GtkAdjustment value to ensure that the range between lower
and upper is in the current page (i.e. between value and value +
page.size).
If the range is larger than the page size, then only the start of it will
be in the current page.
A "changed" signal will be emitted if the value is changed.gtkAdjustmentClampPage(object, lower, upper)objectlowerupper