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annotate org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/graphics/Font.d @ 0:6dd524f61e62

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add dwt win and basic java stuff
author Frank Benoit <benoit@tionex.de>
date Mon, 02 Mar 2009 14:44:16 +0100
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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 org.eclipse.swt.graphics.Font;
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14
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15 import org.eclipse.swt.SWT;
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16 import org.eclipse.swt.SWTError;
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17 import org.eclipse.swt.SWTException;
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18 import org.eclipse.swt.internal.win32.OS;
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19
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20 import org.eclipse.swt.graphics.Resource;
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21 import org.eclipse.swt.graphics.FontData;
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22 import org.eclipse.swt.graphics.Device;
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23
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24 import tango.text.convert.Format;
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25 import java.lang.all;
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26 //import tango.stdc.stringz;
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27
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28 /**
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29 * Instances of this class manage operating system resources that
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30 * define how text looks when it is displayed. Fonts may be constructed
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31 * by providing a device and either name, size and style information
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32 * or a <code>FontData</code> object which encapsulates this data.
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33 * <p>
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34 * Application code must explicitly invoke the <code>Font.dispose()</code>
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35 * method to release the operating system resources managed by each instance
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36 * when those instances are no longer required.
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37 * </p>
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38 *
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39 * @see FontData
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40 * @see <a href="http://www.eclipse.org/swt/snippets/#font">Font snippets</a>
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41 * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Examples: GraphicsExample, 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
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45 public final class Font : Resource {
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46
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47 alias Resource.init_ init_;
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48 /**
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49 * the handle to the OS font resource
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50 * (Warning: This field is platform dependent)
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51 * <p>
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52 * <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
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53 * public API. It is marked public only so that it can be shared
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54 * within the packages provided by SWT. It is not available on all
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55 * platforms and should never be accessed from application code.
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56 * </p>
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57 */
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58 public HFONT handle;
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59
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60 /**
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61 * Prevents uninitialized instances from being created outside the package.
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62 */
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63 this(Device device) {
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64 super(device);
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65 }
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66
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67 /**
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68 * Constructs a new font given a device and font data
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69 * which describes the desired font's appearance.
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70 * <p>
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71 * You must dispose the font 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 to create the font on
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75 * @param fd the FontData that describes the desired font (must not be null)
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76 *
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77 * @exception IllegalArgumentException <ul>
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78 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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79 * <li>ERROR_NULL_ARGUMENT - if the fd argument is null</li>
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80 * </ul>
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81 * @exception SWTError <ul>
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82 * <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li>
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83 * </ul>
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84 */
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85 public this(Device device, FontData fd) {
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86 super(device);
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87 init_(fd);
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88 init_();
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89 }
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90
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91 /**
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92 * Constructs a new font given a device and an array
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93 * of font data which describes the desired font's
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94 * appearance.
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95 * <p>
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96 * You must dispose the font when it is no longer required.
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97 * </p>
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98 *
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99 * @param device the device to create the font on
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100 * @param fds the array of FontData that describes the desired font (must not be null)
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101 *
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102 * @exception IllegalArgumentException <ul>
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103 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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104 * <li>ERROR_NULL_ARGUMENT - if the fds argument is null</li>
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105 * <li>ERROR_INVALID_ARGUMENT - if the length of fds is zero</li>
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106 * <li>ERROR_NULL_ARGUMENT - if any fd in the array is null</li>
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107 * </ul>
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108 * @exception SWTError <ul>
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109 * <li>ERROR_NO_HANDLES - if a font could not be created from the given font data</li>
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110 * </ul>
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111 *
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112 * @since 2.1
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113 */
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114 public this(Device device, FontData[] fds) {
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115 super(device);
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116 if (fds is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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117 if (fds.length is 0) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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118 for (int i=0; i<fds.length; i++) {
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119 if (fds[i] is null) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
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120 }
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121 init_(fds[0]);
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122 init_();
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123 }
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124
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125 /**
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126 * Constructs a new font given a device, a font name,
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127 * the height of the desired font in points, and a font
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128 * style.
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129 * <p>
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130 * You must dispose the font when it is no longer required.
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131 * </p>
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132 *
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133 * @param device the device to create the font on
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134 * @param name the name of the font (must not be null)
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135 * @param height the font height in points
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136 * @param style a bit or combination of NORMAL, BOLD, ITALIC
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137 *
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138 * @exception IllegalArgumentException <ul>
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139 * <li>ERROR_NULL_ARGUMENT - if device is null and there is no current device</li>
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140 * <li>ERROR_NULL_ARGUMENT - if the name argument is null</li>
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141 * <li>ERROR_INVALID_ARGUMENT - if the height is negative</li>
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142 * </ul>
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143 * @exception SWTError <ul>
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144 * <li>ERROR_NO_HANDLES - if a font could not be created from the given arguments</li>
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145 * </ul>
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146 */
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147 public this(Device device, String name, int height, int style) {
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148 super(device);
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149 if (name is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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150 init_(new FontData (name, height, style));
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151 init_();
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152 }
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153
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154 /*public*/ this(Device device, String name, float height, int style) {
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155 super(device);
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156 if (name is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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157 init_(new FontData (name, height, style));
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158 init_();
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159 }
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160 void destroy() {
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161 OS.DeleteObject(handle);
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162 handle = null;
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163 }
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164
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165 /**
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166 * Compares the argument to the receiver, and returns true
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167 * if they represent the <em>same</em> object using a class
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168 * specific comparison.
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169 *
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170 * @param object the object to compare with this object
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171 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
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172 *
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173 * @see #hashCode
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174 */
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175 public int opEquals(Object object) {
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176 if (object is this) return true;
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177 if ( auto font = cast(Font)object ){
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178 return device is font.device && handle is font.handle;
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179 }
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180 return false;
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181 }
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182
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183 /**
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184 * Returns an array of <code>FontData</code>s representing the receiver.
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185 * On Windows, only one FontData will be returned per font. On X however,
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186 * a <code>Font</code> object <em>may</em> be composed of multiple X
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187 * fonts. To support this case, we return an array of font data objects.
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188 *
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189 * @return an array of font data objects describing the receiver
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190 *
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191 * @exception SWTException <ul>
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192 * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
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193 * </ul>
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194 */
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195 public FontData[] getFontData() {
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196 if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
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197 LOGFONT logFont;
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198 OS.GetObject(handle, LOGFONT.sizeof, &logFont);
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199 return [ cast(FontData) FontData.win32_new(&logFont, device.computePoints(&logFont, handle))];
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200 }
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201
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202 /**
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203 * Returns an integer hash code for the receiver. Any two
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204 * objects that return <code>true</code> when passed to
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205 * <code>equals</code> must return the same value for this
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206 * method.
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207 *
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208 * @return the receiver's hash
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209 *
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210 * @see #equals
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211 */
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212 override public hash_t toHash () {
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213 return cast(hash_t)handle;
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214 }
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215
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216 void init_ (FontData fd) {
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217 if (fd is null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
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218 LOGFONT* logFont = &fd.data;
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219 int lfHeight = logFont.lfHeight;
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220 logFont.lfHeight = device.computePixels(fd.height);
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221 handle = OS.CreateFontIndirect(logFont);
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222 logFont.lfHeight = lfHeight;
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223 if (handle is null) SWT.error(SWT.ERROR_NO_HANDLES);
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224 }
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225
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226 /**
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227 * Returns <code>true</code> if the font has been disposed,
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228 * and <code>false</code> otherwise.
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229 * <p>
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230 * This method gets the dispose state for the font.
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231 * When a font has been disposed, it is an error to
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232 * invoke any other method using the font.
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233 *
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234 * @return <code>true</code> when the font is disposed and <code>false</code> otherwise
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235 */
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236 override public bool isDisposed() {
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237 return handle is null;
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238 }
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239
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240 /**
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241 * Returns a string containing a concise, human-readable
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242 * description of the receiver.
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243 *
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244 * @return a string representation of the receiver
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245 */
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246 override public String toString () {
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247 if (isDisposed()) return "Font {*DISPOSED*}";
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248 return Format( "Font {{{}}", handle );
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249 //
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250 // LOGFONT logFont;
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251 // OS.GetObject(handle, LOGFONT.sizeof, &logFont);
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252 // char[] name = .TCHARzToStr( logFont.lfFaceName.ptr, -1 );
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253 //
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254 // return Format( "Font {{{}, {}}", handle, name );
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255 }
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256
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257 /**
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258 * Invokes platform specific functionality to allocate a new font.
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259 * <p>
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260 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
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261 * API for <code>Font</code>. It is marked public only so that it
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262 * can be shared within the packages provided by SWT. It is not
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263 * available on all platforms, and should never be called from
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264 * application code.
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265 * </p>
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266 *
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267 * @param device the device on which to allocate the color
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268 * @param handle the handle for the font
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269 * @return a new font object containing the specified device and handle
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270 */
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271 public static Font win32_new(Device device, HFONT handle) {
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272 Font font = new Font(device);
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273 font.disposeChecking = false;
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274 font.handle = handle;
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275 return font;
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276 }
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277
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278 }