Qt:Документация 4.3.2/qdropevent-qt3
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[править] Qt 3 Support Members for QDropEvent
The following class members are part of the Qt 3 support layer. They are provided to help you port old code to Qt 4. We advise against using them in new code.
[править] Открытые типы
- enum Action { Copy, Link, Move, Private, UserAction }
[править] Открытые функции
- void accept ( bool accept )
- void acceptAction ( bool accept = true )
- Action action () const
- QByteArray data ( const char * f ) const
- virtual QByteArray encodedData ( const char * format ) const
- virtual const char * format ( int n = 0 ) const
- virtual bool provides ( const char * mimeType ) const
- void setPoint ( const QPoint & point )
[править] Описание типов членов
[править] enum QDropEvent::Action
When a drag and drop action is completed, the target is expected to perform an action on the data provided by the source. This will be one of the following:
| Constant | Value | Description |
|---|---|---|
| QDropEvent::Copy | 0 | The default action. The source simply uses the data provided in the operation. |
| QDropEvent::Link | 1 | The source should somehow create a link to the location specified by the data. |
| QDropEvent::Move | 2 | The source should somehow move the object from the location specified by the data to a new location. |
| QDropEvent::Private | 3 | The target has special knowledge of the MIME type, which the source should respond to in a similar way to a Copy. |
| QDropEvent::UserAction | Private | The source and target can co-operate using special actions. This feature is not currently supported. |
The Link and Move actions only makes sense if the data is a reference, for example, text/uri-list file lists (see QUriDrag).
[править] Описание функций-членов
[править] void QDropEvent::accept ( bool accept )
This is an overloaded member function, provided for convenience.
Call setAccepted(accept) instead.
[править] void QDropEvent::acceptAction ( bool accept = true )
Call this to indicate that the action described by action() is accepted (i.e. if accept is true, which is the default), not merely the default copy action. If you call acceptAction(true), there is no need to also call accept(true).
[править] Action QDropEvent::action () const
Use dropAction() instead.
The table below shows the correspondance between the return type of action() and the return type of dropAction().
| Old enum value | New enum value |
|---|---|
| QDropEvent::Copy | Qt::CopyAction |
| QDropEvent::Move | Qt::MoveAction |
| QDropEvent::Link | Qt::LinkAction |
| other | Qt::CopyAction |
[править] QByteArray QDropEvent::data ( const char * f ) const
The encoded data is in f. Use QDropEvent::encodedData().
[править] QByteArray QDropEvent::encodedData ( const char * format ) const [virtual]
Returns a byte array containing the drag's data, in format.
data() normally needs to get the data from the drag source, which is potentially very slow, so it's advisable to call this function only if you're sure that you will need the data in that particular format.
The resulting data will have a size of 0 if the format was not available.
Reimplemented from QMimeSource.
See also format() and QByteArray::size().
[править] const char * QDropEvent::format ( int n = 0 ) const [virtual]
Returns a string describing one of the available data types for this drag. Common examples are "text/plain" and "image/gif". If n is less than zero or greater than the number of available data types, format() returns 0.
This function is provided mainly for debugging. Most drop targets will use provides().
Reimplemented from QMimeSource.
See also data() and provides().
[править] bool QDropEvent::provides ( const char * mimeType ) const [virtual]
Returns true if this event provides format mimeType; otherwise returns false.
Reimplemented from QMimeSource.
See also data().
[править] void QDropEvent::setPoint ( const QPoint & point )
Sets the drop to happen at the given point. You do not normally need to use this as it will be set internally before your widget receives the drop event.
| Copyright © 2007 Trolltech | Trademarks | Qt 4.3.2
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