- o -
- off() : KLed
- offset() : KRuler
- okClicked() : KDialogBase
- on() : KLed , KToolBarButton
- opacity() : KRootPixmap
- openLink() : KActiveLabel
- openURL() : KAboutDialog , KAboutWidget
- openURLSlot() : KAboutDialog , KAboutWidget
- orientation() : KDockSplitter , KPanelApplet , KPanelExtension , KSelector , KSeparator
- orientationChange() : KPanelApplet
- originalText() : KLineEdit
- overwrite() : KStdGuiItem