In case anyone else encounters this, I've filed a bug report on this issue at https://bugreports.qt-project.org/browse/QTBUG-25951
On Thu, May 24, 2012 at 1:52 PM, Adam Light <acli...@gmail.com> wrote: > In my application, I wish to handle tiff clipboard data (of UTI type > public.tiff) different than the implementation in QMacPasteboardMimeTiff (I > don't want the data to pass through a QImage). > > I have written my own subclass of QMacPasteboardMime that does exactly > what I want, and it works correctly. > > The documentation of QMacPasteboardMime (http://qt-project.org/doc/qt-4.8/ > qmacpasteboardmime.html) states: > "When working with MIME data, Qt will interate through all instances of > QMacPasteboardMime to find an instance that can convert to, or from, a > specific MIME type. It will do this by calling canConvert() on each > instance, starting with (and choosing) the last created instance first. The > actual conversions will be done by using convertToMime() > and convertFromMime()." > > I am instantiating my subclass of QMacPasteboardMime (call it > MyMacPasteboardMimeTiff) after my application's QApplication object is > created (the base QMacPasteboardMime class is created in the QApplication > initialization code). > > My problem is that my MyMacPasteboardMimeTiff::mimeFor(), canConvert(), > etc. methods never get called. This is because > QMacPasteboardMime::flavorToMime(), > which gets called when QMimeData::formats() is called, uses this code: > > QString QMacPasteboardMime::flavorToMime(uchar t, QString flav) > > { > > MimeList *mimes = globalMimeList(); > > for(MimeList::const_iterator it = mimes->constBegin(); it != > mimes->constEnd(); ++it) { > > #ifdef DEBUG_MIME_MAPS > > qDebug("QMacMIme::flavorToMime: attempting %s (%d) for flavor > %d[%c%c%c%c] [%s]", > > (*it)->convertorName().toLatin1().constData(), > > (*it)->type & t, flav, (flav >> 24) & 0xFF, (flav >> 16) & > 0xFF, (flav >> 8) & 0xFF, (flav) & 0xFF, > > (*it)->mimeFor(flav).toLatin1().constData()); > > > #endif > > if((*it)->type & t) { > > QString mimeType = (*it)->mimeFor(flav); > > if(!mimeType.isNull()) > > return mimeType; > > } > > } > > return QString(); > > } > > > So contrary to what the documentation > states/implies, QMacPasteboardMimeTiff::mimeFor() ends up getting called > before MyMacPasteboardMimeTiff::mimeFor() gets called. > Since QMacPasteboardMimeTiff supports the public.tiff UTI, it ends up being > used to do the conversion from the clipboard's data to MIME data. >
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