How to Implement a Print Queue on Flutter? - flutter

Question

I´m using esc_pos_bluetooth 0.2.8 library and connect the printer by bluetooth
Is ok when I send one order at a time, but when there are simultaneous orders, it print just the first and ignore the others. I try implement a print queue but I was not successful.
List printQueue = [];
insertPrintQueue(Schema item) {
printQueue.add(item);
printTicket(printQueue[0]);
}
verifyPrintQueue() {
if (printQueue.length > 0) {
printTicket(printQueue[0]);
}
}
printTicket(Schema item) async {
if (printerDevices != null) {
printerManager.selectPrinter(printerDevices[0]);
await printerManager
.printTicket(await ticket.templateTicket(item))
.then((value) => {
printQueue.removeAt(0),
if (printQueue.length > 0)
{
printTicket(printQueue[0])
}
});
} else {
print("None Printer Found");
}
I think this is happening because I'm trying to print while the printer is busy, have a way to check the status of the printer? and just order the print when the printer is not printing

Answer 1

insertPrintQueue(Schema item) {
printQueue.add(item);
printTicket(printQueue[0]); // Here
}
You are trying to print the first item always. So it works as expected. You can do it like this:
insertPrintQueue(Schema item) {
printQueue.add(item);
//printTicket(printQueue[0]);
for (var ticket in printQueue) {
printTicket(ticket);
}
}