--- /dev/null
+/*******************************************************************************\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.g2d.dnd;\r
+\r
+import java.awt.Component;\r
+import java.awt.Cursor;\r
+import java.awt.Point;\r
+import java.awt.datatransfer.Transferable;\r
+import java.awt.dnd.DnDConstants;\r
+import java.awt.dnd.DragGestureEvent;\r
+import java.awt.dnd.DragGestureListener;\r
+import java.awt.dnd.DragGestureRecognizer;\r
+import java.awt.dnd.DragSource;\r
+import java.awt.dnd.DragSourceDragEvent;\r
+import java.awt.dnd.DragSourceDropEvent;\r
+import java.awt.dnd.DragSourceEvent;\r
+import java.awt.dnd.DragSourceListener;\r
+import java.awt.dnd.InvalidDnDOperationException;\r
+import java.awt.event.InputEvent;\r
+import java.awt.event.MouseEvent;\r
+import java.util.Collection;\r
+import java.util.TooManyListenersException;\r
+\r
+import org.simantics.g2d.canvas.Hints;\r
+import org.simantics.g2d.canvas.ICanvasContext;\r
+import org.simantics.g2d.canvas.impl.AbstractCanvasParticipant;\r
+import org.simantics.g2d.canvas.impl.DependencyReflection.Dependency;\r
+import org.simantics.g2d.participant.MouseUtil;\r
+import org.simantics.g2d.participant.MouseUtil.ButtonInfo;\r
+import org.simantics.g2d.participant.MouseUtil.MouseInfo;\r
+import org.simantics.scenegraph.g2d.events.EventHandlerReflection.EventHandler;\r
+import org.simantics.scenegraph.g2d.events.MouseEvent.MouseButtonReleasedEvent;\r
+import org.simantics.scenegraph.g2d.events.MouseEvent.MouseDragBegin;\r
+import org.simantics.utils.ui.ErrorLogger;\r
+\r
+/**\r
+ * This participant handles drop operations.\r
+ * \r
+ * To implement a drop operation add an implementation of IDragParticipant to the canvas.\r
+ * \r
+ * Drag interactor is added by chassis.\r
+ * \r
+ * @author Toni Kalajainen\r
+ */\r
+public class DragInteractor extends AbstractCanvasParticipant implements DragSourceListener {\r
+\r
+ private final Component component;\r
+ private IDragSourceParticipant dragParticipant;\r
+ @Dependency\r
+ MouseUtil mouseUtil;\r
+\r
+ public DragInteractor(Component component) {\r
+ super();\r
+ this.component = component;\r
+ }\r
+\r
+ @Override\r
+ public void addedToContext(ICanvasContext ctx) {\r
+ super.addedToContext(ctx);\r
+ installDragSource();\r
+ }\r
+\r
+ @Override\r
+ public void removedFromContext(ICanvasContext ctx) {\r
+ DRAG_SOURCE.removeDragSourceListener(this);\r
+ super.removedFromContext(ctx);\r
+ }\r
+\r
+ int getAllowedOps() {\r
+ int result = 0;\r
+ for (IDragSourceParticipant p : getDragParticipants())\r
+ result |= p.getAllowedOps();\r
+ return result;\r
+ }\r
+\r
+ class MyDragGestureRecognizer extends DragGestureRecognizer {\r
+\r
+ private static final long serialVersionUID = 920532285869166322L;\r
+\r
+ protected MyDragGestureRecognizer(DragSource ds, Component c, int actionMask) {\r
+ super(ds, c, actionMask);\r
+ }\r
+\r
+ @Override\r
+ protected void registerListeners() {\r
+ }\r
+\r
+ @Override\r
+ protected void unregisterListeners() {\r
+ }\r
+ public boolean handleDrag(MouseDragBegin me) {\r
+ for (IDragSourceParticipant p : getDragParticipants()) {\r
+ int op = p.canDrag(me);\r
+ if (op==0) continue;\r
+ int x = (int)me.controlPosition.getX();\r
+ int y = (int)me.controlPosition.getY();\r
+ InputEvent awtie = new MouseEvent(component, 0, me.time, 0, x, y, 1, false);\r
+ appendEvent(awtie);\r
+ fireDragGestureRecognized(op, new Point(x, y));\r
+ return true;\r
+ }\r
+ return false;\r
+ }\r
+ }\r
+\r
+ static DragSource DRAG_SOURCE = new DragSource();\r
+ MyDragGestureRecognizer dgr;\r
+\r
+ @EventHandler(priority = -1000)\r
+ public boolean handleDrag(MouseDragBegin me) {\r
+ return dgr.handleDrag(me);\r
+ }\r
+\r
+ void installDragSource() {\r
+ Integer actionMask = getHint(Hints.KEY_ALLOWED_DRAG_ACTIONS);\r
+ if (actionMask == null)\r
+ actionMask = DnDConstants.ACTION_COPY_OR_MOVE | DnDConstants.ACTION_REFERENCE;\r
+\r
+ dgr = new MyDragGestureRecognizer(DRAG_SOURCE, component, actionMask);\r
+ try {\r
+ dgr.addDragGestureListener(new DragGestureListener() {\r
+ @Override\r
+ public void dragGestureRecognized(DragGestureEvent e) {\r
+ // Start drag\r
+ try {\r
+ // Create transferable from selection\r
+ Transferable transferable = null;\r
+ IDragSourceParticipant activeParticipant = null;\r
+ for (IDragSourceParticipant p : getDragParticipants())\r
+ {\r
+ transferable = p.dragStart(e);\r
+ if (transferable!=null) {\r
+ activeParticipant = p;\r
+ break;\r
+ }\r
+ }\r
+\r
+ if (transferable==null)\r
+ return;\r
+\r
+ //initial cursor, transferable, dsource listener\r
+\r
+// int allowedOps = activeParticipant.getAllowedOps();\r
+// int action = e.getDragAction();\r
+// Cursor cursor = getCursor(action, allowedOps);\r
+// DRAG_SOURCE.startDrag(e, cursor, transferable, DragInteractor.this);\r
+\r
+ DRAG_SOURCE.startDrag(e, null, transferable, DragInteractor.this);\r
+ DragInteractor.this.dragParticipant = activeParticipant;\r
+\r
+ // synthetisize mouse button release\r
+ MouseInfo mi = mouseUtil.getMouseInfo(0);\r
+ if (mi!=null) {\r
+ long time = System.currentTimeMillis();\r
+ for (ButtonInfo bi : mi.getButtonInfos())\r
+ {\r
+ if (!bi.down) continue;\r
+ // FIXME : screenPos null (requires changes in MouseInfo)\r
+ MouseButtonReleasedEvent mbre = new MouseButtonReleasedEvent(null, time, mi.mouseId, mi.buttons, bi.stateMask, bi.button, time-bi.eventTime, mi.controlPosition, null);\r
+ getContext().getEventQueue().queueEvent(mbre);\r
+ }\r
+ }\r
+\r
+ } catch( InvalidDnDOperationException idoe ) {\r
+ ErrorLogger.defaultLogError(idoe);\r
+ }\r
+ }});\r
+ } catch (TooManyListenersException e) {\r
+ // Should not happen\r
+ e.printStackTrace();\r
+ }\r
+ DRAG_SOURCE.addDragSourceListener(this);\r
+ }\r
+\r
+ protected Collection<IDragSourceParticipant> getDragParticipants() {\r
+ return getContext().getItemsByClass(IDragSourceParticipant.class);\r
+ }\r
+\r
+ @Override\r
+ public void dragEnter(final DragSourceDragEvent dsde) {\r
+ if (dragParticipant==null) return;\r
+ syncExec(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ if (dragParticipant==null) return;\r
+\r
+// int allowedOps = dragParticipant.getAllowedOps();\r
+// int action = dsde.getDropAction();\r
+// Cursor cursor = getCursor(action, allowedOps);\r
+// dsde.getDragSourceContext().setCursor( cursor );\r
+\r
+ dragParticipant.dragEnter(dsde);\r
+ }});\r
+ }\r
+\r
+ @Override\r
+ public void dragDropEnd(final DragSourceDropEvent dsde) {\r
+ if (dragParticipant==null) return;\r
+ syncExec(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ if (dragParticipant==null) return;\r
+ dragParticipant.dragDropEnd(dsde);\r
+ endDrag();\r
+ }\r
+ });\r
+ }\r
+\r
+ @Override\r
+ public void dragExit(final DragSourceEvent dse) {\r
+ if (dragParticipant==null) return;\r
+ syncExec(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ if (dragParticipant==null) return;\r
+ dragParticipant.dragExit(dse);\r
+ endDrag();\r
+ }\r
+ });\r
+ }\r
+\r
+ @Override\r
+ public void dragOver(final DragSourceDragEvent dsde) {\r
+ syncExec(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ if (dragParticipant==null) return;\r
+ dragParticipant.dragOver(dsde);\r
+ }\r
+ });\r
+ }\r
+\r
+ public static Cursor getCursor(int action, int allowedOps)\r
+ {\r
+ boolean allowed = (action & allowedOps) != 0;\r
+ if (action == DnDConstants.ACTION_LINK)\r
+ return allowed ? DragSource.DefaultLinkDrop : DragSource.DefaultLinkNoDrop;\r
+ else if (action == DnDConstants.ACTION_COPY)\r
+ return allowed ? DragSource.DefaultCopyDrop : DragSource.DefaultCopyNoDrop;\r
+ else if (action == DnDConstants.ACTION_MOVE)\r
+ return allowed ? DragSource.DefaultMoveDrop : DragSource.DefaultMoveNoDrop;\r
+ return DragSource.DefaultCopyNoDrop;\r
+ }\r
+\r
+ @Override\r
+ public void dropActionChanged(final DragSourceDragEvent dsde) {\r
+\r
+ if (dragParticipant==null) return;\r
+ syncExec(new Runnable() {\r
+ @Override\r
+ public void run() {\r
+ if (dragParticipant==null) return;\r
+\r
+// int allowedOps = dragParticipant.getAllowedOps();\r
+// int action = dsde.getDropAction();\r
+// Cursor cursor = getCursor(action, allowedOps);\r
+// dsde.getDragSourceContext().setCursor( cursor );\r
+\r
+ dragParticipant.dropActionChanged(dsde);\r
+ }\r
+ });\r
+ }\r
+\r
+ public void endDrag()\r
+ {\r
+ Collection<DragPainter> dragPainters = getContext().getItemsByClass(DragPainter.class);\r
+ if (dragPainters.size()==0) return;\r
+ for (DragPainter dp : dragPainters)\r
+ dp.remove();\r
+ dragParticipant = null;\r
+ getContext().getContentContext().setDirty();\r
+ }\r
+\r
+}\r
Code Review / simantics / platform.git / blobdiff