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# Package Gtk.Status`_`Bar

A status bar is a special widget in which you can display messages. This type of widget is generally found at the bottom of application windows, and is used to display help or error messages.

This widget works as a stack of messages, ie all older messages are kept when a new one is inserted. It is of course possible to remove the most recent message from the stack. This stack behavior is especially useful when messages can be displayed from several places in your application. Thus, each one subprogram that needs to print a message can simply push it on the stack, and does not need to make sure that the user has had enough time to read the previous message (a timeout can be set to automatically remove the message after a specific delay)

Each message is associated with a specific Context_Id. Each of this context can have a special name, and these context can be used to organize the messages into categories (for instance one for help messages and one for error messages). You can then selectively remove the most recent message of each category.

- Gtk.Status_Bar Widget Hierarchy
- Gtk.Status_Bar Signals
- Gtk.Status_Bar Types
- Gtk.Status_Bar Subprograms

## Widget Hierarchy

    Gtk_Object                    (see section Package Gtk.Object)
       \___ Gtk_Widget            (see section Package Gtk.Widget)
          \___ Gtk_Container      (see section Package Gtk.Container)
             \___ Gtk_Box         (see section Package Gtk.Box)
                \___ Gtk_Status_Bar (see section Package Gtk.Status_Bar)

## Signals

- "text_popped" procedure Handler (Status_Bar : access Gtk_Status_Bar_Record'Class;
  Context : Context_Id;
  Text : Interfaces.C.Strings.chars_ptr);
  Emitted when a message has been removed from the queue.
- "text_pushed" procedure Handler (Status_Bar : access Gtk_Status_Bar_Record'Class;
  Context : Context_Id;
  Text : Interfaces.C.Strings.chars_ptr);
  Emitted when a new message has been in the queue.

## Types

    type Context_Id is new Guint;
    subtype Gtk_Statusbar is Gtk_Status_Bar;
| This is needed by Gate since the C name is GtkStatusbar
    type Message_Id is new Guint;
    type Status_Bar_Msg is record
        Text    : Interfaces.C.Strings.chars_ptr;
        Context : Context_Id;
        Message : Message_Id;
        end record;
| A message from the queue. Each of this message is associated with a specific context, and has a specific number.

## Subprograms

    function Convert
      (Msg                :        Status_Bar_Msg)
       return System.Address;
    procedure Gtk_New
      (Statusbar          : out    Gtk_Status_Bar);
| Create a new status bar, in which messages will be displayed.
    function Get_Type              return Gtk.Gtk_Type;
| Return the internal value associated with a Gtk_Status_Bar.
    function Get_Context_Id
      (Statusbar          : access Gtk_Status_Bar_Record;
       Context_Description  : in     String)
       return Context_Id;
| Create the context id associated with a special name. If no context is currently associated with Context_Description, then a new context is created.
    function Get_Messages
      (Statusbar          : access Gtk_Status_Bar_Record)
       return Messages_List.GSlist;
| Return a list of all the messages currently stored in the queue. The first item in the list is the most recent message.
    function Push
      (Statusbar          : access Gtk_Status_Bar_Record;
       Context            : in     Context_Id;
       Text               : in     String)
       return Message_Id;
| Push a new message on the queue, associated with a specific context. This message is directly displayed in the status bar. A new unique message id is associated with this message.
    procedure Pop
      (Statusbar          : access Gtk_Status_Bar_Record;
       Context            : in     Context_Id);
| Remove the most recent message from a specific context. All other contexts are ignored, and no error is raised if there is no message in Context.
    procedure Remove
      (Statusbar          : access Gtk_Status_Bar_Record;
       Context            : in     Context_Id;
       Message            : in     Message_Id);
| Remove a message from the list. The message is only removed if it is in a specific context. Nothing happens if no matching message is found.

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