DawnLauncher/src/main/mouse.js

"use strict";
const { EventEmitter } = require("events");
let paused = true;

class MouseEvents extends EventEmitter {
  constructor() {
    super();
    if (require("os").platform() !== "win32") return;
    let createdListener = false;
    let registeredEvents = [];
    this.on("newListener", (event) => {
      if (registeredEvents.indexOf(event) !== -1) return;
      // Enable WM_MOUSEMOVE capture if requested
      if (event === "mousemove") {
        global.api.enableMouseMove();
      }
      if ((event === "mouseup" || event === "mousedown" || event === "mousemove" || event === "mousewheel") && !createdListener) {
        // Careful: this currently "leaks" a thread every time it's called.
        // We should probably get around to fixing that.
        createdListener = global.api.createMouseHook((event, x, y, button, delta) => {
          const payload = { x, y };
          if (event === "mousewheel") {
            payload.delta = FromInt32(delta) / 120;
            payload.axis = button;
          } else if (event === "mousedown" || event === "mouseup") {
            payload.button = button;
          }
          this.emit(event, payload);
        });
        if (createdListener) {
          this.resumeMouseEvents();
        }
      } else {
        return;
      }
      registeredEvents.push(event);
    });
    this.on("removeListener", (event) => {
      if (this.listenerCount(event) > 0) return;
      registeredEvents = registeredEvents.filter((x) => x !== event);
      if (event === "mousemove") {
        global.api.disableMouseMove();
      }
    });
  }
  getPaused() {
    return paused;
  }
  pauseMouseEvents() {
    if (paused) return false;
    paused = true;
    return global.api.pauseMouseEvents();
  }
  resumeMouseEvents() {
    if (!paused) return false;
    paused = false;
    return global.api.resumeMouseEvents();
  }
}

function FromInt32(x) {
  var uint32 = x - Math.floor(x / 4294967296) * 4294967296;
  if (uint32 >= 2147483648) {
    return (uint32 - 4294967296) / 65536;
  } else {
    return uint32 / 65536;
  }
}

module.exports = new MouseEvents();