refactor: 删除 getPreferredTheme 方法

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Components/Pre.razor.js

@@ -1,4 +1,4 @@
-import { copy, getDescribedElement, addLink, removeLink, addScript, getHeight, getPreferredTheme, registerBootstrapBlazorModule } from "../../_content/BootstrapBlazor/modules/utility.js"
+import { copy, getDescribedElement, addLink, removeLink, addScript, getHeight, getTheme, registerBootstrapBlazorModule } from "../../_content/BootstrapBlazor/modules/utility.js"
 import EventHandler from "../../_content/BootstrapBlazor/modules/event-handler.js"
 
 export async function init(id, title, assetRoot) {
@@ -9,7 +9,7 @@ export async function init(id, title, assetRoot) {
 
     await addScript(`${assetRoot}lib/highlight/highlight.min.js`)
     await addScript(`${assetRoot}lib/highlight/cshtml-razor.min.js`)
-    await switchTheme(getPreferredTheme(), assetRoot);
+    await switchTheme(getTheme(), assetRoot);
 
     const preElement = el.querySelector('pre')
     const code = el.querySelector('pre > code')

src/BootstrapBlazor.Server/Components/Layout/BaseLayout.razor.js

@@ -1,6 +1,6 @@
-import { getPreferredTheme, setTheme } from "../../_content/BootstrapBlazor/modules/utility.js"
+import { getTheme, setTheme } from "../../_content/BootstrapBlazor/modules/utility.js"
 
 export function initTheme() {
-    const currentTheme = getPreferredTheme();
+    const currentTheme = getTheme();
     setTheme(currentTheme, false);
 }

src/BootstrapBlazor/Components/ThemeProvider/ThemeProvider.razor.js

@@ -1,4 +1,4 @@
-import { getPreferredTheme, setTheme, switchTheme, calcCenterPosition } from "../../modules/utility.js"
+import { getTheme, setTheme, switchTheme, calcCenterPosition } from "../../modules/utility.js"
 import EventHandler from "../../modules/event-handler.js"
 import Data from "../../modules/data.js"
 
@@ -17,7 +17,7 @@ export function init(id, invoke, themeValue, callback) {
 
     let currentTheme = themeValue;
     if (currentTheme === 'useLocalStorage') {
-        currentTheme = getPreferredTheme();
+        currentTheme = getTheme();
     }
     setTheme(currentTheme, true);
     theme.currentTheme = currentTheme;

src/BootstrapBlazor/wwwroot/modules/utility.js

@@ -716,18 +716,8 @@ export function getHtml(options) {
     return html;
 }
 
-
-export function getPreferredTheme() {
-    const storedTheme = getTheme()
-    if (storedTheme) {
-        return storedTheme
-    }
-
-    return getAutoThemeValue();
-}
-
 export function getTheme() {
-    return localStorage.getItem('theme') || document.documentElement.getAttribute('data-bs-theme') || 'light';
+    return localStorage.getItem('theme') || document.documentElement.getAttribute('data-bs-theme') || getAutoThemeValue();
 }
 
 export function saveTheme(theme) {