GI.Gtk.Objects.OffscreenWindow

GtkOffscreenWindow is strictly intended to be used for obtaining snapshots of widgets that are not part of a normal widget hierarchy. Since OffscreenWindow is a toplevel widget you cannot obtain snapshots of a full window with it since you cannot pack a toplevel widget in another toplevel.

The idea is to take a widget and manually set the state of it, add it to a GtkOffscreenWindow and then retrieve the snapshot as a Surface or Pixbuf.

GtkOffscreenWindow derives from Window only as an implementation detail. Applications should not use any API specific to Window to operate on this object. It should be treated as a Bin that has no parent widget.

When contained offscreen widgets are redrawn, GtkOffscreenWindow will emit a Widget::damage-event signal.

Exported types

newtype OffscreenWindow

Constructors

OffscreenWindow (ManagedPtr OffscreenWindow)

Instances

GObject OffscreenWindow

Methods

gobjectType :: OffscreenWindow -> IO GType

IsImplementorIface OffscreenWindow

IsObject OffscreenWindow

IsWindow OffscreenWindow

IsWidget OffscreenWindow

IsContainer OffscreenWindow

IsBin OffscreenWindow

IsBuildable OffscreenWindow

IsOffscreenWindow OffscreenWindow

class GObject o => IsOffscreenWindow o

Instances

(GObject a, UnknownAncestorError Constraint OffscreenWindow a) => IsOffscreenWindow a

IsOffscreenWindow OffscreenWindow

toOffscreenWindow :: (MonadIO m, IsOffscreenWindow o) => o -> m OffscreenWindow

noOffscreenWindow :: Maybe OffscreenWindow

Methods

getPixbuf

offscreenWindowGetPixbuf

Arguments

:: (HasCallStack, MonadIO m, IsOffscreenWindow a)

=> a

offscreen: the OffscreenWindow contained widget.

-> m (Maybe Pixbuf)

Returns: A Pixbuf pointer, or Nothing.

Retrieves a snapshot of the contained widget in the form of a Pixbuf. This is a new pixbuf with a reference count of 1, and the application should unreference it once it is no longer needed.

Since: 2.20

getSurface

offscreenWindowGetSurface

Arguments

:: (HasCallStack, MonadIO m, IsOffscreenWindow a)

=> a

offscreen: the OffscreenWindow contained widget.

-> m (Maybe Surface)

Returns: A Surface pointer to the offscreen surface, or Nothing.

Retrieves a snapshot of the contained widget in the form of a Surface. If you need to keep this around over window resizes then you should add a reference to it.

Since: 2.20

new

offscreenWindowNew

Arguments

:: (HasCallStack, MonadIO m)

=> m OffscreenWindow

Returns: A pointer to a Widget

Creates a toplevel container widget that is used to retrieve snapshots of widgets without showing them on the screen.

Since: 2.20