ImageGear for C and C++ on Windows v19.0
Manage Undo History

All undo records are managed by the ARTX component in an undo actions list.

To use the Undo functionality, it is necessary to enable it first; use IG_ARTX_page_undo_enable to toggle this functionality. Use IG_ARTX_page_undo_is_enabled to determine if the Undo/Redo functionality is enabled.

When enabled, the history will record the following ArtX editing operations:

Recording of undo history may be a memory consuming operation. Use IG_ARTX_page_undo_action_enable to control which ArtX operations are recorded in the history to allow undo. The function to query which ArtX operations will be recorded is IG_ARTX_page_undo_action_is_enabled.

To get the number of undo records in the undo actions list, call the IG_ARTX_page_undo_count function. To clear the undo actions list, call the IG_ARTX_page_undo_clear function.

To perform an undo operation on an ArtX page call IG_ARTX_page_undo. This will undo the last annotation operation performed to the page. Successive calls will work backwards on the undo actions list until it is empty.

 

 


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