Hi Peter! > 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?
I first thought this would be easy. But actually it is not. The way to achieve the snap on grid behavior is to have an indirection in the Trachel classes. Each trachel shape knows its position (the position is contained in the matrix attached to each shape). The snap-on-grid means you need to slightly process the matrix coordinate. Maybe there are other way to do this, but it does not look like. Changing Trachel because of this seems a bit overkill... Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. On Jul 31, 2014, at 3:58 PM, Peter Uhnák <i.uh...@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
