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