内容

• 公共类型
• 特性
• 公共函数
• 重实现公共函数
• 公共槽
• 信号
• 静态公共成员
• 保护函数
• 重实现保护函数
• 详细描述
• Creating and using preview widgets

Q3FileDialog Class

The Q3FileDialog class provides dialogs that allow users to select files or directories. 更多...

头：	#include <Q3FileDialog>
继承：	QDialog

• 所有成员列表，包括继承成员

公共类型

enum	Mode { AnyFile, ExistingFile, Directory, DirectoryOnly, ExistingFiles }
enum	PreviewMode { NoPreview, Contents, Info }
enum	ViewMode { List, Detail }

特性

contentsPreview : bool dirPath : const QString infoPreview : bool mode : Mode previewMode : PreviewMode

selectedFile : const QString selectedFiles : const QStringList selectedFilter : const QString showHiddenFiles : bool viewMode : ViewMode

• 2 特性继承自 QDialog
• 58 特性继承自 QWidget
• 1 特性继承自 QObject

公共函数

	Q3FileDialog (const QString & dirName , const QString & filter = QString(), QWidget * parent = 0, const char * name = 0, bool modal = false)
	Q3FileDialog (QWidget * parent = 0, const char * name = 0, bool modal = false)
	~Q3FileDialog ()
void	addFilter (const QString & filter )
const QDir *	dir () const
QString	dirPath () const
bool	isContentsPreviewEnabled () const
bool	isInfoPreviewEnabled () const
模式	mode () const
PreviewMode	previewMode () const
void	rereadDir ()
void	resortDir ()
void	selectAll (bool b )
QString	selectedFile () const
QStringList	selectedFiles () const
QString	selectedFilter () const
void	setContentsPreview (QWidget * w , Q3FilePreview * preview )
void	setContentsPreviewEnabled (bool)
void	setDir (const QDir & dir )
void	setInfoPreview (QWidget * w , Q3FilePreview * preview )
void	setInfoPreviewEnabled (bool)
void	setMode (Mode)
void	setPreviewMode (PreviewMode m )
virtual void	setSelectedFilter (const QString & mask )
virtual void	setSelectedFilter (int n )
void	setSelection (const QString & filename )
void	setShowHiddenFiles (bool s )
void	setViewMode (ViewMode m )
bool	showHiddenFiles () const
Q3Url	url () const
ViewMode	viewMode () const

重实现公共函数

virtual bool

eventFilter (QObject * o , QEvent * e )

• 8 公共函数继承自 QDialog
• 220 公共函数继承自 QWidget
• 29 公共函数继承自 QObject
• 12 公共函数继承自 QPaintDevice

公共槽

virtual void	done (int i )
void	setDir (const QString & pathstr )
void	setFilter (const QString & newFilter )
void	setFilters (const QString & filters )
void	setFilters (const char ** 类型 )
void	setFilters (const QStringList & 类型 )
void	setUrl (const Q3UrlOperator & url )

• 5 公共槽继承自 QDialog
• 19 公共槽继承自 QWidget
• 1 公共槽继承自 QObject

信号

void	dirEntered (const QString & directory )
void	fileHighlighted (const QString & file )
void	fileSelected (const QString & file )
void	filesSelected (const QStringList & 文件 )
void	filterSelected (const QString & filter )

• 3 信号继承自 QDialog
• 1 信号继承自 QWidget
• 1 信号继承自 QObject

静态公共成员

QString	getExistingDirectory (const QString & dir = QString(), QWidget * parent = 0, const char * name = 0, const QString & caption = QString(), bool dirOnly = true, bool resolveSymlinks = true)
QString	getOpenFileName (const QString & startWith = QString(), const QString & filter = QString(), QWidget * parent = 0, const char * name = 0, const QString & caption = QString(), QString * selectedFilter = 0, bool resolveSymlinks = true)
QStringList	getOpenFileNames (const QString & filter = QString(), const QString & dir = QString(), QWidget * parent = 0, const char * name = 0, const QString & caption = QString(), QString * selectedFilter = 0, bool resolveSymlinks = true)
QString	getSaveFileName (const QString & startWith = QString(), const QString & filter = QString(), QWidget * parent = 0, const char * name = 0, const QString & caption = QString(), QString * selectedFilter = 0, bool resolveSymlinks = true)
Q3FileIconProvider *	iconProvider ()
void	setIconProvider (Q3FileIconProvider * provider )

• 4 static public members inherited from QWidget
• 7 静态公共成员继承自 QObject

保护函数

void	addLeftWidget (QWidget * w )
void	addRightWidget (QWidget * w )
void	addToolButton (QAbstractButton * b , bool separator = false)
void	addWidgets (QLabel * l , QWidget * w , QPushButton * b )

重实现保护函数

virtual void	keyPressEvent (QKeyEvent * ke )
virtual void	resizeEvent (QResizeEvent * e )

• 7 protected functions inherited from QDialog
• 37 保护函数继承自 QWidget
• 8 保护函数继承自 QObject
• 1 保护函数继承自 QPaintDevice

额外继承成员

• 1 保护槽继承自 QWidget

详细描述

The Q3FileDialog class provides dialogs that allow users to select files or directories.

The Q3FileDialog class enables a user to traverse their file system in order to select one or many files or a directory.

最轻松方式创建 Q3FileDialog 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 = Q3FileDialog::getOpenFileName(
                "/home",
                "Images (*.png *.xpm *.jpg)",
                this,
                "open file dialog",
                "Choose a file");
					

在以上范例中，模态 Q3FileDialog is created using a static function. The startup directory is set to "/home". The file filter is set to "Images (*.png *.xpm *.jpg)". The parent of the file dialog is set to this and it is given the identification name - "open file dialog". The caption at the top of file dialog is set to "Choose a file". If you want to use multiple filters, separate each one with two semicolons, e.g.

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

可以创建自己的 Q3FileDialog 无需使用静态函数。通过调用 setMode (), you can set what can be returned by the Q3FileDialog .

Q3FileDialog* fd = new Q3FileDialog(this, "file dialog", true);
fd->setMode(Q3FileDialog::AnyFile);
					

在以上范例中，文件对话框的模式被设为 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 "File 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 Q3FileDialog::Mode enum for the complete list of modes.)

You can retrieve the dialog's mode with mode ()。使用 setFilter () to set the dialog's file filter, e.g.

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 将展示在 Q3FileDialog 。可以应用多个过滤器通过使用 setFilters () and add additional filters with addFilter ()。使用 setSelectedFilter () to select one of the filters you've given as the file dialog's default filter. Whenever the user changes the filter the filterSelected () 信号发射。

The file dialog has two view modes, Q3FileDialog::List which simply lists file and directory names and Q3FileDialog::Detail which displays additional information alongside each name, e.g. file size, modification date, etc. Set the mode with setViewMode ().

fd->setViewMode(Q3FileDialog::Detail);
					

当创建自己的文件对话框时需要使用的最后一个重要函数是 selectedFile ().

QString fileName;
if (fd->exec() == QDialog::Accepted)
    fileName = fd->selectedFile();
					

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

若正使用 ExistingFiles mode then you will need to use selectedFiles () which will return the selected files in a QStringList .

可以设置对话框的工作目录采用 setDir (). The display of hidden files is controlled with setShowHiddenFiles (). The dialog can be forced to re-read the directory with rereadDir () and re-sort the directory with resortDir (). All the files in the current directory can be selected with selectAll ().

Creating and using preview widgets

There are two kinds of preview widgets that can be used with Q3FileDialogs: content preview widgets and information preview widgets. They are created and used in the same way except that the function names differ, e.g. setContentsPreview () 和 setInfoPreview ().

A preview widget is a widget that is placed inside a Q3FileDialog so that the user can see either the contents of the file, or information about the file.

class Preview : public QLabel, public Q3FilePreview
{
public:
    Preview(QWidget *parent=0) : QLabel(parent) {}
    void previewUrl(const Q3Url &u)
    {
        QString path = u.path();
        QPixmap pix(path);
        if (pix.isNull())
            setText("This is not a pixmap");
        else
            setPixmap(pix);
    }
};
					

In the above snippet, we create a preview widget which inherits from QLabel and Q3FilePreview . File preview widgets must inherit from Q3FilePreview .

Inside the class we reimplement Q3FilePreview::previewUrl (), this is where we determine what happens when a file is selected. In the above example we only show a preview of the file if it is a valid pixmap. Here's how to make a file dialog use a preview widget:

Preview* p = new Preview;
Q3FileDialog* fd = new Q3FileDialog(this);
fd->setContentsPreviewEnabled(true);
fd->setContentsPreview(p, p);
fd->setPreviewMode(Q3FileDialog::Contents);
fd->show();
					

The first line creates an instance of our preview widget. We then create our file dialog and call setContentsPreviewEnabled (true), this tell the file dialog to preview the contents of the currently selected file. We then call setContentsPreview () -- note that we pass the same preview widget twice. Finally, before showing the file dialog, we call setPreviewMode () setting the mode to 内容 which will show the contents preview of the file that the user has selected.

If you create another preview widget that is used for displaying information about a file, create it in the same way as the contents preview widget and call setInfoPreviewEnabled ()，和 setInfoPreview (). Then the user will be able to switch between the two preview modes.

For more information about creating a Q3FilePreview widget see Q3FilePreview .

成员类型文档编制

enum Q3FileDialog:: Mode

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.

常量	值	描述
Q3FileDialog::AnyFile	0	文件的名称，无论它是否存在。
Q3FileDialog::ExistingFile	1	单个现有文件的名称。
Q3FileDialog::Directory	2	The name of a directory. Both files and directories are displayed.
Q3FileDialog::DirectoryOnly	4	The name of a directory. The file dialog will only display directories.
Q3FileDialog::ExistingFiles	3	零个或多个现有文件的名称。

见 setMode ().

enum Q3FileDialog:: PreviewMode

This enum describes the preview mode of the file dialog.

常量	值	描述
Q3FileDialog::NoPreview	0	No preview is shown at all.
Q3FileDialog::Contents	1	Show a preview of the contents of the current file using the contents preview widget.
Q3FileDialog::Info	2	Show information about the current file using the info preview widget.

见 setPreviewMode (), setContentsPreview () 和 setInfoPreview ().

enum Q3FileDialog:: ViewMode

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

常量	值	描述
Q3FileDialog::List	1	Display file and directory names with icons.
Q3FileDialog::Detail	0	Display file and directory names with icons plus additional information, such as file size and modification date.

见 setViewMode ().

特性文档编制

contentsPreview : bool

This property holds whether the file dialog can provide a contents preview of the currently selected file.

默认为 false。

访问函数：

bool	isContentsPreviewEnabled () const
void	setContentsPreviewEnabled (bool)

另请参阅 setContentsPreview () 和 setInfoPreviewEnabled ().

dirPath : const QString

This property holds the file dialog's working directory.

访问函数：

QString

dirPath () const

另请参阅 dir () 和 setDir ().

infoPreview : bool

This property holds whether the file dialog can provide preview information about the currently selected file.

默认为 false。

访问函数：

bool	isInfoPreviewEnabled () const
void	setInfoPreviewEnabled (bool)

mode : Mode

This property holds the file dialog's mode.

默认模式为 ExistingFile .

访问函数：

模式	mode () const
void	setMode (Mode)

previewMode : PreviewMode

This property holds the preview mode for the file dialog.

If you set the mode to be a mode other than NoPreview , you must use setInfoPreview () 或 setContentsPreview () to set the dialog's preview widget to your preview widget and enable the preview widget(s) with setInfoPreviewEnabled () 或 setContentsPreviewEnabled ().

访问函数：

PreviewMode	previewMode () const
void	setPreviewMode (PreviewMode m )

另请参阅 infoPreview , contentsPreview ，和 viewMode .

selectedFile : const QString

This property holds the name of the selected file.

If a file was selected selectedFile contains the file's name including its absolute path; otherwise selectedFile is empty.

访问函数：

QString

selectedFile () const

另请参阅 QString::isEmpty (), selectedFiles ，和 selectedFilter .

selectedFiles : const QStringList

This property holds the list of selected files.

If one or more files are selected, selectedFiles contains their names including their absolute paths. If no files are selected or the mode isn't ExistingFiles selectedFiles is an empty list.

It is more convenient to use selectedFile () if the mode is ExistingFile , Directory or DirectoryOnly .

Note that if you want to iterate over the list, you should iterate over a copy, e.g.

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

访问函数：

QStringList

selectedFiles () const

另请参阅 selectedFile , selectedFilter ，和 QList::isEmpty ().

selectedFilter : const QString

This property holds the filter which the user has selected in the file dialog.

访问函数：

QString

selectedFilter () const

另请参阅 filterSelected (), selectedFiles ，和 selectedFile .

showHiddenFiles : bool

This property holds whether hidden files are shown in the file dialog.

The default is false, i.e. don't show hidden files.

访问函数：

bool	showHiddenFiles () const
void	setShowHiddenFiles (bool s )

viewMode : ViewMode

This property holds the file dialog's view mode.

If you set the view mode to be Detail (the default), then you will see the file's details, such as the size of the file and the date the file was last modified in addition to the file's name.

If you set the view mode to be List , then you will just see a list of the files and folders.

见 Q3FileDialog::ViewMode

访问函数：

ViewMode	viewMode () const
void	setViewMode (ViewMode m )

成员函数文档编制

Q3FileDialog:: Q3FileDialog (const QString & dirName , const QString & filter = QString(), QWidget * parent = 0, const char * name = 0, bool modal = false)

Constructs a file dialog called name with the parent, parent 。若 modal is true then the file dialog is modal; otherwise it is modeless.

若 dirName is specified then it will be used as the dialog's working directory, i.e. it will be the directory that is shown when the dialog appears. If filter is specified it will be used as the dialog's file filter.

Q3FileDialog:: Q3FileDialog ( QWidget * parent = 0, const char * name = 0, bool modal = false)

Constructs a file dialog called name , with the parent, parent 。若 modal is true then the file dialog is modal; otherwise it is modeless.

Q3FileDialog:: ~Q3FileDialog ()

销毁文件对话框。

void Q3FileDialog:: addFilter (const QString & filter )

Adds the filter filter to the list of filters and makes it the current filter.

Q3FileDialog* fd = new Q3FileDialog(this);
fd->addFilter("Images (*.png *.jpg *.xpm)");
fd->show();
					

In the above example, a file dialog is created, and the file filter "Images (*.png *.jpg *.xpm)" is added and is set as the current filter. The original filter, "All Files (*)", is still available.

另请参阅 setFilter () 和 setFilters ().

[protected] void Q3FileDialog:: addLeftWidget ( QWidget * w )

Adds the widget w to the left-hand side of the file dialog.

另请参阅 addRightWidget (), addWidgets ()，和 addToolButton ().

[protected] void Q3FileDialog:: addRightWidget ( QWidget * w )

Adds the widget w to the right-hand side of the file dialog.

另请参阅 addLeftWidget (), addWidgets ()，和 addToolButton ().

[protected] void Q3FileDialog:: addToolButton ( QAbstractButton * b , bool separator = false)

Adds the tool button b to the row of tool buttons at the top of the file dialog. The button is appended to the right of this row. If separator is true, a small space is inserted between the last button of the row and the new button b .

另请参阅 addWidgets (), addLeftWidget ()，和 addRightWidget ().

[protected] void Q3FileDialog:: addWidgets ( QLabel * l , QWidget * w , QPushButton * b )

Adds the specified widgets to the bottom of the file dialog. The label l is placed underneath the "file name" and the "file types" labels. The widget w is placed underneath the file types combobox. The button b is placed underneath the Cancel push button.

MyFileDialog::MyFileDialog(QWidget* parent, const char* name) :
    Q3FileDialog(parent, name)
{
    QLabel* label = new QLabel("Added widgets", this);
    QLineEdit* lineedit = new QLineEdit(this);
    QPushButton* pushbutton = new QPushButton(this);
    addWidgets(label, lineedit, pushbutton);
}
					

If you don't want to have one of the widgets added, pass 0 in that widget's position.

Every time you call this function, a new row of widgets will be added to the bottom of the file dialog.

另请参阅 addToolButton (), addLeftWidget ()，和 addRightWidget ().

const QDir * Q3FileDialog:: dir () const

Returns the current directory shown in the file dialog.

The ownership of the QDir pointer is transferred to the caller, so it must be deleted by the caller when no longer required.

另请参阅 setDir ().

[signal] void Q3FileDialog:: dirEntered (const QString & directory )

This signal is emitted when the user enters the given directory .

另请参阅 dir ().

[virtual slot] void Q3FileDialog:: done ( int i )

重实现自 QDialog::done ().

[虚拟] bool Q3FileDialog:: eventFilter ( QObject * o , QEvent * e )

重实现自 QObject::eventFilter ().

[signal] void Q3FileDialog:: fileHighlighted (const QString & file )

This signal is emitted when the user highlights the given file , i.e. makes it the current file.

注意： 信号 fileHighlighted 在此类中是重载。要使用函数指针句法连接到此信号，必须在静态铸造中指定信号类型，如此范例所示：

connect(3FileDialog, static_cast<void(Q3FileDialog::*)(const QString &)>(&Q3FileDialog::fileHighlighted),
    [=](const QString &file){ /* ... */ });
					

另请参阅 fileSelected () 和 filesSelected ().

[signal] void Q3FileDialog:: fileSelected (const QString & file )

This signal is emitted when the user selects the given file .

注意： 信号 fileSelected 在此类中是重载。要使用函数指针句法连接到此信号，必须在静态铸造中指定信号类型，如此范例所示：

connect(3FileDialog, static_cast<void(Q3FileDialog::*)(const QString &)>(&Q3FileDialog::fileSelected),
    [=](const QString &file){ /* ... */ });
					

另请参阅 filesSelected (), fileHighlighted ()，和 selectedFile ().

[signal] void Q3FileDialog:: filesSelected (const QStringList & 文件 )

This signal is emitted when the user selects the given 文件 in ExistingFiles 模式。

另请参阅 fileSelected (), fileHighlighted ()，和 selectedFiles ().

[signal] void Q3FileDialog:: filterSelected (const QString & filter )

This signal is emitted when the user selects the given filter .

另请参阅 selectedFilter ().

[static] QString Q3FileDialog:: getExistingDirectory (const QString & dir = QString(), QWidget * parent = 0, const char * name = 0, const QString & caption = QString(), bool dirOnly = true, bool resolveSymlinks = true)

这是将返回由用户选择的现有目录的方便静态函数。

QString s = Q3FileDialog::getExistingDirectory(
                "/home",
                this,
                "get existing directory",
                "Choose a directory",
                true);
					

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

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.

若 dirOnly is true, then only directories will be shown in the file dialog; otherwise both directories and files will be shown.

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 resolveSymlinks is false, 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.

另请参阅 getOpenFileName (), getOpenFileNames ()，和 getSaveFileName ().

[static] QString Q3FileDialog:: getOpenFileName (const QString & startWith = QString(), const QString & filter = QString(), QWidget * parent = 0, const char * name = 0, const QString & caption = QString(), QString * selectedFilter = 0, bool resolveSymlinks = true)

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

QString s = Q3FileDialog::getOpenFileName(
                "/home",
                "Images (*.png *.xpm *.jpg)",
                this,
                "open file dialog",
                "Choose a file to open");
					

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

文件对话框的工作目录将被设为 startWith 。若 startWith 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 。参数 startWith , selectedFilter and filter may be an empty string.

把对话框标题设为 caption 。若 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 Q3FileDialog , unless the style of the application is set to something other than the native style (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 resolveSymlinks is false, the file dialog will treat symlinks as regular directories.

另请参阅 getOpenFileNames (), getSaveFileName ()，和 getExistingDirectory ().

[static] QStringList Q3FileDialog:: getOpenFileNames (const QString & filter = QString(), const QString & dir = QString(), QWidget * parent = 0, const char * name = 0, const QString & caption = QString(), QString * selectedFilter = 0, bool resolveSymlinks = true)

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

QStringList files = Q3FileDialog::getOpenFileNames(
                        "Images (*.png *.xpm *.jpg)",
                        "/home",
                        this,
                        "open files dialog",
                        "Select one or more files to open");
					

This function creates a modal file dialog called name ，采用父级 parent 。若 parent is not 0, the dialog will be shown centered over the parent.

文件对话框的工作目录将被设为 dir 。若 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 。参数 dir , selectedFilter and filter may be empty strings.

把对话框标题设为 caption 。若 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 Q3FileDialog , unless the style of the application is set to something other than the native style. (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 resolveSymlinks is false, the file dialog will treat symlinks as regular directories.

Note that if you want to iterate over the list of files, you should iterate over a copy, e.g.

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

另请参阅 getOpenFileName (), getSaveFileName ()，和 getExistingDirectory ().

[static] QString Q3FileDialog:: getSaveFileName (const QString & startWith = QString(), const QString & filter = QString(), QWidget * parent = 0, const char * name = 0, const QString & caption = QString(), QString * selectedFilter = 0, bool resolveSymlinks = true)

这是将返回用户选择文件名的方便静态函数。文件不必存在。

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

QString s = Q3FileDialog::getSaveFileName(
                "/home",
                "Images (*.png *.xpm *.jpg)",
                this,
                "save file dialog",
                "Choose a filename to save under");
					

文件对话框的工作目录将被设为 startWith 。若 startWith 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 。参数 startWith , selectedFilter and filter may be an empty string.

把对话框标题设为 caption 。若 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 Q3FileDialog , unless the style of the application is set to something other than the native style. (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. And on the Mac 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 resolveSymlinks is false, the file dialog will treat symlinks as regular directories.

另请参阅 getOpenFileName (), getOpenFileNames ()，和 getExistingDirectory ().

[static] Q3FileIconProvider * Q3FileDialog:: iconProvider ()

Returns a pointer to the icon provider currently set on the file dialog. By default there is no icon provider, and this function returns 0.

另请参阅 setIconProvider () 和 Q3FileIconProvider .

[virtual protected] void Q3FileDialog:: keyPressEvent ( QKeyEvent * ke )

重实现自 QWidget::keyPressEvent ().

void Q3FileDialog:: rereadDir ()

Rereads the current directory shown in the file dialog.

The only time you will need to call this function is if the contents of the directory change and you wish to refresh the file dialog to reflect the change.

另请参阅 resortDir ().

[virtual protected] void Q3FileDialog:: resizeEvent ( QResizeEvent * e )

重实现自 QWidget::resizeEvent ().

void Q3FileDialog:: resortDir ()

Re-sorts the displayed directory.

另请参阅 rereadDir ().

void Q3FileDialog:: selectAll ( bool b )

若 b is true then all the files in the current directory are selected; otherwise, they are deselected.

void Q3FileDialog:: setContentsPreview ( QWidget * w , Q3FilePreview * preview )

Sets the widget to be used for displaying the contents of the file to the widget w and a preview of those contents to the Q3FilePreview preview .

Normally you would create a preview widget that derives from both QWidget and Q3FilePreview , so you should pass the same widget twice.

class Preview : public QLabel, public Q3FilePreview
{
public:
    Preview(QWidget *parent=0) : QLabel(parent) {}
    void previewUrl(const Q3Url &u)
    {
        QString path = u.path();
        QPixmap pix(path);
        if (pix.isNull())
            setText("This is not a pixmap");
        else
            setPixmap(pix);
    }
};
//...
int main(int argc, char** argv)
{
    Preview* p = new Preview;
    Q3FileDialog* fd = new Q3FileDialog(this);
    fd->setContentsPreviewEnabled(true);
    fd->setContentsPreview(p, p);
    fd->setPreviewMode(Q3FileDialog::Contents);
    fd->show();
}
					

另请参阅 setContentsPreviewEnabled (), setInfoPreview ()，和 setPreviewMode ().

void Q3FileDialog:: setDir (const QDir & dir )

Sets the file dialog's working directory to dir .

另请参阅 dir ().

[slot] void Q3FileDialog:: setDir (const QString & pathstr )

这是重载函数。

Sets the file dialog's working directory to pathstr .

另请参阅 dir ().

[slot] void Q3FileDialog:: setFilter (const QString & newFilter )

Sets the filter used in the file dialog to newFilter .

若 newFilter 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++");
					

另请参阅 setFilters ().

[slot] void Q3FileDialog:: setFilters (const QString & filters )

Sets the filters used in the file dialog to filters . Each group of filters must be separated by ;; ( two semicolons).

QString types("Image files (*.png *.xpm *.jpg);;"
              "Text files (*.txt);;"
              "Any files (*)");
Q3FileDialog fd = new Q3FileDialog(this);
fd->setFilters(types);
fd->show();
					

[slot] void Q3FileDialog:: setFilters (const char ** 类型 )

这是重载函数。

类型 must be a null-terminated list of strings.

[slot] void Q3FileDialog:: setFilters (const QStringList & 类型 )

这是重载函数。

类型 is a list of filter strings.

[static] void Q3FileDialog:: setIconProvider ( Q3FileIconProvider * provider )

设置 Q3FileIconProvider used by the file dialog to provider .

The default is that there is no Q3FileIconProvider and Q3FileDialog just draws a folder icon next to each directory and nothing next to files.

另请参阅 Q3FileIconProvider and iconProvider ().

void Q3FileDialog:: setInfoPreview ( QWidget * w , Q3FilePreview * preview )

Sets the widget to be used for displaying information about the file to the widget w and a preview of that information to the Q3FilePreview preview .

Normally you would create a preview widget that derives from both QWidget and Q3FilePreview , so you should pass the same widget twice.

class Preview : public QLabel, public Q3FilePreview
{
public:
    Preview(QWidget *parent=0) : QLabel(parent) {}
    void previewUrl(const Q3Url &u)
    {
        QString path = u.path();
        QPixmap pix(path);
        if (pix.isNull())
            setText("This is not a pixmap");
        else
            setText("This is a pixmap");
    }
};
//...
int main(int argc, char** argv)
{
    Preview* p = new Preview;
    Q3FileDialog* fd = new Q3FileDialog(this);
    fd->setInfoPreviewEnabled(true);
    fd->setInfoPreview(p, p);
    fd->setPreviewMode(Q3FileDialog::Info);
    fd->show();
}
					

另请参阅 setContentsPreview (), setInfoPreviewEnabled ()，和 setPreviewMode ().

[虚拟] void Q3FileDialog:: setSelectedFilter (const QString & mask )

Sets the current filter selected in the file dialog to the first one that contains the text mask .

另请参阅 selectedFilter ().

[虚拟] void Q3FileDialog:: setSelectedFilter ( int n )

这是重载函数。

Sets the current filter selected in the file dialog to the n -th filter in the filter list.

另请参阅 filterSelected (), selectedFilter (), selectedFiles ()，和 selectedFile ().

void Q3FileDialog:: setSelection (const QString & filename )

Sets the default selection to filename 。若 filename is absolute, setDir () is also called to set the file dialog's working directory to the filename's directory.

[slot] void Q3FileDialog:: setUrl (const Q3UrlOperator & url )

Sets the file dialog's working directory to the directory specified at url .

另请参阅 url ().

Q3Url Q3FileDialog:: url () const

Returns the URL of the current working directory in the file dialog.

另请参阅 setUrl ().