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This commit is contained in:
Antonio Scandurra 2022-04-06 09:08:44 +02:00
parent eb99588368
commit 1453954ef4
2 changed files with 37 additions and 4 deletions
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29
crates/gpui/src/elements/flex.rs
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@ -13,6 +13,7 @@ use serde_json::json;
#[derive(Default)]
struct ScrollState {
scroll_to: Option<usize>,
scroll_position: f32,
}
@ -39,12 +40,19 @@ impl Flex {
Self::new(Axis::Vertical)
}
pub fn scrollable<Tag, C>(mut self, element_id: usize, cx: &mut C) -> Self
pub fn scrollable<Tag, C>(
mut self,
element_id: usize,
scroll_to: Option<usize>,
cx: &mut C,
) -> Self
where
Tag: 'static,
C: ElementStateContext,
{
self.scroll_state = Some(cx.element_state::<Tag, ScrollState>(element_id));
let scroll_state = cx.element_state::<Tag, ScrollState>(element_id);
scroll_state.update(cx, |scroll_state, _| scroll_state.scroll_to = scroll_to);
self.scroll_state = Some(scroll_state);
self
}
@ -185,6 +193,23 @@ impl Element for Flex {
if let Some(scroll_state) = self.scroll_state.as_ref() {
scroll_state.update(cx, |scroll_state, _| {
if let Some(scroll_to) = scroll_state.scroll_to.take() {
let visible_start = scroll_state.scroll_position;
let visible_end = visible_start + size.along(self.axis);
if let Some(child) = self.children.get(scroll_to) {
let child_start: f32 = self.children[..scroll_to]
.iter()
.map(|c| c.size().along(self.axis))
.sum();
let child_end = child_start + child.size().along(self.axis);
if child_start < visible_start {
scroll_state.scroll_position = child_start;
} else if child_end > visible_end {
scroll_state.scroll_position = child_end - size.along(self.axis);
}
}
}
scroll_state.scroll_position =
scroll_state.scroll_position.min(-remaining_space).max(0.);
});