature(), true);
				if (value instanceof Color3f) {
					updateDisplayedColor((Color3f) value);
				} else {
					updateDisplayedColor(null);
				}
			}
			// Register listener to the new owner.
			newOwner.eAdapters().add(getAdapter());
		}
	}

	public EStructuralFeature getFeature() {
		return this.feature;
	}

	public void setFeature(EStructuralFeature feature) {
		this.feature = feature;

		// Update displayed color.
		if (getOwner() != null && feature != null) {
			Object value = getOwner().eGet(getFeature(), true);
			if (value instanceof Color3f) {
				updateDisplayedColor((Color3f) value);
			} else {
				updateDisplayedColor(null);
			}
		} else {
			updateDisplayedColor(null);
		}
	}

	protected void newColorSelected(Color3f color) {
	}

	protected Color3f convert(org.eclipse.swt.graphics.RGB rgb) {
		Color3f color = new Color3f((rgb.red / 255.0f), (rgb.green / 255.0f), (rgb.blue / 255.0f));
		return color;
	}

	protected org.eclipse.swt.graphics.RGB convert(Color3f color) {
		if (color != null) {
			int red = Math.round(255.0f * (color.getX()));
			int green = Math.round(255.0f * (color.getY()));
			int blue = Math.round(255.0f * (color.getZ()));

			return new RGB(red, green, blue);
		} else {
			return new RGB(0, 0, 0);
		}
	}

	private void updateDisplayedColor(final Color3f newColor) {
		getDisplay().asyncExec(new Runnable() {

			@Override
			public void run() {
				if (Color3fComposite.this.colorFieldEditor != null) {
					Color3fComposite.this.colorFieldEditor.getColorSelector().setColorValue(convert(newColor));
				}
			}
		});

		newColorSelected(newColor);
	}

	private Adapter getAdapter() {
		if (this.adapter == null) {
			this.adapter = new AdapterImpl() {
				@Override
				public void notifyChanged(Notification msg) {
					if (msg.getFeature() == getFeature()) {
						if (msg.getNewValue() instanceof Color3f) {
							Color3f color = (Color3f) msg.getNewValue();
							updateDisplayedColor(color);
						} else {
							updateDisplayedColor(null);
						}
					}
				}
			};
		}

		return this.adapter;
	}
}