Fixed parent function return ownership.

Fixed QMainWindow functions ownership.

Fixes #241.

Reviewer: Hugo Parente Lima <hugo.lima@openbossa.org>,
          Marcelo Lira <marcelo.lira@openbossa.org>

PySide/QtCore/typesystem_core.xml

@@ -1049,6 +1049,9 @@
       <modify-argument index="this">
         <parent index="return" action="add"/>
       </modify-argument>
+      <modify-argument index="return">
+        <define-ownership class="target" owner="default"/>
+      </modify-argument>
     </modify-function>
     <modify-function signature="setParent(QObject*)">
       <modify-argument index="this">

PySide/QtGui/typesystem_gui_common.xml

@@ -1260,12 +1260,12 @@
       </modify-argument>
     </modify-function>
     <modify-function signature="parentWidget() const">
-        <modify-argument index="return">
-          <define-ownership owner="target"/>
-        </modify-argument>
         <modify-argument index="this">
           <parent index="return" action="add"/>
         </modify-argument>
+        <modify-argument index="return">
+          <define-ownership class="target" owner="default"/>
+        </modify-argument>
     </modify-function>
     <modify-function signature="setMatrix(QMatrix, bool)" remove="all"/>
     <modify-function signature="paint(QPainter*,const QStyleOptionGraphicsItem*,QWidget*)">
@@ -1689,26 +1689,46 @@
   </object-type>
   <object-type name="QMainWindow">
     <modify-function signature="setCentralWidget(QWidget*)">
-      <modify-argument index="1">
+       <inject-code class="target" position="beginning">
-        <parent index="this" action="add"/>
+         <insert-template name="replace_child">
-      </modify-argument>
+           <replace from="$FUNCTION_GET_OLD" to="centralWidget" />
+           <replace from="$CHILD_TYPE" to="QWidget" />
+           <replace from="$PYARG" to="%PYARG_1" />
+         </insert-template>
+       </inject-code>
     </modify-function>
+
     <modify-function signature="setMenuBar(QMenuBar*)">
-      <modify-argument index="1">
+       <inject-code class="target" position="beginning">
-        <parent index="this" action="add"/>
+         <insert-template name="replace_child">
-      </modify-argument>
+           <replace from="$FUNCTION_GET_OLD" to="menuBar" />
-    </modify-function>
+           <replace from="$CHILD_TYPE" to="QMenuBar" />
+           <replace from="$PYARG" to="%PYARG_1" />
+         </insert-template>
+       </inject-code>
+   </modify-function>
+
     <modify-function signature="setMenuWidget(QWidget*)">
-      <modify-argument index="1">
+       <inject-code class="target" position="beginning">
-        <parent index="this" action="add"/>
+         <insert-template name="replace_child">
-      </modify-argument>
+           <replace from="$FUNCTION_GET_OLD" to="menuWidget" />
+           <replace from="$CHILD_TYPE" to="QWidget" />
+           <replace from="$PYARG" to="%PYARG_1" />
+         </insert-template>
+       </inject-code>
     </modify-function>
+
     <modify-function signature="setStatusBar(QStatusBar*)">
-      <modify-argument index="1">
+       <inject-code class="target" position="beginning">
-        <parent index="this" action="add"/>
+         <insert-template name="replace_child">
-      </modify-argument>
+           <replace from="$FUNCTION_GET_OLD" to="statusBar" />
-    </modify-function>
+           <replace from="$CHILD_TYPE" to="QStatusBar" />
-    <modify-function signature="addDockWidget(Qt::DockWidgetArea, QDockWidget*)">
+           <replace from="$PYARG" to="%PYARG_1" />
+         </insert-template>
+       </inject-code>
+   </modify-function>
+
+   <modify-function signature="addDockWidget(Qt::DockWidgetArea, QDockWidget*)">
       <modify-argument index="2">
         <parent index="this" action="add"/>
       </modify-argument>

PySide/typesystem_templates.xml

@@ -1,5 +1,14 @@
 <?xml version="1.0"?>
 <typesystem>
+    <template name="replace_child">
+        $CHILD_TYPE* oldChild = %CPPSELF.$FUNCTION_GET_OLD();
+        if (oldChild) {
+            Shiboken::AutoDecRef pyChild(%CONVERTTOPYTHON[$CHILD_TYPE*](oldChild));
+            Shiboken::setParent(NULL, pyChild);
+        }
+        Shiboken::setParent(%PYSELF, $PYARG);
+    </template>
+
     <!-- Templates to fix bool* parameters -->
     <template name="fix_bool*">
         bool ok_;

tests/QtGui/qmainwindow_test.py

@@ -17,6 +17,14 @@ class MainWindow(QtGui.QMainWindow):
         pointerToolbar = self.addToolBar("Pointer type")
         pointerToolbar.addWidget(pointerButton)
 
+class MyButton(QtGui.QPushButton):
+    def __init__(self, parent=None):
+        QtGui.QPushButton.__init__(self)
+        self._called = False
+
+    def myCallback(self):
+        self._called = True
+
 
 class TestMainWindow(UsesQApplication):
 
@@ -26,6 +34,40 @@ class TestMainWindow(UsesQApplication):
         QtCore.QTimer.singleShot(1000, self.app.quit)
         self.app.exec_()
 
+    def testRefCountToNull(self):
+        w = QtGui.QMainWindow()
+        c = QtGui.QWidget()
+        self.assertEqual(sys.getrefcount(c), 2)
+        w.setCentralWidget(c)
+        self.assertEqual(sys.getrefcount(c), 3)
+        w.setCentralWidget(None)
+        self.assertEqual(sys.getrefcount(c), 2)
+
+    def testRefCountToAnother(self):
+        w = QtGui.QMainWindow()
+        c = QtGui.QWidget()
+        self.assertEqual(sys.getrefcount(c), 2)
+        w.setCentralWidget(c)
+        self.assertEqual(sys.getrefcount(c), 3)
+
+        c2 = QtGui.QWidget()
+        w.setCentralWidget(c2)
+        self.assertEqual(sys.getrefcount(c), 2)
+        self.assertEqual(sys.getrefcount(c2), 3)
+
+    def testSignalDisconect(self):
+        w = QtGui.QMainWindow()
+        b = MyButton("button")
+        b.clicked.connect(b.myCallback)
+        w.setCentralWidget(b)
+
+        b = MyButton("button")
+        b.clicked.connect(b.myCallback)
+        w.setCentralWidget(b)
+
+        b.click()
+        self.assertEqual(b._called, True)
+
 
 if __name__ == '__main__':
     unittest.main()