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167 lines
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<title>Language Selection SubMenu | HiAPI-C# 2025 </title>
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<article data-uid="Anatomy-LanguageSelectionSubmenu">
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<h1 id="language-selection-submenu">Language Selection SubMenu</h1>
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<p>The submenu locates on the <a class="xref" href="preference-menu.html">Preference Menu Dropdown</a>. It is the only
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place the application offers for changing the interface language. What that choice sets in motion —
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the message bundles, the locale applied before the first frame, the single switch
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function and everything that re-renders behind it — is
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<a class="xref" href="../platform/i18n.html">Internationalization</a>; this page covers the gesture.</p>
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<p>The submenu's model is the application-state store rather than a service handed down by the
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parent component: it reads the current code and the available-code list from that store and calls
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the store's language action. Both values are hydrated by the store's server-preferences load, which
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the shell layout runs on mount — a separate path from the one that decides which locale the first
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painted frame uses.</p>
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<h2 id="layout">Layout</h2>
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<ul>
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<li><p>Language Selection SubMenu</p>
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<ul>
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<li>Language Row — one plain row per code in the store's available-code list, so the rows are
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whatever the server reports rather than a fixed set of three. Each carries the language's own
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name from a hard-coded label map, falling back to the raw code for anything the map does not
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name, with that code beneath it as a caption; the row matching the current language is drawn in
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the active state. No row carries a radio button or a checkbox.</li>
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</ul>
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<p>The parent entry captions the current language, so it reads without opening the submenu.</p>
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</li>
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</ul>
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<p>Choosing a row closes the popup and makes one call, the store's language action.
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The store writes the new code optimistically, POSTs it, adopts the current and available lists the
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server echoes back, and only then switches the live catalogue — so the interface text flips after
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the server has accepted the value, and the confirmation toast already reads in the language just
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picked. A rejected write rolls the store back and changes no interface text at all.</p>
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<h2 id="source-code-path">Source Code Path</h2>
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<p>See <a class="xref" href="../index.html">HiNC App Anatomy</a> for git repository links.</p>
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<h3 id="web-application">Web Application</h3>
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<p>HiNC-2025-webservice (Quasar CLI SPA):</p>
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<ul>
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<li><code>wwwroot-src/src/components/AppMenuBar.vue</code> — the nested <code>Preference → Language ▸</code> popup: the row
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loop over the available codes, the hard-coded self-name map, the active-row marker, and the
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handler whose single call is the store's language action.</li>
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<li><code>wwwroot-src/src/stores/appState.ts</code> — the current-code and available-code state, the language
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action with its optimistic write, its POST-then-apply order and its rollback, and the
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server-preferences load the shell layout runs on mount.</li>
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<li><code>wwwroot-src/src/api/preference.ts</code> — the typed wrappers over the two language endpoints.</li>
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<li><code>Environments/PreferenceController.cs</code> — <code>GET /api/preference/language</code> and its <code>POST</code> twin, both
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answering <code>success</code>, <code>current</code> and <code>available</code>; <code>languageCode</code> is the name of a field in the POST
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request body only. An unlisted code is rejected with 400, and an accepted one is written to the
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persisted <code>UserConfig.LanguageCode</code> and saved.</li>
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</ul>
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<h2 id="see-also">See Also</h2>
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<ul>
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<li><a class="xref" href="../conventions/translation-remarks.html">Translation Remarks</a> — the terminology every translated label is held to</li>
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<li><a class="xref" href="preference-menu.html">Preference Menu Dropdown</a> — the dropdown this sub-menu hangs from</li>
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<li><a class="xref" href="../platform/i18n.html">Internationalization</a> — the bundles and the switch point this menu drives</li>
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</ul>
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</article>
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