[Resolved] How can I set the focus on my application at startup

[code_fodder]

Hi There,

I am trying to start an app on linux (or even windows) that when run should have focus and hide the mouse. My program does this ok until I hide the mouse... when I hide the mouse the app no longer gets focus!

Here is the code:

@
#include <QApplication>
#include <QThread>
#include <stdlib.h>

int main(int argc, char *argv[])
{
// Create the app
QApplication app(argc, argv);

// Hide the pointer - IF I UN-COMMENT THIS I LOSE FOCUS AT STARTUP.
//app.setOverrideCursor( QCursor( Qt::BlankCursor ) );

// Create main window
MainWindow *window = new MainWindow;

// Set up the UI and execute the App
window->show();
app.exec();

// tidy up
delete(window);
return 0;

}
@

You can see my comment where if I un-comment my code to hide the mouse then when the app starts it does not have focus....

What do I need to do here?
Thanks

[BlastDV]

What if you just call the next code in your MainWindow constructor:
@setCursor(Qt::BlankCursor);@

I've just tested it and It worked fine, with no focus lost. Have you tried this already? :)

[code_fodder]

Hi There,

Yes, I did try something like this, but it did not work for me in all cases. It works if I make a PC app and run it on the PC, perhaps as you have done as well, but it somehow fails to work on my embedded touch screen app.

I am starting to figure that it may be a difference of the OS/Touchscreen.

I ended up having to use:
@
#include <QWSServer>
:
QApplication app(argc, argv);
QWSServer::setCursorVisible(false);
@
in main.cpp just after my app is created. I wanted to avoid bringing in more libraries, but I was un-able to get to the route of the cause :(

Still, this works nicely, seems to be a "more powerful" way of controlling the mouse (and other QWS things which I have not yet looked at).

[BlastDV]

I hope it solved your problem. Anyway, did you check the "Paint Touch" (or something like that) demo that comes with Qt 4.81? The're basically implementig a classic Paint for touch devices, I'm pretty sure there was no mouse in there, so you may want to look at it.