///*******************************************************************************
// * Copyright (c) 2006, 2007 IBM Corporation and others.
// * 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:
// * IBM Corporation - initial API and implementation
// *******************************************************************************/
//package org.eclipse.jface.fieldassist;
//
//import java.util.ArrayList;
//import java.util.HashMap;
//import java.util.Iterator;
//import java.util.List;
//import java.util.Map;
//
//import org.eclipse.jface.resource.JFaceColors;
//import org.eclipse.swt.SWT;
//import org.eclipse.swt.graphics.Color;
//import org.eclipse.swt.graphics.RGB;
//import org.eclipse.swt.widgets.Control;
//import org.eclipse.swt.widgets.Display;
//
///**
// * FieldAssistColors defines protocol for retrieving colors that can be used to
// * provide visual cues with fields. For consistency with JFace dialogs and
// * wizards, it is recommended that FieldAssistColors is used when colors are
// * used to annotate fields.
// * <p>
// * Color resources that are returned using methods in this class are maintained
// * in the JFace color registries, or by SWT. Users of any color resources
// * provided by this class are not responsible for the lifecycle of the color.
// * Colors provided by this class should never be disposed by clients. In some
// * cases, clients are provided information, such as RGB values, in order to
// * create their own color resources. In these cases, the client should manage
// * the lifecycle of any created resource.
// *
// * @since 1.0
// * @deprecated As of 3.3, this class is no longer necessary.
// */
//public class FieldAssistColors {
//
// private static boolean DEBUG = false;
//
// /*
// * Keys are background colors, values are the color with the alpha value
// * applied
// */
// private static Map requiredFieldColorMap = new HashMap();
//
// /*
// * Keys are colors we have created, values are the displays on which they
// * were created.
// */
// private static Map displays = new HashMap();
//
// /**
// * Compute the RGB of the color that should be used for the background of a
// * control to indicate that the control has an error. Because the color
// * suitable for indicating an error depends on the colors set into the
// * control, this color is always computed dynamically and provided as an RGB
// * value. Clients who use this RGB to create a Color resource are
// * responsible for managing the life cycle of the color.
// * <p>
// * This color is computed dynamically each time that it is queried. Clients
// * should typically call this method once, create a color from the RGB
// * provided, and dispose of the color when finished using it.
// *
// * @param control
// * the control for which the background color should be computed.
// * @return the RGB value indicating a background color appropriate for
// * indicating an error in the control.
// */
// public static RGB computeErrorFieldBackgroundRGB(Control control) {
// /*
// * Use a 10% alpha of the error color applied on top of the widget
// * background color.
// */
// Color dest = control.getBackground();
// Color src = JFaceColors.getErrorText(control.getDisplay());
// int destRed = dest.getRed();
// int destGreen = dest.getGreen();
// int destBlue = dest.getBlue();
//
// // 10% alpha
// int alpha = (int) (0xFF * 0.10f);
// // Alpha blending math
// destRed += (src.getRed() - destRed) * alpha / 0xFF;
// destGreen += (src.getGreen() - destGreen) * alpha / 0xFF;
// destBlue += (src.getBlue() - destBlue) * alpha / 0xFF;
//
// return new RGB(destRed, destGreen, destBlue);
// }
//
// /**
// * Return the color that should be used for the background of a control to
// * indicate that the control is a required field and does not have content.
// * <p>
// * This color is managed by FieldAssistResources and should never be
// * disposed by clients.
// *
// * @param control
// * the control on which the background color will be used.
// * @return the color used to indicate that a field is required.
// */
// public static Color getRequiredFieldBackgroundColor(Control control) {
// final Display display = control.getDisplay();
//
// // If we are in high contrast mode, then don't apply an alpha
// if (display.getHighContrast()) {
// return control.getBackground();
// }
//
// // See if a color has already been computed
// Object storedColor = requiredFieldColorMap.get(control.getBackground());
// if (storedColor != null) {
// return (Color) storedColor;
// }
//
// // There is no color already created, so we must create one.
// // Use a 15% alpha of yellow on top of the widget background.
// Color dest = control.getBackground();
// Color src = display.getSystemColor(SWT.COLOR_YELLOW);
// int destRed = dest.getRed();
// int destGreen = dest.getGreen();
// int destBlue = dest.getBlue();
//
// // 15% alpha
// int alpha = (int) (0xFF * 0.15f);
// // Alpha blending math
// destRed += (src.getRed() - destRed) * alpha / 0xFF;
// destGreen += (src.getGreen() - destGreen) * alpha / 0xFF;
// destBlue += (src.getBlue() - destBlue) * alpha / 0xFF;
//
// // create the color
// Color color = new Color(display, destRed, destGreen, destBlue);
// // record the color in a map using the original color as the key
// requiredFieldColorMap.put(dest, color);
// // If we have never created a color on this display before, install
// // a dispose exec on the display.
// if (!displays.containsValue(display)) {
// display.disposeExec(new Runnable() {
// public void run() {
// disposeColors(display);
// }
// });
// }
// // Record the color and its display in a map for later disposal.
// displays.put(color, display);
// return color;
// }
//
// /*
// * Dispose any colors that were allocated for the given display.
// */
// private static void disposeColors(Display display) {
// List toBeRemoved = new ArrayList(1);
//
// if (DEBUG) {
// System.out.println("Display map is " + displays.toString()); //$NON-NLS-1$
// System.out
// .println("Color map is " + requiredFieldColorMap.toString()); //$NON-NLS-1$
// }
//
// // Look for any stored colors that were created on this display
// for (Iterator i = displays.keySet().iterator(); i.hasNext();) {
// Color color = (Color) i.next();
// if (((Display) displays.get(color)).equals(display)) {
// // The color is on this display. Mark it for removal.
// toBeRemoved.add(color);
//
// // Now look for any references to it in the required field color
// // map
// List toBeRemovedFromRequiredMap = new ArrayList(1);
// for (Iterator iter = requiredFieldColorMap.keySet().iterator(); iter
// .hasNext();) {
// Color bgColor = (Color) iter.next();
// if (((Color) requiredFieldColorMap.get(bgColor))
// .equals(color)) {
// // mark it for removal from the required field color map
// toBeRemovedFromRequiredMap.add(bgColor);
// }
// }
// // Remove references in the required field map now that
// // we are done iterating.
// for (int j = 0; j < toBeRemovedFromRequiredMap.size(); j++) {
// requiredFieldColorMap.remove(toBeRemovedFromRequiredMap
// .get(j));
// }
// }
// }
// // Remove references in the display map now that we are
// // done iterating
// for (int i = 0; i < toBeRemoved.size(); i++) {
// Color color = (Color) toBeRemoved.get(i);
// // Removing from the display map must be done before disposing the
// // color or else the comparison between this color and the one
// // in the map will fail.
// displays.remove(color);
// // Dispose it
// if (DEBUG) {
// System.out.println("Disposing color " + color.toString()); //$NON-NLS-1$
// }
// color.dispose();
// }
// if (DEBUG) {
// System.out.println("Display map is " + displays.toString()); //$NON-NLS-1$
// System.out
// .println("Color map is " + requiredFieldColorMap.toString()); //$NON-NLS-1$
// }
// }
//
//}