Q3IconDrag Class

The Q3IconDrag class supports drag and drop operations within a Q3IconView . 更多...

头：	#include <Q3IconDrag>
继承：	Q3DragObject

所有成员列表，包括继承成员

公共函数

	Q3IconDrag (QWidget * dragSource , const char * name = 0)
virtual	~Q3IconDrag ()
void	append (const Q3IconDragItem & i , const QRect & pr , const QRect & tr )

重实现公共函数

virtual QByteArray	encodedData (const char * mime ) const
virtual const char *	format (int i ) const

9 公共函数继承自 Q3DragObject
29 公共函数继承自 QObject
3 公共函数继承自 QMimeSource

静态公共成员

bool	canDecode (QMimeSource * e )

1 静态公共成员继承自 Q3DragObject
7 静态公共成员继承自 QObject

额外继承成员

1 特性继承自 QObject
1 公共槽继承自 QObject
1 信号继承自 QObject
1 保护函数继承自 Q3DragObject
8 保护函数继承自 QObject

详细描述

The Q3IconDrag class supports drag and drop operations within a Q3IconView .

A Q3IconDrag object is used to maintain information about the positions of dragged items and the data associated with them. Q3IconViews are able to use this information to paint the dragged items in the correct positions. Internally, Q3IconDrag stores the data associated with drag items in Q3IconDragItem 对象。

If you want to use the extended drag and drop functionality of Q3IconView , create a Q3IconDrag object in a reimplementation of Q3IconView::dragObject ()。然后创建 Q3IconDragItem for each item which should be dragged, set the data it represents with Q3IconDragItem::setData (), and add each Q3IconDragItem to the drag object using append ().

The data in Q3IconDragItems is stored in a QByteArray and is mime-typed (see QMimeSource and the 拖放 overview). If you want to use your own mime-types derive a class from Q3IconDrag 并重实现 format (), encodedData () 和 canDecode ().

The fileiconview example program demonstrates the use of the Q3IconDrag class including subclassing and reimplementing dragObject(), format (), encodedData () 和 canDecode ().

另请参阅 QMimeSource::format ().

成员函数文档编制

Q3IconDrag:: Q3IconDrag ( QWidget * dragSource , const char * name = 0)

Constructs a drag object called name , which is a child of dragSource .

Note that the drag object will be deleted when dragSource 被删除。

`[虚拟]` Q3IconDrag:: ~Q3IconDrag ()

析构函数。

void Q3IconDrag:: append (const Q3IconDragItem & i , const QRect & pr , const QRect & tr )

Append the Q3IconDragItem , i ，到 Q3IconDrag object's list of items. You must also supply the geometry of the pixmap, pr , and the textual caption, tr .

另请参阅 Q3IconDragItem .

`[static]` bool Q3IconDrag:: canDecode ( QMimeSource * e )

返回 true 若 e can be decoded by the Q3IconDrag , otherwise return false.

`[虚拟]` QByteArray Q3IconDrag:: encodedData (const char * mime ) const

重实现自 QMimeSource::encodedData ().

Returns the encoded data of the drag object if mime is application/x-qiconlist.

`[虚拟]` const char * Q3IconDrag:: format ( int i ) const

重实现自 QMimeSource::format ().

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