Action generated when the canvas size is changed.
int function(Ihandle *self, int width, int height); [in C] elem:resize(width, height: number) -> (ret: number) [in IupLua3] elem:resize_cb(width, height: number) -> (ret: number) [in IupLua5]self: identifier of the canvas that activated the function's execution.
width: new canvas width, in pixels.
height: new canvas height, in pixels.
This action is also generated right after the dialog is viewed by means of functions IupShow, IupShowXY or IupPopup.
In Windows, it is also generated after a map and before show.