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Notifies the widgetset class that a Drag operation is starting.
Source position: stdctrls.pp line 582
protected procedure TCustomListBox.BeforeDragStart; override; |
BeforeDragStart is an overridden method in TCustomListBox used to perform actions needed to start a drag operation for the control. In TCustomListBox, this means that the DragStart method in the widgetset class is called. No actions are performed in the method if the Handle has not been allocated for the control.
BeforeDragStart is called when mouse up, down, and move messages are handled by the DragManager for an application.
| Version 4.0 | Generated 2025-05-03 | Home |