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

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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, 2005 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.FocusTraverseManager;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.dwtxhelper.Collection;
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17 import dwtx.draw2d.IFigure;
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18
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19 /**
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20 * This class is a helper to the {@link SWTEventDispatcher}. It handles the task of
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21 * determining which Figure will gain focus upon a tab/shift-tab. It also keeps track of
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22 * the Figure with current focus.
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23 * <p>
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24 * Note: When a Canvas with a {@link LightweightSystem} gains focus, it gives focus to the
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25 * child Figure who had focus when this Canvas lost focus. If the canvas is gaining focus
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26 * for the first time, focus is given to its first child Figure.
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27 */
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28 public class FocusTraverseManager {
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29
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30 IFigure currentFocusOwner;
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31
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32 /**
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33 * Default constructor.
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34 */
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35 public this() { }
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36
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37 private IFigure findDeepestRightmostChildOf(IFigure fig) {
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38 while (fig.getChildren().size() !is 0) {
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39 fig = cast(IFigure)fig.getChildren().get(fig.getChildren().size() - 1);
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40 }
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41 return fig;
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42 }
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43
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44 /**
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45 * Returns the IFigure that will receive focus upon a 'tab' traverse event.
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46 *
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47 * @param root the {@link LightweightSystem LightweightSystem's} root figure
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48 * @param prevFocus the IFigure who currently owns focus
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49 * @return the next focusable figure
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50 */
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51 public IFigure getNextFocusableFigure(IFigure root, IFigure prevFocus) {
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52 bool found = false;
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53 IFigure nextFocus = prevFocus;
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54
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55 /*
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56 * If no Figure currently has focus, apply focus to root's first focusable child.
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57 */
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58 if (prevFocus is null) {
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59 if (root.getChildren().size() !is 0) {
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60 nextFocus = (cast(IFigure)root.getChildren().get(0));
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61 if (isFocusEligible(nextFocus))
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62 return nextFocus;
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63 } else
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64 return null;
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65 }
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66
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67 int siblingPos = nextFocus.getParent().getChildren().indexOf(cast(Object)nextFocus);
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68 while (!found) {
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69 IFigure parent = nextFocus.getParent();
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70
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71 /*
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72 * Figure traversal is implemented using the pre-order left to right
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73 * tree traversal algorithm.
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74 *
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75 * If the focused sibling has children, traverse to its leftmost child.
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76 * If the focused sibling has no children, traverse to the sibling
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77 * to its right.
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78 * If there is no sibling to the right, go up the tree until a node
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79 * with un-traversed siblings is found.
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80 */
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81 List siblings = parent.getChildren();
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82
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83 if (nextFocus.getChildren().size() !is 0) {
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84 nextFocus = cast(IFigure)nextFocus.getChildren().get(0);
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85 siblingPos = 0;
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86 if (isFocusEligible(nextFocus))
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87 found = true;
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88 } else if (siblingPos < siblings.size() - 1) {
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89 nextFocus = (cast(IFigure)(siblings.get(++siblingPos)));
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90 if (isFocusEligible(nextFocus))
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91 found = true;
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92 } else {
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93 bool untraversedSiblingFound = false;
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94 while (!untraversedSiblingFound) {
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95 IFigure p = nextFocus.getParent();
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96 IFigure gp = p.getParent();
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97
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98 if (gp !is null) {
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99 int parentSiblingCount = gp.getChildren().size();
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100 int parentIndex = gp.getChildren().indexOf(cast(Object)p);
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101 if (parentIndex < parentSiblingCount - 1) {
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102 nextFocus = (cast(IFigure)p.getParent()
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103 .getChildren().get(parentIndex + 1));
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104 siblingPos = parentIndex + 1;
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105 untraversedSiblingFound = true;
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106 if (isFocusEligible(nextFocus))
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107 found = true;
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108 } else
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109 nextFocus = p;
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110 } else {
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111 nextFocus = null;
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112 untraversedSiblingFound = true;
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113 found = true;
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114 }
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115 }
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116 }
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117 }
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118 return nextFocus;
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119 }
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120
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121 /**
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122 * Returns the IFigure that will receive focus upon a 'shift-tab' traverse event.
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123 *
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124 * @param root The {@link LightweightSystem LightweightSystem's} root figure
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125 * @param prevFocus The IFigure who currently owns focus
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126 * @return the previous focusable figure
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127 */
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128 public IFigure getPreviousFocusableFigure(IFigure root, IFigure prevFocus) {
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129 if (prevFocus is null)
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130 return null;
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131
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132 bool found = false;
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133 IFigure nextFocus = prevFocus;
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134 while (!found) {
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135 IFigure parent = nextFocus.getParent();
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136
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137 /*
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138 * At root, return null to indicate traversal
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139 * is complete.
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140 */
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141 if (parent is null)
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142 return null;
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143
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144 List siblings = parent.getChildren();
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145 int siblingPos = siblings.indexOf(cast(Object)nextFocus);
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146
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147 /*
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148 * Figure traversal is implemented using the post-order right to left
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149 * tree traversal algorithm.
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150 *
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151 * Find the rightmost child.
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152 * If this child is focusable, return it
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153 * If not focusable, traverse to its sibling and repeat.
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154 * If there is no sibling, traverse its parent.
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155 */
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156 if (siblingPos !is 0) {
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157 IFigure child =
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158 findDeepestRightmostChildOf(cast(IFigure)siblings.get(siblingPos - 1));
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159 if (isFocusEligible(child)) {
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160 found = true;
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161 nextFocus = child;
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162 } else if ((cast(Object)child).opEquals(cast(Object)nextFocus)) {
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163 if (isFocusEligible(nextFocus))
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164 found = true;
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165 } else
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166 nextFocus = child;
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167 } else {
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168 nextFocus = parent;
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169 if (isFocusEligible(nextFocus))
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170 found = true;
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171 }
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172 }
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173 return nextFocus;
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174 }
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175
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176 /**
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177 * @return the figure that currently has focus
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178 */
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179 public IFigure getCurrentFocusOwner() {
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180 return currentFocusOwner;
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181 }
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182
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183 private bool isFocusEligible(IFigure fig) {
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184 return (fig !is null && fig.isFocusTraversable() && fig.isShowing());
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185 }
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186
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187 /**
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188 * Sets the currently focused figure.
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189 * @param fig the figure to get focus
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190 */
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191 public void setCurrentFocusOwner(IFigure fig) {
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192 currentFocusOwner = fig;
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193 }
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194
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195 }