# ThemeService

- File ID: file:i1pwrm:themeservice-cs
- Path: NexusReader.UI.Shared/Services/ThemeService.cs
- Role: service
- Layer: frontend

## Purpose

A small UI-shared service that tracks and toggles light/dark theme state and notifies subscribers when the theme changes.

## Key Details

Single-purpose service: toggles a boolean and awaits an optional async event handler to notify UI components about theme changes.

## Symbols

- ThemeService: A small UI-shared service that tracks and toggles light/dark theme state and notifies subscribers when the theme changes.
- ToggleTheme(): Toggles the IsLightMode flag and notifies subscribers via the OnThemeChanged event.
- ThemeService: Service that holds theme state and exposes an event to notify consumers when the theme changes.

## Dependencies

- No resolved dependencies.

## Calls

- No resolved calls.

## Unresolved References

- dependency-target: unknown (IThemeService referenced but implementation/interface file not in this snippet)
- call-target: self

## Coverage

- Symbols: 3
- Executable symbols: 1
- Executable symbols with control flow: 1
- Grounded edges: 3
- Unresolved references: 2
- Control-flow fragments: 1
- Unresolved jumps: 1
- Unsupported constructs: 0
- Control-flow coverage: 100%
- Required diagrams: 2
- Generated diagrams: 3

## Control Flow Fragments

- ToggleTheme: 14 nodes, 15 edges, 1 jumps, 0 unsupported constructs

## Diagrams

### ThemeService Neighborhood

```mermaid
flowchart LR
    class_1ehqpz0_themeservice("ThemeService")
    file_i1pwrm_themeservice_cs("ThemeService")
    method_1fcqnzv_toggletheme[["ToggleTheme()"]]
    type_1mmobgz_themeservice[/"ThemeService"/]
```

### ThemeService Execution Overview

```mermaid
flowchart TD
    class_1ehqpz0_themeservice("ThemeService")
    method_1fcqnzv_toggletheme[["ToggleTheme()"]]
    unresolved_unresolved_v3fr6i_call_target{"Unresolved: OnThemeChanged"}
    class_1ehqpz0_themeservice -->|contains| method_1fcqnzv_toggletheme
    method_1fcqnzv_toggletheme -->|unresolved call| unresolved_unresolved_v3fr6i_call_target
```

### ToggleTheme() Control Flow

```mermaid
flowchart TD
    method_1fcqnzv_toggletheme__call_11_OnThemeChanged[["OnThemeChanged"]]
    method_1fcqnzv_toggletheme__action_10_state_mutation_10__linear("Toggle IsLightMode")
    method_1fcqnzv_toggletheme__action_11_event_invoke_11__linear("Notify theme change subscribers")
    method_1fcqnzv_toggletheme__action_11_guard_clause_11__condition{"OnThemeChanged != null"}
    method_1fcqnzv_toggletheme__action_11_guard_clause_11__false("invoke-subscribers")
    method_1fcqnzv_toggletheme__action_11_guard_clause_11__merge("merge")
    method_1fcqnzv_toggletheme__action_11_guard_clause_11__true("no-subscribers")
    method_1fcqnzv_toggletheme__action_11_toggletheme_await_11_1__await[["Waits for async work"]]
    method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__condition{"OnThemeChanged != null) await OnThemeChanged("}
    method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__false("false")
    method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__merge("merge")
    method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__true("true")
    method_1fcqnzv_toggletheme__entry(["ToggleTheme entry"])
    method_1fcqnzv_toggletheme__implicit_return(["return"])
    method_1fcqnzv_toggletheme__action_10_state_mutation_10__linear -->|next| method_1fcqnzv_toggletheme__action_11_toggletheme_await_11_1__await
    method_1fcqnzv_toggletheme__action_11_event_invoke_11__linear -->|next| method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__condition
    method_1fcqnzv_toggletheme__action_11_guard_clause_11__condition -->|invoke-subscribers| method_1fcqnzv_toggletheme__action_11_guard_clause_11__false
    method_1fcqnzv_toggletheme__action_11_guard_clause_11__condition -->|no-subscribers| method_1fcqnzv_toggletheme__action_11_guard_clause_11__true
    method_1fcqnzv_toggletheme__action_11_guard_clause_11__false -->|next| method_1fcqnzv_toggletheme__action_11_guard_clause_11__merge
    method_1fcqnzv_toggletheme__action_11_guard_clause_11__merge -->|no params awaits the invoked Task returned by subscribers| method_1fcqnzv_toggletheme__call_11_OnThemeChanged
    method_1fcqnzv_toggletheme__action_11_guard_clause_11__true -->|next| method_1fcqnzv_toggletheme__action_11_guard_clause_11__merge
    method_1fcqnzv_toggletheme__action_11_toggletheme_await_11_1__await -->|next| method_1fcqnzv_toggletheme__action_11_event_invoke_11__linear
    method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__condition -->|false| method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__false
    method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__condition -->|true| method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__true
    method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__false -->|next| method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__merge
    method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__merge -->|next| method_1fcqnzv_toggletheme__action_11_guard_clause_11__condition
    method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__true -->|next| method_1fcqnzv_toggletheme__action_11_toggletheme_branch_11_0__merge
    method_1fcqnzv_toggletheme__call_11_OnThemeChanged -->|return| method_1fcqnzv_toggletheme__implicit_return
    method_1fcqnzv_toggletheme__entry -->|next| method_1fcqnzv_toggletheme__action_10_state_mutation_10__linear
```

## Diagram Validation

- Status: warn
- Warning: Control-flow extraction left 1 unresolved jumps.
