My first try on your patch show that the scrollbar isn't working, and
modifyng with this make it works even with keyboard:
....
//int ret = 0;
int ret = Fl_Group::handle(e);
....
case FL_Up: // next item up
case FL_Down: { // next item down
Fl_Tree_Item *newitem = next_visible_item(_item_focus, eventkey);
//
next item up|dn
if ( newitem ) {
// any found?
_item_focus = newitem;
// new item becomes new focus widget
if ( _prefs.selectmode() == FL_TREE_SELECT_MULTI &&
// multiselect?
(Fl::event_state() & FL_SHIFT) &&
// Shift-Up?
! newitem->is_selected() ) {
// not already selected?
select(newitem, 1);
// extend selection..
}
//make scrollbar been updated when cursor goes under or over visible item
switch (eventkey) {
case FL_Up:
if(_item_focus->y() < y())
_vscroll->value(_vscroll->value()-_item_focus->h());
break;
case FL_Down:
if((_item_focus->y()+_item_focus->h()) > (y()+h()))
_vscroll->value(_vscroll->value()+_item_focus->h());
break;
}
//end new code
redraw();
// redraw focus box/changes
}
ret = 1;
break;
}
...
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