electron/lib/browser/api/screen.ts

49 lines
1.5 KiB
TypeScript

import { EventEmitter } from 'events';
const { createScreen } = process._linkedBinding('electron_browser_screen');
let _screen: Electron.Screen;
const createScreenIfNeeded = () => {
if (_screen === undefined) {
_screen = createScreen();
}
};
// We can't call createScreen until after app.on('ready'), but this module
// exposes an instance created by createScreen. In order to avoid
// side-effecting and calling createScreen upon import of this module, instead
// we export a proxy which lazily calls createScreen on first access.
export default new Proxy({}, {
get: (target, property: keyof Electron.Screen) => {
createScreenIfNeeded();
const value = _screen[property];
if (typeof value === 'function') {
return value.bind(_screen);
}
return value;
},
set: (target, property: string, value: unknown) => {
createScreenIfNeeded();
return Reflect.set(_screen, property, value);
},
ownKeys: () => {
createScreenIfNeeded();
return Reflect.ownKeys(_screen);
},
has: (target, property: string) => {
createScreenIfNeeded();
return property in _screen;
},
getOwnPropertyDescriptor: (target, property: string) => {
createScreenIfNeeded();
return Reflect.getOwnPropertyDescriptor(_screen, property);
},
getPrototypeOf: () => {
// This is necessary as a result of weirdness with EventEmitterMixin
// and FunctionTemplate - we need to explicitly ensure it's returned
// in the prototype.
return EventEmitter.prototype;
}
});