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1 /*******************************************************************************
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2 * Copyright (c) 2006, 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 *******************************************************************************/
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11 module org.eclipse.jface.internal.databinding.provisional.swt.SWTUtil;
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12
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13 import java.lang.all;
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14
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15 import java.util.HashMap;
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16 import java.util.Map;
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17
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18 import org.eclipse.jface.util.SafeRunnable;
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19 import org.eclipse.swt.graphics.RGB;
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20 import org.eclipse.swt.widgets.Display;
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21
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22 /**
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23 * NON-API - Utility methods, mainly having to do with posting runnables to the UI thread
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24 * in a particular way.
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25 * @since 1.1
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26 *
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27 */
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28 public class SWTUtil {
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29 /**
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30 * Stores a work queue for each display
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31 */
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32 private static Map mapDisplayOntoWorkQueue = new HashMap();
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33
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34 private this() {
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35 }
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36
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37 /**
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38 * Runs the given runnable on the given display as soon as possible. If
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39 * possible, the runnable will be executed before the next widget is
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40 * repainted, but this behavior is not guaranteed. Use this method to
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41 * schedule work will affect the way one or more widgets are drawn.
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42 *
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43 * <p>
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44 * This is threadsafe.
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45 * </p>
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46 *
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47 * @param d
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48 * display
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49 * @param r
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50 * runnable to execute in the UI thread.
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51 */
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52 public static void greedyExec(Display d, Runnable r) {
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53 if (d.isDisposed()) {
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54 return;
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55 }
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56
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57 // if (Display.getCurrent() is d) {
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58 // r.run();
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59 // } else {
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60 WorkQueue queue = getQueueFor(d);
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61 queue.asyncExec(r);
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62 // }
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63 }
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64
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65 /**
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66 * Runs the given runnable on the given display as soon as possible. Unlike
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67 * greedyExec, this has no effect if the given runnable has already been
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68 * scheduled for execution. Use this method to schedule work that will
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69 * affect the way one or more wigdets are drawn, but that should only happen
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70 * once.
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71 *
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72 * <p>
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73 * This is threadsafe.
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74 * </p>
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75 *
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76 * @param d
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77 * display
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78 * @param r
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79 * runnable to execute in the UI thread. Has no effect if the
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80 * given runnable has already been scheduled but has not yet run.
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81 */
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82 public static void runOnce(Display d, Runnable r) {
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83 if (d.isDisposed()) {
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84 return;
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85 }
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86 WorkQueue queue = getQueueFor(d);
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87 queue.runOnce(r);
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88 }
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89
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90 /**
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91 * Cancels a greedyExec or runOnce that was previously scheduled on the
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92 * given display. Has no effect if the given runnable is not in the queue
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93 * for the given display
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94 *
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95 * @param d
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96 * target display
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97 * @param r
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98 * runnable to execute
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99 */
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100 public static void cancelExec(Display d, Runnable r) {
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101 if (d.isDisposed()) {
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102 return;
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103 }
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104 WorkQueue queue = getQueueFor(d);
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105 queue.cancelExec(r);
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106 }
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107
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108 /**
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109 * Returns the work queue for the given display. Creates a work queue if
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110 * none exists yet.
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111 *
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112 * @param d
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113 * display to return queue for
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114 * @return a work queue (never null)
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115 */
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116 private static WorkQueue getQueueFor(Display d) {
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117 WorkQueue result;
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118 synchronized (mapDisplayOntoWorkQueue) {
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119 // Look for existing queue
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120 result = cast(WorkQueue) mapDisplayOntoWorkQueue.get(d);
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121
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122 if (result is null) {
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123 // If none, create new queue
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124 result = new WorkQueue(d);
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125 final WorkQueue q = result;
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126 mapDisplayOntoWorkQueue.put(d, result);
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127 d.asyncExec(dgRunnable( (Display d_) {
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128 d_.disposeExec(new class() Runnable {
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129 public void run() {
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130 synchronized (mapDisplayOntoWorkQueue) {
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131 q.cancelAll();
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132 mapDisplayOntoWorkQueue.remove(d_);
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133 }
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134 }
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135 });
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136 }, d));
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137 }
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138 return result;
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139 }
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140 }
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141
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142 /**
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143 * @param rgb1
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144 * @param rgb2
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145 * @param ratio
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146 * @return the RGB object
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147 */
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148 public static RGB mix(RGB rgb1, RGB rgb2, double ratio) {
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149 return new RGB(interp(rgb1.red, rgb2.red, ratio),
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150 interp(rgb1.green, rgb2.green, ratio),
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151 interp(rgb1.blue, rgb2.blue, ratio));
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152 }
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153
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154 private static int interp(int i1, int i2, double ratio) {
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155 int result = cast(int)(i1 * ratio + i2 * (1.0 - ratio));
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156 if (result < 0) result = 0;
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157 if (result > 255) result = 255;
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158 return result;
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159 }
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160
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161 /**
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162 * Logs an exception as though it was thrown by a SafeRunnable being run
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163 * with the default ISafeRunnableRunner. Will not open modal dialogs or spin
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164 * the event loop.
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165 *
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166 * @param t
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167 * throwable to log
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168 * @deprecated
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169 * @noreference This method is not intended to be referenced by clients. It
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170 * remains here for API backwards compatibility.
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171 */
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172 public static void logException(Exception t) {
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173 SafeRunnable.run(new class(t) SafeRunnable {
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174 Exception t_;
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175 this(Exception a){ t_=a; }
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176 public void run() {
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177 throw t_;
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178 }
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179 public void handleException(Throwable e) {
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180 // IMPORTANT: Do not call the super implementation, since
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181 // it opens a modal dialog, and may cause *syncExecs to run
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182 // too early.
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183 }
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184 });
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185 }
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186
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187 }
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