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

<!-- ##### SECTION Title ##### -->
GtkScrolledWindow

<!-- ##### SECTION Short_Description ##### -->

Adds scrollbars to its child widget.

<!-- ##### SECTION Long_Description ##### -->
<para>
#GtkScrolledWindow is a #GtkBin subclass: it's a container 
the accepts a single child widget. #GtkScrolledWindow adds scrollbars
to the child widget.
</para>

<para>
The scrolled window can work in two ways. Some widgets have native
scrolling support; these widgets have "slots" for #GtkAdjustment
objects. The scrolled window installs #GtkAdjustment objects in the
child window's slots using the set_scroll_adjustments_signal, found in
#GtkWidgetClass. (Conceptually, these widgets implement a "Scrollable"
interface; because GTK+ 1.2 lacks multiple inheritance, this interface
is hackily implemented as a signal in #GtkWidgetClass.)
</para>

<para>
The second way to use the scrolled window is useful with widgets that
lack the set_scroll_adjustments_signal. The #GtkViewport widget acts as
a proxy, implementing scrollability for child widgets that lack their
own scrolling capabilities. 
</para>

<para>
If a widget has native scrolling abilities, it can be added to the
#GtkScrolledWindow with gtk_container_add(). If a widget does not, you
must first add the widget to a #GtkViewport, then add the GtkViewport
to the scrolled window. The convenience function
gtk_scrolled_window_add_with_viewport() does exactly this, so you can
ignore the presence of the viewport.
</para>

<!-- ##### SECTION See_Also ##### -->
<para>
#GtkViewport, #GtkAdjustment, #GtkWidgetClass
</para>

<!-- ##### STRUCT GtkScrolledWindow ##### -->
<para>
There are no public fields in the #GtkScrolledWindow struct; it should 
only be accessed using the functions below.
</para>


<!-- ##### FUNCTION gtk_scrolled_window_new ##### -->
<para>
Creates a new scrolled window. The two arguments are the scrolled
window's 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 pass NULL for the adjustments, which will cause the scrolled window
to create them for you.
</para>

@hadjustment: Horizontal adjustment.
@vadjustment: Vertical adjustment.
@Returns: New scrolled window.


<!-- ##### FUNCTION gtk_scrolled_window_get_hadjustment ##### -->
<para>
Returns the horizontal scrollbar's adjustment, used to connect the
horizontal scrollbar to the child widget's horizontal scroll
functionality.
</para>

@scrolled_window: A #GtkScrolledWindow.
@Returns: The horizontal #GtkAdjustment.


<!-- ##### FUNCTION gtk_scrolled_window_get_vadjustment ##### -->
<para>
Returns the vertical scrollbar's adjustment, used to connect the
vertical scrollbar to the child widget's vertical scroll
functionality.
</para>

@scrolled_window: A #GtkScrolledWindow.
@Returns: The vertical #GtkAdjustment.


<!-- ##### FUNCTION gtk_scrolled_window_set_policy ##### -->
<para>
Sets the scrollbar policy for the horizontal and vertical scrollbars. 
The policy determines when the scrollbar should appear; it is a value
from the #GtkPolicyType enumeration. If %GTK_POLICY_ALWAYS, the
scrollbar is always present; if %GTK_POLICY_NEVER, the scrollbar is
never present; if %GTK_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).
</para>

@scrolled_window: A #GtkScrolledWindow.
@hscrollbar_policy: Policy for horizontal bar.
@vscrollbar_policy: Policy for vertical bar.


<!-- ##### FUNCTION gtk_scrolled_window_add_with_viewport ##### -->
<para>
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.
</para>

<para>
The viewport scrolls the child by moving its #GdkWindow, and takes the
size of the child to be the size of its toplevel #GdkWindow. This will
be very wrong for most widgets that support native scrolling; for
example, if you add a #GtkCList with a viewport, the whole widget will
scroll, including the column headings. Thus #GtkCList supports
scrolling already, and should not be used with the #GtkViewport proxy.
</para>

<para>
A widget supports scrolling natively if the
set_scroll_adjustments_signal field in #GtkWidgetClass is non-zero,
i.e. has been filled in with a valid signal identifier.
</para>

@scrolled_window: A #GtkScrolledWindow.
@child: Widget you want to scroll.


<!-- ##### FUNCTION gtk_scrolled_window_set_hadjustment ##### -->
<para>
Sets the #GtkAdjustment for the horizontal scrollbar.
</para>

@scrolled_window: A #GtkScrolledWindow.
@hadjustment: Horizontal scroll adjustment.


<!-- ##### FUNCTION gtk_scrolled_window_set_placement ##### -->
<para>
Determines the location of the child widget with respect to the
scrollbars. The default is %GTK_CORNER_TOP_LEFT, meaning the child is
in the top left, with the scrollbars underneath and to the right.
Other values in #GtkCornerType are %GTK_CORNER_TOP_RIGHT,
%GTK_CORNER_BOTTOM_LEFT, and %GTK_CORNER_BOTTOM_RIGHT.
</para>

@scrolled_window: A #GtkScrolledWindow.
@window_placement: Position of the child window.


<!-- ##### FUNCTION gtk_scrolled_window_set_vadjustment ##### -->
<para>
Sets the #GtkAdjustment for the vertical scrollbar.
</para>

@scrolled_window: A #GtkScrolledWindow.
@hadjustment: 
<!-- # Unused Parameters # -->
@vadjustment: Vertical scroll adjustment.


<!-- ##### ARG GtkScrolledWindow:hadjustment ##### -->
<para>
Horizontal adjustment. See gtk_scrolled_window_set_hadjustment(), gtk_scrolled_window_get_hadjustment().
</para>

<!-- ##### ARG GtkScrolledWindow:vadjustment ##### -->
<para>
Vertical adjustment. See gtk_scrolled_window_set_vadjustment(), gtk_scrolled_window_get_vadjustment().
</para>

<!-- ##### ARG GtkScrolledWindow:hscrollbar_policy ##### -->
<para>
Horizontal scrollbar policy (show scrollbar always, never, or "when appropriate").
</para>

<!-- ##### ARG GtkScrolledWindow:vscrollbar_policy ##### -->
<para>
Vertical scrollbar policy (show scrollbar always, never, or "when appropriate").
</para>

<!-- ##### ARG GtkScrolledWindow:window_placement ##### -->
<para>
Position of child window with respect to scrollbars; top left, top
right, bottom left, bottom right.
</para>