Graphics.UI.Gtk.Layout.Expander

A container which can hide its child

• Module available since Gtk+ version 2.4

Detail

A Expander allows the user to hide or show its child by clicking on an expander triangle similar to the triangles used in a TreeView.

Normally you use an expander as you would use any other descendant of Bin; you create the child widget and use containerAdd to add it to the expander. When the expander is toggled, it will take care of showing and hiding the child automatically.

Class Hierarchy

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

Types

data Expander

Instances

Eq Expander

Ord Expander

GObjectClass Expander

ExpanderClass Expander

BinClass Expander

ContainerClass Expander

WidgetClass Expander

ObjectClass Expander

class BinClass o => ExpanderClass o

Instances

ExpanderClass Expander

castToExpander :: GObjectClass obj => obj -> Expander

gTypeExpander :: GType

toExpander :: ExpanderClass o => o -> Expander

Constructors

expanderNew :: GlibString string => string -> IO Expander

Creates a new expander using the given string as the text of the label.

expanderNewWithMnemonic

Arguments

:: GlibString string

=> string

label - the text of the label with an underscore in front of the mnemonic character

-> IO Expander

Creates a new expander using label as the text of the label. If characters in label are preceded by an underscore, they are underlined. If you need a literal underscore character in a label, use '__' (two underscores). The first underlined character represents a keyboard accelerator called a mnemonic. Pressing Alt and that key activates the button.

Methods

expanderSetExpanded :: Expander -> Bool -> IO ()

Sets the state of the expander. Set to True, if you want the child widget to be revealed, and False if you want the child widget to be hidden.

expanderGetExpanded :: Expander -> IO Bool

Queries a Expander and returns its current state. Returns True if the child widget is revealed.

See expanderSetExpanded.

expanderSetSpacing :: Expander -> Int -> IO ()

Sets the spacing field of expander, which is the number of pixels to place between expander and the child.

expanderGetSpacing

Arguments

:: Expander

-> IO Int

returns spacing between the expander and child.

Gets the value set by expanderSetSpacing.

expanderSetLabel :: GlibString string => Expander -> string -> IO ()

Sets the text of the label of the expander to label.

This will also clear any previously set labels.

expanderGetLabel :: GlibString string => Expander -> IO string

Fetches the text from the label of the expander, as set by expanderSetLabel.

expanderSetUseUnderline

Arguments

:: Expander

-> Bool

useUnderline - True if underlines in the text indicate mnemonics

-> IO ()

If true, an underline in the text of the expander label indicates the next character should be used for the mnemonic accelerator key.

expanderGetUseUnderline

Arguments

:: Expander

-> IO Bool

returns True if an embedded underline in the expander label indicates the mnemonic accelerator keys.

Returns whether an embedded underline in the expander label indicates a mnemonic. See expanderSetUseUnderline.

expanderSetUseMarkup

Arguments

:: Expander

-> Bool

useMarkup - True if the label's text should be parsed for markup

-> IO ()

Sets whether the text of the label contains markup in Pango's text markup language. See labelSetMarkup.

expanderGetUseMarkup :: Expander -> IO Bool

Returns whether the label's text is interpreted as marked up with the Pango text markup language. See expanderSetUseMarkup.

expanderSetLabelWidget

Arguments

:: WidgetClass labelWidget

=> Expander

-> labelWidget

labelWidget - the new label widget

-> IO ()

Set the label widget for the expander. This is the widget that will appear embedded alongside the expander arrow.

expanderGetLabelWidget

Arguments

:: Expander

-> IO Widget

returns the label widget

Retrieves the label widget for the frame. See expanderSetLabelWidget.

Attributes

expanderExpanded :: Attr Expander Bool

Whether the expander has been opened to reveal the child widget.

Default value: False

expanderLabel :: GlibString string => Attr Expander string

Text of the expander's label.

expanderUseUnderline :: Attr Expander Bool

If set, an underline in the text indicates the next character should be used for the mnemonic accelerator key.

Default value: False

expanderUseMarkup :: Attr Expander Bool

The text of the label includes XML markup. See pango_parse_markup().

Default value: False

expanderSpacing :: Attr Expander Int

Space to put between the label and the child.

Allowed values: >= 0

Default value: 0

expanderLabelWidget :: WidgetClass labelWidget => ReadWriteAttr Expander Widget labelWidget

A widget to display in place of the usual expander label.

expanderLabelFill :: Attr Expander Bool

Whether the label widget should fill all available horizontal space.

Default value: False

Signals

onActivate :: Expander -> IO () -> IO (ConnectId Expander)

afterActivate :: Expander -> IO () -> IO (ConnectId Expander)