QFontCombobox (Qt 4.7) missing fonts

I am developing a Qt application and i am using a QFontCombobox that must list all fonts,the application will be used by designers and they have a lot of fonts installed. I was notified that many fonts are missing in the combobox. I read the documentation and the comb开发者_如何学运维obox by default should load all fonts. I need a solution or at least some tips about why fonts could be missing and how could I load them. The application must be cross-platform so it would be better to avoid calling native libs if possible.

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You can use

QStringList QFontDatabase::families ( WritingSystem writingSystem = Any ) const

function to see what font families are recognized by Qt. If the list is somehow incomplete you can add fonts with

int QFontDatabase::addApplicationFont ( const QString & fileName ) [static]

function.

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The QFontCombobox does not display fonts but font families. See the Font Sampler example in qtdemo/Painting for how to enumerate all fonts in a tree.