go-iup
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Canvas specific callbacks
http://www.tecgraf.puc-rio.br/iup/en/elem/iupcanvas.html#Callbacks
ACTION, BUTTON_CB, DROPFILES_CB, FOCUS_CB, MOTION_CB, KEYPRESS_CB, RESIZE_CB, SCROLL_CB, TOUCH_CB, MULTITOUCH_CB, WHEEL_CB, WOM_CB