Class UndoBuffer

Undo/Redo buffer

Fields

Name	Type	Description
_redoList	Collection!(dcanvas.core.editable.EditOperation,false)
_savedState	EditOperation
_undoList	Collection!(dcanvas.core.editable.EditOperation,false)

Properties

Name	Type	Description
hasRedo[get]	bool	returns true if buffer contains any redo items
hasUndo[get]	bool	returns true if buffer contains any undo items
modified[get]	bool	returns true if content has been changed since last saved() or clear() call

Methods

Name	Description
clear ()	clears both undo and redo buffers
redo ()	returns operation to be redone (put it to undo), null if no undo ops available
saved ()	current state is saved
savedInRedo ()	returns true if saved state is in redo buffer
saveForUndo (op)	adds undo operation
undo ()	returns operation to be undone (put it to redo), null if no undo ops available

Aliases

Name	Description
~this