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Fix possible panic in scrollview with full-height bar

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This commit is contained in:
Alexandre Bury 2018-08-20 14:47:10 -07:00
parent 2167ba68a1
commit 2f0f632e22
1 changed files with 16 additions and 9 deletions
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17
src/views/scroll_view.rs
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@ -306,9 +306,15 @@ where
// The new offset is: // The new offset is:
// thumb_pos * (content + 1 - available) / (available + 1 - thumb size) // thumb_pos * (content + 1 - available) / (available + 1 - thumb size)
let new_offset = ((self.inner_size + (1, 1)).saturating_sub(available) let extra =
* thumb_pos) (available + (1, 1)).saturating_sub(lengths).or_max((1, 1));
.div_up((available + (1, 1)).saturating_sub(lengths));
// We're dividing by this value, so make sure it's positive!
assert!(extra > Vec2::zero());
let new_offset =
((self.inner_size + (1, 1)).saturating_sub(available) * thumb_pos)
.div_up(extra);
let max_offset = self.inner_size.saturating_sub(self.available_size()); let max_offset = self.inner_size.saturating_sub(self.available_size());
self.offset self.offset
.set_axis_from(orientation, &new_offset.or_min(max_offset)); .set_axis_from(orientation, &new_offset.or_min(max_offset));
@ -376,6 +382,8 @@ where
fn scrollbar_thumb_lengths(&self) -> Vec2 { fn scrollbar_thumb_lengths(&self) -> Vec2 {
let available = self.available_size(); let available = self.available_size();
// The length should be (visible / total) * visible
(available * available / self.inner_size.or_max((1, 1))).or_max((1, 1)) (available * available / self.inner_size.or_max((1, 1))).or_max((1, 1))
} }
@ -530,8 +538,7 @@ where
position, position,
offset, offset,
} }
if self.show_scrollbars if self.show_scrollbars && position
&& position
.checked_sub(offset) .checked_sub(offset)
.map(|position| self.start_drag(position)) .map(|position| self.start_drag(position))
.unwrap_or(false) => .unwrap_or(false) =>