How to Run an event (keypressevent) in the background ?

[saulad]

I need to be checking the keyboard input for a bar-code-reader (this machine works like a keyboard, typing the code and an "enter" at the end). But I can't keep the parent widget always in front. So, how can I keep the keyPressEvent running?

I found out that QEventLoop may helps, but I don't know how to use it in my constructor. There are not many examples in the Internet.

Thanks for your help.

@class monitor : public QWidget
{
Q_OBJECT

public:
explicit monitor(QWidget *parent = 0);
~monitor();
char code[8];
void keyPressEvent(QKeyEvent *e);
QEventLoop loop;

private:
Ui::monitor *ui;
};@

[JKSH]

Hi,

Try http://stackoverflow.com/questions/2035310/how-can-i-simulate-user-interaction-key-press-event-in-qt

(You don't create your own event loop in your class. QApplication::exec() creates the event loop in the main() function)

[NicuPopescu]

Hi,

first, the title and the content are misleading somehow as they suggest different things: the title request for a "run" as a code generated key press event and the solution is as JKSH hinted, and the content request for a silent key input checking solution :)

for checking the keyboard input silently I use to grab the keyboard input(by grabKeyboard() method ) to a defined widget(QPushButton or whatever) - by this you avoid to check for any sender , and install an event filter for it to fetch key press events

hope this helps!

Cheers!