Method

GtkWidgetcompute_transform

Declaration [src]

gboolean
gtk_widget_compute_transform (
  GtkWidget* widget,
  GtkWidget* target,
  graphene_matrix_t* out_transform
)

Description [src]

Computes a matrix suitable to describe a transformation from widget‘s coordinate system into target‘s coordinate system.

The transform can not be computed in certain cases, for example when widget and target do not share a common ancestor. In that case out_transform gets set to the identity matrix.

To learn more about widget coordinate systems, see the coordinate system overview.

Parameters

target

Type: GtkWidget

The target widget that the matrix will transform to.

The data is owned by the caller of the method.

out_transform

Type: graphene_matrix_t

Location to store the final transformation.

The argument will be set by the function.

The returned data is owned by the instance.

Return value

Type: gboolean

True if the transform could be computed.