NAME¶
Gtk2::Dialog - wrapper for GtkDialog
SYNOPSIS¶
# create a new dialog with some buttons - one stock, one not.
$dialog = Gtk2::Dialog->new ($title, $parent_window, $flags,
'gtk-cancel' => 'cancel',
'Do it' => 'ok');
# create window contents for yourself.
$dialog->get_content_area ()->add ($some_widget);
$dialog->set_default_response ('ok');
# show and interact modally -- blocks until the user
# activates a response.
$response = $dialog->run;
if ($response eq 'ok') {
do_the_stuff ();
}
# activating a response does not destroy the window,
# that's up to you.
$dialog->destroy;
DESCRIPTION¶
Dialog boxes are a convenient way to prompt the user for a small amount of
input, eg. to display a message, ask a question, or anything else that does
not require extensive effort on the user's part.
GTK+ treats a dialog as a window split vertically. The top section is a
Gtk2::VBox, and is where widgets such as a Gtk2::Label or a Gtk2::Entry should
be packed. The bottom area is known as the "action_area". This is
generally used for packing buttons into the dialog which may perform functions
such as cancel, ok, or apply. The two areas are separated by a
Gtk2::HSeparator.
GtkDialog boxes are created with a call to "Gtk2::Dialog->new". The
multi-argument form (and its alias, "new_with_buttons" is
recommended; it allows you to set the dialog title, some convenient flags, and
add simple buttons all in one go.
If
$dialog is a newly created dialog, the two primary areas
of the window can be accessed as "$dialog->get_content_area ()"
and "$dialog->get_action_area ()", as can be seen from the
example, below.
A 'modal' dialog (that is, one which freezes the rest of the application from
user input), can be created by calling the Gtk2::Window method
"set_modal" on the dialog. You can also pass the 'modal' flag to
"new".
If you add buttons to GtkDialog using "new",
"new_with_buttons", "add_button", "add_buttons",
or "add_action_widget", clicking the button will emit a signal
called "response" with a response ID that you specified. GTK+ will
never assign a meaning to positive response IDs; these are entirely
user-defined. But for convenience, you can use the response IDs in the
Gtk2::ResponseType enumeration. If a dialog receives a delete event, the
"response" signal will be emitted with a response ID of
'delete-event'.
If you want to block waiting for a dialog to return before returning control
flow to your code, you can call "$dialog->run". This function
enters a recursive main loop and waits for the user to respond to the dialog,
returning the response ID corresponding to the button the user clicked.
For the simple dialog in the following example, in reality you'd probably use
Gtk2::MessageDialog to save yourself some effort. But you'd need to create the
dialog contents manually if you had more than a simple message in the dialog.
# Function to open a dialog box displaying the message provided.
sub quick_message {
my $message = shift;
my $dialog = Gtk2::Dialog->new ('Message', $main_app_window,
'destroy-with-parent',
'gtk-ok' => 'none');
my $label = Gtk2::Label->new (message);
$dialog->get_content_area ()->add ($label);
# Ensure that the dialog box is destroyed when the user responds.
$dialog->signal_connect (response => sub { $_[0]->destroy });
$dialog->show_all;
}
Delete, Close and Destroy¶
In the default keybindings the "Esc" key calls the "close"
action signal. The default in that signal is to synthesise a
"delete-event" like a window manager close would do.
A delete-event first runs the "response" signal with ID
"delete-event", but the handler there can't influence the default
destroy behaviour of the "delete-event" signal. See Gtk2::Window for
notes on destroy vs hide.
If you add your own "Close" button to the dialog, perhaps using the
builtin "close" response ID, you must make your "response"
signal handler do whatever's needed for closing. Often a good thing is just to
run the "close" action signal the same as the Esc key.
sub my_response_handler {
my ($dialog, $response) = @_;
if ($response eq 'close') {
$self->signal_emit ('close');
} elsif ...
}
HIERARCHY¶
Glib::Object
+----Glib::InitiallyUnowned
+----Gtk2::Object
+----Gtk2::Widget
+----Gtk2::Container
+----Gtk2::Bin
+----Gtk2::Window
+----Gtk2::Dialog
INTERFACES¶
Glib::Object::_Unregistered::AtkImplementorIface
Gtk2::Buildable
METHODS¶
- •
- ... (list) of button-text => response-id pairs.
- •
- $flags (Gtk2::DialogFlags) interesting properties
- •
- $parent (Gtk2::Window or undef) make the new dialog
transient for this window
- •
- $title (string) window title
The multi-argument form takes the same list of text => response-id pairs as
"$dialog->add_buttons". Do not pack widgets directly into the
window; add them to "$dialog->get_content_area ()".
Here's a simple example:
$dialog = Gtk2::Dialog->new ('A cool dialog',
$main_app_window,
[qw/modal destroy-with-parent/],
'gtk-ok' => 'accept',
'gtk-cancel' => 'reject');
- •
- ... (list) of button-text => response-id pairs.
Alias for the multi-argument version of "Gtk2::Dialog->new".
- •
- $child (Gtk2::Widget)
- •
- $response_id (Gtk2::ResponseType)
widget = $dialog->add_button ($button_text,
$response_id)¶
- •
- $button_text (string) may be arbitrary text with mnenonics,
or stock ids
- •
- $response_id (Gtk2::ResponseType)
Returns the created button.
- •
- ... (list) of button-text => response-id pairs
Like calling "$dialog->add_button" repeatedly, except you don't get
the created widgets back. The buttons go from left to right, so the first
button added will be the left-most one.
- •
- ... (list)
Since: gtk+ 2.6
widget = $dialog->get_content_area¶
$dialog->set_default_response ($response_id)¶
- •
- $response_id (Gtk2::ResponseType)
boolean = $dialog->get_has_separator¶
$dialog->set_has_separator ($setting)¶
- •
- $setting (boolean)
$dialog->response ($response_id)¶
- •
- $response_id (Gtk2::ResponseType)
Emit the response signal, as though the user had clicked on the button with
$response_id.
- •
- $widget (Gtk2::Widget)
Since: gtk+ 2.8
$dialog->set_response_sensitive ($response_id,
$setting)¶
- •
- $response_id (Gtk2::ResponseType)
- •
- $setting (boolean)
Enable or disable an action button by its
$response_id.
$responsetype = $dialog->run¶
Blocks in a recursive main loop until the dialog either emits the response
signal, or is destroyed. If the dialog is destroyed during the call to
"$dialog->run", the function returns 'GTK_RESPONSE_NONE'
('none'). Otherwise, it returns the response ID from the "response"
signal emission. Before entering the recursive main loop,
"$dialog->run" calls "$widget->show" on
$dialog for you. Note that you still need to show any
children of the dialog yourself.
During "run", the default behavior of "delete_event" is
disabled; if the dialog receives "delete_event", it will not be
destroyed as windows usually are, and "run" will return
'delete-event'. Also, during "run" the dialog will be modal. You can
force "run" to return at any time by calling
"$dialog->response" to emit the "response" signal.
Destroying the dialog during "run" is a very bad idea, because your
post-run code won't know whether the dialog was destroyed or not.
After "run" returns, you are responsible for hiding or destroying the
dialog if you wish to do so.
Typical usage of this function might be:
if ('accept' eq $dialog->run) {
do_application_specific_something ();
} else {
do_nothing_since_dialog_was_cancelled ();
}
$dialog->destroy;
- •
- $response_id (Gtk2::ResponseType)
Since: gtk+ 2.20
PROPERTIES¶
- 'has-separator' (boolean : default false : readable /
writable / private)
- The dialog has a separator bar above its buttons
STYLE PROPERTIES¶
- 'action-area-border' (integer : default 5 : readable /
private)
- Width of border around the button area at the bottom of the
dialog
- 'button-spacing' (integer : default 6 : readable /
private)
- Spacing between buttons
- 'content-area-border' (integer : default 2 : readable /
private)
- Width of border around the main dialog area
- 'content-area-spacing' (integer : default 0 : readable /
private)
- Spacing between elements of the main dialog area
SIGNALS¶
- response (Gtk2::Dialog, integer)
- close (Gtk2::Dialog)
Note that currently in a Perl subclass of "Gtk2::Dialog" a class
closure, ie. class default signal handler, for the "response" signal
will be called with the response ID just as an integer, it's not turned into
an enum string like "ok" the way a handler setup with
"signal_connect" receives.
Hopefully this will change in the future, so don't count on it. In the interim
the easiest thing to do is install your default handler in
"INIT_INSTANCE" with a "signal_connect". (The subtleties
of what order handlers are called in will differ, but often that doesn't
matter.)
ENUMS AND FLAGS¶
flags Gtk2::DialogFlags¶
- •
- 'modal' / 'GTK_DIALOG_MODAL'
- •
- 'destroy-with-parent' /
'GTK_DIALOG_DESTROY_WITH_PARENT'
- •
- 'no-separator' / 'GTK_DIALOG_NO_SEPARATOR'
enum Gtk2::ResponseType¶
The response type is somewhat abnormal as far as gtk2-perl enums go. In C, this
enum lists named, predefined integer values for a field that is other composed
of whatever integer values you like. In Perl, we allow this to be either one
of the string constants listed here or any positive integer value. For
example, 'ok', 'cancel', 4, and 42 are all valid response ids. You cannot use
arbitrary string values, they must be integers. Be careful, because unknown
string values tend to be mapped to 0.
- •
- 'none' / 'GTK_RESPONSE_NONE'
- •
- 'reject' / 'GTK_RESPONSE_REJECT'
- •
- 'accept' / 'GTK_RESPONSE_ACCEPT'
- •
- 'delete-event' / 'GTK_RESPONSE_DELETE_EVENT'
- •
- 'ok' / 'GTK_RESPONSE_OK'
- •
- 'cancel' / 'GTK_RESPONSE_CANCEL'
- •
- 'close' / 'GTK_RESPONSE_CLOSE'
- •
- 'yes' / 'GTK_RESPONSE_YES'
- •
- 'no' / 'GTK_RESPONSE_NO'
- •
- 'apply' / 'GTK_RESPONSE_APPLY'
- •
- 'help' / 'GTK_RESPONSE_HELP'
SEE ALSO¶
Gtk2, Glib::Object, Glib::InitiallyUnowned, Gtk2::Object, Gtk2::Widget,
Gtk2::Container, Gtk2::Bin, Gtk2::Window
COPYRIGHT¶
Copyright (C) 2003-2011 by the gtk2-perl team.
This software is licensed under the LGPL. See Gtk2 for a full notice.