Enums and value types

Every enum and every value type a component property or an item model carries, with what each member means. A property page links here from its type.

Value types

A length, a colour, a text appearance: built from a static member, or written as its parts.

`ColorVariant`

From NE.Colors, a package of its own: the names are listed here, and what they mean is in the colour vocabulary and in its own repository.

Member	Meaning
`FromRgb(byte red, byte green, byte blue, ColorAdjustment adjustment = ColorAdjustment.None, int factor = 0, byte opacity = 255)`
`FromColor(Color color, ColorAdjustment adjustment = ColorAdjustment.None, int factor = 0)`
`TryParseHex(string text, ColorVariant variant)`
`MinFactor`
`MaxFactor`
`ColorName Name`
`ColorAdjustment Adjustment`
`int Factor`
`byte Opacity`
`int? Rgb`

`UIActionArgument`

Represents a value, binding, or contextual value passed to a UI action.

Member	Meaning
`Literal(object value)`	Creates a literal action argument from a value.
`CurrentItem()`	Creates an action argument resolved from the current item.
`CurrentItemKey()`	Creates an action argument resolved from the current item key.
`EventKey(int index)`	Creates an action argument resolved from the key at `index` of the event's own key chain.
`Bind(UIBindingPath binding)`	Creates an action argument resolved from a binding path.
`UIActionArgumentKind Kind`	How this argument is resolved.
`object Value`	The literal value for literal arguments, and the place in the event's key chain for an event key.
`UIBindingPath? Binding`	The binding path for binding arguments.

`UIBindingPath`

Represents a recursive binding path and the context used to resolve it.

Member	Meaning
`Relative(RecursivePath path)`	Creates a binding path resolved relative to the current binding context.
`Parent(RecursivePath path)`	Creates a binding path resolved relative to the parent binding context.
`Root(RecursivePath path)`	Creates a binding path resolved relative to the root binding context.
`RecursivePath Path`	The recursive binding path.
`UIBindingScope Scope`	The context used to resolve the path.

`UIComponentReference`

Identifies an authoring component reference before compilation/runtime resolution.

Member	Meaning
`ValidateDynamicParameters(object[] dynamicParameters)`	Validates that all dynamic parameters are supported reference parameter values.
`string Id`	The authoring component id.
`object[] DynamicParameters`	Dynamic reference parameters used for templated or repeated component instances.
`bool HasDynamicParameters`	Whether this reference contains dynamic parameters.

`UICornerRadius`

Represents corner radius values for a rectangular UI element.

Member	Meaning
`All(double topLeft, double topRight, double bottomRight, double bottomLeft)`	Creates a corner radius with an independent value for each corner.
`Uniform(double radius)`	Creates a corner radius applying the same value to all four corners.
`Top(double radius)`	Creates a corner radius rounding only the top corners, leaving the bottom corners square.
`Bottom(double radius)`	Creates a corner radius rounding only the bottom corners, leaving the top corners square.
`double TopLeft`	The top-left corner's radius, in pixels.
`double TopRight`	The top-right corner's radius, in pixels.
`double BottomRight`	The bottom-right corner's radius, in pixels.
`double BottomLeft`	The bottom-left corner's radius, in pixels.

`UIGridPlacement`

Represents a component placement in a fixed-column grid.

UIGridPlacement.Column and UIGridPlacement.Row are 1-based.

Member	Meaning
`At(int column, int row, int columnSpan = 1, int rowSpan = 1)`	Creates a placement at the given column and row with the given spans.
`GridColumns`	Gets the number of columns in the standard UI grid.
`int Column`	The 1-based column the component starts in.
`int Row`	The 1-based row the component starts in.
`int ColumnSpan`	How many columns the component covers.
`int RowSpan`	How many rows the component covers.

`UIGridUnit`

Represents a grid track size, with the floor and ceiling a splitter may move it between.

The platform holds what its layout can hold — a star track's floor, a content track's floor or ceiling — and a GridSplitter clamps to the rest; a fixed track's bounds only say how far it may be dragged.

Member	Meaning
`Star(double value = 1, double? min = null, double? max = null)`	Creates a proportional (star-sized) grid track, optionally bounded by a minimum and/or maximum in pixels.
`Absolute(double value, double? min = null, double? max = null)`	Creates a fixed-size grid track, optionally bounded for a splitter by a minimum and/or maximum in pixels.
`Auto(double? min = null, double? max = null)`	Creates a content-sized grid track, optionally bounded by a minimum and/or maximum.
`UIGridUnitType Unit`	How the track is sized: a fixed length, a share of the free space, or its content.
`double Value`	The size in the unit's own terms.
`double? MinValue`	The floor a splitter may drag the track down to.
`double? MaxValue`	The ceiling a splitter may drag the track up to.
`bool HasBounds`	Whether the track carries a floor or a ceiling.

`UILayoutLength`

Represents a layout length value.

Member	Meaning
`Auto()`	Creates a layout length that sizes automatically to its content.
`Absolute(double value)`	Creates a layout length with a fixed absolute value.
`Fill()`	The whole of what the parent gives.
`UILayoutLengthKind Kind`	Whether the length is absolute, a share of the free space, or the content's own.
`double Value`	The length in the kind's own terms; ignored by the kinds that carry none.

`UIProperty`

Represents a UI component property key.

Member	Meaning
`string Name`	The property name.

`UIPropertyReference`

Identifies a component property by authoring component reference and property key.

Member	Meaning
`UIComponentReference Component`	The authoring component reference.
`UIProperty Property`	The component property key.

`UISelectionStyle`

What a chosen item looks like: its ground, its ink, and a mark on one edge; any unset part keeps the control's own default.

Reaches the stylesheet as four custom properties (--ui-selected-*), so a custom look and the built-in ones share one rule set.

Member	Meaning
`Ground(UIThemeColor background)`	A chosen item that says so only by its ground.
`Marked(UISelectionMark mark, UIThemeColor? markColor = null)`	A chosen item that says so by a line on one edge, in the given colour or the theme's primary.
`UIThemeColor? Background`	The ground a chosen item is drawn on.
`UIThemeColor? Foreground`	The ink a chosen item's text takes.
`UISelectionMark? Mark`	The edge a chosen item is marked on.
`UIThemeColor? MarkColor`	The mark's own colour.
`bool? Bold`	Whether a chosen item's text is drawn bold.

`UITemporalStep`

Represents a step value for temporal input components.

Member	Meaning
`Days(int value)`	Creates a step measured in days.
`Hours(int value)`	Creates a step measured in hours.
`Minutes(int value)`	Creates a step measured in minutes.
`Seconds(int value)`	Creates a step measured in seconds.
`UITemporalStepUnit Unit`	The unit one step counts in.
`int Value`	How many units one step moves.

`UITextAppearance`

Represents a text's typography: either a semantic UITextType role, or an explicit UITextAppearance.Size override.

When UITextAppearance.Size is set, it always wins over UITextAppearance.Role — mirroring how UIThemeColor's explicit override wins over its semantic style.

Member	Meaning
`FromRole(UITextType role)`	Creates a text appearance tracking the given semantic `UITextType` role live.
`Custom(double size, int? weight = null, double? lineHeight = null, double? letterSpacing = null)`	Creates a text appearance from an explicit font size, optionally overriding weight, line-height, and letter-spacing.
`Display`	The largest, most prominent typographic role, for hero-style text, tracked live via `UITextAppearance.FromRole`.
`Title`	The typographic role for primary headings, tracked live via `UITextAppearance.FromRole`.
`Subtitle`	The typographic role for secondary headings, tracked live via `UITextAppearance.FromRole`.
`Body`	The typographic role for regular body text, tracked live via `UITextAppearance.FromRole`.
`Caption`	The typographic role for small, supplementary text, tracked live via `UITextAppearance.FromRole`.
`Overline`	The typographic role for small label text placed above content, tracked live via `UITextAppearance.FromRole`.
`UITextType? Role`	The semantic role the theme's typography sizes the text from; used only while `Size` is unset.
`double? Size`	An explicit size, in pixels, which wins over the role.
`int? Weight`	An explicit font weight; read only alongside an explicit size.
`double? LineHeight`	An explicit line height, in pixels; read only alongside an explicit size.
`double? LetterSpacing`	An explicit letter spacing, in pixels; read only alongside an explicit size.

`UIThemeColor`

Represents a themed color: either a semantic UIColorStyle role, or an explicit UIThemeColor.Light/UIThemeColor.Dark override, which always wins when both are set.

Member	Meaning
`FromStyle(UIColorStyle style)`	Creates a theme color tracking the given semantic `UIColorStyle` role live.
`FromColorVariant(ColorName name, ColorAdjustment adjustment = ColorAdjustment.None, int factor = 0, byte opacity = 255)`	Creates a theme color from a fixed color variant, used identically in both light and dark mode.
`FromColorVariant(ColorVariant color)`	Creates a theme color from a fixed color variant, used identically in both light and dark mode.
`Create(ColorVariant? light, ColorVariant? dark)`	Creates a theme color from explicit light and dark overrides.
`TryParse(string text, UIThemeColor color)`	Reads the canonical wire form a client sends back: `@Role` for a semantic role, `#RRGGBBAA` for an explicit colour, or `Name/Adjustment/factor/opacity` for a palette variant.
`Default`	Presets mirroring each `UIColorStyle` role, theme-aware via `UIThemeColor.FromStyle`.
`Primary`	The theme's primary brand color, tracked live via `UIThemeColor.FromStyle`.
`Accent`	The theme's secondary accent color, tracked live via `UIThemeColor.FromStyle`.
`Background`	The page/surface background color, tracked live via `UIThemeColor.FromStyle`.
`Surface`	A raised surface's background color (e.g. a card), tracked live via `UIThemeColor.FromStyle`.
`OnPrimary`	A color intended to sit on top of `UIThemeColor.Primary`, tracked live via `UIThemeColor.FromStyle`.
`OnAccent`	A color intended to sit on top of `UIThemeColor.Accent`, tracked live via `UIThemeColor.FromStyle`.
`OnBackground`	A color intended to sit on top of `UIThemeColor.Background`, tracked live via `UIThemeColor.FromStyle`.
`OnSurface`	A color intended to sit on top of `UIThemeColor.Surface`, tracked live via `UIThemeColor.FromStyle`.
`Info`	The informational status color, tracked live via `UIThemeColor.FromStyle`.
`Warning`	The warning status color, tracked live via `UIThemeColor.FromStyle`.
`Success`	The success status color, tracked live via `UIThemeColor.FromStyle`.
`Danger`	The danger/error status color, tracked live via `UIThemeColor.FromStyle`.
`OnInfo`	A color intended to sit on top of `UIThemeColor.Info`, tracked live via `UIThemeColor.FromStyle`.
`OnWarning`	A color intended to sit on top of `UIThemeColor.Warning`, tracked live via `UIThemeColor.FromStyle`.
`OnSuccess`	A color intended to sit on top of `UIThemeColor.Success`, tracked live via `UIThemeColor.FromStyle`.
`OnDanger`	A color intended to sit on top of `UIThemeColor.Danger`, tracked live via `UIThemeColor.FromStyle`.
`Muted`	A dimmed variant of the ambient color, for secondary/de-emphasized text, tracked live via `UIThemeColor.FromStyle`.
`Selected`	The chrome token indicating a selected item or state, tracked live via `UIThemeColor.FromStyle`.
`FocusRing`	The focus indicator ring color, tracked live via `UIThemeColor.FromStyle`.
`Border`	The default border color, tracked live via `UIThemeColor.FromStyle`.
`Shadow`	The drop shadow color, tracked live via `UIThemeColor.FromStyle`.
`Overlay`	The modal/scrim overlay color, tracked live via `UIThemeColor.FromStyle`.
`UIColorStyle? Style`	The semantic role the palette resolves the colour from.
`ColorVariant? Light`	An explicit colour for the light theme, which wins over the style.
`ColorVariant? Dark`	An explicit colour for the dark theme, which wins over the style.

`UIThickness`

Represents thickness values for the four sides of a rectangular UI element.

Member	Meaning
`All(double left, double top, double right, double bottom)`	Creates a thickness with an independent value for each side.
`Uniform(double value)`	Creates a thickness applying the same value to all four sides.
`Symmetric(double horizontal, double vertical)`	Creates a thickness applying one value to the left/right sides and another to the top/bottom sides.
`double Left`	The left side's value, in pixels.
`double Top`	The top side's value, in pixels.
`double Right`	The right side's value, in pixels.
`double Bottom`	The bottom side's value, in pixels.

`UIValidationMessage`

A validation message a controller puts on an input: the severity and the text. Null on the property means none.

Member	Meaning
`Error(string message)`	A message that refuses the value.
`Warning(string message)`	A message that warns about the value without refusing it.
`Info(string message)`	A message that only tells the viewer something about the value.
`UIValidationSeverity Severity`	How the message is drawn and whether it refuses a submit.
`string Message`	The text shown under the input, or in its marker's tooltip.

Enums

`ColorAdjustment`

From NE.Colors, a package of its own: the names are listed here, and what they mean is in the colour vocabulary and in its own repository.

Member	Meaning
`None`
`Shade`
`Tint`

`ColorName`

From NE.Colors, a package of its own: the names are listed here, and what they mean is in the colour vocabulary and in its own repository.

Member	Meaning
`IronFog`
`SilverNight`
`BronzeDusk`
`StellarRed`
`NebulaRose`
`LunarPink`
`SolarAmber`
`NebulaGold`
`LunarYellow`
`EclipseOlive`
`NebulaLime`
`LunarSage`
`AuroraGreen`
`NebulaMint`
`LunarFern`
`AstralTeal`
`NebulaCyan`
`LunarMoss`
`QuantumBlue`
`NebulaAqua`
`LunarAzure`
`NovaPurple`
`NebulaViolet`
`LunarLavender`
`Comet`
`Flare`
`Ember`
`Photon`
`Vortex`
`Halo`

`UIActionArgumentKind`

Defines how an interaction action argument is resolved.

Member	Meaning
`Literal`	The argument value is a fixed literal.
`CurrentItem`	The argument value is the current item of the enclosing items scope.
`CurrentItemKey`	The argument value is the key of the current item of the enclosing items scope.
`Binding`	The argument value is resolved from a binding.
`EventKey`	The argument value is one key of the event's own chain, by its place in it — for an event that names its keys itself.

`UIAlignment`

Defines cross-axis or main-axis alignment for UI layout.

Member	Meaning
`Start`	Aligns content to the start of the axis.
`Center`	Aligns content to the center of the axis.
`End`	Aligns content to the end of the axis.
`Stretch`	Stretches content to fill the axis.

`UIBadgeType`

Defines visual variants for badge-like components.

Member	Meaning
`Primary`	The theme's primary brand color variant.
`Accent`	The theme's secondary accent color variant.
`Info`	The informational status color variant.
`Warning`	The warning status color variant.
`Success`	The success status color variant.
`Danger`	The danger/error status color variant.
`Surface`	A card-like distinct background variant with no color accent.

`UIBindingMode`

Defines how data flows between a binding source and a UI target.

Member	Meaning
`OneWay`	Updates flow only from the binding source to the UI target.
`TwoWay`	Updates flow in both directions between the binding source and the UI target.
`OneWayToSource`	Updates flow only from the UI target to the binding source.
`OnSubmit`	Target-to-source updates are buffered until an explicit submit occurs.

`UIBindingScope`

Defines the component context used to resolve a binding path.

Member	Meaning
`Relative`	Resolves the binding path relative to the component's own context.
`Parent`	Resolves the binding path relative to the parent component's context.
`Root`	Resolves the binding path relative to the root context.

`UIButtonSize`

How much room a button takes, independent of what it holds.

Member	Meaning
`Small`	Sized to sit inside a row, a toolbar or a list without setting its height.
`Medium`	The ordinary control height — a button standing on its own.
`Large`	A call to action, where the button is the point of what it sits in.

`UIButtonType`

Defines visual variants for button-like components.

Member	Meaning
`Primary`	The theme's primary brand color variant.
`Accent`	The theme's secondary accent color variant.
`Danger`	The danger/error status color variant.
`Outline`	A bordered variant with a transparent background.
`Ghost`	A borderless, transparent-background variant.
`Link`	A variant styled as an inline text link.
`Surface`	A raised surface with no tint of its own — what a row in a list of destinations looks like, and the variant `ActionComponent` starts on.

`UIColorInputVariant`

How a colour input presents itself when it is closed.

Member	Meaning
`Field`	A field, reading the colour as text, with a swatch beside it and the picker's own button.
`Swatch`	A swatch alone, with the colour written across it.

`UIColorStyle`

Defines semantic color roles used by UI components.

Member	Meaning
`Default`	No explicit color override; inherits the ambient color.
`Primary`	The theme's primary brand color.
`Accent`	The theme's secondary accent color.
`Background`	The page/surface background color.
`Surface`	A raised surface's background color (e.g. a card).
`OnPrimary`	A color intended to sit on top of `UIColorStyle.Primary`.
`OnAccent`	A color intended to sit on top of `UIColorStyle.Accent`.
`OnBackground`	A color intended to sit on top of `UIColorStyle.Background`.
`OnSurface`	A color intended to sit on top of `UIColorStyle.Surface`.
`Info`	The informational status color.
`Warning`	The warning status color.
`Success`	The success status color.
`Danger`	The danger/error status color.
`OnInfo`	A color intended to sit on top of `UIColorStyle.Info`.
`OnWarning`	A color intended to sit on top of `UIColorStyle.Warning`.
`OnSuccess`	A color intended to sit on top of `UIColorStyle.Success`.
`OnDanger`	A color intended to sit on top of `UIColorStyle.Danger`.
`Muted`	A dimmed variant of the ambient color, for secondary/de-emphasized text.
`Selected`	The color indicating a selected item or state.
`FocusRing`	The color of the focus indicator ring around focused elements.
`Border`	The default border color.
`Shadow`	The color used for drop shadows.
`Overlay`	The color used for modal/scrim overlay backgrounds.

`UIColorTextFormat`

How a colour input writes the colour it holds.

Member	Meaning
`Hex`	`#RRGGBB`, and `#RRGGBBAA` once the colour is not fully opaque.
`Rgb`	`rgb(r, g, b)`, and `rgba(r, g, b, a)` once the colour is not fully opaque.

`UIComparisonOperator`

Defines comparison operators used by UI validation and interaction rules.

Member	Meaning
`Required`	The value must be present (not null, empty, or whitespace).
`Equal`	The value must equal the comparison value.
`NotEqual`	The value must not equal the comparison value.
`Greater`	The value must be greater than the comparison value.
`GreaterOrEqual`	The value must be greater than or equal to the comparison value.
`Less`	The value must be less than the comparison value.
`LessOrEqual`	The value must be less than or equal to the comparison value.
`Like`	The value must contain the comparison value as a substring.
`In`	The value must be contained in the comparison value's collection.
`Regex`	The value must match the comparison value as a regular expression.
`LikeIgnoreCase`	The value must contain the comparison value as a substring, ignoring case.

`UIDayOfWeek`

Defines days of week using Monday as the first day.

Member	Meaning
`Monday`	Monday.
`Tuesday`	Tuesday.
`Wednesday`	Wednesday.
`Thursday`	Thursday.
`Friday`	Friday.
`Saturday`	Saturday.
`Sunday`	Sunday.

`UIGridUnitType`

Defines the unit type used by grid layout measurements.

Member	Meaning
`Star`	A proportional share of the remaining available space.
`Absolute`	A fixed size expressed in device-independent units.
`Auto`	Sized to fit its content, optionally bounded by a minimum and/or maximum.

`UIGroupSeparator`

Defines what a bar draws between two groups of its items.

Member	Meaning
`None`	Nothing: the groups run into each other.
`Gap`	A step of air wider than the spacing between items.
`Rule`	A hairline across the bar.

`UIIconSize`

Defines standard icon sizes used by UI components.

Member	Meaning
`Small`	The smallest standard icon size.
`Medium`	The default, medium icon size.
`Large`	The largest standard icon size.

`UIImageFit`

Defines how an image is fitted into its layout bounds; null leaves it to the platform's default.

Member	Meaning
`Fill`	Stretches the image to fill its bounds, ignoring aspect ratio.
`Contain`	Scales the image to fit entirely within its bounds while preserving aspect ratio.
`Cover`	Scales the image to cover its bounds while preserving aspect ratio, cropping if needed.
`None`	Renders the image at its natural size, without scaling.

`UIImageInputShape`

The shape an image input takes.

Member	Meaning
`Picture`	A large picture: a drop area with the picture as its preview.
`Avatar`	A small round picture replaced in place — a person, a team, a project.
`Inline`	A row like the file input's: a thumbnail, the picture's name, and the pick control at the end.

`UIInputAppearance`

Defines how an input draws the surface around its field.

Member	Meaning
`Filled`	One fill and no visible edge: the field reads as the surface one level above the page it sits on.
`Outline`	No fill, and a border all the way round.
`Underline`	No fill, and a single rule under the text — what an edit-in-place field wants.
`Ghost`	No box until it is touched: the text sits on whatever is behind it, a wash under the pointer says it can be edited, the ring says it is. Tighter than the others, for a field that stands in a row of a list.

`UIItemsHostMode`

How an items host holds its rows.

Member	Meaning
`Plain`	Every row is in the document.
`Virtualized`	The client holds every item's value and keeps only the rows in view in the document.
`Windowed`	The items come from a source on the controller, one window at a time.

`UIItemsLayoutType`

Defines layout modes for items-based components.

Member	Meaning
`Stack`	Lays out items sequentially along a single axis.
`Wrap`	Flows items left to right, wrapping onto new lines when space runs out. An item takes its content's width; a template root with a placement takes that span of the 24-column grid instead (a span of 6 is four items to a line).

`UIItemsSortDirection`

Defines the sort direction for an items view.

Member	Meaning
`Ascending`	Sorts items from lowest to highest.
`Descending`	Sorts items from highest to lowest.

`UILayoutLengthKind`

Defines the kind of layout length value.

Member	Meaning
`Auto`	The length is determined automatically based on content.
`Absolute`	The length is a fixed value expressed in device-independent units.
`Fill`	The whole of what the parent gives: a page that fills the viewport, a pane that fills its track.

`UIMenuItemKind`

Defines what one entry of a menu is: a selectable item, a section header, a separator, an option with a check mark, or a setting whose choices open beside it.

Member	Meaning
`Item`	A selectable entry: icon, title, and either a URL or a command.
`Header`	A caption introducing the entries below it. Not selectable.
`Separator`	A rule between entries. Carries no content.
`Check`	An option that is on or off: a check mark at the entry's end says which. The click is the entry's command; the controller flips `Checked`.
`Select`	A setting: its current `Value` at the entry's end, and its nested entries — the choices — opening beside it on click, whatever the menu's fold.

`UIOrientation`

Defines horizontal or vertical orientation.

Member	Meaning
`Horizontal`	Content flows along the horizontal axis.
`Vertical`	Content flows along the vertical axis.

`UIOverflow`

Defines whether a container clips content that overflows its bounds.

Member	Meaning
`Hidden`	Content that overflows the container's bounds is clipped.
`Show`	Content that overflows the container's bounds remains visible.

`UIPopupPlacement`

Defines where a popup prefers to sit relative to its anchor; a side with no room for it flips to its opposite.

Member	Meaning
`BottomStart`	Below the anchor, aligned to its start edge.
`Bottom`	Below the anchor, centered on it.
`BottomEnd`	Below the anchor, aligned to its end edge.
`TopStart`	Above the anchor, aligned to its start edge.
`Top`	Above the anchor, centered on it.
`TopEnd`	Above the anchor, aligned to its end edge.
`LeftStart`	To the left of the anchor, aligned to its start edge.
`Left`	To the left of the anchor, centered on it.
`LeftEnd`	To the left of the anchor, aligned to its end edge.
`RightStart`	To the right of the anchor, aligned to its start edge.
`Right`	To the right of the anchor, centered on it.
`RightEnd`	To the right of the anchor, aligned to its end edge.

`UIProgressVariant`

Defines progress indicator presentation variants.

Member	Meaning
`Linear`	Renders progress as a horizontal bar.
`Circular`	Renders progress as a circular ring.

`UIResponsiveTier`

One of the viewport tiers a UIResponsive value names — where each starts above the base is the platform's breakpoint table (640, 768, 1280 and 1536 CSS pixels on the web).

Member	Meaning
`Base`	The narrowest viewport, where every responsive value starts; a column hidden below it is never hidden.
`Sm`
`Md`
`Xl`
`Xxl`

`UIScrollAnchor`

Defines how a scrollable container reacts when its content grows.

Member	Meaning
`None`	The container keeps its scroll position, which is the platform's own behavior.
`End`	The container follows content appended at the end while the viewer is already at the end.

`UIScrollMode`

Defines scroll behavior for scrollable UI regions.

Member	Meaning
`Disabled`	Scrolling is disabled; overflowing content is not reachable by scrolling.
`Auto`	Scrolling is enabled only when content overflows the available space.
`Always`	Scrolling is always enabled, regardless of whether content overflows.

`UIScrollSnapMode`

Defines the strictness with which a scrollable region snaps to item boundaries.

Member	Meaning
`Disabled`	Scroll snapping is disabled.
`Proximity`	The scroll position snaps to the nearest boundary only when it comes to rest near one.
`Mandatory`	The scroll position always snaps to a boundary at the end of scrolling.

`UISearchSelectionDisplayMode`

Defines how a selected search item is displayed in the search input.

Member	Meaning
`KeepSearchInput`	Keeps the user's typed search text in the input after a selection is made.
`ReplaceWithSelectedItem`	Replaces the input's text with the selected item's display value.

`UISelectionMark`

Defines the edge a chosen item draws its mark on — the line a tab has under it, a sidebar entry has beside it — or that it draws none.

Member	Meaning
`None`	No mark: the ground and the ink say it.
`Left`	A line down the left edge.
`Right`	A line down the right edge.
`Top`	A line along the top edge.
`Bottom`	A line along the bottom edge.

`UISelectionMode`

Defines how many of a list's items the viewer can have chosen at once.

Member	Meaning
`None`	None: the rows are not chosen by clicking them.
`One`	One at a time — choosing a row lets the previous one go.
`Many`	Any number — a click toggles the row it lands on.

`UISide`

Defines the edge of its parent a component is attached to — the side a panel folds toward when it collapses.

Member	Meaning
`Left`	The left edge.
`Right`	The right edge.
`Top`	The top edge.
`Bottom`	The bottom edge.

`UISplitButtonMode`

Which part of a split button opens its menu.

Member	Meaning
`Split`	The main part runs the button's own command; the end part opens the menu.
`Menu`	The whole button opens the menu — a menu button; the button's own click command is not used.

`UISurfaceStyle`

What a bordered surface is made of.

Member	Meaning
`Background`	The page's own background inside a border — a surface that reads as part of the page.
`Raised`	A panel lifted off the page it sits on, with its own fill and shadow.
`Tinted`	The surface's own colour mixed into the page instead of painted over it; takes the colour from `Background`, falling back to the theme's primary when none is set.

`UITemporalStepUnit`

Defines time units used by temporal input step values.

Member	Meaning
`Day`	The step value is expressed in days.
`Hour`	The step value is expressed in hours.
`Minute`	The step value is expressed in minutes.
`Second`	The step value is expressed in seconds.

`UITextAlignment`

Defines text alignment within its layout bounds.

Member	Meaning
`Start`	Aligns text to the leading edge of its container.
`Center`	Centers text within its container.
`End`	Aligns text to the trailing edge of its container.
`Justify`	Stretches text so each line fills the width of its container.

`UITextAreaResizeMode`

Defines resize behavior for multiline text input components.

Member	Meaning
`None`	The text area cannot be resized by the user.
`Vertical`	The text area can be resized vertically only.
`Horizontal`	The text area can be resized horizontally only.
`Both`	The text area can be resized both horizontally and vertically.

`UITextBadgeAlignment`

Defines where a trailing badge sits against the text beside it.

Member	Meaning
`Title`	On the title's own line, at its far end — the badge marks the title.
`Content`	Centred against title and description together — the badge stands for the whole block.

`UITextBadgePlacement`

Defines where a badge in text content is placed.

Member	Meaning
`Inline`	The badge is placed inline within the text content.
`Trailing`	The badge is placed after the text content.

`UITextIconAlignment`

Where a text body's leading icon sits against the text beside it.

Member	Meaning
`Title`	On the title's own line, with the description flowing underneath it — the icon marks the title.
`Content`	Centred against title and description together — the icon stands for the whole block, as in a list row or a card header.

`UITextInputType`

Defines semantic input types for text input components.

Member	Meaning
`Text`	Plain, unformatted text input.
`Email`	Input intended for an email address, with matching keyboard/validation hints.
`Password`	Input intended for a password, masking the entered characters.
`Search`	Input intended for a search query.
`Tel`	Input intended for a telephone number, with matching keyboard hints.
`Url`	Input intended for a URL, with matching keyboard/validation hints.

`UITextType`

Defines semantic text roles used by text components.

Member	Meaning
`Display`	The largest, most prominent typographic role, for hero-style text.
`Title`	The typographic role for primary headings.
`Subtitle`	The typographic role for secondary headings.
`Body`	The typographic role for regular body text.
`Caption`	The typographic role for small, supplementary text.
`Overline`	The typographic role for small label text placed above content.

`UITextWrapMode`

Defines text wrapping behavior. A wrapping text is clamped by MaxLines, with an ellipsis on the last line it keeps.

Member	Meaning
`NoWrap`	Text is kept on a single line, overflowing its container if needed.
`Wrap`	Text wraps onto multiple lines as needed to fit its container.

`UIThemeMode`

The two themes a surface can be forced into. null means "inherit" on a component and "follow the platform" on a session.

Member	Meaning
`Light`	Always uses the light theme.
`Dark`	Always uses the dark theme.

`UIValidationPresentation`

Where a field's validation message goes: a line under the field, or a mark at its edge that speaks in a tooltip.

Member	Meaning
`Auto`	A line under the field, except where the field sits in a cell of a grid — a table's, a key-value row's — where it is a mark.
`Message`	A line under the field, wherever the field is.
`Marker`	A mark at the field's edge, the message in its tooltip; the field keeps its height.

`UIValidationSeverity`

What a validation message means: an error stops a submit, a warning and an info only say something.

Member	Meaning
`Error`	Blocks a submit and draws both the required marker and the field's edge.
`Warning`	Colours the field's edge but never blocks a submit.
`Info`	Speaks only under the field, without touching its edge or blocking a submit.

`UIValidationTrigger`

Defines when a UI validation rule is evaluated.

Member	Meaning
`Change`	The rule is evaluated whenever the value changes.
`Blur`	The rule is evaluated when the input loses focus.
`Submit`	The rule is evaluated when the form is submitted.

`UIVisibility`

Defines what a component does with the room it was given: fills it, keeps it empty, or gives it back.

Member	Meaning
`Visible`	Drawn, and taking part in everything: layout, hit-testing, focus and assistive technology.
`Hidden`	Not drawn, but still holding its place — the layout around it does not move.
`Collapsed`	Gone from the layout as well: everything after it closes the gap.