UndoManager

A generic manager for undoing/redoing edits on a PdfFragment. This can be retrieved using getUndoManager.

Functions

Adds an OnUndoHistoryChangeListener for being notified of changes to the undo manager's edit history (i.e.

abstract fun canRedo(): Boolean

Returns whether there are edits that can be redone or not.

abstract fun canUndo(): Boolean

Returns whether there are edits that can be undone or not.

abstract fun clearHistory()

Clears the history of all currently recorded edits.

abstract fun redo()

Redoes the next edit or throws an exception if a redo operation is not possible.

Removes a previously added OnUndoHistoryChangeListener.

abstract fun undo()

Undoes the last edit or throws an exception if an undo operation is not possible.