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