Back to using this blog (before I move somewhere else again)!
Let's start with something simple: @GrahamChiu was interested to see how to do drag'n'drop in R3GUI. Here is it:
Let's start with something simple: @GrahamChiu was interested to see how to do drag'n'drop in R3GUI. Here is it:
Some explanation
DRAGGER is style used for dragging. It's simple box, but you can use anything you want.Dragger / on-click
You need to defineON-CLICK actor to catch MOUSE-DOWN event:on-click: [
if arg/type = 'down [
return init-drag face arg/offset
]
]
Dragger / on-drag
You also need to addON-DRAG actor to process movement:on-drag: [
face/gob/offset: arg/offset - arg/base
show face/gob
]
ON-CLICK actor with INIT-DRAG function.
The drag object holds original position and new offset (and also some other fields that are not interesting for this simple tutorial).Dropper / on-drop
For faces that accept ourDRAGGER face we need to implement ON-DROP actor:on-drop: [
append-content face arg/face
return true
]
DRAGGER face to target panel and returns TRUE to indicate everything went well.Notes
If you drop theDRAGGER on face that has no ON-DROP defined, DRAGGER will return to original position automatically. 
