View

View is the base class for every element in the Xui visual tree. A view participates in layout, rendering, input hit-testing, and may contain child views.

The class is split across several partial files, each covering one concern:

Article	Covers
Hierarchy	Count, indexer, add/remove child helpers
Lifecycle	OnAttach, OnActivate, OnDeactivate, OnDetach
Layout	Update, Measure/Arrange/Render pipeline, LuminarFlow vs FORK
State	ViewFlags, invalidation, validation, change propagation
Input	Pointer, scroll wheel, keyboard events
Focus	Focusable, IsFocused, Focus(), Blur()
DI	IServiceProvider, GetService, parent-chain resolution
Layers	ILayer structs — zero-allocation composable building blocks for input widgets

Properties

Property	Description
Id	Optional identifier for lookup via ViewExtensions.FindViewById
ClassName	Class names for lookup via ViewExtensions.FindViewsByClass
Parent	Parent in the visual hierarchy (set automatically)
Frame	Border-edge rectangle in window-relative coordinates (set during Arrange)
Margin	External spacing; participates in collapsed margin logic
HorizontalAlignment	How the view fills its horizontal slot (default: Stretch)
VerticalAlignment	How the view fills its vertical slot (default: Stretch)
Direction	Block/inline flow direction (inherited if Inherit)
WritingMode	Horizontal or vertical text flow
Flow	How the layout system treats children
MinimumWidth / MinimumHeight	Size floor for the border-edge box
MaximumWidth / MaximumHeight	Size ceiling for the border-edge box

Hit testing

public virtual bool HitTest(Point point)

Returns true if point (in window coordinates) falls within this view or any child. The default implementation iterates children in reverse order (top-most first) and falls back to Frame.Contains(point).