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WindowGtk_Scrolled_Window is a Gtk_Bin child: it's a container the accepts a single child widget. Gtk_Scrolled_Window adds scrollbars to the child widget.
The scrolled window can work in two ways. Some widgets have native scrolling support; these widgets have "slots" for Gtk_Adjustment objects. The scrolled window installs Gtk_Adjustment objects in the child window's slots using the "set_scroll_adjustments" signal (Conceptually, these widgets implement a "Scrollable" interface).
The second way to use the scrolled window is useful with widgets that lack the "set_scroll_adjustments" signal. The Gtk_Viewport widget acts as a proxy, implementing scrollability for child widgets that lack their own scrolling capabilities.
If a widget has native scrolling abilities, it can be added to the Gtk_Scrolled_Window with Gtk.Container.Add. If a widget does not, you must first add the widget to a Gtk_Viewport, then add the Gtk_Viewport to the scrolled window. The convenience function Add_With_Viewport does exactly this, so you can ignore the presence of the viewport.
If you want to create your own new widget type that can be inserted directly into a scrolled_window, you need to specify a signal for Set_Scroll_Adjustments in the call to Gtk.Object.Initialize_Class_Record.
Widget Hierarchy |
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GObject (see Package_Glib.Object) Gtk_Object (see Package_Gtk.Object) \___ Gtk_Widget (see Package_Gtk.Widget) \___ Gtk_Container (see Package_Gtk.Container) \___ Gtk_Bin (see Package_Gtk.Bin) \___ Gtk_Scrolled_Window (see Package_Gtk.Scrolled_Window) |
Subprograms |
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procedure Gtk_New (Scrolled_Window : out Gtk_Scrolled_Window; Hadjustment : Gtk_Adjustment := Null_Adjustment; Vadjustment : Gtk_Adjustment := Null_Adjustment); |
Create a new scrolled window. The two arguments are the scrolled window's horizontal and vertical adjustments; these will be shared with the scrollbars and the child widget to keep the bars in sync with the child. Usually you want to use the default value Null_Adjustment for the adjustments, which will cause the scrolled window to create them for you. |
function Get_Type return Gtk.Gtk_Type; |
Return the internal value associated with a Gtk_Scrolled_Window. |
procedure Set_Hadjustment (Scrolled_Window : access Gtk_Scrolled_Window_Record; Hadjustment : Gtk_Adjustment); |
Set the Gtk_Adjustment for the horizontal scrollbar. |
procedure Set_Vadjustment (Scrolled_Window : access Gtk_Scrolled_Window_Record; Vadjustment : Gtk_Adjustment); |
Set the Gtk_Adjustment for the vertical scrollbar. |
function Get_Hadjustment (Scrolled_Window : access Gtk_Scrolled_Window_Record) return Gtk_Adjustment; |
Return the horizontal scrollbar's adjustment. This adjustment is used to connect the horizontal scrollbar to the child widget's horizontal scroll functionality. |
function Get_Vadjustment (Scrolled_Window : access Gtk_Scrolled_Window_Record) return Gtk_Adjustment; |
Return the vertical scrollbar's adjustment. This adjustment is used to connect the vertical scrollbar to the child widget's vertical scroll functionality. |
procedure Set_Policy (Scrolled_Window : access Gtk_Scrolled_Window_Record; H_Scrollbar_Policy : Enums.Gtk_Policy_Type; V_Scrollbar_Policy : Enums.Gtk_Policy_Type); |
Set the scrollbar policy for the horizontal and vertical scrollbars. It determines when the scrollbar should appear; it is a value from the Gtk_Policy_Type enumeration. If Policy_Always, the scrollbar is always present; if Policy_Never, the scrollbar is never present; if Policy_Automatic, the scrollbar is present only if needed (that is, if the slider part of the bar would be smaller than the trough - the display is larger than the page size). |
procedure Get_Policy (Scrolled_Window : access Gtk_Scrolled_Window_Record; H_Scrollbar_Policy : out Enums.Gtk_Policy_Type; V_Scrollbar_Policy : out Enums.Gtk_Policy_Type); |
Return the scrollbar policy for the horizontal and vertical scrollbars. |
procedure Set_Placement (Scrolled_Window : access Gtk_Scrolled_Window_Record; Window_Placement : Gtk.Enums.Gtk_Corner_Type); |
Determine the location of the widget with respect to the scrollbars. The default is Corner_Top_Left. |
function Get_Placement (Scrolled_Window : access Gtk_Scrolled_Window_Record) return Gtk.Enums.Gtk_Corner_Type; |
Return the location of the widget with respect to the scrollbars. |
procedure Set_Shadow_Type (Scrolled_Window : access Gtk_Scrolled_Window_Record; Shadow_Type : Gtk.Enums.Gtk_Shadow_Type); |
Change the type of shadow drawn around the contents of Scrolled_Window. |
function Get_Shadow_Type (Scrolled_Window : access Gtk_Scrolled_Window_Record) return Gtk.Enums.Gtk_Shadow_Type; |
Return the type of shadow drawn around the contents of Scrolled_Window. |
procedure Add_With_Viewport (Scrolled_Window : access Gtk_Scrolled_Window_Record; Child : access Gtk.Widget.Gtk_Widget_Record'Class); |
Used to add children without native scrolling capabilities. This is simply a convenience function; it is equivalent to adding the unscrollable child to a viewport, then adding the viewport to the scrolled window. If a child has native scrolling, use Gtk.Container.Add instead of this function. The viewport scrolls the child by moving its Gdk_Window, and takes the size of the child to be the size of its toplevel Gdk_Window. This will be very wrong for most widgets that support native scrolling; for example, if you add a Gtk_Clist with a viewport, the whole widget will scroll, including the column headings. Thus Gtk_Clist supports scrolling already, and should not be used with the GtkViewport proxy. A widget supports scrolling natively if it contains a valid "set_scroll_adjustments" signal. |