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annotate org.eclipse.jface/src/org/eclipse/jface/fieldassist/FieldAssistColors.d @ 18:735224fcc45f

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redirected all printings to DwtLogger
author Frank Benoit <benoit@tionex.de>
date Wed, 18 Mar 2009 09:57:53 +0100
parents bc29606a740c
children
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1 /*******************************************************************************
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2 * Copyright (c) 2006, 2007 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13 module org.eclipse.jface.fieldassist.FieldAssistColors;
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15
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16 import org.eclipse.swt.SWT;
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17 import org.eclipse.swt.graphics.Color;
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18 import org.eclipse.swt.graphics.RGB;
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19 import org.eclipse.swt.widgets.Control;
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20 import org.eclipse.swt.widgets.Display;
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21 import org.eclipse.jface.resource.JFaceColors;
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22
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23 import java.lang.all;
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24 import java.util.List;
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25 import java.util.ArrayList;
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26 import java.util.Iterator;
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27 import java.util.Map;
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28 import java.util.HashMap;
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29 import java.util.Set;
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30
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31 /**
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32 * FieldAssistColors defines protocol for retrieving colors that can be used to
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33 * provide visual cues with fields. For consistency with JFace dialogs and
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34 * wizards, it is recommended that FieldAssistColors is used when colors are
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35 * used to annotate fields.
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36 * <p>
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37 * Color resources that are returned using methods in this class are maintained
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38 * in the JFace color registries, or by SWT. Users of any color resources
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39 * provided by this class are not responsible for the lifecycle of the color.
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40 * Colors provided by this class should never be disposed by clients. In some
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41 * cases, clients are provided information, such as RGB values, in order to
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42 * create their own color resources. In these cases, the client should manage
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43 * the lifecycle of any created resource.
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44 *
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45 * @since 3.2
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46 * @deprecated As of 3.3, this class is no longer necessary.
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47 */
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48 public class FieldAssistColors {
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49
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50 private static bool DEBUG = false;
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51
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52 /*
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53 * Keys are background colors, values are the color with the alpha value
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54 * applied
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55 */
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56 private static Map requiredFieldColorMap;
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57
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58 /*
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59 * Keys are colors we have created, values are the displays on which they
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60 * were created.
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61 */
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62 private static Map displays;
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63
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64 static this(){
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65 requiredFieldColorMap = new HashMap();
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66 displays = new HashMap();
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67 }
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68
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69 /**
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70 * Compute the RGB of the color that should be used for the background of a
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71 * control to indicate that the control has an error. Because the color
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72 * suitable for indicating an error depends on the colors set into the
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73 * control, this color is always computed dynamically and provided as an RGB
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74 * value. Clients who use this RGB to create a Color resource are
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75 * responsible for managing the life cycle of the color.
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76 * <p>
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77 * This color is computed dynamically each time that it is queried. Clients
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78 * should typically call this method once, create a color from the RGB
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79 * provided, and dispose of the color when finished using it.
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80 *
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81 * @param control
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82 * the control for which the background color should be computed.
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83 * @return the RGB value indicating a background color appropriate for
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84 * indicating an error in the control.
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85 */
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86 public static RGB computeErrorFieldBackgroundRGB(Control control) {
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87 /*
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88 * Use a 10% alpha of the error color applied on top of the widget
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89 * background color.
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90 */
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91 Color dest = control.getBackground();
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92 Color src = JFaceColors.getErrorText(control.getDisplay());
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93 int destRed = dest.getRed();
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94 int destGreen = dest.getGreen();
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95 int destBlue = dest.getBlue();
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96
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97 // 10% alpha
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98 int alpha = cast(int) (0xFF * 0.10f);
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99 // Alpha blending math
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100 destRed += (src.getRed() - destRed) * alpha / 0xFF;
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101 destGreen += (src.getGreen() - destGreen) * alpha / 0xFF;
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102 destBlue += (src.getBlue() - destBlue) * alpha / 0xFF;
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103
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104 return new RGB(destRed, destGreen, destBlue);
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105 }
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106
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107 /**
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108 * Return the color that should be used for the background of a control to
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109 * indicate that the control is a required field and does not have content.
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110 * <p>
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111 * This color is managed by FieldAssistResources and should never be
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112 * disposed by clients.
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113 *
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114 * @param control
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115 * the control on which the background color will be used.
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116 * @return the color used to indicate that a field is required.
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117 */
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118 public static Color getRequiredFieldBackgroundColor(Control control) {
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119 final Display display = control.getDisplay();
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120
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121 // If we are in high contrast mode, then don't apply an alpha
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122 if (display.getHighContrast()) {
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123 return control.getBackground();
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124 }
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125
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126 // See if a color has already been computed
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127 Object storedColor = requiredFieldColorMap.get(control.getBackground());
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128 if (storedColor !is null) {
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129 return cast(Color) storedColor;
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130 }
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131
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132 // There is no color already created, so we must create one.
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133 // Use a 15% alpha of yellow on top of the widget background.
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134 Color dest = control.getBackground();
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135 Color src = display.getSystemColor(SWT.COLOR_YELLOW);
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136 int destRed = dest.getRed();
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137 int destGreen = dest.getGreen();
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138 int destBlue = dest.getBlue();
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139
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140 // 15% alpha
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141 int alpha = cast(int) (0xFF * 0.15f);
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142 // Alpha blending math
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143 destRed += (src.getRed() - destRed) * alpha / 0xFF;
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144 destGreen += (src.getGreen() - destGreen) * alpha / 0xFF;
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145 destBlue += (src.getBlue() - destBlue) * alpha / 0xFF;
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146
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147 // create the color
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148 Color color = new Color(display, destRed, destGreen, destBlue);
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149 // record the color in a map using the original color as the key
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150 requiredFieldColorMap.put(dest, color);
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151 // If we have never created a color on this display before, install
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152 // a dispose exec on the display.
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153 if (!displays.containsKey(display)) {
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154 display.disposeExec(new class Runnable {
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155 public void run() {
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156 disposeColors(display);
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157 }
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158 });
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159 }
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160 // Record the color and its display in a map for later disposal.
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161 displays.put(color, display);
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162 return color;
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163 }
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164
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165 /*
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166 * Dispose any colors that were allocated for the given display.
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167 */
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168 private static void disposeColors(Display display) {
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169 List toBeRemoved = new ArrayList(1);
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170
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171 if (DEBUG) {
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172 getDwtLogger.info( __FILE__, __LINE__, "Display map is {}", (cast(Object)displays).toString()); //$NON-NLS-1$
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173 getDwtLogger.info( __FILE__, __LINE__, "Color map is {}", (cast(Object)requiredFieldColorMap).toString()); //$NON-NLS-1$
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174 }
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175
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176 // Look for any stored colors that were created on this display
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177 for (Iterator i = displays.keySet().iterator(); i.hasNext();) {
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178 Color color = cast(Color) i.next();
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179 if ((cast(Display) displays.get(color)).opEquals(display)) {
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180 // The color is on this display. Mark it for removal.
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181 toBeRemoved.add(color);
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182
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183 // Now look for any references to it in the required field color
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184 // map
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185 List toBeRemovedFromRequiredMap = new ArrayList(1);
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186 for (Iterator iter = requiredFieldColorMap.keySet().iterator(); iter
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187 .hasNext();) {
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188 Color bgColor = cast(Color) iter.next();
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189 if ((cast(Color) requiredFieldColorMap.get(bgColor))
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190 .opEquals(color)) {
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191 // mark it for removal from the required field color map
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192 toBeRemovedFromRequiredMap.add(bgColor);
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193 }
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194 }
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195 // Remove references in the required field map now that
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196 // we are done iterating.
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197 for (int j = 0; j < toBeRemovedFromRequiredMap.size(); j++) {
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198 requiredFieldColorMap.remove(toBeRemovedFromRequiredMap
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199 .get(j));
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200 }
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201 }
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202 }
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203 // Remove references in the display map now that we are
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204 // done iterating
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205 for (int i = 0; i < toBeRemoved.size(); i++) {
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206 Color color = cast(Color) toBeRemoved.get(i);
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207 // Removing from the display map must be done before disposing the
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208 // color or else the comparison between this color and the one
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209 // in the map will fail.
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210 displays.remove(color);
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211 // Dispose it
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212 if (DEBUG) {
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213 getDwtLogger.info( __FILE__, __LINE__, "Disposing color {}", color.toString()); //$NON-NLS-1$
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214 }
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215 color.dispose();
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216 }
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217 if (DEBUG) {
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218 getDwtLogger.info( __FILE__, __LINE__, "Display map is {}", (cast(Object)displays).toString()); //$NON-NLS-1$
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219 getDwtLogger.info( __FILE__, __LINE__, "Color map is {}", (cast(Object)requiredFieldColorMap).toString()); //$NON-NLS-1$
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220 }
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221 }
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222
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223 }