Addendum: generally when it comes to Mouse events, using TRMouse* events should be the way to go? E.g. I want to add a control point when I click somewhere on the line so I could subscribe for TRMouseRightClick announcement. My question however is whether using TRachert events is ok. Shouldn't this be handled at Roassal level as it was done in Roassal1 (ROMouseRightClick)?

On Thu, Jul 31, 2014 at 9:58 PM, Peter Uhn�k <i.uhnak@gmail.com> wrote:

While playing with RTMultiLine I thought that it would be nice to have option for RTDraggable elements to snap to a grid / move only by fixed increments - for example the position could only be divisible by 10 (grid size would be 10), so dragging from 20@10 to 26@4 would jump to 30@0. Is something like this possible with current implementation?

The second question is: is it possible for element to subscribe for position updates of another element? (I.e. element A watches for movement of element B and moves accordingly). I know I could add both of them to a composite shape or RTGroup (RTDraggable>>groupToDrag:), however I would prefer something more loosely coupled.

In RTDraggable>>initializeElement: i found

" element when: TRMouseDragging do: [ :e | e element translateBy: e step. e signalUpdate ]"

however it is commented out so perhaps there some other way?

Peter