Here is a list of all documented functions with links to the struct/union documentation for each field:

- u -

• UnfocusFocusedWidget() : Window
• UnFoldAll() : SettingsContainer, SettingsPage
• Uninitialize() : AI, Game, Squirrel
• Unload() : VehicleCargoList
• UnloadCount() : VehicleCargoList
• UnlockVideoBuffer() : VideoDriver, VideoDriver_Cocoa, VideoDriver_SDL_Base, VideoDriver_Win32Base
• UnmappedChoiceList() : UnmappedChoiceList
• Unpause() : AI, Game, ScriptInstance
• Unqueue() : LinkGraphSchedule
• UnregisterTimer() : TimerManager< TTimerType >
• UnreserveSingleTrack() : CYapfReserveTrack< Types >
• Unsafe() : CommandHelper< Tcmd, Tret(*)(DoCommandFlags, Targs...), true >
• UnsatisfiedDemandTo() : LinkGraphJob::NodeAnnotation
• Unselect() : ClientNetworkContentSocketHandler
• UnselectAll() : ClientNetworkContentSocketHandler
• UnselectVehicle() : VehicleGroupWindow
• Unshuffle() : MusicSystem
• Update() : Backup< T >, CargoDataEntry, LinkGraph::BaseEdge, OpenGLSprite
• UpdateAcceleration() : Train
• UpdateAfterLoad() : GroupStatistics
• UpdateAIButtonsState() : ScriptDebugWindow
• UpdateAnnotation() : CapacityAnnotation, DistanceAnnotation
• UpdateAutoRefitState() : OrdersWindow
• UpdateAutoreplace() : GroupStatistics
• UpdateAutoResolution() : VideoDriver
• UpdateBoundingBoxCoordinates() : Vehicle
• UpdateButtons() : BuildObjectWindow
• UpdateCache() : Ship
• UpdateCaretPosition() : Textbuf
• UpdateCursorPosition() : CursorVars
• UpdateCursorPositionRelative() : CursorVars
• UpdateDeltaXY() : Aircraft, DisasterVehicle, EffectVehicle, RoadVehicle, Ship, Train, Vehicle
• UpdateEdge() : LinkGraph::BaseNode
• UpdateFilterByTile() : BuildVehicleWindow
• UpdateFilterState() : NetworkContentListWindow, SettingEntry, SettingsContainer, SettingsPage
• UpdateGSButtonState() : ScriptDebugWindow
• UpdateHistoryScrollpos() : TextfileWindow
• UpdateInclination() : GroundVehicle< T, Type >
• UpdateLinks() : SmallMapWindow
• UpdateListPos() : NetworkGameWindow
• UpdateListPositionOnKeyPress() : Scrollbar
• UpdateLoadingTile() : CargoPacket
• UpdateLocation() : LinkGraph::BaseNode
• UpdateLogScroll() : ScriptDebugWindow
• UpdateMarkedText() : Textbuf
• UpdateMode() : BuildTreesWindow
• UpdateMultilineWidgetSize() : NWidgetResizeBase
• UpdateNewGRFScanStatus() : ScanProgressWindow
• UpdateOptionWidgetStatus() : BuildRoadToolbarWindow
• UpdateOskState() : OskWindow
• UpdateOverlayCargoes() : LinkGraphLegendWindow
• UpdateOverlayCompanies() : LinkGraphLegendWindow
• UpdatePalette() : OpenGLBackend
• UpdatePaymentRates() : PaymentRatesGraphWindow
• UpdatePosition() : DisasterVehicle, Scrollbar, TrackedViewportSign, Vehicle, ViewportSign
• UpdatePositionAndViewport() : Vehicle
• UpdatePrevNextDisabledState() : StoryBookWindow
• UpdateProfits() : GroupStatistics
• UpdateQueryStringSize() : Window
• UpdateRealOrderIndex() : Vehicle
• UpdateRefittability() : GRFTempEngineData
• UpdateSavedItems() : HousePickerCallbacks, PickerCallbacks, PickerCallbacksNewGRFClass< T >
• UpdateScale() : FrametimeGraphWindow
• UpdateScrollBars() : NewGRFWindow
• UpdateSelectionStates() : TimetableWindow
• UpdateSize() : NWidgetResizeBase, Textbuf
• UpdateSizeAndPosition() : DropdownWindow
• UpdateSpeed() : RoadVehicle, Train
• UpdateStatistics() : BaseGraphWindow, IndustryProductionGraphWindow
• UpdateStringIter() : Textbuf
• UpdateSupply() : LinkGraph::BaseNode
• UpdateTimetableDuration() : OrderList
• UpdateTotalDuration() : OrderList
• UpdateUnloadingTile() : CargoPacket
• UpdateVerticalSize() : NWidgetResizeBase
• UpdateViewport() : SpecializedVehicle< T, Type >, Vehicle
• UpdateViewportCoordinates() : NWidgetViewport
• UpdateVirtCoord() : BaseStation, Sign, Station, Town, Waypoint
• UpdateVisualEffect() : Vehicle
• UpdateWidgetSize() : AboutWindow, AIConfigWindow, BaseGraphWindow, BaseNetworkContentDownloadStatusWindow, BootstrapAskForDownloadWindow, BootstrapErrorWindow, BuildAirportWindow, BuildBridgeWindow, BuildDocksDepotWindow, BuildIndustryWindow, BuildObjectWindow, BuildRailDepotWindow, BuildRailStationWindow, BuildRoadDepotWindow, BuildRoadStationWindow, BuildSignalWindow, BuildTreesWindow, BuildVehicleWindow, BuyCompanyWindow, CheatWindow, CompanyFinancesWindow, CompanyInfrastructureWindow, CompanyStationsWindow, CompanyWindow, CreateScenarioWindow, CustomCurrencyWindow, DepotWindow, DropdownWindow, EnginePreviewWindow, ErrmsgWindow, FramerateWindow, FrametimeGraphWindow, GameOptionsWindow, GameSettingsWindow, GenerateLandscapeWindow, GenerateProgressWindow, GoalListWindow, GoalQuestionWindow, GSConfigWindow, IndustryCargoesWindow, IndustryDirectoryWindow, IndustryProductionGraphWindow, IndustryViewWindow, LandInfoWindow, LinkGraphLegendWindow, MessageHistoryWindow, MusicTrackSelectionWindow, MusicWindow, NetworkAskRelayWindow, NetworkAskSurveyWindow, NetworkClientListWindow, NetworkContentListWindow, NetworkGameWindow, NetworkJoinStatusWindow, NetworkStartServerWindow, NewGRFInspectWindow, NewGRFParametersWindow, NewGRFWindow, NewsWindow, OrdersWindow, PaymentRatesGraphWindow, PerformanceLeagueWindow, PerformanceRatingDetailWindow, PickerWindow, QueryStringWindow, QueryWindow, RefitWindow, ReplaceVehicleWindow, SaveLoadWindow, SavePresetWindow, ScanProgressWindow, ScenarioEditorLandscapeGenerationWindow, ScenarioEditorToolbarWindow, ScriptDebugWindow, ScriptLeagueWindow, ScriptListWindow, ScriptSettingsWindow, SelectCompanyLiveryWindow, SelectCompanyManagerFaceWindow, SelectGameWindow, SelectStationWindow< T >, SetDateWindow, SignListWindow, SpriteAlignerWindow, StationViewWindow, StatusBarWindow, StoryBookWindow, SubsidyListWindow, TextfileWindow, TimetableWindow, TooltipsWindow, TownAuthorityWindow, TownDirectoryWindow, TownViewWindow, VehicleDetailsWindow, VehicleGroupWindow, VehicleListWindow, VehicleViewWindow, Window
• UpdateWidth() : Textbuf
• UpdateZPosition() : GroundVehicle< T, Type >
• UpdateZPositionAndInclination() : GroundVehicle< T, Type >
• UpgradeCurrent() : NewGRFWindow
• Usage() : LinkProperties
• UseAsRandomAI() : AIInfo
• UsedBadgeClasses() : UsedBadgeClasses
• UseID() : FreeUnitIDGenerator
• UsePaletteAnimation() : Blitter, Blitter_32bppAnim, Blitter_32bppBase, Blitter_40bppAnim, Blitter_8bppBase, Blitter_Null
• UserIsAllowedToChangeNewGRFs() : GUISettings
• UsesHardwareAcceleration() : DriverFactoryBase, FVideoDriver_CocoaOpenGL, FVideoDriver_SDL_OpenGL
• UsesOriginalEconomy() : IndustrySpec
• UseSystemCursor() : VideoDriver, VideoDriver_CocoaOpenGL, VideoDriver_SDL_OpenGL
• UseUnreservedID() : EngineOverrideManager
• UsingWallclockUnits() : TimerGameEconomy
• Utf8Encode() : StringBuilder