The QDirModel class provides a data model for the local filesystem. 更多...
| 头： | #include <QDirModel> |
| qmake: | QT += widgets |
| 继承： | QAbstractItemModel |
该类已过时。 提供它是为使旧源代码能继续工作。强烈建议不要在新代码中使用它。
| enum | Roles { FileIconRole, FilePathRole, FileNameRole } |
| QDirModel (const QStringList & nameFilters , QDir::Filters filters , QDir::SortFlags sort , QObject * parent = nullptr) | |
| QDirModel (QObject * parent = nullptr) | |
| virtual | ~QDirModel () |
| 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 |
| QFileIconProvider * | iconProvider () const |
| QModelIndex | index (const QString & path , int column = 0) const |
| bool | isDir (const QModelIndex & index ) const |
| bool | isReadOnly () const |
| bool | lazyChildCount () const |
| QModelIndex | mkdir (const QModelIndex & parent , const QString & name ) |
| QStringList | nameFilters () const |
| bool | remove (const QModelIndex & index ) |
| bool | resolveSymlinks () const |
| bool | rmdir (const QModelIndex & index ) |
| 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 ) |
| QDir::SortFlags | sorting () const |
| virtual int | columnCount (const QModelIndex & parent = QModelIndex()) const override |
| virtual QVariant | data (const QModelIndex & index , int role = Qt::DisplayRole) const override |
| virtual bool | dropMimeData (const QMimeData * data , Qt::DropAction action , int row , int column , const QModelIndex & parent ) override |
| virtual Qt::ItemFlags | flags (const QModelIndex & index ) const override |
| virtual bool | hasChildren (const QModelIndex & parent = QModelIndex()) const override |
| virtual QVariant | headerData (int section , Qt::Orientation orientation , int role = Qt::DisplayRole) const override |
| virtual QModelIndex | index (int row , int column , const QModelIndex & parent = QModelIndex()) const override |
| virtual QMimeData * | mimeData (const QModelIndexList & indexes ) const override |
| virtual QStringList | mimeTypes () const override |
| virtual QModelIndex | parent (const QModelIndex & child ) const override |
| virtual int | rowCount (const QModelIndex & parent = QModelIndex()) const override |
| virtual bool | setData (const QModelIndex & index , const QVariant & value , int role = Qt::EditRole) override |
| virtual void | sort (int column , Qt::SortOrder order = Qt::AscendingOrder) override |
| virtual Qt::DropActions | supportedDropActions () const override |
| void | refresh (const QModelIndex & parent = QModelIndex()) |
| const QMetaObject | staticMetaObject |
The QDirModel class provides a data model for the local filesystem.
The usage of QDirModel is not recommended anymore. The QFileSystemModel class is a more performant alternative.
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 ().
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 () 和 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.
注意： QDirModel requires an instance of QApplication .
另请参阅 nameFilters (), setFilter (), filter (), QListView , QTreeView , QFileSystemModel , 目录视图范例 ，和 模型类 .
| 常量 | 值 |
|---|---|
QDirModel::FileIconRole
|
Qt::DecorationRole
|
QDirModel::FilePathRole
|
Qt::UserRole + 1
|
QDirModel::FileNameRole
|
258
|
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.
此特性是
false
默认情况下
访问函数：
| bool | lazyChildCount () const |
| void | setLazyChildCount (bool enable ) |
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.
此特性是
true
默认情况下
访问函数：
| bool | isReadOnly () const |
| void | setReadOnly (bool enable ) |
此特性保持目录模型是否应解析符号链接
This is only relevant on operating systems that support symbolic links.
访问函数：
| bool | resolveSymlinks () const |
| void | setResolveSymlinks (bool enable ) |
Constructs a new directory model with the given parent . Only those files matching the nameFilters 和 filters are included in the model. The sort order is given by the sort flags.
Constructs a directory model with the given parent .
[虚拟]
QDirModel::
~QDirModel
()
Destroys this directory model.
[override virtual]
int
QDirModel::
columnCount
(const
QModelIndex
&
parent
= QModelIndex()) const
重实现自 QAbstractItemModel::columnCount ().
Returns the number of columns in the parent model item.
[override virtual]
QVariant
QDirModel::
data
(const
QModelIndex
&
index
,
int
role
= Qt::DisplayRole) const
重实现自 QAbstractItemModel::data ().
Returns the data for the model item index 采用给定 role .
另请参阅 setData ().
[override virtual]
bool
QDirModel::
dropMimeData
(const
QMimeData
*
data
,
Qt::DropAction
action
,
int
row
,
int
column
, const
QModelIndex
&
parent
)
重实现自 QAbstractItemModel::dropMimeData ().
处理 data 的提供是通过结束拖放操作，按给定 action over the row in the model specified by the row and column and by the parent 索引。
返回
true
if the drop was successful, and false otherwise.
另请参阅 supportedDropActions ().
Returns the icons for the item stored in the model under the given index .
Returns the file information for the specified model index .
注意： 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.
另请参阅 QFileInfo::symLinkTarget ().
Returns the name of the item stored in the model under the index 给定。
Returns the path of the item stored in the model under the index 给定。
Returns the filter specification for the directory model.
另请参阅 setFilter () 和 QDir::Filters .
[override virtual]
Qt::ItemFlags
QDirModel::
flags
(const
QModelIndex
&
index
) const
重实现自 QAbstractItemModel::flags ().
返回项标志为给定 index in the model.
另请参阅 Qt::ItemFlags .
[override virtual]
bool
QDirModel::
hasChildren
(const
QModelIndex
&
parent
= QModelIndex()) const
重实现自 QAbstractItemModel::hasChildren ().
返回
true
若
parent
model item has children; otherwise returns
false
.
[override virtual]
QVariant
QDirModel::
headerData
(
int
section
,
Qt::Orientation
orientation
,
int
role
= Qt::DisplayRole) const
重实现自 QAbstractItemModel::headerData ().
Returns the data stored under the given role 为指定 section of the header with the given orientation .
Returns the file icon provider for this directory model.
另请参阅 setIconProvider ().
[override virtual]
QModelIndex
QDirModel::
index
(
int
row
,
int
column
, const
QModelIndex
&
parent
= QModelIndex()) const
重实现自 QAbstractItemModel::index ().
Returns the model item index for the item in the parent 采用给定 row and column .
这是重载函数。
Returns the model item index for the given path .
返回
true
若模型项
index
represents a directory; otherwise returns
false
.
[override virtual]
QMimeData
*QDirModel::
mimeData
(const
QModelIndexList
&
indexes
) const
重实现自 QAbstractItemModel::mimeData ().
返回的对象包含序列化描述为指定 indexes . The format used to describe the items corresponding to the indexes is obtained from the mimeTypes () 函数。
If the list of indexes is empty, 0 is returned rather than a serialized empty list.
[override virtual]
QStringList
QDirModel::
mimeTypes
() const
重实现自 QAbstractItemModel::mimeTypes ().
Returns a list of MIME types that can be used to describe a list of items in the model.
Create a directory with the name 在 parent model item.
Returns a list of filters applied to the names in the model.
另请参阅 setNameFilters ().
[override virtual]
QModelIndex
QDirModel::
parent
(const
QModelIndex
&
child
) const
重实现自 QAbstractItemModel::parent ().
Return the parent of the given child model item.
[slot]
void
QDirModel::
refresh
(const
QModelIndex
&
parent
= QModelIndex())
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).
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.
警告： This function deletes files from the file system; it does not move them to a location where they can be recovered.
另请参阅 rmdir ().
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.
警告： This function deletes directories from the file system; it does not move them to a location where they can be recovered.
另请参阅 remove ().
[override virtual]
int
QDirModel::
rowCount
(const
QModelIndex
&
parent
= QModelIndex()) const
重实现自 QAbstractItemModel::rowCount ().
Returns the number of rows in the parent model item.
[override virtual]
bool
QDirModel::
setData
(const
QModelIndex
&
index
, const
QVariant
&
value
,
int
role
= Qt::EditRole)
重实现自 QAbstractItemModel::setData ().
Sets the data for the model item
index
采用给定
role
to the data referenced by the
value
。返回
true
若成功；否则返回
false
.
另请参阅 data () 和 Qt::ItemDataRole .
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.
另请参阅 filter () 和 QDir::Filters .
设置 provider of file icons for the directory model.
另请参阅 iconProvider ().
Sets the name filters for the directory model.
另请参阅 nameFilters ().
Sets the directory model's sorting order to that specified by sort .
另请参阅 sorting () 和 QDir::SortFlags .
[override virtual]
void
QDirModel::
sort
(
int
column
,
Qt::SortOrder
order
= Qt::AscendingOrder)
重实现自 QAbstractItemModel::sort ().
Sort the model items in the column 使用 order given. The order is a value defined in Qt::SortOrder .
Returns the sorting method used for the directory model.
另请参阅 setSorting () 和 QDir::SortFlags .
[override virtual]
Qt::DropActions
QDirModel::
supportedDropActions
() const
重实现自 QAbstractItemModel::supportedDropActions ().
返回由此模型支持的掉落动作。
另请参阅 Qt::DropActions .