Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.ui / src / org / simantics / ui / dnd / LocalSelectionDragSourceListener.java

diff --git a/bundles/org.simantics.ui/src/org/simantics/ui/dnd/LocalSelectionDragSourceListener.java b/bundles/org.simantics.ui/src/org/simantics/ui/dnd/LocalSelectionDragSourceListener.java
new file mode 100644 (file)
index 0000000..20272e9
--- /dev/null
+++ b/bundles/org.simantics.ui/src/org/simantics/ui/dnd/LocalSelectionDragSourceListener.java
@@ -0,0 +1,70 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.ui.dnd;\r
+\r
+import org.eclipse.jface.viewers.ISelection;\r
+import org.eclipse.jface.viewers.ISelectionProvider;\r
+import org.eclipse.swt.dnd.DragSourceEvent;\r
+import org.eclipse.swt.dnd.DragSourceListener;\r
+import org.eclipse.swt.dnd.DropTargetListener;\r
+\r
+/**\r
+ * An SWT drag source listener that provides the specified selection provider's\r
+ * {@link ISelection} as the dragged data to {@link DropTargetListener}s.\r
+ * \r
+ * <p>\r
+ * Only guaranteed to work with {@link LocalObjectTransfer} which will only work\r
+ * within a single application.\r
+ * \r
+ * @author Tuukka Lehtonen\r
+ */\r
+public class LocalSelectionDragSourceListener implements DragSourceListener {\r
+\r
+    ISelectionProvider selectionProvider;\r
+    ISelection         selection;\r
+\r
+    public LocalSelectionDragSourceListener(ISelectionProvider selectionProvider) {\r
+        this.selectionProvider = selectionProvider;\r
+    }\r
+\r
+    public ISelection getSelection() {\r
+        return selection;\r
+    }\r
+\r
+    @Override\r
+    public void dragFinished(DragSourceEvent event) {\r
+        //System.out.println("SOURCE FINISH " + event);\r
+        LocalObjectTransfer.getTransfer().clear();\r
+        selection = null;\r
+    }\r
+\r
+    @Override\r
+    public void dragSetData(DragSourceEvent event) {\r
+        //System.out.println("SOURCE PUT " + event + " " + selection);\r
+        event.data = selection;\r
+        LocalObjectTransfer.getTransfer().setObject(selection);\r
+        \r
+    }\r
+\r
+    @Override\r
+    public void dragStart(DragSourceEvent event) {\r
+        //System.out.println("SOURCE START " + event + " " + selectionProvider.getSelection());\r
+        selection = selectionProvider.getSelection();\r
+        if (selection == null || selection.isEmpty())\r
+            event.doit = false;\r
+        else {\r
+            event.doit = true;\r
+            LocalObjectTransfer.getTransfer().setObject(selection);\r
+        }\r
+    }\r
+\r
+}\r