Object Hierarchy:

Object hierarchy for Dialog


[ CCode ( type_id = "gtk_dialog_get_type ()" ) ]
public class Dialog : Window, Accessible, Buildable, ConstraintTarget, Native, Root, ShortcutManager

Dialog boxes are a convenient way to prompt the user for a small amount of input, e.

g. 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 Box, and is where widgets such as a Label or a 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.

Dialog boxes are created with a call to Dialog or Dialog.with_buttons. Dialog.with_buttons is recommended; it allows you to set the dialog title, some convenient flags, and add simple buttons.

A “modal” dialog (that is, one which freezes the rest of the application from user input), can be created by calling set_modal on the dialog. Use the GTK_WINDOW macro to cast the widget returned from Dialog into a Window. When using Dialog.with_buttons you can also pass the MODAL flag to make a dialog modal.

If you add buttons to Dialog using Dialog.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 ResponseType enumeration (these all have values less than zero). If a dialog receives a delete event, the response signal will be emitted with a response ID of DELETE_EVENT.

For the simple dialog in the following example, in reality you’d probably use 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.

An example for simple GtkDialog usage:

// Function to open a dialog box with a message
quick_message (GtkWindow *parent, char *message)
GtkWidget *dialog, *label, *content_area;
GtkDialogFlags flags;

// Create the widgets
dialog = gtk_dialog_new_with_buttons ("Message",
content_area = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
label = gtk_label_new (message);

// Ensure that the dialog box is destroyed when the user responds

g_signal_connect_swapped (dialog,
G_CALLBACK (gtk_window_destroy),

// Add the label, and show everything we’ve added

gtk_box_append (GTK_BOX (content_area), label);
gtk_widget_show (dialog);
# GtkDialog as GtkBuildable

The GtkDialog implementation of the Buildable interface exposes the content_area and action_area as internal children with the names “content_area” and “action_area”.

GtkDialog supports a custom <action-widgets> element, which can contain multiple <action-widget> elements. The “response” attribute specifies a numeric response, and the content of the element is the id of widget (which should be a child of the dialogs action_area). To mark a response as default, set the “default“ attribute of the <action-widget> element to true.

GtkDialog supports adding action widgets by specifying “action“ as the “type“ attribute of a <child> element. The widget will be added either to the action area or the headerbar of the dialog, depending on the “use-header-bar“ property. The response id has to be associated with the action widget using the <action-widgets> element.

An example of a Dialog UI definition fragment:

<object class="GtkDialog" id="dialog1">
<child type="action">
<object class="GtkButton" id="button_cancel"/>
<child type="action">
<object class="GtkButton" id="button_ok">
<action-widget response="cancel">button_cancel</action-widget>
<action-widget response="ok" default="true">button_ok</action-widget>


GtkDialog uses the DIALOG role.

Namespace: Gtk
Package: gtk4



Creation methods:



Inherited Members:

All known members inherited from class Gtk.Widget
All known members inherited from interface Gtk.Native
All known members inherited from interface Gtk.Root
All known members inherited from interface Gtk.ShortcutManager