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cre scroll mode: fix highlights not shown when small pages

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The idea of looking for highlights 1 page before and after
was not working when you have multiple small pages, and
some scroll mode view was actually showing 3 or 4 pages.
So, rework that by using absolute positions when looking
for highlights present in the scrolled view.
This commit is contained in:
poire-z
2019-02-26 07:16:43 +01:00
committed by Frans de Jonge
parent 7779f674ee
commit 918f296bd3
2 changed files with 54 additions and 33 deletions
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42
frontend/apps/reader/modules/readerhighlight.lua
View File

@@ -207,10 +207,7 @@ function ReaderHighlight:onTapXPointerSavedHighlight(ges)
-- showing menu...). We might want to cache these boxes per page (and
-- clear that cache when page layout change or highlights are added
-- or removed).
local cur_page
-- In scroll mode, we'll need to check for highlights in previous or next
-- page too as some parts of them may be displayed
local neighbour_pages = self.view.view_mode ~= "page" and 1 or 0
local cur_page, cur_scroll_top, cur_scroll_bottom
local pos = self.view:screenToPageTransform(ges.pos)
for page, _ in pairs(self.view.highlight.saved) do
local items = self.view.highlight.saved[page]
@@ -222,17 +219,32 @@ function ReaderHighlight:onTapXPointerSavedHighlight(ges)
local pos0, pos1 = items[i].pos0, items[i].pos1
-- document:getScreenBoxesFromPositions() is expensive, so we
-- first check this item is on current page
local page0 = self.ui.document:getPageFromXPointer(pos0)
local page1 = self.ui.document:getPageFromXPointer(pos1)
local start_page = math.min(page0, page1)
local end_page = math.max(page0, page1)
-- In scroll mode, we may be displaying cur_page and cur_page+1, so
-- we have to check the highlight start_page is <= cur_page+1.
-- Same thinking with highlight's end_page >= cur_page-1 as we may
-- be displaying a part of cur_page-1.
-- (A highlight starting on cur_page-17 and ending on cur_page+13 is
-- a highlight to consider)
if start_page <= cur_page + neighbour_pages and end_page >= cur_page - neighbour_pages then
local is_in_view = false
if self.view_mode == "page" then
if not cur_page then
cur_page = self.ui.document:getPageFromXPointer(self.ui.document:getXPointer())
end
local page0 = self.ui.document:getPageFromXPointer(pos0)
local page1 = self.ui.document:getPageFromXPointer(pos1)
local start_page = math.min(page0, page1)
local end_page = math.max(page0, page1)
if start_page <= cur_page and end_page >= cur_page then
is_in_view = true
end
else
if not cur_scroll_top then
cur_scroll_top = self.ui.document:getPosFromXPointer(self.ui.document:getXPointer())
cur_scroll_bottom = cur_scroll_top + self.ui.dimen.h
end
local spos0 = self.ui.document:getPosFromXPointer(pos0)
local spos1 = self.ui.document:getPosFromXPointer(pos1)
local start_pos = math.min(spos0, spos1)
local end_pos = math.max(spos0, spos1)
if start_pos <= cur_scroll_bottom and end_pos >= cur_scroll_top then
is_in_view = true
end
end
if is_in_view then
local boxes = self.ui.document:getScreenBoxesFromPositions(pos0, pos1, true) -- get_segments=true
if boxes then
for index, box in pairs(boxes) do