| object | Qtc.Gui.QTextDocument |
| objectForFormat | Qtc.Gui.QTextDocument |
| objectIndex | Qtc.Gui.QTextFormat, Qtc.Gui.QTextObject |
| objectType | Qtc.Gui.QTextFormat |
| ObjectTypes | Qtc.Enums.Gui.QTextFormat |
| offset | Qtc.Gui.QImage |
| oldPos | Qtc.Gui.QHoverEvent, Qtc.Gui.QMoveEvent |
| oldPosF | Qtc.Gui.QHoverEvent |
| oldSize | Qtc.Gui.QResizeEvent |
| oldState | Qtc.Gui.QWindowStateChangeEvent |
| oldp | Qtc.Gui.QMoveEvent |
| olds | Qtc.Gui.QResizeEvent |
| opacity | Qtc.Gui.QPainter, Qtc.Gui.QPaintEngineState, Qtc.Gui.QPainter_PixmapFragment, Qtc.Gui.QWindow |
| openFile | Qtc.Gui.QFileOpenEvent |
| openGLFeatures | Qtc.Gui.QOpenGLFunctions |
| OpenGLModuleType | Qtc.Enums.Gui.QOpenGLContext |
| optimize | Qtc.Gui.QMatrix4x4 |
| optimizedWrite | Qtc.Gui.QImageWriter |
| option | Qtc.Gui.QImageIOHandler |
| option_h | Qtc.Gui.QImageIOHandler_h |
| options | Qtc.Gui.QSurfaceFormat |
| orientation | Qtc.Gui.QPageLayout, Qtc.Gui.QScreen |
| orientationUpdateMask | Qtc.Gui.QScreen |
| ortho | Qtc.Gui.QMatrix4x4, Qtc.Gui.QMatrix4x4 |
| overline | Qtc.Gui.QFont, Qtc.Gui.QFontInfo, Qtc.Gui.QGlyphRun |
| overlinePos | Qtc.Gui.QFontMetrics, Qtc.Gui.QFontMetricsF |
| ownsClipboard | Qtc.Gui.QClipboard |
| ownsFindBuffer | Qtc.Gui.QClipboard |
| ownsSelection | Qtc.Gui.QClipboard |