nativestyle: refactor many functions to be const

Many of the virtual functions should be const, as
they should not modify the state of the item.

Change-Id: I94a7f9ae56204c8f8f737911e15d81f82d8add83
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

28 files changed, 102 insertions, 102 deletions

diff --git a/src/imports/nativestyle/items/qquickstyleitem.cpp b/src/imports/nativestyle/items/qquickstyleitem.cpp
index 6ca05f29..902ccea9 100644
--- a/src/imports/nativestyle/items/qquickstyleitem.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitem.cpp
@@ -89,7 +89,7 @@ QQuickStyleItem::~QQuickStyleItem()
 {
 }
 
-void QQuickStyleItem::connectToControl()
+void QQuickStyleItem::connectToControl() const
 {
     connect(m_control, &QQuickStyleItem::enabledChanged, this, &QQuickStyleItem::markImageDirty);
     connect(m_control, &QQuickItem::activeFocusChanged, this, &QQuickStyleItem::markImageDirty);
@@ -171,7 +171,7 @@ QStyle::State QQuickStyleItem::controlSize(QQuickItem *item)
     return QStyle::State_None;
 }
 
-void QQuickStyleItem::initStyleOptionBase(QStyleOption &styleOption)
+void QQuickStyleItem::initStyleOptionBase(QStyleOption &styleOption) const
 {
     Q_ASSERT(m_control);
 
@@ -478,7 +478,7 @@ qreal QQuickStyleItem::focusFrameRadius() const
     return m_styleItemGeometry.focusFrameRadius;
 }
 
-QFont QQuickStyleItem::styleFont(QQuickItem *control)
+QFont QQuickStyleItem::styleFont(QQuickItem *control) const
 {
     Q_ASSERT(control);
     // Note: This function should be treated as if it was static
diff --git a/src/imports/nativestyle/items/qquickstyleitem.h b/src/imports/nativestyle/items/qquickstyleitem.h
index 7fde3de9..5bb990f4 100644
--- a/src/imports/nativestyle/items/qquickstyleitem.h
+++ b/src/imports/nativestyle/items/qquickstyleitem.h
@@ -218,7 +218,7 @@ public:
     QSize imageSize() const;
     qreal focusFrameRadius() const;
 
-    Q_INVOKABLE virtual QFont styleFont(QQuickItem *control);
+    Q_INVOKABLE virtual QFont styleFont(QQuickItem *control) const;
 
     void markGeometryDirty();
     void markImageDirty();
@@ -237,14 +237,14 @@ protected:
     void itemChange(ItemChange change, const ItemChangeData &data) override;
     void updatePolish() override;
 
-    virtual void connectToControl();
-    virtual void paintEvent(QPainter *painter) = 0;
+    virtual void connectToControl() const;
+    virtual void paintEvent(QPainter *painter) const = 0;
     virtual StyleItemGeometry calculateGeometry() = 0;
 
     static QStyle::State controlSize(QQuickItem *item);
-    void initStyleOptionBase(QStyleOption &styleOption);
+    void initStyleOptionBase(QStyleOption &styleOption) const;
 
-    inline QSize contentSize() { return QSize(qCeil(m_contentSize.width()), qCeil(m_contentSize.height())); }
+    inline QSize contentSize() const { return QSize(qCeil(m_contentSize.width()), qCeil(m_contentSize.height())); }
     inline static QStyle *style() { return QQuickNativeStyle::style(); }
 
     template <class T> inline const T* control() const {
diff --git a/src/imports/nativestyle/items/qquickstyleitembutton.cpp b/src/imports/nativestyle/items/qquickstyleitembutton.cpp
index f3e2c3e1..5dfe060f 100644
--- a/src/imports/nativestyle/items/qquickstyleitembutton.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitembutton.cpp
@@ -36,12 +36,12 @@
 
 #include "qquickstyleitembutton.h"
 
-QFont QQuickStyleItemButton::styleFont(QQuickItem *control)
+QFont QQuickStyleItemButton::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_PushButtonLabel, controlSize(control));
 }
 
-void QQuickStyleItemButton::connectToControl()
+void QQuickStyleItemButton::connectToControl() const
 {
     QQuickStyleItem::connectToControl();
     auto button = control<QQuickButton>();
@@ -65,14 +65,14 @@ StyleItemGeometry QQuickStyleItemButton::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemButton::paintEvent(QPainter *painter)
+void QQuickStyleItemButton::paintEvent(QPainter *painter) const
 {
     QStyleOptionButton styleOption;
     initStyleOption(styleOption);
     style()->drawControl(QStyle::CE_PushButtonBevel, &styleOption, painter);
 }
 
-void QQuickStyleItemButton::initStyleOption(QStyleOptionButton &styleOption)
+void QQuickStyleItemButton::initStyleOption(QStyleOptionButton &styleOption) const
 {
     initStyleOptionBase(styleOption);
     auto button = control<QQuickButton>();
diff --git a/src/imports/nativestyle/items/qquickstyleitembutton.h b/src/imports/nativestyle/items/qquickstyleitembutton.h
index e23601a7..41ca0cf1 100644
--- a/src/imports/nativestyle/items/qquickstyleitembutton.h
+++ b/src/imports/nativestyle/items/qquickstyleitembutton.h
@@ -46,15 +46,15 @@ class QQuickStyleItemButton : public QQuickStyleItem
     QML_NAMED_ELEMENT(Button)
 
 public:
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 protected:
-    void connectToControl() override;
-    void paintEvent(QPainter *painter) override;
+    void connectToControl() const override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionButton &styleOption);
+    void initStyleOption(QStyleOptionButton &styleOption) const;
 };
 
 #endif // QQUICKSTYLEITEMBUTTON_H
diff --git a/src/imports/nativestyle/items/qquickstyleitemcheckbox.cpp b/src/imports/nativestyle/items/qquickstyleitemcheckbox.cpp
index f947caf4..6c4ac8ea 100644
--- a/src/imports/nativestyle/items/qquickstyleitemcheckbox.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemcheckbox.cpp
@@ -36,12 +36,12 @@
 
 #include "qquickstyleitemcheckbox.h"
 
-QFont QQuickStyleItemCheckBox::styleFont(QQuickItem *control)
+QFont QQuickStyleItemCheckBox::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_RadioButtonLabel, controlSize(control));
 }
 
-void QQuickStyleItemCheckBox::connectToControl()
+void QQuickStyleItemCheckBox::connectToControl() const
 {
     QQuickStyleItem::connectToControl();
     auto checkbox = control<QQuickCheckBox>();
@@ -69,14 +69,14 @@ StyleItemGeometry QQuickStyleItemCheckBox::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemCheckBox::paintEvent(QPainter *painter)
+void QQuickStyleItemCheckBox::paintEvent(QPainter *painter) const
 {
     QStyleOptionButton styleOption;
     initStyleOption(styleOption);
     style()->drawControl(QStyle::CE_CheckBox, &styleOption, painter);
 }
 
-void QQuickStyleItemCheckBox::initStyleOption(QStyleOptionButton &styleOption)
+void QQuickStyleItemCheckBox::initStyleOption(QStyleOptionButton &styleOption) const
 {
     initStyleOptionBase(styleOption);
     auto checkbox = control<QQuickCheckBox>();
diff --git a/src/imports/nativestyle/items/qquickstyleitemcheckbox.h b/src/imports/nativestyle/items/qquickstyleitemcheckbox.h
index a8ccda2c..03bf34b9 100644
--- a/src/imports/nativestyle/items/qquickstyleitemcheckbox.h
+++ b/src/imports/nativestyle/items/qquickstyleitemcheckbox.h
@@ -46,15 +46,15 @@ class QQuickStyleItemCheckBox : public QQuickStyleItem
     QML_NAMED_ELEMENT(CheckBox)
 
 public:
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 protected:
-    void connectToControl() override;
-    void paintEvent(QPainter *painter) override;
+    void connectToControl() const override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionButton &styleOption);
+    void initStyleOption(QStyleOptionButton &styleOption) const;
 };
 
 #endif // QQUICKSTYLEITEMCHECKBOX_H
diff --git a/src/imports/nativestyle/items/qquickstyleitemcombobox.cpp b/src/imports/nativestyle/items/qquickstyleitemcombobox.cpp
index 7841d062..0ac3756e 100644
--- a/src/imports/nativestyle/items/qquickstyleitemcombobox.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemcombobox.cpp
@@ -36,12 +36,12 @@
 
 #include "qquickstyleitemcombobox.h"
 
-QFont QQuickStyleItemComboBox::styleFont(QQuickItem *control)
+QFont QQuickStyleItemComboBox::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_PushButtonLabel, controlSize(control));
 }
 
-void QQuickStyleItemComboBox::connectToControl()
+void QQuickStyleItemComboBox::connectToControl() const
 {
     QQuickStyleItem::connectToControl();
     auto comboBox = control<QQuickComboBox>();
@@ -65,14 +65,14 @@ StyleItemGeometry QQuickStyleItemComboBox::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemComboBox::paintEvent(QPainter *painter)
+void QQuickStyleItemComboBox::paintEvent(QPainter *painter) const
 {
     QStyleOptionComboBox styleOption;
     initStyleOption(styleOption);
     style()->drawComplexControl(QStyle::CC_ComboBox, &styleOption, painter);
 }
 
-void QQuickStyleItemComboBox::initStyleOption(QStyleOptionComboBox &styleOption)
+void QQuickStyleItemComboBox::initStyleOption(QStyleOptionComboBox &styleOption) const
 {
     initStyleOptionBase(styleOption);
     auto comboBox = control<QQuickComboBox>();
diff --git a/src/imports/nativestyle/items/qquickstyleitemcombobox.h b/src/imports/nativestyle/items/qquickstyleitemcombobox.h
index f446b191..79f1995e 100644
--- a/src/imports/nativestyle/items/qquickstyleitemcombobox.h
+++ b/src/imports/nativestyle/items/qquickstyleitemcombobox.h
@@ -46,15 +46,15 @@ class QQuickStyleItemComboBox : public QQuickStyleItem
     QML_NAMED_ELEMENT(ComboBox)
 
 public:
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 protected:
-    void connectToControl() override;
-    void paintEvent(QPainter *painter) override;
+    void connectToControl() const override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionComboBox &styleOption);
+    void initStyleOption(QStyleOptionComboBox &styleOption) const;
 };
 
 #endif // QQUICKSTYLEITEMCOMBOBOX_H
diff --git a/src/imports/nativestyle/items/qquickstyleitemdial.cpp b/src/imports/nativestyle/items/qquickstyleitemdial.cpp
index 56357a7c..bf5784e1 100644
--- a/src/imports/nativestyle/items/qquickstyleitemdial.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemdial.cpp
@@ -36,12 +36,12 @@
 
 #include "qquickstyleitemdial.h"
 
-QFont QQuickStyleItemDial::styleFont(QQuickItem *control)
+QFont QQuickStyleItemDial::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_ProgressBarLabel, controlSize(control));
 }
 
-void QQuickStyleItemDial::connectToControl()
+void QQuickStyleItemDial::connectToControl() const
 {
     QQuickStyleItem::connectToControl();
     auto dial = control<QQuickDial>();
@@ -68,14 +68,14 @@ StyleItemGeometry QQuickStyleItemDial::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemDial::paintEvent(QPainter *painter)
+void QQuickStyleItemDial::paintEvent(QPainter *painter) const
 {
     QStyleOptionSlider styleOption;
     initStyleOption(styleOption);
     style()->drawComplexControl(QStyle::CC_Dial, &styleOption, painter);
 }
 
-void QQuickStyleItemDial::initStyleOption(QStyleOptionSlider &styleOption)
+void QQuickStyleItemDial::initStyleOption(QStyleOptionSlider &styleOption) const
 {
     initStyleOptionBase(styleOption);
     auto dial = control<QQuickDial>();
diff --git a/src/imports/nativestyle/items/qquickstyleitemdial.h b/src/imports/nativestyle/items/qquickstyleitemdial.h
index 3eefa734..569820fe 100644
--- a/src/imports/nativestyle/items/qquickstyleitemdial.h
+++ b/src/imports/nativestyle/items/qquickstyleitemdial.h
@@ -46,15 +46,15 @@ class QQuickStyleItemDial : public QQuickStyleItem
     QML_NAMED_ELEMENT(Dial)
 
 public:
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 protected:
-    void connectToControl() override;
-    void paintEvent(QPainter *painter) override;
+    void connectToControl() const override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionSlider &styleOption);
+    void initStyleOption(QStyleOptionSlider &styleOption) const;
 };
 
 #endif // QQUICKSTYLEITEMDIAL_H
diff --git a/src/imports/nativestyle/items/qquickstyleitemframe.cpp b/src/imports/nativestyle/items/qquickstyleitemframe.cpp
index 42a6c231..cf060492 100644
--- a/src/imports/nativestyle/items/qquickstyleitemframe.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemframe.cpp
@@ -51,14 +51,14 @@ StyleItemGeometry QQuickStyleItemFrame::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemFrame::paintEvent(QPainter *painter)
+void QQuickStyleItemFrame::paintEvent(QPainter *painter) const
 {
     QStyleOptionFrame styleOption;
     initStyleOption(styleOption);
     style()->drawControl(QStyle::CE_ShapedFrame, &styleOption, painter);
 }
 
-void QQuickStyleItemFrame::initStyleOption(QStyleOptionFrame &styleOption)
+void QQuickStyleItemFrame::initStyleOption(QStyleOptionFrame &styleOption) const
 {
     initStyleOptionBase(styleOption);
     styleOption.lineWidth = 1;
diff --git a/src/imports/nativestyle/items/qquickstyleitemframe.h b/src/imports/nativestyle/items/qquickstyleitemframe.h
index 70063ed6..8e8da68b 100644
--- a/src/imports/nativestyle/items/qquickstyleitemframe.h
+++ b/src/imports/nativestyle/items/qquickstyleitemframe.h
@@ -46,11 +46,11 @@ class QQuickStyleItemFrame : public QQuickStyleItem
     QML_NAMED_ELEMENT(Frame)
 
 protected:
-    void paintEvent(QPainter *painter) override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionFrame &styleOption);
+    void initStyleOption(QStyleOptionFrame &styleOption) const;
 };
 
 #endif // QQUICKSTYLEITEMFRAME_H
diff --git a/src/imports/nativestyle/items/qquickstyleitemgroupbox.cpp b/src/imports/nativestyle/items/qquickstyleitemgroupbox.cpp
index d62b6f23..a828160d 100644
--- a/src/imports/nativestyle/items/qquickstyleitemgroupbox.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemgroupbox.cpp
@@ -36,7 +36,7 @@
 
 #include "qquickstyleitemgroupbox.h"
 
-QFont QQuickStyleItemGroupBox::styleFont(QQuickItem *control)
+QFont QQuickStyleItemGroupBox::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_HeaderLabel, controlSize(control));
 }
@@ -75,14 +75,14 @@ StyleItemGeometry QQuickStyleItemGroupBox::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemGroupBox::paintEvent(QPainter *painter)
+void QQuickStyleItemGroupBox::paintEvent(QPainter *painter) const
 {
     QStyleOptionGroupBox styleOption;
     initStyleOption(styleOption);
     style()->drawComplexControl(QStyle::CC_GroupBox, &styleOption, painter);
 }
 
-void QQuickStyleItemGroupBox::initStyleOption(QStyleOptionGroupBox &styleOption)
+void QQuickStyleItemGroupBox::initStyleOption(QStyleOptionGroupBox &styleOption) const
 {
     initStyleOptionBase(styleOption);
     styleOption.subControls = QStyle::SC_GroupBoxFrame;
diff --git a/src/imports/nativestyle/items/qquickstyleitemgroupbox.h b/src/imports/nativestyle/items/qquickstyleitemgroupbox.h
index efb6d4f6..2b07287f 100644
--- a/src/imports/nativestyle/items/qquickstyleitemgroupbox.h
+++ b/src/imports/nativestyle/items/qquickstyleitemgroupbox.h
@@ -50,21 +50,21 @@ class QQuickStyleItemGroupBox : public QQuickStyleItem
 public:
     QQuickStyleMargins groupBoxPadding() const;
     QPointF labelPos() const;
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 signals:
     void groupBoxPaddingChanged();
     void labelPosChanged();
 
 protected:
-    void paintEvent(QPainter *painter) override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
     QQuickStyleMargins m_groupBoxPadding;
     QPointF m_labelPos;
 
-    void initStyleOption(QStyleOptionGroupBox &styleOption);
+    void initStyleOption(QStyleOptionGroupBox &styleOption) const;
 };
 
 #endif // QQUICKSTYLEITEMGROUPBOX_H
diff --git a/src/imports/nativestyle/items/qquickstyleitemprogressbar.cpp b/src/imports/nativestyle/items/qquickstyleitemprogressbar.cpp
index 707b9c62..480e8981 100644
--- a/src/imports/nativestyle/items/qquickstyleitemprogressbar.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemprogressbar.cpp
@@ -36,12 +36,12 @@
 
 #include "qquickstyleitemprogressbar.h"
 
-QFont QQuickStyleItemProgressBar::styleFont(QQuickItem *control)
+QFont QQuickStyleItemProgressBar::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_ProgressBarLabel, controlSize(control));
 }
 
-void QQuickStyleItemProgressBar::connectToControl()
+void QQuickStyleItemProgressBar::connectToControl() const
 {
     QQuickStyleItem::connectToControl();
     auto progressBar = control<QQuickProgressBar>();
@@ -74,7 +74,7 @@ StyleItemGeometry QQuickStyleItemProgressBar::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemProgressBar::paintEvent(QPainter *painter)
+void QQuickStyleItemProgressBar::paintEvent(QPainter *painter) const
 {
     QStyleOptionProgressBar styleOption;
     initStyleOption(styleOption);
@@ -91,7 +91,7 @@ void QQuickStyleItemProgressBar::paintEvent(QPainter *painter)
 #endif
 }
 
-void QQuickStyleItemProgressBar::initStyleOption(QStyleOptionProgressBar &styleOption)
+void QQuickStyleItemProgressBar::initStyleOption(QStyleOptionProgressBar &styleOption) const
 {
     initStyleOptionBase(styleOption);
     auto progressBar = control<QQuickProgressBar>();
diff --git a/src/imports/nativestyle/items/qquickstyleitemprogressbar.h b/src/imports/nativestyle/items/qquickstyleitemprogressbar.h
index 0a3d58c9..53692dbe 100644
--- a/src/imports/nativestyle/items/qquickstyleitemprogressbar.h
+++ b/src/imports/nativestyle/items/qquickstyleitemprogressbar.h
@@ -47,15 +47,15 @@ class QQuickStyleItemProgressBar : public QQuickStyleItem
     QML_NAMED_ELEMENT(ProgressBar)
 
 public:
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 protected:
-    void connectToControl() override;
-    void paintEvent(QPainter *painter) override;
+    void connectToControl() const override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionProgressBar &styleOption);
+    void initStyleOption(QStyleOptionProgressBar &styleOption) const;
 };
 
 #endif // QQUICKSTYLEITEMPROGRESSBAR_H
diff --git a/src/imports/nativestyle/items/qquickstyleitemradiobutton.cpp b/src/imports/nativestyle/items/qquickstyleitemradiobutton.cpp
index b889474b..655bb0b6 100644
--- a/src/imports/nativestyle/items/qquickstyleitemradiobutton.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemradiobutton.cpp
@@ -36,12 +36,12 @@
 
 #include "qquickstyleitemradiobutton.h"
 
-QFont QQuickStyleItemRadioButton::styleFont(QQuickItem *control)
+QFont QQuickStyleItemRadioButton::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_RadioButtonLabel, controlSize(control));
 }
 
-void QQuickStyleItemRadioButton::connectToControl()
+void QQuickStyleItemRadioButton::connectToControl() const
 {
     QQuickStyleItem::connectToControl();
     auto checkbox = control<QQuickRadioButton>();
@@ -66,14 +66,14 @@ StyleItemGeometry QQuickStyleItemRadioButton::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemRadioButton::paintEvent(QPainter *painter)
+void QQuickStyleItemRadioButton::paintEvent(QPainter *painter) const
 {
     QStyleOptionButton styleOption;
     initStyleOption(styleOption);
     style()->drawControl(QStyle::CE_RadioButton, &styleOption, painter);
 }
 
-void QQuickStyleItemRadioButton::initStyleOption(QStyleOptionButton &styleOption)
+void QQuickStyleItemRadioButton::initStyleOption(QStyleOptionButton &styleOption) const
 {
     initStyleOptionBase(styleOption);
     auto checkbox = control<QQuickRadioButton>();
diff --git a/src/imports/nativestyle/items/qquickstyleitemradiobutton.h b/src/imports/nativestyle/items/qquickstyleitemradiobutton.h
index 5ee9097b..56073d8f 100644
--- a/src/imports/nativestyle/items/qquickstyleitemradiobutton.h
+++ b/src/imports/nativestyle/items/qquickstyleitemradiobutton.h
@@ -46,15 +46,15 @@ class QQuickStyleItemRadioButton : public QQuickStyleItem
     QML_NAMED_ELEMENT(RadioButton)
 
 public:
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 protected:
-    void connectToControl() override;
-    void paintEvent(QPainter *painter) override;
+    void connectToControl() const override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionButton &styleOption);
+    void initStyleOption(QStyleOptionButton &styleOption) const;
 };
 
 #endif // QQUICKSTYLEITEMRADIOBUTTON_H
diff --git a/src/imports/nativestyle/items/qquickstyleitemscrollbar.cpp b/src/imports/nativestyle/items/qquickstyleitemscrollbar.cpp
index 364b9b62..1b94b22d 100644
--- a/src/imports/nativestyle/items/qquickstyleitemscrollbar.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemscrollbar.cpp
@@ -36,12 +36,12 @@
 
 #include "qquickstyleitemscrollbar.h"
 
-QFont QQuickStyleItemScrollBar::styleFont(QQuickItem *control)
+QFont QQuickStyleItemScrollBar::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_ProgressBarLabel, controlSize(control));
 }
 
-void QQuickStyleItemScrollBar::connectToControl()
+void QQuickStyleItemScrollBar::connectToControl() const
 {
     QQuickStyleItem::connectToControl();
     auto scrollBar = control<QQuickScrollBar>();
@@ -64,14 +64,14 @@ StyleItemGeometry QQuickStyleItemScrollBar::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemScrollBar::paintEvent(QPainter *painter)
+void QQuickStyleItemScrollBar::paintEvent(QPainter *painter) const
 {
     QStyleOptionSlider styleOption;
     initStyleOption(styleOption);
     style()->drawComplexControl(QStyle::CC_ScrollBar, &styleOption, painter);
 }
 
-void QQuickStyleItemScrollBar::initStyleOption(QStyleOptionSlider &styleOption)
+void QQuickStyleItemScrollBar::initStyleOption(QStyleOptionSlider &styleOption) const
 {
     initStyleOptionBase(styleOption);
     auto scrollBar = control<QQuickScrollBar>();
diff --git a/src/imports/nativestyle/items/qquickstyleitemscrollbar.h b/src/imports/nativestyle/items/qquickstyleitemscrollbar.h
index e181d4ec..9d86cb09 100644
--- a/src/imports/nativestyle/items/qquickstyleitemscrollbar.h
+++ b/src/imports/nativestyle/items/qquickstyleitemscrollbar.h
@@ -55,15 +55,15 @@ public:
     };
     Q_ENUM(SubControl)
 
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 protected:
-    void connectToControl() override;
-    void paintEvent(QPainter *painter) override;
+    void connectToControl() const override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionSlider &styleOption);
+    void initStyleOption(QStyleOptionSlider &styleOption) const;
 
 private:
    SubControl m_subControl = Groove;
diff --git a/src/imports/nativestyle/items/qquickstyleitemscrollviewcorner.cpp b/src/imports/nativestyle/items/qquickstyleitemscrollviewcorner.cpp
index 0c759d96..3a992f2d 100644
--- a/src/imports/nativestyle/items/qquickstyleitemscrollviewcorner.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemscrollviewcorner.cpp
@@ -56,7 +56,7 @@ StyleItemGeometry QQuickStyleItemScrollViewCorner::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemScrollViewCorner::paintEvent(QPainter *painter)
+void QQuickStyleItemScrollViewCorner::paintEvent(QPainter *painter) const
 {
     QStyleOptionSlider styleOption;
     initStyleOption(styleOption);
@@ -106,7 +106,7 @@ void QQuickStyleItemScrollViewCorner::paintEvent(QPainter *painter)
     painter->restore();
 }
 
-void QQuickStyleItemScrollViewCorner::initStyleOption(QStyleOptionSlider &styleOption)
+void QQuickStyleItemScrollViewCorner::initStyleOption(QStyleOptionSlider &styleOption) const
 {
     initStyleOptionBase(styleOption);
 
diff --git a/src/imports/nativestyle/items/qquickstyleitemscrollviewcorner.h b/src/imports/nativestyle/items/qquickstyleitemscrollviewcorner.h
index 3efc7032..637a8ea8 100644
--- a/src/imports/nativestyle/items/qquickstyleitemscrollviewcorner.h
+++ b/src/imports/nativestyle/items/qquickstyleitemscrollviewcorner.h
@@ -46,11 +46,11 @@ class QQuickStyleItemScrollViewCorner : public QQuickStyleItem
     QML_NAMED_ELEMENT(ScrollViewCorner)
 
 protected:
-    void paintEvent(QPainter *painter) override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionSlider &styleOption);
+    void initStyleOption(QStyleOptionSlider &styleOption) const;
 };
 
 #endif // QQUICKSTYLEITEMSCROLLVIEWCORNER_H
diff --git a/src/imports/nativestyle/items/qquickstyleitemslider.cpp b/src/imports/nativestyle/items/qquickstyleitemslider.cpp
index 0d226c02..67161ad3 100644
--- a/src/imports/nativestyle/items/qquickstyleitemslider.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemslider.cpp
@@ -36,12 +36,12 @@
 
 #include "qquickstyleitemslider.h"
 
-QFont QQuickStyleItemSlider::styleFont(QQuickItem *control)
+QFont QQuickStyleItemSlider::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_ProgressBarLabel, controlSize(control));
 }
 
-void QQuickStyleItemSlider::connectToControl()
+void QQuickStyleItemSlider::connectToControl() const
 {
     QQuickStyleItem::connectToControl();
     auto slider = control<QQuickSlider>();
@@ -70,14 +70,14 @@ StyleItemGeometry QQuickStyleItemSlider::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemSlider::paintEvent(QPainter *painter)
+void QQuickStyleItemSlider::paintEvent(QPainter *painter) const
 {
     QStyleOptionSlider styleOption;
     initStyleOption(styleOption);
     style()->drawComplexControl(QStyle::CC_Slider, &styleOption, painter);
 }
 
-void QQuickStyleItemSlider::initStyleOption(QStyleOptionSlider &styleOption)
+void QQuickStyleItemSlider::initStyleOption(QStyleOptionSlider &styleOption) const
 {
     initStyleOptionBase(styleOption);
     auto slider = control<QQuickSlider>();
diff --git a/src/imports/nativestyle/items/qquickstyleitemslider.h b/src/imports/nativestyle/items/qquickstyleitemslider.h
index 1108930b..9a514207 100644
--- a/src/imports/nativestyle/items/qquickstyleitemslider.h
+++ b/src/imports/nativestyle/items/qquickstyleitemslider.h
@@ -55,15 +55,15 @@ public:
     };
     Q_ENUM(SubControl)
 
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 protected:
-    void connectToControl() override;
-    void paintEvent(QPainter *painter) override;
+    void connectToControl() const override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionSlider &styleOption);
+    void initStyleOption(QStyleOptionSlider &styleOption) const;
 
 private:
    SubControl m_subControl = Groove;
diff --git a/src/imports/nativestyle/items/qquickstyleitemspinbox.cpp b/src/imports/nativestyle/items/qquickstyleitemspinbox.cpp
index 7bae2c8b..46097567 100644
--- a/src/imports/nativestyle/items/qquickstyleitemspinbox.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemspinbox.cpp
@@ -36,12 +36,12 @@
 
 #include "qquickstyleitemspinbox.h"
 
-QFont QQuickStyleItemSpinBox::styleFont(QQuickItem *control)
+QFont QQuickStyleItemSpinBox::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_ComboBoxLabel, controlSize(control));
 }
 
-void QQuickStyleItemSpinBox::connectToControl()
+void QQuickStyleItemSpinBox::connectToControl() const
 {
     QQuickStyleItem::connectToControl();
     auto spinbox = control<QQuickSpinBox>();
@@ -71,14 +71,14 @@ StyleItemGeometry QQuickStyleItemSpinBox::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemSpinBox::paintEvent(QPainter *painter)
+void QQuickStyleItemSpinBox::paintEvent(QPainter *painter) const
 {
     QStyleOptionSpinBox styleOption;
     initStyleOption(styleOption);
     style()->drawComplexControl(QStyle::CC_SpinBox, &styleOption, painter);
 }
 
-void QQuickStyleItemSpinBox::initStyleOption(QStyleOptionSpinBox &styleOption)
+void QQuickStyleItemSpinBox::initStyleOption(QStyleOptionSpinBox &styleOption) const
 {
     initStyleOptionBase(styleOption);
     auto spinbox = control<QQuickSpinBox>();
diff --git a/src/imports/nativestyle/items/qquickstyleitemspinbox.h b/src/imports/nativestyle/items/qquickstyleitemspinbox.h
index 101d4b2a..d4b9f9fa 100644
--- a/src/imports/nativestyle/items/qquickstyleitemspinbox.h
+++ b/src/imports/nativestyle/items/qquickstyleitemspinbox.h
@@ -56,15 +56,15 @@ public:
     };
     Q_ENUM(SubControl)
 
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 protected:
-    void connectToControl() override;
-    void paintEvent(QPainter *painter) override;
+    void connectToControl() const override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionSpinBox &styleOption);
+    void initStyleOption(QStyleOptionSpinBox &styleOption) const;
 
 private:
    SubControl m_subControl = Frame;
diff --git a/src/imports/nativestyle/items/qquickstyleitemtextfield.cpp b/src/imports/nativestyle/items/qquickstyleitemtextfield.cpp
index d4b4a9a1..cd7d35aa 100644
--- a/src/imports/nativestyle/items/qquickstyleitemtextfield.cpp
+++ b/src/imports/nativestyle/items/qquickstyleitemtextfield.cpp
@@ -36,12 +36,12 @@
 
 #include "qquickstyleitemtextfield.h"
 
-QFont QQuickStyleItemTextField::styleFont(QQuickItem *control)
+QFont QQuickStyleItemTextField::styleFont(QQuickItem *control) const
 {
     return style()->font(QStyle::CE_ComboBoxLabel, controlSize(control));
 }
 
-void QQuickStyleItemTextField::connectToControl()
+void QQuickStyleItemTextField::connectToControl() const
 {
     QQuickStyleItem::connectToControl();
     auto textField = control<QQuickTextField>();
@@ -66,14 +66,14 @@ StyleItemGeometry QQuickStyleItemTextField::calculateGeometry()
     return geometry;
 }
 
-void QQuickStyleItemTextField::paintEvent(QPainter *painter)
+void QQuickStyleItemTextField::paintEvent(QPainter *painter) const
 {
     QStyleOptionFrame styleOption;
     initStyleOption(styleOption);
     style()->drawPrimitive(QStyle::PE_PanelLineEdit, &styleOption, painter);
 }
 
-void QQuickStyleItemTextField::initStyleOption(QStyleOptionFrame &styleOption)
+void QQuickStyleItemTextField::initStyleOption(QStyleOptionFrame &styleOption) const
 {
     initStyleOptionBase(styleOption);
     auto textField = control<QQuickTextField>();
diff --git a/src/imports/nativestyle/items/qquickstyleitemtextfield.h b/src/imports/nativestyle/items/qquickstyleitemtextfield.h
index 57aa8885..35aaf753 100644
--- a/src/imports/nativestyle/items/qquickstyleitemtextfield.h
+++ b/src/imports/nativestyle/items/qquickstyleitemtextfield.h
@@ -46,15 +46,15 @@ class QQuickStyleItemTextField : public QQuickStyleItem
     QML_NAMED_ELEMENT(TextField)
 
 public:
-    QFont styleFont(QQuickItem *control) override;
+    QFont styleFont(QQuickItem *control) const override;
 
 protected:
-    void connectToControl() override;
-    void paintEvent(QPainter *painter) override;
+    void connectToControl() const override;
+    void paintEvent(QPainter *painter) const override;
     StyleItemGeometry calculateGeometry() override;
 
 private:
-    void initStyleOption(QStyleOptionFrame &styleOption);
+    void initStyleOption(QStyleOptionFrame &styleOption) const;
 };
 
 #endif // QQUICKSTYLEITEMTEXTFIELD_H