Package org.eclipse.ui.navigator

Class CommonDropAdapter

java.lang.Object

org.eclipse.swt.dnd.DropTargetAdapter

org.eclipse.jface.viewers.ViewerDropAdapter

org.eclipse.ui.part.PluginDropAdapter

org.eclipse.ui.navigator.CommonDropAdapter

All Implemented Interfaces:

EventListener, DropTargetListener

public final class CommonDropAdapter
extends PluginDropAdapter

Provides an implementation of PluginDropAdapter which uses the extensions provided by the associated INavigatorContentService.

Clients should not need to create an instance of this class unless they are creating their own custom viewer. Otherwise, CommonViewer configures its drop adapter automatically.

Since:

3.2

See Also:

• INavigatorDnDService
• CommonDragAdapter
• CommonDragAdapterAssistant
• CommonDropAdapterAssistant
• CommonViewer

Field Summary

Fields inherited from class org.eclipse.ui.part.PluginDropAdapter

ATT_CLASS

Fields inherited from class org.eclipse.jface.viewers.ViewerDropAdapter

LOCATION_AFTER, LOCATION_BEFORE, LOCATION_NONE, LOCATION_ON

Constructor Summary

Constructors

Constructor	Description
CommonDropAdapter(INavigatorContentService aContentService, StructuredViewer aStructuredViewer)	Create a DropAdapter that handles a drop based on the given content service and selection provider.

Method Summary

Modifier and Type	Method	Description
void	dragEnter(DropTargetEvent event)	This implementation of dragEnter permits the default operation defined in event.detailto be performed on the current data type defined in event.currentDataType.
void	dragLeave(DropTargetEvent event)	This implementation of dragLeave does nothing.
Rectangle	getBounds(Item item)	Returns the bounds of the given SWT tree or table item.
int	getCurrentLocation()	Returns a constant describing the position of the mouse relative to the target (before, on, or after the target.
int	getCurrentOperation()	Returns the current operation.
Object	getCurrentTarget()	Returns the target object currently under the mouse.
TransferData	getCurrentTransfer()	Returns the current transfer.
Transfer[]	getSupportedDropTransfers()
void	overrideOperation(int operation)	Overrides the current operation for a drop that happens immediately after the current validateDrop.
boolean	performDrop(Object data)	Performs any work associated with the drop.
boolean	validateDrop(Object aDropTarget, int theDropOperation, TransferData theTransferData)	The PluginDropAdapter implementation of this ViewerDropAdapter method is used to notify the action that some aspect of the drop operation has changed.

Methods inherited from class org.eclipse.ui.part.PluginDropAdapter

drop, getPluginAdapter

Methods inherited from class org.eclipse.jface.viewers.ViewerDropAdapter

clearState, determineLocation, determineTarget, dragOperationChanged, dragOver, dropAccept, getCurrentEvent, getFeedbackEnabled, getSelectedObject, getThreshold, getViewer, handleException, setExpandEnabled, setFeedbackEnabled, setScrollEnabled, setScrollExpandEnabled, setSelectionFeedbackEnabled

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CommonDropAdapter

public CommonDropAdapter(INavigatorContentService aContentService,
 StructuredViewer aStructuredViewer)

Create a DropAdapter that handles a drop based on the given content service and selection provider.

Parameters:

aContentService - The content service this Drop Adapter is associated with

aStructuredViewer - The viewer this DropAdapter is associated with.

Method Details

getSupportedDropTransfers

public Transfer[] getSupportedDropTransfers()

Returns:

An array of Transfers allowed by the CommonDropAdapter. Includes LocalSelectionTransfer.getTransfer(), FileTransfer.getInstance(), PluginTransfer.getInstance().

See Also:

• LocalSelectionTransfer
• FileTransfer
• PluginTransfer

dragEnter

public void dragEnter(DropTargetEvent event)

Description copied from class: DropTargetAdapter

This implementation of dragEnter permits the default operation defined in event.detailto be performed on the current data type defined in event.currentDataType. For additional information see DropTargetListener.dragEnter.

Specified by:

dragEnter in interface DropTargetListener

Overrides:

dragEnter in class ViewerDropAdapter

Parameters:

event - the information associated with the drag enter event

See Also:

• DropTargetEvent

dragLeave

public void dragLeave(DropTargetEvent event)

Description copied from class: DropTargetAdapter

This implementation of dragLeave does nothing. For additional information see DropTargetListener.dragOperationChanged.

Specified by:

dragLeave in interface DropTargetListener

Overrides:

dragLeave in class DropTargetAdapter

Parameters:

event - the information associated with the drag leave event

See Also:

• DropTargetEvent

performDrop

public boolean performDrop(Object data)

Description copied from class: ViewerDropAdapter

Performs any work associated with the drop.

Subclasses must implement this method to provide drop behavior.

Overrides:

performDrop in class PluginDropAdapter

Parameters:

data - the drop data

Returns:

true if the drop was successful, and false otherwise

See Also:

• ViewerDropAdapter.performDrop(java.lang.Object)

validateDrop

public boolean validateDrop(Object aDropTarget,
 int theDropOperation,
 TransferData theTransferData)

Description copied from class: PluginDropAdapter

The PluginDropAdapter implementation of this ViewerDropAdapter method is used to notify the action that some aspect of the drop operation has changed. Subclasses may override.

Overrides:

validateDrop in class PluginDropAdapter

Parameters:

aDropTarget - the object that the mouse is currently hovering over, or null if the mouse is hovering over empty space

theDropOperation - the current drag operation (copy, move, etc.)

theTransferData - the current transfer type

Returns:

true if the drop is valid, and false otherwise

getBounds

public Rectangle getBounds(Item item)

Description copied from class: ViewerDropAdapter

Returns the bounds of the given SWT tree or table item.

Overrides:

getBounds in class ViewerDropAdapter

Parameters:

item - the SWT Item

Returns:

the bounds, or null if it is not a known type of item

getCurrentLocation

public int getCurrentLocation()

Description copied from class: ViewerDropAdapter

Returns a constant describing the position of the mouse relative to the target (before, on, or after the target.

Overrides:

getCurrentLocation in class ViewerDropAdapter

Returns:

one of the LOCATION_* constants defined in this type

getCurrentOperation

public int getCurrentOperation()

Description copied from class: ViewerDropAdapter

Returns the current operation.

Overrides:

getCurrentOperation in class ViewerDropAdapter

Returns:

a DROP_* constant from class DND

See Also:

• DND.DROP_COPY
• DND.DROP_MOVE
• DND.DROP_LINK
• DND.DROP_NONE

overrideOperation

public void overrideOperation(int operation)

Description copied from class: ViewerDropAdapter

Overrides the current operation for a drop that happens immediately after the current validateDrop. This maybe called only from within a ViewerDropAdapter.validateDrop(Object, int, TransferData) method

Overrides:

overrideOperation in class ViewerDropAdapter

Parameters:

operation - the operation to be used for the drop.

Since:

3.4

See Also:

• ViewerDropAdapter.overrideOperation(int)

getCurrentTarget

public Object getCurrentTarget()

Description copied from class: ViewerDropAdapter

Returns the target object currently under the mouse.

Overrides:

getCurrentTarget in class ViewerDropAdapter

Returns:

the current target object

getCurrentTransfer

public TransferData getCurrentTransfer()

Description copied from class: PluginDropAdapter

Returns the current transfer.

Overrides:

getCurrentTransfer in class PluginDropAdapter