These classes are useful classes not fitting into any other category.
| QDoubleValidator | Range checking of floating-point numbers |
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| QErrorMessage | Error message display dialog |
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| QExplicitlySharedDataPointer | Represents a pointer to an explicitly shared object |
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| QIntValidator | Validator that ensures a string contains a valid integer within a specified range |
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| QKeySequence | Encapsulates a key sequence as used by shortcuts |
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| QLibraryInfo | Information about the Qt library |
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| QMacPasteboardMime | Maps open-standard MIME to Mac flavors |
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| QProcess | Used to start external programs and to communicate with them |
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| QRegExp | Pattern matching using regular expressions |
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| QRegExpValidator | Used to check a string against a regular expression |
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| QRubberBand | Rectangle or line that can indicate a selection or a boundary |
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| QSettings | Persistent platform-independent application settings |
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| QSharedData | Base class for shared data objects |
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| QSharedDataPointer | Represents a pointer to an implicitly shared object |
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| QSplashScreen | Splash screen that can be shown during application startup |
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| QUndoCommand | The base class of all commands stored on a QUndoStack |
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| QUndoGroup | Group of QUndoStack objects |
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| QUndoStack | Stack of QUndoCommand objects |
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| QUndoView | Displays the contents of a QUndoStack |
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| QUrl | Convenient interface for working with URLs |
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| QUrlInfo | Stores information about URLs |
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| QUuid | Stores a Universally Unique Identifier (UUID) |
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| QValidator | Validation of input text |
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| QVariant | Acts like a union for the most common Qt data types |
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| QWindowsMime | Maps open-standard MIME to Window Clipboard formats |
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| Qt | Contains miscellaneous identifiers used throughout the Qt library |
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