annotate dwt/graphics/Color.d @ 364:2bcb17ebe0be default tip

fix: thx torhu
author Frank Benoit <benoit@tionex.de>
date Sun, 08 Nov 2009 20:57:46 +0100
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children
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 dwt.graphics.Color;
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15 import dwt.dwthelper.utils;
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16
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18 import dwt.DWT;
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19 import dwt.internal.gtk.OS;
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20 import dwt.graphics.Resource;
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21 import dwt.graphics.RGB;
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22 import dwt.graphics.Device;
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24 import tango.text.convert.Format;
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27 /**
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28 * Instances of this class manage the operating system resources that
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29 * implement DWT's RGB color model. To create a color you can either
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30 * specify the individual color components as integers in the range
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31 * 0 to 255 or provide an instance of an <code>RGB</code>.
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32 * <p>
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33 * Application code must explicitly invoke the <code>Color.dispose()</code>
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34 * method to release the operating system resources managed by each instance
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35 * when those instances are no longer required.
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36 * </p>
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37 *
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38 * @see RGB
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39 * @see Device#getSystemColor
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40 * @see <a href="http://www.eclipse.org/swt/snippets/#color">Color and RGB snippets</a>
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41 * @see <a href="http://www.eclipse.org/swt/examples.php">DWT Example: PaintExample</a>
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42 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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43 */
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44 public final class Color : Resource {
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45 alias Resource.init_ init_;
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46 /**
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47 * the handle to the OS color resource
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48 * (Warning: This field is platform dependent)
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49 * <p>
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50 * <b>IMPORTANT:</b> This field is <em>not</em> part of the DWT
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51 * public API. It is marked public only so that it can be shared
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52 * within the packages provided by DWT. It is not available on all
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53 * platforms and should never be accessed from application code.
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54 * </p>
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55 */
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56 public GdkColor* handle;
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57
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58 this(Device device) {
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59 super(device);
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60 }
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61
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62 /**
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63 * Constructs a new instance of this class given a device and the
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64 * desired red, green and blue values expressed as ints in the range
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65 * 0 to 255 (where 0 is black and 255 is full brightness). On limited
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66 * color devices, the color instance created by this call may not have
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67 * the same RGB values as the ones specified by the arguments. The
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68 * RGB values on the returned instance will be the color values of
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69 * the operating system color.
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70 * <p>
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71 * You must dispose the color when it is no longer required.
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72 * </p>
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73 *
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74 * @param device the device on which to allocate the color
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75 * @param red the amount of red in the color
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76 * @param green the amount of green in the color
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77 * @param blue the amount of blue in the color
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78 *
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79 * @exception IllegalArgumentException <ul>
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80 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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81 * <li>ERROR_INVALID_ARGUMENT - if the red, green or blue argument is not between 0 and 255</li>
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82 * </ul>
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83 *
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84 * @see #dispose
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85 */
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86 public this(Device device, int red, int green, int blue) {
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87 super(device);
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88 init_(red, green, blue);
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89 init_();
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90 }
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91
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92 /**
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93 * Constructs a new instance of this class given a device and an
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94 * <code>RGB</code> describing the desired red, green and blue values.
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95 * On limited color devices, the color instance created by this call
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96 * may not have the same RGB values as the ones specified by the
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97 * argument. The RGB values on the returned instance will be the color
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98 * values of the operating system color.
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99 * <p>
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100 * You must dispose the color when it is no longer required.
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101 * </p>
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102 *
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103 * @param device the device on which to allocate the color
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104 * @param rgb the RGB values of the desired color
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105 *
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106 * @exception IllegalArgumentException <ul>
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107 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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108 * <li>ERROR_NULL_ARGUMENT - if the rgb argument is null</li>
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109 * <li>ERROR_INVALID_ARGUMENT - if the red, green or blue components of the argument are not between 0 and 255</li>
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110 * </ul>
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111 *
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112 * @see #dispose
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113 */
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114 public this(Device device, RGB rgb) {
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115 super(device);
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116 if (rgb is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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117 init_(rgb.red, rgb.green, rgb.blue);
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118 init_();
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119 }
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120
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121 void destroy() {
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122 int pixel = handle.pixel;
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123 if (device.colorRefCount !is null) {
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124 /* If this was the last reference, remove the color from the list */
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125 if (--device.colorRefCount[pixel] is 0) {
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126 device.gdkColors[pixel] = null;
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127 }
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128 }
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129 auto colormap = OS.gdk_colormap_get_system();
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130 OS.gdk_colormap_free_colors(colormap, handle, 1);
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131 handle = null;
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132 }
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133
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134 /**
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135 * Compares the argument to the receiver, and returns true
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136 * if they represent the <em>same</em> object using a class
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137 * specific comparison.
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138 *
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139 * @param object the object to compare with this object
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140 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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141 *
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142 * @see #hashCode
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143 */
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144 public override int opEquals(Object object) {
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145 if (object is this) return true;
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146 if ( auto color = cast(Color)object ){
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147 GdkColor* gdkColor = color.handle;
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148 if (handle is gdkColor) return true;
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149 return device is color.device && handle.red is gdkColor.red &&
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150 handle.green is gdkColor.green && handle.blue is gdkColor.blue;
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151 }
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152 return false;
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153 }
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154
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155 /**
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156 * Returns the amount of blue in the color, from 0 to 255.
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157 *
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158 * @return the blue component of the color
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159 *
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160 * @exception DWTException <ul>
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161 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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162 * </ul>
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163 */
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164 public int getBlue() {
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165 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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166 return (handle.blue >> 8) & 0xFF;
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167 }
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168
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169 /**
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170 * Returns the amount of green in the color, from 0 to 255.
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171 *
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172 * @return the green component of the color
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173 *
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174 * @exception DWTException <ul>
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175 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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176 * </ul>
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177 */
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178 public int getGreen() {
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179 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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180 return (handle.green >> 8) & 0xFF;
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181 }
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182
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183 /**
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184 * Returns the amount of red in the color, from 0 to 255.
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185 *
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186 * @return the red component of the color
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187 *
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188 * @exception DWTException <ul>
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189 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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190 * </ul>
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191 */
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192 public int getRed() {
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193 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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194 return (handle.red >> 8) & 0xFF;
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195 }
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196
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197 /**
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198 * Returns an integer hash code for the receiver. Any two
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199 * objects that return <code>true</code> when passed to
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200 * <code>equals</code> must return the same value for this
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201 * method.
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202 *
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203 * @return the receiver's hash
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204 *
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205 * @see #equals
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206 */
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207 public override hash_t toHash() {
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208 if (isDisposed()) return 0;
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209 return handle.red ^ handle.green ^ handle.blue;
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210 }
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211
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212 /**
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213 * Returns an <code>RGB</code> representing the receiver.
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214 *
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215 * @return the RGB for the color
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216 *
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217 * @exception DWTException <ul>
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218 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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219 * </ul>
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220 */
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221 public RGB getRGB () {
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222 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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223 return new RGB(getRed(), getGreen(), getBlue());
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224 }
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225
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226 /**
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227 * Invokes platform specific functionality to allocate a new color.
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228 * <p>
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229 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
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230 * API for <code>Color</code>. It is marked public only so that it
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231 * can be shared within the packages provided by DWT. It is not
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232 * available on all platforms, and should never be called from
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233 * application code.
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234 * </p>
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235 *
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236 * @param device the device on which to allocate the color
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237 * @param handle the handle for the color
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238 *
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239 * @private
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240 */
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241 public static Color gtk_new(Device device, GdkColor* gdkColor) {
240
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242 Color color = new Color(device);
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243 color.handle = gdkColor;
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244 return color;
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245 }
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246
240
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247 void init_(int red, int green, int blue) {
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248 if ((red > 255) || (red < 0) ||
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249 (green > 255) || (green < 0) ||
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250 (blue > 255) || (blue < 0)) {
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251 DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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252 }
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253 GdkColor* gdkColor = new GdkColor();
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254 gdkColor.red = cast(short)((red & 0xFF) | ((red & 0xFF) << 8));
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255 gdkColor.green = cast(short)((green & 0xFF) | ((green & 0xFF) << 8));
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256 gdkColor.blue = cast(short)((blue & 0xFF) | ((blue & 0xFF) << 8));
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257 auto colormap = OS.gdk_colormap_get_system();
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258 if (!OS.gdk_colormap_alloc_color(colormap, gdkColor, true, true)) {
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259 /* Allocate black. */
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260 gdkColor = new GdkColor();
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261 OS.gdk_colormap_alloc_color(colormap, gdkColor, true, true);
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262 }
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263 handle = gdkColor;
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264 if (device.colorRefCount !is null) {
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265 /* Make a copy of the color to put in the colors array */
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266 GdkColor* colorCopy = new GdkColor();
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267 colorCopy.red = handle.red;
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268 colorCopy.green = handle.green;
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269 colorCopy.blue = handle.blue;
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270 colorCopy.pixel = handle.pixel;
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271 device.gdkColors[colorCopy.pixel] = colorCopy;
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272 device.colorRefCount[colorCopy.pixel]++;
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273 }
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274 }
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275
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276 /**
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277 * Returns <code>true</code> if the color has been disposed,
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278 * and <code>false</code> otherwise.
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279 * <p>
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280 * This method gets the dispose state for the color.
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281 * When a color has been disposed, it is an error to
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282 * invoke any other method using the color.
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283 *
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284 * @return <code>true</code> when the color is disposed and <code>false</code> otherwise
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285 */
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286 public override bool isDisposed() {
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287 return handle is null;
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288 }
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289
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290 /**
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291 * Returns a string containing a concise, human-readable
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292 * description of the receiver.
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293 *
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294 * @return a string representation of the receiver
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295 */
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296 public override String toString () {
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297 if (isDisposed()) return "Color {*DISPOSED*}";
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298 return Format( "Color {{{}, {}, {}}", getRed(), getGreen(), getBlue());
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299 }
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300
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301 }