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annotate org.eclipse.jface/src/org/eclipse/jface/viewers/CellNavigationStrategy.d @ 12:bc29606a740c

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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 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
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14 module org.eclipse.jface.viewers.CellNavigationStrategy;
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15
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16 import java.lang.all;
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17
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18 import org.eclipse.jface.viewers.ColumnViewer;
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19 import org.eclipse.jface.viewers.ViewerCell;
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20
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21 import org.eclipse.swt.SWT;
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22 import org.eclipse.swt.widgets.Event;
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23
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24 /**
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25 * This class implementation the strategy how the table is navigated using the
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26 * keyboard.
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27 *
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28 * <p>
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29 * <b>Subclasses can implement their custom navigation algorithms</b>
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30 * </p>
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31 *
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32 * @since 3.3
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33 *
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34 */
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35 public class CellNavigationStrategy {
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36 /**
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37 * is the given event an event which moves the selection to another cell
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38 *
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39 * @param viewer
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40 * the viewer we are working for
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41 * @param event
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42 * the key event
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43 * @return <code>true</code> if a new cell is searched
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44 */
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45 public bool isNavigationEvent(ColumnViewer viewer, Event event) {
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46 switch (event.keyCode) {
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47 case SWT.ARROW_UP:
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48 case SWT.ARROW_DOWN:
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49 case SWT.ARROW_LEFT:
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50 case SWT.ARROW_RIGHT:
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51 case SWT.HOME:
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52 case SWT.PAGE_DOWN:
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53 case SWT.PAGE_UP:
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54 case SWT.END:
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55 return true;
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56 default:
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57 return false;
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58 }
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59 }
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60
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61 /**
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62 * @param viewer
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63 * the viewer we are working for
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64 * @param cellToCollapse
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65 * the cell to collapse
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66 * @param event
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67 * the key event
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68 * @return <code>true</code> if this event triggers collapsing of a node
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69 */
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70 public bool isCollapseEvent(ColumnViewer viewer,
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71 ViewerCell cellToCollapse, Event event) {
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72 return false;
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73 }
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74
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75 /**
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76 * @param viewer
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77 * the viewer we are working for
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78 * @param cellToExpand
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79 * the cell to expand
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80 * @param event
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81 * the key event
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82 * @return <code>true</code> if this event triggers expanding of a node
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83 */
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84 public bool isExpandEvent(ColumnViewer viewer, ViewerCell cellToExpand,
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85 Event event) {
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86 return false;
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87 }
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88
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89 /**
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90 * @param viewer
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91 * the viewer working for
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92 * @param cellToExpand
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93 * the cell the user wants to expand
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94 * @param event
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95 * the event triggering the expansion
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96 */
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97 public void expand(ColumnViewer viewer, ViewerCell cellToExpand, Event event) {
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98
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99 }
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100
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101 /**
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102 * @param viewer
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103 * the viewer working for
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104 * @param cellToCollapse
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105 * the cell the user wants to collapse
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106 * @param event
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107 * the event triggering the expansion
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108 */
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109 public void collapse(ColumnViewer viewer, ViewerCell cellToCollapse,
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110 Event event) {
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111
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112 }
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113
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114 /**
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115 * @param viewer
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116 * the viewer we are working for
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117 * @param currentSelectedCell
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118 * the cell currently selected
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119 * @param event
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120 * the key event
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121 * @return the cell which is highlighted next or <code>null</code> if the
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122 * default implementation is taken. E.g. it's fairly impossible to
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123 * react on PAGE_DOWN requests
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124 */
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125 public ViewerCell findSelectedCell(ColumnViewer viewer,
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126 ViewerCell currentSelectedCell, Event event) {
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127
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128 switch (event.keyCode) {
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129 case SWT.ARROW_UP:
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130 if (currentSelectedCell !is null) {
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131 return currentSelectedCell.getNeighbor(ViewerCell.ABOVE, false);
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132 }
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133 break;
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134 case SWT.ARROW_DOWN:
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135 if (currentSelectedCell !is null) {
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136 return currentSelectedCell.getNeighbor(ViewerCell.BELOW, false);
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137 }
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138 break;
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139 case SWT.ARROW_LEFT:
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140 if (currentSelectedCell !is null) {
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141 return currentSelectedCell.getNeighbor(ViewerCell.LEFT, true);
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142 }
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143 break;
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144 case SWT.ARROW_RIGHT:
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145 if (currentSelectedCell !is null) {
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146 return currentSelectedCell.getNeighbor(ViewerCell.RIGHT, true);
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147 }
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148 break;
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149 default:
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150 }
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151
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152 return null;
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153 }
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154
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155 /**
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156 * This method is consulted to decide whether an event has to be canceled or
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157 * not. By default events who collapse/expand tree-nodes are canceled
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158 *
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159 * @param viewer
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160 * the viewer working for
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161 * @param event
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162 * the event
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163 * @return <code>true</code> if the event has to be canceled
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164 */
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165 public bool shouldCancelEvent(ColumnViewer viewer, Event event) {
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166 return event.keyCode is SWT.ARROW_LEFT
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167 || event.keyCode is SWT.ARROW_RIGHT;
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168 }
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169
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170 /**
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171 * This method is called by the framework to initialize this navigation
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172 * strategy object. Subclasses may extend.
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173 */
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174 protected void init() {
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175 }
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176 package void init_package() {
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177 init();
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178 }
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179 }