+ try_merge_with = function(self, own_stack, object, obj)
+ local stack = ItemStack(obj.itemstring)
+ if own_stack:get_name() == stack:get_name() and stack:get_free_space() > 0 then
+ local overflow = false
+ local count = stack:get_count() + own_stack:get_count()
+ local max_count = stack:get_stack_max()
+ if count > max_count then
+ overflow = true
+ count = count - max_count
+ else
+ self.itemstring = ''
+ end
+ local pos = object:getpos()
+ pos.y = pos.y + (count - stack:get_count()) / max_count * 0.15
+ object:moveto(pos, false)
+ local s, c
+ local max_count = stack:get_stack_max()
+ local name = stack:get_name()
+ if not overflow then
+ obj.itemstring = name .. " " .. count
+ s = 0.2 + 0.1 * (count / max_count)
+ c = s
+ object:set_properties({
+ visual_size = {x = s, y = s},
+ collisionbox = {-c, -c, -c, c, c, c}
+ })
+ self.object:remove()
+ -- merging succeeded
+ return true
+ else
+ s = 0.4
+ c = 0.3
+ object:set_properties({
+ visual_size = {x = s, y = s},
+ collisionbox = {-c, -c, -c, c, c, c}
+ })
+ obj.itemstring = name .. " " .. max_count
+ s = 0.2 + 0.1 * (count / max_count)
+ c = s
+ self.object:set_properties({
+ visual_size = {x = s, y = s},
+ collisionbox = {-c, -c, -c, c, c, c}
+ })
+ self.itemstring = name .. " " .. count
+ end
+ end
+ -- merging didn't succeed
+ return false
+ end,
+