# yuiScrollBarGeometry

A yui scroll bar geometry record carrying axis, trackStart, trackLength, thumbStart, thumbLength, and related state.

Last updated: 2026-09-09

Package: ui | Status: source-declared

Tags: cpu, method, source-example, thing, ui, yeho

Build YUI's reusable control, layout, interaction, text, accessibility, and retained-rendering models.

```yh
external thing yuiScrollBarGeometry
```

- text axis: Stores axis as text.
- int trackStart: Stores track start as int.
- int trackLength: Stores track length as int.
- int thumbStart: Stores thumb start as int.
- int thumbLength: Stores thumb length as int.
- bool visible: Stores visible as bool.
- yuiScrollBarGeometry(text axis, int trackStart, int trackLength, int thumbStart, int thumbLength, bool visible): Yui scroll bar geometry.
- Describe() returns text: Describe.

## Use yuiScrollBarGeometry

A complete small caller. Values are illustrative; check the returned result and package requirements before connecting live resources.

Verification: type checked

```yh
using ui

// Build YUI's reusable control, layout, interaction, text, accessibility, and retained-rendering models.
yuiScrollBarGeometry sample = yuiScrollBarGeometry("axis", 1, 1, 1, 1, true)
Console.Log(Text.From(sample.axis))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.ui__yuiscrollbargeometry"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "graphics.image"
version = "0.1.0"
path = "../../../yeho/packages/graphics/image"

[[dependencies]]
package = "graphics.text"
version = "0.1.0"
path = "../../../yeho/packages/graphics/text"

[[dependencies]]
package = "host.ui_services"
version = "0.1.0"
path = "../../../yeho/packages/host/ui_services"

[[dependencies]]
package = "ui"
version = "0.2.0"
path = "../../../yeho/packages/ui"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/ui--yuiScrollBarGeometry/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## yuiScrollBarGeometry.Describe

A complete caller for this public method. Sample inputs are illustrative; native resources require their owning lifecycle.

Verification: type checked

```yh
using ui

// Describe.
yuiScrollBarGeometry instance = yuiScrollBarGeometry("axis", 1, 1, 1, 1, true)
text result = instance.Describe()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.ui__yuiscrollbargeometry"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "graphics.image"
version = "0.1.0"
path = "../../../yeho/packages/graphics/image"

[[dependencies]]
package = "graphics.text"
version = "0.1.0"
path = "../../../yeho/packages/graphics/text"

[[dependencies]]
package = "host.ui_services"
version = "0.1.0"
path = "../../../yeho/packages/host/ui_services"

[[dependencies]]
package = "ui"
version = "0.2.0"
path = "../../../yeho/packages/ui"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/ui--yuiScrollBarGeometry/method-Describe-7 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


Package presence and a declaration do not establish support on every host. Host services need their platform and lifecycle setup.

Source: yeho/packages/ui/layout-scroll.yh

AI training permission: https://demonhunterlabs.com/ai-use