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annotate dwt/graphics/Font.d @ 30:93b13b15f0b1

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Ported a couple of modules in dwt.graphics
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Thu, 11 Sep 2008 23:16:53 +0200
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children db5a898b2119
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 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 *
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11 * Port to the D programming language:
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12 * Jacob Carlborg <jacob.carlborg@gmail.com>
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13 *******************************************************************************/
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14 module dwt.graphics.Font;
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16
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17 import dwt.DWT;
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18 import dwt.DWTError;
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19 import dwt.DWTException;
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20 import dwt.internal.cocoa.NSFont;
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21 import dwt.internal.cocoa.NSString;
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23 import tango.stdc.stringz;
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24 import tango.text.convert.Utf;
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26 import dwt.dwthelper.utils;
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27 import dwt.graphics.Device;
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28 import dwt.graphics.FontData;
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29 import dwt.graphics.Resource;
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30 import dwt.internal.cocoa.CGFloat;
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31
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32 /**
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33 * Instances of this class manage operating system resources that
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34 * define how text looks when it is displayed. Fonts may be constructed
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35 * by providing a device and either name, size and style information
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36 * or a <code>FontData</code> object which encapsulates this data.
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37 * <p>
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38 * Application code must explicitly invoke the <code>Font.dispose()</code>
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39 * method to release the operating system resources managed by each instance
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40 * when those instances are no longer required.
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41 * </p>
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42 *
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43 * @see FontData
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44 */
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45 public final class Font : Resource {
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46
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47 /**
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48 * the handle to the OS font resource
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49 * (Warning: This field is platform dependent)
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50 * <p>
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51 * <b>IMPORTANT:</b> This field is <em>not</em> part of the DWT
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52 * public API. It is marked public only so that it can be shared
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53 * within the packages provided by DWT. It is not available on all
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54 * platforms and should never be accessed from application code.
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55 * </p>
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56 */
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57 public NSFont handle;
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58
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59 this(Device device) {
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60 super(device);
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61 }
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63 /**
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64 * Constructs a new font given a device and font data
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65 * which describes the desired font's appearance.
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66 * <p>
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67 * You must dispose the font when it is no longer required.
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68 * </p>
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69 *
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70 * @param device the device to create the font on
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71 * @param fd the FontData that describes the desired font (must not be null)
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72 *
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73 * @exception IllegalArgumentException <ul>
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74 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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75 * <li>ERROR_NULL_ARGUMENT - if the fd argument is null</li>
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76 * </ul>
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77 * @exception DWTError <ul>
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78 * <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li>
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79 * </ul>
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80 */
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81 public this(Device device, FontData fd) {
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82 super(device);
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83 if (fd is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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84 init(fd.getName(), fd.getHeightF(), fd.getStyle(), fd.nsName);
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85 init();
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86 }
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87
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88 /**
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89 * Constructs a new font given a device and an array
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90 * of font data which describes the desired font's
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91 * appearance.
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92 * <p>
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93 * You must dispose the font when it is no longer required.
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94 * </p>
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95 *
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96 * @param device the device to create the font on
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97 * @param fds the array of FontData that describes the desired font (must not be null)
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98 *
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99 * @exception IllegalArgumentException <ul>
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100 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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101 * <li>ERROR_NULL_ARGUMENT - if the fds argument is null</li>
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102 * <li>ERROR_INVALID_ARGUMENT - if the length of fds is zero</li>
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103 * <li>ERROR_NULL_ARGUMENT - if any fd in the array is null</li>
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104 * </ul>
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105 * @exception DWTError <ul>
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106 * <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li>
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107 * </ul>
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108 *
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109 * @since 2.1
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110 */
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111 public this(Device device, FontData[] fds) {
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112 super(device);
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113 if (fds is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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114 if (fds.length is 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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115 for (int i=0; i<fds.length; i++) {
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116 if (fds[i] is null) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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117 }
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118 FontData fd = fds[0];
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119 init(fd.getName(), fd.getHeightF(), fd.getStyle(), fd.nsName);
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120 init();
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121 }
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122
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123 /**
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124 * Constructs a new font given a device, a font name,
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125 * the height of the desired font in points, and a font
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126 * style.
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127 * <p>
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128 * You must dispose the font when it is no longer required.
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129 * </p>
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130 *
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131 * @param device the device to create the font on
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132 * @param name the name of the font (must not be null)
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133 * @param height the font height in points
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134 * @param style a bit or combination of NORMAL, BOLD, ITALIC
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135 *
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136 * @exception IllegalArgumentException <ul>
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137 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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138 * <li>ERROR_NULL_ARGUMENT - if the name argument is null</li>
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139 * <li>ERROR_INVALID_ARGUMENT - if the height is negative</li>
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140 * </ul>
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141 * @exception DWTError <ul>
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142 * <li>ERROR_NO_HANDLES - if a font could not be created from the given arguments</li>
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143 * </ul>
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144 */
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145 public this(Device device, String name, int height, int style) {
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146 super(device);
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147 init(name, height, style, null);
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148 init();
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149 }
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150
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151 /*public*/ this(Device device, String name, float height, int style) {
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152 super(device);
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153 init(name, height, style, null);
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154 init();
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155 }
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156
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157 void destroy() {
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158 handle.release();
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159 handle = null;
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160 }
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161
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162 /**
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163 * Compares the argument to the receiver, and returns true
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164 * if they represent the <em>same</em> object using a class
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165 * specific comparison.
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166 *
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167 * @param object the object to compare with this object
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168 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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169 *
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170 * @see #hashCode
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171 */
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172 public bool opEquals(Object object) {
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173 if (object is this) return true;
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174 if (!( null !is cast(Font)object )) return false;
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175 Font font = cast(Font)object;
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176 return handle is font.handle;
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177 }
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178
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179 alias opEquals equals;
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180
0
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181 /**
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182 * Returns an array of <code>FontData</code>s representing the receiver.
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183 * On Windows, only one FontData will be returned per font. On X however,
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184 * a <code>Font</code> object <em>may</em> be composed of multiple X
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185 * fonts. To support this case, we return an array of font data objects.
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186 *
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187 * @return an array of font data objects describing the receiver
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188 *
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189 * @exception DWTException <ul>
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190 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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191 * </ul>
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192 */
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193 public FontData[] getFontData() {
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194 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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195 NSString family = handle.familyName();
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196 wchar[] buffer1 = new wchar[family.length()];
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197 family.getCharacters_(buffer1);
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198 String name = buffer1.toString().dup;
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199 NSString str = handle.fontName();
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200 wchar[] buffer = new wchar[str.length()];
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201 str.getCharacters_(buffer);
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202 String nsName = buffer.toString().dup;
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203 int style = DWT.NORMAL;
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204 if (nsName.indexOf("Italic") !is -1) style |= DWT.ITALIC;
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205 if (nsName.indexOf("Bold") !is -1) style |= DWT.BOLD;
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206 FontData data = new FontData(name, handle.pointSize(), style);
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207 data.nsName = nsName;
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208 return new FontData[][data];
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209 }
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210
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211 /**
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212 * Invokes platform specific functionality to allocate a new font.
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213 * <p>
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214 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
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215 * API for <code>Font</code>. It is marked public only so that it
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216 * can be shared within the packages provided by DWT. It is not
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217 * available on all platforms, and should never be called from
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218 * application code.
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219 * </p>
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220 *
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221 * @param device the device on which to allocate the color
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222 * @param handle the handle for the font
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223 * @param style the style for the font
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224 * @param size the size for the font
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225 *
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226 * @private
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227 */
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228 public static Font cocoa_new(Device device, NSFont handle) {
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229 Font font = new Font(device);
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230 font.handle = handle;
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231 return font;
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232 }
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233
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234 /**
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235 * Returns an integer hash code for the receiver. Any two
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236 * objects that return <code>true</code> when passed to
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237 * <code>equals</code> must return the same value for this
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238 * method.
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239 *
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240 * @return the receiver's hash
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241 *
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242 * @see #equals
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243 */
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244 public hash_t toHash() {
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245 return handle !is null ? handle.id : 0;
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246 }
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247
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248 alias toHash hashCode;
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249
0
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250 void init(String name, float height, int style, String nsName) {
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251 //if (name is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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252 if (height < 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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253 if (nsName !is null) {
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254 handle = NSFont.static_fontWithName_size_(NSString.stringWith(nsName), cast(CGFloat) height);
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255 } else {
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256 nsName = name;
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257 if ((style & DWT.BOLD) !is 0) nsName += " Bold";
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258 if ((style & DWT.ITALIC) !is 0) nsName += " Italic";
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259 handle = NSFont.static_fontWithName_size_(NSString.stringWith(nsName), cast(CGFloat) height);
0
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260 if (handle is null && (style & DWT.ITALIC) !is 0) {
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261 nsName = name;
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262 if ((style & DWT.BOLD) !is 0) nsName += " Bold";
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263 handle = NSFont.static_fontWithName_size_(NSString.stringWith(nsName), cast(CGFloat) height);
0
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264 }
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265 if (handle is null && (style & DWT.BOLD) !is 0) {
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266 nsName = name;
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267 handle = NSFont.static_fontWithName_size_(NSString.stringWith(nsName), cast(CGFloat) height);
0
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268 }
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269 }
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270 if (handle is null) {
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271 handle = device.systemFont.handle;
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272 }
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273 handle.retain();
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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 font 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 font.
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281 * When a font has been disposed, it is an error to
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282 * invoke any other method using the font.
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283 *
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284 * @return <code>true</code> when the font is disposed and <code>false</code> otherwise
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285 */
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286 public 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 String toString () {
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297 if (isDisposed()) return "Font {*DISPOSED*}";
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298 return "Font {" ~ handle ~ "}";
0
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299 }
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300
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301 }