Qt.labs.folderlistmodel.FolderListModel

The FolderListModel provides a model of the contents of a file system folder. More...

Import Statement: import Qt.labs.folderlistmodel 2.1

Properties

Methods

  • var get(int index, string property)
  • bool isFolder(int index)

Detailed Description

FolderListModel provides access to information about the contents of a folder in the local file system, exposing a list of files to views and other data components.

Note: This type is made available by importing the Qt.labs.folderlistmodel module. Elements in the Qt.labs module are not guaranteed to remain compatible in future versions.

import Qt.labs.folderlistmodel 2.1

The folder property specifies the folder to access. Information about the files and directories in the folder is supplied via the model's interface. Components access names and paths via the following roles:

  • fileName
  • filePath
  • fileURL (since Qt 5.2)
  • fileBaseName
  • fileSuffix
  • fileSize
  • fileModified
  • fileAccessed
  • fileIsDir

Additionally a file entry can be differentiated from a folder entry via the isFolder() method.

Filtering

Various properties can be set to filter the number of files and directories exposed by the model.

The nameFilters property can be set to contain a list of wildcard filters that are applied to names of files and directories, causing only those that match the filters to be exposed.

Directories can be included or excluded using the showDirs property, navigation directories can also be excluded by setting the showDotAndDotDot property to false, hidden files can be included or excluded using the showHidden property.

It is sometimes useful to limit the files and directories exposed to those that the user can access. The showOnlyReadable property can be set to enable this feature.

Example Usage

The following example shows a FolderListModel being used to provide a list of QML files in a ListView:

import QtQuick 2.0
import Qt.labs.folderlistmodel 2.1
ListView {
width: 200; height: 400
FolderListModel {
id: folderModel
nameFilters: [".qml"]
}
Component {
id: fileDelegate
Text { text: fileName }
}
model: folderModel
delegate: fileDelegate
}

Path Separators

Qt uses "/" as a universal directory separator in the same way that "/" is used as a path separator in URLs. If you always use "/" as a directory separator, Qt will translate your paths to conform to the underlying operating system.

See also QML Data Models.

Property Documentation

count : int

Returns the number of items in the current folder that match the filter criteria.


folder : string

The folder property holds a URL for the folder that the model is currently providing.

The value must be a file: or qrc: URL, or a relative URL.

By default, the value is an invalid URL.


nameFilters : list<string>

The nameFilters property contains a list of file name filters. The filters may include the ? and * wildcards.

The example below filters on PNG and JPEG files:

FolderListModel {
nameFilters: [ ".png", "*.jpg" ]
}

Note: Directories are not excluded by filters.


parentFolder : url

Returns the URL of the parent of the current folder.


rootFolder : url

When the rootFolder is set, then this folder will be threated as the root in the file system, so that you can only travers sub folders from this rootFolder.


showDirs : bool

If true, directories are included in the model; otherwise only files are included.

By default, this property is true.

Note that the nameFilters are not applied to directories.

See also showDotAndDotDot.


showDirsFirst : bool

If true, if directories are included in the model they will always be shown first, then the files.

By default, this property is false.


showDotAndDotDot : bool

If true, the "." and ".." directories are included in the model; otherwise they are excluded.

By default, this property is false.

See also showDirs.


showFiles : bool

If true, files are included in the model; otherwise only directories are included.

By default, this property is true.

This QML property was introduced in Qt 5.2.

See also showDirs.


showHidden : bool

If true, hidden files and directories are included in the model; otherwise they are excluded.

By default, this property is false.

This QML property was introduced in Qt 5.2.


showOnlyReadable : bool

If true, only readable files and directories are shown; otherwise all files and directories are shown.

By default, this property is false.

See also showDirs.


sortField : enumeration

The sortField property contains field to use for sorting. sortField may be one of:

  • Unsorted - no sorting is applied.
  • Name - sort by filename
  • Time - sort by time modified
  • Size - sort by file size
  • Type - sort by file type (extension)

See also sortReversed.


sortReversed : bool

If set to true, reverses the sort order. The default is false.

See also sortField.


Method Documentation

var get(int index, string property)

Get the folder property for the given index. The following properties are available.

  • fileName
  • filePath
  • fileURL (since Qt 5.2)
  • fileBaseName
  • fileSuffix
  • fileSize
  • fileModified
  • fileAccessed
  • fileIsDir

bool isFolder(int index)

Returns true if the entry index is a folder; otherwise returns false.


  翻译：