feat: add battery module

src/index.ts

@@ -1,3 +1,4 @@
+import { Battery } from './modules/battery';
 import { FileStorage } from './modules/fileStorage';
 import { LocalStorage } from './modules/localStorage';
 import { Volume } from './modules/volume';
@@ -6,4 +7,5 @@ export class KaiOS {
   static Volume = Volume;
   static LocalStorage = LocalStorage;
   static FileStorage = FileStorage;
+  static Battery = Battery;
 }

src/models/Battery.ts

@@ -3,6 +3,7 @@ export type Battery = {
   level: number;
   temperature: number;
   onlevelchange: () => void;
+  onchargingchange: () => void;
   addEventListener: (event: string, cb: () => void) => void;
   removeEventListener: (event: string, cb: () => void) => void;
 };

src/models/CallbackFn.ts

@@ -0,0 +1 @@
+export type CallbackFn<T = never> = ((data?: T) => void) | null;

src/models/index.ts

@@ -1,4 +1,5 @@
 export * from './Battery';
+export * from './CallbackFn';
 export * from './Connection';
 export * from './DomApplication';
 export * from './FileSearchResult';

src/modules/battery.ts

@@ -0,0 +1,42 @@
+import { CallbackFn } from '../models';
+import { Navigator } from './navigator';
+
+type Options = {
+  subscribeToChanges: boolean;
+};
+
+export class Battery {
+  charging: boolean = false;
+  level: number = 0;
+  temperature: number = 0;
+
+  constructor(options?: Partial<Options>) {
+    const opts: Options = {
+      subscribeToChanges: true,
+    };
+
+    this.updateStatus();
+
+    Navigator.navigator.battery.onlevelchange = () => {
+      if (opts.subscribeToChanges) {
+        this.updateStatus();
+      }
+      this.onLevelChange?.(Navigator.navigator.battery.level);
+    };
+    Navigator.navigator.battery.onchargingchange = () => {
+      if (opts.subscribeToChanges) {
+        this.updateStatus();
+      }
+      this.onChargingChange?.(Navigator.navigator.battery.charging);
+    };
+  }
+
+  onLevelChange: CallbackFn<number> = null;
+  onChargingChange: CallbackFn<boolean> = null;
+
+  private updateStatus() {
+    this.charging = Navigator.navigator.battery.charging;
+    this.level = Navigator.navigator.battery.level;
+    this.temperature = Navigator.navigator.battery.temperature;
+  }
+}