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ListView: use checked subtraction between focus and scroll index
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@ -294,6 +294,7 @@ impl View for ListView {
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.unwrap_or(0);
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if self.children.len() > req.y {
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// Include a scroll bar
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Vec2::new(label_width + 1 + view_size + 2, req.y)
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} else {
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Vec2::new(label_width + 1 + view_size, self.children.len())
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@ -372,11 +373,16 @@ impl View for ListView {
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// Send the event to the focused child.
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let labels_width = self.labels_width();
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if let ListChild::Row(_, ref mut view) = self.children[self.focus] {
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let y = self.focus - self.scrollbase.start_line;
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let offset = (labels_width + 1, y);
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let result = view.on_event(event.relativized(offset));
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if result.is_consumed() {
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return result;
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// If self.focus < self.scrollbase.start_line, it means the focus is not
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// in view. Something's fishy, so don't send the event.
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if let Some(y) = self.focus.checked_sub(self.scrollbase.start_line) {
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let offset = (labels_width + 1, y);
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let result = view.on_event(event.relativized(offset));
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if result.is_consumed() {
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return result;
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}
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}
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}
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