QUndoCommand. The base class of all commands stored on a QUndoStack. QUndoGroup. Group of QUndoStack objects. QUndoStack. Stack of QUndoCommand objects. QUndoView. Displays the contents of a QUndoStack. QVBoxLayout. Lines up widgets vertically. QWhatsThis

QUndoCommand is the base class of all commands stored on an undo stack. It can apply (redo) or undo a single change in the document. QUndoStack is a list of QUndoCommand objects. It contains all the commands executed on the document and can roll the docum

Group of QUndoStack objects. QUndoCommand. The base class of all commands stored on a QUndoStack. QUndoStack. Stack of QUndoCommand objects. QUndoView. Displays the contents of a QUndoStack. QAbstractButton. The abstract base class of button widgets, prov