Pretext.Uno Helpers

Pretext.Uno is the companion package that adds reusable Uno-side helpers on top of the core Pretext engine.

Controls

`StretchScrollHost`

A simple page-level container that:

wraps content in a ScrollViewer
stretches the child width to the host width
exposes ContentBackground and ContentPadding
can compute local viewport bounds for a target element

This is useful for sample-like pages or long document surfaces that need viewport-relative calculations.

`UiRenderScheduler`

A small dispatcher-backed scheduler that coalesces repeated render requests into a single DispatcherQueue callback.

Use it when:

many UI events can trigger a redraw
you want to avoid stacking redundant render passes
your custom surface already owns a render action

Layout types

`WrapMetrics`

Aggregate metrics for a wrapped text block:

LineCount
Height
MaxLineWidth

`PositionedLine`

Represents one laid-out line placed into a coordinate system:

Text
X
Y
Width

Obstacle primitives

RectObstacle
CircleObstacle
Interval

These are the geometric primitives used by the obstacle-aware helpers.

Layout helpers

`PreparedTextMetrics`

Utility methods for common wrap calculations:

MeasureMaxLineWidth
CollectWrapMetrics
FindTightWrapMetrics
IsEnd

`ColumnFlowLayout`

Flows prepared text through rectangular columns while respecting rectangular and circular obstacles.

`ObstacleLayoutHelper`

Lower-level helper methods for carving intervals and selecting usable slots around obstacles.

When to use the companion package

Use Pretext.Uno when your application already targets Uno and wants to reuse the same helper patterns as the sample app. If you only need the text preparation and layout engine, stay on the core Pretext package.