1 files changed, 120 insertions, 0 deletions
diff --git a/sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_gui_util_qundostack.cpp b/sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_gui_util_qundostack.cpp
new file mode 100644
index 000000000..9d1196790
--- /dev/null
+++ b/sources/pyside2/doc/codesnippets/doc/src/snippets/code/src_gui_util_qundostack.cpp
@@ -0,0 +1,120 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of PySide2.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//! [0]
+class AppendText(QUndoCommand):
+    self.m_document = ''
+    self.m_text = ''
+
+    def AppendText(self, doc, text):
+        self.m_document = doc
+        self.m_text = text
+        self.setText("append text")
+
+    def undo(self):
+        self.m_document.chop(self.m_text.length())
+
+    def redo(self):
+        self.m_document->append(self.m_text)
+//! [0]
+
+
+//! [1]
+command1 = MyCommand()
+stack.push(command1)
+command2 = MyCommand()
+stack.push(command2)
+
+stack.undo()
+
+command3 = MyCommand()
+stack.push(command3) # command2 gets deleted
+//! [1]
+
+
+//! [2]
+insertRed = QUndoCommand() # an empty command
+insertRed.setText("insert red text")
+
+InsertText(document, idx, text, insertRed) # becomes child of insertRed
+SetColor(document, idx, text.length(), Qt.red, insertRed)
+
+stack.push(insertRed)
+//! [2]
+
+
+//! [3]
+class AppendText(QUndoCommand):
+    ...
+    def mergeWith(self, other):
+        if other.id() != self.id(): # make sure other is also an AppendText command
+            return False
+        m_text += other.m_text
+        return True
+//! [3]
+
+
+//! [4]
+stack.beginMacro("insert red text")
+stack.push(InsertText(document, idx, text))
+stack.push(SetColor(document, idx, text.length(), Qt.red))
+stack.endMacro() # indexChanged() is emitted
+//! [4]
+
+
+//! [5]
+insertRed = QUndoCommand() # an empty command
+insertRed.setText("insert red text")
+
+InsertText(document, idx, text, insertRed) # becomes child of insertRed
+SetColor(document, idx, text.length(), Qt.red, insertRed)
+
+stack.push(insertRed)
+//! [5]