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# Package Gtk.Packer

A Gtk_Packer is a container that organizes its children according to a given location (North, East, South, West or any combination of them).

The children can be set to expand and/or fill their assigned location.

- Gtk.Packer Widget Hierarchy
- Gtk.Packer Types
- Gtk.Packer 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_Packer      (see section Package Gtk.Packer)

## Types

    type Gtk_Anchor_Type is
        (Anchor_Center,
         Anchor_North,
         Anchor_North_West,
         Anchor_North_East,
         Anchor_South,
         Anchor_South_East,
         Anchor_South_West,
         Anchor_West,
         Anchor_East);
| Gtk_Anchor_Type indicates the exact location of the widget on its side. Note that not all anchors are relevant for each side. For instance, if you put a widget on Side_Right, with an anchor of Anchor_North, Anchor_North_West or Anchor_North_East, the widget will in fact appear on the upper right side of the remaining space in the container. Thus, if a previous child was added on Side_North, then the new child will only appear on the second line in the container. The order the children are inserted into the container is important.
    type Gtk_Packer_Child is new Gdk.C_Proxy;
| A child of the packer. It includes both the widget and its position in the packer.
    type Gtk_Packer_Options is new Guint;
| Indicate how the child should fill its allocated area. If Gtk_Pack_Expand is set, the child allocated area is expanded to occupy the whole width (or height) or the Package. The orientation depends on the side of the child (if Top or Bottom, the expansion is done vertically, otherwise it is done horizontally). If Gtk_Fill_X or Gtk_Fill_Y is set, the child is resized till it occupies all the area allocated to it. If the side of the widget is top or bottom, the widget can always be filled horizontally with Gtk_Fill_X (and will thus be as wide as the Gtk_Packer itself. However, it can be filled vertically with Gtk_Fill_Y only if Gtk_Pack_Expand is set.
    type Gtk_Side_Type is
        (Side_Top,
         Side_Bottom,
         Side_Left,
         Side_Right);
| Gtk_Side_Type indicates on which the widget should be inserted. The children are displayed in the order they were inserted into the container. Each time a child is displayed, the available space for the remaining child is restrained. For instance, every time you put a child on the Side_Top or Side_Bottom, the available space is decreased so that no other widget is inserted in the same line. For instance, if you put two widgets on Side_Top, the second one will appear below the first one. If you add two widgets on Side_Right, the second one will be placed on the left of the first.

## Subprograms

### Modifying the Packer
    procedure Gtk_New
      (Widget             : out    Gtk_Packer);
| Create a new empty packer.
    function Get_Type              return Gtk.Gtk_Type;
| Return the internal value associated with a Gtk_Packer.
    procedure Add_Defaults
      (Packer             : access Gtk_Packer_Record;
       Child              : access Gtk.Widget.Gtk_Widget_Record'Class;
       Side               : in     Gtk_Side_Type;
       Anchor             : in     Gtk_Anchor_Type;
       Options            : in     Gtk_Packer_Options);
| Add a new child in the container, with default values for its border width and its padding. See Gtk_Size_Type, Gtk_Anchor_Type and Gtk_Packer_Options above for more information on these types.
    procedure Add
      (Packer             : access Gtk_Packer_Record;
       Child              : access Gtk.Widget.Gtk_Widget_Record'Class;
       Side               : in     Gtk_Side_Type;
       Anchor             : in     Gtk_Anchor_Type;
       Options            : in     Gtk_Packer_Options;
       Border_Width       : in     Guint;
       Pad_X              : in     Guint;
       Pad_Y              : in     Guint;
       I_Pad_X            : in     Guint;
       I_Pad_Y            : in     Guint);
| Add a new child in the container. See Gtk_Size_Type, Gtk_Anchor_Type and Gtk_Packer_Options above for more information on these types. Border_Width is the space left on each side of the child. Pad_X is additional space left on each horizontal side of the child when it is not centered (the anchor is NE, E, NW, SW, W, SE) Pad_Y is additional space left on each vertical side of the child when it is not centered (the anchor is NW, N, NE, SE, S, SW) I_Pad_X is additional space left on each horizontal side of the child when it is on the borders (anchor is N, Center, S) I_Pad_Y is additional space left on each vertical side of the child when it is on the borders (anchor is E, Center, W)
    procedure Set_Child_Packing
      (Packer             : access Gtk_Packer_Record;
       Child              : access Gtk.Widget.Gtk_Widget_Record'Class;
       Side               : in     Gtk_Side_Type;
       Anchor             : in     Gtk_Anchor_Type;
       Options            : in     Gtk_Packer_Options;
       Border_Width       : in     Guint;
       Pad_X              : in     Guint;
       Pad_Y              : in     Guint;
       I_Pad_X            : in     Guint;
       I_Pad_Y            : in     Guint);
| Change the packing options for Child. See the documentation for Add above for more information on the parameters. Nothing is done if Child is not contained in Packer.
    procedure Reorder_Child
      (Packer             : access Gtk_Packer_Record;
       Child              : access Gtk.Widget.Gtk_Widget_Record'Class;
       Position           : in     Gint);
| Change the position of the child in the list of children. As seen in the explanation of the packing parameters, the order of the children is important, since each child inserted limits the space available to the next children in the list.
    procedure Set_Default_Border_Width
      (Packer             : access Gtk_Packer_Record;
       Border             : in     Guint);
| Modify the default border width for all the children of Packer. This is the border_width that is used by Add_Defaults above. Its default value is 0.
    procedure Set_Default_Ipad
      (Packer             : access Gtk_Packer_Record;
       I_Pad_X            : in     Guint;
       I_Pad_Y            : in     Guint);
| Set the default Ipadding for all the children of Packer. This is the value used by Add_Defaults above. The default values are 0.
    procedure Set_Default_Pad
      (Packer             : access Gtk_Packer_Record;
       Pad_X              : in     Guint;
       Pad_Y              : in     Guint);
| Set the default Padding for all the children of Packer. This is the value used by Add_Defaults above. The default values are 0.
### Accessing children
Some functions give access to the children of a Gtk_Packer. You can not use the standard Gtk.Container.Children function as is, since the children are not exactly widgets but more complicated structures. In C, one would use a direct access to the fields of the packer, and then do some type-casting, which is what we are trying to avoid in Ada.
    function Find_Child
      (Packer             : access Gtk_Packer_Record;
       Child              : access Gtk.Widget.Gtk_Widget_Record'Class)
       return Gtk_Packer_Child;
| Return the child of Packer that is associated with the widget Child. Null_Packer_Child will be returned if Child is not contained in Packer.
    function Get_Nth_Child
      (Packer             : access Gtk_Packer_Record;
       N                  :        Guint)
       return Gtk_Packer_Child;
| Returns the Nth child of the packer. The first child is found at index 1. Null_Packer_Child will be returned if there is no such child in Packer.
    function Get_Anchor
      (Child              :        Gtk_Packer_Child)
       return Gtk_Anchor_Type;
| Return the Anchor type for the child.
    function Get_Side
      (Child              :        Gtk_Packer_Child)
       return Gtk_Side_Type;
| Return the side of the child.
    function Get_Options
      (Chlid              :        Gtk_Packer_Child)
       return Gtk_Packer_Options;
| Return the options set for the child.
    function Get_Border_Width
      (Child              :        Gtk_Packer_Child)
       return Guint;
| Return the border width for the child.
    function Get_Pad_X
      (Child              :        Gtk_Packer_Child)
       return Guint;
| Return the X padding for the child (when on the borders).
    function Get_Pad_Y
      (Child              :        Gtk_Packer_Child)
       return Guint;
| Return the Y padding for the child (when on the borders).
    function Get_I_Pad_X
      (Child              :        Gtk_Packer_Child)
       return Guint;
| Return the X i_padding for the child (when not on the borders).
    function Get_I_Pad_Y
      (Child              :        Gtk_Packer_Child)
       return Guint;
| Return the Y i_padding for the child (when not on the borders).

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