public class InfoBar : Widget, Accessible, Buildable, ConstraintTarget
`GtkInfoBar` can be show messages to the user without a dialog.
![An example GtkInfoBar](info-bar.png)
It is often temporarily shown at the top or bottom of a document. In contrast to [class@Gtk.Dialog], which has an action area at the bottom, `GtkInfoBar` has an action area at the side.
The API of `GtkInfoBar` is very similar to `GtkDialog`, allowing you to add buttons to the action area with [method@Gtk.InfoBar.add_button] or [ctor@Gtk.InfoBar.new_with_buttons]. The sensitivity of action widgets can be controlled with [method@Gtk.InfoBar.set_response_sensitive].
To add widgets to the main content area of a `GtkInfoBar`, use [method@Gtk.InfoBar.add_child].
Similar to [class@Gtk.MessageDialog], the contents of a `GtkInfoBar` can by classified as error message, warning, informational message, etc, by using [method@Gtk.InfoBar.set_message_type]. GTK may use the message type to determine how the message is displayed.
A simple example for using a `GtkInfoBar`: ```c GtkWidget *message_label; GtkWidget *widget; GtkWidget *grid; GtkInfoBar *bar;
// set up info bar widget = gtk_info_bar_new (); bar = GTK_INFO_BAR (widget); grid = gtk_grid_new ();
message_label = gtk_label_new (""); gtk_info_bar_add_child (bar, message_label); gtk_info_bar_add_button (bar, _("_OK"), GTK_RESPONSE_OK); g_signal_connect (bar, "response", G_CALLBACK (gtk_widget_hide), NULL); gtk_grid_attach (GTK_GRID (grid), widget, 0, 2, 1, 1);
// show an error message gtk_label_set_text (GTK_LABEL (message_label), "An error occurred!"); gtk_info_bar_set_message_type (bar, GTK_MESSAGE_ERROR); gtk_widget_show (bar); ```
GtkInfoBar as GtkBuildable
The `GtkInfoBar` implementation of the `GtkBuildable` interface exposes the content area and action area as internal children with the names “content_area” and “action_area”.
`GtkInfoBar` 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
`GtkInfoBar` has a single CSS node with name infobar. The node may get one of the style classes .info, .warning, .error or .question, depending on the message type. If the info bar shows a close button, that button will have the .close style class applied.