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GtkFileFilter

GtkFileFilter — A filter for selecting a file subset

Object Hierarchy

  GObject
   +----GInitiallyUnowned
         +----GtkObject
               +----GtkFileFilter

Description

A GtkFileFilter can be used to restrict the files being shown in a GtkFileChooser. Files can be filtered based on their name (with gtk_file_filter_add_pattern()), on their mime type (with gtk_file_filter_add_mime_type()), or by a custom filter function (with gtk_file_filter_add_custom()).

Filtering by mime types handles aliasing and subclassing of mime types; e.g. a filter for text/plain also matches a file with mime type application/rtf, since application/rtf is a subclass of text/plain. Note that GtkFileFilter allows wildcards for the subtype of a mime type, so you can e.g. filter for image/*.

Normally, filters are used by adding them to a GtkFileChooser, see gtk_file_chooser_add_filter(), but it is also possible to manually use a filter on a file with gtk_file_filter_filter().

Details

GtkFileFilter

typedef struct _GtkFileFilter GtkFileFilter;

The GtkFileFilter struct contains only private fields and should not be directly accessed.


GtkFileFilterInfo

typedef struct {
  GtkFileFilterFlags contains;

  const gchar *filename;
  const gchar *uri;
  const gchar *display_name;
  const gchar *mime_type;
} GtkFileFilterInfo;

A GtkFileFilterInfo struct is used to pass information about the tested file to gtk_file_filter_filter().

GtkFileFilterFlags contains;

Flags indicating which of the following fields need are filled

const gchar *filename;

the filename of the file being tested

const gchar *uri;

the URI for the file being tested

const gchar *display_name;

the string that will be used to display the file in the file chooser

const gchar *mime_type;

the mime type of the file

enum GtkFileFilterFlags

typedef enum {
  GTK_FILE_FILTER_FILENAME     = 1 << 0,
  GTK_FILE_FILTER_URI          = 1 << 1,
  GTK_FILE_FILTER_DISPLAY_NAME = 1 << 2,
  GTK_FILE_FILTER_MIME_TYPE    = 1 << 3
} GtkFileFilterFlags;

These flags indicate what parts of a GtkFileFilterInfo struct are filled or need to be filled.

GTK_FILE_FILTER_FILENAME

the filename of the file being tested

GTK_FILE_FILTER_URI

the URI for the file being tested

GTK_FILE_FILTER_DISPLAY_NAME

the string that will be used to display the file in the file chooser

GTK_FILE_FILTER_MIME_TYPE

the mime type of the file

GtkFileFilterFunc ()

gboolean            (*GtkFileFilterFunc)                (const GtkFileFilterInfo *filter_info,
                                                         gpointer data);

The type of function that is used with custom filters, see gtk_file_filter_add_custom().

filter_info :

a GtkFileFilterInfo that is filled according to the needed flags passed to gtk_file_filter_add_custom()

data :

user data passed to gtk_file_filter_add_custom()

Returns :

%TRUE if the file should be displayed

gtk_file_filter_new ()

GtkFileFilter *     gtk_file_filter_new                 (void);

Creates a new GtkFileFilter with no rules added to it. Such a filter doesn't accept any files, so is not particularly useful until you add rules with gtk_file_filter_add_mime_type(), gtk_file_filter_add_pattern(), or gtk_file_filter_add_custom(). To create a filter that accepts any file, use:

GtkFileFilter *filter = gtk_file_filter_new ();
gtk_file_filter_add_pattern (filter, "*");

Returns :

a new GtkFileFilter

Since 2.4


gtk_file_filter_set_name ()

void                gtk_file_filter_set_name            (GtkFileFilter *filter,
                                                         const gchar *name);

Sets the human-readable name of the filter; this is the string that will be displayed in the file selector user interface if there is a selectable list of filters.

filter :

a GtkFileFilter

name :

the human-readable-name for the filter, or NULL to remove any existing name.

Since 2.4


gtk_file_filter_get_name ()

const gchar *       gtk_file_filter_get_name            (GtkFileFilter *filter);

Gets the human-readable name for the filter. See gtk_file_filter_set_name().

filter :

a GtkFileFilter

Returns :

The human-readable name of the filter, or NULL. This value is owned by GTK+ and must not be modified or freed.

Since 2.4


gtk_file_filter_add_mime_type ()

void                gtk_file_filter_add_mime_type       (GtkFileFilter *filter,
                                                         const gchar *mime_type);

Adds a rule allowing a given mime type to filter.

filter :

A GtkFileFilter

mime_type :

name of a MIME type

Since 2.4


gtk_file_filter_add_pattern ()

void                gtk_file_filter_add_pattern         (GtkFileFilter *filter,
                                                         const gchar *pattern);

Adds a rule allowing a shell style glob to a filter.

filter :

a GtkFileFilter

pattern :

a shell style glob

Since 2.4


gtk_file_filter_add_pixbuf_formats ()

void                gtk_file_filter_add_pixbuf_formats  (GtkFileFilter *filter);

Adds a rule allowing image files in the formats supported by GdkPixbuf.

filter :

a GtkFileFilter

Since 2.6


gtk_file_filter_add_custom ()

void                gtk_file_filter_add_custom          (GtkFileFilter *filter,
                                                         GtkFileFilterFlags needed,
                                                         GtkFileFilterFunc func,
                                                         gpointer data,
                                                         GDestroyNotify notify);

Adds rule to a filter that allows files based on a custom callback function. The bitfield needed which is passed in provides information about what sorts of information that the filter function needs; this allows GTK+ to avoid retrieving expensive information when it isn't needed by the filter.

filter :

a GtkFileFilter

needed :

bitfield of flags indicating the information that the custom filter function needs.

func :

callback function; if the function returns TRUE, then the file will be displayed.

data :

data to pass to func

notify :

function to call to free data when it is no longer needed.

Since 2.4


gtk_file_filter_get_needed ()

GtkFileFilterFlags  gtk_file_filter_get_needed          (GtkFileFilter *filter);

Gets the fields that need to be filled in for the structure passed to gtk_file_filter_filter()

This function will not typically be used by applications; it is intended principally for use in the implementation of GtkFileChooser.

filter :

a GtkFileFilter

Returns :

bitfield of flags indicating needed fields when calling gtk_file_filter_filter()

Since 2.4


gtk_file_filter_filter ()

gboolean            gtk_file_filter_filter              (GtkFileFilter *filter,
                                                         const GtkFileFilterInfo *filter_info);

Tests whether a file should be displayed according to filter. The GtkFileFilterInfo structure filter_info should include the fields returned from gtk_file_filter_get_needed().

This function will not typically be used by applications; it is intended principally for use in the implementation of GtkFileChooser.

filter :

a GtkFileFilter

filter_info :

a GtkFileFilterInfo structure containing information about a file.

Returns :

TRUE if the file should be displayed

Since 2.4

See Also

GtkFileChooser