TreeDropTargetEffect

This class provides a default drag under effect (eg. select, insert, scroll and expand) when a drag occurs over a <code>Tree</code>.

Classes that wish to provide their own drag under effect for a <code>Tree</code> can extend the <code>TreeDropTargetEffect</code> class and override any applicable methods in <code>TreeDropTargetEffect</code> to display their own drag under effect.

Subclasses that override any methods of this class must call the corresponding <code>super</code> method to get the default drag under effect implementation.

The feedback value is either one of the FEEDBACK constants defined in class <code>DND</code> which is applicable to instances of this class, or it must be built by bitwise OR'ing together (that is, using the <code>int</code> "|" operator) two or more of those <code>DND</code> effect constants. <dl> <dt>Feedback:</dt> <dd>FEEDBACK_SELECT, FEEDBACK_INSERT_BEFORE, FEEDBACK_INSERT_AFTER, FEEDBACK_EXPAND, FEEDBACK_SCROLL</dd> </dl> Note: Only one of the styles FEEDBACK_SELECT, FEEDBACK_INSERT_BEFORE or FEEDBACK_INSERT_AFTER may be specified.

@see DropTargetAdapter @see DropTargetEvent @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>

@since 3.3

class TreeDropTargetEffect : DropTargetEffect {

int SCROLL_HYSTERESIS;

int EXPAND_HYSTERESIS;

int scrollIndex;

long scrollBeginTime;

int expandIndex;

long expandBeginTime;

this(Tree tree);

void dragEnter(DropTargetEvent event);

void dragLeave(DropTargetEvent event);

void dragOver(DropTargetEvent event);

}

Constructors

this this(Tree tree): Creates a new <code>TreeDropTargetEffect</code> to handle the drag under effect on the specified <code>Tree</code>.

Members

Functions

dragEnter void dragEnter(DropTargetEvent event): This implementation of <code>dragEnter</code> provides a default drag under effect for the feedback specified in <code>event.feedback</code>.
dragLeave void dragLeave(DropTargetEvent event): This implementation of <code>dragLeave</code> provides a default drag under effect for the feedback specified in <code>event.feedback</code>.
dragOver void dragOver(DropTargetEvent event): This implementation of <code>dragOver</code> provides a default drag under effect for the feedback specified in <code>event.feedback</code>.

Inherited Members

From DropTargetEffect

getControl 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.
getItem 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.