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comments for clamping scroll offsets

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chrox
2013-03-16 00:05:00 +08:00
parent b77e1145e8
commit e2b16a18a3
1 changed files with 5 additions and 1 deletions
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6
frontend/ui/reader/readerpaging.lua
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@@ -359,7 +359,11 @@ function ReaderPaging:onScrollPageRel(diff)
x = 0,
y = last_page_state.visible_area.h - self.overlap
}
-- scroll down offset should always be greater than 0
-- Scroll down offset should always be greater than 0
-- otherwise if offset is less than 0 the height of blank area will be
-- larger than 0 even if page area is much larger than visible area,
-- which will trigger the drawing of next page leaving part of current
-- page undrawn. This should also be true for scroll up offset.
if offset.y < 0 then offset.y = 0 end
local state = self:updateLastPageState(last_page_state, blank_area, offset)
--DEBUG("updated state", state)