QFileDialog Class Reference
^{[QtGui module]}

Detailed Description

The QFileDialog class provides a dialog that allow users to select files or directories.

The QFileDialog class enables a user to traverse the file system in order to select one or many files or a directory.

The easiest way to create a QFileDialog is to use the static functions. On Windows, these static functions will call the native Windows file dialog, and on Mac OS X these static function will call the native Mac OS X file dialog.

    QString s = QFileDialog::getOpenFileName(
                    this,
                    "Choose a file",
                    "/home",
                    "Images (*.png *.xpm *.jpg)");

In the above example, a modal QFileDialog is created using a static function. The dialog initially displays the contents of the "/home" directory, and displays files matching the patterns given in the string "Images (*.png *.xpm *.jpg)". The parent of the file dialog is set to this, and the dialog is named "open file dialog". The caption at the top of file dialog is set to "Choose a file" instead of the default.

If you want to use multiple filters, separate each one with two semicolons. For example:

    "Images (*.png *.xpm *.jpg);;Text files (*.txt);;XML files (*.xml)"

You can create your own QFileDialog without using the static functions. By calling setMode(), you can specify what the user must select in the dialog:

      QFileDialog *fd = new QFileDialog(this);
      fd->setMode(QFileDialog::AnyFile);

In the above example, the mode of the file dialog is set to AnyFile, meaning that the user can select any file, or even specify a file that doesn't exist. This mode is useful for creating a "Save As" file dialog. Use ExistingFile if the user must select an existing file, or Directory if only a directory may be selected. See the QFileDialog::FileMode enum for the complete list of modes.

You can retrieve the dialog's mode with mode(). Use setFilter() to set the dialog's file filter. For example:

      fd->setFilter( "Images (*.png *.xpm *.jpg)" );

In the above example, the filter is set to "Images (*.png *.xpm *.jpg)", this means that only files with the extension png, xpm, or jpg will be shown in the QFileDialog. You can apply several filters by using setFilters(). Use selectFilter() to select one of the filters you've given as the file dialog's default filter.

The file dialog has two view modes: QFileDialog::List and QFileDialog::Detail. QFileDialog::List presents the contents of the current directory as a list of file and directory names. QFileDialog::Detail also displays a list of file and directory names, but provides additional information alongside each name, such as the file size and modification date. Set the mode with setViewMode().

      fd->setViewMode(QFileDialog::Detail);

The last important function you will need to use when creating your own file dialog is selectedFiles().

      QStringList fileNames;
      if (fileDialog->exec())
          fileNames = fileNames->selectedFiles();

In the above example, a modal file dialog is created and shown. If the user clicked OK, the file they selected is put in fileName.

The dialog's working directory can be set with setDirectory(). Each file in the current directory can be selected using the selectFile() function.

The Standard Dialogs example shows how to use QFileDialog as well as other built-in Qt dialogs.

Member Type Documentation

enum QFileDialog::AcceptMode

enum QFileDialog::DialogLabel

enum QFileDialog::FileMode

This enum is used to indicate what the user may select in the file dialog; i.e. what the dialog will return if the user clicks OK.

See also setFileMode().

typedef QFileDialog::Mode

Use QFileDialog::FileMode instead.

enum QFileDialog::Option
flags QFileDialog::Options

The Options type is a typedef for QFlags<Option>. It stores an OR combination of Option values.

enum QFileDialog::ViewMode

This enum describes the view mode of the file dialog; i.e. what information about each file will be displayed.

See also setViewMode().

Property Documentation

acceptMode : AcceptMode

This property holds the accept mode of the dialog.

The action mode defines whether the dialog is for opening or saving files.

Access functions:

• AcceptMode acceptMode () const
• void setAcceptMode ( AcceptMode mode )

See also AcceptMode.

confirmOverwrite : bool

This property holds whether the filedialog should ask before accepting a selected file, when the accept mode is AcceptSave.

If this property is set to true and the accept mode is AcceptSave, the filedialog will ask whether the user wants to overwrite the fike before accepting the file.

Access functions:

• bool confirmOverwrite () const
• void setConfirmOverwrite ( bool enabled )

defaultSuffix : QString

This property holds suffix added to the filename if no other suffix was specified.

This property specifies a string that will be added to the filename if it has no suffix already. The suffix is typically used to indicate the file type (e.g. "txt" indicates a text file).

Access functions:

• QString defaultSuffix () const
• void setDefaultSuffix ( const QString & suffix )

fileMode : FileMode

This property holds the file mode of the dialog.

The file mode defines the number and type of items that the user is expected to select in the dialog.

Access functions:

• FileMode fileMode () const
• void setFileMode ( FileMode mode )

See also FileMode.

readOnly : bool

This property holds wether the filedialog is readonly.

If this property is set to false, the filedialog will allow creating, renaming, copying and deleting files and directories.

Access functions:

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

resolveSymlinks : bool

This property holds whether the filedialog should resolve symbolic links.

If this property is set to true, the file dialog will resolve symbolic links.

Access functions:

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

viewMode : ViewMode

This property holds the way files and directories are displayed in the dialog.

By default, the Detail mode is used to display information about files and directories.

Access functions:

• ViewMode viewMode () const
• void setViewMode ( ViewMode mode )

See also ViewMode.

Member Function Documentation

QFileDialog::QFileDialog ( QWidget * parent, Qt::WFlags flags )

Constructs a file dialog with the given parent and widget flags.

QFileDialog::QFileDialog ( QWidget * parent = 0, const QString & caption = QString(), const QString & directory = QString(), const QString & filter = QString() )

Constructs a file dialog with the given parent and caption that initially displays the contents of the specified directory. The contents of the directory are filtered before being shown in the dialog, using a semicolon-separated list of filters specified by filter.

QFileDialog::~QFileDialog ()

void QFileDialog::currentChanged ( const QString & path )   [signal]

When the current file changes, this signal is emitted with the new file name as the path parameter.

See also filesSelected().

QDir QFileDialog::directory () const

Returns the directory currently being displayed in the dialog.

See also setDirectory().

void QFileDialog::filesSelected ( const QStringList & selected )   [signal]

When the selection changes, this signal is emitted with the (possibly empty) list of selected files.

See also currentChanged().

QStringList QFileDialog::filters () const

Returns the file type filters that are in operation on this file dialog.

See also setFilters().

QString QFileDialog::getExistingDirectory ( QWidget * parent = 0, const QString & caption = QString(), const QString & dir = QString(), Options options = ShowDirsOnly )   [static]

This is a convenience static function that will return an existing directory selected by the user.

    QString s = QFileDialog::getExistingDirectory(
                    this,
                    "Choose a directory",
                    "/home",
                    DontResolveSymlinks);

This function creates a modal file dialog with the given parent widget. If the parent is not 0, the dialog will be shown centered over the parent widget.

The dialog's working directory is set to dir, and the caption is set to caption. Either of these may be an empty string in which case the current directory and a default caption will be used respectively. The options argument holds various options about how to run the dialog, see the QFileDialog::Option enum for more information on the flags you can pass.

Under Unix/X11, the normal behavior of the file dialog is to resolve and follow symlinks. For example, if /usr/tmp is a symlink to /var/tmp, the file dialog will change to /var/tmp after entering /usr/tmp. If options includes DontResolveSymlinks, the file dialog will treat symlinks as regular directories.

Note that on Windows the dialog will spin a blocking modal event loop that will not dispatch any QTimers, and if parent is not 0 then it will position the dialog just under the parent's title bar.

See also getOpenFileName(), getOpenFileNames(), and getSaveFileName().

QString QFileDialog::getOpenFileName ( QWidget * parent = 0, const QString & caption = QString(), const QString & dir = QString(), const QString & filter = QString(), QString * selectedFilter = 0, Options options = 0 )   [static]

This is a convenience static function that returns an existing file selected by the user. If the user presses Cancel, it returns a null string.

    QString s = QFileDialog::getOpenFileName(
                    this,
                    "Choose a file to open",
                    "/home",
                    "Images (*.png *.xpm *.jpg)");

The function creates a modal file dialog with the given parent widget. If the parent is not 0, the dialog will be shown centered over the parent widget.

The file dialog's working directory will be set to dir. If dir includes a file name, the file will be selected. Only files that match the given filter are shown. The filter selected is set to selectedFilter. The parameters dir, selectedFilter, and filter may be empty strings. The options argument holds various options about how to run the dialog, see the QFileDialog::Option enum for more information on the flags you can pass.

The dialog's caption is set to caption. If caption is not specified then a default caption will be used.

Under Windows and Mac OS X, this static function will use the native file dialog and not a QFileDialog.

Note that on Windows the dialog will spin a blocking modal event loop that will not dispatch any QTimers, and if parent is not 0 then it will position the dialog just under the parent's title bar.

Under Unix/X11, the normal behavior of the file dialog is to resolve and follow symlinks. For example, if /usr/tmp is a symlink to /var/tmp, the file dialog will change to /var/tmp after entering /usr/tmp. If options includes DontResolveSymlinks, the file dialog will treat symlinks as regular directories.

See also getOpenFileNames(), getSaveFileName(), and getExistingDirectory().

QStringList QFileDialog::getOpenFileNames ( QWidget * parent = 0, const QString & caption = QString(), const QString & dir = QString(), const QString & filter = QString(), QString * selectedFilter = 0, Options options = 0 )   [static]

This is a convenience static function that will return one or more existing files selected by the user.

    QStringList files = QFileDialog::getOpenFileNames(
                            this,
                            "Select one or more files to open",
                            "/home",
                            "Images (*.png *.xpm *.jpg)");

This function creates a modal file dialog with the given parent widget. If the parent is not 0, the dialog will be shown centered over the parent widget.

The file dialog's working directory will be set to dir. If dir includes a file name, the file will be selected. The filter is set to filter so that only those files which match the filter are shown. The filter selected is set to selectedFilter. The parameters dir, selectedFilter and filter may be empty strings.

The dialog's caption is set to caption. If caption is not specified then a default caption will be used.

Under Windows and Mac OS X, this static function will use the native file dialog and not a QFileDialog.

Note that on Windows the dialog will spin a blocking modal event loop that will not dispatch any QTimers, and if parent is not 0 then it will position the dialog just under the parent's title bar.

Under Unix/X11, the normal behavior of the file dialog is to resolve and follow symlinks. For example, if /usr/tmp is a symlink to /var/tmp, the file dialog will change to /var/tmp after entering /usr/tmp. The options argument holds various options about how to run the dialog, see the QFileDialog::Option enum for more information on the flags you can pass.

Note that if you want to iterate over the list of files, you should iterate over a copy. For example:

    QStringList list = files;
    QStringList::Iterator it = list.begin();
    while(it != list.end()) {
        myProcessing(*it);
        ++it;
    }

See also getOpenFileName(), getSaveFileName(), and getExistingDirectory().

QString QFileDialog::getSaveFileName ( QWidget * parent = 0, const QString & caption = QString(), const QString & dir = QString(), const QString & filter = QString(), QString * selectedFilter = 0, Options options = 0 )   [static]

This is a convenience static function that will return a file name selected by the user. The file does not have to exist.

It creates a modal file dialog with the given parent widget. If the parent is not 0, the dialog will be shown centered over the parent widget.

    QString s = QFileDialog::getSaveFileName(
                    this,
                    "Choose a filename to save under",
                    "/home",
                    "Images (*.png *.xpm *.jpg)");

The file dialog's working directory will be set to dir. If dir includes a file name, the file will be selected. Only files that match the filter are shown. The filter selected is set to selectedFilter. The parameters dir, selectedFilter, and filter may be empty strings. The options argument holds various options about how to run the dialog, see the QFileDialog::Option enum for more information on the flags you can pass.

The dialog's caption is set to caption. If caption is not specified then a default caption will be used.

Under Windows and Mac OS X, this static function will use the native file dialog and not a QFileDialog.

Note that on Windows the dialog will spin a blocking modal event loop that will not dispatch any QTimers, and if parent is not 0 then it will position the dialog just under the parent's title bar. On Mac OS X, the filter argument is ignored.

Under Unix/X11, the normal behavior of the file dialog is to resolve and follow symlinks. For example, if /usr/tmp is a symlink to /var/tmp, the file dialog will change to /var/tmp after entering /usr/tmp. If options includes DontResolveSymlinks, the file dialog will treat symlinks as regular directories.

See also getOpenFileName(), getOpenFileNames(), and getExistingDirectory().

QStringList QFileDialog::history () const

returns the browsing history of the filedialog as a list of paths.

See also setHistory().

QFileIconProvider * QFileDialog::iconProvider () const

returns the icon provider used by the filedialog.

See also setIconProvider().

QAbstractItemDelegate * QFileDialog::itemDelegate () const

returns the item delegate used to render the items in the views in the filedialog

See also setItemDelegate().

QString QFileDialog::labelText ( DialogLabel label ) const

returns the text shown in the filedialog in the specified label

See also setLabelText().

void QFileDialog::selectFile ( const QString & filename )

Selects the given filename in both the file dialog.

void QFileDialog::selectFilter ( const QString & filter )

Sets the current file type filter. Multiple filters can be passed in filter by separating them with semicolons or spaces.

See also setFilter() and setFilters().

QStringList QFileDialog::selectedFiles () const

Returns a list of strings containing the absolute paths of the selected files in the dialog. If no files are selected, or the mode is not ExistingFiles, selectedFiles() is an empty string list.

See also selectedFilter().

QString QFileDialog::selectedFilter () const

Returns the filter that the user selected in the file dialog.

See also selectedFiles().

void QFileDialog::setDirectory ( const QString & directory )

Sets the file dialog's current directory.

See also directory().

void QFileDialog::setDirectory ( const QDir & directory )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

void QFileDialog::setFilter ( const QString & filter )

Sets the filter used in the file dialog to the given filter.

If filter contains a pair of parentheses containing one or more of anything*something, separated by spaces or by semicolons then only the text contained in the parentheses is used as the filter. This means that these calls are all equivalent:

    fd->setFilter("All C++ files (*.cpp *.cc *.C *.cxx *.c++)");
    fd->setFilter("*.cpp *.cc *.C *.cxx *.c++");
    fd->setFilter("All C++ files (*.cpp;*.cc;*.C;*.cxx;*.c++)");
    fd->setFilter("*.cpp;*.cc;*.C;*.cxx;*.c++");

See also setFilters().

void QFileDialog::setFilters ( const QStringList & filters )

Sets the filters used in the file dialog.

    QStringList types;
    types << "Image files (*.png *.xpm *.jpg)"
              << "Text files (*.txt)"
              << "Any files (*)";
    QFileDialog fd = new QFileDialog( this );
    fd->setFilters( types );
    fd->show();

See also filters().

void QFileDialog::setHistory ( const QStringList & paths )

Sets the browsing history of the filedialog to contain the given paths.

See also history().

void QFileDialog::setIconProvider ( QFileIconProvider * provider )

set the icon provider used by the filedialog to the specified provider

See also iconProvider().

void QFileDialog::setItemDelegate ( QAbstractItemDelegate * delegate )

set the item delegate used to render the items in the views in the filedialog to the specified delegate

See also itemDelegate().

void QFileDialog::setLabelText ( DialogLabel label, const QString & text )

set the text shown in the filedialog in the specified label

See also labelText().