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Functions
Properties
| GtkAdjustment * | hadjustment | Read / Write / Construct |
| GtkPolicyType | hscrollbar-policy | Read / Write |
| GtkShadowType | shadow-type | Read / Write |
| GtkAdjustment * | vadjustment | Read / Write / Construct |
| GtkPolicyType | vscrollbar-policy | Read / Write |
| GtkCornerType | window-placement | Read / Write |
| gboolean | window-placement-set | Read / Write |
Object Hierarchy
GObject ╰── GInitiallyUnowned ╰── GtkObject ╰── GtkWidget ╰── GtkContainer ╰── GtkBin ╰── GtkScrolledWindow
Description
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.
The scrolled window can work in two ways. Some widgets have native scrolling support; these widgets have "slots" for GtkAdjustment objects. [5] Widgets with native scroll support include GtkTreeView, GtkTextView, and GtkLayout.
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.
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.
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).
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.
Functions
gtk_scrolled_window_new ()
GtkWidget * gtk_scrolled_window_new (GtkAdjustment *hadjustment,GtkAdjustment *vadjustment);
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.
gtk_scrolled_window_get_hadjustment ()
GtkAdjustment *
gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window);
Returns the horizontal scrollbar's adjustment, used to connect the horizontal scrollbar to the child widget's horizontal scroll functionality.
gtk_scrolled_window_get_vadjustment ()
GtkAdjustment *
gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window);
Returns the vertical scrollbar's adjustment, used to connect the vertical scrollbar to the child widget's vertical scroll functionality.
gtk_scrolled_window_get_hscrollbar ()
GtkWidget *
gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window);
Returns the horizontal scrollbar of scrolled_window
.
Returns
the horizontal scrollbar of the scrolled window,
or NULL if it does not have one.
[transfer none]
Since: 2.8
gtk_scrolled_window_get_vscrollbar ()
GtkWidget *
gtk_scrolled_window_get_vscrollbar (GtkScrolledWindow *scrolled_window);
Returns the vertical scrollbar of scrolled_window
.
Returns
the vertical scrollbar of the scrolled window,
or NULL if it does not have one.
[transfer none]
Since: 2.8
gtk_scrolled_window_set_policy ()
void gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,GtkPolicyType hscrollbar_policy,GtkPolicyType vscrollbar_policy);
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).
gtk_scrolled_window_add_with_viewport ()
void gtk_scrolled_window_add_with_viewport (GtkScrolledWindow *scrolled_window,GtkWidget *child);
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 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 widget such as GtkTreeView with a viewport, the whole widget will scroll, including the column headings. Thus, widgets with native scrolling support should not be used with the GtkViewport proxy.
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.
gtk_scrolled_window_set_placement ()
void gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,GtkCornerType window_placement);
Sets the placement of the contents with respect to the scrollbars for the scrolled window.
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.
See also gtk_scrolled_window_get_placement() and
gtk_scrolled_window_unset_placement().
gtk_scrolled_window_unset_placement ()
void
gtk_scrolled_window_unset_placement (GtkScrolledWindow *scrolled_window);
Unsets the placement of the contents with respect to the scrollbars for the scrolled window. If no window placement is set for a scrolled window, it obeys the "gtk-scrolled-window-placement" XSETTING.
See also gtk_scrolled_window_set_placement() and
gtk_scrolled_window_get_placement().
Since: 2.10
gtk_scrolled_window_set_shadow_type ()
void gtk_scrolled_window_set_shadow_type (GtkScrolledWindow *scrolled_window,GtkShadowType type);
Changes the type of shadow drawn around the contents of
scrolled_window
.
gtk_scrolled_window_set_hadjustment ()
void gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,GtkAdjustment *hadjustment);
Sets the GtkAdjustment for the horizontal scrollbar.
gtk_scrolled_window_set_vadjustment ()
void gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,GtkAdjustment *vadjustment);
Sets the GtkAdjustment for the vertical scrollbar.
gtk_scrolled_window_get_placement ()
GtkCornerType
gtk_scrolled_window_get_placement (GtkScrolledWindow *scrolled_window);
Gets the placement of the contents with respect to the scrollbars
for the scrolled window. See gtk_scrolled_window_set_placement().
Returns
the current placement value.
See also gtk_scrolled_window_set_placement() and
gtk_scrolled_window_unset_placement().
gtk_scrolled_window_get_policy ()
void gtk_scrolled_window_get_policy (GtkScrolledWindow *scrolled_window,GtkPolicyType *hscrollbar_policy,GtkPolicyType *vscrollbar_policy);
Retrieves the current policy values for the horizontal and vertical
scrollbars. See gtk_scrolled_window_set_policy().
gtk_scrolled_window_get_shadow_type ()
GtkShadowType
gtk_scrolled_window_get_shadow_type (GtkScrolledWindow *scrolled_window);
Gets the shadow type of the scrolled window. See
gtk_scrolled_window_set_shadow_type().
Types and Values
struct GtkScrolledWindow
struct GtkScrolledWindow {
GtkWidget *GSEAL (hscrollbar);
GtkWidget *GSEAL (vscrollbar);
};
There are no public fields in the GtkScrolledWindow struct; it should only be accessed using the functions below.
Property Details
The “hadjustment” property
“hadjustment” GtkAdjustment *
The GtkAdjustment for the horizontal position.
Flags: Read / Write / Construct
The “hscrollbar-policy” property
“hscrollbar-policy” GtkPolicyType
When the horizontal scrollbar is displayed.
Flags: Read / Write
Default value: GTK_POLICY_ALWAYS
The “shadow-type” property
“shadow-type” GtkShadowType
Style of bevel around the contents.
Flags: Read / Write
Default value: GTK_SHADOW_NONE
The “vadjustment” property
“vadjustment” GtkAdjustment *
The GtkAdjustment for the vertical position.
Flags: Read / Write / Construct
The “vscrollbar-policy” property
“vscrollbar-policy” GtkPolicyType
When the vertical scrollbar is displayed.
Flags: Read / Write
Default value: GTK_POLICY_ALWAYS
The “window-placement” property
“window-placement” GtkCornerType
Where the contents are located with respect to the scrollbars. This property only takes effect if "window-placement-set" is TRUE.
Flags: Read / Write
Default value: GTK_CORNER_TOP_LEFT
The “window-placement-set” property
“window-placement-set” gboolean
Whether "window-placement" should be used to determine the location of the contents with respect to the scrollbars. Otherwise, the "gtk-scrolled-window-placement" setting is used.
Flags: Read / Write
Default value: FALSE
Since: 2.10
Style Property Details
The “scrollbar-spacing” style property
“scrollbar-spacing” gint
Number of pixels between the scrollbars and the scrolled window.
Flags: Read
Allowed values: >= 0
Default value: 3
Signal Details
The “move-focus-out” signal
void user_function (GtkScrolledWindow *scrolledwindow, GtkDirectionType arg1, gpointer user_data)
Flags: Action
The “scroll-child” signal
gboolean user_function (GtkScrolledWindow *scrolled_window, GtkScrollType scroll, gboolean horizontal, gpointer user_data)
The ::scroll-child signal is a
keybinding signalwhich gets emitted when a keybinding that scrolls is pressed. The horizontal or vertical adjustment is updated which triggers a signal that the scrolled windows child may listen to and scroll itself.
Parameters
scrolled_window |
||
scroll |
a GtkScrollType describing how much to scroll |
|
horizontal |
whether the keybinding scrolls the child horizontally or not |
|
user_data |
user data set when the signal handler was connected. |
Flags: Action
[5] 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.)