@applicaster/zapp-react-native-utils/appUtils/keyInputHandler/KeyInputHandler.ts

Applicaster Zapp React Native utilities package

export type SeekKeyHandlerListener = {
  onRewindPress: () => boolean;
  onForwardPress: () => boolean;
  onRewindPressOut: () => void;
  onForwardPressOut: () => void;
};

export class KeyInputHandler {
  private static instance: KeyInputHandler;

  public static getInstance() {
    if (!KeyInputHandler.instance) {
      KeyInputHandler.instance = new KeyInputHandler();
    }

    return KeyInputHandler.instance;
  }

  constructor() {
    this.listeners = [];
  }

  private listeners: SeekKeyHandlerListener[] = [];

  addListener = (listener: SeekKeyHandlerListener) => {
    this.listeners.splice(0, 0, listener);

    return () => this.removeListener(listener);
  };

  removeListener = (listener: SeekKeyHandlerListener) => {
    this.listeners = this.listeners.filter((l) => l !== listener);
  };

  onRewindPress = () => {
    for (const element of this.listeners) {
      if (element.onRewindPress()) {
        break;
      }
    }
  };

  onForwardPress = () => {
    for (const element of this.listeners) {
      if (element.onForwardPress()) {
        break;
      }
    }
  };

  // TODO: Event should be send to listeners who handled down event
  onRewindPressOut = () => {
    this.listeners.forEach((listener) => listener.onRewindPressOut());
  };

  onForwardPressOut = () => {
    this.listeners.forEach((listener) => listener.onForwardPressOut());
  };

  getSeekMethods = () => {
    return {
      onForwardPress: this.onForwardPress,
      onRewindPress: this.onRewindPress,
      onForwardPressOut: this.onForwardPressOut,
      onRewindPressOut: this.onRewindPressOut,
    };
  };
}