The QFileIconProvider class provides icons for QFileDialog to use.
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By default QFileIconProvider is not used, but any application or library can subclass it, reimplement pixmap() to return a suitable icon, and make all QFileDialog objects use it by calling the static function QFileDialog::setIconProvider().
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It is advisable to make all the icons that QFileIconProvider returns be the same size or at least the same width. This makes the list view look much better.
Returns a pointer to a pixmap that should be used to signify the file with the information \fIinfo\fR.
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If pixmap() returns 0, QFileDialog draws the default pixmap.
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The default implementation returns particular icons for files, directories, link-files and link-directories. It returns a blank "icon" for other types.
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If you return a pixmap here, it should measure 16x16 pixels.