Tim-
On Macintosh, cmd-. is the cancel signal, like ctrl-break in Windows, or Ctrl-C
for Linux. In fact, when building with Qt and Cocoa, you don't get it at all
because Cocoa eats it up. We went to somewhat extreme lengths to intercept
cmd-. so that we can use it to cancel user programs (our application includes a
user programming language).
You really should NOT use cmd-. as anything other than a cancel signal.
Here is what we did to get access to cmd-. key events:
In a .mm file:
bool WMNSEventIsCmdPeriodKeyDown(void * event)
{
NSEvent * nsevent = reinterpret_cast<NSEvent *>(event);
if ([nsevent type] == NSKeyDown)
{
if ([nsevent modifierFlags] & NSCommandKeyMask)
{
NSString * chars = [nsevent
charactersIgnoringModifiers];
return [chars characterAtIndex:0] == 0x2E;
// Unicode encoding for period
}
}
return false;
}
bool WMNSEventIsCmdPeriodKeyUp(void * event)
{
NSEvent * nsevent = reinterpret_cast<NSEvent *>(event);
if ([nsevent type] == NSKeyUp)
{
if ([nsevent modifierFlags] & NSCommandKeyMask)
{
NSString * chars = [nsevent
charactersIgnoringModifiers];
return [chars characterAtIndex:0] == 0x2E;
}
}
return false;
}
Then, with Qt 5, we define a macintosh event filter class:
class macEventFilterClass : public QObject, public
QAbstractNativeEventFilter
{
Q_OBJECT
public:
bool
nativeEventFilter(const QByteArray&, void* message, long*);
signals:
void
caughtCancelEvent(bool isDown);
};
bool macEventFilterClass::nativeEventFilter(const QByteArray &, void *
message, long *)
{
bool result = false;
if (WMNSEventIsCmdPeriodKeyDown(reinterpret_cast<void *>(message)))
{
emit caughtCancelEvent(true);
result = true;
}
else if (WMNSEventIsCmdPeriodKeyUp(reinterpret_cast<void *>(message)))
{
emit caughtCancelEvent(false);
result = true;
}
return result;
}
and in our QApplication-derived class constructor, we install it on the
application:
_macEventFilterObject = new macEventFilterClass;
connect(_macEventFilterObject,
SIGNAL(caughtCancelEvent(bool)), this, SLOT(_caughtMacCancelEvent(bool)));
installNativeEventFilter(_macEventFilterObject);
On Sep 3, 2014, at 2:38 PM, Tim Blechmann <t...@klingt.org> wrote:
> hi all,
>
> i wonder, does ctrl-. (as in cmd-.) have any special treatment in qt5?
> i'd like to use it a shortcut of an action which is available from the
> menu bar, but it does not get triggered. otoh, in QFileDialog and the
> like get seem to trigger the "cancel" button.
>
> any idea how use it for application-defined shortcuts?
>
> thnx,
> tim
>
> _______________________________________________
> Interest mailing list
> Interest@qt-project.org
> http://lists.qt-project.org/mailman/listinfo/interest
Regards,
John Weeks
WaveMetrics, Inc.
Phone (503) 620-3001
Fax (503) 620-6754
email supp...@wavemetrics.com
_______________________________________________
Interest mailing list
Interest@qt-project.org
http://lists.qt-project.org/mailman/listinfo/interest
