GtkList::extend_selection
void extend_selection( GtkScrollType
scroll_type
, double position, bool auto_start_selection);
This is quite a complex method that can only be used when the selection
mode is set to GTK_SELECTION_EXTENDED. It duplicates
and resets the focus row (i.e. the row that is marked as selected) and
highlights all the items between that and the anchor item. It has
different behaviours depending on whether or not the list has keyboard
grab, so that putting it into a callback function does not have the same
results as calling it from the main loop.
Selection of all the items in the highlighted range requires that
scroll_vertical() is also set
appropriately.
In general, calling the
extend_selection() method
will only select the last row with focus. It needs to have
toggle_add_mode() set in order to
do this when scroll_vertical() is
set after the list widget has grab.
As with scroll_vertical() , this
method's position parameter is used only when
the GtkScrollType value is set to
GTK_SCROLL_JUMP, and represents a percentage of the
area covered by the scroll. The final parameter negates the method's
functionality completely if set to false.
