Method: UI::ListWidget#scroll_list_up

Defined in:
lib/ektoplayer/ui/widgets/listwidget.rb

#scroll_list_up(n = 1) ⇒ Object 



333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
 
# File 'lib/ektoplayer/ui/widgets/listwidget.rb', line 333

def scroll_list_up(n=1)
   fail ArgumentError unless n
   n = n.clamp(0, items_before_cursor)
   return if n == 0 or @list.empty?
   self.lock

   if index_top == 0
      # list is already on top
      select_from_cursorpos((@cursor - n).clamp(0, cursor_max))
   elsif n < @size.height
      old_index_top = index_top
      old_selected, @selected = @selected, @selected - n

      if lines_after_cursor > n
         write_at(@cursor); render(old_selected) 
      end

      (old_index_top - 1).downto(old_index_top - n).each do |index|
         @win.insert_top; render(index)
      end

      write_at(@cursor); render(@selected, selected: true)

      want_refresh
   else
      @selected -= n
      force_cursorpos(@cursor)
      want_redraw
   end

   self.unlock
end