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Qt 4.8
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Qt 4.8
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The QPlatformScreen class provides an abstraction for visual displays. More...
#include <qplatformscreen_qpa.h>
Public Functions | |
| virtual QRect | availableGeometry () const |
| Reimplement in subclass to return the pixel geometry of the available space This normally is the desktop screen minus the task manager, global menubar etc. More... | |
| virtual int | depth () const =0 |
| Reimplement in subclass to return current depth of the screen. More... | |
| virtual QImage::Format | format () const =0 |
| Reimplement in subclass to return the image format which corresponds to the screen format. More... | |
| virtual QRect | geometry () const =0 |
| Reimplement in subclass to return the pixel geometry of the screen. More... | |
| virtual QSize | physicalSize () const |
| Reimplement this function in subclass to return the physical size of the screen. More... | |
| virtual void | setDirty (const QRect &) |
| virtual QWidget * | topLevelAt (const QPoint &point) const |
| Return the given top level widget for a given position. More... | |
| virtual | ~QPlatformScreen () |
 Public Functions inherited from QObject | |
| bool | blockSignals (bool b) |
| If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More... | |
| const QObjectList & | children () const |
| Returns a list of child objects. More... | |
| bool | connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const |
| bool | disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0) |
| bool | disconnect (const QObject *receiver, const char *member=0) |
| void | dumpObjectInfo () |
| Dumps information about signal connections, etc. More... | |
| void | dumpObjectTree () |
| Dumps a tree of children to the debug output. More... | |
| QList< QByteArray > | dynamicPropertyNames () const |
| Returns the names of all properties that were dynamically added to the object using setProperty(). More... | |
| virtual bool | event (QEvent *) |
| This virtual function receives events to an object and should return true if the event e was recognized and processed. More... | |
| virtual bool | eventFilter (QObject *, QEvent *) |
| Filters events if this object has been installed as an event filter for the watched object. More... | |
| template<typename T > | |
| T | findChild (const QString &aName=QString()) const |
| 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. More... | |
| template<typename T > | |
| QList< T > | findChildren (const QString &aName=QString()) const |
| 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. More... | |
| template<typename T > | |
| QList< T > | findChildren (const QRegExp &re) const |
| bool | inherits (const char *classname) const |
| Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More... | |
| void | installEventFilter (QObject *) |
| Installs an event filter filterObj on this object. More... | |
| bool | isWidgetType () const |
| Returns true if the object is a widget; otherwise returns false. More... | |
| void | killTimer (int id) |
| Kills the timer with timer identifier, id. More... | |
| virtual const QMetaObject * | metaObject () const |
| Returns a pointer to the meta-object of this object. More... | |
| void | moveToThread (QThread *thread) |
| Changes the thread affinity for this object and its children. More... | |
| QString | objectName () const |
| QObject * | parent () const |
| Returns a pointer to the parent object. More... | |
| QVariant | property (const char *name) const |
| Returns the value of the object's name property. More... | |
| Q_INVOKABLE | QObject (QObject *parent=0) |
| Constructs an object with parent object parent. More... | |
| void | removeEventFilter (QObject *) |
| Removes an event filter object obj from this object. More... | |
| void | setObjectName (const QString &name) |
| void | setParent (QObject *) |
| Makes the object a child of parent. More... | |
| bool | setProperty (const char *name, const QVariant &value) |
| Sets the value of the object's name property to value. More... | |
| void | setUserData (uint id, QObjectUserData *data) |
| bool | signalsBlocked () const |
| Returns true if signals are blocked; otherwise returns false. More... | |
| int | startTimer (int interval) |
| Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More... | |
| QThread * | thread () const |
| Returns the thread in which the object lives. More... | |
| QObjectUserData * | userData (uint id) const |
| virtual | ~QObject () |
| Destroys the object, deleting all its child objects. More... | |
Static Public Functions | |
| static QPlatformScreen * | platformScreenForWidget (const QWidget *widget) |
| Static Public Functions inherited from QObject | |
| static bool | connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection) |
| Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More... | |
| static bool | connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection) |
| static bool | disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member) |
| Disconnects signal in object sender from method in object receiver. More... | |
| static bool | disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member) |
| static uint | registerUserData () |
| static QString | tr (const char *sourceText, const char *comment=0, int n=-1) |
| static QString | trUtf8 (const char *sourceText, const char *comment=0, int n=-1) |
Additional Inherited Members | |
| Public Slots inherited from QObject | |
| void | deleteLater () |
| Schedules this object for deletion. More... | |
| Signals inherited from QObject | |
| void | destroyed (QObject *=0) |
| This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More... | |
| Static Public Variables inherited from QObject | |
| static const QMetaObject | staticMetaObject |
| This variable stores the meta-object for the class. More... | |
| Protected Functions inherited from QObject | |
| virtual void | childEvent (QChildEvent *) |
| This event handler can be reimplemented in a subclass to receive child events. More... | |
| virtual void | connectNotify (const char *signal) |
| This virtual function is called when something has been connected to signal in this object. More... | |
| virtual void | customEvent (QEvent *) |
| This event handler can be reimplemented in a subclass to receive custom events. More... | |
| virtual void | disconnectNotify (const char *signal) |
| This virtual function is called when something has been disconnected from signal in this object. More... | |
| QObject (QObjectPrivate &dd, QObject *parent=0) | |
| int | receivers (const char *signal) const |
| Returns the number of receivers connected to the signal. More... | |
| QObject * | sender () const |
| Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More... | |
| int | senderSignalIndex () const |
| virtual void | timerEvent (QTimerEvent *) |
| This event handler can be reimplemented in a subclass to receive timer events for the object. More... | |
| Protected Variables inherited from QObject | |
| QScopedPointer< QObjectData > | d_ptr |
| Static Protected Variables inherited from QObject | |
| static const QMetaObject | staticQtMetaObject |
| Related Functions inherited from QObject | |
| T | qFindChildqFindChildren (const QObject *obj, const QString &name)() |
| QList< T > | qFindChildrenqFindChildren (const QObject *obj, const QString &name)() |
| QList< T > | qFindChildrenqFindChildren (const QObject *obj, const QRegExp ®Exp)() |
| T * | qobject_cast (QObject *object) |
| QObjectList | |
| void * | qt_find_obj_child (QObject *parent, const char *type, const QString &name) |
| Returns a pointer to the object named name that inherits type and with a given parent. More... | |
The QPlatformScreen class provides an abstraction for visual displays.
Many window systems has support for retrieving information on the attached displays. To be able to query the display QPA uses QPlatformScreen. Qt its self is most dependent on the physicalSize() function, since this is the function it uses to calculate the dpi to use when converting point sizes to pixels sizes. However, this is unfortunate on some systems, as the native system fakes its dpi size.
QPlatformScreen is also used by the public api QDesktopWidget for information about the desktop.
Definition at line 62 of file qplatformscreen_qpa.h.
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inlinevirtual |
Definition at line 66 of file qplatformscreen_qpa.h.
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inlinevirtual |
Reimplement in subclass to return the pixel geometry of the available space This normally is the desktop screen minus the task manager, global menubar etc.
Reimplemented in QBBScreen.
Definition at line 69 of file qplatformscreen_qpa.h.
Referenced by QVFbWindowSurface::resize(), QEglFSWindow::setGeometry(), and QVFbWindow::setGeometry().
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pure virtual |
Reimplement in subclass to return current depth of the screen.
Implemented in QFbScreen, QOpenKODEScreen, QBBScreen, QXlibScreen, QEglFSScreen, QDirectFbScreen, QXcbScreen, QCocoaScreen, QVFbScreen, QWaylandScreen, QUIKitScreen, and QMinimalScreen.
Referenced by effectiveState().
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pure virtual |
Reimplement in subclass to return the image format which corresponds to the screen format.
Implemented in QFbScreen, QOpenKODEScreen, QBBScreen, QXlibScreen, QEglFSScreen, QDirectFbScreen, QXcbScreen, QCocoaScreen, QVFbScreen, QWaylandScreen, QUIKitScreen, and QMinimalScreen.
Referenced by QWaylandShmWindowSurface::resize(), and QEglProperties::setPaintDeviceFormat().
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pure virtual |
Reimplement in subclass to return the pixel geometry of the screen.
Implemented in QFbScreen, QOpenKODEScreen, QBBScreen, QXlibScreen, QEglFSScreen, QDirectFbScreen, QXcbScreen, QCocoaScreen, QVFbScreen, QWaylandScreen, QUIKitScreen, and QMinimalScreen.
Referenced by QPlatformSoftwareCursor::changeCursor(), QPlatformSoftwareCursor::drawCursor(), effectiveState(), QPlatformSoftwareCursor::getCurrentRect(), physicalSize(), QPlatformSoftwareCursor::pointerEvent(), qt_defaultDpiX(), qt_defaultDpiY(), and QDesktopWidgetPrivate::updateScreenList().
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virtual |
Reimplement this function in subclass to return the physical size of the screen.
This function is used by QFont to convert point sizes to pixel sizes.
The default implementation takes the pixel size of the screen, considers a resolution of 100 dots per inch, and returns the calculated physical size. A device with a screen that has different resolutions will need to be supported by a suitable reimplementation of this function.
Reimplemented in QFbScreen, QBBScreen, QXlibScreen, QDirectFbScreen, QXcbScreen, QCocoaScreen, QVFbScreen, and QUIKitScreen.
Definition at line 79 of file qplatformscreen_qpa.cpp.
Referenced by effectiveState(), QBBScreenEventHandler::handleTouchEvent(), qt_defaultDpiX(), and qt_defaultDpiY().
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static |
Definition at line 88 of file qplatformscreen_qpa.cpp.
Referenced by effectiveState(), QBBScreenEventHandler::handleTouchEvent(), QWaylandNativeInterface::qPlatformScreenForWidget(), QXlibNativeInterface::qPlatformScreenForWidget(), QXcbNativeInterface::qPlatformScreenForWidget(), QUIKitWindow::QUIKitWindow(), QXcbWindow::QXcbWindow(), QXcbWindowSurface::QXcbWindowSurface(), QXcbWindowSurface::resize(), QWaylandShmWindowSurface::resize(), QXlibScreen::testLiteScreenForWidget(), toDfbScreen(), and QWaylandScreen::waylandScreenFromWidget().
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inlinevirtual |
Reimplemented in QFbScreen, QLinuxFbScreen, QVFbScreen, QVNCScreen, and QVFbScreen.
Definition at line 74 of file qplatformscreen_qpa.h.
Referenced by QPlatformSoftwareCursor::setDirty().
Return the given top level widget for a given position.
Default implementation retrieves a list of all top level widgets and finds the first widget which contains point pos
Reimplemented in QFbScreen.
Definition at line 56 of file qplatformscreen_qpa.cpp.