Back to Seed Clases

Gtk


Classes

Interfaces

Structs

Unions

Enums

Interface Gtk.FileChooser

Import line: Gtk = imports.gi.Gtk;
GIR File: Gtk-3.0.gir
C documentation: GtkFileChooser
Interface : FileChooser
Implementations: Gtk.FileChooserButton, Gtk.FileChooserDialog, Gtk.FileChooserWidget
GtkFileChooser is an interface that can be implemented by file
selection widgets. In GTK+, the main objects that implement this
interface are GtkFileChooserWidget, GtkFileChooserDialog, and
GtkFileChooserButton. You do not need to write an object that
implements the GtkFileChooser interface unless you are trying to
adapt an existing file selector to expose a standard programming
interface.
GtkFileChooser allows for shortcuts to various places in the filesystem.
In the default implementation these are displayed in the left pane. It
may be a bit confusing at first that these shortcuts come from various
sources and in various flavours, so lets explain the terminology here:


Bookmarks

are created by the user, by dragging folders from the
right pane to the left pane, or by using the "Add". Bookmarks
can be renamed and deleted by the user.



Shortcuts

can be provided by the application or by the underlying filesystem
abstraction (e.g. both the gnome-vfs and the Windows filesystems
provide "Desktop" shortcuts). Shortcuts cannot be modified by the
user.



Volumes

are provided by the underlying filesystem abstraction. They are
the "roots" of the filesystem.




File Names and Encodings
When the user is finished selecting files in a
GtkFileChooser, your program can get the selected names
either as filenames or as URIs. For URIs, the normal escaping
rules are applied if the URI contains non-ASCII characters.
However, filenames are always returned in
the character set specified by the
G_FILENAME_ENCODING environment variable.
Please see the Glib documentation for more details about this
variable.

This means that while you can pass the result of
gtk_file_chooser_get_filename() to
open(2) or
fopen(3), you may not be able to
directly set it as the text of a GtkLabel widget unless you
convert it first to UTF-8, which all GTK+ widgets expect.
You should use g_filename_to_utf8() to convert filenames
into strings that can be passed to GTK+ widgets.



Adding a Preview Widget

You can add a custom preview widget to a file chooser and then
get notification about when the preview needs to be updated.
To install a preview widget, use
gtk_file_chooser_set_preview_widget(). Then, connect to the
GtkFileChooser::update-preview signal to get notified when
you need to update the contents of the preview.


Your callback should use
gtk_file_chooser_get_preview_filename() to see what needs
previewing. Once you have generated the preview for the
corresponding file, you must call
gtk_file_chooser_set_preview_widget_active() with a boolean
flag that indicates whether your callback could successfully
generate a preview.


Sample Usage

{
GtkImage *preview;
...
preview = gtk_image_new ();
gtk_file_chooser_set_preview_widget (my_file_chooser, preview);
g_signal_connect (my_file_chooser, "update-preview",
G_CALLBACK (update_preview_cb), preview);
}
static void
update_preview_cb (GtkFileChooser *file_chooser, gpointer data)
{
GtkWidget *preview;
char *filename;
GdkPixbuf *pixbuf;
gboolean have_preview;
preview = GTK_WIDGET (data);
filename = gtk_file_chooser_get_preview_filename (file_chooser);
pixbuf = gdk_pixbuf_new_from_file_at_size (filename, 128, 128, NULL);
have_preview = (pixbuf != NULL);
g_free (filename);
gtk_image_set_from_pixbuf (GTK_IMAGE (preview), pixbuf);
if (pixbuf)
g_object_unref (pixbuf);
gtk_file_chooser_set_preview_widget_active (file_chooser, have_preview);
}




Adding Extra Widgets

You can add extra widgets to a file chooser to provide options
that are not present in the default design. For example, you
can add a toggle button to give the user the option to open a
file in read-only mode. You can use
gtk_file_chooser_set_extra_widget() to insert additional
widgets in a file chooser.


Sample Usage

GtkWidget *toggle;
...
toggle = gtk_check_button_new_with_label ("Open file read-only");
gtk_widget_show (toggle);
gtk_file_chooser_set_extra_widget (my_file_chooser, toggle);
}



If you want to set more than one extra widget in the file
chooser, you can a container such as a GtkVBox or a GtkTable
and include your widgets in it. Then, set the container as
the whole extra widget.



Key Bindings

Internally, GTK+ implements a file chooser's graphical user
interface with the private
GtkFileChooserDefaultClass. This
widget has several key
bindings and their associated signals. This section
describes the available key binding signals.


GtkFileChooser key binding example

The default keys that activate the key-binding signals in
GtkFileChooserDefaultClass are as
follows:





Signal name
Default key combinations


location-popup

ControlL (empty path);
/ (path of "/")

Both the individual / key and the
numeric keypad's "divide" key are supported.
;
~ (path of "~")



up-folder

AltUp;
AltShiftUp

Both the individual Up key and the numeric
keypad's Up key are supported.
;
Backspace



down-folder

AltDown;
AltShiftDown

Both the individual Down key and the numeric
keypad's Down key are supported.




home-folder
AltHome


desktop-folder
AltD


quick-bookmark
Alt1 through Alt0





You can change these defaults to something else. For
example, to add a Shift modifier to a few
of the default bindings, you can include the following
fragment in your .gtkrc-3.0 file:


binding "my-own-gtkfilechooser-bindings" {
bind "<Alt><Shift>Up" {
"up-folder" ()
}
bind "<Alt><Shift>Down" {
"down-folder" ()
}
bind "<Alt><Shift>Home" {
"home-folder" ()
}
}
class "GtkFileChooserDefault" binding "my-own-gtkfilechooser-bindings"



The "GtkFileChooserDefault::location-popup" signal

void user_function (GtkFileChooserDefault *chooser,
const char *path,
gpointer user_data);


This is used to make the file chooser show a "Location"
dialog which the user can use to manually type the name of
the file he wishes to select. The
path argument is a string that gets
put in the text entry for the file name. By default this is bound to
ControlL
with a path string of "" (the empty
string). It is also bound to / with a
path string of "/"
(a slash): this lets you type / and
immediately type a path name. On Unix systems, this is bound to
~ (tilde) with a path string
of "~" itself for access to home directories.



chooser :


the object which received the signal.




path :


default contents for the text entry for the file name




user_data :


user data set when the signal handler was connected.





You can create your own bindings for the
GtkFileChooserDefault::location-popup signal with custom
path strings, and have a crude form
of easily-to-type bookmarks. For example, say you access
the path /home/username/misc very
frequently. You could then create an
Alt M
shortcut by including the following in your
.gtkrc-3.0:

binding "misc-shortcut" {
bind "<Alt>M" {
"location-popup" ("/home/username/misc")
}
}
class "GtkFileChooserDefault" binding "misc-shortcut"




The "GtkFileChooserDefault::up-folder" signal

void user_function (GtkFileChooserDefault *chooser,
gpointer user_data);


This is used to make the file chooser go to the parent of
the current folder in the file hierarchy. By default this
is bound to Backspace and
AltUp
(the Up key in the numeric keypad also works).



chooser :


the object which received the signal.




user_data :


user data set when the signal handler was connected.






The "GtkFileChooserDefault::down-folder" signal

void user_function (GtkFileChooserDefault *chooser,
gpointer user_data);


This is used to make the file chooser go to a child of the
current folder in the file hierarchy. The subfolder that
will be used is displayed in the path bar widget of the file
chooser. For example, if the path bar is showing
"/foo/bar/baz", then this will cause
the file chooser to switch to the "baz" subfolder. By
default this is bound to
AltDown
(the Down key in the numeric keypad also works).



chooser :


the object which received the signal.




user_data :


user data set when the signal handler was connected.






The "GtkFileChooserDefault::home-folder" signal

void user_function (GtkFileChooserDefault *chooser,
gpointer user_data);


This is used to make the file chooser show the user's home
folder in the file list. By default this is bound to
AltHome
(the Home key in the numeric keypad also works).



chooser :


the object which received the signal.




user_data :


user data set when the signal handler was connected.






The "GtkFileChooserDefault::desktop-folder" signal

void user_function (GtkFileChooserDefault *chooser,
gpointer user_data);


This is used to make the file chooser show the user's Desktop
folder in the file list. By default this is bound to
AltD.



chooser :


the object which received the signal.




user_data :


user data set when the signal handler was connected.






The "GtkFileChooserDefault::quick-bookmark" signal

void user_function (GtkFileChooserDefault *chooser,
gint bookmark_index,
gpointer user_data);


This is used to make the file chooser switch to the bookmark
specified in the bookmark_index parameter.
For example, if you have three bookmarks, you can pass 0, 1, 2 to
this signal to switch to each of them, respectively. By default this is bound to
Alt1,
Alt2,
etc. until
Alt0. Note
that in the default binding,
that Alt1 is
actually defined to switch to the bookmark at index 0, and so on
successively;
Alt0 is
defined to switch to the bookmark at index 10.



chooser :


the object which received the signal.




bookmark_indes :


index of the bookmark to switch to; the indices start at 0.




user_data :


user data set when the signal handler was connected.
Properties
Properties Defined By
Methods / Constructors
Method / Constructor Defined By
Events - usage syntax: this.signals.EVENTNAME.connect( Function )
Event Defined By
Used by These Methods / Signals / Properties
Class / Namespace Method / Signal / Properties
Gtk.FileChooserButton
Property
dialog : Gtk.FileChooser
Instance of the GtkFileChooserDialog associated with the button.
Documentation generated by Introspection Doc Generator Loosely Based on JsDoc Toolkit on Sat Apr 16 2011 17:14:42 GMT+0800 (HKT)