Qt Documentation

Qt 5.8
Qt Widgets
Undo Framework

Undo Framework

Qt's undo framework is an implementation of the Command pattern, which provides advanced undo/redo functionality.

To show the abilities of the framework, we have implemented a small diagram application in which the diagram items are geometric primitives. You can edit the diagram in the following ways: add, move, change the color of, and delete the items.

Files:

tools/undo/commands.cpp
tools/undo/commands.h
tools/undo/document.cpp
tools/undo/document.h
tools/undo/mainwindow.cpp
tools/undo/mainwindow.h
tools/undo/mainwindow.ui
tools/undo/main.cpp
tools/undo/undo.pro
tools/undo/undo.qrc

© 2017 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.