# yuiThemeDefinition

A yui theme definition record carrying id, displayName, mode, tokens, source, 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 yuiThemeDefinition
```

- text id: Stores id as text.
- text displayName: Stores display name as text.
- text mode: Stores mode as text.
- list of yuiVisualToken tokens: Stores tokens as list of yuiVisualToken.
- text source: Stores source as text.
- text diagnostic: Stores diagnostic as text.
- text cachedValidation: Stores cached validation as text.
- bool validationCached: Stores validation cached as bool.
- yuiThemeDefinition(text id, text displayName, text mode, text source): Yui theme definition.
- TokenIndex(text name) returns int: Token index.
- RegisterToken(yuiVisualToken token) returns bool: Register token.
- HasToken(text name) returns bool: Has token.
- Resolve(text name, text source) returns yuiVisualResolution: Resolve.
- ValidationIssue() returns text: Validation issue.
- ComputeValidationIssue() returns text: Compute validation issue.
- RenderReport() returns text: Render report.

## Use yuiThemeDefinition

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.
yuiThemeDefinition sample = yuiThemeDefinition("id", "display Name", "mode", "example")
Console.Log(Text.From(sample.id))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.ui__yuithemedefinition"
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--yuiThemeDefinition/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## yuiThemeDefinition.TokenIndex

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

Verification: type checked

```yh
using ui

// Token index.
yuiThemeDefinition instance = yuiThemeDefinition("id", "display Name", "mode", "example")
text argument_name = "argument name"
int result = instance.TokenIndex(argument_name)
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.ui__yuithemedefinition"
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--yuiThemeDefinition/method-TokenIndex-9 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## yuiThemeDefinition.RegisterToken

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

Verification: type checked

```yh
using ui

// Register token.
yuiThemeDefinition instance = yuiThemeDefinition("id", "display Name", "mode", "example")
yuiVisualToken argument_token = yuiVisualToken("Nova", "category", "text Value", 1, yuiColor(1, 1, 1, 1), "example")
bool result = instance.RegisterToken(argument_token)
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.ui__yuithemedefinition"
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--yuiThemeDefinition/method-RegisterToken-10 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## yuiThemeDefinition.HasToken

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

Verification: type checked

```yh
using ui

// Has token.
yuiThemeDefinition instance = yuiThemeDefinition("id", "display Name", "mode", "example")
text argument_name = "argument name"
bool result = instance.HasToken(argument_name)
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.ui__yuithemedefinition"
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--yuiThemeDefinition/method-HasToken-11 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## yuiThemeDefinition.Resolve

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

Verification: type checked

```yh
using ui

// Resolve.
yuiThemeDefinition instance = yuiThemeDefinition("id", "display Name", "mode", "example")
text argument_name = "argument name"
text argument_source = "argument source"
yuiVisualResolution result = instance.Resolve(argument_name, argument_source)
Console.Log("Inspect result in your debugger")

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.ui__yuithemedefinition"
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--yuiThemeDefinition/method-Resolve-12 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## yuiThemeDefinition.ValidationIssue

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

Verification: type checked

```yh
using ui

// Validation issue.
yuiThemeDefinition instance = yuiThemeDefinition("id", "display Name", "mode", "example")
text result = instance.ValidationIssue()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.ui__yuithemedefinition"
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--yuiThemeDefinition/method-ValidationIssue-13 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## yuiThemeDefinition.ComputeValidationIssue

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

Verification: type checked

```yh
using ui

// Compute validation issue.
yuiThemeDefinition instance = yuiThemeDefinition("id", "display Name", "mode", "example")
text result = instance.ComputeValidationIssue()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.ui__yuithemedefinition"
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--yuiThemeDefinition/method-ComputeValidationIssue-14 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## yuiThemeDefinition.RenderReport

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

Verification: type checked

```yh
using ui

// Render report.
yuiThemeDefinition instance = yuiThemeDefinition("id", "display Name", "mode", "example")
text result = instance.RenderReport()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.ui__yuithemedefinition"
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--yuiThemeDefinition/method-RenderReport-15 --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/visual-10-theme.yh

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