Graphics.UI.Gtk.Scrolling.ScrolledWindow

Adds scrollbars to its child widget

Detail

ScrolledWindow is a Bin subclass: it's a container the accepts a single child widget. ScrolledWindow 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 Adjustment objects. Widgets with native scroll support include TreeView, TextView, and Layout.

For widgets that lack native scrolling support, the Viewport widget acts as an adaptor class, implementing scrollability for child widgets that lack their own scrolling capabilities. Use Viewport to scroll child widgets such as Table, Box, and so on.

If a widget has native scrolling abilities, it can be added to the ScrolledWindow with containerAdd. If a widget does not, you must first add the widget to a Viewport, then add the Viewport to the scrolled window. The convenience function scrolledWindowAddWithViewport does exactly this, so you can ignore the presence of the viewport.

The position of the scrollbars is controlled by the scroll adjustments. See Adjustment for the fields in an adjustment - for Scrollbar, used by ScrolledWindow, 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 ScrolledWindow 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 Scrollbar and for example a Table.

Class Hierarchy

 | GObject
 | +----Object
 | +----Widget
 | +----Container
 | +----Bin
 | +----ScrolledWindow

Types

data ScrolledWindow

Instances

Eq ScrolledWindow

Ord ScrolledWindow

GObjectClass ScrolledWindow

ScrolledWindowClass ScrolledWindow

BinClass ScrolledWindow

ContainerClass ScrolledWindow

WidgetClass ScrolledWindow

ObjectClass ScrolledWindow

class BinClass o => ScrolledWindowClass o

Instances

ScrolledWindowClass ScrolledWindow

castToScrolledWindow :: GObjectClass obj => obj -> ScrolledWindow

gTypeScrolledWindow :: GType

toScrolledWindow :: ScrolledWindowClass o => o -> ScrolledWindow

Constructors

scrolledWindowNew

Arguments

:: Maybe Adjustment

hadjustment - Horizontal adjustment.

-> Maybe Adjustment

vadjustment - Vertical adjustment.

-> IO ScrolledWindow

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 Nothing for the adjustments, which will cause the scrolled window to create them for you.

Methods

scrolledWindowGetHAdjustment :: ScrolledWindowClass self => self -> IO Adjustment

Returns the horizontal scrollbar's adjustment, used to connect the horizontal scrollbar to the child widget's horizontal scroll functionality.

scrolledWindowGetVAdjustment :: ScrolledWindowClass self => self -> IO Adjustment

Returns the vertical scrollbar's adjustment, used to connect the vertical scrollbar to the child widget's vertical scroll functionality.

data PolicyType

Constructors

PolicyAlways

PolicyAutomatic

PolicyNever

Instances

Enum PolicyType

Eq PolicyType

Show PolicyType

scrolledWindowSetPolicy

Arguments

:: ScrolledWindowClass self

=> self

-> PolicyType

hscrollbarPolicy - Policy for horizontal bar.

-> PolicyType

vscrollbarPolicy - Policy for vertical bar.

-> IO ()

Sets the scrollbar policy for the horizontal and vertical scrollbars. The policy determines when the scrollbar should appear; it is a value from the PolicyType enumeration. If PolicyAlways, the scrollbar is always present; if PolicyNever, the scrollbar is never present; if PolicyAutomatic, 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).

scrolledWindowGetPolicy

Arguments

:: ScrolledWindowClass self

=> self

-> IO (PolicyType, PolicyType)

(hscrollbarPolicy, vscrollbarPolicy)

Retrieves the current policy values for the horizontal and vertical scrollbars. See scrolledWindowSetPolicy.

scrolledWindowAddWithViewport

Arguments

:: (ScrolledWindowClass self, WidgetClass child)

=> self

-> child

child - Widget you want to scroll.

-> IO ()

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 containerAdd instead of this function.

The viewport scrolls the child by moving its DrawWindow, and takes the size of the child to be the size of its toplevel DrawWindow. This will be very wrong for most widgets that support native scrolling; for example, if you add a widget such as TreeView with a viewport, the whole widget will scroll, including the column headings. Thus, widgets with native scrolling support should not be used with the Viewport proxy.

data CornerType

Specifies in which corner a child widget should be placed

Constructors

CornerTopLeft

CornerBottomLeft

CornerTopRight

CornerBottomRight

Instances

Enum CornerType

Eq CornerType

Show CornerType

scrolledWindowSetPlacement

Arguments

:: ScrolledWindowClass self

=> self

-> CornerType

windowPlacement - Position of the child window.

-> IO ()

Determines the location of the child widget with respect to the scrollbars. The default is CornerTopLeft, meaning the child is in the top left, with the scrollbars underneath and to the right. Other values in CornerType are CornerTopRight, CornerBottomLeft, and CornerBottomRight.

scrolledWindowGetPlacement :: ScrolledWindowClass self => self -> IO CornerType

Gets the placement of the scrollbars for the scrolled window. See scrolledWindowSetPlacement.

data ShadowType

Shadow types

Constructors

ShadowNone

ShadowIn

ShadowOut

ShadowEtchedIn

ShadowEtchedOut

Instances

Enum ShadowType

Eq ShadowType

Show ShadowType

scrolledWindowSetShadowType :: ScrolledWindowClass self => self -> ShadowType -> IO ()

Changes the type of shadow drawn around the contents of scrolledWindow.

scrolledWindowGetShadowType :: ScrolledWindowClass self => self -> IO ShadowType

Gets the shadow type of the scrolled window. See scrolledWindowSetShadowType.

scrolledWindowSetHAdjustment :: ScrolledWindowClass self => self -> Adjustment -> IO ()

Sets the Adjustment for the horizontal scrollbar.

scrolledWindowSetVAdjustment

Arguments

:: ScrolledWindowClass self

=> self

-> Adjustment

vadjustment - Vertical scroll adjustment.

-> IO ()

Sets the Adjustment for the vertical scrollbar.

scrolledWindowGetHScrollbar

Arguments

:: ScrolledWindowClass self

=> self

-> IO (Maybe HScrollbar)

returns the horizontal scrollbar of the scrolled window, or Nothing if it does not have one.

Returns the horizontal scrollbar of scrolledWindow.

• Available since Gtk+ version 2.8

scrolledWindowGetVScrollbar

Arguments

:: ScrolledWindowClass self

=> self

-> IO (Maybe VScrollbar)

returns the vertical scrollbar of the scrolled window, or Nothing if it does not have one.

Returns the vertical scrollbar of scrolledWindow.

• Available since Gtk+ version 2.8

Attributes

scrolledWindowHAdjustment :: ScrolledWindowClass self => Attr self Adjustment

The Adjustment for the horizontal position.

scrolledWindowVAdjustment :: ScrolledWindowClass self => Attr self Adjustment

The Adjustment for the vertical position.

scrolledWindowHscrollbarPolicy :: ScrolledWindowClass self => Attr self PolicyType

When the horizontal scrollbar is displayed.

Default value: PolicyAlways

scrolledWindowVscrollbarPolicy :: ScrolledWindowClass self => Attr self PolicyType

When the vertical scrollbar is displayed.

Default value: PolicyAlways

scrolledWindowWindowPlacement :: ScrolledWindowClass self => Attr self CornerType

Where the contents are located with respect to the scrollbars.

Default value: CornerTopLeft

scrolledWindowShadowType :: ScrolledWindowClass self => Attr self ShadowType

Style of bevel around the contents.

Default value: ShadowNone

scrolledWindowPlacement :: ScrolledWindowClass self => Attr self CornerType

'placement' property. See scrolledWindowGetPlacement and scrolledWindowSetPlacement