GI.Gtk.Objects.EventBox

The EventBox widget is a subclass of Bin which also has its own window. It is useful since it allows you to catch events for widgets which do not have their own window.

Exported types

newtype EventBox

Memory-managed wrapper type.

Constructors

EventBox (ManagedPtr EventBox)

Instances

GObject EventBox

Defined in GI.Gtk.Objects.EventBox

Methods

gobjectType :: EventBox -> IO GType

IsImplementorIface EventBox

Defined in GI.Gtk.Objects.EventBox

IsObject EventBox

Defined in GI.Gtk.Objects.EventBox

IsBuildable EventBox

Defined in GI.Gtk.Objects.EventBox

IsBin EventBox

Defined in GI.Gtk.Objects.EventBox

IsContainer EventBox

Defined in GI.Gtk.Objects.EventBox

IsWidget EventBox

Defined in GI.Gtk.Objects.EventBox

IsEventBox EventBox

Defined in GI.Gtk.Objects.EventBox

class GObject o => IsEventBox o

Type class for types which can be safely cast to EventBox, for instance with toEventBox.

Instances

(GObject a, (UnknownAncestorError EventBox a :: Constraint)) => IsEventBox a

Defined in GI.Gtk.Objects.EventBox

IsEventBox EventBox

Defined in GI.Gtk.Objects.EventBox

toEventBox :: (MonadIO m, IsEventBox o) => o -> m EventBox

Cast to EventBox, for types for which this is known to be safe. For general casts, use castTo.

noEventBox :: Maybe EventBox

A convenience alias for Nothing :: Maybe EventBox.

Methods

getAboveChild

eventBoxGetAboveChild

Arguments

:: (HasCallStack, MonadIO m, IsEventBox a)

=> a

eventBox: a EventBox

-> m Bool

Returns: True if the event box window is above the window of its child

Returns whether the event box window is above or below the windows of its child. See eventBoxSetAboveChild for details.

Since: 2.4

getVisibleWindow

eventBoxGetVisibleWindow

Arguments

:: (HasCallStack, MonadIO m, IsEventBox a)

=> a

eventBox: a EventBox

-> m Bool

Returns: True if the event box window is visible

Returns whether the event box has a visible window. See eventBoxSetVisibleWindow for details.

Since: 2.4

new

eventBoxNew

Arguments

:: (HasCallStack, MonadIO m)

=> m EventBox

Returns: a new EventBox

Creates a new EventBox.

setAboveChild

eventBoxSetAboveChild

Arguments

:: (HasCallStack, MonadIO m, IsEventBox a)

=> a

eventBox: a EventBox

-> Bool

aboveChild: True if the event box window is above its child

-> m ()

Set whether the event box window is positioned above the windows of its child, as opposed to below it. If the window is above, all events inside the event box will go to the event box. If the window is below, events in windows of child widgets will first got to that widget, and then to its parents.

The default is to keep the window below the child.

Since: 2.4

setVisibleWindow

eventBoxSetVisibleWindow

Arguments

:: (HasCallStack, MonadIO m, IsEventBox a)

=> a

eventBox: a EventBox

-> Bool

visibleWindow: True to make the event box have a visible window

-> m ()

Set whether the event box uses a visible or invisible child window. The default is to use visible windows.

In an invisible window event box, the window that the event box creates is a WindowWindowClassInputOnly window, which means that it is invisible and only serves to receive events.

A visible window event box creates a visible (WindowWindowClassInputOutput) window that acts as the parent window for all the widgets contained in the event box.

You should generally make your event box invisible if you just want to trap events. Creating a visible window may cause artifacts that are visible to the user, especially if the user is using a theme with gradients or pixmaps.

The main reason to create a non input-only event box is if you want to set the background to a different color or draw on it.

There is one unexpected issue for an invisible event box that has its window below the child. (See eventBoxSetAboveChild.) Since the input-only window is not an ancestor window of any windows that descendent widgets of the event box create, events on these windows aren’t propagated up by the windowing system, but only by GTK+. The practical effect of this is if an event isn’t in the event mask for the descendant window (see widgetAddEvents), it won’t be received by the event box.

This problem doesn’t occur for visible event boxes, because in that case, the event box window is actually the ancestor of the descendant windows, not just at the same place on the screen.

Since: 2.4

Properties

aboveChild

No description available in the introspection data.

constructEventBoxAboveChild :: IsEventBox o => Bool -> IO (GValueConstruct o)

Construct a GValueConstruct with valid value for the “above-child” property. This is rarely needed directly, but it is used by new.

getEventBoxAboveChild :: (MonadIO m, IsEventBox o) => o -> m Bool

Get the value of the “above-child” property. When overloading is enabled, this is equivalent to

get eventBox #aboveChild

setEventBoxAboveChild :: (MonadIO m, IsEventBox o) => o -> Bool -> m ()

Set the value of the “above-child” property. When overloading is enabled, this is equivalent to

set eventBox [ #aboveChild := value ]

visibleWindow

No description available in the introspection data.

constructEventBoxVisibleWindow :: IsEventBox o => Bool -> IO (GValueConstruct o)

Construct a GValueConstruct with valid value for the “visible-window” property. This is rarely needed directly, but it is used by new.

getEventBoxVisibleWindow :: (MonadIO m, IsEventBox o) => o -> m Bool

Get the value of the “visible-window” property. When overloading is enabled, this is equivalent to

get eventBox #visibleWindow

setEventBoxVisibleWindow :: (MonadIO m, IsEventBox o) => o -> Bool -> m ()

Set the value of the “visible-window” property. When overloading is enabled, this is equivalent to

set eventBox [ #visibleWindow := value ]