QDirModel Class Reference
[QtGui module]

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

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.