shiboken: Introduce a function to get the type name of a polymorphic class

Helps for hierarchies that do not have virtual destructors where the
default typeid(t).name() does not work (QStyleOption).

Fixes: PYSIDE-1909
Change-Id: I9ce3769a8c3550d011023597eede0ae6f8c9ad68
Reviewed-by: Christian Tismer <tismer@stackless.com>
(cherry picked from commit de5f162a70dda9d74cfce2337a9f90ddcb4ca75f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

4 files changed, 130 insertions, 1 deletions

diff --git a/sources/pyside6/PySide6/QtWidgets/typesystem_widgets_common.xml b/sources/pyside6/PySide6/QtWidgets/typesystem_widgets_common.xml
index 667eb0f07..917e3eebf 100644
--- a/sources/pyside6/PySide6/QtWidgets/typesystem_widgets_common.xml
+++ b/sources/pyside6/PySide6/QtWidgets/typesystem_widgets_common.xml
@@ -88,7 +88,10 @@
   <function signature="qDrawPlainRect(QPainter*,int,int,int,int,const QColor&amp;,int,const QBrush*)"/>
   <function signature="qDrawPlainRect(QPainter*,const QRect&amp;,const QColor&amp;,int,const QBrush*)"/>
 
-  <object-type name="QStyleOption" polymorphic-id-expression="%1-&gt;type == QStyleOption::SO_Default">
+  <object-type name="QStyleOption" polymorphic-id-expression="%1-&gt;type == QStyleOption::SO_Default"
+               polymorphic-name-function="styleOptionType">
+    <inject-code class="native" position="beginning" file="../glue/qtwidgets.cpp"
+                 snippet="qstyleoption-typename"/>
     <enum-type name="OptionType"/>
     <enum-type name="StyleOptionType"/>
     <enum-type name="StyleOptionVersion"/>
diff --git a/sources/pyside6/PySide6/glue/qtwidgets.cpp b/sources/pyside6/PySide6/glue/qtwidgets.cpp
index 7511e89cc..b355f41cb 100644
--- a/sources/pyside6/PySide6/glue/qtwidgets.cpp
+++ b/sources/pyside6/PySide6/glue/qtwidgets.cpp
@@ -719,6 +719,63 @@ QAction *cppResult = %CPPSELF.exec(%1, %2, %3, %4);
 %PYARG_0 = %CONVERTTOPYTHON[QAction*](cppResult);
 // @snippet qmenu-exec-3
 
+// @snippet qstyleoption-typename
+const char *styleOptionType(const QStyleOption *o)
+{
+    switch (o->type) {
+    case QStyleOption::SO_Default:
+        break;
+    case QStyleOption::SO_FocusRect:
+        return "StyleOptionFocusRect";
+    case QStyleOption::SO_Button:
+        return "StyleOptionButton";
+    case QStyleOption::SO_Tab:
+        return "StyleOptionTab";
+    case QStyleOption::SO_MenuItem:
+        return "StyleOptionMenuItem";
+    case QStyleOption::SO_Frame:
+        return "StyleOptionFrame";
+    case QStyleOption::SO_ProgressBar:
+        return "StyleOptionProgressBar";
+    case QStyleOption::SO_ToolBox:
+        return "StyleOptionToolBox";
+    case QStyleOption::SO_Header:
+        return "StyleOptionHeader";
+    case QStyleOption::SO_DockWidget:
+        return "StyleOptionDockWidget";
+    case QStyleOption::SO_ViewItem:
+        return "StyleOptionViewItem";
+    case QStyleOption::SO_TabWidgetFrame:
+        return "StyleOptionTabWidgetFrame";
+    case QStyleOption::SO_TabBarBase:
+        return "StyleOptionTabBarBase";
+    case QStyleOption::SO_RubberBand:
+        return "StyleOptionRubberBand";
+    case QStyleOption::SO_ToolBar:
+        return "StyleOptionToolBar";
+    case QStyleOption::SO_GraphicsItem:
+        return "StyleOptionGraphicsItem";
+    case QStyleOption::SO_Slider:
+        return "StyleOptionSlider";
+    case QStyleOption::SO_SpinBox:
+        return "StyleOptionSpinBox";
+    case QStyleOption::SO_ToolButton:
+        return "StyleOptionToolButton";
+    case QStyleOption::SO_ComboBox:
+        return "StyleOptionComboBox";
+    case QStyleOption::SO_TitleBar:
+        return "StyleOptionTitleBar";
+    case QStyleOption::SO_GroupBox:
+        return "StyleOptionGroupBox";
+    case QStyleOption::SO_SizeGrip:
+        return "StyleOptionSizeGrip";
+    default:
+        break;
+    }
+    return "QStyleOption";
+}
+// @snippet qstyleoption-typename
+
 /*********************************************************************
  * CONVERSIONS
  ********************************************************************/
diff --git a/sources/pyside6/tests/QtWidgets/CMakeLists.txt b/sources/pyside6/tests/QtWidgets/CMakeLists.txt
index 8978df9a4..5989c0625 100644
--- a/sources/pyside6/tests/QtWidgets/CMakeLists.txt
+++ b/sources/pyside6/tests/QtWidgets/CMakeLists.txt
@@ -106,6 +106,7 @@ PYSIDE_TEST(qpicture_test.py)
 PYSIDE_TEST(qpushbutton_test.py)
 PYSIDE_TEST(qsplitter_test.py)
 PYSIDE_TEST(qstyle_test.py)
+PYSIDE_TEST(qstyleoption_test.py)
 PYSIDE_TEST(qtableview_test.py)
 PYSIDE_TEST(qtabwidget_test.py)
 PYSIDE_TEST(qtabwidgetclear_test.py)
diff --git a/sources/pyside6/tests/QtWidgets/qstyleoption_test.py b/sources/pyside6/tests/QtWidgets/qstyleoption_test.py
new file mode 100644
index 000000000..2cbdfcfbd
--- /dev/null
+++ b/sources/pyside6/tests/QtWidgets/qstyleoption_test.py
@@ -0,0 +1,68 @@
+#############################################################################
+##
+## Copyright (C) 2022 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the test suite of Qt for Python.
+##
+## $QT_BEGIN_LICENSE:GPL-EXCEPT$
+## 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.
+##
+## GNU General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU
+## General Public License version 3 as published by the Free Software
+## Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+## included in the packaging of this file. Please review the following
+## information to ensure the GNU General Public License requirements will
+## be met: https://www.gnu.org/licenses/gpl-3.0.html.
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+import sys
+import os
+import unittest
+
+from pathlib import Path
+sys.path.append(os.fspath(Path(__file__).resolve().parents[1]))
+from init_paths import init_test_paths
+init_test_paths(False)
+
+from helper.usesqapplication import UsesQApplication
+
+from PySide6.QtWidgets import (QApplication, QCommonStyle, QPushButton)
+
+
+text = ''
+
+
+class Style(QCommonStyle):
+
+    def drawControl(self, element, option, painter, widget=None):
+        # This should be a QStyleOptionButton with a "text" field
+        global text
+        text = option.text
+
+
+class StyleOptionTest(UsesQApplication):
+    '''PYSIDE-1909: Test cast to derived style option classes.'''
+
+    def testStyle(self):
+        global text
+        button = QPushButton("Hello World")
+        button.setStyle(Style())
+        button.show()
+        while not text:
+            QApplication.processEvents()
+        self.assertEqual(text, button.text())
+
+
+if __name__ == '__main__':
+    unittest.main()