Examples of org.eclipse.jface.viewers.ViewerDropAdapter

org.eclipse.jface.viewers.ViewerDropAdapter
This adapter class provides generic drag-and-drop support for a viewer.
Subclasses must implement the following methods:
- validateDrop - identifies valid drop targets in viewer
- performDrop - carries out a drop into a viewer
The setFeedbackEnabled method can be called to turn on and off visual insertion feedback (on by default).

                }
            }
        });


        // drag drop order support
        table.addDropSupport(DND.DROP_MOVE | DND.DROP_DEFAULT, types, new ViewerDropAdapter(table) {


            @Override
            public boolean validateDrop(Object target, int operation, TransferData transferType) {
                if (target instanceof Definition) {
                    return true;

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              IStatus.ERROR, UIPlugin.PLUGIN_ID, 
              Messages.Generic_errorExecutingCommand, e)), false);
        }
      }
    });
    ViewerDropAdapter dropAdapter = new ViewerDropAdapter(viewer) {


      /* (non-Javadoc)
       * @see org.eclipse.jface.viewers.ViewerDropAdapter#performDrop(java.lang.Object)
       */
      @Override
      public boolean performDrop(final Object target) {
        Display.getDefault().asyncExec(new Runnable() {


          /* (non-Javadoc)
           * @see java.lang.Runnable#run()
           */
          @Override
          public void run() {
            IHandlerService handlerService = 
              (IHandlerService) getSite().getService(IHandlerService.class);
            ICommandService commandService = 
              (ICommandService) getSite().getService(ICommandService.class);
            Command cmd = commandService.getCommand("net.sf.logsaw.ui.commands.AddLogResourceCommand"); //$NON-NLS-1$
            try {
              Parameterization param = new Parameterization(
                  cmd.getParameter("net.sf.logsaw.ui.commands.AddLogResourceCommand.filename"), ((String[]) target)[0]); //$NON-NLS-1$
              ParameterizedCommand paraCmd = new ParameterizedCommand(cmd, new Parameterization[] {param});
              handlerService.executeCommand(paraCmd, null);
            } catch (CommandException e) {
              // log and show error
              UIPlugin.logAndShowError(new CoreException(new Status(
                  IStatus.ERROR, UIPlugin.PLUGIN_ID, 
                  Messages.Generic_errorExecutingCommand, e)), false);
            }
          }
        });
        // Always return true
        return true;
      }


      /* (non-Javadoc)
       * @see org.eclipse.jface.viewers.ViewerDropAdapter#validateDrop(java.lang.Object, int, org.eclipse.swt.dnd.TransferData)
       */
      @Override
      public boolean validateDrop(Object target, int op,
          TransferData type) {
        return FileTransfer.getInstance().isSupportedType(type) && 
            (getCurrentTarget() == null);
      }
    };
    dropAdapter.setFeedbackEnabled(false);
    viewer.addDropSupport(DND.DROP_COPY | DND.DROP_MOVE, 
        new Transfer[] {FileTransfer.getInstance()}, dropAdapter);
    getSite().setSelectionProvider(viewer);
    
    // Setup popup menu

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                    event.doit = false;
                }
            }
        });


        viewer.addDropSupport(DND.DROP_COPY | DND.DROP_MOVE, transfers, new ViewerDropAdapter(viewer) {


            private TreeParent targetNode;


            @Override
            public boolean performDrop(Object data) {

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        });
      }
    });


    /* Drop Support */
    ViewerDropAdapter dropSupport = new ViewerDropAdapter(fItemViewer) {


      @Override
      public boolean validateDrop(Object target, int operation, TransferData transferType) {
        return true;
      }


      @Override
      public boolean performDrop(Object data) {
        ToolBarItem target = (ToolBarItem) getCurrentTarget();
        if (target != null) {
          onMove((StructuredSelection) data, target, getCurrentLocation());
          return true;
        }


        return false;
      }
    };
    dropSupport.setFeedbackEnabled(true);
    dropSupport.setScrollEnabled(true);
    dropSupport.setSelectionFeedbackEnabled(true);
    fItemViewer.addDropSupport(DND.DROP_MOVE, new Transfer[] { LocalSelectionTransfer.getTransfer() }, dropSupport);


    /* Set Dummy Input */
    fItemViewer.setInput(this);

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        });
      }
    });


    /* Drop Support */
    ViewerDropAdapter dropSupport = new ViewerDropAdapter(fViewer) {


      @Override
      public boolean validateDrop(Object target, int operation, TransferData transferType) {
        return true;
      }


      @Override
      public boolean performDrop(Object data) {
        ShareProvider target = (ShareProvider) getCurrentTarget();
        if (target != null) {
          onMove((StructuredSelection) data, target, getCurrentLocation());
          return true;
        }


        return false;
      }
    };
    dropSupport.setFeedbackEnabled(true);
    dropSupport.setScrollEnabled(true);
    dropSupport.setSelectionFeedbackEnabled(true);
    fViewer.addDropSupport(DND.DROP_MOVE, new Transfer[] { LocalSelectionTransfer.getTransfer() }, dropSupport);


    /* Set input (ignored by ContentProvider anyways) */
    fViewer.setInput(this);
    updateCheckedState();

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  private void initDragAndDrop() {
    int ops = DND.DROP_COPY | DND.DROP_MOVE;
    Transfer[] transfers = new Transfer[] { LocalSelectionTransfer.getTransfer() };


    ViewerDropAdapter dropAdapter = new ViewerDropAdapter(fViewer) {
      @Override
      public boolean validateDrop(final Object target, int operation, TransferData transferType) {
        if (LocalSelectionTransfer.getTransfer().isSupportedType(transferType)) {
          final boolean[] result = new boolean[] { false };
          SafeRunner.run(new LoggingSafeRunnable() {
            public void run() throws Exception {
              ISelection selection = LocalSelectionTransfer.getTransfer().getSelection();
              if (selection instanceof IStructuredSelection) {
                List<?> draggedObjects = ((IStructuredSelection) selection).toList();
                result[0] = isValidDrop(draggedObjects, target);
              }
            }
          });


          return result[0];
        }


        return false;
      }


      @Override
      public boolean performDrop(final Object data) {
        if (data instanceof IStructuredSelection) {
          SafeRunner.run(new LoggingSafeRunnable() {
            public void run() throws Exception {
              IStructuredSelection selection = (IStructuredSelection) data;
              List<?> draggedObjects = selection.toList();
              perfromDrop(draggedObjects, getCurrentTarget());
            }
          });


          return true;
        }


        return false;
      }
    };


    dropAdapter.setFeedbackEnabled(false);
    fViewer.addDropSupport(ops, transfers, dropAdapter);
  }

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