Sack Library Documentation
sack::PSI::OnMotionCommon Macro
void (__cdecl * PositionChanging)(PSI_CONTROL pc, LOGICAL bStart);
#define OnMotionCommon(name) \
    __DefineRegistryMethodP(PSI_PRELOAD_PRIORITY,PSI_ROOT_REGISTRY,unused_name,WIDE("control"),name WIDE("/rtti"),WIDE("some_parents_position_changing"),void,(PSI_CONTROL,LOGICAL), __LINE__)

move_starting is TRUE when the position starts changing and is false when the change is done... this allows a critical section to be entered and left around the resize.

Registers under 


static void OnMotionCommon(name)( PSI_CONTROL control, LOGICAL move_starting )
    if( move_starting )
       // move is starting, but still in old location
       // move has completed and control is in its target location.
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