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 and optionally draws a beveled frame around 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. 
<footnote><para>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 lacked interface support in
the object system, this interface is hackily implemented as a signal
in #GtkWidgetClass. The GTK+ 2.0 object system would allow a clean
implementation, but it wasn't worth breaking the
API.)</para></footnote>
Widgets with native scroll support include #GtkTreeView, #GtkTextView, 
and #GtkLayout.
</para>

<para>
For widgets that lack native scrolling support, the #GtkViewport
widget acts as an adaptor class, implementing scrollability for child
widgets that lack their own scrolling capabilities. Use #GtkViewport
to scroll child widgets such as #GtkTable, #GtkBox, and so on.
</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>

<para>
The position of the scrollbars is controlled by the scroll
adjustments. See #GtkAdjustment for the fields in an adjustment - for
#GtkScrollbar, used by #GtkScrolledWindow, the "value" field
represents the position of the scrollbar, which must be between the
"lower" field and "upper - page_size." The "page_size" field
represents the size of the visible scrollable area. The
"step_increment" and "page_increment" fields are used when the user
asks to step down (using the small stepper arrows) or page down (using
for example the PageDown key).
</para>

<para>
If a #GtkScrolledWindow doesn't behave quite as you would like, or
doesn't have exactly the right layout, it's very possible to set up
your own scrolling with #GtkScrollbar and for example a #GtkTable.
</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_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_shadow_type ##### -->
<para>

</para>

@scrolled_window: 
@type: 


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

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


<!-- ##### FUNCTION gtk_scrolled_window_get_placement ##### -->
<para>

</para>

@scrolled_window: 
@Returns: 


<!-- ##### FUNCTION gtk_scrolled_window_get_policy ##### -->
<para>

</para>

@scrolled_window: 
@hscrollbar_policy: 
@vscrollbar_policy: 
<!-- # Unused Parameters # -->
@vscrollvar_policy: 


<!-- ##### FUNCTION gtk_scrolled_window_get_shadow_type ##### -->
<para>

</para>

@scrolled_window: 
@Returns: 


<!-- ##### 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>

<!-- ##### ARG GtkScrolledWindow:shadow-type ##### -->
<para>
Type of frame drawn around the child of the scrolled window.
</para>