ArtX class for processing ArtX GUI actions such as marks creation, selection, moving, and resizing.
| IG_ARTX_action_begin_creation | Creates GUI action object of type Mark Creation. |
| IG_ARTX_action_begin_edit | Creates GUI action object of type Mark Edit. |
| IG_ARTX_action_begin_move | Creates GUI action object of type Mark Move. |
| IG_ARTX_action_begin_resize | Creates GUI action object of type Mark Resize. |
| IG_ARTX_action_begin_selection | Creates GUI action object of type Selection. |
| IG_ARTX_action_draw | Performs drawing of GUI action. |
| IG_ARTX_action_end | Ends specified GUI action. |
| IG_ARTX_action_mouse_down | Passes mouse events to GUI action. It should be called when user presses mouse button. |
| IG_ARTX_action_mouse_move | Passes mouse events to GUI action. It should be called when user moves mouse pointer. |
| IG_ARTX_action_mouse_up | Passes mouse events to GUI action. It should be called when user releases mouse button. |
| IG_ARTX_action_type_get | Returns action's type. |