Bug 215388 - Add API to make the DropTarget more open

5 files changed, 127 insertions, 0 deletions

diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/common/org/eclipse/swt/dnd/DND.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/common/org/eclipse/swt/dnd/DND.java
index 3f1679e3fb..5fcdc684ec 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/common/org/eclipse/swt/dnd/DND.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/common/org/eclipse/swt/dnd/DND.java
@@ -198,6 +198,8 @@ public class DND {
 	 * for a control using <code>getData(String)</code>. When a drop target 
 	 * is created for a control, it is stored as a property in the control 
 	 * using <code>setData(String, Object)</code>.
+	 * 
+	 * @since 3.4
 	 */
 	public static final String DROP_TARGET_KEY = "DropTarget"; //$NON-NLS-1$
 	
@@ -206,6 +208,8 @@ public class DND {
 	 * for a control using <code>getData(String)</code>. When a drag source 
 	 * is created for a control, it is stored as a property in the control 
 	 * using <code>setData(String, Object)</code>.
+	 * 
+	 * @since 3.4
 	 */
 	public static final String DRAG_SOURCE_KEY = "DragSource"; //$NON-NLS-1$
 
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/DragSource.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/DragSource.java
index dfbd6e03c2..04c1f8a404 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/DragSource.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/DragSource.java
@@ -219,6 +219,7 @@ static int checkStyle(int style) {
  * </ul>
  *
  * @see DragSourceListener
+ * @see #getDragListeners
  * @see #removeDragListener
  * @see DragSourceEvent
  */
@@ -468,6 +469,42 @@ private int GetData(int /*long*/ pFormatetc, int /*long*/ pmedium) {
 }
 
 /**
+ * Returns an array of listeners who will be notified when a drag and drop 
+ * operation is in progress, by sending it one of the messages defined in 
+ * the <code>DragSourceListener</code> interface.
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see DragSourceListener
+ * @see #addDragListener
+ * @see #removeDragListener
+ * @see DragSourceEvent
+ * 
+ * @since 3.4
+ */
+public DragSourceListener[] getDragListeners() {
+	Listener[] listeners = getListeners(DND.DragStart);
+	int length = listeners.length;
+	DragSourceListener[] dragListeners = new DragSourceListener[length];
+	int count = 0;
+	for (int i = 0; i < length; i++) {
+		Listener listener = listeners[i];
+		if (listener instanceof DNDListener) {
+			SWTEventListener eventListener = ((DNDListener) listener).getEventListener();
+			dragListeners[count] = (DragSourceListener) eventListener;
+			count++;
+		}
+	}
+	if (count == length) return dragListeners;
+	DragSourceListener[] result = new DragSourceListener[count];
+	System.arraycopy(dragListeners, 0, result, 0, count);
+	return result;
+}
+
+/**
  * Returns the drag effect that is registered for this DragSource.  This drag
  * effect will be used during a drag and drop operation.
  *
@@ -630,6 +667,7 @@ private int Release() {
  *
  * @see DragSourceListener
  * @see #addDragListener
+ * @see #getDragListeners
  */
 public void removeDragListener(DragSourceListener listener) {
 	if (listener == null) DND.error(SWT.ERROR_NULL_ARGUMENT);
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/DropTarget.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/DropTarget.java
index 691f292df7..d4a99c20de 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/DropTarget.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/DropTarget.java
@@ -197,6 +197,7 @@ static int checkStyle (int style) {
  * </ul>
  *
  * @see DropTargetListener
+ * @see #getDropListeners
  * @see #removeDropListener
  * @see DropTargetEvent
  */
@@ -472,6 +473,42 @@ public Control getControl () {
 }
 
 /**
+ * Returns an array of listeners who will be notified when a drag and drop 
+ * operation is in progress, by sending it one of the messages defined in 
+ * the <code>DropTargetListener</code> interface.
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see DropTargetListener
+ * @see #addDropListener
+ * @see #removeDropListener
+ * @see DropTargetEvent
+ * 
+ * @since 3.4
+ */
+public DropTargetListener[] getDropListeners() {
+	Listener[] listeners = getListeners(DND.DragEnter);
+	int length = listeners.length;
+	DropTargetListener[] dropListeners = new DropTargetListener[length];
+	int count = 0;
+	for (int i = 0; i < length; i++) {
+		Listener listener = listeners[i];
+		if (listener instanceof DNDListener) {
+			SWTEventListener eventListener = ((DNDListener) listener).getEventListener();
+			dropListeners[count] = (DropTargetListener) eventListener;
+			count++;
+		}
+	}
+	if (count == length) return dropListeners;
+	DropTargetListener[] result = new DropTargetListener[count];
+	System.arraycopy(dropListeners, 0, result, 0, count);
+	return result;
+}
+
+/**
  * Returns the drop effect for this DropTarget.  This drop effect will be 
  * used during a drag and drop to display the drag under effect on the 
  * target widget.
@@ -612,6 +649,7 @@ void refresh() {
  *
  * @see DropTargetListener
  * @see #addDropListener
+ * @see #getDropListeners
  */
 public void removeDropListener(DropTargetListener listener) {	
 	if (listener == null) DND.error (SWT.ERROR_NULL_ARGUMENT);
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/widgets/EventTable.java b/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/widgets/EventTable.java
index 0184bec91e..86c15daa90 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/widgets/EventTable.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT/common/org/eclipse/swt/widgets/EventTable.java
@@ -26,6 +26,24 @@ class EventTable {
 	Listener [] listeners;
 	int level;
 	
+public Listener[] getListeners(int eventType) {
+	if (types == null) return new Listener[0];
+	int size = 0;
+	for (int i=0; i<types.length; i++) {
+		if (types [i] == eventType) size++;
+	}
+	Listener[] result = new Listener[size];
+	if (size == 0) return result;
+	int count = 0;
+	for (int i=0; i<types.length; i++) {
+		if (types [i] == eventType) {
+			result[count] = listeners[i];
+			count++;
+		}
+	}	
+	return result;
+}
+
 public void hook (int eventType, Listener listener) {
 	if (types == null) types = new int [4];
 	if (listeners == null) listeners = new Listener [4];
diff --git a/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Widget.java b/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Widget.java
index a966baf9b5..45427180d0 100755
--- a/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Widget.java
+++ b/bundles/org.eclipse.swt/Eclipse SWT/win32/org/eclipse/swt/widgets/Widget.java
@@ -172,6 +172,7 @@ void _addListener (int eventType, Listener listener) {
  *
  * @see Listener
  * @see SWT
+ * @see #getListeners(int)
  * @see #removeListener(int, Listener)
  * @see #notifyListeners
  */
@@ -557,6 +558,32 @@ public Display getDisplay () {
 	return display;
 }
 
+/**
+ * Returns an array of listeners who will be notified when an event 
+ * of the given type occurs. The event type is one of the event constants 
+ * defined in class <code>SWT</code>.
+ *
+ * @param eventType the type of event to listen for
+ * @return an array of listeners that will be notified when the event occurs
+ *
+ * @exception SWTException <ul>
+ *    <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
+ *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
+ * </ul>
+ *
+ * @see Listener
+ * @see SWT
+ * @see #addListener(int, Listener)
+ * @see #removeListener(int, Listener)
+ * @see #notifyListeners
+ * 
+ * @since 3.4
+ */
+public Listener[] getListeners (int eventType) {
+	checkWidget();
+	return eventTable.getListeners(eventType);
+}
+
 Menu getMenu () {
 	return null;
 }
@@ -712,6 +739,7 @@ GC new_GC (GCData data) {
  * 
  * @see SWT
  * @see #addListener
+ * @see #getListeners(int)
  * @see #removeListener(int, Listener)
  */
 public void notifyListeners (int eventType, Event event) {
@@ -860,6 +888,7 @@ void releaseWidget () {
  * @see Listener
  * @see SWT
  * @see #addListener
+ * @see #getListeners(int)
  * @see #notifyListeners
  */
 public void removeListener (int eventType, Listener listener) {