Pleaaase, is it possible to set the parameter "liveTracking" to "True" when calling the CreateScrollBarControl() API from the Gadget library of PB ? ... so that we can have a "Live ScrollBar" when using the SetControlAction() API to assign a callback function to it.
This already works with PB "TrackBar Gadget", so i assume it is created with the CreateSliderControl() API with the "liveTracking" parameter set to "True".
Code sample to illustrate this (try to drag the sliders/scrollbars) :
Code:
ImportC "/System/Library/Frameworks/Carbon.framework/Carbon"
NewControlActionUPP.l(*userRoutine)
SetControlAction(theControl.l, actionProc.l)
CreateScrollBarControl(window.l, *boundsRect, value.l, minimum.l, maximum.l, viewSize.l, liveTracking.b, liveTrackingProc.l, *outControl)
ShowControl(theControl.l)
EndImport
Structure Rect
top.w
left.w
bottom.w
right.w
EndStructure
OpenWindow(0, 100, 100, 500, 200, "Test")
TrackBarGadget(0, 10, 10, 200, 20, 0, 10)
TextGadget(1, 230, 10, 200, 20, "'normal' slider")
TrackBarGadget(2, 10, 50, 200, 20, 0, 10)
TextGadget(3, 230, 50, 200, 20, "'live' slider")
ScrollBarGadget(4, 10, 90, 200, 20, 0, 10, 1)
TextGadget(5, 230, 90, 200, 20, "'normal' scrollbar")
ScrollBarGadget(6, 10, 130, 200, 20, 0, 10, 1)
TextGadget(7, 230, 130, 200, 20, "'live' scrollbar (does not work)")
Rect.Rect : Rect\left = 10 : Rect\top = 170 : Rect\right = 210 : Rect\bottom = 190
CreateScrollBarControl(WindowID(0), @Rect, 0, 0, 10, 1, #True, #Null, @APIScrollBar)
ShowControl(APIScrollBar)
TextGadget(8, 230, 170, 200, 20, "API created 'live' scrollbar")
ProcedureCDLL LiveTrackingProc()
EndProcedure
ControlActionUPP = NewControlActionUPP(@LiveTrackingProc())
SetControlAction(GadgetID(2), ControlActionUPP)
SetControlAction(GadgetID(6), ControlActionUPP)
SetControlAction(APIScrollBar, ControlActionUPP)
Repeat : Until WaitWindowEvent() = #PB_Event_CloseWindow
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) but this change would save me a lot of API calls, and only requires a 5 second fix from PB team 
