How to catch Ctrl+C on a widget?
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[quote author="kibsoft" date="1281701124"]I have tried keyBindings function and it returns Ctrl+C and Ctrl+Ins. Milot Shala, I did it, but the result was the same as with eventFilter :(
P.S. In headerview Ctrl+C works, but Ctrl+Ins doesn't works. I don't understand what is it..[/quote]
Where are you overriding the keyPressEvent virtual method?
I modified mine when I press Ctrl+C to set the Window title to currently selected tree view node such as in picture below (I am using QFileSystemModel):
!http://web7.twitpic.com/img/144954784-8f19fe179f40f269283c021d8028ac42.4c6541d0-full.png(window)!
and the code is almost the same:
@void MainWindow::keyPressEvent(QKeyEvent *e) {
if(e->type() == QKeyEvent::KeyPress) {
if(e->matches(QKeySequence::Copy)) {
QString a = ui->treeView->currentIndex().model()->data(ui->treeView->currentIndex()).toString();
setWindowTitle(a);
e->accept();
}
}
QMainWindow::keyPressEvent(e);
}@ -
You are welcome kibsoft :)
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bq. KeyEvent’s modifiers() returns Qt::ControlModifier and key() returns Qt::Key_Control when I push Ctrl+C..It is so strange..
Just in case anyone finds this old post in a search (as I did), probably what confused kibsoft was that a keyPressEvent handler gets multiple events for a multi-key input. When the user hits control-x, the handler sees the above code meaning "control was pressed". Then immediately after comes another event with ControlModifier set and a key value of x.
If the input is ctl-alt-x, then you would see three events as the user mashes the keys. This is why to test the event with matches() and ignore all that don't match.
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I stumbled on this topic doing a google search about how to catch Ctrl-c on a gui app (for instance a gui program simulating a Ctrl-c interrupt like a terminal emulater), and after doing some research came up with this for Qt5 which is a bit different because Ctrl-c on a Mac is not equal to: event->matches(QKeySequence::Copy).
If you are simulating a standard "Copy" content key (like word processor/text editor cut/copy/paste) combo then do indeed use event->matches(QKeySequence::Copy) but if you are trying to detect an actual Ctrl-c (like Ctrl-c terminal program interrupt) and you want something portable between Mac OS and something else (tested on both Mac OS High Sierra and Linux/Ubuntu 18.04):
// Respond to Ctrl-c: void SomeWidget::keyPressEvent(QKeyEvent *event) { // the MetaModifier is actually the control button on Mac OS X (at least on recent Mac OSes. Tested on High Sierra) #ifdef Q_OS_MAC // if compiling on Mac OS... if (event->key()==Qt::Key_C && (QGuiApplication::keyboardModifiers() & Qt::MetaModifier)) #else // If compiling on Linux (tested on Ubuntu 18.04), Windows, everything else... if (event->key()==Qt::Key_C && (QGuiApplication::keyboardModifiers() & Qt::ControlModifier)) #endif { // Ctrl-c hit, do something here to process the key combo } }