Vcl.StdCtrls.TListBox.OnDragOver
Delphi
property OnDragOver;
C++
__property OnDragOver;
Properties
Type | Visibility | Source | Unit | Parent |
---|---|---|---|---|
event | published | Vcl.StdCtrls.pas Vcl.StdCtrls.hpp |
Vcl.StdCtrls | TListBox |
Description
Occurs when the user drags an object over a control.
Vcl.StdCtrls.TListBox.OnDragOver inherits from Vcl.Controls.TControl.OnDragOver. All content below this line refers to Vcl.Controls.TControl.OnDragOver.
Occurs when the user drags an object over a control.
Use an OnDragOver event to signal that the control can accept a dragged object so the user can drop or dock it.
Within the OnDragOver event handler, change the Accept
parameter to False to reject the dragged object. Leave Accept
as True to allow the user to drop or dock the dragged object on the control.
To change the shape of the cursor, indicating that the control can accept the dragged object, change the value of the DragCursor property for the control before the OnDragOver event occurs.
The Source
is the object being dragged, the Sender
is the potential drop or dock site, and X
and Y
are screen coordinates in pixels. The State
parameter specifies how the dragged object is moving over the control.
Accept
parameter defaults to True. However, if an OnDragOver event handler is not supplied, the control rejects the dragged object, as if the Accept
parameter were changed to False.OnDragOver is an event handler of type TDragOverEvent.
See Also
Code Examples