| QBitArray | Array of bits |
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| QBitmap | Monochrome (1-bit depth) pixmaps |
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| QBrush | Defines the fill pattern of shapes drawn by QPainter |
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| QByteArray | Array of bytes |
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| QCache | Template class that provides a cache |
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| QContiguousCache | Template class that provides a contiguous cache |
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| QCursor | Mouse cursor with an arbitrary shape |
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| QDir | Access to directory structures and their contents |
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| QFileInfo | System-independent file information |
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| QFont | Specifies a font used for drawing text |
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| QFontInfo | General information about fonts |
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| QFontMetrics | Font metrics information |
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| QFontMetricsF | Font metrics information |
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| QGLColormap | Used for installing custom colormaps into a QGLWidget |
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| QGradient | Used in combination with QBrush to specify gradient fills |
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| QHash | Template class that provides a hash-table-based dictionary |
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| QIcon | Scalable icons in different modes and states |
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| QImage | Hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device |
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| QKeySequence | Encapsulates a key sequence as used by shortcuts |
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| QLinkedList | Template class that provides linked lists |
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| QList | Template class that provides lists |
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| QLocale | Converts between numbers and their string representations in various languages |
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| QMap | Template class that provides a skip-list-based dictionary |
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| QMultiHash | Convenience QHash subclass that provides multi-valued hashes |
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| QMultiMap | Convenience QMap subclass that provides multi-valued maps |
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| QPainterPath | Container for painting operations, enabling graphical shapes to be constructed and reused |
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| QPalette | Contains color groups for each widget state |
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| QPen | Defines how a QPainter should draw lines and outlines of shapes |
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| QPicture | Paint device that records and replays QPainter commands |
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| QPixmap | Off-screen image representation that can be used as a paint device |
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| QPolygon | Vector of points using integer precision |
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| QPolygonF | Vector of points using floating point precision |
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| QQueue | Generic container that provides a queue |
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| QRegExp | Pattern matching using regular expressions |
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| QRegion | Specifies a clip region for a painter |
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| QSet | Template class that provides a hash-table-based set |
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| QSqlField | Manipulates the fields in SQL database tables and views |
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| QSqlQuery | Means of executing and manipulating SQL statements |
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| QSqlRecord | Encapsulates a database record |
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| QStack | Template class that provides a stack |
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| QString | Unicode character string |
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| QStringList | List of strings |
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| QTextBoundaryFinder | Way of finding Unicode text boundaries in a string |
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| QTextCursor | Offers an API to access and modify QTextDocuments |
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| QTextDocumentFragment | Represents a piece of formatted text from a QTextDocument |
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| QTextFormat | Formatting information for a QTextDocument |
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| QUrl | Convenient interface for working with URLs |
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| QVariant | Acts like a union for the most common Qt data types |
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| QVector | Template class that provides a dynamic array |
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| QX11Info | Information about the X display configuration |
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