refactor: Pages folder structure

lib/pages/settings_style/settings_style.dart

@@ -0,0 +1,65 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+
+import 'package:adaptive_theme/adaptive_theme.dart';
+import 'package:file_picker_cross/file_picker_cross.dart';
+
+import 'package:fluffychat/config/app_config.dart';
+import 'package:fluffychat/config/setting_keys.dart';
+import '../../widgets/matrix.dart';
+import 'settings_style_view.dart';
+
+class SettingsStyle extends StatefulWidget {
+  const SettingsStyle({Key key}) : super(key: key);
+
+  @override
+  SettingsStyleController createState() => SettingsStyleController();
+}
+
+class SettingsStyleController extends State<SettingsStyle> {
+  void setWallpaperAction() async {
+    final wallpaper =
+        await FilePickerCross.importFromStorage(type: FileTypeCross.image);
+    if (wallpaper == null) return;
+    Matrix.of(context).wallpaper = File(wallpaper.path);
+    await Matrix.of(context)
+        .store
+        .setItem(SettingKeys.wallpaper, wallpaper.path);
+    setState(() => null);
+  }
+
+  void deleteWallpaperAction() async {
+    Matrix.of(context).wallpaper = null;
+    await Matrix.of(context).store.deleteItem(SettingKeys.wallpaper);
+    setState(() => null);
+  }
+
+  AdaptiveThemeMode currentTheme;
+
+  void switchTheme(AdaptiveThemeMode newTheme) {
+    switch (newTheme) {
+      case AdaptiveThemeMode.light:
+        AdaptiveTheme.of(context).setLight();
+        break;
+      case AdaptiveThemeMode.dark:
+        AdaptiveTheme.of(context).setDark();
+        break;
+      case AdaptiveThemeMode.system:
+        AdaptiveTheme.of(context).setSystem();
+        break;
+    }
+    setState(() => currentTheme = newTheme);
+  }
+
+  void changeFontSizeFactor(double d) {
+    setState(() => AppConfig.fontSizeFactor = d);
+    Matrix.of(context).store.setItem(
+          SettingKeys.fontSizeFactor,
+          AppConfig.fontSizeFactor.toString(),
+        );
+  }
+
+  @override
+  Widget build(BuildContext context) => SettingsStyleView(this);
+}