Struct qt_gui::QScreen

#[repr(C)]
pub struct QScreen { /* private fields */ }

The QScreen class is used to query screen properties.

C++ class: QScreen.

C++ documentation:

The QScreen class is used to query screen properties.

A note on logical vs physical dots per inch: physical DPI is based on the actual physical pixel sizes when available, and is useful for print preview and other cases where it's desirable to know the exact physical dimensions of screen displayed contents.

Logical dots per inch are used to convert font and user interface elements from point sizes to pixel sizes, and might be different from the physical dots per inch. The logical dots per inch are sometimes user-settable in the desktop environment's settings panel, to let the user globally control UI and font sizes in different applications.

Implementations

impl QScreen

pub fn geometry_changed(&self) -> Signal<(*const QRect,)>

Returns a built-in Qt signal QScreen::geometryChanged that can be passed to qt_core::Signal::connect.

pub fn available_geometry_changed(&self) -> Signal<(*const QRect,)>

Returns a built-in Qt signal QScreen::availableGeometryChanged that can be passed to qt_core::Signal::connect.

pub fn physical_size_changed(&self) -> Signal<(*const QSizeF,)>

This property holds the screen's physical size (in millimeters)

Returns a built-in Qt signal QScreen::physicalSizeChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This property holds the screen’s physical size (in millimeters)

The physical size represents the actual physical dimensions of the screen's display.

Depending on what information the underlying system provides the value might not be entirely accurate.

Access functions:

QSizeF

physicalSize() const

Notifier signal:

void	physicalSizeChanged(const QSizeF &size)

pub fn physical_dots_per_inch_changed(&self) -> Signal<(c_double,)>

Returns a built-in Qt signal QScreen::physicalDotsPerInchChanged that can be passed to qt_core::Signal::connect.

pub fn logical_dots_per_inch_changed(&self) -> Signal<(c_double,)>

Returns a built-in Qt signal QScreen::logicalDotsPerInchChanged that can be passed to qt_core::Signal::connect.

pub fn virtual_geometry_changed(&self) -> Signal<(*const QRect,)>

Returns a built-in Qt signal QScreen::virtualGeometryChanged that can be passed to qt_core::Signal::connect.

pub fn primary_orientation_changed(&self) -> Signal<(ScreenOrientation,)>

This signal is emitted when the primary orientation of the screen changes with orientation as an argument.

Returns a built-in Qt signal QScreen::primaryOrientationChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the primary orientation of the screen changes with orientation as an argument.

Note: Notifier signal for property primaryOrientation.

See also primaryOrientation().

pub fn orientation_changed(&self) -> Signal<(ScreenOrientation,)>

This signal is emitted when the orientation of the screen changes with orientation as an argument.

Returns a built-in Qt signal QScreen::orientationChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted when the orientation of the screen changes with orientation as an argument.

Note: Notifier signal for property orientation.

See also orientation().

pub fn refresh_rate_changed(&self) -> Signal<(c_double,)>

This property holds the approximate vertical refresh rate of the screen in Hz

Returns a built-in Qt signal QScreen::refreshRateChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This property holds the approximate vertical refresh rate of the screen in Hz

Access functions:

qreal

refreshRate() const

Notifier signal:

void	refreshRateChanged(qreal refreshRate)

pub unsafe fn angle_between( &self, a: ScreenOrientation, b: ScreenOrientation ) -> c_int

Convenience function to compute the angle of rotation to get from rotation a to rotation b.

Calls C++ function: int QScreen::angleBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b) const.

C++ documentation:

Convenience function to compute the angle of rotation to get from rotation a to rotation b.

The result will be 0, 90, 180, or 270.

Qt::PrimaryOrientation is interpreted as the screen's primaryOrientation().

pub unsafe fn available_geometry(&self) -> CppBox<QRect>

This property holds the screen's available geometry in pixels

Calls C++ function: QRect QScreen::availableGeometry() const.

C++ documentation:

This property holds the screen’s available geometry in pixels

The available geometry is the geometry excluding window manager reserved areas such as task bars and system menus.

Access functions:

QRect

availableGeometry() const

Notifier signal:

void	availableGeometryChanged(const QRect &geometry)

pub unsafe fn available_size(&self) -> CppBox<QSize>

This property holds the screen's available size in pixels

Calls C++ function: QSize QScreen::availableSize() const.

C++ documentation:

This property holds the screen’s available size in pixels

The available size is the size excluding window manager reserved areas such as task bars and system menus.

Access functions:

QSize

availableSize() const

Notifier signal:

void	availableGeometryChanged(const QRect &geometry)

pub unsafe fn available_virtual_geometry(&self) -> CppBox<QRect>

This property holds the available geometry of the virtual desktop to which this screen belongs

Calls C++ function: QRect QScreen::availableVirtualGeometry() const.

C++ documentation:

This property holds the available geometry of the virtual desktop to which this screen belongs

Returns the available geometry of the virtual desktop corresponding to this screen.

This is the union of the virtual siblings' individual available geometries.

Access functions:

QRect

availableVirtualGeometry() const

Notifier signal:

void	virtualGeometryChanged(const QRect &rect)

See also availableGeometry() and virtualSiblings().

pub unsafe fn available_virtual_size(&self) -> CppBox<QSize>

This property holds the available size of the virtual desktop to which this screen belongs

Calls C++ function: QSize QScreen::availableVirtualSize() const.

C++ documentation:

This property holds the available size of the virtual desktop to which this screen belongs

Returns the available pixel size of the virtual desktop corresponding to this screen.

This is the combined size of the virtual siblings' individual available geometries.

Access functions:

QSize

availableVirtualSize() const

Notifier signal:

void	virtualGeometryChanged(const QRect &rect)

See also availableSize() and virtualSiblings().

pub unsafe fn depth(&self) -> c_int

This property holds the color depth of the screen

Calls C++ function: int QScreen::depth() const.

C++ documentation:

This property holds the color depth of the screen

Access functions:

int	depth() const

pub unsafe fn device_pixel_ratio(&self) -> c_double

This property holds the screen's ratio between physical pixels and device-independent pixels

Calls C++ function: double QScreen::devicePixelRatio() const.

C++ documentation:

This property holds the screen’s ratio between physical pixels and device-independent pixels

Returns the ratio between physical pixels and device-independent pixels for the screen.

Common values are 1.0 on normal displays and 2.0 on "retina" displays. Higher values are also possible.

This property was introduced in Qt 5.5.

Access functions:

qreal

devicePixelRatio() const

Notifier signal:

void	physicalDotsPerInchChanged(qreal dpi)

See also QWindow::devicePixelRatio() and QGuiApplication::devicePixelRatio().

pub unsafe fn geometry(&self) -> CppBox<QRect>

This property holds the screen's geometry in pixels

Calls C++ function: QRect QScreen::geometry() const.

C++ documentation:

This property holds the screen’s geometry in pixels

As an example this might return QRect(0, 0, 1280, 1024), or in a virtual desktop setting QRect(1280, 0, 1280, 1024).

Access functions:

QRect

geometry() const

Notifier signal:

void	geometryChanged(const QRect &geometry)

pub unsafe fn grab_window_5a( &self, window: c_ulonglong, x: c_int, y: c_int, w: c_int, h: c_int ) -> CppBox<QPixmap>

Creates and returns a pixmap constructed by grabbing the contents of the given window restricted by QRect(x, y, width, height).

Calls C++ function: QPixmap QScreen::grabWindow(unsigned long long window, int x = …, int y = …, int w = …, int h = …).

C++ documentation:

Creates and returns a pixmap constructed by grabbing the contents of the given window restricted by QRect(x, y, width, height).

The arguments (x, y) specify the offset in the window, whereas (width, height) specify the area to be copied. If width is negative, the function copies everything to the right border of the window. If height is negative, the function copies everything to the bottom of the window.

The window system identifier (WId) can be retrieved using the QWidget::winId() function. The rationale for using a window identifier and not a QWidget, is to enable grabbing of windows that are not part of the application, window system frames, and so on.

Warning: Grabbing windows that are not part of the application is not supported on systems such as iOS, where sandboxing/security prevents reading pixels of windows not owned by the application.

The grabWindow() function grabs pixels from the screen, not from the window, i.e. if there is another window partially or entirely over the one you grab, you get pixels from the overlying window, too. The mouse cursor is generally not grabbed.

Note on X11 that if the given window doesn't have the same depth as the root window, and another window partially or entirely obscures the one you grab, you will not get pixels from the overlying window. The contents of the obscured areas in the pixmap will be undefined and uninitialized.

On Windows Vista and above grabbing a layered window, which is created by setting the Qt::WA_TranslucentBackground attribute, will not work. Instead grabbing the desktop widget should work.

Warning: In general, grabbing an area outside the screen is not safe. This depends on the underlying window system.

pub unsafe fn grab_window_4a( &self, window: c_ulonglong, x: c_int, y: c_int, w: c_int ) -> CppBox<QPixmap>

Creates and returns a pixmap constructed by grabbing the contents of the given window restricted by QRect(x, y, width, height).

Calls C++ function: QPixmap QScreen::grabWindow(unsigned long long window, int x = …, int y = …, int w = …).

C++ documentation:

Creates and returns a pixmap constructed by grabbing the contents of the given window restricted by QRect(x, y, width, height).

The arguments (x, y) specify the offset in the window, whereas (width, height) specify the area to be copied. If width is negative, the function copies everything to the right border of the window. If height is negative, the function copies everything to the bottom of the window.

The window system identifier (WId) can be retrieved using the QWidget::winId() function. The rationale for using a window identifier and not a QWidget, is to enable grabbing of windows that are not part of the application, window system frames, and so on.

Warning: Grabbing windows that are not part of the application is not supported on systems such as iOS, where sandboxing/security prevents reading pixels of windows not owned by the application.

The grabWindow() function grabs pixels from the screen, not from the window, i.e. if there is another window partially or entirely over the one you grab, you get pixels from the overlying window, too. The mouse cursor is generally not grabbed.

Note on X11 that if the given window doesn't have the same depth as the root window, and another window partially or entirely obscures the one you grab, you will not get pixels from the overlying window. The contents of the obscured areas in the pixmap will be undefined and uninitialized.

On Windows Vista and above grabbing a layered window, which is created by setting the Qt::WA_TranslucentBackground attribute, will not work. Instead grabbing the desktop widget should work.

Warning: In general, grabbing an area outside the screen is not safe. This depends on the underlying window system.

pub unsafe fn grab_window_3a( &self, window: c_ulonglong, x: c_int, y: c_int ) -> CppBox<QPixmap>

Creates and returns a pixmap constructed by grabbing the contents of the given window restricted by QRect(x, y, width, height).

Calls C++ function: QPixmap QScreen::grabWindow(unsigned long long window, int x = …, int y = …).

C++ documentation:

Creates and returns a pixmap constructed by grabbing the contents of the given window restricted by QRect(x, y, width, height).

The arguments (x, y) specify the offset in the window, whereas (width, height) specify the area to be copied. If width is negative, the function copies everything to the right border of the window. If height is negative, the function copies everything to the bottom of the window.

The window system identifier (WId) can be retrieved using the QWidget::winId() function. The rationale for using a window identifier and not a QWidget, is to enable grabbing of windows that are not part of the application, window system frames, and so on.

Warning: Grabbing windows that are not part of the application is not supported on systems such as iOS, where sandboxing/security prevents reading pixels of windows not owned by the application.

The grabWindow() function grabs pixels from the screen, not from the window, i.e. if there is another window partially or entirely over the one you grab, you get pixels from the overlying window, too. The mouse cursor is generally not grabbed.

Note on X11 that if the given window doesn't have the same depth as the root window, and another window partially or entirely obscures the one you grab, you will not get pixels from the overlying window. The contents of the obscured areas in the pixmap will be undefined and uninitialized.

On Windows Vista and above grabbing a layered window, which is created by setting the Qt::WA_TranslucentBackground attribute, will not work. Instead grabbing the desktop widget should work.

Warning: In general, grabbing an area outside the screen is not safe. This depends on the underlying window system.

pub unsafe fn grab_window_2a( &self, window: c_ulonglong, x: c_int ) -> CppBox<QPixmap>

Creates and returns a pixmap constructed by grabbing the contents of the given window restricted by QRect(x, y, width, height).

Calls C++ function: QPixmap QScreen::grabWindow(unsigned long long window, int x = …).

C++ documentation:

Creates and returns a pixmap constructed by grabbing the contents of the given window restricted by QRect(x, y, width, height).

The arguments (x, y) specify the offset in the window, whereas (width, height) specify the area to be copied. If width is negative, the function copies everything to the right border of the window. If height is negative, the function copies everything to the bottom of the window.

The window system identifier (WId) can be retrieved using the QWidget::winId() function. The rationale for using a window identifier and not a QWidget, is to enable grabbing of windows that are not part of the application, window system frames, and so on.

Warning: Grabbing windows that are not part of the application is not supported on systems such as iOS, where sandboxing/security prevents reading pixels of windows not owned by the application.

The grabWindow() function grabs pixels from the screen, not from the window, i.e. if there is another window partially or entirely over the one you grab, you get pixels from the overlying window, too. The mouse cursor is generally not grabbed.

Note on X11 that if the given window doesn't have the same depth as the root window, and another window partially or entirely obscures the one you grab, you will not get pixels from the overlying window. The contents of the obscured areas in the pixmap will be undefined and uninitialized.

On Windows Vista and above grabbing a layered window, which is created by setting the Qt::WA_TranslucentBackground attribute, will not work. Instead grabbing the desktop widget should work.

Warning: In general, grabbing an area outside the screen is not safe. This depends on the underlying window system.

pub unsafe fn grab_window_1a(&self, window: c_ulonglong) -> CppBox<QPixmap>

Creates and returns a pixmap constructed by grabbing the contents of the given window restricted by QRect(x, y, width, height).

Calls C++ function: QPixmap QScreen::grabWindow(unsigned long long window).

C++ documentation:

Creates and returns a pixmap constructed by grabbing the contents of the given window restricted by QRect(x, y, width, height).

The arguments (x, y) specify the offset in the window, whereas (width, height) specify the area to be copied. If width is negative, the function copies everything to the right border of the window. If height is negative, the function copies everything to the bottom of the window.

The window system identifier (WId) can be retrieved using the QWidget::winId() function. The rationale for using a window identifier and not a QWidget, is to enable grabbing of windows that are not part of the application, window system frames, and so on.

Warning: Grabbing windows that are not part of the application is not supported on systems such as iOS, where sandboxing/security prevents reading pixels of windows not owned by the application.

The grabWindow() function grabs pixels from the screen, not from the window, i.e. if there is another window partially or entirely over the one you grab, you get pixels from the overlying window, too. The mouse cursor is generally not grabbed.

Note on X11 that if the given window doesn't have the same depth as the root window, and another window partially or entirely obscures the one you grab, you will not get pixels from the overlying window. The contents of the obscured areas in the pixmap will be undefined and uninitialized.

On Windows Vista and above grabbing a layered window, which is created by setting the Qt::WA_TranslucentBackground attribute, will not work. Instead grabbing the desktop widget should work.

Warning: In general, grabbing an area outside the screen is not safe. This depends on the underlying window system.

pub unsafe fn is_landscape(&self, orientation: ScreenOrientation) -> bool

Convenience function that returns true if o is either landscape or inverted landscape; otherwise returns false.

Calls C++ function: bool QScreen::isLandscape(Qt::ScreenOrientation orientation) const.

C++ documentation:

Convenience function that returns true if o is either landscape or inverted landscape; otherwise returns false.

Qt::PrimaryOrientation is interpreted as the screen's primaryOrientation().

pub unsafe fn is_portrait(&self, orientation: ScreenOrientation) -> bool

Convenience function that returns true if o is either portrait or inverted portrait; otherwise returns false.

Calls C++ function: bool QScreen::isPortrait(Qt::ScreenOrientation orientation) const.

C++ documentation:

Convenience function that returns true if o is either portrait or inverted portrait; otherwise returns false.

Qt::PrimaryOrientation is interpreted as the screen's primaryOrientation().

pub unsafe fn logical_dots_per_inch(&self) -> c_double

This property holds the number of logical dots or pixels per inch

Calls C++ function: double QScreen::logicalDotsPerInch() const.

C++ documentation:

This property holds the number of logical dots or pixels per inch

This value can be used to convert font point sizes to pixel sizes.

This is a convenience property that's simply the average of the logicalDotsPerInchX and logicalDotsPerInchY properties.

Access functions:

qreal

logicalDotsPerInch() const

Notifier signal:

void	logicalDotsPerInchChanged(qreal dpi)

See also logicalDotsPerInchX() and logicalDotsPerInchY().

pub unsafe fn logical_dots_per_inch_x(&self) -> c_double

This property holds the number of logical dots or pixels per inch in the horizontal direction

Calls C++ function: double QScreen::logicalDotsPerInchX() const.

C++ documentation:

This property holds the number of logical dots or pixels per inch in the horizontal direction

This value is used to convert font point sizes to pixel sizes.

Access functions:

qreal

logicalDotsPerInchX() const

Notifier signal:

void	logicalDotsPerInchChanged(qreal dpi)

See also logicalDotsPerInchY().

pub unsafe fn logical_dots_per_inch_y(&self) -> c_double

This property holds the number of logical dots or pixels per inch in the vertical direction

Calls C++ function: double QScreen::logicalDotsPerInchY() const.

C++ documentation:

This property holds the number of logical dots or pixels per inch in the vertical direction

This value is used to convert font point sizes to pixel sizes.

Access functions:

qreal

logicalDotsPerInchY() const

Notifier signal:

void	logicalDotsPerInchChanged(qreal dpi)

See also logicalDotsPerInchX().

pub unsafe fn manufacturer(&self) -> CppBox<QString>

This property holds the manufacturer of the screen

Calls C++ function: QString QScreen::manufacturer() const.

C++ documentation:

This property holds the manufacturer of the screen

This property was introduced in Qt 5.9.

Access functions:

QString

manufacturer() const

pub unsafe fn map_between( &self, a: ScreenOrientation, b: ScreenOrientation, rect: impl CastInto<Ref<QRect>> ) -> CppBox<QRect>

Maps the rect between two screen orientations.

Calls C++ function: QRect QScreen::mapBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b, const QRect& rect) const.

C++ documentation:

Maps the rect between two screen orientations.

This will flip the x and y dimensions of the rectangle rect if the orientation a is Qt::PortraitOrientation or Qt::InvertedPortraitOrientation and orientation b is Qt::LandscapeOrientation or Qt::InvertedLandscapeOrientation, or vice versa.

Qt::PrimaryOrientation is interpreted as the screen's primaryOrientation().

pub unsafe fn meta_object(&self) -> Ptr<QMetaObject>

Calls C++ function: virtual const QMetaObject* QScreen::metaObject() const.

pub unsafe fn model(&self) -> CppBox<QString>

This property holds the model of the screen

Calls C++ function: QString QScreen::model() const.

C++ documentation:

This property holds the model of the screen

This property was introduced in Qt 5.9.

Access functions:

QString

model() const

pub unsafe fn name(&self) -> CppBox<QString>

This property holds a user presentable string representing the screen

Calls C++ function: QString QScreen::name() const.

C++ documentation:

This property holds a user presentable string representing the screen

For example, on X11 these correspond to the XRandr screen names, typically "VGA1", "HDMI1", etc.

Access functions:

QString

name() const

pub unsafe fn native_orientation(&self) -> ScreenOrientation

This property holds the native screen orientation

Calls C++ function: Qt::ScreenOrientation QScreen::nativeOrientation() const.

C++ documentation:

This property holds the native screen orientation

The native orientation of the screen is the orientation where the logo sticker of the device appears the right way up, or Qt::PrimaryOrientation if the platform does not support this functionality.

The native orientation is a property of the hardware, and does not change.

This property was introduced in Qt 5.2.

Access functions:

Qt::ScreenOrientation

nativeOrientation() const

pub unsafe fn orientation(&self) -> ScreenOrientation

This property holds the screen orientation

Calls C++ function: Qt::ScreenOrientation QScreen::orientation() const.

C++ documentation:

This property holds the screen orientation

The screen orientation represents the physical orientation of the display. For example, the screen orientation of a mobile device will change based on how it is being held. A change to the orientation might or might not trigger a change to the primary orientation of the screen.

Changes to this property will be filtered by orientationUpdateMask(), so in order to receive orientation updates the application must first call setOrientationUpdateMask() with a mask of the orientations it wants to receive.

Qt::PrimaryOrientation is never returned.

Access functions:

Qt::ScreenOrientation

orientation() const

Notifier signal:

void	orientationChanged(Qt::ScreenOrientation orientation)

See also primaryOrientation().

pub unsafe fn orientation_update_mask(&self) -> QFlags<ScreenOrientation>

Returns the currently set orientation update mask.

Calls C++ function: QFlags<Qt::ScreenOrientation> QScreen::orientationUpdateMask() const.

C++ documentation:

Returns the currently set orientation update mask.

See also setOrientationUpdateMask().

pub unsafe fn physical_dots_per_inch(&self) -> c_double

This property holds the number of physical dots or pixels per inch

Calls C++ function: double QScreen::physicalDotsPerInch() const.

C++ documentation:

This property holds the number of physical dots or pixels per inch

This value represents the pixel density on the screen's display. Depending on what information the underlying system provides the value might not be entirely accurate.

This is a convenience property that's simply the average of the physicalDotsPerInchX and physicalDotsPerInchY properties.

Access functions:

qreal

physicalDotsPerInch() const

Notifier signal:

void	physicalDotsPerInchChanged(qreal dpi)

See also physicalDotsPerInchX() and physicalDotsPerInchY().

pub unsafe fn physical_dots_per_inch_x(&self) -> c_double

This property holds the number of physical dots or pixels per inch in the horizontal direction

Calls C++ function: double QScreen::physicalDotsPerInchX() const.

C++ documentation:

This property holds the number of physical dots or pixels per inch in the horizontal direction

This value represents the actual horizontal pixel density on the screen's display. Depending on what information the underlying system provides the value might not be entirely accurate.

Access functions:

qreal

physicalDotsPerInchX() const

Notifier signal:

void	physicalDotsPerInchChanged(qreal dpi)

See also physicalDotsPerInchY().

pub unsafe fn physical_dots_per_inch_y(&self) -> c_double

This property holds the number of physical dots or pixels per inch in the vertical direction

Calls C++ function: double QScreen::physicalDotsPerInchY() const.

C++ documentation:

This property holds the number of physical dots or pixels per inch in the vertical direction

This value represents the actual vertical pixel density on the screen's display. Depending on what information the underlying system provides the value might not be entirely accurate.

Access functions:

qreal

physicalDotsPerInchY() const

Notifier signal:

void	physicalDotsPerInchChanged(qreal dpi)

See also physicalDotsPerInchX().

pub unsafe fn physical_size(&self) -> CppBox<QSizeF>

This property holds the screen's physical size (in millimeters)

Calls C++ function: QSizeF QScreen::physicalSize() const.

C++ documentation:

This property holds the screen’s physical size (in millimeters)

The physical size represents the actual physical dimensions of the screen's display.

Depending on what information the underlying system provides the value might not be entirely accurate.

Access functions:

QSizeF

physicalSize() const

Notifier signal:

void	physicalSizeChanged(const QSizeF &size)

pub unsafe fn primary_orientation(&self) -> ScreenOrientation

This property holds the primary screen orientation

Calls C++ function: Qt::ScreenOrientation QScreen::primaryOrientation() const.

C++ documentation:

This property holds the primary screen orientation

The primary screen orientation is Qt::LandscapeOrientation if the screen geometry's width is greater than or equal to its height, or Qt::PortraitOrientation otherwise. This property might change when the screen orientation was changed (i.e. when the display is rotated). The behavior is however platform dependent and can often be specified in an application manifest file.

Access functions:

Qt::ScreenOrientation

primaryOrientation() const

Notifier signal:

void	primaryOrientationChanged(Qt::ScreenOrientation orientation)

pub unsafe fn qt_metacall( &self, arg1: Call, arg2: c_int, arg3: *mut *mut c_void ) -> c_int

Calls C++ function: virtual int QScreen::qt_metacall(QMetaObject::Call arg1, int arg2, void** arg3).

pub unsafe fn qt_metacast(&self, arg1: *const c_char) -> *mut c_void

Calls C++ function: virtual void* QScreen::qt_metacast(const char* arg1).

pub unsafe fn refresh_rate(&self) -> c_double

This property holds the approximate vertical refresh rate of the screen in Hz

Calls C++ function: double QScreen::refreshRate() const.

C++ documentation:

This property holds the approximate vertical refresh rate of the screen in Hz

Access functions:

qreal

refreshRate() const

Notifier signal:

void	refreshRateChanged(qreal refreshRate)

pub unsafe fn serial_number(&self) -> CppBox<QString>

This property holds the serial number of the screen

Calls C++ function: QString QScreen::serialNumber() const.

C++ documentation:

This property holds the serial number of the screen

This property was introduced in Qt 5.9.

Access functions:

QString

serialNumber() const

pub unsafe fn set_orientation_update_mask( &self, mask: QFlags<ScreenOrientation> )

Sets the orientations that the application is interested in receiving updates for in conjunction with this screen.

Calls C++ function: void QScreen::setOrientationUpdateMask(QFlags<Qt::ScreenOrientation> mask).

C++ documentation:

Sets the orientations that the application is interested in receiving updates for in conjunction with this screen.

For example, to receive orientation() updates and thus have orientationChanged() signals being emitted for LandscapeOrientation and InvertedLandscapeOrientation, call setOrientationUpdateMask() with mask set to Qt::LandscapeOrientation | Qt::InvertedLandscapeOrientation.

The default, 0, means no orientationChanged() signals are fired.

See also orientationUpdateMask().

pub unsafe fn size(&self) -> CppBox<QSize>

This property holds the pixel resolution of the screen

Calls C++ function: QSize QScreen::size() const.

C++ documentation:

This property holds the pixel resolution of the screen

Access functions:

QSize

size() const

Notifier signal:

void	geometryChanged(const QRect &geometry)

pub unsafe fn static_meta_object() -> Ref<QMetaObject>

Returns a reference to the staticMetaObject field.

pub unsafe fn tr( s: *const c_char, c: *const c_char, n: c_int ) -> CppBox<QString>

Calls C++ function: static QString QScreen::tr(const char* s, const char* c, int n).

pub unsafe fn tr_utf8( s: *const c_char, c: *const c_char, n: c_int ) -> CppBox<QString>

Calls C++ function: static QString QScreen::trUtf8(const char* s, const char* c, int n).

pub unsafe fn transform_between( &self, a: ScreenOrientation, b: ScreenOrientation, target: impl CastInto<Ref<QRect>> ) -> CppBox<QTransform>

Convenience function to compute a transform that maps from the coordinate system defined by orientation a into the coordinate system defined by orientation b and target dimensions target.

Calls C++ function: QTransform QScreen::transformBetween(Qt::ScreenOrientation a, Qt::ScreenOrientation b, const QRect& target) const.

C++ documentation:

Convenience function to compute a transform that maps from the coordinate system defined by orientation a into the coordinate system defined by orientation b and target dimensions target.

Example, a is Qt::Landscape, b is Qt::Portrait, and target is QRect(0, 0, w, h) the resulting transform will be such that the point QPoint(0, 0) is mapped to QPoint(0, w), and QPoint(h, w) is mapped to QPoint(0, h). Thus, the landscape coordinate system QRect(0, 0, h, w) is mapped (with a 90 degree rotation) into the portrait coordinate system QRect(0, 0, w, h).

Qt::PrimaryOrientation is interpreted as the screen's primaryOrientation().

pub unsafe fn virtual_geometry(&self) -> CppBox<QRect>

This property holds the pixel geometry of the virtual desktop to which this screen belongs

Calls C++ function: QRect QScreen::virtualGeometry() const.

C++ documentation:

This property holds the pixel geometry of the virtual desktop to which this screen belongs

Returns the pixel geometry of the virtual desktop corresponding to this screen.

This is the union of the virtual siblings' individual geometries.

Access functions:

QRect

virtualGeometry() const

Notifier signal:

void	virtualGeometryChanged(const QRect &rect)

See also virtualSiblings().

pub unsafe fn virtual_siblings(&self) -> CppBox<QListOfQScreen>

Get the screen's virtual siblings.

Calls C++ function: QList<QScreen*> QScreen::virtualSiblings() const.

C++ documentation:

Get the screen’s virtual siblings.

The virtual siblings are the screen instances sharing the same virtual desktop. They share a common coordinate system, and windows can freely be moved or positioned across them without having to be re-created.

pub unsafe fn virtual_size(&self) -> CppBox<QSize>

This property holds the pixel size of the virtual desktop to which this screen belongs

Calls C++ function: QSize QScreen::virtualSize() const.

C++ documentation:

This property holds the pixel size of the virtual desktop to which this screen belongs

Returns the pixel size of the virtual desktop corresponding to this screen.

This is the combined size of the virtual siblings' individual geometries.

Access functions:

QSize

virtualSize() const

Notifier signal:

void	virtualGeometryChanged(const QRect &rect)

See also virtualSiblings().

Methods from Deref<Target = QObject>

pub unsafe fn find_child<T>( &self, name: &str ) -> Result<QPtr<T>, FindChildError>

where QObject: DynamicCast<T>, T: StaticUpcast<QObject>,

Finds a child of self with the specified object name and casts it to type T.

The search is performed recursively. If there is more than one child matching the search, the most direct ancestor is returned. If there are several direct ancestors, it is undefined which one will be returned.

Returns an error if there is no child object with object name name or the found object cannot be cast to T.

pub fn destroyed(&self) -> Signal<(*mut QObject,)>

This signal is emitted immediately before the object obj is destroyed, and can not be blocked.

Returns a built-in Qt signal QObject::destroyed that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted immediately before the object obj is destroyed, and can not be blocked.

All the objects's children are destroyed immediately after this signal is emitted.

See also deleteLater() and QPointer.

pub fn object_name_changed(&self) -> Signal<(*const QString,)>

This signal is emitted after the object's name has been changed. The new object name is passed as objectName.

Returns a built-in Qt signal QObject::objectNameChanged that can be passed to qt_core::Signal::connect.

C++ documentation:

This signal is emitted after the object’s name has been changed. The new object name is passed as objectName.

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

Note: Notifier signal for property objectName.

See also QObject::objectName.

pub fn slot_delete_later(&self) -> Receiver<()>

Schedules this object for deletion.

Returns a built-in Qt slot QObject::deleteLater that can be passed to qt_core::Signal::connect.

C++ documentation:

Schedules this object for deletion.

The object will be deleted when control returns to the event loop. If the event loop is not running when this function is called (e.g. deleteLater() is called on an object before QCoreApplication::exec()), the object will be deleted once the event loop is started. If deleteLater() is called after the main event loop has stopped, the object will not be deleted. Since Qt 4.8, if deleteLater() is called on an object that lives in a thread with no running event loop, the object will be destroyed when the thread finishes.

Note that entering and leaving a new event loop (e.g., by opening a modal dialog) will not perform the deferred deletion; for the object to be deleted, the control must return to the event loop from which deleteLater() was called.

Note: It is safe to call this function more than once; when the first deferred deletion event is delivered, any pending events for the object are removed from the event queue.

See also destroyed() and QPointer.

pub unsafe fn block_signals(&self, b: bool) -> bool

If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). If block is false, no such blocking will occur.

Calls C++ function: bool QObject::blockSignals(bool b).

C++ documentation:

If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). If block is false, no such blocking will occur.

The return value is the previous value of signalsBlocked().

Note that the destroyed() signal will be emitted even if the signals for this object have been blocked.

Signals emitted while being blocked are not buffered.

See also signalsBlocked() and QSignalBlocker.

pub unsafe fn children(&self) -> Ref<QListOfQObject>

Returns a list of child objects. The QObjectList class is defined in the <QObject> header file as the following:

Calls C++ function: const QList<QObject*>& QObject::children() const.

C++ documentation:

Returns a list of child objects. The QObjectList class is defined in the <QObject> header file as the following:

  typedef QList<QObject*> QObjectList;

The first child added is the first object in the list and the last child added is the last object in the list, i.e. new children are appended at the end.

Note that the list order changes when QWidget children are raised or lowered. A widget that is raised becomes the last object in the list, and a widget that is lowered becomes the first object in the list.

See also findChild(), findChildren(), parent(), and setParent().

pub unsafe fn delete_later(&self)

Schedules this object for deletion.

Calls C++ function: [slot] void QObject::deleteLater().

C++ documentation:

Schedules this object for deletion.

The object will be deleted when control returns to the event loop. If the event loop is not running when this function is called (e.g. deleteLater() is called on an object before QCoreApplication::exec()), the object will be deleted once the event loop is started. If deleteLater() is called after the main event loop has stopped, the object will not be deleted. Since Qt 4.8, if deleteLater() is called on an object that lives in a thread with no running event loop, the object will be destroyed when the thread finishes.

Note that entering and leaving a new event loop (e.g., by opening a modal dialog) will not perform the deferred deletion; for the object to be deleted, the control must return to the event loop from which deleteLater() was called.

Note: It is safe to call this function more than once; when the first deferred deletion event is delivered, any pending events for the object are removed from the event queue.

See also destroyed() and QPointer.

pub unsafe fn disconnect_char_q_object_char( &self, signal: *const i8, receiver: impl CastInto<Ptr<QObject>>, member: *const i8 ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const char* signal = …, const QObject* receiver = …, const char* member = …) const.

C++ documentation:

This function overloads disconnect().

Disconnects signal from method of receiver.

A signal-slot connection is removed when either of the objects involved are destroyed.

Note: This function is thread-safe.

pub unsafe fn disconnect_q_object_char( &self, receiver: impl CastInto<Ptr<QObject>>, member: *const i8 ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const QObject* receiver, const char* member = …) const.

C++ documentation:

This function overloads disconnect().

Disconnects all signals in this object from receiver's method.

A signal-slot connection is removed when either of the objects involved are destroyed.

pub unsafe fn disconnect_char_q_object( &self, signal: *const i8, receiver: impl CastInto<Ptr<QObject>> ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const char* signal = …, const QObject* receiver = …) const.

C++ documentation:

This function overloads disconnect().

Disconnects signal from method of receiver.

A signal-slot connection is removed when either of the objects involved are destroyed.

Note: This function is thread-safe.

pub unsafe fn disconnect_char(&self, signal: *const i8) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const char* signal = …) const.

C++ documentation:

This function overloads disconnect().

Disconnects signal from method of receiver.

A signal-slot connection is removed when either of the objects involved are destroyed.

Note: This function is thread-safe.

pub unsafe fn disconnect(&self) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect() const.

C++ documentation:

This function overloads disconnect().

Disconnects signal from method of receiver.

A signal-slot connection is removed when either of the objects involved are destroyed.

Note: This function is thread-safe.

pub unsafe fn disconnect_q_object( &self, receiver: impl CastInto<Ptr<QObject>> ) -> bool

This function overloads disconnect().

Calls C++ function: bool QObject::disconnect(const QObject* receiver) const.

C++ documentation:

This function overloads disconnect().

Disconnects all signals in this object from receiver's method.

A signal-slot connection is removed when either of the objects involved are destroyed.

pub unsafe fn dump_object_info_mut(&self)

Dumps information about signal connections, etc. for this object to the debug output.

Calls C++ function: void QObject::dumpObjectInfo().

C++ documentation:

Dumps information about signal connections, etc. for this object to the debug output.

Note: before Qt 5.9, this function was not const.

See also dumpObjectTree().

pub unsafe fn dump_object_info(&self)

Dumps information about signal connections, etc. for this object to the debug output.

Calls C++ function: void QObject::dumpObjectInfo() const.

C++ documentation:

Dumps information about signal connections, etc. for this object to the debug output.

Note: before Qt 5.9, this function was not const.

See also dumpObjectTree().

pub unsafe fn dump_object_tree_mut(&self)

Dumps a tree of children to the debug output.

Calls C++ function: void QObject::dumpObjectTree().

C++ documentation:

Dumps a tree of children to the debug output.

Note: before Qt 5.9, this function was not const.

See also dumpObjectInfo().

pub unsafe fn dump_object_tree(&self)

Dumps a tree of children to the debug output.

Calls C++ function: void QObject::dumpObjectTree() const.

C++ documentation:

Dumps a tree of children to the debug output.

Note: before Qt 5.9, this function was not const.

See also dumpObjectInfo().

pub unsafe fn dynamic_property_names(&self) -> CppBox<QListOfQByteArray>

Returns the names of all properties that were dynamically added to the object using setProperty().

Calls C++ function: QList<QByteArray> QObject::dynamicPropertyNames() const.

C++ documentation:

Returns the names of all properties that were dynamically added to the object using setProperty().

This function was introduced in Qt 4.2.

pub unsafe fn eq(&self, p: impl CastInto<Ref<QPointerOfQObject>>) -> bool

Returns true if c1 and c2 are the same Unicode character; otherwise returns false.

Calls C++ function: bool operator==(QObject* o, const QPointer<QObject>& p).

Warning: no exact match found in C++ documentation. Below is the C++ documentation for bool operator==(QChar c1, QChar c2):

Returns true if c1 and c2 are the same Unicode character; otherwise returns false.

pub unsafe fn event(&self, event: impl CastInto<Ptr<QEvent>>) -> bool

This virtual function receives events to an object and should return true if the event e was recognized and processed.

Calls C++ function: virtual bool QObject::event(QEvent* event).

C++ documentation:

This virtual function receives events to an object and should return true if the event e was recognized and processed.

The event() function can be reimplemented to customize the behavior of an object.

Make sure you call the parent event class implementation for all the events you did not handle.

Example:

class MyClass : public QWidget
{
      Q_OBJECT
public:
      MyClass(QWidget *parent = 0);
      ~MyClass();
      bool event(QEvent* ev)
      {
          if (ev->type() == QEvent::PolishRequest) {
              // overwrite handling of PolishRequest if any
              doThings();
              return true;
          } else  if (ev->type() == QEvent::Show) {
              // complement handling of Show if any
              doThings2();
              QWidget::event(ev);
              return true;
          }
          // Make sure the rest of events are handled
          return QWidget::event(ev);
      }
};

See also installEventFilter(), timerEvent(), QCoreApplication::sendEvent(), and QCoreApplication::postEvent().

pub unsafe fn event_filter( &self, watched: impl CastInto<Ptr<QObject>>, event: impl CastInto<Ptr<QEvent>> ) -> bool

Filters events if this object has been installed as an event filter for the watched object.

Calls C++ function: virtual bool QObject::eventFilter(QObject* watched, QEvent* event).

C++ documentation:

Filters events if this object has been installed as an event filter for the watched object.

In your reimplementation of this function, if you want to filter the event out, i.e. stop it being handled further, return true; otherwise return false.

Example:

class MainWindow : public QMainWindow
{
public:
      MainWindow();
protected:
      bool eventFilter(QObject obj, QEvent ev);
private:
      QTextEdit *textEdit;
};
MainWindow::MainWindow()
{
      textEdit = new QTextEdit;
      setCentralWidget(textEdit);
      textEdit->installEventFilter(this);
}
bool MainWindow::eventFilter(QObject obj, QEvent event)
{
      if (obj == textEdit) {
          if (event->type() == QEvent::KeyPress) {
              QKeyEvent keyEvent = static_cast<QKeyEvent>(event);
              qDebug() << “Ate key press” << keyEvent->key();
              return true;
          } else {
              return false;
          }
      } else {
          // pass the event on to the parent class
          return QMainWindow::eventFilter(obj, event);
      }
}

Notice in the example above that unhandled events are passed to the base class's eventFilter() function, since the base class might have reimplemented eventFilter() for its own internal purposes.

Warning: If you delete the receiver object in this function, be sure to return true. Otherwise, Qt will forward the event to the deleted object and the program might crash.

See also installEventFilter().

pub unsafe fn find_child_q_object_2a( &self, a_name: impl CastInto<Ref<QString>>, options: QFlags<FindChildOption> ) -> QPtr<QObject>

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QObject* QObject::findChild<QObject*>(const QString& aName = …, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

If there is more than one child matching the search, the most direct ancestor is returned. If there are several direct ancestors, it is undefined which one will be returned. In that case, findChildren() should be used.

This example returns a child QPushButton of parentWidget named "button1", even if the button isn't a direct child of the parent:

QPushButton button = parentWidget->findChild<QPushButton >(“button1”);

This example returns a QListWidget child of parentWidget:

QListWidget list = parentWidget->findChild<QListWidget >();

This example returns a child QPushButton of parentWidget (its direct parent) named "button1":

QPushButton button = parentWidget->findChild<QPushButton >(“button1”, Qt::FindDirectChildrenOnly);

This example returns a QListWidget child of parentWidget, its direct parent:

QListWidget list = parentWidget->findChild<QListWidget >(QString(), Qt::FindDirectChildrenOnly);

See also findChildren().

pub unsafe fn find_child_q_object_1a( &self, a_name: impl CastInto<Ref<QString>> ) -> QPtr<QObject>

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QObject* QObject::findChild<QObject*>(const QString& aName = …) const.

C++ documentation:

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

If there is more than one child matching the search, the most direct ancestor is returned. If there are several direct ancestors, it is undefined which one will be returned. In that case, findChildren() should be used.

This example returns a child QPushButton of parentWidget named "button1", even if the button isn't a direct child of the parent:

QPushButton button = parentWidget->findChild<QPushButton >(“button1”);

This example returns a QListWidget child of parentWidget:

QListWidget list = parentWidget->findChild<QListWidget >();

This example returns a child QPushButton of parentWidget (its direct parent) named "button1":

QPushButton button = parentWidget->findChild<QPushButton >(“button1”, Qt::FindDirectChildrenOnly);

This example returns a QListWidget child of parentWidget, its direct parent:

QListWidget list = parentWidget->findChild<QListWidget >(QString(), Qt::FindDirectChildrenOnly);

See also findChildren().

pub unsafe fn find_child_q_object_0a(&self) -> QPtr<QObject>

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QObject* QObject::findChild<QObject*>() const.

C++ documentation:

Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

If there is more than one child matching the search, the most direct ancestor is returned. If there are several direct ancestors, it is undefined which one will be returned. In that case, findChildren() should be used.

This example returns a child QPushButton of parentWidget named "button1", even if the button isn't a direct child of the parent:

QPushButton button = parentWidget->findChild<QPushButton >(“button1”);

This example returns a QListWidget child of parentWidget:

QListWidget list = parentWidget->findChild<QListWidget >();

This example returns a child QPushButton of parentWidget (its direct parent) named "button1":

QPushButton button = parentWidget->findChild<QPushButton >(“button1”, Qt::FindDirectChildrenOnly);

This example returns a QListWidget child of parentWidget, its direct parent:

QListWidget list = parentWidget->findChild<QListWidget >(QString(), Qt::FindDirectChildrenOnly);

See also findChildren().

pub unsafe fn find_children_q_object_q_string_q_flags_find_child_option( &self, a_name: impl CastInto<Ref<QString>>, options: QFlags<FindChildOption> ) -> CppBox<QListOfQObject>

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QString& aName = …, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

The following example shows how to find a list of child QWidgets of the specified parentWidget named widgetname:

QList<QWidget > widgets = parentWidget.findChildren<QWidget >(“widgetname”);

This example returns all QPushButtons that are children of parentWidget:

QList<QPushButton > allPButtons = parentWidget.findChildren<QPushButton >();

This example returns all QPushButtons that are immediate children of parentWidget:

QList<QPushButton > childButtons = parentWidget.findChildren<QPushButton >(QString(), Qt::FindDirectChildrenOnly);

See also findChild().

pub unsafe fn find_children_q_object_q_reg_exp_q_flags_find_child_option( &self, re: impl CastInto<Ref<QRegExp>>, options: QFlags<FindChildOption> ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegExp& re, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

This function overloads findChildren().

Returns the children of this object that can be cast to type T and that have names matching the regular expression regExp, or an empty list if there are no such objects. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

pub unsafe fn find_children_q_object_q_regular_expression_q_flags_find_child_option( &self, re: impl CastInto<Ref<QRegularExpression>>, options: QFlags<FindChildOption> ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegularExpression& re, QFlags<Qt::FindChildOption> options = …) const.

C++ documentation:

This function overloads findChildren().

Returns the children of this object that can be cast to type T and that have names matching the regular expression re, or an empty list if there are no such objects. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

This function was introduced in Qt 5.0.

pub unsafe fn find_children_q_object_q_string( &self, a_name: impl CastInto<Ref<QString>> ) -> CppBox<QListOfQObject>

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QString& aName = …) const.

C++ documentation:

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

The following example shows how to find a list of child QWidgets of the specified parentWidget named widgetname:

QList<QWidget > widgets = parentWidget.findChildren<QWidget >(“widgetname”);

This example returns all QPushButtons that are children of parentWidget:

QList<QPushButton > allPButtons = parentWidget.findChildren<QPushButton >();

This example returns all QPushButtons that are immediate children of parentWidget:

QList<QPushButton > childButtons = parentWidget.findChildren<QPushButton >(QString(), Qt::FindDirectChildrenOnly);

See also findChild().

pub unsafe fn find_children_q_object(&self) -> CppBox<QListOfQObject>

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>() const.

C++ documentation:

Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. Omitting the name argument causes all object names to be matched. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

The following example shows how to find a list of child QWidgets of the specified parentWidget named widgetname:

QList<QWidget > widgets = parentWidget.findChildren<QWidget >(“widgetname”);

This example returns all QPushButtons that are children of parentWidget:

QList<QPushButton > allPButtons = parentWidget.findChildren<QPushButton >();

This example returns all QPushButtons that are immediate children of parentWidget:

QList<QPushButton > childButtons = parentWidget.findChildren<QPushButton >(QString(), Qt::FindDirectChildrenOnly);

See also findChild().

pub unsafe fn find_children_q_object_q_reg_exp( &self, re: impl CastInto<Ref<QRegExp>> ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegExp& re) const.

C++ documentation:

This function overloads findChildren().

Returns the children of this object that can be cast to type T and that have names matching the regular expression regExp, or an empty list if there are no such objects. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

pub unsafe fn find_children_q_object_q_regular_expression( &self, re: impl CastInto<Ref<QRegularExpression>> ) -> CppBox<QListOfQObject>

This function overloads findChildren().

Calls C++ function: QList<QObject*> QObject::findChildren<QObject*>(const QRegularExpression& re) const.

C++ documentation:

This function overloads findChildren().

Returns the children of this object that can be cast to type T and that have names matching the regular expression re, or an empty list if there are no such objects. The search is performed recursively, unless options specifies the option FindDirectChildrenOnly.

This function was introduced in Qt 5.0.

pub unsafe fn inherits(&self, classname: *const i8) -> bool

Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false.

Calls C++ function: bool QObject::inherits(const char* classname) const.

C++ documentation:

Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false.

A class is considered to inherit itself.

Example:

QTimer *timer = new QTimer;         // QTimer inherits QObject
timer->inherits(“QTimer”);          // returns true
timer->inherits(“QObject”);         // returns true
timer->inherits(“QAbstractButton”); // returns false
// QVBoxLayout inherits QObject and QLayoutItem
QVBoxLayout *layout = new QVBoxLayout;
layout->inherits(“QObject”);        // returns true
layout->inherits(“QLayoutItem”);    // returns true (even though QLayoutItem is not a QObject)

If you need to determine whether an object is an instance of a particular class for the purpose of casting it, consider using qobject_cast<Type *>(object) instead.

See also metaObject() and qobject_cast().

pub unsafe fn install_event_filter( &self, filter_obj: impl CastInto<Ptr<QObject>> )

Installs an event filter filterObj on this object. For example:

Calls C++ function: void QObject::installEventFilter(QObject* filterObj).

C++ documentation:

Installs an event filter filterObj on this object. For example:

  monitoredObj->installEventFilter(filterObj);

An event filter is an object that receives all events that are sent to this object. The filter can either stop the event or forward it to this object. The event filter filterObj receives events via its eventFilter() function. The eventFilter() function must return true if the event should be filtered, (i.e. stopped); otherwise it must return false.

If multiple event filters are installed on a single object, the filter that was installed last is activated first.

Here's a KeyPressEater class that eats the key presses of its monitored objects:

class KeyPressEater : public QObject
{
      Q_OBJECT
      ...
protected:
      bool eventFilter(QObject obj, QEvent event);
};
bool KeyPressEater::eventFilter(QObject obj, QEvent event)
{
      if (event->type() == QEvent::KeyPress) {
          QKeyEvent keyEvent = static_cast<QKeyEvent >(event);
          qDebug(“Ate key press %d”, keyEvent->key());
          return true;
      } else {
          // standard event processing
          return QObject::eventFilter(obj, event);
      }
}

And here's how to install it on two widgets:

KeyPressEater keyPressEater = new KeyPressEater(this);
QPushButton pushButton = new QPushButton(this);
QListView *listView = new QListView(this);
pushButton->installEventFilter(keyPressEater);
listView->installEventFilter(keyPressEater);

The QShortcut class, for example, uses this technique to intercept shortcut key presses.

Warning: If you delete the receiver object in your eventFilter() function, be sure to return true. If you return false, Qt sends the event to the deleted object and the program will crash.

Note that the filtering object must be in the same thread as this object. If filterObj is in a different thread, this function does nothing. If either filterObj or this object are moved to a different thread after calling this function, the event filter will not be called until both objects have the same thread affinity again (it is not removed).

See also removeEventFilter(), eventFilter(), and event().

pub unsafe fn is_widget_type(&self) -> bool

Returns true if the object is a widget; otherwise returns false.

Calls C++ function: bool QObject::isWidgetType() const.

C++ documentation:

Returns true if the object is a widget; otherwise returns false.

Calling this function is equivalent to calling inherits("QWidget"), except that it is much faster.

pub unsafe fn is_window_type(&self) -> bool

Returns true if the object is a window; otherwise returns false.

Calls C++ function: bool QObject::isWindowType() const.

C++ documentation:

Returns true if the object is a window; otherwise returns false.

Calling this function is equivalent to calling inherits("QWindow"), except that it is much faster.

pub unsafe fn kill_timer(&self, id: i32)

Kills the timer with timer identifier, id.

Calls C++ function: void QObject::killTimer(int id).

C++ documentation:

Kills the timer with timer identifier, id.

The timer identifier is returned by startTimer() when a timer event is started.

See also timerEvent() and startTimer().

pub unsafe fn meta_object(&self) -> Ptr<QMetaObject>

Returns a pointer to the meta-object of this object.

Calls C++ function: virtual const QMetaObject* QObject::metaObject() const.

C++ documentation:

Returns a pointer to the meta-object of this object.

A meta-object contains information about a class that inherits QObject, e.g. class name, superclass name, properties, signals and slots. Every QObject subclass that contains the Q_OBJECT macro will have a meta-object.

The meta-object information is required by the signal/slot connection mechanism and the property system. The inherits() function also makes use of the meta-object.

If you have no pointer to an actual object instance but still want to access the meta-object of a class, you can use staticMetaObject.

Example:

QObject *obj = new QPushButton;
obj->metaObject()->className();             // returns “QPushButton”
QPushButton::staticMetaObject.className();  // returns “QPushButton”

See also staticMetaObject.

pub unsafe fn move_to_thread(&self, thread: impl CastInto<Ptr<QThread>>)

Changes the thread affinity for this object and its children. The object cannot be moved if it has a parent. Event processing will continue in the targetThread.

Calls C++ function: void QObject::moveToThread(QThread* thread).

C++ documentation:

Changes the thread affinity for this object and its children. The object cannot be moved if it has a parent. Event processing will continue in the targetThread.

To move an object to the main thread, use QApplication::instance() to retrieve a pointer to the current application, and then use QApplication::thread() to retrieve the thread in which the application lives. For example:

myObject->moveToThread(QApplication::instance()->thread());

If targetThread is zero, all event processing for this object and its children stops.

Note that all active timers for the object will be reset. The timers are first stopped in the current thread and restarted (with the same interval) in the targetThread. As a result, constantly moving an object between threads can postpone timer events indefinitely.

A QEvent::ThreadChange event is sent to this object just before the thread affinity is changed. You can handle this event to perform any special processing. Note that any new events that are posted to this object will be handled in the targetThread.

Warning: This function is not thread-safe; the current thread must be same as the current thread affinity. In other words, this function can only "push" an object from the current thread to another thread, it cannot "pull" an object from any arbitrary thread to the current thread.

See also thread().

pub unsafe fn object_name(&self) -> CppBox<QString>

This property holds the name of this object

Calls C++ function: QString QObject::objectName() const.

C++ documentation:

This property holds the name of this object

You can find an object by name (and type) using findChild(). You can find a set of objects with findChildren().

qDebug(“MyClass::setPrecision(): (%s) invalid precision %f”,
         qPrintable(objectName()), newPrecision);

By default, this property contains an empty string.

Access functions:

QString	objectName() const
void	setObjectName(const QString &name)

Notifier signal:

void

objectNameChanged(const QString &objectName)

[see note below]

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

See also metaObject() and QMetaObject::className().

pub unsafe fn parent(&self) -> QPtr<QObject>

Returns a pointer to the parent object.

Calls C++ function: QObject* QObject::parent() const.

C++ documentation:

Returns a pointer to the parent object.

See also setParent() and children().

pub unsafe fn property(&self, name: *const i8) -> CppBox<QVariant>

Returns the value of the object's name property.

Calls C++ function: QVariant QObject::property(const char* name) const.

C++ documentation:

Returns the value of the object’s name property.

If no such property exists, the returned variant is invalid.

Information about all available properties is provided through the metaObject() and dynamicPropertyNames().

See also setProperty(), QVariant::isValid(), metaObject(), and dynamicPropertyNames().

pub unsafe fn qt_metacall( &self, arg1: Call, arg2: i32, arg3: *mut *mut c_void ) -> i32

Calls C++ function: virtual int QObject::qt_metacall(QMetaObject::Call arg1, int arg2, void** arg3).

pub unsafe fn qt_metacast(&self, arg1: *const i8) -> *mut c_void

Calls C++ function: virtual void* QObject::qt_metacast(const char* arg1).

pub unsafe fn remove_event_filter(&self, obj: impl CastInto<Ptr<QObject>>)

Removes an event filter object obj from this object. The request is ignored if such an event filter has not been installed.

Calls C++ function: void QObject::removeEventFilter(QObject* obj).

C++ documentation:

Removes an event filter object obj from this object. The request is ignored if such an event filter has not been installed.

All event filters for this object are automatically removed when this object is destroyed.

It is always safe to remove an event filter, even during event filter activation (i.e. from the eventFilter() function).

See also installEventFilter(), eventFilter(), and event().

pub unsafe fn set_object_name(&self, name: impl CastInto<Ref<QString>>)

This property holds the name of this object

Calls C++ function: void QObject::setObjectName(const QString& name).

C++ documentation:

This property holds the name of this object

You can find an object by name (and type) using findChild(). You can find a set of objects with findChildren().

qDebug(“MyClass::setPrecision(): (%s) invalid precision %f”,
         qPrintable(objectName()), newPrecision);

By default, this property contains an empty string.

Access functions:

QString	objectName() const
void	setObjectName(const QString &name)

Notifier signal:

void

objectNameChanged(const QString &objectName)

[see note below]

Note: This is a private signal. It can be used in signal connections but cannot be emitted by the user.

See also metaObject() and QMetaObject::className().

pub unsafe fn set_parent(&self, parent: impl CastInto<Ptr<QObject>>)

Makes the object a child of parent.

Calls C++ function: void QObject::setParent(QObject* parent).

C++ documentation:

Makes the object a child of parent.

See also parent() and children().

pub unsafe fn set_property( &self, name: *const i8, value: impl CastInto<Ref<QVariant>> ) -> bool

Sets the value of the object's name property to value.

Calls C++ function: bool QObject::setProperty(const char* name, const QVariant& value).

C++ documentation:

Sets the value of the object’s name property to value.

If the property is defined in the class using Q_PROPERTY then true is returned on success and false otherwise. If the property is not defined using Q_PROPERTY, and therefore not listed in the meta-object, it is added as a dynamic property and false is returned.

Information about all available properties is provided through the metaObject() and dynamicPropertyNames().

Dynamic properties can be queried again using property() and can be removed by setting the property value to an invalid QVariant. Changing the value of a dynamic property causes a QDynamicPropertyChangeEvent to be sent to the object.

Note: Dynamic properties starting with "_q_" are reserved for internal purposes.

See also property(), metaObject(), dynamicPropertyNames(), and QMetaProperty::write().

pub unsafe fn signals_blocked(&self) -> bool

Returns true if signals are blocked; otherwise returns false.

Calls C++ function: bool QObject::signalsBlocked() const.

C++ documentation:

Returns true if signals are blocked; otherwise returns false.

Signals are not blocked by default.

See also blockSignals() and QSignalBlocker.

pub unsafe fn start_timer_2a(&self, interval: i32, timer_type: TimerType) -> i32

Starts a timer and returns a timer identifier, or returns zero if it could not start a timer.

Calls C++ function: int QObject::startTimer(int interval, Qt::TimerType timerType = …).

C++ documentation:

Starts a timer and returns a timer identifier, or returns zero if it could not start a timer.

A timer event will occur every interval milliseconds until killTimer() is called. If interval is 0, then the timer event occurs once every time there are no more window system events to process.

The virtual timerEvent() function is called with the QTimerEvent event parameter class when a timer event occurs. Reimplement this function to get timer events.

If multiple timers are running, the QTimerEvent::timerId() can be used to find out which timer was activated.

Example:

class MyObject : public QObject
{
      Q_OBJECT
public:
      MyObject(QObject *parent = 0);
protected:
      void timerEvent(QTimerEvent *event);
};
MyObject::MyObject(QObject *parent)
      : QObject(parent)
{
      startTimer(50);     // 50-millisecond timer
      startTimer(1000);   // 1-second timer
      startTimer(60000);  // 1-minute timer
      using namespace std::chrono;
      startTimer(milliseconds(50));
      startTimer(seconds(1));
      startTimer(minutes(1));
      // since C++14 we can use std::chrono::duration literals, e.g.:
      startTimer(100ms);
      startTimer(5s);
      startTimer(2min);
      startTimer(1h);
}
void MyObject::timerEvent(QTimerEvent *event)
{
      qDebug() << “Timer ID:” << event->timerId();
}

Note that QTimer's accuracy depends on the underlying operating system and hardware. The timerType argument allows you to customize the accuracy of the timer. See Qt::TimerType for information on the different timer types. Most platforms support an accuracy of 20 milliseconds; some provide more. If Qt is unable to deliver the requested number of timer events, it will silently discard some.

The QTimer class provides a high-level programming interface with single-shot timers and timer signals instead of events. There is also a QBasicTimer class that is more lightweight than QTimer and less clumsy than using timer IDs directly.

See also timerEvent(), killTimer(), and QTimer::singleShot().

pub unsafe fn start_timer_1a(&self, interval: i32) -> i32

Starts a timer and returns a timer identifier, or returns zero if it could not start a timer.

Calls C++ function: int QObject::startTimer(int interval).

C++ documentation:

Starts a timer and returns a timer identifier, or returns zero if it could not start a timer.

A timer event will occur every interval milliseconds until killTimer() is called. If interval is 0, then the timer event occurs once every time there are no more window system events to process.

The virtual timerEvent() function is called with the QTimerEvent event parameter class when a timer event occurs. Reimplement this function to get timer events.

If multiple timers are running, the QTimerEvent::timerId() can be used to find out which timer was activated.

Example:

class MyObject : public QObject
{
      Q_OBJECT
public:
      MyObject(QObject *parent = 0);
protected:
      void timerEvent(QTimerEvent *event);
};
MyObject::MyObject(QObject *parent)
      : QObject(parent)
{
      startTimer(50);     // 50-millisecond timer
      startTimer(1000);   // 1-second timer
      startTimer(60000);  // 1-minute timer
      using namespace std::chrono;
      startTimer(milliseconds(50));
      startTimer(seconds(1));
      startTimer(minutes(1));
      // since C++14 we can use std::chrono::duration literals, e.g.:
      startTimer(100ms);
      startTimer(5s);
      startTimer(2min);
      startTimer(1h);
}
void MyObject::timerEvent(QTimerEvent *event)
{
      qDebug() << “Timer ID:” << event->timerId();
}

Note that QTimer's accuracy depends on the underlying operating system and hardware. The timerType argument allows you to customize the accuracy of the timer. See Qt::TimerType for information on the different timer types. Most platforms support an accuracy of 20 milliseconds; some provide more. If Qt is unable to deliver the requested number of timer events, it will silently discard some.

The QTimer class provides a high-level programming interface with single-shot timers and timer signals instead of events. There is also a QBasicTimer class that is more lightweight than QTimer and less clumsy than using timer IDs directly.

See also timerEvent(), killTimer(), and QTimer::singleShot().

pub unsafe fn thread(&self) -> QPtr<QThread>

Returns the thread in which the object lives.

Calls C++ function: QThread* QObject::thread() const.

C++ documentation:

Returns the thread in which the object lives.

See also moveToThread().

Trait Implementations

impl CppDeletable for QScreen

unsafe fn delete(&self)

Destroys the screen.

Calls C++ function: virtual [destructor] void QScreen::~QScreen().

C++ documentation:

Destroys the screen.

impl Deref for QScreen

fn deref(&self) -> &QObject

Calls C++ function: QObject* static_cast<QObject*>(QScreen* ptr).

type Target = QObject

The resulting type after dereferencing.

impl DynamicCast<QScreen> for QObject

unsafe fn dynamic_cast(ptr: Ptr<QObject>) -> Ptr<QScreen>

Calls C++ function: QScreen* dynamic_cast<QScreen*>(QObject* ptr).

impl Size for QScreen

unsafe fn size(&self) -> usize

This property holds the pixel resolution of the screen

Calls C++ function: QSize QScreen::size() const.

C++ documentation:

This property holds the pixel resolution of the screen

Access functions:

QSize

size() const

Notifier signal:

void	geometryChanged(const QRect &geometry)

impl StaticDowncast<QScreen> for QObject

unsafe fn static_downcast(ptr: Ptr<QObject>) -> Ptr<QScreen>

Calls C++ function: QScreen* static_cast<QScreen*>(QObject* ptr).

impl StaticUpcast<QObject> for QScreen

unsafe fn static_upcast(ptr: Ptr<QScreen>) -> Ptr<QObject>

Calls C++ function: QObject* static_cast<QObject*>(QScreen* ptr).