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QMacPasteboardMime Class Reference

The QMacPasteboardMime class converts between a MIME type and a Uniform Type Identifier (UTI) format. More...

 #include <QMacPasteboardMime>

This class was introduced in Qt 4.2.

Public Functions

QMacPasteboardMime ( char t )
virtual ~QMacPasteboardMime ()
virtual bool canConvert ( const QString & mime, QString flav ) = 0
virtual QList<QByteArray> convertFromMime ( const QString & mime, QVariant data, QString flav ) = 0
virtual QVariant convertToMime ( const QString & mime, QList<QByteArray> data, QString flav ) = 0
virtual QString convertorName () = 0
virtual QString flavorFor ( const QString & mime ) = 0
virtual QString mimeFor ( QString flav ) = 0

Static Public Members

QList<QMacPasteboardMime *> all ( uchar t )
QMacPasteboardMime * convertor ( uchar t, const QString & mime, QString flav )
QString flavorToMime ( uchar t, QString flav )

Related Non-Members

void qRegisterDraggedTypes ( const QStringList & types )

Detailed Description

The QMacPasteboardMime class converts between a MIME type and a Uniform Type Identifier (UTI) format.

Qt's drag and drop and clipboard facilities use the MIME standard. On X11, this maps trivially to the Xdnd protocol. On Mac, although some applications use MIME to describe clipboard contents, it is more common to use Apple's UTI format.

QMacPasteboardMime's role is to bridge the gap between MIME and UTI; By subclasses this class, one can extend Qt's drag and drop and clipboard handling to convert to and from unsupported, or proprietary, UTI formats.

A subclass of QMacPasteboardMime will automatically be registered, and active, upon instantiation.

Qt has predefined support for the following UTIs:

  • public.utf8-plain-text - converts to "text/plain"
  • public.utf16-plain-text - converts to "text/plain"
  • public.html - converts to "text/html"
  • public.url - converts to "text/uri-list"
  • public.file-url - converts to "text/uri-list"
  • public.tiff - converts to "application/x-qt-image"
  • public.vcard - converts to "text/plain"
  • com.apple.traditional-mac-plain-text - converts to "text/plain"
  • com.apple.pict - converts to "application/x-qt-image"

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().

Note: The API uses the term "flavor" in some cases. This is for backwards compatibility reasons, and should now be understood as UTIs.

Member Function Documentation

QMacPasteboardMime::QMacPasteboardMime ( char t )

Constructs a new conversion object of type t, adding it to the globally accessed list of available convertors.

QMacPasteboardMime::~QMacPasteboardMime () [virtual]

Destroys a conversion object, removing it from the global list of available convertors.

QList<QMacPasteboardMime *> QMacPasteboardMime::all ( uchar t ) [static]

Returns a list of all currently defined QMacPasteboardMime objects of type t.

bool QMacPasteboardMime::canConvert ( const QString & mime, QString flav ) [pure virtual]

Returns true if the convertor can convert (both ways) between mime and flav; otherwise returns false.

All subclasses must reimplement this pure virtual function.

QList<QByteArray> QMacPasteboardMime::convertFromMime ( const QString & mime, QVariant data, QString flav ) [pure virtual]

Returns data converted from MIME type mime to Mac UTI flav.

Note that Mac flavors must all be self-terminating. The return value may contain trailing data.

All subclasses must reimplement this pure virtual function.

QVariant QMacPasteboardMime::convertToMime ( const QString & mime, QList<QByteArray> data, QString flav ) [pure virtual]

Returns data converted from Mac UTI flav to MIME type mime.

Note that Mac flavors must all be self-terminating. The input data may contain trailing data.

All subclasses must reimplement this pure virtual function.

QMacPasteboardMime * QMacPasteboardMime::convertor ( uchar t, const QString & mime, QString flav ) [static]

Returns the most-recently created QMacPasteboardMime of type t that can convert between the mime and flav formats. Returns 0 if no such convertor exists.

QString QMacPasteboardMime::convertorName () [pure virtual]

Returns a name for the convertor.

All subclasses must reimplement this pure virtual function.

QString QMacPasteboardMime::flavorFor ( const QString & mime ) [pure virtual]

Returns the Mac UTI used for MIME type mime, or 0 if this convertor does not support mime.

All subclasses must reimplement this pure virtual function.

QString QMacPasteboardMime::flavorToMime ( uchar t, QString flav ) [static]

Returns a MIME type of type t for flav, or 0 if none exists.

QString QMacPasteboardMime::mimeFor ( QString flav ) [pure virtual]

Returns the MIME UTI used for Mac flavor flav, or 0 if this convertor does not support flav.

All subclasses must reimplement this pure virtual function.

Related Non-Members

void qRegisterDraggedTypes ( const QStringList & types )

Registers the given types as custom pasteboard types.

This function should be called to enable the Drag and Drop events for custom pasteboard types on Cocoa implementations. This is required in addition to a QMacPasteboardMime subclass implementation. By default drag and drop is enabled for all standard pasteboard types.

See also QMacPasteboardMime.

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