Viadeo Twitter Google Bookmarks ! Facebook Digg del.icio.us MySpace Yahoo MyWeb Blinklist Netvouz Reddit Simpy StumbleUpon Bookmarks Windows Live Favorites 
Logo Documentation Qt ·  Page d'accueil  ·  Tous les espaces de nom  ·  Toutes les classes  ·  Classes principales  ·  Annotées  ·  Classes groupées  ·  Modules  ·  Fonctions  · 

QDirModel Class Reference
[QtGui module]

The QDirModel class provides a data model for the local filesystem. More...

 #include <QDirModel>

Inherits QAbstractItemModel.

Public Types

  • enum Roles { FileIconRole, FilePathRole, FileNameRole }

Properties

  • 1 property inherited from QObject

Public Functions

  • QDirModel ( const QStringList & nameFilters, QDir::Filters filters, QDir::SortFlags sort, QObject * parent = 0 )
  • QDirModel ( QObject * parent = 0 )
  • virtual int columnCount ( const QModelIndex & parent = QModelIndex() ) const
  • virtual QVariant data ( const QModelIndex & index, int role = Qt::DisplayRole ) const
  • virtual bool dropMimeData ( const QMimeData * data, Qt::DropAction action, int row, int column, const QModelIndex & parent )
  • QIcon fileIcon ( const QModelIndex & index ) const
  • QFileInfo fileInfo ( const QModelIndex & index ) const
  • QString fileName ( const QModelIndex & index ) const
  • QString filePath ( const QModelIndex & index ) const
  • QDir::Filters filter () const
  • virtual Qt::ItemFlags flags ( const QModelIndex & index ) const
  • virtual bool hasChildren ( const QModelIndex & parent = QModelIndex() ) const
  • virtual QVariant headerData ( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const
  • QFileIconProvider * iconProvider () const
  • virtual QModelIndex index ( int row, int column, const QModelIndex & parent = QModelIndex() ) const
  • QModelIndex index ( const QString & path, int column = 0 ) const
  • bool isDir ( const QModelIndex & index ) const
  • bool isReadOnly () const
  • bool lazyChildCount () const
  • virtual QMimeData * mimeData ( const QModelIndexList & indexes ) const
  • virtual QStringList mimeTypes () const
  • QModelIndex mkdir ( const QModelIndex & parent, const QString & name )
  • QStringList nameFilters () const
  • virtual QModelIndex parent ( const QModelIndex & child ) const
  • bool remove ( const QModelIndex & index )
  • bool resolveSymlinks () const
  • bool rmdir ( const QModelIndex & index )
  • virtual int rowCount ( const QModelIndex & parent = QModelIndex() ) const
  • virtual bool setData ( const QModelIndex & index, const QVariant & value, int role = Qt::EditRole )
  • void setFilter ( QDir::Filters filters )
  • void setIconProvider ( QFileIconProvider * provider )
  • void setLazyChildCount ( bool enable )
  • void setNameFilters ( const QStringList & filters )
  • void setReadOnly ( bool enable )
  • void setResolveSymlinks ( bool enable )
  • void setSorting ( QDir::SortFlags sort )
  • virtual void sort ( int column, Qt::SortOrder order = Qt::AscendingOrder )
  • QDir::SortFlags sorting () const
  • virtual Qt::DropActions supportedDropActions () const

Public Slots

  • void refresh ( const QModelIndex & parent = QModelIndex() )

Additional Inherited Members


Detailed Description

The QDirModel class provides a data model for the local filesystem.

This class provides access to the local filesystem, providing functions for renaming and removing files and directories, and for creating new directories. In the simplest case, it can be used with a suitable display widget as part of a browser or filer.

QDirModel keeps a cache with file information. The cache needs to be updated with refresh().

A directory model that displays the contents of a default directory is usually constructed with a parent object:

     QDirModel *model = new QDirModel;

A tree view can be used to display the contents of the model

     QTreeView *tree = new QTreeView(splitter);
     tree->setModel(model);

and the contents of a particular directory can be displayed by setting the tree view's root index:

     tree->setRootIndex(model->index(QDir::currentPath()));

The view's root index can be used to control how much of a hierarchical model is displayed. QDirModel provides a convenience function that returns a suitable model index for a path to a directory within the model.

QDirModel can be accessed using the standard interface provided by QAbstractItemModel, but it also provides some convenience functions that are specific to a directory model. The fileInfo() and isDir() functions provide information about the underlying files and directories related to items in the model.

Directories can be created and removed using mkdir(), rmdir(), and the model will be automatically updated to take the changes into account.

Note: QDirModel requires an instance of a GUI application.

See also nameFilters(), setFilter(), filter(), QListView, QTreeView, Dir View Example, and Model Classes.


Member Type Documentation

enum QDirModel::Roles

ConstantValue
QDirModel::FileIconRoleQt::DecorationRole
QDirModel::FilePathRoleQt::UserRole + 1
QDirModel::FileNameRole?


Property Documentation

lazyChildCount : bool

This property holds whether the directory model optimizes the hasChildren function to only check if the item is a directory.

If this property is set to false, the directory model will make sure that a directory actually containes any files before reporting that it has children. Otherwise the directory model will report that an item has children if the item is a directory.

This property is false by default

Access functions:

  • bool lazyChildCount () const
  • void setLazyChildCount ( bool enable )

readOnly : bool

This property holds whether the directory model allows writing to the file system.

If this property is set to false, the directory model will allow renaming, copying and deleting of files and directories.

This property is true by default

Access functions:

  • bool isReadOnly () const
  • void setReadOnly ( bool enable )

resolveSymlinks : bool

This property holds whether the directory model should resolve symbolic links.

This is only relevant on operating systems that support symbolic links.

Access functions:

  • bool resolveSymlinks () const
  • void setResolveSymlinks ( bool enable )

Member Function Documentation

QDirModel::QDirModel ( const QStringList & nameFilters, QDir::Filters filters, QDir::SortFlags sort, QObject * parent = 0 )

Constructs a new directory model with the given parent. Only those files matching the nameFilters and the filters are included in the model. The sort order is given by the sort flags.

QDirModel::QDirModel ( QObject * parent = 0 )

Constructs a directory model with the given parent.

QDirModel::~QDirModel ()

Destroys this directory model.

int QDirModel::columnCount ( const QModelIndex & parent = QModelIndex() ) const   [virtual]

Returns the number of columns in the parent model item.

Reimplemented from QAbstractItemModel.

QVariant QDirModel::data ( const QModelIndex & index, int role = Qt::DisplayRole ) const   [virtual]

Returns the data for the model item index with the given role.

Reimplemented from QAbstractItemModel.

See also setData().

bool QDirModel::dropMimeData ( const QMimeData * data, Qt::DropAction action, int row, int column, const QModelIndex & parent )   [virtual]

Handles the data supplied by a drag and drop operation that ended with the given action over the row in the model specified by the row and column and by the parent index.

Reimplemented from QAbstractItemModel.

See also supportedDropActions().

QIcon QDirModel::fileIcon ( const QModelIndex & index ) const

Returns the icons for the item stored in the model under the given index.

QFileInfo QDirModel::fileInfo ( const QModelIndex & index ) const

Returns the file information for the specified model index.

Note: If the model index represents a symbolic link in the underlying filing system, the file information returned will contain information about the symbolic link itself, regardless of whether resolveSymlinks is enabled or not.

See also QFileInfo::symLinkTarget().

QString QDirModel::fileName ( const QModelIndex & index ) const

Returns the name of the item stored in the model under the index given.

QString QDirModel::filePath ( const QModelIndex & index ) const

Returns the path of the item stored in the model under the index given.

QDir::Filters QDirModel::filter () const

Returns the filter specification for the directory model.

See also setFilter() and QDir::Filters.

Qt::ItemFlags QDirModel::flags ( const QModelIndex & index ) const   [virtual]

Returns the item flags for the given index in the model.

Reimplemented from QAbstractItemModel.

See also Qt::ItemFlags.

bool QDirModel::hasChildren ( const QModelIndex & parent = QModelIndex() ) const   [virtual]

Returns true if the parent model item has children; otherwise returns false.

Reimplemented from QAbstractItemModel.

QVariant QDirModel::headerData ( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const   [virtual]

Returns the data stored under the given role for the specified section of the header with the given orientation.

Reimplemented from QAbstractItemModel.

QFileIconProvider * QDirModel::iconProvider () const

Returns the file icon provider for this directory model.

See also setIconProvider().

QModelIndex QDirModel::index ( int row, int column, const QModelIndex & parent = QModelIndex() ) const   [virtual]

Returns the model item index for the item in the parent with the given row and column.

Reimplemented from QAbstractItemModel.

QModelIndex QDirModel::index ( const QString & path, int column = 0 ) const

This is an overloaded member function, provided for convenience.

Returns the model item index for the given path.

bool QDirModel::isDir ( const QModelIndex & index ) const

Returns true if the model item index represents a directory; otherwise returns false.

QMimeData * QDirModel::mimeData ( const QModelIndexList & indexes ) const   [virtual]

Returns an object that contains a serialized description of the specified indexes. The format used to describe the items corresponding to the indexes is obtained from the mimeTypes() function.

If the list of indexes is empty, 0 is returned rather than a serialized empty list.

Reimplemented from QAbstractItemModel.

QStringList QDirModel::mimeTypes () const   [virtual]

Returns a list of MIME types that can be used to describe a list of items in the model.

Reimplemented from QAbstractItemModel.

QModelIndex QDirModel::mkdir ( const QModelIndex & parent, const QString & name )

Create a directory with the name in the parent model item.

QStringList QDirModel::nameFilters () const

Returns a list of filters applied to the names in the model.

See also setNameFilters().

QModelIndex QDirModel::parent ( const QModelIndex & child ) const   [virtual]

Return the parent of the given child model item.

Reimplemented from QAbstractItemModel.

void QDirModel::refresh ( const QModelIndex & parent = QModelIndex() )   [slot]

QDirModel caches file information. This function updates the cache. The parent parameter is the directory from which the model is updated; the default value will update the model from root directory of the file system (the entire model).

bool QDirModel::remove ( const QModelIndex & index )

Removes the model item index from the directory model and deletes the corresponding file from the file system, returning true if successful. If the item cannot be removed, false is returned.

Warning: This function deletes files from the file system; it does not move them to a location where they can be recovered.

See also rmdir().

bool QDirModel::rmdir ( const QModelIndex & index )

Removes the directory corresponding to the model item index in the directory model and deletes the corresponding directory from the file system, returning true if successful. If the directory cannot be removed, false is returned.

Warning: This function deletes directories from the file system; it does not move them to a location where they can be recovered.

See also remove().

int QDirModel::rowCount ( const QModelIndex & parent = QModelIndex() ) const   [virtual]

Returns the number of rows in the parent model item.

Reimplemented from QAbstractItemModel.

bool QDirModel::setData ( const QModelIndex & index, const QVariant & value, int role = Qt::EditRole )   [virtual]

Sets the data for the model item index with the given role to the data referenced by the value. Returns true if successful; otherwise returns false.

Reimplemented from QAbstractItemModel.

See also data() and Qt::ItemDataRole.

void QDirModel::setFilter ( QDir::Filters filters )

Sets the directory model's filter to that specified by filters.

Note that the filter you set should always include the QDir::AllDirs enum value, otherwise QDirModel won't be able to read the directory structure.

See also filter() and QDir::Filters.

void QDirModel::setIconProvider ( QFileIconProvider * provider )

Sets the provider of file icons for the directory model.

See also iconProvider().

void QDirModel::setNameFilters ( const QStringList & filters )

Sets the name filters for the directory model.

See also nameFilters().

void QDirModel::setSorting ( QDir::SortFlags sort )

Sets the directory model's sorting order to that specified by sort.

See also sorting() and QDir::SortFlags.

void QDirModel::sort ( int column, Qt::SortOrder order = Qt::AscendingOrder )   [virtual]

Sort the model items in the column using the order given. The order is a value defined in Qt::SortOrder.

Reimplemented from QAbstractItemModel.

QDir::SortFlags QDirModel::sorting () const

Returns the sorting method used for the directory model.

See also setSorting() and QDir::SortFlags.

Qt::DropActions QDirModel::supportedDropActions () const   [virtual]

Returns the drop actions supported by this model.

Reimplemented from QAbstractItemModel.

See also Qt::DropActions.

Publicité

Best Of

Actualités les plus lues

Semaine
Mois
Année
  1. « Quelque chose ne va vraiment pas avec les développeurs "modernes" », un développeur à "l'ancienne" critique la multiplication des bibliothèques 44
  2. Microsoft ouvre aux autres compilateurs C++ AMP, la spécification pour la conception d'applications parallèles C++ utilisant le GPU 22
  3. Les développeurs ignorent-ils trop les failles découvertes dans leur code ? Prenez-vous en compte les remarques des autres ? 17
  4. RIM : « 13 % des développeurs ont gagné plus de 100 000 $ sur l'AppWord », Qt et open-source au menu du BlackBerry DevCon Europe 0
  5. BlackBerry 10 : premières images du prochain OS de RIM qui devrait intégrer des widgets et des tuiles inspirées de Windows Phone 0
  6. Quelles nouveautés de C++11 Visual C++ doit-il rapidement intégrer ? Donnez-nous votre avis 10
  7. Adieu qmake, bienvenue qbs : Qt Building Suite, un outil déclaratif et extensible pour la compilation de projets Qt 17
Page suivante

Le Qt Quarterly au hasard

Logo

Les développeurs viennent de Mars, les designers de Vénus

Qt Quarterly est la revue trimestrielle proposée par Nokia et à destination des développeurs Qt. Ces articles d'une grande qualité technique sont rédigés par des experts Qt. Lire l'article.

Communauté

Ressources

Liens utiles

Contact

  • Vous souhaitez rejoindre la rédaction ou proposer un tutoriel, une traduction, une question... ? Postez dans le forum Contribuez ou contactez-nous par MP ou par email (voir en bas de page).

Qt dans le magazine

Cette page est une traduction d'une page de la documentation de Qt, écrite par Nokia Corporation and/or its subsidiary(-ies). Les éventuels problèmes résultant d'une mauvaise traduction ne sont pas imputables à Nokia. Qt 4.4
Copyright © 2012 Developpez LLC. Tous droits réservés Developpez LLC. Aucune reproduction, même partielle, ne peut être faite de ce site et de l'ensemble de son contenu : textes, documents et images sans l'autorisation expresse de Developpez LLC. Sinon, vous encourez selon la loi jusqu'à 3 ans de prison et jusqu'à 300 000 E de dommages et intérêts. Cette page est déposée à la SACD.
Vous avez déniché une erreur ? Un bug ? Une redirection cassée ? Ou tout autre problème, quel qu'il soit ? Ou bien vous désirez participer à ce projet de traduction ? N'hésitez pas à nous contacter ou par MP !
 
 
 
 
Partenaires

Hébergement Web