Qt.QApplication Class

public class QApplication: QObject, System.IDisposable

Base Types

System.Object
  QtSupport
    QObject
      QApplication

This type implements System.IDisposable.

See Also

Qt Namespace

Members

QApplication Constructors

QApplication(System.String[]) Constructor
QApplication(System.String[], bool) Constructor
QApplication(System.String[], Type) Constructor
QApplication(void *, uint, uint) Constructor
QApplication(void *, System.String[], uint, uint) Constructor
QApplication(void *) Constructor
QApplication(void *, uint) Constructor
QApplication(void *, System.String[]) Constructor
QApplication(void *, System.String[], uint) Constructor

QApplication Methods

QApplication.ActiveModalWidget Method
QApplication.ActivePopupWidget Method
QApplication.ActiveWindow Method
QApplication.AddLibraryPath Method
QApplication.AllWidgets Method
QApplication.ApplicationId Method
QApplication.Argc Method
QApplication.Argv Method
QApplication.Beep Method
QApplication.Clipboard Method
QApplication.CloseAllWindows Method
QApplication.Close_xim Method
QApplication.ClosingDown Method
QApplication.CommitData Method
QApplication.Create_xim Method
QApplication.CursorFlashTime Method
QApplication.DefaultCodec Method
QApplication.Desktop Method
QApplication.DesktopSettingsAware Method
QApplication.DoubleClickInterval Method
QApplication.Enter_loop Method
QApplication.Exec Method
QApplication.Exit(int) Method
QApplication.Exit() Method
QApplication.Exit_loop Method
QApplication.Finalize Method
QApplication.Flush Method
QApplication.FlushX Method
QApplication.FocusWidget Method
QApplication.Font(Qt.QWidget) Method
QApplication.Font() Method
QApplication.FontMetrics Method
QApplication.GlobalStrut Method
QApplication.HasGlobalMouseTracking Method
QApplication.HasPendingEvents Method
QApplication.HorizontalAlignment Method
QApplication.InstallTranslator Method
QApplication.IsEffectEnabled Method
QApplication.IsSessionRestored Method
QApplication.LibraryPaths Method
QApplication.Locked Method
QApplication.LoopLevel Method
QApplication.MacEventFilter Method
QApplication.MainWidget Method
QApplication.Notify Method
QApplication.OverrideCursor Method
QApplication.Palette(Qt.QWidget) Method
QApplication.Palette() Method
QApplication.Polish Method
QApplication.ProcessEvents() Method
QApplication.ProcessEvents(int) Method
QApplication.Q_lock Method
QApplication.Quit Method
QApplication.QwsDecoration Method
QApplication.QwsEventFilter Method
QApplication.QwsSetCustomColors Method
QApplication.QwsSetDecoration Method
QApplication.RemoteControlEnabled Method
QApplication.RemoveLibraryPath Method
QApplication.RemovePostedEvents Method
QApplication.RemoveTranslator Method
QApplication.RestoreOverrideCursor Method
QApplication.ReverseLayout Method
QApplication.SaveState Method
QApplication.SendPostedEvents(Qt.QObject, int) Method
QApplication.SendPostedEvents() Method
QApplication.SessionId Method
QApplication.SetColorMode Method
QApplication.SetColorSpec Method
QApplication.SetCursorFlashTime Method
QApplication.SetDefaultCodec Method
QApplication.SetDesktopSettingsAware Method
QApplication.SetDoubleClickInterval Method
QApplication.SetEffectEnabled(Qt.UIEffect, bool) Method
QApplication.SetEffectEnabled(Qt.UIEffect) Method
QApplication.SetEnableRemoteControl(bool, Qt.QUuid) Method
QApplication.SetEnableRemoteControl(bool) Method
QApplication.SetFont(Qt.QFont, bool, System.String) Method
QApplication.SetFont(Qt.QFont) Method
QApplication.SetFont(Qt.QFont, bool) Method
QApplication.SetGlobalMouseTracking Method
QApplication.SetGlobalStrut Method
QApplication.SetLibraryPaths Method
QApplication.SetMainWidget Method
QApplication.SetOverrideCursor(Qt.QCursor, bool) Method
QApplication.SetOverrideCursor(Qt.QCursor) Method
QApplication.SetPalette(Qt.QPalette, bool, System.String) Method
QApplication.SetPalette(Qt.QPalette) Method
QApplication.SetPalette(Qt.QPalette, bool) Method
QApplication.SetReverseLayout Method
QApplication.SetStartDragDistance Method
QApplication.SetStartDragTime Method
QApplication.SetStyle(Qt.QStyle) Method
QApplication.SetStyle(System.String) Method
QApplication.SetWheelScrollLines Method
QApplication.SetWinStyleHighlightColor Method
QApplication.StartDragDistance Method
QApplication.StartDragTime Method
QApplication.StartingUp Method
QApplication.Style Method
QApplication.SyncX Method
QApplication.TheColorMode Method
QApplication.TheColorSpec Method
QApplication.TheType Method
QApplication.TopLevelWidgets Method
QApplication.Translate(System.String, System.String, System.String, Encoding) Method
QApplication.Translate(System.String, System.String) Method
QApplication.Translate(System.String, System.String, System.String) Method
QApplication.TryLock Method
QApplication.Unlock(bool) Method
QApplication.Unlock() Method
QApplication.WakeUpGuiThread Method
QApplication.WheelScrollLines Method
QApplication.WidgetAt(int, int, bool) Method
QApplication.WidgetAt(Qt.QPoint, bool) Method
QApplication.WidgetAt(int, int) Method
QApplication.WidgetAt(Qt.QPoint) Method
QApplication.WinEventFilter Method
QApplication.WinFocus Method
QApplication.WinMouseButtonUp Method
QApplication.WinStyleHighlightColor Method
QApplication.WinVersion Method
QApplication.X11ClientMessage Method
QApplication.X11EventFilter Method
QApplication.X11_apply_settings Method


QApplication(System.String[]) Constructor

public void QApplication(System.String[] argv);

See Also

Qt.QApplication Class, Qt Namespace

QApplication(System.String[], bool) Constructor

public void QApplication(System.String[] argv, bool GUIenabled);

See Also

Qt.QApplication Class, Qt Namespace

QApplication(System.String[], Type) Constructor

public void QApplication(System.String[] argv, Type arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication(void *, uint, uint) Constructor

public void QApplication(void * dpy, uint visual, uint cmap);

See Also

Qt.QApplication Class, Qt Namespace

QApplication(void *, System.String[], uint, uint) Constructor

public void QApplication(void * dpy, System.String[] argv, uint visual, uint cmap);

See Also

Qt.QApplication Class, Qt Namespace

QApplication(void *) Constructor

public void QApplication(void * dpy);

See Also

Qt.QApplication Class, Qt Namespace

QApplication(void *, uint) Constructor

public void QApplication(void * dpy, uint visual);

See Also

Qt.QApplication Class, Qt Namespace

QApplication(void *, System.String[]) Constructor

public void QApplication(void * dpy, System.String[] argv);

See Also

Qt.QApplication Class, Qt Namespace

QApplication(void *, System.String[], uint) Constructor

public void QApplication(void * dpy, System.String[] argv, uint visual);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.ActiveModalWidget Method

public static Qt.QWidget ActiveModalWidget();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.ActivePopupWidget Method

public static Qt.QWidget ActivePopupWidget();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.ActiveWindow Method

public Qt.QWidget ActiveWindow();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.AddLibraryPath Method

public static void AddLibraryPath(System.String arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.AllWidgets Method

public static Qt.QWidgetList AllWidgets();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.ApplicationId Method

public Qt.QUuid ApplicationId();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Argc Method

public int Argc();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Argv Method

public System.String[] Argv();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Beep Method

public static void Beep();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Clipboard Method

public static Qt.QClipboard Clipboard();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.CloseAllWindows Method

public void CloseAllWindows();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Close_xim Method

public static void Close_xim();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.ClosingDown Method

public static bool ClosingDown();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.CommitData Method

public void CommitData(Qt.QSessionManager sm);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Create_xim Method

public static void Create_xim();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.CursorFlashTime Method

public static int CursorFlashTime();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.DefaultCodec Method

public Qt.QTextCodec DefaultCodec();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Desktop Method

public static Qt.QDesktopWidget Desktop();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.DesktopSettingsAware Method

public static bool DesktopSettingsAware();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.DoubleClickInterval Method

public static int DoubleClickInterval();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Enter_loop Method

public int Enter_loop();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Exec Method

public int Exec();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Exit(int) Method

public static void Exit(int retcode);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Exit() Method

public static void Exit();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Exit_loop Method

public void Exit_loop();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Finalize Method

protected override void Finalize();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Flush Method

public static void Flush();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.FlushX Method

public static void FlushX();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.FocusWidget Method

public Qt.QWidget FocusWidget();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Font(Qt.QWidget) Method

public static Qt.QFont Font(Qt.QWidget arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Font() Method

public static Qt.QFont Font();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.FontMetrics Method

public static Qt.QFontMetrics FontMetrics();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.GlobalStrut Method

public static Qt.QSize GlobalStrut();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.HasGlobalMouseTracking Method

public static bool HasGlobalMouseTracking();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.HasPendingEvents Method

public bool HasPendingEvents();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.HorizontalAlignment Method

public static int HorizontalAlignment(int align);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.InstallTranslator Method

public void InstallTranslator(Qt.QTranslator arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.IsEffectEnabled Method

public static bool IsEffectEnabled(Qt.UIEffect arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.IsSessionRestored Method

public bool IsSessionRestored();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.LibraryPaths Method

public static Qt.QStringList LibraryPaths();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Locked Method

public bool Locked();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.LoopLevel Method

public int LoopLevel();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.MacEventFilter Method

public bool MacEventFilter(void * arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.MainWidget Method

public Qt.QWidget MainWidget();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Notify Method

public bool Notify(Qt.QObject arg1, Qt.QEvent arg2);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.OverrideCursor Method

public static Qt.QCursor OverrideCursor();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Palette(Qt.QWidget) Method

public static Qt.QPalette Palette(Qt.QWidget arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Palette() Method

public static Qt.QPalette Palette();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Polish Method

public void Polish(Qt.QWidget arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.ProcessEvents() Method

public void ProcessEvents();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.ProcessEvents(int) Method

public void ProcessEvents(int maxtime);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Q_lock Method

public void Q_lock();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Quit Method

public void Quit();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.QwsDecoration Method

public static void * QwsDecoration();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.QwsEventFilter Method

public bool QwsEventFilter(void * arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.QwsSetCustomColors Method

public void QwsSetCustomColors(int colortable, int start, int numColors);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.QwsSetDecoration Method

public static void QwsSetDecoration(void * arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.RemoteControlEnabled Method

public bool RemoteControlEnabled();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.RemoveLibraryPath Method

public static void RemoveLibraryPath(System.String arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.RemovePostedEvents Method

public static void RemovePostedEvents(Qt.QObject receiver);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.RemoveTranslator Method

public void RemoveTranslator(Qt.QTranslator arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.RestoreOverrideCursor Method

public static void RestoreOverrideCursor();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.ReverseLayout Method

public static bool ReverseLayout();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SaveState Method

public void SaveState(Qt.QSessionManager sm);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SendPostedEvents(Qt.QObject, int) Method

public static void SendPostedEvents(Qt.QObject receiver, int event_type);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SendPostedEvents() Method

public static void SendPostedEvents();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SessionId Method

public System.String SessionId();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetColorMode Method

public static void SetColorMode(ColorMode arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetColorSpec Method

public static void SetColorSpec(int arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetCursorFlashTime Method

public static void SetCursorFlashTime(int arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetDefaultCodec Method

public void SetDefaultCodec(Qt.QTextCodec arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetDesktopSettingsAware Method

public static void SetDesktopSettingsAware(bool arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetDoubleClickInterval Method

public static void SetDoubleClickInterval(int arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetEffectEnabled(Qt.UIEffect, bool) Method

public static void SetEffectEnabled(Qt.UIEffect arg1, bool enable);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetEffectEnabled(Qt.UIEffect) Method

public static void SetEffectEnabled(Qt.UIEffect arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetEnableRemoteControl(bool, Qt.QUuid) Method

public void SetEnableRemoteControl(bool enable, Qt.QUuid appId);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetEnableRemoteControl(bool) Method

public void SetEnableRemoteControl(bool enable);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetFont(Qt.QFont, bool, System.String) Method

public static void SetFont(Qt.QFont arg1, bool informWidgets, System.String className);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetFont(Qt.QFont) Method

public static void SetFont(Qt.QFont arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetFont(Qt.QFont, bool) Method

public static void SetFont(Qt.QFont arg1, bool informWidgets);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetGlobalMouseTracking Method

public static void SetGlobalMouseTracking(bool enable);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetGlobalStrut Method

public static void SetGlobalStrut(Qt.QSize arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetLibraryPaths Method

public static void SetLibraryPaths(Qt.QStringList arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetMainWidget Method

public void SetMainWidget(Qt.QWidget arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetOverrideCursor(Qt.QCursor, bool) Method

public static void SetOverrideCursor(Qt.QCursor arg1, bool replace);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetOverrideCursor(Qt.QCursor) Method

public static void SetOverrideCursor(Qt.QCursor arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetPalette(Qt.QPalette, bool, System.String) Method

public static void SetPalette(Qt.QPalette arg1, bool informWidgets, System.String className);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetPalette(Qt.QPalette) Method

public static void SetPalette(Qt.QPalette arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetPalette(Qt.QPalette, bool) Method

public static void SetPalette(Qt.QPalette arg1, bool informWidgets);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetReverseLayout Method

public static void SetReverseLayout(bool b);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetStartDragDistance Method

public static void SetStartDragDistance(int l);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetStartDragTime Method

public static void SetStartDragTime(int ms);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetStyle(Qt.QStyle) Method

public static void SetStyle(Qt.QStyle arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetStyle(System.String) Method

public static Qt.QStyle SetStyle(System.String arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetWheelScrollLines Method

public static void SetWheelScrollLines(int arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SetWinStyleHighlightColor Method

public static void SetWinStyleHighlightColor(Qt.QColor c);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.StartDragDistance Method

public static int StartDragDistance();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.StartDragTime Method

public static int StartDragTime();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.StartingUp Method

public static bool StartingUp();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Style Method

public static Qt.QStyle Style();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.SyncX Method

public static void SyncX();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.TheColorMode Method

public static ColorMode TheColorMode();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.TheColorSpec Method

public static int TheColorSpec();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.TheType Method

public Type TheType();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.TopLevelWidgets Method

public static Qt.QWidgetList TopLevelWidgets();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Translate(System.String, System.String, System.String, Encoding) Method

public System.String Translate(System.String context, System.String key, System.String comment, Encoding encoding);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Translate(System.String, System.String) Method

public System.String Translate(System.String context, System.String key);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Translate(System.String, System.String, System.String) Method

public System.String Translate(System.String context, System.String key, System.String comment);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.TryLock Method

public bool TryLock();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Unlock(bool) Method

public void Unlock(bool wakeUpGui);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.Unlock() Method

public void Unlock();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WakeUpGuiThread Method

public void WakeUpGuiThread();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WheelScrollLines Method

public static int WheelScrollLines();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WidgetAt(int, int, bool) Method

public static Qt.QWidget WidgetAt(int x, int y, bool child);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WidgetAt(Qt.QPoint, bool) Method

public static Qt.QWidget WidgetAt(Qt.QPoint arg1, bool child);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WidgetAt(int, int) Method

public static Qt.QWidget WidgetAt(int x, int y);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WidgetAt(Qt.QPoint) Method

public static Qt.QWidget WidgetAt(Qt.QPoint arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WinEventFilter Method

public bool WinEventFilter(void * arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WinFocus Method

public void WinFocus(Qt.QWidget arg1, bool arg2);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WinMouseButtonUp Method

public static void WinMouseButtonUp();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WinStyleHighlightColor Method

public static Qt.QColor WinStyleHighlightColor();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.WinVersion Method

public static Qt.WindowsVersion WinVersion();

See Also

Qt.QApplication Class, Qt Namespace

QApplication.X11ClientMessage Method

public int X11ClientMessage(Qt.QWidget arg1, void * arg2, bool passive_only);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.X11EventFilter Method

public bool X11EventFilter(void * arg1);

See Also

Qt.QApplication Class, Qt Namespace

QApplication.X11_apply_settings Method

public static bool X11_apply_settings();

See Also

Qt.QApplication Class, Qt Namespace