gtk-0.12.2: Binding to the Gtk+ graphical user interface library.

Portability | portable (depends on GHC)
Stability | provisional
Maintainer | gtk2hs-users@lists.sourceforge.net

Graphics.UI.Gtk.Abstract.Widget

Contents

- Detail
- Class Hierarchy
- Types
- Methods
- Attributes
- Signals
- Events
- Deprecated

Description

The base class for all widgets.

Synopsis

- data Widget
- class ObjectClass o => WidgetClass o
- castToWidget :: GObjectClass obj => obj -> Widget
- gTypeWidget :: GType
- toWidget :: WidgetClass o => o -> Widget
- data EventMask
  - = ExposureMask
  - | PointerMotionMask
  - | PointerMotionHintMask
  - | ButtonMotionMask
  - | Button1MotionMask
  - | Button2MotionMask
  - | Button3MotionMask
  - | ButtonPressMask
  - | ButtonReleaseMask
  - | KeyPressMask
  - | KeyReleaseMask
  - | EnterNotifyMask
  - | LeaveNotifyMask
  - | FocusChangeMask
  - | StructureMask
  - | PropertyChangeMask
  - | VisibilityNotifyMask
  - | ProximityInMask
  - | ProximityOutMask
  - | SubstructureMask
  - | ScrollMask
  - | AllEventsMask
- data ExtensionMode
  - = ExtensionEventsNone
  - | ExtensionEventsAll
  - | ExtensionEventsCursor
- type GType = CULong
- type KeyVal = Word32
- data Region
- type Bitmap = Pixmap
- data Requisition = Requisition Int Int
- data Rectangle = Rectangle Int Int Int Int
- data Color
- data IconSize
  - = IconSizeInvalid
  - | IconSizeMenu
  - | IconSizeSmallToolbar
  - | IconSizeLargeToolbar
  - | IconSizeButton
  - | IconSizeDnd
  - | IconSizeDialog
  - | IconSizeUser Int
- data StateType
  - = StateNormal
  - | StateActive
  - | StatePrelight
  - | StateSelected
  - | StateInsensitive
- data TextDirection
  - = TextDirNone
  - | TextDirLtr
  - | TextDirRtl
- data AccelFlags
  - = AccelVisible
  - | AccelLocked
  - | AccelMask
- data DirectionType
  - = DirTabForward
  - | DirTabBackward
  - | DirUp
  - | DirDown
  - | DirLeft
  - | DirRight
- type StockId = String
- data WidgetHelpType
  - = WidgetHelpTooltip
  - | WidgetHelpWhatsThis
- widgetShow :: WidgetClass self => self -> IO ()
- widgetShowNow :: WidgetClass self => self -> IO ()
- widgetHide :: WidgetClass self => self -> IO ()
- widgetShowAll :: WidgetClass self => self -> IO ()
- widgetHideAll :: WidgetClass self => self -> IO ()
- widgetDestroy :: WidgetClass self => self -> IO ()
- widgetQueueDraw :: WidgetClass self => self -> IO ()
- widgetQueueResize :: WidgetClass self => self -> IO ()
- widgetQueueResizeNoRedraw :: WidgetClass self => self -> IO ()
- widgetSizeRequest :: WidgetClass self => self -> IO Requisition
- widgetGetChildRequisition :: WidgetClass self => self -> IO Requisition
- widgetSizeAllocate :: WidgetClass self => self -> Allocation -> IO ()
- widgetAddAccelerator :: WidgetClass self => self -> String -> AccelGroup -> KeyVal -> [Modifier] -> [AccelFlags] -> IO ()
- widgetRemoveAccelerator :: WidgetClass self => self -> AccelGroup -> KeyVal -> [Modifier] -> IO Bool
- widgetSetAccelPath :: WidgetClass self => self -> String -> AccelGroup -> IO ()
- widgetCanActivateAccel :: WidgetClass self => ConnectId self -> IO Bool
- widgetActivate :: WidgetClass self => self -> IO Bool
- widgetIntersect :: WidgetClass self => self -> Rectangle -> IO (Maybe Rectangle)
- widgetHasIntersection :: WidgetClass self => self -> Rectangle -> IO Bool
- widgetGetIsFocus :: WidgetClass self => self -> IO Bool
- widgetGrabFocus :: WidgetClass self => self -> IO ()
- widgetGrabDefault :: WidgetClass self => self -> IO ()
- widgetSetName :: WidgetClass self => self -> String -> IO ()
- widgetGetName :: WidgetClass self => self -> IO String
- widgetSetSensitive :: WidgetClass self => self -> Bool -> IO ()
- widgetSetSensitivity :: WidgetClass self => self -> Bool -> IO ()
- widgetGetParentWindow :: WidgetClass self => self -> IO DrawWindow
- widgetGetDrawWindow :: WidgetClass widget => widget -> IO DrawWindow
- widgetDelEvents :: WidgetClass self => self -> [EventMask] -> IO ()
- widgetAddEvents :: WidgetClass self => self -> [EventMask] -> IO ()
- widgetGetEvents :: WidgetClass self => self -> IO [EventMask]
- widgetSetEvents :: WidgetClass self => self -> [EventMask] -> IO ()
- widgetSetExtensionEvents :: WidgetClass self => self -> [ExtensionMode] -> IO ()
- widgetGetExtensionEvents :: WidgetClass self => self -> IO [ExtensionMode]
- widgetGetToplevel :: WidgetClass self => self -> IO Widget
- widgetGetAncestor :: WidgetClass self => self -> GType -> IO (Maybe Widget)
- widgetGetColormap :: WidgetClass self => self -> IO Colormap
- widgetSetColormap :: WidgetClass self => self -> Colormap -> IO ()
- widgetGetPointer :: WidgetClass self => self -> IO (Int, Int)
- widgetIsAncestor :: (WidgetClass self, WidgetClass ancestor) => self -> ancestor -> IO Bool
- widgetTranslateCoordinates :: (WidgetClass self, WidgetClass destWidget) => self -> destWidget -> Int -> Int -> IO (Maybe (Int, Int))
- widgetSetStyle :: WidgetClass self => self -> Maybe Style -> IO ()
- widgetGetStyle :: WidgetClass widget => widget -> IO Style
- widgetPushColormap :: Colormap -> IO ()
- widgetPopColormap :: IO ()
- widgetSetDefaultColormap :: Colormap -> IO ()
- widgetGetDefaultStyle :: IO Style
- widgetGetDefaultColormap :: IO Colormap
- widgetSetDirection :: WidgetClass self => self -> TextDirection -> IO ()
- widgetGetDirection :: WidgetClass self => self -> IO TextDirection
- widgetSetDefaultDirection :: TextDirection -> IO ()
- widgetGetDefaultDirection :: IO TextDirection
- widgetShapeCombineMask :: WidgetClass self => self -> Maybe Bitmap -> Int -> Int -> IO ()
- widgetInputShapeCombineMask :: WidgetClass self => self -> Maybe Bitmap -> Int -> Int -> IO ()
- widgetGetTooltipWindow :: WidgetClass self => self -> IO Window
- widgetSetTooltipWindow :: (WidgetClass self, WindowClass customWindow) => self -> Maybe customWindow -> IO ()
- widgetTriggerTooltipQuery :: WidgetClass self => self -> IO ()
- widgetGetSnapshot :: WidgetClass self => self -> Rectangle -> IO (Maybe Pixmap)
- widgetPath :: WidgetClass self => self -> IO (Int, String, String)
- widgetClassPath :: WidgetClass self => self -> IO (Int, String, String)
- widgetGetCompositeName :: WidgetClass self => self -> IO (Maybe String)
- widgetModifyStyle :: (WidgetClass self, RcStyleClass style) => self -> style -> IO ()
- widgetGetModifierStyle :: WidgetClass self => self -> IO RcStyle
- widgetModifyFg :: WidgetClass self => self -> StateType -> Color -> IO ()
- widgetModifyBg :: WidgetClass self => self -> StateType -> Color -> IO ()
- widgetModifyText :: WidgetClass self => self -> StateType -> Color -> IO ()
- widgetModifyBase :: WidgetClass self => self -> StateType -> Color -> IO ()
- widgetModifyFont :: WidgetClass self => self -> Maybe FontDescription -> IO ()
- widgetCreatePangoContext :: WidgetClass self => self -> IO PangoContext
- widgetGetPangoContext :: WidgetClass self => self -> IO PangoContext
- widgetCreateLayout :: WidgetClass self => self -> String -> IO PangoLayout
- widgetRenderIcon :: WidgetClass self => self -> String -> IconSize -> String -> IO (Maybe Pixbuf)
- widgetQueueDrawArea :: WidgetClass self => self -> Int -> Int -> Int -> Int -> IO ()
- widgetResetShapes :: WidgetClass self => self -> IO ()
- widgetSetAppPaintable :: WidgetClass self => self -> Bool -> IO ()
- widgetSetDoubleBuffered :: WidgetClass self => self -> Bool -> IO ()
- widgetSetRedrawOnAllocate :: WidgetClass self => self -> Bool -> IO ()
- widgetSetCompositeName :: WidgetClass self => self -> String -> IO ()
- widgetSetScrollAdjustments :: WidgetClass self => self -> Maybe Adjustment -> Maybe Adjustment -> IO Bool
- widgetRegionIntersect :: WidgetClass self => self -> Region -> IO Region
- widgetGetAccessible :: WidgetClass self => self -> IO Object
- widgetChildFocus :: WidgetClass self => self -> DirectionType -> IO Bool
- widgetGetChildVisible :: WidgetClass self => self -> IO Bool
- widgetGetParent :: WidgetClass self => self -> IO (Maybe Widget)
- widgetGetSettings :: WidgetClass self => self -> IO Settings
- widgetGetClipboard :: WidgetClass self => self -> SelectionTag -> IO Clipboard
- widgetGetDisplay :: WidgetClass self => self -> IO Display
- widgetGetRootWindow :: WidgetClass self => self -> IO DrawWindow
- widgetGetScreen :: WidgetClass self => self -> IO Screen
- widgetHasScreen :: WidgetClass self => self -> IO Bool
- widgetGetSizeRequest :: WidgetClass self => self -> IO (Int, Int)
- widgetSetChildVisible :: WidgetClass self => self -> Bool -> IO ()
- widgetSetSizeRequest :: WidgetClass self => self -> Int -> Int -> IO ()
- widgetSetNoShowAll :: WidgetClass self => self -> Bool -> IO ()
- widgetGetNoShowAll :: WidgetClass self => self -> IO Bool
- widgetListMnemonicLabels :: WidgetClass self => self -> IO [Widget]
- widgetAddMnemonicLabel :: (WidgetClass self, WidgetClass label) => self -> label -> IO ()
- widgetRemoveMnemonicLabel :: (WidgetClass self, WidgetClass label) => self -> label -> IO ()
- widgetGetAction :: WidgetClass self => self -> IO (Maybe Action)
- widgetIsComposited :: WidgetClass self => self -> IO Bool
- widgetReparent :: (WidgetClass self, WidgetClass newParent) => self -> newParent -> IO ()
- widgetGetCanFocus :: WidgetClass self => self -> IO Bool
- widgetSetCanFocus :: WidgetClass self => self -> Bool -> IO ()
- widgetGetAllocation :: WidgetClass self => self -> IO Allocation
- widgetGetState :: WidgetClass self => self -> IO StateType
- widgetSetState :: WidgetClass self => self -> StateType -> IO ()
- widgetGetSavedState :: WidgetClass w => w -> IO StateType
- widgetGetSize :: WidgetClass widget => widget -> IO (Int, Int)
- widgetEvent :: WidgetClass self => self -> EventM t Bool
- widgetName :: WidgetClass self => Attr self (Maybe String)
- widgetParent :: (WidgetClass self, ContainerClass container) => ReadWriteAttr self (Maybe Container) (Maybe container)
- widgetWidthRequest :: WidgetClass self => Attr self Int
- widgetHeightRequest :: WidgetClass self => Attr self Int
- widgetVisible :: WidgetClass self => Attr self Bool
- widgetSensitive :: WidgetClass self => Attr self Bool
- widgetAppPaintable :: WidgetClass self => Attr self Bool
- widgetCanFocus :: WidgetClass self => Attr self Bool
- widgetHasFocus :: WidgetClass self => Attr self Bool
- widgetIsFocus :: WidgetClass self => Attr self Bool
- widgetCanDefault :: WidgetClass self => Attr self Bool
- widgetHasDefault :: WidgetClass self => Attr self Bool
- widgetReceivesDefault :: WidgetClass self => Attr self Bool
- widgetCompositeChild :: WidgetClass self => ReadAttr self Bool
- widgetStyle :: WidgetClass self => Attr self Style
- widgetState :: WidgetClass self => Attr self StateType
- widgetEvents :: WidgetClass self => Attr self [EventMask]
- widgetExtensionEvents :: WidgetClass self => Attr self [ExtensionMode]
- widgetNoShowAll :: WidgetClass self => Attr self Bool
- widgetChildVisible :: WidgetClass self => Attr self Bool
- widgetColormap :: WidgetClass self => Attr self Colormap
- widgetCompositeName :: WidgetClass self => ReadWriteAttr self (Maybe String) String
- widgetDirection :: WidgetClass self => Attr self TextDirection
- widgetTooltipMarkup :: WidgetClass self => Attr self (Maybe Markup)
- widgetTooltipText :: WidgetClass self => Attr self (Maybe String)
- widgetHasTooltip :: WidgetClass self => Attr self Bool
- widgetHasRcStyle :: WidgetClass self => self -> IO Bool
- widgetGetRealized :: WidgetClass self => self -> IO Bool
- widgetGetMapped :: WidgetClass self => self -> IO Bool
- realize :: WidgetClass self => Signal self (IO ())
- unrealize :: WidgetClass self => Signal self (IO ())
- mapSignal :: WidgetClass self => Signal self (IO ())
- unmapSignal :: WidgetClass self => Signal self (IO ())
- sizeRequest :: WidgetClass self => Signal self (IO Requisition)
- sizeAllocate :: WidgetClass self => Signal self (Allocation -> IO ())
- showSignal :: WidgetClass self => Signal self (IO ())
- hideSignal :: WidgetClass self => Signal self (IO ())
- focus :: WidgetClass self => Signal self (DirectionType -> IO Bool)
- stateChanged :: WidgetClass self => Signal self (StateType -> IO ())
- parentSet :: WidgetClass self => Signal self (Maybe Widget -> IO ())
- hierarchyChanged :: WidgetClass self => Signal self (Maybe Widget -> IO ())
- styleSet :: WidgetClass self => Signal self (Style -> IO ())
- directionChanged :: WidgetClass self => Signal self (TextDirection -> IO ())
- grabNotify :: WidgetClass self => Signal self (Bool -> IO ())
- popupMenuSignal :: WidgetClass self => Signal self (IO Bool)
- showHelp :: WidgetClass self => Signal self (WidgetHelpType -> IO Bool)
- accelClosuresChanged :: WidgetClass self => Signal self (IO ())
- screenChanged :: WidgetClass self => Signal self (Screen -> IO ())
- queryTooltip :: WidgetClass self => Signal self (Widget -> Maybe Point -> Tooltip -> IO Bool)
- buttonPressEvent :: WidgetClass self => Signal self (EventM EButton Bool)
- buttonReleaseEvent :: WidgetClass self => Signal self (EventM EButton Bool)
- configureEvent :: WidgetClass self => Signal self (EventM EConfigure Bool)
- deleteEvent :: WidgetClass self => Signal self (EventM EAny Bool)
- destroyEvent :: WidgetClass self => Signal self (EventM EAny Bool)
- enterNotifyEvent :: WidgetClass self => Signal self (EventM ECrossing Bool)
- exposeEvent :: WidgetClass self => Signal self (EventM EExpose Bool)
- focusInEvent :: WidgetClass self => Signal self (EventM EFocus Bool)
- focusOutEvent :: WidgetClass self => Signal self (EventM EFocus Bool)
- grabBrokenEvent :: WidgetClass self => Signal self (EventM EGrabBroken Bool)
- keyPressEvent :: WidgetClass self => Signal self (EventM EKey Bool)
- keyReleaseEvent :: WidgetClass self => Signal self (EventM EKey Bool)
- leaveNotifyEvent :: WidgetClass self => Signal self (EventM ECrossing Bool)
- mapEvent :: WidgetClass self => Signal self (EventM EAny Bool)
- motionNotifyEvent :: WidgetClass self => Signal self (EventM EMotion Bool)
- noExposeEvent :: WidgetClass self => Signal self (EventM EAny Bool)
- proximityInEvent :: WidgetClass self => Signal self (EventM EProximity Bool)
- proximityOutEvent :: WidgetClass self => Signal self (EventM EProximity Bool)
- scrollEvent :: WidgetClass self => Signal self (EventM EScroll Bool)
- unmapEvent :: WidgetClass self => Signal self (EventM EAny Bool)
- visibilityNotifyEvent :: WidgetClass self => Signal self (EventM EVisibility Bool)
- windowStateEvent :: WidgetClass self => Signal self (EventM EWindowState Bool)
- onButtonPress :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterButtonPress :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onButtonRelease :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterButtonRelease :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onClient :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterClient :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onConfigure :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterConfigure :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onDelete :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterDelete :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onDestroyEvent :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterDestroyEvent :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onDirectionChanged :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterDirectionChanged :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onEnterNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterEnterNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onLeaveNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterLeaveNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onExpose :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterExpose :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onExposeRect :: WidgetClass w => w -> (Rectangle -> IO ()) -> IO (ConnectId w)
- afterExposeRect :: WidgetClass w => w -> (Rectangle -> IO ()) -> IO (ConnectId w)
- onFocus :: WidgetClass w => w -> (DirectionType -> IO Bool) -> IO (ConnectId w)
- afterFocus :: WidgetClass w => w -> (DirectionType -> IO Bool) -> IO (ConnectId w)
- onFocusIn :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterFocusIn :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onFocusOut :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterFocusOut :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onGrabFocus :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- afterGrabFocus :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- onDestroy :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- afterDestroy :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- onHide :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- afterHide :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- onHierarchyChanged :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- afterHierarchyChanged :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- onKeyPress :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterKeyPress :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onKeyRelease :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterKeyRelease :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onMnemonicActivate :: WidgetClass w => w -> (Bool -> IO Bool) -> IO (ConnectId w)
- afterMnemonicActivate :: WidgetClass w => w -> (Bool -> IO Bool) -> IO (ConnectId w)
- onMotionNotify :: WidgetClass w => w -> Bool -> (Event -> IO Bool) -> IO (ConnectId w)
- afterMotionNotify :: WidgetClass w => w -> Bool -> (Event -> IO Bool) -> IO (ConnectId w)
- onParentSet :: (WidgetClass w, WidgetClass old) => w -> (old -> IO ()) -> IO (ConnectId w)
- afterParentSet :: (WidgetClass w, WidgetClass old) => w -> (old -> IO ()) -> IO (ConnectId w)
- onPopupMenu :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- afterPopupMenu :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- onProximityIn :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterProximityIn :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onProximityOut :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterProximityOut :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onRealize :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- afterRealize :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- onScroll :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterScroll :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onShow :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- afterShow :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- onSizeAllocate :: WidgetClass w => w -> (Allocation -> IO ()) -> IO (ConnectId w)
- afterSizeAllocate :: WidgetClass w => w -> (Allocation -> IO ()) -> IO (ConnectId w)
- onSizeRequest :: WidgetClass w => w -> IO Requisition -> IO (ConnectId w)
- afterSizeRequest :: WidgetClass w => w -> IO Requisition -> IO (ConnectId w)
- onStateChanged :: WidgetClass w => w -> (StateType -> IO ()) -> IO (ConnectId w)
- afterStateChanged :: WidgetClass w => w -> (StateType -> IO ()) -> IO (ConnectId w)
- onUnmap :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- afterUnmap :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- onUnrealize :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- afterUnrealize :: WidgetClass w => w -> IO () -> IO (ConnectId w)
- onVisibilityNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterVisibilityNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- onWindowState :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)
- afterWindowState :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

# Detail

The base class for all widgets. While a widget cannot be created directly, this module contains many useful methods common to all widgets. In particular, these functions are needed to add functionality to blank widgets such as `DrawingArea` or `Layout`.

`Widget` introduces style properties - these are basically object properties that are stored not on the object, but in the style object associated to the widget. Style properties are set in resource files. This mechanism is used for configuring such things as the location of the scrollbar arrows through the theme, giving theme authors more control over the look of applications without the need to write a theme engine in C.

Widgets receive events, that is, signals that indicate some low-level user iteraction. The signal handlers for all these events have to return `True` if the signal has been dealt with and `False` if other signal handlers should be run.

# Class Hierarchy

     | GObject
     | +----Object
     | +----Widget
     | +----too many to list

# Types

data Widget

Instances

Eq Widget |
Ord Widget |
GObjectClass Widget |
WidgetClass Widget |
ObjectClass Widget |

class ObjectClass o => WidgetClass o

Instances

WidgetClass ProgressBar |
WidgetClass Preview |
WidgetClass Invisible |
WidgetClass VSeparator |
WidgetClass HSeparator |
WidgetClass Separator |
WidgetClass VScrollbar |
WidgetClass HScrollbar |
WidgetClass Scrollbar |
WidgetClass VScale |
WidgetClass HScale |
WidgetClass Scale |
WidgetClass Range |
WidgetClass VRuler |
WidgetClass HRuler |
WidgetClass Ruler |
WidgetClass SpinButton |
WidgetClass Entry |
WidgetClass Spinner |
WidgetClass DrawingArea |
WidgetClass CellView |
WidgetClass Calendar |
WidgetClass TreeView |
WidgetClass Toolbar |
WidgetClass TextView |
WidgetClass Table |
WidgetClass Socket |
WidgetClass Notebook |
WidgetClass MenuBar |
WidgetClass RecentChooserMenu |
WidgetClass Menu |
WidgetClass MenuShell |
WidgetClass List |
WidgetClass Layout |
WidgetClass IconView |
WidgetClass VPaned |
WidgetClass HPaned |
WidgetClass Paned |
WidgetClass Fixed |
WidgetClass CTree |
WidgetClass CList |
WidgetClass Statusbar |
WidgetClass FileChooserButton |
WidgetClass Combo |
WidgetClass InfoBar |
WidgetClass HBox |
WidgetClass FileChooserWidget |
WidgetClass FontSelection |
WidgetClass ColorSelection |
WidgetClass RecentChooserWidget |
WidgetClass VBox |
WidgetClass VButtonBox |
WidgetClass HButtonBox |
WidgetClass ButtonBox |
WidgetClass Box |
WidgetClass SeparatorToolItem |
WidgetClass RadioToolButton |
WidgetClass ToggleToolButton |
WidgetClass MenuToolButton |
WidgetClass ToolButton |
WidgetClass ToolItem |
WidgetClass ComboBoxEntry |
WidgetClass ComboBox |
WidgetClass Expander |
WidgetClass Viewport |
WidgetClass ScrolledWindow |
WidgetClass HandleBox |
WidgetClass EventBox |
WidgetClass Plug |
WidgetClass MessageDialog |
WidgetClass InputDialog |
WidgetClass FontSelectionDialog |
WidgetClass FileChooserDialog |
WidgetClass FileSelection |
WidgetClass ColorSelectionDialog |
WidgetClass AboutDialog |
WidgetClass Dialog |
WidgetClass OffscreenWindow |
WidgetClass Assistant |
WidgetClass Window |
WidgetClass ListItem |
WidgetClass SeparatorMenuItem |
WidgetClass ImageMenuItem |
WidgetClass TearoffMenuItem |
WidgetClass RadioMenuItem |
WidgetClass CheckMenuItem |
WidgetClass MenuItem |
WidgetClass Item |
WidgetClass OptionMenu |
WidgetClass FontButton |
WidgetClass ColorButton |
WidgetClass RadioButton |
WidgetClass CheckButton |
WidgetClass ToggleButton |
WidgetClass LinkButton |
WidgetClass VolumeButton |
WidgetClass ScaleButton |
WidgetClass Button |
WidgetClass AspectFrame |
WidgetClass Frame |
WidgetClass Alignment |
WidgetClass Bin |
WidgetClass ToolItemGroup |
WidgetClass ToolPalette |
WidgetClass Container |
WidgetClass Image |
WidgetClass Arrow |
WidgetClass TipsQuery |
WidgetClass AccelLabel |
WidgetClass Label |
WidgetClass Misc |
WidgetClass HSV |
WidgetClass Widget |

castToWidget :: GObjectClass obj => obj -> Widget

gTypeWidget :: GType

toWidget :: WidgetClass o => o -> Widget

data EventMask

Specify which events a widget will emit signals on.

Constructors

ExposureMask |
PointerMotionMask |
PointerMotionHintMask |
ButtonMotionMask |
Button1MotionMask |
Button2MotionMask |
Button3MotionMask |
ButtonPressMask |
ButtonReleaseMask |
KeyPressMask |
KeyReleaseMask |
EnterNotifyMask |
LeaveNotifyMask |
FocusChangeMask |
StructureMask |
PropertyChangeMask |
VisibilityNotifyMask |
ProximityInMask |
ProximityOutMask |
SubstructureMask |
ScrollMask |
AllEventsMask |

Instances

Bounded EventMask |
Enum EventMask |
Eq EventMask |
Show EventMask |
Flags EventMask |

data ExtensionMode

specify which input extension a widget desires

Constructors

ExtensionEventsNone |
ExtensionEventsAll |
ExtensionEventsCursor |

Instances

Bounded ExtensionMode |
Enum ExtensionMode |
Eq ExtensionMode |
Show ExtensionMode |
Flags ExtensionMode |

type GType = CULong

type KeyVal = Word32

Key values are the codes which are sent whenever a key is pressed or released.

data Region

Instances

Show Region |

type Bitmap = Pixmap

A `Bitmap` is a special `Pixmap` in that the number of bits per pixel is one, that is, a pixel is either set or unset. Whenever a function expects a `Bitmap`, a `Pixmap` of depth one must be supplied.

data Requisition

Requisition

- For `Graphics.UI.Gtk.Abstract.Widget.widgetSizeRequest`. The values represent the desired width and height of the widget.

Constructors

Requisition Int Int |

Instances

Eq Requisition |
Show Requisition |
Storable Requisition |

data Rectangle

Rectangle

- Specifies x, y, width and height

Constructors

Rectangle Int Int Int Int |

Instances

Eq Rectangle |
Show Rectangle |
Storable Rectangle |

data Color

Color

- Specifies a color with three integer values for red, green and blue. All values range from 0 (least intense) to 65535 (highest intensity).

Instances

Eq Color |
Show Color |
Storable Color |

data IconSize

The size of an icon in pixels.

- This enumeration contains one case that is not exported and which is used when new sizes are registered using `Graphics.UI.Gtk.General.IconFactory.iconSizeRegister`.
- Applying `show` to this type will reveal the name of the size that is registered with Gtk+.

Constructors

IconSizeInvalid | Don't scale but use any of the available sizes.
IconSizeMenu | Icon size to use in next to menu items in drop-down menus.
IconSizeSmallToolbar | Icon size for small toolbars.
IconSizeLargeToolbar | Icon size for larger toolbars.
IconSizeButton | Icon size for icons in buttons, next to the label.
IconSizeDnd | Icon size for icons in drag-and-drop.
IconSizeDialog | Icon size for icons next to dialog text.
IconSizeUser Int |

Instances

Enum IconSize |
Eq IconSize |
Show IconSize |

data StateType

Widget states

Constructors

StateNormal |
StateActive |
StatePrelight |
StateSelected |
StateInsensitive |

Instances

Enum StateType |
Eq StateType |
Show StateType |

data TextDirection

Constructors

TextDirNone |
TextDirLtr |
TextDirRtl |

Instances

Enum TextDirection |
Eq TextDirection |
Show TextDirection |

data AccelFlags

State of an accelerator

Constructors

AccelVisible |
AccelLocked |
AccelMask |

Instances

Bounded AccelFlags |
Enum AccelFlags | Arrow directions for the arrow widget
Eq AccelFlags |
Show AccelFlags |
Flags AccelFlags |

data DirectionType

Editing direction

Constructors

DirTabForward |
DirTabBackward |
DirUp |
DirDown |
DirLeft |
DirRight |

Instances

Enum DirectionType |
Eq DirectionType |
Show DirectionType |

type StockId = String

A synonym for a standard button or icon.

data WidgetHelpType

Specify what kind of help the user wants.

Constructors

WidgetHelpTooltip |
WidgetHelpWhatsThis |

Instances

Enum WidgetHelpType |
Eq WidgetHelpType |
Show WidgetHelpType |

# Methods

widgetShow :: WidgetClass self => self -> IO ()

Flags a widget to be displayed. Any widget that isn't shown will not appear on the screen. If you want to show all the widgets in a container, it's easier to call `widgetShowAll` on the container, instead of individually showing the widgets.

Remember that you have to show the containers containing a widget, in addition to the widget itself, before it will appear onscreen.

When a toplevel container is shown, it is immediately realized and mapped; other shown widgets are realized and mapped when their toplevel container is realized and mapped.

widgetShowNow :: WidgetClass self => self -> IO ()

Shows a widget. If the widget is an unmapped toplevel widget (i.e. a `Window` that has not yet been shown), enter the main loop and wait for the window to actually be mapped. Be careful; because the main loop is running, anything can happen during this function.

widgetHide :: WidgetClass self => self -> IO ()

Reverses the effects of `widgetShow`, causing the widget to be hidden (invisible to the user).

widgetShowAll :: WidgetClass self => self -> IO ()

Recursively shows a widget, and any child widgets (if the widget is a container).

widgetHideAll :: WidgetClass self => self -> IO ()

Recursively hides a widget and any child widgets.

widgetDestroy :: WidgetClass self => self -> IO ()

Destroys a widget. Equivalent to `Graphics.UI.Gtk.Abstract.Object.objectDestroy`.

When a widget is destroyed it will be removed from the screen and unrealized. When a widget is destroyed, it will break any references it holds to other objects.If the widget is inside a container, the widget will be removed from the container. The widget will be garbage collected (finalized) time after your last reference to the widget dissapears.

In most cases, only toplevel widgets (windows) require explicit destruction, because when you destroy a toplevel its children will be destroyed as well.

widgetQueueDraw :: WidgetClass self => self -> IO ()

Send a redraw request to a widget. Equivalent to calling `widgetQueueDrawArea` for the entire area of a widget.

widgetQueueResize :: WidgetClass self => self -> IO ()

This function is only for use in widget implementations. Flags a widget to have its size renegotiated; should be called when a widget for some reason has a new size request. For example, when you change the text in a `Graphics.UI.Gtk.Display.Label.Label`, `Graphics.UI.Gtk.Display.Label.Label` queues a resize to ensure there's enough space for the new text.

widgetQueueResizeNoRedraw :: WidgetClass self => self -> IO ()

This function works like `widgetQueueResize`, except that the widget is not invalidated.

- Available since Gtk+ version 2.4

widgetSizeRequest :: WidgetClass self => self -> IO Requisition

This function is typically used when implementing a `Graphics.UI.Gtk.Abstract.Container.Container` subclass. Obtains the preferred size of a widget. The container uses this information to arrange its child widgets and decide what size allocations to give them with `widgetSizeAllocate`.

You can also call this function from an application, with some caveats. Most notably, getting a size request requires the widget to be associated with a screen, because font information may be needed. Multihead-aware applications should keep this in mind.

Also remember that the size request is not necessarily the size a widget will actually be allocated.

widgetGetChildRequisition :: WidgetClass self => self -> IO Requisition

This function is only for use in widget implementations. Obtains the chached requisition information in the widget, unless someone has forced a particular geometry on the widget (e.g. with `widgetSetUsize`), in which case it returns that geometry instead of the widget's requisition.

This function differs from `widgetSizeRequest` in that it retrieves the last size request value stored in the widget, while `widgetSizeRequest` actually emits the `sizeRequest` signal on the widget to compute the size request (which updates the widget's requisition information).

Since this function does not emit the `sizeRequest` signal, it can only be used when you know that the widget's requisition is up-to-date, that is, `widgetSizeRequest` has been called since the last time a resize was queued. In general, only container implementations have this information; applications should use `widgetSizeRequest`.

widgetSizeAllocate

Arguments

:: WidgetClass self |
=> self |
-> Allocation | The `x` and `y` values of the rectangle determine the the position of the widget's area relative to its parent allocation.
-> IO () |

This function is only used by `Graphics.UI.Gtk.Abstract.Container.Container` subclasses, to assign a size and position to their child widgets.

widgetAddAccelerator

Arguments

:: WidgetClass self |
=> self |
-> String | `accelSignal` - widget signal to emit on accelerator activation
-> AccelGroup | `accelGroup` - accel group for this widget, added to its toplevel
-> KeyVal | `accelKey` - the key of the accelerator
-> [Modifier] | `accelMods` - modifier key combination of the accelerator
-> [AccelFlags] | `accelFlags` - flag accelerators, e.g. `AccelVisible`
-> IO () |

Installs an accelerator for this `widget` in `accelGroup` that causes `accelSignal` to be emitted if the accelerator is activated. The `accelGroup` needs to be added to the widget's toplevel via `windowAddAccelGroup`, and the signal must be of type `G_RUN_ACTION`. Accelerators added through this function are not user changeable during runtime. If you want to support accelerators that can be changed by the user, use `accelMapAddEntry` and `widgetSetAccelPath` or `menuItemSetAccelPath` instead.

widgetRemoveAccelerator

Arguments

:: WidgetClass self |
=> self |
-> AccelGroup | `accelGroup` - accel group for this widget
-> KeyVal | `accelKey` - the key of the accelerator
-> [Modifier] | `accelMods` - modifier key combination of the accelerator
-> IO Bool | returns whether an accelerator was installed and could be removed

Removes an accelerator from `widget`, previously installed with `widgetAddAccelerator`.

widgetSetAccelPath

Arguments

:: WidgetClass self |
=> self |
-> String | `accelPath` - path used to look up the accelerator
-> AccelGroup | `accelGroup` - a `AccelGroup`.
-> IO () |

Given an accelerator group, `accelGroup`, and an accelerator path, `accelPath`, sets up an accelerator in `accelGroup` so whenever the key binding that is defined for `accelPath` is pressed, `widget` will be activated. This removes any accelerators (for any accelerator group) installed by previous calls to `widgetSetAccelPath`. Associating accelerators with paths allows them to be modified by the user and the modifications to be saved for future use. (See `accelMapSave`.)

This function is a low level function that would most likely be used by a menu creation system like `ItemFactory`. If you use `ItemFactory`, setting up accelerator paths will be done automatically.

Even when you you aren't using `ItemFactory`, if you only want to set up accelerators on menu items `menuItemSetAccelPath` provides a somewhat more convenient interface.

widgetCanActivateAccel

Arguments

:: WidgetClass self |
=> ConnectId self | `signalId` - the ID of a signal installed on `widget`
-> IO Bool | returns `True` if the accelerator can be activated.

Determines whether an accelerator that activates the signal identified by `signalId` can currently be activated. This is done by emitting the `canActivateAccel` signal on the widget the signal is attached to; if the signal isn't overridden by a handler or in a derived widget, then the default check is that the widget must be sensitive, and the widget and all its ancestors mapped.

- Available since Gtk+ version 2.4

widgetActivate

Arguments

:: WidgetClass self |
=> self |
-> IO Bool | returns `True` if the widget was activatable

For widgets that can be "activated" (buttons, menu items, etc.) this function activates them. Activation is what happens when you press Enter on a widget during key navigation. If `widget` isn't activatable, the function returns `False`.

widgetIntersect

Arguments

:: WidgetClass self |
=> self |
-> Rectangle | `area` - a rectangle
-> IO (Maybe Rectangle) | returns the intersection or `Nothing`

Computes the intersection of a widget's area and `area`, returning the intersection, and returns `Nothing` if there was no intersection.

widgetHasIntersection

Arguments

:: WidgetClass self |
=> self |
-> Rectangle | `area` - a rectangle
-> IO Bool | returns `True` if there was an intersection

Check if the widget intersects with a given area.

widgetGetIsFocus

Arguments

:: WidgetClass self |
=> self |
-> IO Bool | returns `True` if the widget is the focus widget.

Determines if the widget is the focus widget within its toplevel. (This does not mean that the `widgetHasFocus` attribute is necessarily set; `widgetHasFocus` will only be set if the toplevel widget additionally has the global input focus.)

widgetGrabFocus :: WidgetClass self => self -> IO ()

Causes `widget` to have the keyboard focus for the `Window` it's inside. `widget` must be a focusable widget, such as a `Graphics.UI.Gtk.Entry.Entry`; something like `Graphics.UI.Gtk.Ornaments.Frame` won't work. (More precisely, it must have the `widgetCanFocus` flag set.)

widgetGrabDefault :: WidgetClass self => self -> IO ()

Causes `widget` to become the default widget. `widget` must have the `canDefault` flag set. The default widget is activated when the user presses Enter in a window. Default widgets must be activatable, that is, `widgetActivate` should affect them.

widgetSetName

Arguments

:: WidgetClass self |
=> self |
-> String | `name` - name for the widget
-> IO () |

Widgets can be named, which allows you to refer to them from a gtkrc file. You can apply a style to widgets with a particular name in the gtkrc file. See the documentation for gtkrc files.

Note that widget names are separated by periods in paths (see `widgetPath`), so names with embedded periods may cause confusion.

widgetGetName :: WidgetClass self => self -> IO String

Retrieves the name of a widget. See `widgetSetName` for the significance of widget names.

widgetSetSensitive

Arguments

:: WidgetClass self |
=> self |
-> Bool | `sensitive` - `True` to make the widget sensitive
-> IO () |

Sets the sensitivity of a widget. A widget is sensitive if the user can interact with it. Insensitive widgets are "grayed out" and the user can't interact with them. Insensitive widgets are known as "inactive", "disabled", or "ghosted" in some other toolkits.

widgetSetSensitivity :: WidgetClass self => self -> Bool -> IO ()

widgetGetParentWindow :: WidgetClass self => self -> IO DrawWindow

Gets the widget's parent window.

widgetGetDrawWindow :: WidgetClass widget => widget -> IO DrawWindow

Retrieves the `DrawWindow` that the widget draws onto.

This function thows an error if the widget has not yet been realized, since a widget does not allocate its window resources until just before it is displayed on the screen. You can use the `Graphics.UI.Gtk.Abstract.Widget.onRealize` signal to give you the opportunity to use a widget's `DrawWindow` as soon as it has been created but before the widget is displayed.

widgetDelEvents :: WidgetClass self => self -> [EventMask] -> IO ()

Disable event signals.

- Remove events from the `EventMask` of this widget. The event mask determines which events a widget will receive. Events are signals that return an `Event` data type. On connecting to a such a signal, the event mask is automatically adjusted so that he signal is emitted. This function is useful to disable the reception of the signal. It should be called whenever all signals receiving an `Event` have been disconnected.

widgetAddEvents :: WidgetClass self => self -> [EventMask] -> IO ()

Enable event signals.

- See `widgetDelEvents`.

widgetGetEvents :: WidgetClass self => self -> IO [EventMask]

Get enabled event signals.

- See `widgetDelEvents`.

widgetSetEvents

Arguments

:: WidgetClass self |
=> self |
-> [EventMask] | `events` - event mask
-> IO () |

Sets the event mask (see `EventMask`) for a widget. The event mask determines which events a widget will receive. Keep in mind that different widgets have different default event masks, and by changing the event mask you may disrupt a widget's functionality, so be careful. This function must be called while a widget is unrealized. Consider `widgetAddEvents` for widgets that are already realized, or if you want to preserve the existing event mask. This function can't be used with `NoWindow` widgets; to get events on those widgets, place them inside a `Graphics.UI.Gtk.Misc.EventBox` and receive events on the event box.

widgetSetExtensionEvents :: WidgetClass self => self -> [ExtensionMode] -> IO ()

Sets the extension events mask to `mode`. See `ExtensionMode` and `inputSetExtensionEvents`.

widgetGetExtensionEvents :: WidgetClass self => self -> IO [ExtensionMode]

Retrieves the extension events the widget will receive; see `widgetSetExtensionEvents`.

widgetGetToplevel

Arguments

:: WidgetClass self |
=> self | `widget` - the widget in question
-> IO Widget | returns the topmost ancestor of `widget`, or `widget` itself if there's no ancestor.

This function returns the topmost widget in the container hierarchy `widget` is a part of. If `widget` has no parent widgets, it will be returned as the topmost widget.

widgetGetAncestor

Arguments

:: WidgetClass self |
=> self |
-> GType | `widgetType` - ancestor type
-> IO (Maybe Widget) | returns the ancestor widget, or `Nothing` if not found

Gets the first ancestor of `widget` with type `widgetType`. For example, `widgetGetAncestor widget gTypeBox` gets the first `Box` that's an ancestor of `widget`. See note about checking for a toplevel `Window` in the docs for `widgetGetToplevel`.

Note that unlike `widgetIsAncestor`, `widgetGetAncestor` considers `widget` to be an ancestor of itself.

widgetGetColormap

Arguments

:: WidgetClass self |
=> self |
-> IO Colormap | returns the colormap used by `widget`

Gets the colormap that will be used to render `widget`.

widgetSetColormap

Arguments

:: WidgetClass self |
=> self |
-> Colormap | `colormap` - a colormap
-> IO () |

Sets the colormap for the widget to the given value. Widget must not have been previously realized. This probably should only be used from an `init` function (i.e. from the constructor for the widget).

widgetGetPointer

Arguments

:: WidgetClass self |
=> self |
-> IO (Int, Int) | `(x, y)` - X Y coordinate

Obtains the location of the mouse pointer in widget coordinates. Widget coordinates are a bit odd; for historical reasons, they are defined as `widgetGetParentWindow` coordinates for widgets that are not `NoWindow` widgets, and are relative to the widget's allocation's (x,y) for widgets that are `NoWindow` widgets.

widgetIsAncestor

Arguments

:: (WidgetClass self, WidgetClass ancestor) |
=> self | `widget` - the widget in question
-> ancestor | `ancestor` - another `Widget`
-> IO Bool | returns `True` if `ancestor` contains `widget` as a child, grandchild, great grandchild, etc.

Determines whether `widget` is somewhere inside `ancestor`, possibly with intermediate containers.

widgetTranslateCoordinates

Arguments

:: (WidgetClass self, WidgetClass destWidget) |
=> self | `srcWidget` - a `Widget`
-> destWidget | `destWidget` - a `Widget`
-> Int | `srcX` - X position relative to `srcWidget`
-> Int | `srcY` - Y position relative to `srcWidget`
-> IO (Maybe (Int, Int)) | `Just (destX, destY)` - X and Y position relative to `destWidget`. Returns `Nothing` if either widget was not realized, or there was no common ancestor.

Translate coordinates relative to `srcWidget`'s allocation to coordinates relative to `destWidget`'s allocations. In order to perform this operation, both widgets must be realized, and must share a common toplevel.

widgetSetStyle

Arguments

:: WidgetClass self |
=> self |
-> Maybe Style | `style` - a `Style`, or `Nothing` to remove the effect of a previous `widgetSetStyle` and go back to the default style
-> IO () |

Sets the `Style` for a widget. You probably don't want to use this function; it interacts badly with themes, because themes work by replacing the `Style`. Instead, use `widgetModifyStyle`.

widgetGetStyle :: WidgetClass widget => widget -> IO Style

Retrieve the `Style` associated with the widget.

widgetPushColormap

Arguments

:: Colormap | `cmap` - a `Colormap`
-> IO () |

Pushes `cmap` onto a global stack of colormaps; the topmost colormap on the stack will be used to create all widgets. Remove `cmap` with `widgetPopColormap`. There's little reason to use this function.

widgetPopColormap :: IO ()

Removes a colormap pushed with `widgetPushColormap`.

widgetSetDefaultColormap

Arguments

:: Colormap | `colormap` - a `Colormap`
-> IO () |

Sets the default colormap to use when creating widgets. `widgetPushColormap` is a better function to use if you only want to affect a few widgets, rather than all widgets.

widgetGetDefaultStyle

Arguments

:: IO Style | returns the default style. This `Style` object is owned by Gtk and should not be modified.

Returns the default style used by all widgets initially.

widgetGetDefaultColormap

Arguments

:: IO Colormap | returns default widget colormap

Obtains the default colormap used to create widgets.

widgetSetDirection :: WidgetClass self => self -> TextDirection -> IO ()

Sets the reading direction on a particular widget. This direction controls the primary direction for widgets containing text, and also the direction in which the children of a container are packed. The ability to set the direction is present in order so that correct localization into languages with right-to-left reading directions can be done. Generally, applications will let the default reading direction present, except for containers where the containers are arranged in an order that is explicitely visual rather than logical (such as buttons for text justification).

If the direction is set to `TextDirNone`, then the value set by `widgetSetDefaultDirection` will be used.

widgetGetDirection :: WidgetClass self => self -> IO TextDirection

Gets the reading direction for a particular widget. See `widgetSetDirection`.

widgetSetDefaultDirection

Arguments

:: TextDirection | `dir` - the new default direction. This cannot be `TextDirNone`.
-> IO () |

Sets the default reading direction for widgets where the direction has not been explicitly set by `widgetSetDirection`.

widgetGetDefaultDirection :: IO TextDirection

Obtains the current default reading direction. See `widgetSetDefaultDirection`.

widgetShapeCombineMask

Arguments

:: WidgetClass self |
=> self |
-> Maybe Bitmap | `shapeMask` - shape to be added, or `Nothint` to remove an existing shape.
-> Int | `offsetX` - X position of shape mask with respect to `window`.
-> Int | `offsetY` - Y position of shape mask with respect to `window`.
-> IO () |

Sets a shape for this widget's `DrawWindow`. This allows for transparent windows etc., see `windowShapeCombineMask` for more information.

widgetInputShapeCombineMask

Arguments

:: WidgetClass self |
=> self |
-> Maybe Bitmap | `shapeMask` - shape to be added, or `Nothint` to remove an existing shape.
-> Int | `offsetX` - X position of shape mask with respect to `window`.
-> Int | `offsetY` - Y position of shape mask with respect to `window`.
-> IO () |

Sets an input shape for this widget's GDK window. This allows for windows which react to mouse click in a nonrectangular region, see `windowInputShapeCombineMask` for more information.

- Available since Gtk+ version 2.10

widgetGetTooltipWindow

Arguments

:: WidgetClass self |
=> self |
-> IO Window | returns The `Window` of the current tooltip

Returns the `Window` of the current tooltip. This can be the `Window` created by default, or the custom tooltip window set using `widgetSetTooltipWindow`.

- Available since Gtk+ version 2.12

widgetSetTooltipWindow

Arguments

:: (WidgetClass self, WindowClass customWindow) |
=> self |
-> Maybe customWindow | `customWindow` a `Window`, or `Nothing`. allow-none.
-> IO () |

Replaces the default, usually yellow, window used for displaying tooltips with `customWindow`. GTK+ will take care of showing and hiding `customWindow` at the right moment, to behave likewise as the default tooltip window. If `customWindow` is `Nothing`, the default tooltip window will be used.

If the custom window should have the default theming it needs to have the name 'gtk-tooltip', see `widgetSetName`.

- Available since Gtk+ version 2.12

widgetTriggerTooltipQuery :: WidgetClass self => self -> IO ()

Triggers a tooltip query on the display where the toplevel of `widget` is located. See `tooltipTriggerTooltipQuery` for more information.

- Available since Gtk+ version 2.12

widgetGetSnapshot

Arguments

:: WidgetClass self |
=> self |
-> Rectangle |
-> IO (Maybe Pixmap) | returns `Pixmap` snapshot of the widget

Create a `Pixmap` of the contents of the widget and its children.

Works even if the widget is obscured. The depth and visual of the resulting pixmap is dependent on the widget being snapshot and likely differs from those of a target widget displaying the pixmap. The function `pixbufGetFromDrawable` can be used to convert the pixmap to a visual independant representation.

The snapshot area used by this function is the widget's allocation plus any extra space occupied by additional windows belonging to this widget (such as the arrows of a spin button). Thus, the resulting snapshot pixmap is possibly larger than the allocation.

The resulting pixmap is shrunken to match the specified `clipRect`. The (x,y) coordinates of `clipRect` are interpreted widget relative. If width or height of `clipRect` are 0 or negative, the width or height of the resulting pixmap will be shrunken by the respective amount. For instance a `clipRect` { +5, +5, -10, -10 } will chop off 5 pixels at each side of the snapshot pixmap. `clipRect` will contain the exact widget-relative snapshot coordinates upon return. A `clipRect` of { -1, -1, 0, 0 } can be used to preserve the auto-grown snapshot area and use `clipRect` as a pure output parameter.

The returned pixmap can be `Nothing`, if the resulting `clipArea` was empty.

widgetPath

Arguments

:: WidgetClass self |
=> self |
-> IO (Int, String, String) | `(pathLength, path, pathReversed)` - length of the path, path string and reverse path string

Obtains the full path to `widget`. The path is simply the name of a widget and all its parents in the container hierarchy, separated by periods. The name of a widget comes from `widgetGetName`. Paths are used to apply styles to a widget in gtkrc configuration files. Widget names are the type of the widget by default (e.g. "GtkButton") or can be set to an application-specific value with `widgetSetName`. By setting the name of a widget, you allow users or theme authors to apply styles to that specific widget in their gtkrc file. Also returns the path in reverse order, i.e. starting with the widget's name instead of starting with the name of the widget's outermost ancestor.

widgetClassPath

Arguments

:: WidgetClass self |
=> self |
-> IO (Int, String, String) | `(pathLength, path, pathReversed)` - length of the path, path string and reverse path string

Same as `widgetPath`, but always uses the name of a widget's type, never uses a custom name set with `widgetSetName`.

widgetGetCompositeName

Arguments

:: WidgetClass self |
=> self |
-> IO (Maybe String) | returns the composite name of `widget`, or `Nothing` if `widget` is not a composite child.

Obtains the composite name of a widget.

widgetModifyStyle

Arguments

:: (WidgetClass self, RcStyleClass style) |
=> self |
-> style | `style` - the `RcStyle` holding the style modifications
-> IO () |

Modifies style values on the widget. Modifications made using this technique take precedence over style values set via an RC file, however, they will be overriden if a style is explicitely set on the widget using `widgetSetStyle`. The `RcStyle` structure is designed so each field can either be set or unset, so it is possible, using this function, to modify some style values and leave the others unchanged.

Note that modifications made with this function are not cumulative with previous calls to `widgetModifyStyle` or with such functions as `widgetModifyFg`. If you wish to retain previous values, you must first call `widgetGetModifierStyle`, make your modifications to the returned style, then call `widgetModifyStyle` with that style. On the other hand, if you first call `widgetModifyStyle`, subsequent calls to such functions `widgetModifyFg` will have a cumulative effect with the initial modifications.

widgetGetModifierStyle :: WidgetClass self => self -> IO RcStyle

Returns the current modifier style for the widget. (As set by `widgetModifyStyle`.) If no style has previously set, a new `RcStyle` will be created with all values unset, and set as the modifier style for the widget. If you make changes to this rc style, you must call `widgetModifyStyle`, passing in the returned rc style, to make sure that your changes take effect.

Caution: passing the style back to `widgetModifyStyle` will normally end up destroying it, because `widgetModifyStyle` copies the passed-in style and sets the copy as the new modifier style, thus dropping any reference to the old modifier style. Add a reference to the modifier style if you want to keep it alive.

widgetModifyFg

Arguments

:: WidgetClass self |
=> self |
-> StateType | `state` - the state for which to set the foreground color.
-> Color | `color` - the color to assign (does not need to be allocated), or `Nothing` to undo the effect of previous calls to of `widgetModifyFg`.
-> IO () |

Sets the foreground color for a widget in a particular state. All other style values are left untouched. See also `widgetModifyStyle`.

widgetModifyBg

Arguments

:: WidgetClass self |
=> self |
-> StateType | `state` - the state for which to set the background color.
-> Color | `color` - the color to assign (does not need to be allocated), or `Nothing` to undo the effect of previous calls to of `widgetModifyBg`.
-> IO () |

Sets the background color for a widget in a particular state. All other style values are left untouched. See also `widgetModifyStyle`.

Note that "no window" widgets (which have the `NoWindow` flag set) draw on their parent container's window and thus may not draw any background themselves. This is the case for e.g. `Label`. To modify the background of such widgets, you have to set the background color on their parent; if you want to set the background of a rectangular area around a label, try placing the label in a `EventBox` widget and setting the background color on that.

widgetModifyText

Arguments

:: WidgetClass self |
=> self |
-> StateType | `state` - the state for which to set the text color.
-> Color | `color` - the color to assign (does not need to be allocated), or `Nothing` to undo the effect of previous calls to of `widgetModifyText`.
-> IO () |

Sets the text color for a widget in a particular state. All other style values are left untouched. The text color is the foreground color used along with the base color (see `widgetModifyBase`) for widgets such as `Entry` and `TextView`. See also `widgetModifyStyle`.

widgetModifyBase

Arguments

:: WidgetClass self |
=> self |
-> StateType | `state` - the state for which to set the base color.
-> Color | `color` - the color to assign (does not need to be allocated), or `Nothing` to undo the effect of previous calls to of `widgetModifyBase`.
-> IO () |

Sets the base color for a widget in a particular state. All other style values are left untouched. The base color is the background color used along with the text color (see `widgetModifyText`) for widgets such as `Entry` and `TextView`. See also `widgetModifyStyle`.

Note that "no window" widgets (which have the `NoWindow` flag set) draw on their parent container's window and thus may not draw any background themselves. This is the case for e.g. `Label`. To modify the background of such widgets, you have to set the base color on their parent; if you want to set the background of a rectangular area around a label, try placing the label in a `EventBox` widget and setting the base color on that.

widgetModifyFont

Arguments

:: WidgetClass self |
=> self |
-> Maybe FontDescription | `fontDesc` - the font description to use, or `Nothing` to undo the effect of previous calls to `widgetModifyFont`.
-> IO () |

Sets the font to use for a widget. All other style values are left untouched. See also `widgetModifyStyle`.

widgetCreatePangoContext

Arguments

:: WidgetClass self |
=> self |
-> IO PangoContext | returns the new `PangoContext`

Creates a new `PangoContext` with the appropriate colormap, font description, and base direction for drawing text for this widget. See also `widgetGetPangoContext`.

widgetGetPangoContext

Arguments

:: WidgetClass self |
=> self |
-> IO PangoContext | returns the `PangoContext` for the widget.

Gets a `PangoContext` with the appropriate font description and base direction for this widget. Unlike the context returned by `widgetCreatePangoContext`, this context is owned by the widget (it can be used until the screen for the widget changes or the widget is removed from its toplevel), and will be updated to match any changes to the widget's attributes.

If you create and keep a `PangoLayout` using this context, you must deal with changes to the context by calling `layoutContextChanged` on the layout in response to the `onStyleChanged` and `onDirectionChanged` signals for the widget.

widgetCreateLayout

Arguments

:: WidgetClass self |
=> self |
-> String | `text` - text to set on the layout
-> IO PangoLayout |

Prepare text for display.

The `PangoLayout` represents the rendered text. It can be shown on screen by calling `drawLayout`.

The returned `PangoLayout` shares the same font information (`PangoContext`) as this widget. If this information changes, the `PangoLayout` should change. The following code ensures that the displayed text always reflects the widget's settings:

     l <- widgetCreateLayout w "My Text."
     let update = do
     layoutContextChanged l
     -- update the Drawables which show this layout
     w `onDirectionChanged` update
     w `onStyleChanged` update

widgetRenderIcon

Arguments

:: WidgetClass self |
=> self |
-> String | `stockId` - a stock ID
-> IconSize | `size` - a stock size
-> String | `detail` - render detail to pass to theme engine
-> IO (Maybe Pixbuf) | returns a new pixbuf, or `Nothing` if the stock ID wasn't known

A convenience function that uses the theme engine and RC file settings for `widget` to look up the stock icon and render it to a `Graphics.UI.Gtk.Gdk.Pixbuf.Pixbuf`. The icon should be one of the stock id constants such as `Graphics.UI.Gtk.General.StockItems.stockOpen`. `size` should be a size such as `Graphics.UI.Gtk.General.IconFactory.IconSizeMenu`. `detail` should be a string that identifies the widget or code doing the rendering, so that theme engines can special-case rendering for that widget or code.

The pixels in the returned `Graphics.UI.Gtk.Gdk.Pixbuf.Pixbuf` are shared with the rest of the application and should not be modified.

widgetQueueDrawArea

Arguments

:: WidgetClass self |
=> self |
-> Int | `x` - x coordinate of upper-left corner of rectangle to redraw
-> Int | `y` - y coordinate of upper-left corner of rectangle to redraw
-> Int | `width` - width of region to draw
-> Int | `height` - height of region to draw
-> IO () |

Invalidates the rectangular area of `widget` defined by `x`, `y`, `width` and `height` by calling `Graphics.UI.Gtk.Gdk.DrawWindow.drawWindowInvalidateRect` on the widget's `Graphics.UI.Gtk.Gdk.DrawWindow.DrawWindow` and all its child windows. Once the main loop becomes idle (after the current batch of events has been processed, roughly), the window will receive expose events for the union of all regions that have been invalidated.

Normally you would only use this function in widget implementations. In particular, you might use it, or `Graphics.UI.Gtk.Gdk.DrawWindow.drawWindowInvalidateRect` directly, to schedule a redraw of a `Graphics.UI.Gtk.Gdk.DrawWindow.DrawingArea` or some portion thereof.

Frequently you can just call `Graphics.UI.Gtk.Gdk.DrawWindow.windowInvalidateRect` or `Graphics.UI.Gtk.Gdk.DrawWindow.windowInvalidateRegion` instead of this function. Those functions will invalidate only a single window, instead of the widget and all its children.

The advantage of adding to the invalidated region compared to simply drawing immediately is efficiency; using an invalid region ensures that you only have to redraw one time.

widgetResetShapes :: WidgetClass self => self -> IO ()

Recursively resets the shape on this widget and its descendants.

widgetSetAppPaintable

Arguments

:: WidgetClass self |
=> self |
-> Bool | `appPaintable` - `True` if the application will paint on the widget
-> IO () |

Sets whether the application intends to draw on the widget in response to an `onExpose` signal.

- This is a hint to the widget and does not affect the behavior of the GTK+ core; many widgets ignore this flag entirely. For widgets that do pay attention to the flag, such as `EventBox` and `Window`, the effect is to suppress default themed drawing of the widget's background. (Children of the widget will still be drawn.) The application is then entirely responsible for drawing the widget background.

widgetSetDoubleBuffered

Arguments

:: WidgetClass self |
=> self |
-> Bool | `doubleBuffered` - `True` to double-buffer a widget
-> IO () |

Widgets are double buffered by default; you can use this function to turn off the buffering. "Double buffered" simply means that `Graphics.UI.Gtk.Gdk.DrawWindow.drawWindowBeginPaintRegion` and `Graphics.UI.Gtk.Gdk.DrawWindow.drawWindowEndPaint` are called automatically around expose events sent to the widget. `Graphics.UI.Gtk.Gdk.DrawWindow.drawWindowBeginPaintRegion` diverts all drawing to a widget's window to an offscreen buffer, and `Graphics.UI.Gtk.Gdk.DrawWindow.drawWindowEndPaint` draws the buffer to the screen. The result is that users see the window update in one smooth step, and don't see individual graphics primitives being rendered.

In very simple terms, double buffered widgets don't flicker, so you would only use this function to turn off double buffering if you had special needs and really knew what you were doing.

Note: if you turn off double-buffering, you have to handle expose events, since even the clearing to the background color or pixmap will not happen automatically (as it is done in `Graphics.UI.Gtk.Gdk.DrawWindow.drawWindowBeginPaint`).

widgetSetRedrawOnAllocate

Arguments

:: WidgetClass self |
=> self |
-> Bool | `redrawOnAllocate` - if `True`, the entire widget will be redrawn when it is allocated to a new size. Otherwise, only the new portion of the widget will be redrawn.
-> IO () |

Sets whether the entire widget is queued for drawing when its size allocation changes. By default, this setting is `True` and the entire widget is redrawn on every size change. If your widget leaves the upper left unchanged when made bigger, turning this setting on will improve performance.

Note that for "no window" widgets setting this flag to `False` turns off all allocation on resizing: the widget will not even redraw if its position changes; this is to allow containers that don't draw anything to avoid excess invalidations. If you set this flag on a "no window" widget that does draw its window, you are responsible for invalidating both the old and new allocation of the widget when the widget is moved and responsible for invalidating regions newly when the widget increases size.

widgetSetCompositeName

Arguments

:: WidgetClass self |
=> self |
-> String | `name` - the name to set.
-> IO () |

Sets a widgets composite name. A child widget of a container is composite if it serves as an internal widget and, thus, is not added by the user.

widgetSetScrollAdjustments

Arguments

:: WidgetClass self |
=> self |
-> Maybe Adjustment | `hadjustment` - an adjustment for horizontal scrolling, or `Nothing`
-> Maybe Adjustment | `vadjustment` - an adjustment for vertical scrolling, or `Nothing`
-> IO Bool | returns `True` if the widget supports scrolling

For widgets that support scrolling, sets the scroll adjustments and returns `True`. For widgets that don't support scrolling, does nothing and returns `False`. Widgets that don't support scrolling can be scrolled by placing them in a `Viewport`, which does support scrolling.

widgetRegionIntersect

Arguments

:: WidgetClass self |
=> self |
-> Region | `region` - a `Region` in the same coordinate system as the widget's allocation. That is, relative to the widget's `DrawWindow` for `NoWindow` widgets; relative to the parent `DrawWindow` of the widget's `DrawWindow` for widgets with their own `DrawWindow`.
-> IO Region | returns A region holding the intersection of the widget and `region`. The coordinates of the return value are relative to the widget's `DrawWindow`, if it has one, otherwise it is relative to the parent's `DrawWindow`.

Computes the intersection of a widget's area and `region`, returning the intersection. The result may be empty, use `Graphics.UI.Gtk.Gdk.Region.regionEmpty` to check.

widgetGetAccessible

Arguments

:: WidgetClass self |
=> self |
-> IO Object | returns the `Object` associated with `widget`

Returns the accessible object that describes the widget to an assistive technology.

If no accessibility library is loaded (i.e. no ATK implementation library is loaded via GTK_MODULES or via another application library, such as libgnome), then this `Object` instance may be a no-op. Likewise, if no class-specific `Object` implementation is available for the widget instance in question, it will inherit an `Object` implementation from the first ancestor class for which such an implementation is defined.

The documentation of the ATK library contains more information about accessible objects and their uses.

widgetChildFocus

Arguments

:: WidgetClass self |
=> self |
-> DirectionType | `direction` - direction of focus movement
-> IO Bool | returns `True` if focus ended up inside `widget`

This function is used by custom widget implementations; if you're writing an app, you'd use `widgetGrabFocus` to move the focus to a particular widget, and `containerSetFocusChain` to change the focus tab order. So you may want to investigate those functions instead.

The "focus" default handler for a widget should return `True` if moving in `direction` left the focus on a focusable location inside that widget, and `False` if moving in `direction` moved the focus outside the widget. If returning `True`, widgets normally call `widgetGrabFocus` to place the focus accordingly; if returning `False`, they don't modify the current focus location.

widgetGetChildVisible

Arguments

:: WidgetClass self |
=> self |
-> IO Bool | returns `True` if the widget is mapped with the parent.

Gets the value set with `widgetSetChildVisible`. If you feel a need to use this function, your code probably needs reorganization.

This function is only useful for container implementations and never should be called by an application.

widgetGetParent :: WidgetClass self => self -> IO (Maybe Widget)

Returns the parent container of `widget`.

- Returns the parent container of `widget` if it has one.

widgetGetSettings

Arguments

:: WidgetClass self |
=> self |
-> IO Settings | returns the relevant `Settings` object

Gets the settings object holding the settings (global property settings, RC file information, etc) used for this widget.

Note that this function can only be called when the `Widget` is attached to a toplevel, since the settings object is specific to a particular `Screen`.

widgetGetClipboard

Arguments

:: WidgetClass self |
=> self |
-> SelectionTag | `selection` a `Atom` which identifies the clipboard to use. `selectionClipboard` gives the default clipboard. Another common value is `selectionPrimary`, which gives the primary X selection.
-> IO Clipboard | returns the appropriate clipboard object. If no clipboard already exists, a new one will be created.

Returns the clipboard object for the given selection to be used with widget. widget must have a `Display` associated with it, so must be attached to a toplevel window.

widgetGetDisplay

Arguments

:: WidgetClass self |
=> self |
-> IO Display | returns the `Display` for the toplevel for this widget.

Get the `Display` for the toplevel window associated with this widget. This function can only be called after the widget has been added to a widget hierarchy with a `Window` at the top.

In general, you should only create display specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.

- Available since Gtk+ version 2.2

widgetGetRootWindow

Arguments

:: WidgetClass self |
=> self |
-> IO DrawWindow | returns the `DrawWindow` root window for the toplevel for this widget.

Get the root window where this widget is located. This function can only be called after the widget has been added to a widget heirarchy with `Window` at the top.

The root window is useful for such purposes as creating a popup `DrawWindow` associated with the window. In general, you should only create display specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.

- Available since Gtk+ version 2.2

widgetGetScreen

Arguments

:: WidgetClass self |
=> self |
-> IO Screen | returns the `Screen` for the toplevel for this widget.

Get the `Screen` from the toplevel window associated with this widget. This function can only be called after the widget has been added to a widget hierarchy with a `Window` at the top.

In general, you should only create screen specific resources when a widget has been realized, and you should free those resources when the widget is unrealized.

- Available since Gtk+ version 2.2

widgetHasScreen

Arguments

:: WidgetClass self |
=> self |
-> IO Bool | returns `True` if there is a `Screen` associcated with the widget.

Checks whether there is a `Screen` is associated with this widget. All toplevel widgets have an associated screen, and all widgets added into a heirarchy with a toplevel window at the top.

- Available since Gtk+ version 2.2

widgetGetSizeRequest

Arguments

:: WidgetClass self |
=> self |
-> IO (Int, Int) |
    (width, height)

Gets the size request that was explicitly set for the widget using `widgetSetSizeRequest`. A value of -1 for `width` or `height` indicates that that dimension has not been set explicitly and the natural requisition of the widget will be used intead. See `widgetSetSizeRequest`. To get the size a widget will actually use, call `widgetSizeRequest` instead of this function.

widgetSetChildVisible

Arguments

:: WidgetClass self |
=> self |
-> Bool | `isVisible` - if `True`, `widget` should be mapped along with its parent.
-> IO () |

Sets whether `widget` should be mapped along with its when its parent is mapped and `widget` has been shown with `widgetShow`.

The child visibility can be set for widget before it is added to a container with `widgetSetParent`, to avoid mapping children unnecessary before immediately unmapping them. However it will be reset to its default state of `True` when the widget is removed from a container.

Note that changing the child visibility of a widget does not queue a resize on the widget. Most of the time, the size of a widget is computed from all visible children, whether or not they are mapped. If this is not the case, the container can queue a resize itself.

This function is only useful for container implementations and never should be called by an application.

widgetSetSizeRequest

Arguments

:: WidgetClass self |
=> self |
-> Int | `width` - width `widget` should request, or -1 to unset
-> Int | `height` - height `widget` should request, or -1 to unset
-> IO () |

Sets the minimum size of a widget; that is, the widget's size request will be `width` by `height`. You can use this function to force a widget to be either larger or smaller than it normally would be.

In most cases, `Graphics.UI.Gtk.Windows.Window.windowSetDefaultSize` is a better choice for toplevel windows than this function; setting the default size will still allow users to shrink the window. Setting the size request will force them to leave the window at least as large as the size request. When dealing with window sizes, `Graphics.UI.Gtk.Windows.Window.windowSetGeometryHints` can be a useful function as well.

Note the inherent danger of setting any fixed size - themes, translations into other languages, different fonts, and user action can all change the appropriate size for a given widget. So, it's basically impossible to hardcode a size that will always be correct.

The size request of a widget is the smallest size a widget can accept while still functioning well and drawing itself correctly. However in some strange cases a widget may be allocated less than its requested size, and in many cases a widget may be allocated more space than it requested.

If the size request in a given direction is -1 (unset), then the "natural" size request of the widget will be used instead.

Widgets can't actually be allocated a size less than 1 by 1, but you can pass 0,0 to this function to mean "as small as possible."

widgetSetNoShowAll

Arguments

:: WidgetClass self |
=> self |
-> Bool | `noShowAll` - the new value for the `noShowAll` property
-> IO () |

Sets the `noShowAll` property, which determines whether calls to `widgetShowAll` and `widgetHideAll` will affect this widget.

This is mostly for use in constructing widget hierarchies with externally controlled visibility, see `UIManager`.

- Available since Gtk+ version 2.4

widgetGetNoShowAll

Arguments

:: WidgetClass self |
=> self |
-> IO Bool | returns the current value of the "no_show_all" property.

Returns the current value of the `noShowAll` property, which determines whether calls to `widgetShowAll` and `widgetHideAll` will affect this widget.

- Available since Gtk+ version 2.4

widgetListMnemonicLabels

Arguments

:: WidgetClass self |
=> self |
-> IO [Widget] | returns the list of mnemonic labels

Returns a list of the widgets, normally labels, for which this widget is a the target of a mnemonic (see for example, `labelSetMnemonicWidget`).

- Available since Gtk+ version 2.4

widgetAddMnemonicLabel

Arguments

:: (WidgetClass self, WidgetClass label) |
=> self |
-> label | `label` - a `Widget` that acts as a mnemonic label for `widget`.
-> IO () |

Adds a widget to the list of mnemonic labels for this widget. (See `widgetListMnemonicLabels`). Note the list of mnemonic labels for the widget is cleared when the widget is destroyed, so the caller must make sure to update its internal state at this point as well, by using a connection to the `destroy` signal or a weak notifier.

- Available since Gtk+ version 2.4

widgetRemoveMnemonicLabel

Arguments

:: (WidgetClass self, WidgetClass label) |
=> self |
-> label | `label` - a `Widget` that was previously set as a mnemnic label for `widget` with `widgetAddMnemonicLabel`.
-> IO () |

Removes a widget from the list of mnemonic labels for this widget. (See `widgetListMnemonicLabels`). The widget must have previously been added to the list with `widgetAddMnemonicLabel`.

- Available since Gtk+ version 2.4

widgetGetAction

Arguments

:: WidgetClass self |
=> self |
-> IO (Maybe Action) | returns the action that a widget is a proxy for, or `Nothing`, if it is not attached to an action.

Returns the `Action` that `widget` is a proxy for. See also `actionGetProxies`.

- Available since Gtk+ version 2.10

widgetIsComposited

Arguments

:: WidgetClass self |
=> self |
-> IO Bool | returns `True` if the widget can rely on its alpha channel being drawn correctly.

Whether `widget` can rely on having its alpha channel drawn correctly. On X11 this function returns whether a compositing manager is running for `widget`'s screen

- Available since Gtk+ version 2.10

widgetReparent

Arguments

:: (WidgetClass self, WidgetClass newParent) |
=> self |
-> newParent | `newParent` - a `Container` to move the widget into
-> IO () |

Moves a widget from one `Container` to another.

widgetGetCanFocus :: WidgetClass self => self -> IO Bool

Check if this widget can receive keyboard input.

widgetSetCanFocus :: WidgetClass self => self -> Bool -> IO ()

Set if this widget can receive keyboard input.

- To use the `keyPress` event, the widget must be allowed to get the input focus. Once it has the input focus all keyboard input is directed to this widget.

widgetGetAllocation :: WidgetClass self => self -> IO Allocation

Retrieves the widget's allocation.

- Available since Gtk+ version 2.18

widgetGetState :: WidgetClass self => self -> IO StateType

Retrieve the current state of the widget.

- The state refers to different modes of user interaction, see `StateType` for more information.

widgetSetState :: WidgetClass self => self -> StateType -> IO ()

This function is for use in widget implementations. Sets the state of a widget (insensitive, prelighted, etc.) Usually you should set the state using wrapper functions such as `widgetSetSensitive`.

widgetGetSavedState :: WidgetClass w => w -> IO StateType

Retrieve the current state of the widget.

- If a widget is turned insensitive, the previous state is stored in a specific location. This function retrieves this previous state.

widgetGetSize :: WidgetClass widget => widget -> IO (Int, Int)

Returns the current size.

- This information may be out of date if the user is resizing the window.

widgetEvent :: WidgetClass self => self -> EventM t Bool

Rarely-used function. This function is used to emit the event signals on a widget (those signals should never be emitted without using this function to do so). If you want to synthesize an event though, don't use this function; instead, use `mainDoEvent` so the event will behave as if it were in the event queue. Don't synthesize expose events; instead, use `windowInvalidateRect` to invalidate a region of the window.

# Attributes

widgetName :: WidgetClass self => Attr self (Maybe String)

The name of the widget.

Default value: `Nothing`

widgetParent :: (WidgetClass self, ContainerClass container) => ReadWriteAttr self (Maybe Container) (Maybe container)

The parent widget of this widget. Must be a Container widget.

widgetWidthRequest :: WidgetClass self => Attr self Int

Override for width request of the widget, or -1 if natural request should be used.

Allowed values: >= -1

Default value: -1

widgetHeightRequest :: WidgetClass self => Attr self Int

Override for height request of the widget, or -1 if natural request should be used.

Allowed values: >= -1

Default value: -1

widgetVisible :: WidgetClass self => Attr self Bool

Whether the widget is visible.

Default value: `False`

widgetSensitive :: WidgetClass self => Attr self Bool

Whether the widget responds to input.

Default value: `True`

widgetAppPaintable :: WidgetClass self => Attr self Bool

Whether the application will paint directly on the widget.

Default value: `False`

widgetCanFocus :: WidgetClass self => Attr self Bool

Whether the widget can accept the input focus.

Default value: `False`

widgetHasFocus :: WidgetClass self => Attr self Bool

Whether the widget has the input focus.

Default value: `False`

widgetIsFocus :: WidgetClass self => Attr self Bool

Whether the widget is the focus widget within the toplevel.

Default value: `False`

widgetCanDefault :: WidgetClass self => Attr self Bool

Whether the widget can be the default widget.

Default value: `False`

widgetHasDefault :: WidgetClass self => Attr self Bool

Whether the widget is the default widget.

Default value: `False`

widgetReceivesDefault :: WidgetClass self => Attr self Bool

If `True`, the widget will receive the default action when it is focused.

Default value: `False`

widgetCompositeChild :: WidgetClass self => ReadAttr self Bool

Whether the widget is part of a composite widget.

Default value: `False`

widgetStyle :: WidgetClass self => Attr self Style

The style of the widget, which contains information about how it will look (colors etc).

widgetState :: WidgetClass self => Attr self StateType

The current visual user interaction state of the widget (insensitive, prelighted, selected etc). See `StateType` for more information.

widgetEvents :: WidgetClass self => Attr self [EventMask]

The event mask that decides what kind of GdkEvents this widget gets.

Default value: `StructureMask`

widgetExtensionEvents :: WidgetClass self => Attr self [ExtensionMode]

The mask that decides what kind of extension events this widget gets.

Default value: `ExtensionEventsNone`

widgetNoShowAll :: WidgetClass self => Attr self Bool

Whether `widgetShowAll` should not affect this widget.

Default value: `False`

widgetChildVisible :: WidgetClass self => Attr self Bool

'childVisible' property. See `widgetGetChildVisible` and `widgetSetChildVisible`

widgetColormap :: WidgetClass self => Attr self Colormap

'colormap' property. See `widgetGetColormap` and `widgetSetColormap`

widgetCompositeName :: WidgetClass self => ReadWriteAttr self (Maybe String) String

'compositeName' property. See `widgetGetCompositeName` and `widgetSetCompositeName`

widgetDirection :: WidgetClass self => Attr self TextDirection

'direction' property. See `widgetGetDirection` and `widgetSetDirection`

widgetTooltipMarkup :: WidgetClass self => Attr self (Maybe Markup)

Sets the text of tooltip to be the given string, which is marked up with the Pango text markup language. Also see `tooltipSetMarkup`.

This is a convenience property which will take care of getting the tooltip shown if the given string is not "": `hasTooltip` will automatically be set to `True` and there will be taken care of `queryTooltip` in the default signal handler.

Default value: ""

- Available since Gtk+ version 2.12

widgetTooltipText :: WidgetClass self => Attr self (Maybe String)

Sets the text of tooltip to be the given string.

Also see `tooltipSetText`.

This is a convenience property which will take care of getting the tooltip shown if the given string is not "": `hasTooltip` will automatically be set to `True` and there will be taken care of `queryTooltip` in the default signal handler.

Default value: ""

- Available since Gtk+ version 2.12

widgetHasTooltip :: WidgetClass self => Attr self Bool

Enables or disables the emission of `queryTooltip` on widget. A value of `True` indicates that widget can have a tooltip, in this case the widget will be queried using `queryTooltip` to determine whether it will provide a tooltip or not.

Note that setting this property to `True` for the first time will change the event masks of the `Windows` of this widget to include leave-notify and motion-notify events. This cannot and will not be undone when the property is set to `False` again.

Default value: `False`

- Available since Gtk+ version 2.12

widgetHasRcStyle

Arguments

:: WidgetClass self |
=> self |
-> IO Bool | returns `True` if the widget has been looked up through the rc mechanism, `False` otherwise.

Determines if the widget style has been looked up through the rc mechanism.

widgetGetRealized

Arguments

:: WidgetClass self |
=> self |
-> IO Bool | returns `True` if widget is realized, `False` otherwise

Determines whether widget is realized.

widgetGetMapped

Arguments

:: WidgetClass self |
=> self |
-> IO Bool | returns `True` if the widget is mapped, `False` otherwise.

Whether the widget is mapped.

# Signals

realize :: WidgetClass self => Signal self (IO ())

The widget should allocate any resources needed, in particular, the widget's `DrawWindow` is created. If you connect to this signal and you rely on some of these resources to be present, you have to use `System.Glib.Signals.after`.

unrealize :: WidgetClass self => Signal self (IO ())

The widget should deallocate any resources. This signal is emitted before the widget is destroyed.

mapSignal :: WidgetClass self => Signal self (IO ())

The widget appears on screen.

unmapSignal :: WidgetClass self => Signal self (IO ())

The widget disappears from the screen.

sizeRequest :: WidgetClass self => Signal self (IO Requisition)

Query the widget for the size it likes to have.

- A parent container emits this signal to its child to query the needed height and width of the child. There is not guarantee that the widget will actually get this area.

sizeAllocate :: WidgetClass self => Signal self (Allocation -> IO ())

Inform widget about the size it has.

- After querying a widget for the size it wants to have (through emitting the `"sizeRequest"` signal) a container will emit this signal to inform the widget about the real size it should occupy.

showSignal :: WidgetClass self => Signal self (IO ())

The widget is shown.

hideSignal :: WidgetClass self => Signal self (IO ())

The widget is hidden.

focus :: WidgetClass self => Signal self (DirectionType -> IO Bool)

The widget gains focus via the given user action.

stateChanged :: WidgetClass self => Signal self (StateType -> IO ())

The state of the widget (input focus, insensitive, etc.) has changed.

parentSet :: WidgetClass self => Signal self (Maybe Widget -> IO ())

The `parentSet` signal is emitted when a new parent has been set on a widget. The parameter is the new parent.

hierarchyChanged :: WidgetClass self => Signal self (Maybe Widget -> IO ())

Emitted when there is a change in the hierarchy to which a widget belong. More precisely, a widget is anchored when its toplevel ancestor is a `Window`. This signal is emitted when a widget changes from un-anchored to anchored or vice-versa.

styleSet :: WidgetClass self => Signal self (Style -> IO ())

The `styleSet` signal is emitted when a new style has been set on a widget. Note that style-modifying functions like `widgetModifyBase` also cause this signal to be emitted.

directionChanged :: WidgetClass self => Signal self (TextDirection -> IO ())

The default direction of text writing has changed.

grabNotify :: WidgetClass self => Signal self (Bool -> IO ())

The `grabNotify` signal is emitted when a widget becomes shadowed by a Gtk+ grab (not a pointer or keyboard grab) on another widget, or when it becomes unshadowed due to a grab being removed.

A widget is shadowed by a `grabAdd` when the topmost grab widget in the grab stack of its window group is not its ancestor.

popupMenuSignal :: WidgetClass self => Signal self (IO Bool)

This signal gets emitted whenever a widget should pop up a context-sensitive menu. This usually happens through the standard key binding mechanism; by pressing a certain key while a widget is focused, the user can cause the widget to pop up a menu. For example, the `Entry` widget creates a menu with clipboard commands.

showHelp :: WidgetClass self => Signal self (WidgetHelpType -> IO Bool)

Tell the widget to show an explanatory help text. Should return `True` if help has been shown.

accelClosuresChanged :: WidgetClass self => Signal self (IO ())

The set of keyboard accelerators has changed.

screenChanged :: WidgetClass self => Signal self (Screen -> IO ())

The widget moved to a new screen.

queryTooltip :: WidgetClass self => Signal self (Widget -> Maybe Point -> Tooltip -> IO Bool)

Emitted when `hasTooltip` is `True` and the `gtkTooltipTimeout` has expired with the cursor hovering above widget; or emitted when widget got focus in keyboard mode.

Using the given coordinates, the signal handler should determine whether a tooltip should be shown for widget. If this is the case `True` should be returned, `False` otherwise. Note if widget got focus in keyboard mode, `Point` is `Nothing`.

The signal handler is free to manipulate tooltip with the therefore destined function calls.

- Available since Gtk+ version 2.12

# Events

buttonPressEvent :: WidgetClass self => Signal self (EventM EButton Bool)

A mouse button has been depressed while the mouse pointer was within the widget area. Sets the widget's `ButtonPressMask` flag.

buttonReleaseEvent :: WidgetClass self => Signal self (EventM EButton Bool)

A mouse button has been released. Sets the widget's `ButtonReleaseMask` flag.

configureEvent :: WidgetClass self => Signal self (EventM EConfigure Bool)

The size of the window has changed.

deleteEvent :: WidgetClass self => Signal self (EventM EAny Bool)

The `deleteEvent` signal is emitted if a user requests that a toplevel window is closed. The default handler for this signal destroys the window. Calling `widgetHide` and returning `True` on reception of this signal will cause the window to be hidden instead, so that it can later be shown again without reconstructing it.

destroyEvent :: WidgetClass self => Signal self (EventM EAny Bool)

The `destroyEvent` signal is emitted when a `DrawWindow` is destroyed. You rarely get this signal, because most widgets disconnect themselves from their window before they destroy it, so no widget owns the window at destroy time. However, you might want to connect to the `objectDestroy` signal of `Object`.

enterNotifyEvent :: WidgetClass self => Signal self (EventM ECrossing Bool)

The mouse pointer has entered the widget. Sets the widget's `EnterNotifyMask` flag.

exposeEvent :: WidgetClass self => Signal self (EventM EExpose Bool)

Instructs the widget to redraw.

- The `DrawWindow` that needs to be redrawn is available via `eventWindow`.
- The part that needs to be redrawn is available via `eventArea` and `eventRegion`. The options are, in order of efficiency: (a) redraw the entire window, (b) ask for the `eventArea` and redraw that rectangle, (c) ask for the `eventRegion` and redraw each of those rectangles.

Only the exposed region will be updated; see also `drawWindowBeginPaintRegion`.

focusInEvent :: WidgetClass self => Signal self (EventM EFocus Bool)

The widget gets the input focus. Sets the widget's `FocusChangeMask` flag.

focusOutEvent :: WidgetClass self => Signal self (EventM EFocus Bool)

The widget lost the input focus. Sets the widget's `FocusChangeMask` flag.

grabBrokenEvent :: WidgetClass self => Signal self (EventM EGrabBroken Bool)

Emitted when a pointer or keyboard grab on a window belonging to `widget` gets broken.

On X11, this happens when the grab window becomes unviewable (i.e. it or one of its ancestors is unmapped), or if the same application grabs the pointer or keyboard again.

- Available since Gtk+ version 2.8

keyPressEvent :: WidgetClass self => Signal self (EventM EKey Bool)

A key has been depressed. Sets the widget's `KeyPressMask` flag.

keyReleaseEvent :: WidgetClass self => Signal self (EventM EKey Bool)

A key has been released. Sets the widget's `KeyReleaseMask` flag.

leaveNotifyEvent :: WidgetClass self => Signal self (EventM ECrossing Bool)

The mouse pointer has left the widget. Sets the widget's `LeaveNotifyMask` flag.

mapEvent :: WidgetClass self => Signal self (EventM EAny Bool)

The window is put onto the screen.

motionNotifyEvent :: WidgetClass self => Signal self (EventM EMotion Bool)

The mouse pointer has moved. Since receiving all mouse movements is expensive, it is necessary to specify exactly what mouse motions are required by calling `widgetAddEvents` on this widget with one or more of the following flags:

- `PointerMotionMask`: Track all movements.
- `ButtonMotionMask`: Only track movements if a button is depressed.
- `Button1MotionMask`: Only track movements if the left button is depressed.
- `Button2MotionMask`: Only track movements if the middle button is depressed.
- `Button3MotionMask`: Only track movements if the right button is depressed. `PointerMotionHintMask` is a special flag which can be used in combination with any of the above and is used to reduce the number of `motionNotifyEvent`s received. Normally a `motionNotifyEvent` event is received each time the mouse moves. However, if the application spends a lot of time processing the event (updating the display, for example), it can lag behind the position of the mouse. When using `PointerMotionHintMask`, fewer `motionNotifyEvent`s will be sent, some of which are marked as a hint. To receive more motion events after a motion hint event, the application needs to asks for more, by calling `Graphics.UI.Gtk.Gdk.EventM.eventRequestMotions`. This effectively limits the rate at which new motion events are received. (Note that you don't need to check if the hint is set as `Graphics.UI.Gtk.Gdk.EventM.eventRequestMotions` does so automatically.)

noExposeEvent :: WidgetClass self => Signal self (EventM EAny Bool)

Generated when the area of a `Drawable` being copied using, e.g. `Graphics.UI.Gtk.Gdk.Drawable.drawDrawable`, is completely available.

proximityInEvent :: WidgetClass self => Signal self (EventM EProximity Bool)

The pen of a graphics tablet was put down. Sets the widget's `ProximityInMask` flag.

proximityOutEvent :: WidgetClass self => Signal self (EventM EProximity Bool)

The pen of a graphics tablet was lifted off the tablet. Sets the widget's `ProximityOutMask` flag.

scrollEvent :: WidgetClass self => Signal self (EventM EScroll Bool)

The scroll wheel of the mouse has been used. Sets the widget's `ScrollMask` flag.

unmapEvent :: WidgetClass self => Signal self (EventM EAny Bool)

The window is taken off the screen.

visibilityNotifyEvent :: WidgetClass self => Signal self (EventM EVisibility Bool)

Emitted when the window visibility status has changed. Sets the widget's `VisibilityNotifyMask` flag.

windowStateEvent :: WidgetClass self => Signal self (EventM EWindowState Bool)

Emitted when the state of the window changes, i.e. when it is minimized, moved to the top, etc.

# Deprecated

onButtonPress :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterButtonPress :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

A Button was pressed.

- This widget is part of a button which was just pressed. The event passed to the user function is a `Button` event.

onButtonRelease :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterButtonRelease :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

A Button was released.

onClient :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterClient :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

onConfigure :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterConfigure :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

The widget's status has changed.

onDelete :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterDelete :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

This signal is emitted when the close icon on the surrounding window is pressed. The default action is to emit the `"destroy"` signal.

onDestroyEvent :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterDestroyEvent :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

The widget will be destroyed.

- The widget received a destroy event from the window manager.

onDirectionChanged :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterDirectionChanged :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

The default text direction was changed.

onEnterNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterEnterNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

Mouse cursor entered widget.

- Contains a `Crossing` event.

onLeaveNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterLeaveNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

Mouse cursor leaves widget.

- Contains a `Crossing` event.

onExpose :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterExpose :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

Instructs the widget to redraw.

- This event is useful for the `DrawingArea`. On receiving this signal the content of the passed Rectangle or Region needs to be redrawn. The return value should be `True` if the region was completely redrawn and `False` if other handlers in the chain should be invoked. If a client will redraw the whole area and is not interested in the extra information in `Expose`, it is more efficient to use `onExposeRect`.
- Widgets that are very expensive to re-render, such as an image editor, may prefer to use the `onExpose` call back which delivers a `Region` in addition to a `Rectangle`. A `Region` consists of several rectangles that need redrawing. The simpler `onExposeRect` event encodes the area to be redrawn as a bounding rectangle which might be easier to deal with in a particular application.

onExposeRect :: WidgetClass w => w -> (Rectangle -> IO ()) -> IO (ConnectId w)

afterExposeRect :: WidgetClass w => w -> (Rectangle -> IO ()) -> IO (ConnectId w)

Expose event delivering a `Rectangle`.

onFocus :: WidgetClass w => w -> (DirectionType -> IO Bool) -> IO (ConnectId w)

afterFocus :: WidgetClass w => w -> (DirectionType -> IO Bool) -> IO (ConnectId w)

This signal is called if the widget receives the input focus.

onFocusIn :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterFocusIn :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

Widget gains input focus.

onFocusOut :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterFocusOut :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

Widget looses input focus.

onGrabFocus :: WidgetClass w => w -> IO () -> IO (ConnectId w)

afterGrabFocus :: WidgetClass w => w -> IO () -> IO (ConnectId w)

The widget is about to receive all events.

- It is possible to redirect all input events to one widget to force the user to use only this widget. Such a situation is initiated by `addGrab`.

onDestroy :: WidgetClass w => w -> IO () -> IO (ConnectId w)

afterDestroy :: WidgetClass w => w -> IO () -> IO (ConnectId w)

The widget will be destroyed.

- This is the last signal this widget will receive.

onHide :: WidgetClass w => w -> IO () -> IO (ConnectId w)

afterHide :: WidgetClass w => w -> IO () -> IO (ConnectId w)

The widget was asked to hide itself.

- This signal is emitted each time `widgetHide` is called. Use `onUnmap` when your application needs to be informed when the widget is actually removed from screen.

onHierarchyChanged :: WidgetClass w => w -> IO () -> IO (ConnectId w)

afterHierarchyChanged :: WidgetClass w => w -> IO () -> IO (ConnectId w)

The toplevel window changed.

- When a subtree of widgets is removed or added from a tree with a toplevel window this signal is emitted. It is emitted on each widget in the detached or attached subtree.

onKeyPress :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterKeyPress :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

A key was pressed.

onKeyRelease :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterKeyRelease :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

A key was released.

onMnemonicActivate :: WidgetClass w => w -> (Bool -> IO Bool) -> IO (ConnectId w)

afterMnemonicActivate :: WidgetClass w => w -> (Bool -> IO Bool) -> IO (ConnectId w)

onMotionNotify :: WidgetClass w => w -> Bool -> (Event -> IO Bool) -> IO (ConnectId w)

afterMotionNotify :: WidgetClass w => w -> Bool -> (Event -> IO Bool) -> IO (ConnectId w)

Track mouse movements.

- If `hint` is False, a callback for every movement of the mouse is generated. To avoid a backlog of mouse messages, it is usually sufficient to sent `hint` to True, generating only one event. The application now has to state that it is ready for the next message by calling `Graphics.UI.Gtk.Gdk.DrawWindow.drawWindowGetPointer`.

onParentSet :: (WidgetClass w, WidgetClass old) => w -> (old -> IO ()) -> IO (ConnectId w)

afterParentSet :: (WidgetClass w, WidgetClass old) => w -> (old -> IO ()) -> IO (ConnectId w)

onPopupMenu :: WidgetClass w => w -> IO () -> IO (ConnectId w)

afterPopupMenu :: WidgetClass w => w -> IO () -> IO (ConnectId w)

onProximityIn :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterProximityIn :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

The input device became active.

- This event indicates that a pen of a graphics tablet or similar device is now touching the tablet.

onProximityOut :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterProximityOut :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

The input device became inactive.

- The pen was removed from the graphics tablet's surface.

onRealize :: WidgetClass w => w -> IO () -> IO (ConnectId w)

afterRealize :: WidgetClass w => w -> IO () -> IO (ConnectId w)

This widget's drawing area is about to be destroyed.

onScroll :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterScroll :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

The mouse wheel has turned.

- The `Event` is always `Scroll`.

onShow :: WidgetClass w => w -> IO () -> IO (ConnectId w)

afterShow :: WidgetClass w => w -> IO () -> IO (ConnectId w)

The widget was asked to show itself.

- This signal is emitted each time `widgetShow` is called. Use `onMap` when your application needs to be informed when the widget is actually shown.

onSizeAllocate :: WidgetClass w => w -> (Allocation -> IO ()) -> IO (ConnectId w)

afterSizeAllocate :: WidgetClass w => w -> (Allocation -> IO ()) -> IO (ConnectId w)

Inform widget about the size it has.

- After querying a widget for the size it wants to have (through emitting the `"sizeRequest"` signal) a container will emit this signal to inform the widget about the real size it should occupy.

onSizeRequest :: WidgetClass w => w -> IO Requisition -> IO (ConnectId w)

afterSizeRequest :: WidgetClass w => w -> IO Requisition -> IO (ConnectId w)

Query the widget for the size it likes to have.

- A parent container emits this signal to its child to query the needed height and width of the child. There is not guarantee that the widget will actually get this area.

onStateChanged :: WidgetClass w => w -> (StateType -> IO ()) -> IO (ConnectId w)

afterStateChanged :: WidgetClass w => w -> (StateType -> IO ()) -> IO (ConnectId w)

onUnmap :: WidgetClass w => w -> IO () -> IO (ConnectId w)

afterUnmap :: WidgetClass w => w -> IO () -> IO (ConnectId w)

The widget was removed from screen.

onUnrealize :: WidgetClass w => w -> IO () -> IO (ConnectId w)

afterUnrealize :: WidgetClass w => w -> IO () -> IO (ConnectId w)

This widget's drawing area is about to be destroyed.

onVisibilityNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterVisibilityNotify :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

onWindowState :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)

afterWindowState :: WidgetClass w => w -> (Event -> IO Bool) -> IO (ConnectId w)