UndoBuffer

Undo/Redo buffer

class UndoBuffer {

Collection!EditOperation _undoList;

Collection!EditOperation _redoList;

bool hasUndo [@property getter];

bool hasRedo [@property getter];

void saveForUndo(EditOperation op);

EditOperation undo();

EditOperation redo();

void clear();

EditOperation _savedState;

void saved();

bool savedInRedo();

bool modified [@property getter];

}

Members

Functions

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

Properties

hasRedo bool hasRedo [@property getter]: returns true if buffer contains any redo items
hasUndo bool hasUndo [@property getter]: returns true if buffer contains any undo items
modified bool modified [@property getter]: returns true if content has been changed since last saved() or clear() call

Variables

_redoList Collection!EditOperation _redoList;: Undocumented in source.
_savedState EditOperation _savedState;: Undocumented in source.
_undoList Collection!EditOperation _undoList;: Undocumented in source.

Meta

Source

See Implementation