gtk2/docs/reference/gtk/tmpl/gtkdialog.sgml

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GtkDialog

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create popup windows.

<!-- ##### SECTION Long_Description ##### -->

<para>
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.
</para>

<para>
Gtk+ treats a dialog as a window split horizontally. The top section is a
#GtkVBox, and is where widgets such as a #GtkLabel or a #GtkEntry should be
packed. The second area is known as the
<structfield>action_area</structfield>. 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 #GtkHSeparator.
</para>

<para>
#GtkDialog boxes are created with a call to gtk_dialog_new() or
gtk_dialog_new_with_buttons(). gtk_dialog_new_with_buttons() is recommended; it
allows you to set the dialog title, some convenient flags, and add simple
buttons.
</para>

<para>
If 'dialog' is a newly created dialog, the two primary areas of the window 
can be accessed as GTK_DIALOG(dialog)->vbox and GTK_DIALOG(dialog)->action_area,
as can be seen from the example, below.
</para>

<para>
A 'modal' dialog (that is, one which freezes the rest of the application from
user input), can be created by calling gtk_window_set_modal() on the dialog. Use
the GTK_WINDOW() macro to cast the widget returned from gtk_dialog_new() into a
#GtkWindow. When using gtk_dialog_new_with_buttons() you can also pass the
GTK_DIALOG_MODAL flag to make a dialog modal.
</para>

<para>
If you add buttons to #GtkDialog using gtk_dialog_new_with_buttons(),
gtk_dialog_add_button(), gtk_dialog_add_buttons(), or
gtk_dialog_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 #GtkResponseType 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 GTK_RESPONSE_NONE.
</para>


<para>
If you want to block waiting for a dialog to return before returning control
flow to your code, you can call gtk_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.
</para>

<para>
For the simple dialog in the following example, in reality you'd probably use
#GtkMessageDialog 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.
<example>
<title>Simple #GtkDialog usage.</title>
<programlisting>

/* Function to open a dialog box displaying the message provided. */

void quick_message(#gchar *message) {

   #GtkWidget *dialog, *label;
   
   /* Create the widgets */
   
   dialog = gtk_dialog_new_with_buttons ("Message",
                                         main_application_window,
                                         GTK_DIALOG_DESTROY_WITH_PARENT,
                                         GTK_STOCK_BUTTON_OK,
                                         GTK_RESPONSE_NONE,
                                         NULL);
   label = gtk_label_new (message);
   
   /* Ensure that the dialog box is destroyed when the user responds. */
   
   gtk_signal_connect_object (GTK_OBJECT (dialog), "response",
                              GTK_SIGNAL_FUNC (gtk_widget_destroy), 
                              GTK_OBJECT (dialog));

   /* Add the label, and show everything we've added to the dialog. */

   gtk_container_add (GTK_CONTAINER (GTK_DIALOG(dialog)->vbox),
                      label);
   gtk_widget_show_all (dialog);
}

</programlisting>
</example>
</para>

<!-- ##### SECTION See_Also ##### -->

<para>
<variablelist>
<varlistentry>
<term>#GtkVBox</term>
<listitem><para>Pack widgets vertically.</para></listitem>
</varlistentry>
<varlistentry>
<term>#GtkWindow</term>
<listitem><para>Alter the properties of your dialog box.</para></listitem>
</varlistentry>
<varlistentry>
<term>#GtkButton</term>
<listitem><para>Add them to the <structfield>action_area</structfield> to get a
response from the user.</para></listitem>
</varlistentry>
</variablelist>
</para>

<!-- ##### STRUCT GtkDialog ##### -->
<para>
<structfield>window</structfield> is a #GtkWindow, but should not be
modified directly, (use the functions provided, such as
gtk_window_set_title(). See the #GtkWindow section for more).
</para>
<para>
<structfield>vbox</structfield> is a #GtkVBox - the main part of the dialog box.
</para>
<para>
<structfield>action_area</structfield> is a #GtkHBox packed below the dividing #GtkHSeparator in the dialog. It is treated exactly the same as any other #GtkHBox.
</para>


<!-- ##### ENUM GtkDialogFlags ##### -->
<para>

</para>

@GTK_DIALOG_MODAL: 
@GTK_DIALOG_DESTROY_WITH_PARENT: 

<!-- ##### ENUM GtkResponseType ##### -->
<para>

</para>

@GTK_RESPONSE_NONE: 
@GTK_RESPONSE_REJECT: 
@GTK_RESPONSE_ACCEPT: 

<!-- ##### FUNCTION gtk_dialog_new ##### -->
<para>
Creates a new dialog box. Widgets should not be packed into this #GtkWindow
directly, but into the vbox and action_area, as described above. 
</para>

@Returns: a #GtkWidget - the newly created dialog box.


<!-- ##### FUNCTION gtk_dialog_new_with_buttons ##### -->
<para>

</para>

@title: 
@parent: 
@flags: 
@first_button_text: 
@Varargs: 
@Returns: 


<!-- ##### FUNCTION gtk_dialog_run ##### -->
<para>

</para>

@dialog: 
@Returns: 


<!-- ##### FUNCTION gtk_dialog_response ##### -->
<para>

</para>

@dialog: 
@response_id: 


<!-- ##### FUNCTION gtk_dialog_add_button ##### -->
<para>

</para>

@dialog: 
@button_text: 
@response_id: 


<!-- ##### FUNCTION gtk_dialog_add_buttons ##### -->
<para>

</para>

@dialog: 
@first_button_text: 
@Varargs: 


<!-- ##### FUNCTION gtk_dialog_add_action_widget ##### -->
<para>

</para>

@dialog: 
@child: 
@response_id: 
<!-- # Unused Parameters # -->
@widget: 


<!-- ##### SIGNAL GtkDialog::response ##### -->
<para>
Emitted when an action widget is clicked, the dialog receives a delete event, or
the application programmer calls gtk_dialog_response(). On a delete event, the
response ID is GTK_RESPONSE_NONE. Otherwise, it depends on which action widget
was clicked.
</para>

@dialog: the object which received the signal.
@arg1: the response ID