Called when some manipulation is made to the scrollbar. The canvas is automatically redrawn only if this callback is NOT defined.
(GTK 2.8) Also the POSX and POSY values will not be correctly updated for older GTK versions.
In Ubuntu, when liboverlay-scrollbar is enabled (the new tiny auto-hide scrollbar) only the IUP_SBPOSV and IUP_SBPOSH codes are used.
int function(Ihandle *ih, int op, float posx, float posy); [in C] ih:scroll_cb(op, posx, posy: number) -> (ret: number) [in Lua]
identifier of the element that activated the event.
op: indicates the operation performed on the scrollbar.
If the manipulation was made on the vertical scrollbar, it can have the following values:
IUP_SBUP - line up IUP_SBDN - line down IUP_SBPGUP - page up IUP_SBPGDN - page down IUP_SBPOSV - vertical positioning IUP_SBDRAGV - vertical drag
If it was on the horizontal scrollbar, the following values are valid:
IUP_SBLEFT - column left IUP_SBRIGHT - column right IUP_SBPGLEFT - page left IUP_SBPGRIGHT - page right IUP_SBPOSH - horizontal positioning IUP_SBDRAGH - horizontal drag
posx, posy: the same as the ACTION canvas callback (corresponding to the values of attributes POSX and POSY).
IUP_SBDRAGH and IUP_SBDRAGV are not supported in GTK. During drag IUP_SBPOSH and IUP_SBPOSV are used.
In Windows, after a drag when mouse is released IUP_SBPOSH or IUP_SBPOSV are called.
IupCanvas, IupGLCanvas, SCROLLBAR