QLayoutItem - make controlTypes a virtual function.

Just implementing the ### Qt5 suggestion about making
controlTypes a virtual function.

Change-Id: Ic1db47fe488f089de965438e456e9b48e0b96f32
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>

src/widgets/kernel/qlayout.cpp

@@ -524,6 +524,19 @@ bool QLayout::isEmpty() const
     return true;
 }
 
+/*!
+    \reimp
+*/
+QSizePolicy::ControlTypes QLayout::controlTypes() const
+{
+    if (count() == 0)
+        return QSizePolicy::DefaultType;
+    QSizePolicy::ControlTypes types;
+    for (int i = count() - 1; i >= 0; --i)
+        types |= itemAt(i)->controlTypes();
+    return types;
+}
+
 /*!
     \reimp
 */

src/widgets/kernel/qlayout.h

@@ -131,6 +131,7 @@ public:
     virtual int indexOf(QWidget *) const;
     virtual int count() const = 0;
     bool isEmpty() const;
+    QSizePolicy::ControlTypes controlTypes() const;
 
     int totalHeightForWidth(int w) const;
     QSize totalMinimumSize() const;

src/widgets/kernel/qlayoutitem.cpp

@@ -414,17 +414,6 @@ int QLayoutItem::heightForWidth(int /* w */) const
 */
 QSizePolicy::ControlTypes QLayoutItem::controlTypes() const
 {
-    // ### Qt 5: This function should probably be virtual instead
-    if (const QWidget *widget = const_cast<QLayoutItem*>(this)->widget()) {
-        return widget->sizePolicy().controlType();
-    } else if (const QLayout *layout = const_cast<QLayoutItem*>(this)->layout()) {
-        if (layout->count() == 0)
-            return QSizePolicy::DefaultType;
-        QSizePolicy::ControlTypes types;
-        for (int i = layout->count() - 1; i >= 0; --i)
-            types |= layout->itemAt(i)->controlTypes();
-        return types;
-    }
     return QSizePolicy::DefaultType;
 }
 
@@ -688,6 +677,11 @@ bool QWidgetItem::isEmpty() const
     return wid->isHidden() || wid->isWindow();
 }
 
+QSizePolicy::ControlTypes QWidgetItem::controlTypes() const
+{
+    return wid->sizePolicy().controlType();
+}
+
 /*!
     \class QWidgetItemV2
     \internal

src/widgets/kernel/qlayoutitem.h

@@ -83,7 +83,7 @@ public:
 
     Qt::Alignment alignment() const { return align; }
     void setAlignment(Qt::Alignment a);
-    QSizePolicy::ControlTypes controlTypes() const;
+    virtual QSizePolicy::ControlTypes controlTypes() const;
 
 protected:
     Qt::Alignment align;
@@ -135,7 +135,7 @@ public:
 
     bool hasHeightForWidth() const;
     int heightForWidth(int) const;
-
+    QSizePolicy::ControlTypes controlTypes() const;
 protected:
     QWidget *wid;
 };

tests/auto/widgets/kernel/qlayout/tst_qlayout.cpp

@@ -52,6 +52,7 @@
 #include <QtWidgets/QFrame>
 #include <QtWidgets/QWindowsStyle>
 #include <QtWidgets/QSizePolicy>
+#include <QtWidgets/QComboBox>
 #include <QPushButton>
 #include <QRadioButton>
 #include <private/qlayoutengine_p.h>
@@ -77,6 +78,7 @@ private slots:
     void layoutItemRect();
     void warnIfWrongParent();
     void controlTypes();
+    void controlTypes2();
     void adjustSizeShouldMakeSureLayoutIsActivated();
 };
 
@@ -310,7 +312,16 @@ void tst_QLayout::controlTypes()
     QCOMPARE(layout.controlTypes(), QSizePolicy::DefaultType);
     QSizePolicy p;
     QCOMPARE(p.controlType(),QSizePolicy::DefaultType);
+}
 
+void tst_QLayout::controlTypes2()
+{
+    QWidget main;
+    QVBoxLayout *const layout = new QVBoxLayout(&main);
+    layout->setMargin(0);
+    QComboBox *combo = new QComboBox(&main);
+    layout->addWidget(combo);
+    QCOMPARE(layout->controlTypes(), QSizePolicy::ComboBox);
 }
 
 void tst_QLayout::adjustSizeShouldMakeSureLayoutIsActivated()