Adds an entity to the current undo block

Adds a function to call when the current undo block is undone. Note that if an undo has a function, the player will always be notified when this undo is performed, even if the entity it is meant to undo no longer exists.

Begins a new undo entry

Processes an undo block (in table form). This is used internally by the undo manager when a player presses Z. You should use gm_undo or gm_undonum *num* console commands instead of calling this function directly.

Completes an undo entry, and registers it with the player's client

Serverside, returns a table containing all undo blocks of all players. Clientside, returns a table of the local player's undo blocks. Serverside, this table's keys use Player:UniqueID to store a player's undo blocks.

This is used internally - although you're able to use it you probably shouldn't. Makes the UI dirty - it will re-create the controls the next time it is viewed.

Replaces any instance of the "from" reference with the "to" reference, in any existing undo block. Returns true if something was replaced

Sets a custom undo text for the current undo block

Sets the player which the current undo block belongs to

This is used internally - although you're able to use it you probably shouldn't. Adds a hook (CPanelPaint) to the control panel paint function so we can determine when it is being drawn.