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annotate dwt/graphics/Font.d @ 255:5a30aa9820f3

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removed tango.stdc.stringz imports and allow null for arrays and string arguments.
author Frank Benoit <benoit@tionex.de>
date Sun, 15 Jun 2008 22:32:20 +0200
parents ce446666f5a2
children c0d810de7093
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2006 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.Font;
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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.graphics.Resource;
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20 import dwt.graphics.FontData;
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21 import dwt.graphics.Device;
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22 import dwt.internal.Converter;
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23 import dwt.internal.gtk.OS;
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24
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25 import tango.text.convert.Format;
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26
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27 /**
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28 * Instances of this class manage operating system resources that
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29 * define how text looks when it is displayed. Fonts may be constructed
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30 * by providing a device and either name, size and style information
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31 * or a <code>FontData</code> object which encapsulates this data.
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32 * <p>
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33 * Application code must explicitly invoke the <code>Font.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 FontData
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39 */
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40 public final class Font : Resource {
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41
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42 alias Resource.init_ init_;
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43 /**
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44 * the handle to the OS font resource
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45 * (Warning: This field is platform dependent)
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46 * <p>
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47 * <b>IMPORTANT:</b> This field is <em>not</em> part of the DWT
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48 * public API. It is marked public only so that it can be shared
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49 * within the packages provided by DWT. It is not available on all
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50 * platforms and should never be accessed from application code.
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51 * </p>
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52 */
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53 public PangoFontDescription* handle;
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54
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55 this(Device device) {
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56 super(device);
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57 }
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58
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59 /**
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60 * Constructs a new font given a device and font data
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61 * which describes the desired font's appearance.
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62 * <p>
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63 * You must dispose the font when it is no longer required.
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64 * </p>
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65 *
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66 * @param device the device to create the font on
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67 * @param fd the FontData that describes the desired font (must not be null)
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68 *
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69 * @exception IllegalArgumentException <ul>
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70 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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71 * <li>ERROR_NULL_ARGUMENT - if the fd argument is null</li>
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72 * </ul>
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73 * @exception DWTError <ul>
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74 * <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li>
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75 * </ul>
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76 */
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77 public this(Device device, FontData fd) {
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78 super(device);
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79 if (fd is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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80 init_(fd.getName(), fd.getHeightF(), fd.getStyle(), fd.str);
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81 init_();
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82 }
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83
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84 /**
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85 * Constructs a new font given a device and an array
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86 * of font data which describes the desired font's
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87 * appearance.
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88 * <p>
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89 * You must dispose the font when it is no longer required.
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90 * </p>
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91 *
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92 * @param device the device to create the font on
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93 * @param fds the array of FontData that describes the desired font (must not be null)
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94 *
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95 * @exception IllegalArgumentException <ul>
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96 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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97 * <li>ERROR_NULL_ARGUMENT - if the fds argument is null</li>
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98 * <li>ERROR_INVALID_ARGUMENT - if the length of fds is zero</li>
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99 * <li>ERROR_NULL_ARGUMENT - if any fd in the array is null</li>
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100 * </ul>
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101 * @exception DWTError <ul>
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102 * <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li>
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103 * </ul>
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104 *
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105 * @since 2.1
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106 */
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107 public this(Device device, FontData[] fds) {
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108 super(device);
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109 if (fds is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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110 if (fds.length is 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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111 for (int i=0; i<fds.length; i++) {
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112 if (fds[i] is null) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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113 }
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114 FontData fd = fds[0];
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115 init_(fd.getName(), fd.getHeightF(), fd.getStyle(), fd.str);
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116 init_();
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117 }
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118
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119 /**
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120 * Constructs a new font given a device, a font name,
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121 * the height of the desired font in points, and a font
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122 * style.
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123 * <p>
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124 * You must dispose the font when it is no longer required.
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125 * </p>
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126 *
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127 * @param device the device to create the font on
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128 * @param name the name of the font (must not be null)
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129 * @param height the font height in points
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130 * @param style a bit or combination of NORMAL, BOLD, ITALIC
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131 *
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132 * @exception IllegalArgumentException <ul>
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133 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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134 * <li>ERROR_NULL_ARGUMENT - if the name argument is null</li>
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135 * <li>ERROR_INVALID_ARGUMENT - if the height is negative</li>
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136 * </ul>
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137 * @exception DWTError <ul>
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138 * <li>ERROR_NO_HANDLES - if a font could not be created from the given arguments</li>
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139 * </ul>
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140 */
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141 public this(Device device, String name, int height, int style) {
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142 super(device);
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143 init_(name, height, style, null);
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144 init_();
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145 }
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146
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147 /*public*/ this(Device device, String name, float height, int style) {
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148 super(device);
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149 init_(name, height, style, null);
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150 init_();
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151 }
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152
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153 void destroy() {
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154 OS.pango_font_description_free(handle);
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155 handle = null;
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156 }
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157
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158 /**
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159 * Compares the argument to the receiver, and returns true
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160 * if they represent the <em>same</em> object using a class
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161 * specific comparison.
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162 *
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163 * @param object the object to compare with this object
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164 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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165 *
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166 * @see #hashCode
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167 */
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168 public override int opEquals(Object object) {
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169 if (object is this) return true;
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170 if ( auto font = cast(Font)object ){
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171 return handle is font.handle;
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172 }
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173 return false;
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174 }
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175
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176
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177 /**
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178 * Returns an array of <code>FontData</code>s representing the receiver.
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179 * On Windows, only one FontData will be returned per font. On X however,
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180 * a <code>Font</code> object <em>may</em> be composed of multiple X
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181 * fonts. To support this case, we return an array of font data objects.
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182 *
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183 * @return an array of font data objects describing the receiver
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184 *
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185 * @exception DWTException <ul>
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186 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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187 * </ul>
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188 */
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189 public FontData[] getFontData() {
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190 if (isDisposed()) DWT.error(DWT.ERROR_GRAPHIC_DISPOSED);
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191
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192 auto family = OS.pango_font_description_get_family(handle);
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193 String name = fromStringz( family );
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194 float height = cast(float)OS.pango_font_description_get_size(handle) / OS.PANGO_SCALE;
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195 int pangoStyle = OS.pango_font_description_get_style(handle);
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196 int pangoWeight = OS.pango_font_description_get_weight(handle);
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197 int style = DWT.NORMAL;
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198 if (pangoStyle is OS.PANGO_STYLE_ITALIC) style |= DWT.ITALIC;
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199 if (pangoStyle is OS.PANGO_STYLE_OBLIQUE) style |= DWT.ROMAN;
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200 if (pangoWeight >= OS.PANGO_WEIGHT_BOLD) style |= DWT.BOLD;
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201 auto fontString = OS.pango_font_description_to_string (handle);
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202 auto buffer = fromStringz( fontString ).dup;
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203 FontData data = new FontData( buffer , height, style);
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204 OS.g_free (fontString);
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205 data.str = buffer;
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206 return [data];
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207 }
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208
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209 /**
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210 * Invokes platform specific functionality to allocate a new font.
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211 * <p>
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212 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
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213 * API for <code>Font</code>. It is marked public only so that it
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214 * can be shared within the packages provided by DWT. It is not
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215 * available on all platforms, and should never be called from
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216 * application code.
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217 * </p>
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218 *
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219 * @param device the device on which to allocate the color
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220 * @param handle the handle for the font
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221 *
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222 * @private
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223 */
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224 public static Font gtk_new(Device device, PangoFontDescription* handle) {
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225 Font font = new Font(device);
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226 font.handle = handle;
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227 return font;
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228 }
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229
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230 /**
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231 * Returns an integer hash code for the receiver. Any two
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232 * objects that return <code>true</code> when passed to
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233 * <code>equals</code> must return the same value for this
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234 * method.
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235 *
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236 * @return the receiver's hash
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237 *
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238 * @see #equals
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239 */
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240 public override hash_t toHash() {
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241 return cast(hash_t)/*64*/handle;
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242 }
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243
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244 void init_(String name, float height, int style, char[] fontString) {
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245 if (name is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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246 if (height < 0) DWT.error(DWT.ERROR_INVALID_ARGUMENT);
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247 if (fontString !is null) {
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248 handle = OS.pango_font_description_from_string (toStringz(fontString));
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249 if (handle is null) DWT.error(DWT.ERROR_NO_HANDLES);
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250 } else {
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251 handle = OS.pango_font_description_new();
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252 if (handle is null) DWT.error(DWT.ERROR_NO_HANDLES);
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253 //byte[] buffer = Converter.wcsToMbcs(null, name, true);
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254 OS.pango_font_description_set_family(handle, toStringz(name) );
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255 if (height > 0) {
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256 OS.pango_font_description_set_size(handle, cast(int)(0.5f + height * OS.PANGO_SCALE));
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257 }
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258 OS.pango_font_description_set_stretch(handle, OS.PANGO_STRETCH_NORMAL);
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259 int pangoStyle = OS.PANGO_STYLE_NORMAL;
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260 int pangoWeight = OS.PANGO_WEIGHT_NORMAL;
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261 if ((style & DWT.ITALIC) !is 0) pangoStyle = OS.PANGO_STYLE_ITALIC;
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262 if ((style & DWT.ROMAN) !is 0) pangoStyle = OS.PANGO_STYLE_OBLIQUE;
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263 if ((style & DWT.BOLD) !is 0) pangoWeight = OS.PANGO_WEIGHT_BOLD;
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264 OS.pango_font_description_set_style(handle, pangoStyle);
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265 OS.pango_font_description_set_weight(handle, pangoWeight);
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266 }
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267 }
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268
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269 /**
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270 * Returns <code>true</code> if the font has been disposed,
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271 * and <code>false</code> otherwise.
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272 * <p>
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273 * This method gets the dispose state for the font.
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274 * When a font has been disposed, it is an error to
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275 * invoke any other method using the font.
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276 *
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277 * @return <code>true</code> when the font is disposed and <code>false</code> otherwise
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278 */
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279 public override bool isDisposed() {
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280 return handle is null;
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281 }
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282
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283 /**
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284 * Returns a string containing a concise, human-readable
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285 * description of the receiver.
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286 *
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287 * @return a string representation of the receiver
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288 */
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289 public String toString () {
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290 if (isDisposed()) return "Font {*DISPOSED*}";
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291 return Format( "Font {{{}}", handle );
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292 }
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293
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294 }