Class DropTargetEffect

java.lang.Object
org.eclipse.swt.dnd.DropTargetAdapter
org.eclipse.swt.dnd.DropTargetEffect
All Implemented Interfaces:
EventListener, DropTargetListener, SWTEventListener
Direct Known Subclasses:
StyledTextDropTargetEffect, TableDropTargetEffect, TreeDropTargetEffect

public class DropTargetEffect extends DropTargetAdapter
This class provides a default drag under effect during a drag and drop. The current implementation does not provide any visual feedback.

The drop target effect has the same API as the DropTargetAdapter so that it can provide custom visual feedback when a DropTargetEvent occurs.

Classes that wish to provide their own drag under effect can extend the DropTargetEffect and override any applicable methods in DropTargetAdapter to display their own drag under effect.

The feedback value is either one of the FEEDBACK constants defined in class DND which is applicable to instances of this class, or it must be built by bitwise OR'ing together (that is, using the int "|" operator) two or more of those DND effect constants.

Feedback:
FEEDBACK_EXPAND, FEEDBACK_INSERT_AFTER, FEEDBACK_INSERT_BEFORE, FEEDBACK_NONE, FEEDBACK_SELECT, FEEDBACK_SCROLL
Since:
3.3
See Also:
  • Constructor Details

    • DropTargetEffect

      public DropTargetEffect(Control control)
      Creates a new DropTargetEffect to handle the drag under effect on the specified Control.
      Parameters:
      control - the Control over which the user positions the cursor to drop the data
      Throws:
      IllegalArgumentException -
      • ERROR_NULL_ARGUMENT - if the control is null
  • Method Details

    • getControl

      public Control getControl()
      Returns the Control which is registered for this DropTargetEffect. This is the control over which the user positions the cursor to drop the data.
      Returns:
      the Control which is registered for this DropTargetEffect
    • getItem

      public Widget getItem(int x, int y)
      Returns the item at the given x-y coordinate in the receiver or null if no such item exists. The x-y coordinate is in the display relative coordinates.
      Parameters:
      x - the x coordinate used to locate the item
      y - the y coordinate used to locate the item
      Returns:
      the item at the given x-y coordinate, or null if the coordinate is not in a selectable item