Qt-interest Archive, March 2002
QComboBox sizeHint().width() is constant
Message 1 in thread
3.0.3 on Linux :
#include <qcombobox.h>
#include <qapplication.h>
#include <iostream>
int main( int argc, char **argv )
{
QApplication a( argc, argv );
QComboBox test( "blah" );
a.setMainWidget( &test);
test.show();
test.insertItem("a");
std::cerr << "width hint " << test.sizeHint().width() << std::endl;
test.insertItem("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
std::cerr << "width hint " << test.sizeHint().width() << std::endl;
return a.exec();
}
both return 85 on my box. This makes a readable, well-sized combo on a
toolbar impossible as far as I can see.
Is this a bug ? If not, why ?
regards
john
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[ signature omitted ]
Message 2 in thread
On Mon, 25 Mar 2002 23:47:03 +0000
John Levon <moz@compsoc.man.ac.uk> wrote:
> 3.0.3 on Linux :
>
>
> #include <qcombobox.h>
> #include <qapplication.h>
>
> #include <iostream>
>
> int main( int argc, char **argv )
> {
> QApplication a( argc, argv );
> QComboBox test( "blah" );
> a.setMainWidget( &test);
> test.show();
> test.insertItem("a"i, );
> std::cerr << "width hint " << test.sizeHint().width() <<
> std::endl; test.insertItem("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
> std::cerr << "width hint " << test.sizeHint().width() <<
> std::endl; return a.exec();
> }
>
> both return 85 on my box. This makes a readable, well-sized combo on a
> toolbar impossible as far as I can see.
>
> Is this a bug ? If not, why ?
I think the combobox size is only recomputed when it is shown : if you
move the test.show() statement after the second cerr and you will get a
much wider combobox.
Calling adjustSize() after the second insertItem does not seem to have any
effect either...
--
[ signature omitted ]
Message 3 in thread
On Tue, Mar 26, 2002 at 08:25:57AM +0000, Matthieu Dazy wrote:
> > Is this a bug ? If not, why ?
>
> I think the combobox size is only recomputed when it is shown : if you
> move the test.show() statement after the second cerr and you will get a
> much wider combobox.
You are correct, thanks for this workaround. Does anybody know /why/
it's like this ?
regards
john
--
[ signature omitted ]
Message 4 in thread
On Tue, Mar 26, 2002 at 05:17:02PM +0000, John Levon wrote:
> On Tue, Mar 26, 2002 at 08:25:57AM +0000, Matthieu Dazy wrote:
>
> > > Is this a bug ? If not, why ?
> >
> > I think the combobox size is only recomputed when it is shown : if you
> > move the test.show() statement after the second cerr and you will get a
> > much wider combobox.
>
> You are correct, thanks for this workaround. Does anybody know /why/
> it's like this ?
To make sizeHint() as fast as possible in the common case? :)
Simon
