Referencia de la Clase QListViewItemIterator

The QListViewItemIterator class provides an iterator for collections of QListViewItems. Más...

#include <qlistview.h>

Lista de todos los miembros.

Tipos públicos
enum	IteratorFlag {   Visible = 0x00000001, Invisible = 0x00000002, Selected = 0x00000004, Unselected = 0x00000008,   Selectable = 0x00000010, NotSelectable = 0x00000020, DragEnabled = 0x00000040, DragDisabled = 0x00000080,   DropEnabled = 0x00000100, DropDisabled = 0x00000200, Expandable = 0x00000400, NotExpandable = 0x00000800,   Checked = 0x00001000, NotChecked = 0x00002000, Visible = 0x00000001, Invisible = 0x00000002,   Selected = 0x00000004, Unselected = 0x00000008, Selectable = 0x00000010, NotSelectable = 0x00000020,   DragEnabled = 0x00000040, DragDisabled = 0x00000080, DropEnabled = 0x00000100, DropDisabled = 0x00000200,   Expandable = 0x00000400, NotExpandable = 0x00000800, Checked = 0x00001000, NotChecked = 0x00002000 }
enum	IteratorFlag {   Visible = 0x00000001, Invisible = 0x00000002, Selected = 0x00000004, Unselected = 0x00000008,   Selectable = 0x00000010, NotSelectable = 0x00000020, DragEnabled = 0x00000040, DragDisabled = 0x00000080,   DropEnabled = 0x00000100, DropDisabled = 0x00000200, Expandable = 0x00000400, NotExpandable = 0x00000800,   Checked = 0x00001000, NotChecked = 0x00002000, Visible = 0x00000001, Invisible = 0x00000002,   Selected = 0x00000004, Unselected = 0x00000008, Selectable = 0x00000010, NotSelectable = 0x00000020,   DragEnabled = 0x00000040, DragDisabled = 0x00000080, DropEnabled = 0x00000100, DropDisabled = 0x00000200,   Expandable = 0x00000400, NotExpandable = 0x00000800, Checked = 0x00001000, NotChecked = 0x00002000 }
Métodos públicos
	QListViewItemIterator ()
	QListViewItemIterator (QListViewItem *item)
	QListViewItemIterator (QListViewItem *item, int iteratorFlags)
	QListViewItemIterator (const QListViewItemIterator &it)
	QListViewItemIterator (QListView *lv)
	QListViewItemIterator (QListView *lv, int iteratorFlags)
QListViewItemIterator &	operator= (const QListViewItemIterator &it)
	~QListViewItemIterator ()
QListViewItemIterator &	operator++ ()
const QListViewItemIterator	operator++ (int)
QListViewItemIterator &	operator+= (int j)
QListViewItemIterator &	operator-- ()
const QListViewItemIterator	operator-- (int)
QListViewItemIterator &	operator-= (int j)
QListViewItem *	operator* ()
QListViewItem *	current () const
	QListViewItemIterator ()
	QListViewItemIterator (QListViewItem *item)
	QListViewItemIterator (QListViewItem *item, int iteratorFlags)
	QListViewItemIterator (const QListViewItemIterator &it)
	QListViewItemIterator (QListView *lv)
	QListViewItemIterator (QListView *lv, int iteratorFlags)
QListViewItemIterator &	operator= (const QListViewItemIterator &it)
	~QListViewItemIterator ()
QListViewItemIterator &	operator++ ()
const QListViewItemIterator	operator++ (int)
QListViewItemIterator &	operator+= (int j)
QListViewItemIterator &	operator-- ()
const QListViewItemIterator	operator-- (int)
QListViewItemIterator &	operator-= (int j)
QListViewItem *	operator* ()
QListViewItem *	current () const
Atributos protegidos
QListViewItem *	curr
QListView *	listView
Amigas
struct	QListViewPrivate
class	QListView
class	QListViewItem

---

Descripción detallada

The QListViewItemIterator class provides an iterator for collections of QListViewItems.

Construct an instance of a QListViewItemIterator, with either a QListView* or a QListViewItem* as argument, to operate on the tree of QListViewItems, starting from the argument.

A QListViewItemIterator iterates over all the items from its starting point. This means that it always makes the first child of the current item the new current item. If there is no child, the next sibling becomes the new current item; and if there is no next sibling, the next sibling of the parent becomes current.

The following example creates a list of all the items that have been selected by the user, storing pointers to the items in a QPtrList:

    QPtrList<QListViewItem> lst;
    QListViewItemIterator it( myListView );
    while ( it.current() ) {
        if ( it.current()->isSelected() )
            lst.append( it.current() );
        ++it;
    }

An alternative approach is to use an IteratorFlag:

    QPtrList<QListViewItem> lst;
    QListViewItemIterator it( myListView, QListViewItemIterator::Selected );
    while ( it.current() ) {
        lst.append( it.current() );
        ++it;
    }

A QListViewItemIterator provides a convenient and easy way to traverse a hierarchical QListView.

Multiple QListViewItemIterators can operate on the tree of QListViewItems. A QListView knows about all iterators operating on its QListViewItems. So when a QListViewItem gets removed all iterators that point to this item are updated and point to the following item if possible, otherwise to a valid item before the current one or to 0. Note however that deleting the parent item of an item that an iterator points to is not safe.

Ver también:

QListView, QListViewItem

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Documentación de las enumeraciones miembro de la clase

enum QListViewItemIterator::IteratorFlag

These flags can be passed to a QListViewItemIterator constructor (OR-ed together if more than one is used), so that the iterator will only iterate over items that match the given flags.

Visible Invisible Selected Unselected Selectable NotSelectable DragEnabled DragDisabled DropEnabled DropDisabled Expandable NotExpandable Checked NotChecked

Valores de enumeraciones:

Visible
Invisible
Selected
Unselected
Selectable
NotSelectable
DragEnabled
DragDisabled
DropEnabled
DropDisabled
Expandable
NotExpandable
Checked
NotChecked
Visible
Invisible
Selected
Unselected
Selectable
NotSelectable
DragEnabled
DragDisabled
DropEnabled
DropDisabled
Expandable
NotExpandable
Checked
NotChecked

enum QListViewItemIterator::IteratorFlag

Valores de enumeraciones:

Visible
Invisible
Selected
Unselected
Selectable
NotSelectable
DragEnabled
DragDisabled
DropEnabled
DropDisabled
Expandable
NotExpandable
Checked
NotChecked
Visible
Invisible
Selected
Unselected
Selectable
NotSelectable
DragEnabled
DragDisabled
DropEnabled
DropDisabled
Expandable
NotExpandable
Checked
NotChecked

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Documentación del constructor y destructor

QListViewItemIterator::QListViewItemIterator

(

)

Constructs an empty iterator.

QListViewItemIterator::QListViewItemIterator

(

QListViewItem *

item

)

Constructs an iterator for the QListView that contains the item. The current iterator item is set to point to the item.

QListViewItemIterator::QListViewItemIterator	(	QListViewItem *	item,
		int	iteratorFlags
	)

Constructs an iterator for the QListView that contains the item using the flags iteratorFlags. The current iterator item is set to point to item or the next matching item if item doesn't match the flags.

Ver también:

QListViewItemIterator::IteratorFlag

QListViewItemIterator::QListViewItemIterator

(

const QListViewItemIterator &

it

)

Constructs an iterator for the same QListView as it. The current iterator item is set to point on the current item of it.

QListViewItemIterator::QListViewItemIterator

(

QListView *

lv

)

Constructs an iterator for the QListView lv. The current iterator item is set to point on the first child (QListViewItem) of lv.

QListViewItemIterator::QListViewItemIterator	(	QListView *	lv,
		int	iteratorFlags
	)

Constructs an iterator for the QListView lv with the flags iteratorFlags. The current iterator item is set to point on the first child (QListViewItem) of lv that matches the flags.

Ver también:

QListViewItemIterator::IteratorFlag

QListViewItemIterator::~QListViewItemIterator

(

)

Destroys the iterator.

QListViewItemIterator::QListViewItemIterator

(

)

QListViewItemIterator::QListViewItemIterator

(

QListViewItem *

item

)

QListViewItemIterator::QListViewItemIterator	(	QListViewItem *	item,
		int	iteratorFlags
	)

QListViewItemIterator::QListViewItemIterator

(

const QListViewItemIterator &

it

)

QListViewItemIterator::QListViewItemIterator

(

QListView *

lv

)

QListViewItemIterator::QListViewItemIterator	(	QListView *	lv,
		int	iteratorFlags
	)

QListViewItemIterator::~QListViewItemIterator

(

)

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Documentación de las funciones miembro

QListViewItem * QListViewItemIterator::current

(

)

const

Returns iterator's current item.

QListViewItem* QListViewItemIterator::current

(

)

const

QListViewItem * QListViewItemIterator::operator*

(

)

Dereference operator. Returns a reference to the current item. The same as current().

QListViewItem* QListViewItemIterator::operator*

(

)

QListViewItemIterator & QListViewItemIterator::operator++

(

)

Prefix ++. Makes the next item the new current item and returns it. Returns 0 if the current item is the last item or the QListView is 0.

QListViewItemIterator& QListViewItemIterator::operator++

(

)

const QListViewItemIterator QListViewItemIterator::operator++

(

int

)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. Postfix ++. Makes the next item the new current item and returns the item that was the current item.

const QListViewItemIterator QListViewItemIterator::operator++

(

int

)

QListViewItemIterator & QListViewItemIterator::operator+=

(

int

j

)

Sets the current item to the item j positions after the current item. If that item is beyond the last item, the current item is set to 0. Returns the current item.

QListViewItemIterator& QListViewItemIterator::operator+=

(

int

j

)

QListViewItemIterator & QListViewItemIterator::operator--

(

)

Prefix --. Makes the previous item the new current item and returns it. Returns 0 if the current item is the first item or the QListView is 0.

const QListViewItemIterator QListViewItemIterator::operator--

(

int

)

QListViewItemIterator& QListViewItemIterator::operator--

(

)

const QListViewItemIterator QListViewItemIterator::operator--

(

int

)

Esta es una función miembro sobrecargada que se suministra por conveniencia. Difiere de la anterior función solamente en los argumentos que acepta. Postfix --. Makes the previous item the new current item and returns the item that was the current item.

QListViewItemIterator& QListViewItemIterator::operator-=

(

int

j

)

QListViewItemIterator & QListViewItemIterator::operator-=

(

int

j

)

Sets the current item to the item j positions before the current item. If that item is before the first item, the current item is set to 0. Returns the current item.

QListViewItemIterator& QListViewItemIterator::operator=

(

const QListViewItemIterator &

it

)

QListViewItemIterator & QListViewItemIterator::operator=

(

const QListViewItemIterator &

it

)

Assignment. Makes a copy of it and returns a reference to its iterator.

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Documentación de las funciones relacionadas y clases amigas

QListView [friend]

QListViewItem [friend]

QListViewPrivate [friend]

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Documentación de los datos miembro

QListViewItem * QListViewItemIterator::curr [protected]

QListView * QListViewItemIterator::listView [protected]

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La documentación para esta clase fue generada a partir de los siguientes ficheros:

• src/qt/include/qlistview.h
• src/qt/src/widgets/qlistview.h
• src/qt/src/widgets/qlistview.cpp