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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.internal.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;
import org.eclipse.ui.themes.ColorUtil;
import org.eclipse.ui.themes.IColorFactory;
/**
* A <code>IColorFactory</code> that may be used to select a color with a higher
* contrast. The input colors are specified as per method number two in
* {@link org.eclipse.core.runtime.IExecutableExtension}.
* <p>
* Example usage:
*
* <pre>
* <colorDefinition
* label="Declaration view background"
* id="org.eclipse.jdt.ui.DeclarationView.backgroundColor">
* <colorFactory
* plugin="org.eclipse.ui"
* class="org.eclipse.ui.internal.themes.RGBContrastFactory">
* <parameter name="foreground" value="0,0,0" />
* <parameter name="background" value="COLOR_INFO_BACKGROUND" />
* <parameter name="alternativeBackground" value="COLOR_LIST_BACKGROUND" />
* </colorFactory>
* </colorDefinition>
* </pre>
*
* <p>
* Returns <em>background</em> if <em>foreground</em> is visibly distinct from
* <em>background</em>. Otherwise, returns <em>alternativeBackground</em> if
* that color has more difference in brightness to the foreground. If both
* colors are bad, returns <em>background</em>. The color values may be
* specified as RGB triples or as SWT constants.
*
* @see org.eclipse.swt.SWT
* @since 3.107.100
*/
// This class is used by org.eclipse.jdt.ui/plugin.xml to fix
// https://bugs.eclipse.org/477487
public class RGBVisibleContrastColorFactory implements IColorFactory, IExecutableExtension {
private String fg, bg, altBg;
@Override
public RGB createColor() {
RGB cfg, cbg, cbgAlt;
if (fg != null) {
cfg = ColorUtil.getColorValue(fg);
} else {
cfg = new RGB(0, 0, 0);
}
if (bg != null) {
cbg = ColorUtil.getColorValue(bg);
} else {
cbg = new RGB(255, 255, 255);
}
if (altBg != null) {
cbgAlt = ColorUtil.getColorValue(altBg);
} else {
cbgAlt = new RGB(255, 255, 255);
}
float bfg = cfg.getHSB()[2];
float bbg = cbg.getHSB()[2];
float bbgAlt = cbgAlt.getHSB()[2];
if (Math.abs(bbg - bfg) < 0.5f && Math.abs(bbgAlt - bfg) > Math.abs(bbg - bfg)) {
return cbgAlt;
}
return cbg;
}
/**
* 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 three parameters,
* <code>foreground</code>, <code>background</code> and
* <code>alternativeBackground</code>. These values may either be RGB triples or
* SWT constants.
*/
@Override
public void setInitializationData(IConfigurationElement config, String propertyName, Object data)
throws CoreException {
if (data instanceof Hashtable) {
@SuppressWarnings("unchecked")
Hashtable<String, String> table = (Hashtable<String, String>) data;
fg = table.get("foreground"); //$NON-NLS-1$
bg = table.get("background"); //$NON-NLS-1$
altBg = table.get("alternativeBackground"); //$NON-NLS-1$
}
}
}
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