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/*******************************************************************************
* Copyright (c) 2004, 2015 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.themes;
import java.util.Hashtable;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExecutableExtension;
import org.eclipse.swt.graphics.RGB;
/**
* A reusable <code>IColorFactory</code> that may be used to blend two colors.
* The colors to blend are specified as per method number two in
* {@link org.eclipse.core.runtime.IExecutableExtension}.
* <p>
* Example usage:
* </p>
*
* <pre>
* <code>
* <colorDefinition label="Red/Blue Blend" id="example.redblueblend">
* <colorFactory plugin="org.eclipse.ui"
* class="org.eclipse.ui.themes.RGBBlendColorFactory">
* <parameter name="color1" value="255,0,0" />
* <parameter name="color2" value="COLOR_BLUE" />
* </colorFactory>
* </colorDefinition>
* </code>
* </pre>
*
* <p>
* The color values may be specified as RGB triples or as SWT constants.
* </p>
*
* @see org.eclipse.swt.SWT
* @since 3.0
*/
public class RGBBlendColorFactory implements IColorFactory, IExecutableExtension {
private String color1, color2;
@Override
public RGB createColor() {
if (color1 == null && color2 == null) {
return new RGB(0, 0, 0);
} else if (color1 != null && color2 == null) {
return ColorUtil.getColorValue(color1);
} else if (color1 == null && color2 != null) {
return ColorUtil.getColorValue(color2);
} else {
RGB rgb1 = ColorUtil.getColorValue(color1);
RGB rgb2 = ColorUtil.getColorValue(color2);
return ColorUtil.blend(rgb1, rgb2);
}
}
/**
* This executable extension requires parameters to be explicitly declared via
* the second method described in the <code>IExecutableExtension</code>
* documentation. This class expects that there will be two parameters,
* <code>color1</code> and <code>color2</code>, that describe the two colors to
* be blended. These values may either be RGB triples or SWT constants.
*
* @see org.eclipse.core.runtime.IExecutableExtension#setInitializationData(org.eclipse.core.runtime.IConfigurationElement,
* java.lang.String, java.lang.Object)
*/
@Override
public void setInitializationData(IConfigurationElement config, String propertyName, Object data)
throws CoreException {
if (data instanceof Hashtable) {
Hashtable table = (Hashtable) data;
color1 = (String) table.get("color1"); //$NON-NLS-1$
color2 = (String) table.get("color2"); //$NON-NLS-1$
}
}
}
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