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GtkScrolledWindow

GtkScrolledWindow — Adds scrollbars to its child widget

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

Types and Values

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GtkObject
            ╰── GtkWidget
                ╰── GtkContainer
                    ╰── GtkBin
                        ╰── GtkScrolledWindow

Implemented Interfaces

GtkScrolledWindow implements AtkImplementorIface and GtkBuildable.

Includes

#include <gtk/gtk.h>

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.

Parameters

hadjustment

horizontal adjustment.

[allow-none]

vadjustment

vertical adjustment.

[allow-none]

Returns

a new scrolled window


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.

Parameters

scrolled_window

a GtkScrolledWindow

 

Returns

the horizontal GtkAdjustment.

[transfer none]


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.

Parameters

scrolled_window

a GtkScrolledWindow

 

Returns

the vertical GtkAdjustment.

[transfer none]


gtk_scrolled_window_get_hscrollbar ()

GtkWidget *
gtk_scrolled_window_get_hscrollbar (GtkScrolledWindow *scrolled_window);

Returns the horizontal scrollbar of scrolled_window .

Parameters

scrolled_window

a GtkScrolledWindow

 

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 .

Parameters

scrolled_window

a GtkScrolledWindow

 

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).

Parameters

scrolled_window

a GtkScrolledWindow

 

hscrollbar_policy

policy for horizontal bar

 

vscrollbar_policy

policy for vertical bar

 

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.

Parameters

scrolled_window

a GtkScrolledWindow

 

child

the widget you want to scroll

 

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().

Parameters

scrolled_window

a GtkScrolledWindow

 

window_placement

position of the child window

 

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().

Parameters

scrolled_window

a GtkScrolledWindow

 

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 .

Parameters

scrolled_window

a GtkScrolledWindow

 

type

kind of shadow to draw around scrolled window contents

 

gtk_scrolled_window_set_hadjustment ()

void
gtk_scrolled_window_set_hadjustment (GtkScrolledWindow *scrolled_window,
                                     GtkAdjustment *hadjustment);

Sets the GtkAdjustment for the horizontal scrollbar.

Parameters

scrolled_window

a GtkScrolledWindow

 

hadjustment

horizontal scroll adjustment

 

gtk_scrolled_window_set_vadjustment ()

void
gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
                                     GtkAdjustment *vadjustment);

Sets the GtkAdjustment for the vertical scrollbar.

Parameters

scrolled_window

a GtkScrolledWindow

 

vadjustment

vertical scroll adjustment

 

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().

Parameters

scrolled_window

a GtkScrolledWindow

 

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().

Parameters

scrolled_window

a GtkScrolledWindow

 

hscrollbar_policy

location to store the policy for the horizontal scrollbar, or NULL.

[out][allow-none]

vscrollbar_policy

location to store the policy for the vertical scrollbar, or NULL.

[out][allow-none]

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().

Parameters

scrolled_window

a GtkScrolledWindow

 

Returns

the current 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


The “scrollbars-within-bevel” style property

  “scrollbars-within-bevel”  gboolean

Whether to place scrollbars within the scrolled window's bevel.

Flags: Read

Default value: FALSE

Since: 2.12

Signal Details

The “move-focus-out” signal

void
user_function (GtkScrolledWindow *scrolledwindow,
               GtkDirectionType   arg1,
               gpointer           user_data)

Parameters

user_data

user data set when the signal handler was connected.

 

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 signal

which 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

a GtkScrolledWindow

 

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.)

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