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annotate org.eclipse.jface/src/org/eclipse/jface/util/DelegatingDropAdapter.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) 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 org.eclipse.jface.util.DelegatingDropAdapter;
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15 import org.eclipse.jface.util.TransferDropTargetListener;
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16 import org.eclipse.jface.util.SafeRunnable;
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17
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18
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19 import org.eclipse.swt.dnd.DND;
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20 import org.eclipse.swt.dnd.DropTargetEvent;
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21 import org.eclipse.swt.dnd.DropTargetListener;
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22 import org.eclipse.swt.dnd.Transfer;
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23 import org.eclipse.swt.dnd.TransferData;
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24
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25 import java.lang.all;
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26 import java.util.List;
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27 import java.util.ArrayList;
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28 import java.util.Iterator;
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29 import java.util.Set;
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30
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31 /**
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32 * A <code>DelegatingDropAdapter</code> is a <code>DropTargetListener</code> that
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33 * maintains and delegates to a set of {@link TransferDropTargetListener}s. Each
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34 * <code>TransferDropTargetListener</code> can then be implemented as if it were
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35 * the DropTarget's only <code>DropTargetListener</code>.
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36 * <p>
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37 * On <code>dragEnter</code>, <code>dragOperationChanged</code>, <code>dragOver</code>
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38 * and <code>drop</code>, a <i>current</i> listener is obtained from the set of all
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39 * <code>TransferDropTargetListeners</code>. The current listener is the first listener
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40 * to return <code>true</code> for
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41 * {@link TransferDropTargetListener#isEnabled(DropTargetEvent)}.
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42 * The current listener is forwarded all <code>DropTargetEvents</code> until some other
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43 * listener becomes the current listener, or the drop terminates.
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44 * </p>
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45 * <p>
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46 * After adding all <code>TransferDropTargetListeners</code> to the
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47 * <code>DelegatingDropAdapter</code> the combined set of <code>Transfers</code> should
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48 * be set in the SWT <code>DropTarget</code>. <code>#getTransfers()</code> provides the
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49 * set of <code>Transfer</code> types of all <code>TransferDropTargetListeners</code>.
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50 * </p>
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51 * <p>
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52 * The following example snippet shows a <code>DelegatingDropAdapter</code> with two
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53 * <code>TransferDropTargetListeners</code>. One supports dropping resources and
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54 * demonstrates how a listener can be disabled in the isEnabled method.
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55 * The other listener supports text transfer.
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56 * </p>
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57 * <code><pre>
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58 * final TreeViewer viewer = new TreeViewer(shell, SWT.NONE);
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59 * DelegatingDropAdapter dropAdapter = new DelegatingDropAdapter();
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60 * dropAdapter.addDropTargetListener(new TransferDropTargetListener() {
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61 * public Transfer getTransfer() {
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62 * return ResourceTransfer.getInstance();
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63 * }
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64 * public bool isEnabled(DropTargetEvent event) {
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65 * // disable drop listener if there is no viewer selection
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66 * if (viewer.getSelection().isEmpty())
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67 * return false;
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68 * return true;
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69 * }
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70 * public void dragEnter(DropTargetEvent event) {}
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71 * public void dragLeave(DropTargetEvent event) {}
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72 * public void dragOperationChanged(DropTargetEvent event) {}
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73 * public void dragOver(DropTargetEvent event) {}
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74 * public void drop(DropTargetEvent event) {
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75 * if (event.data is null)
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76 * return;
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77 * IResource[] resources = (IResource[]) event.data;
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78 * if (event.detail is DND.DROP_COPY) {
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79 * // copy resources
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80 * } else {
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81 * // move resources
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82 * }
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83 *
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84 * }
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85 * public void dropAccept(DropTargetEvent event) {}
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86 * });
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87 * dropAdapter.addDropTargetListener(new TransferDropTargetListener() {
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88 * public Transfer getTransfer() {
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89 * return TextTransfer.getInstance();
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90 * }
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91 * public bool isEnabled(DropTargetEvent event) {
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92 * return true;
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93 * }
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94 * public void dragEnter(DropTargetEvent event) {}
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95 * public void dragLeave(DropTargetEvent event) {}
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96 * public void dragOperationChanged(DropTargetEvent event) {}
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97 * public void dragOver(DropTargetEvent event) {}
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98 * public void drop(DropTargetEvent event) {
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99 * if (event.data is null)
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100 * return;
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101 * System.out.println(event.data);
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102 * }
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103 * public void dropAccept(DropTargetEvent event) {}
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104 * });
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105 * viewer.addDropSupport(DND.DROP_COPY | DND.DROP_MOVE, dropAdapter.getTransfers(), dropAdapter);
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106 * </pre></code>
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107 * @since 3.0
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108 */
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109 public class DelegatingDropAdapter : DropTargetListener {
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110 private List listeners;
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111
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112 private TransferDropTargetListener currentListener;
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113
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114 private int originalDropType;
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115
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116 this(){
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117 listeners = new ArrayList();
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118 }
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119
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120 /**
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121 * Adds the given <code>TransferDropTargetListener</code>.
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122 *
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123 * @param listener the new listener
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124 */
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125 public void addDropTargetListener(TransferDropTargetListener listener) {
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126 listeners.add(cast(Object)listener);
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127 }
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128
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129 /**
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130 * The cursor has entered the drop target boundaries. The current listener is
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131 * updated, and <code>#dragEnter()</code> is forwarded to the current listener.
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132 *
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133 * @param event the drop target event
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134 * @see DropTargetListener#dragEnter(DropTargetEvent)
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135 */
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136 public void dragEnter(DropTargetEvent event) {
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137 // if (Policy.DEBUG_DRAG_DROP)
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138 // System.out.println("Drag Enter: " + toString()); //$NON-NLS-1$
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139 originalDropType = event.detail;
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140 updateCurrentListener(event);
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141 }
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142
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143 /**
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144 * The cursor has left the drop target boundaries. The event is forwarded to the
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145 * current listener.
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146 *
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147 * @param event the drop target event
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148 * @see DropTargetListener#dragLeave(DropTargetEvent)
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149 */
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150 public void dragLeave(DropTargetEvent event) {
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151 // if (Policy.DEBUG_DRAG_DROP)
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152 // System.out.println("Drag Leave: " + toString()); //$NON-NLS-1$
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153 setCurrentListener(null, event);
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154 }
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155
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156 /**
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157 * The operation being performed has changed (usually due to the user changing
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158 * a drag modifier key while dragging). Updates the current listener and forwards
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159 * this event to that listener.
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160 *
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161 * @param event the drop target event
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162 * @see DropTargetListener#dragOperationChanged(DropTargetEvent)
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163 */
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164 public void dragOperationChanged(DropTargetEvent event) {
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165 // if (Policy.DEBUG_DRAG_DROP)
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166 // System.out.println("Drag Operation Changed to: " + event.detail); //$NON-NLS-1$
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167 originalDropType = event.detail;
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168 TransferDropTargetListener oldListener = getCurrentListener();
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169 updateCurrentListener(event);
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170 TransferDropTargetListener newListener = getCurrentListener();
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171 // only notify the current listener if it hasn't changed based on the
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172 // operation change. otherwise the new listener would get a dragEnter
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173 // followed by a dragOperationChanged with the exact same event.
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174 if (newListener !is null && newListener is oldListener) {
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175 SafeRunnable.run(new class(event,newListener) SafeRunnable {
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176 DropTargetEvent event_;
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177 TransferDropTargetListener newListener_;
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178 this(DropTargetEvent a,TransferDropTargetListener b){
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179 event_=a;
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180 newListener_=b;
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181 }
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182 public void run() {
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183 newListener_.dragOperationChanged(event_);
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184 }
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185 });
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186 }
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187 }
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188
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189 /**
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190 * The cursor is moving over the drop target. Updates the current listener and
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191 * forwards this event to that listener. If no listener can handle the drag
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192 * operation the <code>event.detail</code> field is set to <code>DND.DROP_NONE</code>
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193 * to indicate an invalid drop.
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194 *
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195 * @param event the drop target event
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196 * @see DropTargetListener#dragOver(DropTargetEvent)
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197 */
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198 public void dragOver(DropTargetEvent event) {
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199 TransferDropTargetListener oldListener = getCurrentListener();
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200 updateCurrentListener(event);
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201 TransferDropTargetListener newListener = getCurrentListener();
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202
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203 // only notify the current listener if it hasn't changed based on the
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204 // drag over. otherwise the new listener would get a dragEnter
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205 // followed by a dragOver with the exact same event.
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206 if (newListener !is null && newListener is oldListener) {
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207 SafeRunnable.run(new class(event,newListener) SafeRunnable {
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208 DropTargetEvent event_;
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209 TransferDropTargetListener newListener_;
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210 this(DropTargetEvent a,TransferDropTargetListener b){
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211 event_=a;
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212 newListener_=b;
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213 }
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214 public void run() {
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215 newListener_.dragOver(event_);
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216 }
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217 });
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218 }
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219 }
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220
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221 /**
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222 * Forwards this event to the current listener, if there is one. Sets the
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223 * current listener to <code>null</code> afterwards.
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224 *
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225 * @param event the drop target event
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226 * @see DropTargetListener#drop(DropTargetEvent)
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227 */
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228 public void drop(DropTargetEvent event) {
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229 // if (Policy.DEBUG_DRAG_DROP)
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230 // System.out.println("Drop: " + toString()); //$NON-NLS-1$
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231 updateCurrentListener(event);
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232 if (getCurrentListener() !is null) {
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233 SafeRunnable.run(new class(event) SafeRunnable {
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234 DropTargetEvent event_;
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235 this(DropTargetEvent a){ event_=a;}
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236 public void run() {
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237 getCurrentListener().drop(event_);
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238 }
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239 });
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240 }
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241 setCurrentListener(null, event);
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242 }
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243
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244 /**
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245 * Forwards this event to the current listener if there is one.
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246 *
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247 * @param event the drop target event
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248 * @see DropTargetListener#dropAccept(DropTargetEvent)
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249 */
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250 public void dropAccept(DropTargetEvent event) {
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251 // if (Policy.DEBUG_DRAG_DROP)
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252 // System.out.println("Drop Accept: " + toString()); //$NON-NLS-1$
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253 if (getCurrentListener() !is null) {
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254 SafeRunnable.run(new class(event) SafeRunnable {
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255 DropTargetEvent event_;
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256 this(DropTargetEvent a){ event_=a;}
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257 public void run() {
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258 getCurrentListener().dropAccept(event_);
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259 }
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260 });
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261 }
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262 }
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263
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264 /**
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265 * Returns the listener which currently handles drop events.
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266 *
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267 * @return the <code>TransferDropTargetListener</code> which currently
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268 * handles drop events.
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269 */
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270 private TransferDropTargetListener getCurrentListener() {
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271 return currentListener;
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272 }
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273
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274 /**
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275 * Returns the transfer data type supported by the given listener.
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276 * Returns <code>null</code> if the listener does not support any of the
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277 * specified data types.
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278 *
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279 * @param dataTypes available data types
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280 * @param listener <code>TransferDropTargetListener</code> to use for testing
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281 * supported data types.
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282 * @return the transfer data type supported by the given listener or
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283 * <code>null</code>.
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284 */
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285 private TransferData getSupportedTransferType(TransferData[] dataTypes,
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286 TransferDropTargetListener listener) {
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287 for (int i = 0; i < dataTypes.length; i++) {
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288 if (listener.getTransfer().isSupportedType(dataTypes[i])) {
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289 return dataTypes[i];
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290 }
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291 }
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292 return null;
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293 }
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294
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295 /**
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296 * Returns the combined set of <code>Transfer</code> types of all
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297 * <code>TransferDropTargetListeners</code>.
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298 *
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299 * @return the combined set of <code>Transfer</code> types
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300 */
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301 public Transfer[] getTransfers() {
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302 Transfer[] types = new Transfer[listeners.size()];
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303 for (int i = 0; i < listeners.size(); i++) {
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304 TransferDropTargetListener listener = cast(TransferDropTargetListener) listeners
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305 .get(i);
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306 types[i] = listener.getTransfer();
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307 }
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308 return types;
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309 }
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310
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311 /**
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312 * Returns <code>true</code> if there are no listeners to delegate events to.
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313 *
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314 * @return <code>true</code> if there are no <code>TransferDropTargetListeners</code>
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315 * <code>false</code> otherwise
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316 */
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317 public bool isEmpty() {
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318 return listeners.isEmpty();
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319 }
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320
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321 /**
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322 * Removes the given <code>TransferDropTargetListener</code>.
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323 * Listeners should not be removed while a drag and drop operation is in progress.
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324 *
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325 * @param listener the listener to remove
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326 */
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327 public void removeDropTargetListener(TransferDropTargetListener listener) {
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328 if (currentListener is listener) {
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329 currentListener = null;
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330 }
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331 listeners.remove(cast(Object)listener);
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332 }
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333
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334 /**
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335 * Sets the current listener to <code>listener</code>. Sends the given
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336 * <code>DropTargetEvent</code> if the current listener changes.
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337 *
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338 * @return <code>true</code> if the new listener is different than the previous
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339 * <code>false</code> otherwise
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340 */
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341 private bool setCurrentListener(TransferDropTargetListener listener,
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342 DropTargetEvent event) {
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343 if (currentListener is listener) {
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344 return false;
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345 }
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346 if (currentListener !is null) {
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347 SafeRunnable.run(new class(event) SafeRunnable {
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348 DropTargetEvent event_;
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349 this(DropTargetEvent a){ event_=a;}
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350 public void run() {
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351 currentListener.dragLeave(event_);
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352 }
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353 });
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354 }
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355 currentListener = listener;
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356 // if (Policy.DEBUG_DRAG_DROP)
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357 // System.out.println("Current drop listener: " + listener); //$NON-NLS-1$
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358 if (currentListener !is null) {
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359 SafeRunnable.run(new class(event) SafeRunnable {
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360 DropTargetEvent event_;
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361 this(DropTargetEvent a){ event_=a;}
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362 public void run() {
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363 currentListener.dragEnter(event_);
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364 }
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365 });
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366 }
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367 return true;
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368 }
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369
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370 /**
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371 * Updates the current listener to one that can handle the drop. There can be many
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372 * listeners and each listener may be able to handle many <code>TransferData</code>
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373 * types. The first listener found that can handle a drop of one of the given
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374 * <code>TransferData</code> types will be selected.
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375 * If no listener can handle the drag operation the <code>event.detail</code> field
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376 * is set to <code>DND.DROP_NONE</code> to indicate an invalid drop.
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377 *
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378 * @param event the drop target event
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379 */
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380 private void updateCurrentListener(DropTargetEvent event) {
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381 int originalDetail = event.detail;
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382 // revert the detail to the "original" drop type that the User indicated.
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383 // this is necessary because the previous listener may have changed the detail
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384 // to something other than what the user indicated.
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385 event.detail = originalDropType;
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diff changeset
386
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387 Iterator iter = listeners.iterator();
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388 while (iter.hasNext()) {
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389 TransferDropTargetListener listener = cast(TransferDropTargetListener) iter
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390 .next();
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391 TransferData dataType = getSupportedTransferType(event.dataTypes,
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392 listener);
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393 if (dataType !is null) {
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394 TransferData originalDataType = event.currentDataType;
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395 // set the data type supported by the drop listener
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396 event.currentDataType = dataType;
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397 if (listener.isEnabled(event)) {
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parents:
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398 // if the listener stays the same, set its previously determined
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parents:
diff changeset
399 // event detail
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parents:
diff changeset
400 if (!setCurrentListener(listener, event)) {
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parents:
diff changeset
401 event.detail = originalDetail;
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402 }
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403 return;
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diff changeset
404 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
405 event.currentDataType = originalDataType;
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parents:
diff changeset
406 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
407 }
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diff changeset
408 setCurrentListener(null, event);
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parents:
diff changeset
409 event.detail = DND.DROP_NONE;
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parents:
diff changeset
410
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parents:
diff changeset
411 // -always- ensure that expand/scroll are on...otherwise
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parents:
diff changeset
412 // if a valid drop target is a child of an invalid one
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
413 // you can't get there...
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parents:
diff changeset
414 event.feedback = DND.FEEDBACK_EXPAND | DND.FEEDBACK_SCROLL;
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parents:
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415 }
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Frank Benoit <benoit@tionex.de>
parents:
diff changeset
416 }