[mobile] added UI Themes controller

apps/common/mobile/lib/controller/Themes.js

@@ -0,0 +1,48 @@
+import { Dom7 } from 'framework7'
+import { LocalStorage } from "../../utils/LocalStorage";
+
+class ThemesController {
+    constructor() {
+        this.themes_map = {
+            dark : {
+                id: 'theme-dark',
+                type:'dark'
+            },
+            light: {
+                id: 'theme-light',
+                type: 'light'
+            }};
+
+        const obj = LocalStorage.getItem("ui-theme");
+        let theme = this.themes_map.light;
+        if ( !!obj )
+            theme = this.themes_map[JSON.parse(obj).type];
+        else
+        if ( window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches ) {
+            theme = this.themes_map['dark'];
+            LocalStorage.setItem("ui-theme", JSON.stringify(theme));
+        }
+
+        const $$ = Dom7;
+        const $body = $$('body');
+        $body.attr('class') && $body.attr('class',  $body.attr('class').replace(/\s?theme-type-(?:dark|light)/, ''));
+        $body.addClass(`theme-type-${theme.type}`);
+    }
+
+    get isCurrentDark() {
+        const obj = LocalStorage.getItem("ui-theme");
+        return !!obj ? JSON.parse(obj).type === 'dark' : false;
+    }
+
+    switchDarkTheme(dark) {
+        const theme = this.themes_map[dark ? 'dark' : 'light'];
+        LocalStorage.setItem("ui-theme", JSON.stringify(theme));
+
+        const $body = $$('body');
+        $body.attr('class') && $body.attr('class',  $body.attr('class').replace(/\s?theme-type-(?:dark|light)/, ''));
+        $body.addClass(`theme-type-${theme.type}`);
+    }
+}
+
+const themes = new ThemesController()
+export {themes as Themes}