ng-thermal-print
Version:
An angular module to add thermal printing capabilities.
65 lines • 9.02 kB
JavaScript
import { __awaiter } from "tslib";
import { BehaviorSubject, Observable } from 'rxjs';
import { PrintDriver } from "./PrintDriver";
export class UsbDriver extends PrintDriver {
constructor(vendorId, productId) {
super();
this.isConnected = new BehaviorSubject(false);
this.vendorId = vendorId;
this.productId = productId;
}
connect() {
navigator.usb.getDevices().then(devices => {
this.device = devices.find((device) => {
return device.vendorId === this.vendorId && device.productId === this.productId;
});
console.log(this.device);
return this.device.open();
})
.then(() => {
let result = this.device.selectConfiguration(1);
return result;
})
.then(() => {
let result = this.device.claimInterface(0);
return result;
}).then(result => {
const endPoints = this.device.configuration.interfaces[0].alternate.endpoints;
this.endPoint = endPoints.find((endPoint) => endPoint.direction === 'out');
this.isConnected.next(true);
this.listenForUsbConnections();
}).catch(result => {
this.isConnected.next(false);
});
}
/**
* Request a USB device through the browser
* return Observable<USBDevice>
*/
requestUsb() {
return new Observable(observer => {
navigator.usb.requestDevice({ filters: [] })
.then((result) => {
this.vendorId = result.vendorId;
this.productId = result.productId;
return observer.next(result);
}).catch(error => {
return observer.error(error);
});
});
}
write(data) {
return __awaiter(this, void 0, void 0, function* () {
this.device.transferOut(this.endPoint.endpointNumber, data);
});
}
listenForUsbConnections() {
navigator.usb.addEventListener('disconnect', () => {
this.isConnected.next(false);
});
navigator.usb.addEventListener('connect', () => {
this.isConnected.next(true);
});
}
}
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