LengthContext

Remarks

This is the context Vixen.Ui.Styling deliberately does not have. The cascade decides which declaration wins without knowing what any of it measures, and that separation is what lets a stylesheet be resolved once and applied to two surfaces of different sizes.

Everything here is in device-independent pixels. DPI scaling is applied at the far end, when the draw list becomes geometry, so a stylesheet is not re-resolved because a window moved to another monitor.

Fields and properties (5)

• public float FontSize

  The element's own computed font size, in pixels. What em means — except on font-size itself, where em means the parent's and this must therefore be the parent's too.

• public float RootFontSize

  The root element's computed font size. What rem means.

• public float ViewportWidth

  The surface's width in pixels. A hundredth of it is 1vw.

• public float ViewportHeight

  The surface's height. A hundredth of it is 1vh.

• public const float InitialFontSize

  CSS's initial font size, which is what a document with no font-size gets.

Methods (5)

• public LengthContext(float FontSize, float RootFontSize, float ViewportWidth, float ViewportHeight)

  What a relative length is relative to.

• public static LengthContext ForViewport(float width, float height, float rootFontSize = 16)

  A context for a surface, before any element's own font size is known.

• public LengthContext WithFontSize(float fontSize)

  The same context with a different font size.

• public float PixelsPer(StyleUnit unit)

  How many pixels one of a unit is worth.

• public StyleLength ToLength(StyleValue value)

  Turns a parsed value into a length layout can use.

Used by (12)

• BridgeFixtureVixen.Ui.Tests
• ContextMenuVixen.Ui.Controls
• DrawListBuilderVixen.Ui
• LayoutStyleBridgeTestsVixen.Ui.Tests
• LayoutStyleBuilderVixen.Ui
• OverlayVixen.Ui.Controls
• UiDocumentVixen.Ui
• UiElementVixen.Ui
• UiSurfaceVixen.Ui
• UiTestVixen.Ui.Testing
• AddComponentMenuTestsVixen.Editor.App.Tests
• CommandPaletteVixen.Editor.Ui