- * Initialization requires the SWT {@link Control} which the drag source is
- * attached, an {@link ISelectionProvider} for the control and a database
- * session.
- *
- * @author Tuukka Lehtonen
- */
-public class BasicDragSource implements DragSourceListener, SessionContainer {
-
- private Transfer[] transferAgents;
-
- private ISelectionProvider selectionProvider;
-
- private IStructuredSelection sel;
-
- private ResourceArray[] resources;
-
- private Session session;
-
- private String purpose;
-
- /**
- * @param selectionProvider
- * @param sourceControl
- * @param session the database Session to be used for serialization by this
- * drag source or null to put this drag source in
- * disabled state at construction time. To later enable this drag
- * source, use {@link #setSession(Session)} to set the resource
- * serializer.
- */
- public BasicDragSource(ISelectionProvider selectionProvider, Control sourceControl, Session session) {
- this(selectionProvider, sourceControl, session, null);
- }
-
- /**
- * @param selectionProvider
- * @param sourceControl
- * @param session the database Session to be used for serialization by this
- * drag source or null to put this drag source in
- * disabled state at construction time. To later enable this drag
- * source, use {@link #setSession(Session)} to set the resource
- * serializer.
- * @param purpose a string for defining a designation of the purpose of this
- * drag source. null indicates no special purpose.
- */
- public BasicDragSource(ISelectionProvider selectionProvider, Control sourceControl, Session session, String purpose) {
- this.selectionProvider = selectionProvider;
- this.transferAgents = new Transfer[] {
- TextTransfer.getInstance(),
- ResourceReferenceTransfer.createInstance(purpose),
- LocalObjectTransfer.getTransfer()
- };
- this.session = session;
- this.purpose = purpose;
- DragSource source = new DragSource(sourceControl, DND.DROP_LINK | DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT);
- source.setTransfer(transferAgents);
- source.addDragListener(this);
-
- // NOTE: This will disable SWT DND selection screenshot painting.
- source.setDragSourceEffect(new NoImageDragSourceEffect(sourceControl));
- }
-
- @Override
- public Session getSession() {
- return session;
- }
-
- @Override
- public void setSession(Session session) {
- this.session = session;
- }
-
- public void dragStart(DragSourceEvent event) {
- // Don't start dragging by default.
- event.doit = false;
-
- // Drag won't work without a database session.
- if (session == null)
- return;
-
- // Allow drag to start only if the selection is non-empty.
- sel = (IStructuredSelection) selectionProvider.getSelection();
- if (sel == null || sel.isEmpty())
- return;
-
- resources = ResourceAdaptionUtils.toResourceArrays(sel);
-
- event.doit = resources.length > 0;
- }
-
- public void dragSetData(DragSourceEvent event) {
- if (ResourceReferenceTransfer.getInstance().isSupportedType(event.dataType)) {
- event.data = resources;
- } else if (LocalObjectTransfer.getTransfer().isSupportedType(event.dataType)) {
- event.data = sel;
- } else if (TextTransfer.getInstance().isSupportedType(event.dataType)) {
- try {
- event.data = ResourceTransferUtils.createStringTransferable(session, resources, purpose);
- } catch (DatabaseException e) {
- event.doit = false;
- e.printStackTrace();
- }
- }
- }
-
- public void dragFinished(DragSourceEvent event) {
- // release resources
- sel = null;
- resources = null;
- }
-
-}
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ * VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.ui.dnd;
+
+import org.eclipse.jface.viewers.ISelectionProvider;
+import org.eclipse.jface.viewers.IStructuredSelection;
+import org.eclipse.swt.dnd.DND;
+import org.eclipse.swt.dnd.DragSource;
+import org.eclipse.swt.dnd.DragSourceEvent;
+import org.eclipse.swt.dnd.DragSourceListener;
+import org.eclipse.swt.dnd.TextTransfer;
+import org.eclipse.swt.dnd.Transfer;
+import org.eclipse.swt.widgets.Control;
+import org.simantics.db.Session;
+import org.simantics.db.common.ResourceArray;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.ui.utils.ResourceAdaptionUtils;
+
+/**
+ * A basic combined implementation of an SWT {@link DragSource} and
+ * {@link DragSourceListener} that supports the following transfers:
+ *
+ * Initialization requires the SWT {@link Control} which the drag source is
+ * attached, an {@link ISelectionProvider} for the control and a database
+ * session.
+ *
+ * @author Tuukka Lehtonen
+ */
+public class BasicDragSource implements DragSourceListener, SessionContainer {
+
+ private Transfer[] transferAgents;
+
+ private ISelectionProvider selectionProvider;
+
+ private IStructuredSelection sel;
+
+ private ResourceArray[] resources;
+
+ private Session session;
+
+ private String purpose;
+
+ /**
+ * @param selectionProvider
+ * @param sourceControl
+ * @param session the database Session to be used for serialization by this
+ * drag source or null to put this drag source in
+ * disabled state at construction time. To later enable this drag
+ * source, use {@link #setSession(Session)} to set the resource
+ * serializer.
+ */
+ public BasicDragSource(ISelectionProvider selectionProvider, Control sourceControl, Session session) {
+ this(selectionProvider, sourceControl, session, null);
+ }
+
+ /**
+ * @param selectionProvider
+ * @param sourceControl
+ * @param session the database Session to be used for serialization by this
+ * drag source or null to put this drag source in
+ * disabled state at construction time. To later enable this drag
+ * source, use {@link #setSession(Session)} to set the resource
+ * serializer.
+ * @param purpose a string for defining a designation of the purpose of this
+ * drag source. null indicates no special purpose.
+ */
+ public BasicDragSource(ISelectionProvider selectionProvider, Control sourceControl, Session session, String purpose) {
+ this.selectionProvider = selectionProvider;
+ this.transferAgents = new Transfer[] {
+ TextTransfer.getInstance(),
+ ResourceReferenceTransfer.createInstance(purpose),
+ LocalObjectTransfer.getTransfer()
+ };
+ this.session = session;
+ this.purpose = purpose;
+ DragSource source = new DragSource(sourceControl, DND.DROP_LINK | DND.DROP_MOVE | DND.DROP_COPY | DND.DROP_DEFAULT);
+ source.setTransfer(transferAgents);
+ source.addDragListener(this);
+
+ // NOTE: This will disable SWT DND selection screenshot painting.
+ source.setDragSourceEffect(new NoImageDragSourceEffect(sourceControl));
+ }
+
+ @Override
+ public Session getSession() {
+ return session;
+ }
+
+ @Override
+ public void setSession(Session session) {
+ this.session = session;
+ }
+
+ public void dragStart(DragSourceEvent event) {
+ // Don't start dragging by default.
+ event.doit = false;
+
+ // Drag won't work without a database session.
+ if (session == null)
+ return;
+
+ // Allow drag to start only if the selection is non-empty.
+ sel = (IStructuredSelection) selectionProvider.getSelection();
+ if (sel == null || sel.isEmpty())
+ return;
+
+ resources = ResourceAdaptionUtils.toResourceArrays(sel);
+
+ event.doit = resources.length > 0;
+ }
+
+ public void dragSetData(DragSourceEvent event) {
+ if (ResourceReferenceTransfer.getInstance().isSupportedType(event.dataType)) {
+ event.data = resources;
+ } else if (LocalObjectTransfer.getTransfer().isSupportedType(event.dataType)) {
+ event.data = sel;
+ } else if (TextTransfer.getInstance().isSupportedType(event.dataType)) {
+ try {
+ event.data = ResourceTransferUtils.createStringTransferable(session, resources, purpose);
+ } catch (DatabaseException e) {
+ event.doit = false;
+ e.printStackTrace();
+ }
+ }
+ }
+
+ public void dragFinished(DragSourceEvent event) {
+ // release resources
+ sel = null;
+ resources = null;
+ }
+
+}