Here is a list of all properties with links to the classes they belong to:

- r -

• ramp : QgsColorBrewerColorRampDialog, QgsColorBrewerColorRampWidget, QgsCptCityColorRampDialog, QgsGradientColorRampDialog, QgsLimitedRandomColorRampDialog, QgsLimitedRandomColorRampWidget, QgsPresetColorRampDialog, QgsPresetColorRampWidget
• ratioMode : QgsScaleComboBox
• readOnly : QgsVectorLayer
• referencedFields : QgsRelation
• referencedLayer : QgsRelation
• referencedLayerExpression : QgsPolymorphicRelation
• referencedLayerField : QgsPolymorphicRelation
• referencedLayerId : QgsRelation
• referencingFields : QgsRelation
• referencingLayer : QgsPolymorphicRelation, QgsRelation
• referencingLayerId : QgsRelation
• relationManager : QgsProject
• relativeStorage : QgsExternalResourceWidget, QgsFileWidget
• rotation : QgsQuickMapSettings