Cancels an operation during certain "pre" events.
Usage
Set_Property(OLECtrlEntID, "OLE.Cancel", Boolean)
Values
0, 1, or 2
Default: 0
Remarks
The Cancel property is automatically set to 0 before the OnDragStart or BeforeUpdate events are fired. These events fire when a user starts and operation but before the operation is truly applied. If the operation is not desired, then setting this property to 1 during the event will abort the operation. Note that this only works if you qualify the aforementioned events synchronously.
Setting this to 1 during the OnDragStart event cancels the drag completely.
Settings this to 1 or 2 during the BeforeUpdate prevents the item's data from updating but leaves the item in edit mode. If you set this to 1, the item stays in edit mode with the cursor at the end of the text. If you set this to 2, the item stays in edit mode with all the text selected.
Example
OLE_TREE.OnDragStart: // Get the list of items to be dragged Items = Param1 Convert ',' to @FM in Items // Don't allow users to drag if any of the items are of the "Group" class Cancel = 0 Pos = 1 Flag = "" Loop Remove Item From Items At Pos Setting Flag While Item NE "" AND Cancel EQ 0 Class = Get_Property(CtrlEntId, "OLE.ItemClass[":Item:"]") Cancel = Class _EQC "Group" Repeat // Cancel if need be Set_Property(CtrlEntId, "OLE.Cancel", Cancel) return
