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This commit is contained in:
Kovid Goyal 2012-05-30 00:10:27 +05:30
parent e692460c6c
commit 433ca9b725
1 changed files with 9 additions and 8 deletions
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17
src/calibre/gui2/viewer/toc.py
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@ -61,26 +61,27 @@ class TOCItem(QStandardItem):
def update_indexing_state(self, spine_index, scroll_pos, anchor_map):
is_being_viewed = False
top, bottom = scroll_pos
# We use bottom-25 in the checks below to account for the case where
# the next entry has some invisible margin that just overlaps with the
# bottom of the screen. In this case it will appear to the user that
# the entry is not visible on the screen. Of course, the margin could
# be larger than 25, but that's a decent compromise. Also we dont want
# to count a partial line as being visible.
if spine_index >= self.starts_at and spine_index <= self.ends_at:
start_pos = anchor_map.get(self.start_anchor, 0)
psp = [anchor_map.get(x, 0) for x in self.possible_end_anchors]
if self.ends_at == spine_index:
psp = [x for x in psp if x >= start_pos]
end_pos = min(psp) if psp else (bottom+1 if self.ends_at ==
end_pos = min(psp) if psp else (bottom+1 if self.ends_at >=
spine_index else 0)
if spine_index > self.starts_at and spine_index < self.ends_at:
is_being_viewed = True
elif spine_index == self.starts_at and top >= start_pos:
elif spine_index == self.starts_at and bottom-25 >= start_pos:
if spine_index != self.ends_at or top < end_pos:
is_being_viewed = True
elif spine_index == self.ends_at and top < end_pos:
if spine_index != self.starts_at or bottom-25 >= start_pos:
# We use -25 to account for the case where the next entry
# has some invisible margin that just overlaps with the
# bottom of the screen. In this case it will appear to the
# user that the entry is not visible on the screen. Of
# course, the margin could be larger than 25, but that's a
# decent compromise.
is_being_viewed = True
changed = is_being_viewed != self.is_being_viewed
self.is_being_viewed = is_being_viewed