On 1/7/08, Phil Thompson <[EMAIL PROTECTED]> wrote: > > On Monday 07 January 2008, Arve Knudsen wrote: > > Hello > > > > I've run into what looks like a bug in PyQt. When changing the font of a > > QLabel at runtime, it doesn't update its appearance unless I call its > > update() method. I've verified that this problem doesn't occur when > using > > Qt directly from C++. Even after calling update(), something isn't right > > however, as the containing QGridLayout isn't adjusted to account for the > > label's changed dimensions. > > > > The attached program showcases the problem. Uncomment line 20 to see the > > layout problem. > > Change the first line of changeFont() to... > > f = QFont(self.__lab.font()) > > ...so that it is closer to what C++ would do.
Ah, this semantic detail escaped me. The typical C++ way is to say QFont f = label.font() . What I didn't notice however is that this makes a copy of the returned reference. SIP doesn't enforce "const". I've been mulling over this for a while. SIP > could enforce "const" so that the call to setBold() would raise an > exception. > The disadvantage is that existing apps may break - but, then again, they > are > broken anyway. An alternative might be to automatically make a copy under the covers so > that > wrapped C++ instances are never const. > A soft warning (as opposed to an exception) is perhaps also a third alterantive, so that the programmer knows he's doing something wrong? Thanks, Arve
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