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Always re-render visible elements in List
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parent
0fd47da880
commit
e067212ad4
1 changed files with 20 additions and 9 deletions
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@ -131,13 +131,24 @@ impl Element for List {
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let mut cursor = old_items.cursor::<Count>();
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cursor.seek(&Count(scroll_top.item_ix), Bias::Right, &());
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for (ix, item) in cursor.by_ref().enumerate() {
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if rendered_height - scroll_top.offset_in_item >= size.y() + state.overdraw {
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let visible_height = rendered_height - scroll_top.offset_in_item;
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if visible_height >= size.y() + state.overdraw {
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break;
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}
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if let Some(element) =
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state.render_item(scroll_top.item_ix + ix, item, item_constraint, cx)
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{
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// Force re-render if the item is visible, but attempt to re-use an existing one
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// if we are inside the overdraw.
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let existing_element = if visible_height >= size.y() {
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Some(item)
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} else {
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None
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};
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if let Some(element) = state.render_item(
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scroll_top.item_ix + ix,
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existing_element,
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item_constraint,
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cx,
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) {
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rendered_height += element.size().y();
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rendered_items.push_back(ListItem::Rendered(element));
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}
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@ -151,9 +162,9 @@ impl Element for List {
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if rendered_height - scroll_top.offset_in_item < size.y() {
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while rendered_height < size.y() {
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cursor.prev(&());
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if let Some(item) = cursor.item() {
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if cursor.item().is_some() {
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if let Some(element) =
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state.render_item(cursor.start().0, item, item_constraint, cx)
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state.render_item(cursor.start().0, None, item_constraint, cx)
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{
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rendered_height += element.size().y();
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rendered_items.push_front(ListItem::Rendered(element));
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@ -189,7 +200,7 @@ impl Element for List {
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cursor.prev(&());
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if let Some(item) = cursor.item() {
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if let Some(element) =
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state.render_item(cursor.start().0, item, item_constraint, cx)
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state.render_item(cursor.start().0, Some(item), item_constraint, cx)
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{
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leading_overdraw += element.size().y();
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rendered_items.push_front(ListItem::Rendered(element));
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@ -426,11 +437,11 @@ impl StateInner {
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fn render_item(
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&mut self,
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ix: usize,
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existing_item: &ListItem,
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existing_element: Option<&ListItem>,
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constraint: SizeConstraint,
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cx: &mut LayoutContext,
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) -> Option<ElementRc> {
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if let ListItem::Rendered(element) = existing_item {
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if let Some(ListItem::Rendered(element)) = existing_element {
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Some(element.clone())
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} else {
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let mut element = (self.render_item)(ix, cx)?;
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