annotate dwtx/draw2d/SWTEventDispatcher.d @ 98:95307ad235d9

Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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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 * 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 dwtx.draw2d.SWTEventDispatcher;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwt.DWT;
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18 import dwt.accessibility.AccessibleControlEvent;
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19 import dwt.accessibility.AccessibleControlListener;
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20 import dwt.accessibility.AccessibleEvent;
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21 import dwt.accessibility.AccessibleListener;
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22 import dwt.events.DisposeEvent;
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23 import dwt.events.TraverseEvent;
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24 import dwt.graphics.Cursor;
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25 import dwt.widgets.Control;
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26 import dwtx.draw2d.EventDispatcher;
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27 import dwtx.draw2d.IFigure;
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28 import dwtx.draw2d.Figure;
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29 import dwtx.draw2d.MouseEvent;
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30 import dwtx.draw2d.FocusEvent;
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31 import dwtx.draw2d.KeyEvent;
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32 import dwtx.draw2d.ToolTipHelper;
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33 static import dwt.widgets.Control;
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34 import dwtx.draw2d.FocusTraverseManager;
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35 static import dwt.events.FocusEvent;
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36 static import dwt.events.KeyEvent;
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37 static import dwt.events.MouseEvent;
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38
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39 /**
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40 * The SWTEventDispatcher provides draw2d with the ability to dispatch DWT Events. The
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41 * {@link dwtx.draw2d.LightweightSystem} adds DWT event listeners on its Canvas.
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42 * When the Canvas receives an DWT event, it calls the appropriate dispatcher method in
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43 * SWTEventDispatcher.
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44 */
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45 public class SWTEventDispatcher
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46 : EventDispatcher
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47 {
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48
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49 /**
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50 * Used to tell if any button is pressed without regard to the specific button.
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51 * @deprecated Use {@link DWT#BUTTON_MASK} instead.
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52 */
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53 protected static const int ANY_BUTTON = DWT.BUTTON_MASK;
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54
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55 private bool figureTraverse = true;
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56
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57 private bool captured;
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58 private IFigure root;
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59 private IFigure mouseTarget;
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60 private IFigure cursorTarget;
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61 private IFigure focusOwner;
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62 private IFigure hoverSource;
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63
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64 private MouseEvent currentEvent;
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65 private Cursor cursor;
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66 /** The control this dispatcher is listening to. */
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67 protected dwt.widgets.Control.Control control;
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68
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69 private ToolTipHelper toolTipHelper;
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70 private FocusTraverseManager focusManager;
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71
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72 /**
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73 * Implements {@link EventDispatcher.AccessibilityDispatcher} but
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74 * does nothing in the implementation.
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75 */
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76 protected class FigureAccessibilityDispatcher
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77 : AccessibilityDispatcher
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78 {
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79 /** @see AccessibleControlListener#getChildAtPoint(AccessibleControlEvent) */
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80 public void getChildAtPoint(AccessibleControlEvent e) { }
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81 /** @see AccessibleControlListener#getChildCount(AccessibleControlEvent) */
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82 public void getChildCount(AccessibleControlEvent e) { }
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83 /** @see AccessibleControlListener#getChildren(AccessibleControlEvent) */
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84 public void getChildren(AccessibleControlEvent e) { }
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85 /** @see AccessibleControlListener#getDefaultAction(AccessibleControlEvent) */
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86 public void getDefaultAction(AccessibleControlEvent e) { }
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87 /** @see AccessibleListener#getDescription(AccessibleEvent) */
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88 public void getDescription(AccessibleEvent e) { }
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89 /** @see AccessibleControlListener#getFocus(AccessibleControlEvent) */
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90 public void getFocus(AccessibleControlEvent e) { }
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91 /** @see AccessibleListener#getHelp(AccessibleEvent) */
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92 public void getHelp(AccessibleEvent e) { }
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93 /** @see AccessibleListener#getKeyboardShortcut(AccessibleEvent) */
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94 public void getKeyboardShortcut(AccessibleEvent e) { }
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95 /** @see AccessibleControlListener#getLocation(AccessibleControlEvent) */
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96 public void getLocation(AccessibleControlEvent e) { }
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97 /** @see AccessibleListener#getName(AccessibleEvent) */
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98 public void getName(AccessibleEvent e) { }
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99 /** @see AccessibleControlListener#getRole(AccessibleControlEvent) */
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100 public void getRole(AccessibleControlEvent e) { }
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101 /** @see AccessibleControlListener#getSelection(AccessibleControlEvent) */
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102 public void getSelection(AccessibleControlEvent e) { }
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103 /** @see AccessibleControlListener#getState(AccessibleControlEvent) */
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104 public void getState(AccessibleControlEvent e) { }
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105 /** @see AccessibleControlListener#getValue(AccessibleControlEvent) */
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106 public void getValue(AccessibleControlEvent e) { }
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107 }
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108
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109 public this(){
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110 focusManager = new FocusTraverseManager();
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111 }
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112
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113 /**
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114 * @see EventDispatcher#dispatchFocusGained(dwt.events.FocusEvent)
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115 */
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116 public void dispatchFocusGained(dwt.events.FocusEvent.FocusEvent e) {
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117 IFigure currentFocusOwner = getFocusTraverseManager().getCurrentFocusOwner();
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118
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119 /*
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120 * Upon focus gained, if there is no current focus owner,
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121 * set focus on first focusable child.
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122 */
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123 if (currentFocusOwner is null)
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124 currentFocusOwner =
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125 getFocusTraverseManager().getNextFocusableFigure(root, focusOwner);
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126 setFocus(currentFocusOwner);
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127 }
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128
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129 /**
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130 * @see EventDispatcher#dispatchFocusLost(dwt.events.FocusEvent)
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131 */
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132 public void dispatchFocusLost(dwt.events.FocusEvent.FocusEvent e) {
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133 setFocus(null);
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134 }
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135
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136 /**
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137 * @see EventDispatcher#dispatchKeyPressed(dwt.events.KeyEvent)
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138 */
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139 public void dispatchKeyPressed(dwt.events.KeyEvent.KeyEvent e) {
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140 if (focusOwner !is null) {
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141 KeyEvent event = new KeyEvent(this, focusOwner, e);
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142 focusOwner.handleKeyPressed(event);
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143 }
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144 }
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145
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146 /**
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147 * @see EventDispatcher#dispatchKeyReleased(dwt.events.KeyEvent)
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148 */
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149 public void dispatchKeyReleased(dwt.events.KeyEvent.KeyEvent e) {
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150 if (focusOwner !is null) {
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151 KeyEvent event = new KeyEvent(this, focusOwner, e);
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152 focusOwner.handleKeyReleased(event);
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153 }
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154 }
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155
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156 /**
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157 * @see EventDispatcher#dispatchKeyTraversed(TraverseEvent)
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158 */
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159 public void dispatchKeyTraversed(TraverseEvent e) {
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160 if (!figureTraverse)
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161 return;
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162 IFigure nextFigure = null;
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163
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164 if (e.detail is DWT.TRAVERSE_TAB_NEXT)
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165 nextFigure = getFocusTraverseManager().getNextFocusableFigure(root, focusOwner);
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166 else if (e.detail is DWT.TRAVERSE_TAB_PREVIOUS)
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167 nextFigure =
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168 getFocusTraverseManager().getPreviousFocusableFigure(root, focusOwner);
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169
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170 if (nextFigure !is null) {
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171 e.doit = false;
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172 setFocus(nextFigure);
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173 }
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174 }
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175
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176 /**
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177 * @see EventDispatcher#dispatchMouseHover(dwt.events.MouseEvent)
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178 */
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179 public void dispatchMouseHover(dwt.events.MouseEvent.MouseEvent me) {
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180 receive(me);
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181 if (mouseTarget !is null)
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182 mouseTarget.handleMouseHover(currentEvent);
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183 /*
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184 * Check Tooltip source.
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185 * Get Tooltip source's Figure.
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186 * Set that tooltip as the lws contents on the helper.
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187 */
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188 if (hoverSource !is null) {
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189 toolTipHelper = getToolTipHelper();
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190 IFigure tip = hoverSource.getToolTip();
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191 Control control = cast(Control)me.getSource();
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192 dwt.graphics.Point.Point absolute;
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193 absolute = control.toDisplay(new dwt.graphics.Point.Point(me.x, me.y));
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194 toolTipHelper.displayToolTipNear(hoverSource, tip, absolute.x, absolute.y);
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195 }
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196 }
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197
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198 /**
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199 * @see EventDispatcher#dispatchMouseDoubleClicked(dwt.events.MouseEvent)
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200 */
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201 public void dispatchMouseDoubleClicked(dwt.events.MouseEvent.MouseEvent me) {
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202 receive(me);
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203 if (mouseTarget !is null)
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204 mouseTarget.handleMouseDoubleClicked(currentEvent);
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205 }
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206
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207 /**
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208 * @see EventDispatcher#dispatchMouseEntered(dwt.events.MouseEvent)
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209 */
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210 public void dispatchMouseEntered(dwt.events.MouseEvent.MouseEvent me) {
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211 receive(me);
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212 }
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213
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214 /**
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215 * @see EventDispatcher#dispatchMouseExited(dwt.events.MouseEvent)
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216 */
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217 public void dispatchMouseExited(dwt.events.MouseEvent.MouseEvent me) {
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218 setHoverSource(null, me);
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219 if (mouseTarget !is null) {
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220 currentEvent =
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221 new MouseEvent(me.x, me.y, this, mouseTarget, me.button, me.stateMask);
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222 mouseTarget.handleMouseExited(currentEvent);
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223 releaseCapture();
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224 mouseTarget = null;
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225 }
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226 }
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227
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228 /**
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229 * @see EventDispatcher#dispatchMousePressed(dwt.events.MouseEvent)
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230 */
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231 public void dispatchMousePressed(dwt.events.MouseEvent.MouseEvent me) {
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232 receive(me);
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233 if (mouseTarget !is null) {
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234 mouseTarget.handleMousePressed(currentEvent);
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235 if (currentEvent.isConsumed())
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236 setCapture(mouseTarget);
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237 }
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238 }
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239
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240 /**
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241 * @see EventDispatcher#dispatchMouseMoved(dwt.events.MouseEvent)
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242 */
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243 public void dispatchMouseMoved(dwt.events.MouseEvent.MouseEvent me) {
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244 receive(me);
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245 if (mouseTarget !is null) {
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246 if ((me.stateMask & DWT.BUTTON_MASK) !is 0)
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247 mouseTarget.handleMouseDragged(currentEvent);
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248 else
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249 mouseTarget.handleMouseMoved(currentEvent);
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250 }
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251 }
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252
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253 /**
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254 * @see EventDispatcher#dispatchMouseReleased(dwt.events.MouseEvent)
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255 */
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256 public void dispatchMouseReleased(dwt.events.MouseEvent.MouseEvent me) {
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257 receive(me);
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258 if (mouseTarget !is null) {
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259 mouseTarget.handleMouseReleased(currentEvent);
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260 }
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261 releaseCapture();
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262 receive(me);
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263 }
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264
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265 /**
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266 * @see EventDispatcher#getAccessibilityDispatcher()
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267 */
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268 protected AccessibilityDispatcher getAccessibilityDispatcher() {
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269 return null;
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270 }
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271
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272 /**
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273 * Returns the current mouse event.
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274 * @return the current mouse event; can be <code>null</code>
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275 */
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276 protected MouseEvent getCurrentEvent() {
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277 return currentEvent;
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278 }
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279
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280 private IFigure getCurrentToolTip() {
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281 if (hoverSource !is null)
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282 return hoverSource.getToolTip();
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283 else
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284 return null;
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285 }
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286
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287 /**
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288 * Returns the figure that the cursor is over.
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289 * @return the cursor target
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290 */
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291 protected IFigure getCursorTarget() {
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292 return cursorTarget;
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293 }
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294
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295 /**
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296 * Returns the ToolTipHelper used to display tooltips on hover events.
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297 * @return the ToolTipHelper
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298 */
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299 protected ToolTipHelper getToolTipHelper() {
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300 if (toolTipHelper is null)
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301 toolTipHelper = new ToolTipHelper(control);
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302 return toolTipHelper;
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303 }
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304
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305 /**
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parents:
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306 * Returns the FocusTraverseManager which is used to determine which figure will get focus
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307 * when a TAB or ALT+TAB key sequence occurs.
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308 * @return the FocusTraverseManager
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parents:
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309 */
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diff changeset
310 protected final FocusTraverseManager getFocusTraverseManager() {
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parents:
diff changeset
311 if (focusManager is null) {
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diff changeset
312 focusManager = new FocusTraverseManager();
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313 }
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diff changeset
314 return focusManager;
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315 }
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316
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317 /**
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318 * @see EventDispatcher#getFocusOwner()
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319 */
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320 /*package*/ IFigure getFocusOwner() {
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321 return focusOwner;
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322 }
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323
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324 /**
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325 * Returns the figure that is the target of mouse events. This may not be the figure
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parents:
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326 * beneath the cursor because another figure may have captured the mouse and will continue
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327 * to get mouse events until capture is released.
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328 * @return the mouse target
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329 */
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330 protected IFigure getMouseTarget() {
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331 return mouseTarget;
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332 }
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333
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334 /**
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parents:
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335 * Returns the root figure for this dispatcher.
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336 * @return the root figure
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337 */
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338 protected IFigure getRoot() {
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339 return root;
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340 }
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341
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342 /**
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343 * @see EventDispatcher#isCaptured()
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344 */
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345 public bool isCaptured() {
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346 return captured;
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347 }
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348
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349 private void receive(dwt.events.MouseEvent.MouseEvent me) {
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350 currentEvent = null;
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351 updateFigureUnderCursor(me);
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352 int state = me.stateMask;
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353 if (captured) {
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354 if (mouseTarget !is null)
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355 currentEvent = new MouseEvent(me.x, me.y, this, mouseTarget, me.button, state);
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356 } else {
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357 IFigure f = root.findMouseEventTargetAt(me.x, me.y);
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358 if (f is mouseTarget) {
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359 if (mouseTarget !is null)
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360 currentEvent =
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361 new MouseEvent(me.x, me.y, this, mouseTarget, me.button, state);
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362 return;
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363 }
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364 if (mouseTarget !is null) {
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365 currentEvent = new MouseEvent(me.x, me.y, this, mouseTarget, me.button, state);
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366 mouseTarget.handleMouseExited(currentEvent);
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367 }
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368 setMouseTarget(f);
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369 if (mouseTarget !is null) {
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370 currentEvent = new MouseEvent(me.x, me.y, this, mouseTarget, me.button, state);
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371 mouseTarget.handleMouseEntered(currentEvent);
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372 }
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373 }
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374 }
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375
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376 /**
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parents:
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377 * @see EventDispatcher#releaseCapture()
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378 */
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379 protected void releaseCapture() {
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380 captured = false;
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381 }
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382
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parents:
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383 /**
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parents:
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384 * @see EventDispatcher#requestFocus(IFigure)
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parents:
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385 */
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386 public void requestFocus(IFigure fig) {
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387 setFocus(fig);
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parents:
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388 }
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diff changeset
389
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parents:
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390 /**
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parents:
diff changeset
391 * @see EventDispatcher#requestRemoveFocus(IFigure)
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parents:
diff changeset
392 */
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diff changeset
393 public void requestRemoveFocus(IFigure fig) {
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parents:
diff changeset
394 if (getFocusOwner() is fig)
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parents:
diff changeset
395 setFocus(null);
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parents:
diff changeset
396 if (mouseTarget is fig)
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diff changeset
397 mouseTarget = null;
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parents:
diff changeset
398 if (cursorTarget is fig)
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parents:
diff changeset
399 cursorTarget = null;
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parents:
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400 if (hoverSource is fig)
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parents:
diff changeset
401 hoverSource = null;
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parents:
diff changeset
402 getFocusTraverseManager().setCurrentFocusOwner(null);
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parents:
diff changeset
403 }
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parents:
diff changeset
404
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parents:
diff changeset
405 /**
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parents:
diff changeset
406 * @see EventDispatcher#setCapture(IFigure)
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parents:
diff changeset
407 */
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parents:
diff changeset
408 protected void setCapture(IFigure figure) {
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parents:
diff changeset
409 captured = true;
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parents:
diff changeset
410 mouseTarget = figure;
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parents:
diff changeset
411 }
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parents:
diff changeset
412
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parents:
diff changeset
413 /**
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
414 * @see EventDispatcher#setControl(Control)
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parents:
diff changeset
415 */
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parents:
diff changeset
416 public void setControl(Control c) {
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parents:
diff changeset
417 if (c is control)
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parents:
diff changeset
418 return;
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parents:
diff changeset
419 if (control !is null && !control.isDisposed())
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parents:
diff changeset
420 throw new RuntimeException(
95307ad235d9 Added Draw2d code, still work in progress
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parents:
diff changeset
421 "Can not set control again once it has been set"); //$NON-NLS-1$
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parents:
diff changeset
422 if (c !is null)
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parents:
diff changeset
423 c.addDisposeListener(new class() dwt.events.DisposeListener.DisposeListener {
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parents:
diff changeset
424 public void widgetDisposed(DisposeEvent e) {
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parents:
diff changeset
425 if (toolTipHelper !is null)
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parents:
diff changeset
426 toolTipHelper.dispose();
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parents:
diff changeset
427 }
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parents:
diff changeset
428 });
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parents:
diff changeset
429 control = c;
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parents:
diff changeset
430 }
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parents:
diff changeset
431
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parents:
diff changeset
432 /**
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parents:
diff changeset
433 * Sets the mouse cursor.
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parents:
diff changeset
434 * @param c the new cursor
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parents:
diff changeset
435 */
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parents:
diff changeset
436 protected void setCursor(Cursor c) {
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parents:
diff changeset
437 if (c is null && cursor is null) {
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parents:
diff changeset
438 return;
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parents:
diff changeset
439 } else if ((c !is cursor) || (!c.opEquals(cursor))) {
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parents:
diff changeset
440 cursor = c;
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parents:
diff changeset
441 if (control !is null && !control.isDisposed())
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parents:
diff changeset
442 control.setCursor(c);
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parents:
diff changeset
443 }
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parents:
diff changeset
444 }
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parents:
diff changeset
445
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
446 /**
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
447 * Enables key traversal via TAB and ALT+TAB if <i>traverse</i> is <code>true</code>.
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
448 * Disables it otherwise.
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
449 * @param traverse whether key traversal should be enabled
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
450 */
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parents:
diff changeset
451 public void setEnableKeyTraversal(bool traverse) {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
452 figureTraverse = traverse;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
453 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
454
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
455 /**
95307ad235d9 Added Draw2d code, still work in progress
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
456 * Sets the figure under the mouse cursor.
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parents:
diff changeset
457 * @param f the new figure under the cursor
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parents:
diff changeset
458 */
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
459 protected void setFigureUnderCursor(IFigure f) {
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parents:
diff changeset
460 if (cursorTarget is f)
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
461 return;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
462 cursorTarget = f;
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
463 updateCursor();
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
464 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
465
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
466 /**
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
467 * Sets the focus figure. If the figure currently with focus is not <code>null</code>,
95307ad235d9 Added Draw2d code, still work in progress
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
468 * {@link IFigure#handleFocusLost(FocusEvent)} is called on the current focused figure. If
95307ad235d9 Added Draw2d code, still work in progress
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
469 * the new focus figure is not <code>null</code>, this will call
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
470 * {@link IFigure#handleFocusGained(FocusEvent)} on the new focused figure.
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
471 * @param fig the new focus figure
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
472 */
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
473 protected void setFocus(IFigure fig) {
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
474 if (fig is focusOwner)
95307ad235d9 Added Draw2d code, still work in progress
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
475 return;
95307ad235d9 Added Draw2d code, still work in progress
Frank Benoit <benoit@tionex.de>
parents:
diff changeset
476 FocusEvent fe = new FocusEvent(focusOwner, fig);
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477 IFigure oldOwner = focusOwner;
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478 focusOwner = fig;
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479 if (oldOwner !is null)
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480 oldOwner.handleFocusLost(fe);
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481 if (fig !is null)
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482 getFocusTraverseManager().setCurrentFocusOwner(fig);
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483 if (focusOwner !is null)
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484 focusOwner.handleFocusGained(fe);
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485 }
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486
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487 /**
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488 * Sets the figure that the mouse cursor is hovering over.
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489 * @param figure the new hover source
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490 * @param me the mouse event
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491 */
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492 protected void setHoverSource(Figure figure, dwt.events.MouseEvent.MouseEvent me) {
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493 hoverSource = figure;
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494 if (figure !is null) {
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495 Control control = cast(Control)me.getSource();
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496 dwt.graphics.Point.Point absolute;
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497 absolute = control.toDisplay(new dwt.graphics.Point.Point(me.x, me.y));
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498 toolTipHelper = getToolTipHelper();
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499 toolTipHelper.updateToolTip(
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500 hoverSource, getCurrentToolTip(), absolute.x, absolute.y);
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501 } else if (toolTipHelper !is null) {
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502 // Update with null to clear hoverSource in ToolTipHelper
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503 toolTipHelper.updateToolTip(hoverSource, getCurrentToolTip(), me.x, me.y);
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504 }
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505 }
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506
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507 /**
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508 * Sets the given figure to be the target of future mouse events.
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509 * @param figure the new mouse target
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510 */
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511 protected void setMouseTarget(IFigure figure) {
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512 mouseTarget = figure;
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513 }
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514
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515 /**
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516 * @see EventDispatcher#setRoot(IFigure)
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517 */
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518 public void setRoot(IFigure figure) {
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519 root = figure;
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520 }
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521
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522 /**
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523 * @see EventDispatcher#updateCursor()
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524 */
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525 protected void updateCursor() {
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526 Cursor newCursor = null;
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527 if (cursorTarget !is null)
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528 newCursor = cursorTarget.getCursor();
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529 setCursor(newCursor);
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530 }
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531
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532 /**
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533 * Updates the figure under the cursor, unless the mouse is captured, in which case all
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534 * mouse events will be routed to the figure that captured the mouse.
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535 * @param me the mouse event
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536 */
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537 protected void updateFigureUnderCursor(dwt.events.MouseEvent.MouseEvent me) {
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538 if (!captured) {
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539 IFigure f = root.findFigureAt(me.x, me.y);
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540 setFigureUnderCursor(f);
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541 if (cast(Figure)cursorTarget !is hoverSource)
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542 updateHoverSource(me);
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543 }
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544 }
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545
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parents:
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546 /**
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parents:
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547 * Updates the figure that will receive hover events. The hover source must have a
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548 * tooltip. If the figure under the mouse doesn't have a tooltip set, this method will
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parents:
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549 * walk up the ancestor hierarchy until either a figure with a tooltip is found or it
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parents:
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550 * gets to the root figure.
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parents:
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551 * @param me the mouse event
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parents:
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552 */
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553 protected void updateHoverSource(dwt.events.MouseEvent.MouseEvent me) {
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554 /*
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555 * Derive source from figure under cursor.
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556 * Set the source in setHoverSource();
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557 * If figure.getToolTip() is null, get parent's toolTip
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558 * Continue parent traversal until a toolTip is found or root is reached.
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559 */
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parents:
diff changeset
560 if (cursorTarget !is null) {
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diff changeset
561 bool sourceFound = false;
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562 Figure source = cast(Figure)cursorTarget;
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563 while (!sourceFound && source.getParent() !is null) {
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564 if (source.getToolTip() !is null)
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565 sourceFound = true;
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566 else
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567 source = cast(Figure)source.getParent();
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parents:
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568 }
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diff changeset
569 setHoverSource(source, me);
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570 } else {
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571 setHoverSource(null, me);
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572 }
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573 }
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parents:
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574
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parents:
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575 }