Hi Ask26,
Currently there’s isn’t an option to determine the dragging mode of the tasks. Timeline tasks are dragged freely.
However I can suggest something that might be usefull in this situation. You can bind to the dragEnd event and if the desired dateStart/dateEnd from the dragging process is not what you need, you can change it via the updateTask method. Using this approach you can apply some kind of custom validation to the dateStart/dateEnd of a task after dragging is finished.
Best Regards,
Smart HTML Elements Team