QProxyStyle Class | Qt Widgets 5.12.8

- Qt 5.12
- Qt Widgets
- C++ Classes
- QProxyStyle
- Qt 5.12.8 Reference Documentation

# QProxyStyle Class

The QProxyStyle class is a convenience class that simplifies dynamically overriding QStyle elements. More...

Header: | #include <QProxyStyle>
qmake: | QT += widgets
Since: | Qt 4.6
Inherits: | QCommonStyle

- List of all members, including inherited members
- Obsolete members

## Public Functions

| QProxyStyle(QStyle *style = nullptr)
| QProxyStyle(const QString &key)
virtual | ~QProxyStyle()
QStyle * | baseStyle() const
void | setBaseStyle(QStyle *style)

## Reimplemented Public Functions

virtual void | drawComplexControl(QStyle::ComplexControl control, const QStyleOptionComplex *option, QPainter *painter, const QWidget *widget = nullptr) const override
virtual void | drawControl(QStyle::ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = nullptr) const override
virtual void | drawItemPixmap(QPainter *painter, const QRect &rect, int alignment, const QPixmap &pixmap) const override
virtual void | drawItemText(QPainter *painter, const QRect &rect, int flags, const QPalette &pal, bool enabled, const QString &text, QPalette::ColorRole textRole = QPalette::NoRole) const override
virtual void | drawPrimitive(QStyle::PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = nullptr) const override
virtual QPixmap | generatedIconPixmap(QIcon::Mode iconMode, const QPixmap &pixmap, const QStyleOption *opt) const override
virtual QStyle::SubControl | hitTestComplexControl(QStyle::ComplexControl control, const QStyleOptionComplex *option, const QPoint &pos, const QWidget *widget = nullptr) const override
virtual QRect | itemPixmapRect(const QRect &r, int flags, const QPixmap &pixmap) const override
virtual QRect | itemTextRect(const QFontMetrics &fm, const QRect &r, int flags, bool enabled, const QString &text) const override
virtual int | layoutSpacing(QSizePolicy::ControlType control1, QSizePolicy::ControlType control2, Qt::Orientation orientation, const QStyleOption *option = nullptr, const QWidget *widget = nullptr) const override
virtual int | pixelMetric(QStyle::PixelMetric metric, const QStyleOption *option = nullptr, const QWidget *widget = nullptr) const override
virtual void | polish(QWidget *widget) override
virtual void | polish(QPalette &pal) override
virtual void | polish(QApplication *app) override
virtual QSize | sizeFromContents(QStyle::ContentsType type, const QStyleOption *option, const QSize &size, const QWidget *widget) const override
virtual QIcon | standardIcon(QStyle::StandardPixmap standardIcon, const QStyleOption *option = nullptr, const QWidget *widget = nullptr) const override
virtual QPalette | standardPalette() const override
virtual QPixmap | standardPixmap(QStyle::StandardPixmap standardPixmap, const QStyleOption *opt, const QWidget *widget = nullptr) const override
virtual int | styleHint(QStyle::StyleHint hint, const QStyleOption *option = nullptr, const QWidget *widget = nullptr, QStyleHintReturn *returnData = nullptr) const override
virtual QRect | subControlRect(QStyle::ComplexControl cc, const QStyleOptionComplex *option, QStyle::SubControl sc, const QWidget *widget) const override
virtual QRect | subElementRect(QStyle::SubElement element, const QStyleOption *option, const QWidget *widget) const override
virtual void | unpolish(QWidget *widget) override
virtual void | unpolish(QApplication *app) override

- 17 public functions inherited from QCommonStyle
- 24 public functions inherited from QStyle
- 31 public functions inherited from QObject

## Static Public Members

const QMetaObject | staticMetaObject

- 6 static public members inherited from QStyle
- 9 static public members inherited from QObject

## Reimplemented Protected Functions

virtual bool | event(QEvent *e) override

- 9 protected functions inherited from QObject

### Additional Inherited Members

- 1 property inherited from QObject
- 1 public slot inherited from QObject
- 2 signals inherited from QObject
- 9 protected functions inherited from QObject

## Detailed Description

The QProxyStyle class is a convenience class that simplifies dynamically overriding QStyle elements.

A QProxyStyle wraps a QStyle (usually the default system style) for the purpose of dynamically overriding painting or other specific style behavior.

The following example shows how to override the shortcut underline behavior on any platform:

     #include "textedit.h"
     #include <QApplication>
     #include <QProxyStyle>

     class MyProxyStyle : public QProxyStyle
     {
       public:
         int styleHint(StyleHint hint, const QStyleOption *option = 0,
                       const QWidget *widget = 0, QStyleHintReturn *returnData = 0) const override
         {
             if (hint == QStyle::SH_UnderlineShortcut)
                 return 0;
             return QProxyStyle::styleHint(hint, option, widget, returnData);
         }
     };

     int main(int argc, char **argv)
     {
         Q_INIT_RESOURCE(textedit);

         QApplication a(argc, argv);
         a.setStyle(new MyProxyStyle);
         TextEdit mw;
         mw.resize(700, 800);
         mw.show();
         //...
     }

Warning: The common styles provided by Qt will respect this hint, because they call QStyle::proxy(), but there is no guarantee that QStyle::proxy() will be called for user defined or system controlled styles. It would not work on a Mac, for example, where menus are handled by the operating system.

See also QStyle.

## Member Function Documentation

### QProxyStyle::QProxyStyle(QStyle *style = nullptr)

Constructs a QProxyStyle object for overriding behavior in the specified style, or in the default native style if style is not specified.

Ownership of style is transferred to QProxyStyle.

### QProxyStyle::QProxyStyle(const QString &key)

Constructs a QProxyStyle object for overriding behavior in the base style specified by style key, or in the current application style if the specified style key is unrecognized.

See also QStyleFactory::create().

### `[virtual]` QProxyStyle::~QProxyStyle()

Destroys the QProxyStyle object.

### QStyle *QProxyStyle::baseStyle() const

Returns the proxy base style object. If no base style is set on the proxy style, QProxyStyle will create an instance of the application style instead.

See also setBaseStyle() and QStyle.

### `[override virtual]` void QProxyStyle::drawComplexControl(QStyle::ComplexControl control, const QStyleOptionComplex *option, QPainter *painter, const QWidget *widget = nullptr) const

Reimplemented from QCommonStyle::drawComplexControl().

### `[override virtual]` void QProxyStyle::drawControl(QStyle::ControlElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = nullptr) const

Reimplemented from QCommonStyle::drawControl().

### `[override virtual]` void QProxyStyle::drawItemPixmap(QPainter *painter, const QRect &rect, int alignment, const QPixmap &pixmap) const

Reimplemented from QStyle::drawItemPixmap().

### `[override virtual]` void QProxyStyle::drawItemText(QPainter *painter, const QRect &rect, int flags, const QPalette &pal, bool enabled, const QString &text, QPalette::ColorRole textRole = QPalette::NoRole) const

Reimplemented from QStyle::drawItemText().

### `[override virtual]` void QProxyStyle::drawPrimitive(QStyle::PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = nullptr) const

Reimplemented from QCommonStyle::drawPrimitive().

### `[override virtual protected]` bool QProxyStyle::event(QEvent *e)

Reimplemented from QObject::event().

### `[override virtual]` QPixmap QProxyStyle::generatedIconPixmap(QIcon::Mode iconMode, const QPixmap &pixmap, const QStyleOption *opt) const

Reimplemented from QCommonStyle::generatedIconPixmap().

### `[override virtual]` QStyle::SubControl QProxyStyle::hitTestComplexControl(QStyle::ComplexControl control, const QStyleOptionComplex *option, const QPoint &pos, const QWidget *widget = nullptr) const

Reimplemented from QCommonStyle::hitTestComplexControl().

### `[override virtual]` QRect QProxyStyle::itemPixmapRect(const QRect &r, int flags, const QPixmap &pixmap) const

Reimplemented from QStyle::itemPixmapRect().

### `[override virtual]` QRect QProxyStyle::itemTextRect(const QFontMetrics &fm, const QRect &r, int flags, bool enabled, const QString &text) const

Reimplemented from QStyle::itemTextRect().

### `[override virtual]` int QProxyStyle::layoutSpacing(QSizePolicy::ControlType control1, QSizePolicy::ControlType control2, Qt::Orientation orientation, const QStyleOption *option = nullptr, const QWidget *widget = nullptr) const

Reimplemented from QCommonStyle::layoutSpacing().

This slot is called by layoutSpacing() to determine the spacing that should be used between control1 and control2 in a layout. orientation specifies whether the controls are laid out side by side or stacked vertically. The option parameter can be used to pass extra information about the parent widget. The widget parameter is optional and can also be used if option is 0.

The default implementation returns -1.

See also combinedLayoutSpacing().

### `[override virtual]` int QProxyStyle::pixelMetric(QStyle::PixelMetric metric, const QStyleOption *option = nullptr, const QWidget *widget = nullptr) const

Reimplemented from QCommonStyle::pixelMetric().

### `[override virtual]` void QProxyStyle::polish(QWidget *widget)

Reimplemented from QCommonStyle::polish().

### `[override virtual]` void QProxyStyle::polish(QPalette &pal)

Reimplemented from QCommonStyle::polish().

### `[override virtual]` void QProxyStyle::polish(QApplication *app)

Reimplemented from QCommonStyle::polish().

### void QProxyStyle::setBaseStyle(QStyle *style)

Sets the base style that should be proxied.

Ownership of style is transferred to QProxyStyle.

If style is zero, a desktop-dependant style will be assigned automatically.

See also baseStyle().

### `[override virtual]` QSize QProxyStyle::sizeFromContents(QStyle::ContentsType type, const QStyleOption *option, const QSize &size, const QWidget *widget) const

Reimplemented from QCommonStyle::sizeFromContents().

### `[override virtual]` QIcon QProxyStyle::standardIcon(QStyle::StandardPixmap standardIcon, const QStyleOption *option = nullptr, const QWidget *widget = nullptr) const

Returns an icon for the given standardIcon.

Reimplement this slot to provide your own icons in a QStyle subclass. The option argument can be used to pass extra information required to find the appropriate icon. The widget argument is optional and can also be used to help find the icon.

### `[override virtual]` QPalette QProxyStyle::standardPalette() const

Reimplemented from QStyle::standardPalette().

### `[override virtual]` QPixmap QProxyStyle::standardPixmap(QStyle::StandardPixmap standardPixmap, const QStyleOption *opt, const QWidget *widget = nullptr) const

Reimplemented from QCommonStyle::standardPixmap().

### `[override virtual]` int QProxyStyle::styleHint(QStyle::StyleHint hint, const QStyleOption *option = nullptr, const QWidget *widget = nullptr, QStyleHintReturn *returnData = nullptr) const

Reimplemented from QCommonStyle::styleHint().

### `[override virtual]` QRect QProxyStyle::subControlRect(QStyle::ComplexControl cc, const QStyleOptionComplex *option, QStyle::SubControl sc, const QWidget *widget) const

Reimplemented from QCommonStyle::subControlRect().

### `[override virtual]` QRect QProxyStyle::subElementRect(QStyle::SubElement element, const QStyleOption *option, const QWidget *widget) const

Reimplemented from QCommonStyle::subElementRect().

### `[override virtual]` void QProxyStyle::unpolish(QWidget *widget)

Reimplemented from QCommonStyle::unpolish().

### `[override virtual]` void QProxyStyle::unpolish(QApplication *app)

Reimplemented from QCommonStyle::unpolish().