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annotate dwt/internal/Callback.d @ 15:2952d5604c0a

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Ported some widgets, added some stuff to the runtime bindings
author Jacob Carlborg <doob@me.com> <jacob.carlborg@gmail.com>
date Fri, 29 Aug 2008 21:46:05 +0200
parents f565d3a95c0a
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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.internal.Callback;
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17 import dwt.internal.C;
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18
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19 /**
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20 * Instances of this class represent entry points into Java
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21 * which can be invoked from operating system level callback
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22 * routines.
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23 * <p>
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24 * IMPORTANT: A callback is only valid when invoked on the
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25 * thread which created it. The results are undefined (and
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26 * typically bad) when a callback is passed out to the
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27 * operating system (or other code) in such a way that the
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28 * callback is called from a different thread.
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29 */
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31 public class Callback {
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32
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33 Object object;
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34 String method, signature;
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35 int argCount;
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36 int /*long*/ address, errorResult;
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37 boolean isStatic, isArrayBased;
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38
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39 static final String PTR_SIGNATURE = C.PTR_SIZEOF == 4 ? "I" : "J"; //$NON-NLS-1$ //$NON-NLS-2$
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40 static final String SIGNATURE_0 = getSignature(0);
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41 static final String SIGNATURE_1 = getSignature(1);
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42 static final String SIGNATURE_2 = getSignature(2);
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43 static final String SIGNATURE_3 = getSignature(3);
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44 static final String SIGNATURE_4 = getSignature(4);
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45 static final String SIGNATURE_N = "(["+PTR_SIGNATURE+")"+PTR_SIGNATURE; //$NON-NLS-1$ //$NON-NLS-2$
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47 /**
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48 * Constructs a new instance of this class given an object
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49 * to send the message to, a string naming the method to
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50 * invoke and an argument count. Note that, if the object
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51 * is an instance of <code>Class</code> it is assumed that
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52 * the method is a static method on that class.
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53 *
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54 * @param object the object to send the message to
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55 * @param method the name of the method to invoke
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56 * @param argCount the number of arguments that the method takes
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57 */
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58 public this (Object object, String method, int argCount) {
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59 this (object, method, argCount, false);
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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 an object
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64 * to send the message to, a string naming the method to
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65 * invoke, an argument count and a flag indicating whether
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66 * or not the arguments will be passed in an array. Note
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67 * that, if the object is an instance of <code>Class</code>
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68 * it is assumed that the method is a static method on that
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69 * class.
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70 *
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71 * @param object the object to send the message to
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72 * @param method the name of the method to invoke
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73 * @param argCount the number of arguments that the method takes
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74 * @param isArrayBased <code>true</code> if the arguments should be passed in an array and false otherwise
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75 */
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76 public this (Object object, String method, int argCount, boolean isArrayBased) {
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77 this (object, method, argCount, isArrayBased, 0);
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78 }
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79
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80 /**
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81 * Constructs a new instance of this class given an object
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82 * to send the message to, a string naming the method to
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83 * invoke, an argument count, a flag indicating whether
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84 * or not the arguments will be passed in an array and a value
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85 * to return when an exception happens. Note that, if
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86 * the object is an instance of <code>Class</code>
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87 * it is assumed that the method is a static method on that
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88 * class.
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89 *
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90 * @param object the object to send the message to
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91 * @param method the name of the method to invoke
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92 * @param argCount the number of arguments that the method takes
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93 * @param isArrayBased <code>true</code> if the arguments should be passed in an array and false otherwise
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94 * @param errorResult the return value if the java code throws an exception
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95 */
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96 public this (Object object, String method, int argCount, boolean isArrayBased, int /*long*/ errorResult) {
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97
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98 /* Set the callback fields */
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99 this.object = object;
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100 this.method = method;
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101 this.argCount = argCount;
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102 this.isStatic = cast(ClassInfo) object;
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103 this.isArrayBased = isArrayBased;
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104 this.errorResult = errorResult;
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105
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106 /* Inline the common cases */
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107 if (isArrayBased) {
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108 signature = SIGNATURE_N;
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109 } else {
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110 switch (argCount) {
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111 case 0: signature = SIGNATURE_0; break; //$NON-NLS-1$
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112 case 1: signature = SIGNATURE_1; break; //$NON-NLS-1$
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113 case 2: signature = SIGNATURE_2; break; //$NON-NLS-1$
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114 case 3: signature = SIGNATURE_3; break; //$NON-NLS-1$
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115 case 4: signature = SIGNATURE_4; break; //$NON-NLS-1$
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116 default:
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117 signature = getSignature(argCount);
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118 }
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119 }
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120
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121 /* Bind the address */
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122 address = bind (this, object, method, signature, argCount, isStatic, isArrayBased, errorResult);
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123 }
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124
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125 /**
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126 * Allocates the native level resources associated with the
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127 * callback. This method is only invoked from within the
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128 * constructor for the argument.
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129 *
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130 * @param callback the callback to bind
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131 * @param object the callback's object
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132 * @param method the callback's method
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133 * @param signature the callback's method signature
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134 * @param argCount the callback's method argument count
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135 * @param isStatic whether the callback's method is static
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136 * @param isArrayBased whether the callback's method is array based
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137 * @param errorResult the callback's error result
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138 */
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139 static synchronized int /*long*/ bind (Callback callback, Object object, String method, String signature, int argCount, boolean isStatic, boolean isArrayBased, int /*long*/ errorResult)
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140 {
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141 return c.bind(callback, object, method, signature, argCount, isStatic, isArrayBased, errorResult);
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142 }
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143
1
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144 /**
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145 * Releases the native level resources associated with the callback,
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146 * and removes all references between the callback and
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147 * other objects. This helps to prevent (bad) application code
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148 * from accidentally holding onto extraneous garbage.
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149 */
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150 public void dispose () {
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151 if (object is null) return;
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152 unbind (this);
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153 object = method = signature = null;
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154 address = 0;
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155 }
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156
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157 /**
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158 * Returns the address of a block of machine code which will
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159 * invoke the callback represented by the receiver.
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160 *
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161 * @return the callback address
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162 */
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163 public int /*long*/ getAddress () {
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164 return address;
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165 }
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166
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167 /**
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168 * Returns the SWT platform name.
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169 *
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170 * @return the platform name of the currently running SWT
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171 */
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172 public static String getPlatform ();
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173
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174 /**
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175 * Returns the number of times the system has been recursively entered
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176 * through a callback.
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177 * <p>
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178 * Note: This should not be called by application code.
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179 * </p>
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180 *
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181 * @return the entry count
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182 *
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183 * @since 2.1
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184 */
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185 public static int getEntryCount ()
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186 {
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187 return c.getEntryCount;
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188 }
0
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189
1
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190 static String getSignature(int argCount) {
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191 String signature = "("; //$NON-NLS-1$
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192 for (int i = 0; i < argCount; i++) signature = PTR_SIGNATURE;
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193 signature += ")" ~ PTR_SIGNATURE; //$NON-NLS-1$
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194 return signature;
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195 }
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196
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197 /**
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198 * Indicates whether or not callbacks which are triggered at the
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199 * native level should cause the messages described by the matching
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200 * <code>Callback</code> objects to be invoked. This method is used
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201 * to safely shut down SWT when it is run within environments
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202 * which can generate spurious events.
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203 * <p>
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204 * Note: This should not be called by application code.
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205 * </p>
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206 *
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207 * @param enable true if callbacks should be invoked
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208 */
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209 public static final synchronized void setEnabled (boolean enable)
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210 {
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211 return c.setEnabled(enable);
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212 }
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213
1
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214 /**
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215 * Returns whether or not callbacks which are triggered at the
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216 * native level should cause the messages described by the matching
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217 * <code>Callback</code> objects to be invoked. This method is used
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218 * to safely shut down SWT when it is run within environments
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219 * which can generate spurious events.
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220 * <p>
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221 * Note: This should not be called by application code.
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222 * </p>
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223 *
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224 * @return true if callbacks should not be invoked
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225 */
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226 public static final synchronized boolean getEnabled ()
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227 {
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228 return c.getEnabled;
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229 }
1
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230
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231 /**
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232 * This might be called directly from native code in environments
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233 * which can generate spurious events. Check before removing it.
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234 *
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235 * @deprecated
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236 *
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237 * @param ignore true if callbacks should not be invoked
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238 */
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239 static final void ignoreCallbacks (boolean ignore) {
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240 setEnabled (!ignore);
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241 }
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242
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243 /**
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244 * Immediately wipes out all native level state associated
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245 * with <em>all</em> callbacks.
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246 * <p>
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247 * <b>WARNING:</b> This operation is <em>extremely</em> dangerous,
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248 * and should never be performed by application code.
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249 * </p>
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250 */
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251 public static final synchronized void reset ();
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252
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253 /**
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254 * Releases the native level resources associated with the callback.
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255 *
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256 * @see #dispose
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257 */
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258 static final synchronized void unbind (Callback callback)
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259 {
a329f9c3d66d Ported dwt.internal.cocoa.SWT* again
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260 c.unbind(callback);
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261 }
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262
0
380af2bdd8e5 Upload of whole dwt tree
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263 }