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Uncomment List tests and fix related problems in WindowContext

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This commit is contained in:
Antonio Scandurra 2023-04-13 11:52:16 +02:00
parent b89c4e06be
commit 702c4ce403
3 changed files with 276 additions and 383 deletions
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81
crates/gpui/src/app.rs
View File

@ -45,7 +45,7 @@ use crate::{
executor::{self, Task},
keymap_matcher::{self, Binding, KeymapContext, KeymapMatcher, Keystroke, MatchResult},
platform::{
self, Appearance, FontSystem, KeyDownEvent, KeyUpEvent, ModifiersChangedEvent, MouseButton,
self, FontSystem, KeyDownEvent, KeyUpEvent, ModifiersChangedEvent, MouseButton,
PathPromptOptions, Platform, PromptLevel, WindowBounds, WindowOptions,
},
util::post_inc,
@ -872,60 +872,6 @@ impl AppContext {
self.active_labeled_tasks.values().cloned()
}
pub fn render_view(&mut self, params: RenderParams) -> Result<Box<dyn AnyRootElement>> {
todo!()
// let window_id = params.window_id;
// let view_id = params.view_id;
// let mut view = self
// .views
// .remove(&(window_id, view_id))
// .ok_or_else(|| anyhow!("view not found"))?;
// let element = view.render(params, self);
// self.views.insert((window_id, view_id), view);
// Ok(element)
}
pub fn render_views(
&mut self,
window_id: usize,
titlebar_height: f32,
appearance: Appearance,
) -> HashMap<usize, Box<dyn AnyRootElement>> {
todo!()
// self.start_frame();
// #[allow(clippy::needless_collect)]
// let view_ids = self
// .views
// .keys()
// .filter_map(|(win_id, view_id)| {
// if *win_id == window_id {
// Some(*view_id)
// } else {
// None
// }
// })
// .collect::<Vec<_>>();
// view_ids
// .into_iter()
// .map(|view_id| {
// (
// view_id,
// self.render_view(RenderParams {
// window_id,
// view_id,
// titlebar_height,
// hovered_region_ids: Default::default(),
// clicked_region_ids: None,
// refreshing: false,
// appearance,
// })
// .unwrap(),
// )
// })
// .collect()
}
pub(crate) fn start_frame(&mut self) {
self.frame_count += 1;
}
@ -2488,19 +2434,8 @@ impl UpdateView for AppContext {
where
T: View,
{
self.update_window(handle.window_id, |cx| {
cx.update_any_view(handle.view_id, |view, cx| {
let mut cx = ViewContext::mutable(cx, handle.view_id);
update(
view.as_any_mut()
.downcast_mut()
.expect("downcast is type safe"),
&mut cx,
)
})
.unwrap() // TODO: Are these unwraps safe?
})
.unwrap()
self.update_window(handle.window_id, |cx| cx.update_view(handle, update))
.unwrap() // TODO: Is this unwrap safe?
}
}
@ -3941,16 +3876,6 @@ impl<'a, T> DerefMut for Reference<'a, T> {
}
}
pub struct RenderParams {
pub window_id: usize,
pub view_id: usize,
pub titlebar_height: f32,
pub hovered_region_ids: HashSet<MouseRegionId>,
pub clicked_region_ids: Option<(HashSet<MouseRegionId>, MouseButton)>,
pub refreshing: bool,
pub appearance: Appearance,
}
#[derive(Debug, Clone, Default)]
pub struct MouseState {
pub(crate) hovered: bool,

102
crates/gpui/src/app/window.rs
View File

@ -14,11 +14,11 @@ use crate::{
text_layout::TextLayoutCache,
util::post_inc,
AnyView, AnyViewHandle, AnyWeakViewHandle, AppContext, Drawable, Entity, ModelContext,
ModelHandle, MouseRegion, MouseRegionId, ParentId, ReadView, RenderParams, SceneBuilder,
UpdateModel, UpdateView, UpgradeViewHandle, View, ViewContext, ViewHandle, WeakViewHandle,
ModelHandle, MouseRegion, MouseRegionId, ParentId, ReadView, SceneBuilder, UpdateModel,
UpdateView, UpgradeViewHandle, View, ViewContext, ViewHandle, WeakViewHandle,
WindowInvalidation,
};
use anyhow::bail;
use anyhow::{anyhow, bail, Result};
use collections::{HashMap, HashSet};
use pathfinder_geometry::vector::{vec2f, Vector2F};
use postage::oneshot;
@ -74,7 +74,7 @@ impl Window {
invalidation: None,
is_fullscreen: false,
platform_window,
rendered_views: cx.render_views(window_id, titlebar_height, appearance),
rendered_views: Default::default(),
cursor_regions: Default::default(),
mouse_regions: Default::default(),
text_layout_cache: TextLayoutCache::new(cx.font_system.clone()),
@ -91,6 +91,9 @@ impl Window {
let root_view = window_context
.build_and_insert_view(ParentId::Root, |cx| Some(build_view(cx)))
.unwrap();
if let Some(mut invalidation) = window_context.window.invalidation.take() {
window_context.invalidate(&mut invalidation, appearance);
}
window.focused_view_id = Some(root_view.id());
window.root_view = Some(root_view.into_any());
window
@ -150,7 +153,16 @@ impl UpdateView for WindowContext<'_, '_> {
where
T: View,
{
self.app_context.update_view(handle, update)
self.update_any_view(handle.view_id, |view, cx| {
let mut cx = ViewContext::mutable(cx, handle.view_id);
update(
view.as_any_mut()
.downcast_mut()
.expect("downcast is type safe"),
&mut cx,
)
})
.unwrap() // TODO: Is this unwrap safe?
}
}
@ -678,7 +690,6 @@ impl<'a: 'b, 'b> WindowContext<'a, 'b> {
self.window.rendered_views.remove(view_id);
}
for view_id in &invalidation.updated {
let window_id = self.window_id;
let titlebar_height = self.window.titlebar_height;
let hovered_region_ids = self.window.hovered_region_ids.clone();
let clicked_region_ids = self
@ -688,7 +699,6 @@ impl<'a: 'b, 'b> WindowContext<'a, 'b> {
let element = self
.render_view(RenderParams {
window_id,
view_id: *view_id,
titlebar_height,
hovered_region_ids,
@ -701,39 +711,16 @@ impl<'a: 'b, 'b> WindowContext<'a, 'b> {
}
}
pub fn refresh(&mut self, invalidation: &mut WindowInvalidation, appearance: Appearance) {
self.invalidate(invalidation, appearance);
let view_ids = self
.window
.rendered_views
.keys()
.copied()
.collect::<Vec<_>>();
for view_id in view_ids {
if !invalidation.updated.contains(&view_id) {
let window_id = self.window_id;
let titlebar_height = self.window.titlebar_height;
let hovered_region_ids = self.window.hovered_region_ids.clone();
let clicked_region_ids = self
.window
.clicked_button
.map(|button| (self.window.clicked_region_ids.clone(), button));
let element = self
.render_view(RenderParams {
window_id,
view_id,
titlebar_height,
hovered_region_ids,
clicked_region_ids,
refreshing: true,
appearance,
})
.unwrap();
self.window.rendered_views.insert(view_id, element);
}
}
pub fn render_view(&mut self, params: RenderParams) -> Result<Box<dyn AnyRootElement>> {
let window_id = self.window_id;
let view_id = params.view_id;
let mut view = self
.views
.remove(&(window_id, view_id))
.ok_or_else(|| anyhow!("view not found"))?;
let element = view.render(self, view_id);
self.views.insert((window_id, view_id), view);
Ok(element)
}
pub fn build_scene(&mut self) -> Scene {
@ -854,32 +841,6 @@ impl<'a: 'b, 'b> WindowContext<'a, 'b> {
self.window.platform_window.prompt(level, msg, answers)
}
fn add_view<T, F>(&mut self, parent: &AnyViewHandle, build_view: F) -> ViewHandle<T>
where
T: View,
F: FnOnce(&mut ViewContext<T>) -> T,
{
if parent.window_id == self.window_id {
self.build_and_insert_view(ParentId::View(parent.view_id), |cx| Some(build_view(cx)))
.unwrap()
} else {
self.app_context.add_view(parent, build_view)
}
}
fn add_option_view<T, F>(
&mut self,
parent_handle: impl Into<AnyViewHandle>,
build_view: F,
) -> Option<ViewHandle<T>>
where
T: View,
F: FnOnce(&mut ViewContext<T>) -> Option<T>,
{
let parent_handle = parent_handle.into();
self.build_and_insert_view(ParentId::View(parent_handle.view_id), build_view)
}
pub fn replace_root_view<V, F>(&mut self, build_root_view: F) -> ViewHandle<V>
where
V: View,
@ -923,6 +884,15 @@ impl<'a: 'b, 'b> WindowContext<'a, 'b> {
}
}
pub struct RenderParams {
pub view_id: usize,
pub titlebar_height: f32,
pub hovered_region_ids: HashSet<MouseRegionId>,
pub clicked_region_ids: Option<(HashSet<MouseRegionId>, MouseButton)>,
pub refreshing: bool,
pub appearance: Appearance,
}
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
pub enum Axis {
#[default]

476
crates/gpui/src/elements/list.rs
View File

@ -648,267 +648,265 @@ mod tests {
use super::*;
use crate::{elements::Empty, geometry::vector::vec2f, Entity};
use rand::prelude::*;
use std::env;
#[crate::test(self)]
fn test_layout(cx: &mut crate::AppContext) {
todo!()
// let (_, view) = cx.add_window(Default::default(), |_| TestView);
// let constraint = SizeConstraint::new(vec2f(0., 0.), vec2f(100., 40.));
cx.add_window(Default::default(), |cx| {
let mut view = TestView;
let constraint = SizeConstraint::new(vec2f(0., 0.), vec2f(100., 40.));
let elements = Rc::new(RefCell::new(vec![(0, 20.), (1, 30.), (2, 100.)]));
let state = ListState::new(elements.borrow().len(), Orientation::Top, 1000.0, {
let elements = elements.clone();
move |_, ix, _| {
let (id, height) = elements.borrow()[ix];
TestElement::new(id, height).boxed()
}
});
// let elements = Rc::new(RefCell::new(vec![(0, 20.), (1, 30.), (2, 100.)]));
let mut list = List::new(state.clone());
let (size, _) = list.layout(constraint, &mut view, cx);
assert_eq!(size, vec2f(100., 40.));
assert_eq!(
state.0.borrow().items.summary().clone(),
ListItemSummary {
count: 3,
rendered_count: 3,
unrendered_count: 0,
height: 150.
}
);
// let state = view.update(cx, |_, cx| {
// ListState::new(elements.borrow().len(), Orientation::Top, 1000.0, cx, {
// let elements = elements.clone();
// move |_, ix, _| {
// let (id, height) = elements.borrow()[ix];
// TestElement::new(id, height).boxed()
// }
// })
// });
state.0.borrow_mut().scroll(
&ListOffset {
item_ix: 0,
offset_in_item: 0.,
},
40.,
vec2f(0., -54.),
true,
&mut view,
cx,
);
// let mut list = List::new(state.clone());
// let (size, _) = list.layout(
// constraint,
// &mut presenter.build_layout_context(vec2f(100., 40.), false, cx),
// );
// assert_eq!(size, vec2f(100., 40.));
// assert_eq!(
// state.0.borrow().items.summary().clone(),
// ListItemSummary {
// count: 3,
// rendered_count: 3,
// unrendered_count: 0,
// height: 150.
// }
// );
let (_, logical_scroll_top) = list.layout(constraint, &mut view, cx);
assert_eq!(
logical_scroll_top,
ListOffset {
item_ix: 2,
offset_in_item: 4.
}
);
assert_eq!(state.0.borrow().scroll_top(&logical_scroll_top), 54.);
// state.0.borrow_mut().scroll(
// &ListOffset {
// item_ix: 0,
// offset_in_item: 0.,
// },
// 40.,
// vec2f(0., -54.),
// true,
// &mut presenter.build_event_context(&mut Default::default(), cx),
// );
// let (_, logical_scroll_top) = list.layout(
// constraint,
// &mut presenter.build_layout_context(vec2f(100., 40.), false, cx),
// );
// assert_eq!(
// logical_scroll_top,
// ListOffset {
// item_ix: 2,
// offset_in_item: 4.
// }
// );
// assert_eq!(state.0.borrow().scroll_top(&logical_scroll_top), 54.);
elements.borrow_mut().splice(1..2, vec![(3, 40.), (4, 50.)]);
elements.borrow_mut().push((5, 60.));
state.splice(1..2, 2);
state.splice(4..4, 1);
assert_eq!(
state.0.borrow().items.summary().clone(),
ListItemSummary {
count: 5,
rendered_count: 2,
unrendered_count: 3,
height: 120.
}
);
// elements.borrow_mut().splice(1..2, vec![(3, 40.), (4, 50.)]);
// elements.borrow_mut().push((5, 60.));
// state.splice(1..2, 2);
// state.splice(4..4, 1);
// assert_eq!(
// state.0.borrow().items.summary().clone(),
// ListItemSummary {
// count: 5,
// rendered_count: 2,
// unrendered_count: 3,
// height: 120.
// }
// );
let (size, logical_scroll_top) = list.layout(constraint, &mut view, cx);
assert_eq!(size, vec2f(100., 40.));
assert_eq!(
state.0.borrow().items.summary().clone(),
ListItemSummary {
count: 5,
rendered_count: 5,
unrendered_count: 0,
height: 270.
}
);
assert_eq!(
logical_scroll_top,
ListOffset {
item_ix: 3,
offset_in_item: 4.
}
);
assert_eq!(state.0.borrow().scroll_top(&logical_scroll_top), 114.);
// let (size, logical_scroll_top) = list.layout(
// constraint,
// &mut presenter.build_layout_context(vec2f(100., 40.), false, cx),
// );
// assert_eq!(size, vec2f(100., 40.));
// assert_eq!(
// state.0.borrow().items.summary().clone(),
// ListItemSummary {
// count: 5,
// rendered_count: 5,
// unrendered_count: 0,
// height: 270.
// }
// );
// assert_eq!(
// logical_scroll_top,
// ListOffset {
// item_ix: 3,
// offset_in_item: 4.
// }
// );
// assert_eq!(state.0.borrow().scroll_top(&logical_scroll_top), 114.);
view
});
}
#[crate::test(self, iterations = 10, seed = 0)]
#[crate::test(self, iterations = 10)]
fn test_random(cx: &mut crate::AppContext, mut rng: StdRng) {
todo!()
// let operations = env::var("OPERATIONS")
// .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
// .unwrap_or(10);
let operations = env::var("OPERATIONS")
.map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
.unwrap_or(10);
// let (window_id, view) = cx.add_window(Default::default(), |_| TestView);
// let mut next_id = 0;
// let elements = Rc::new(RefCell::new(
// (0..rng.gen_range(0..=20))
// .map(|_| {
// let id = next_id;
// next_id += 1;
// (id, rng.gen_range(0..=200) as f32 / 2.0)
// })
// .collect::<Vec<_>>(),
// ));
// let orientation = *[Orientation::Top, Orientation::Bottom]
// .choose(&mut rng)
// .unwrap();
// let overdraw = rng.gen_range(1..=100) as f32;
cx.add_window(Default::default(), |cx| {
let mut view = TestView;
// let state = view.update(cx, |_, cx| {
// ListState::new(elements.borrow().len(), orientation, overdraw, cx, {
// let elements = elements.clone();
// move |_, ix, _| {
// let (id, height) = elements.borrow()[ix];
// TestElement::new(id, height).boxed()
// }
// })
// });
let mut next_id = 0;
let elements = Rc::new(RefCell::new(
(0..rng.gen_range(0..=20))
.map(|_| {
let id = next_id;
next_id += 1;
(id, rng.gen_range(0..=200) as f32 / 2.0)
})
.collect::<Vec<_>>(),
));
let orientation = *[Orientation::Top, Orientation::Bottom]
.choose(&mut rng)
.unwrap();
let overdraw = rng.gen_range(1..=100) as f32;
// let mut width = rng.gen_range(0..=2000) as f32 / 2.;
// let mut height = rng.gen_range(0..=2000) as f32 / 2.;
// log::info!("orientation: {:?}", orientation);
// log::info!("overdraw: {}", overdraw);
// log::info!("elements: {:?}", elements.borrow());
// log::info!("size: ({:?}, {:?})", width, height);
// log::info!("==================");
let state = ListState::new(elements.borrow().len(), orientation, overdraw, {
let elements = elements.clone();
move |_, ix, _| {
let (id, height) = elements.borrow()[ix];
TestElement::new(id, height).boxed()
}
});
// let mut last_logical_scroll_top = None;
// for _ in 0..operations {
// match rng.gen_range(0..=100) {
// 0..=29 if last_logical_scroll_top.is_some() => {
// let delta = vec2f(0., rng.gen_range(-overdraw..=overdraw));
// log::info!(
// "Scrolling by {:?}, previous scroll top: {:?}",
// delta,
// last_logical_scroll_top.unwrap()
// );
// state.0.borrow_mut().scroll(
// last_logical_scroll_top.as_ref().unwrap(),
// height,
// delta,
// true,
// &mut presenter.build_event_context(&mut Default::default(), cx),
// );
// }
// 30..=34 => {
// width = rng.gen_range(0..=2000) as f32 / 2.;
// log::info!("changing width: {:?}", width);
// }
// 35..=54 => {
// height = rng.gen_range(0..=1000) as f32 / 2.;
// log::info!("changing height: {:?}", height);
// }
// _ => {
// let mut elements = elements.borrow_mut();
// let end_ix = rng.gen_range(0..=elements.len());
// let start_ix = rng.gen_range(0..=end_ix);
// let new_elements = (0..rng.gen_range(0..10))
// .map(|_| {
// let id = next_id;
// next_id += 1;
// (id, rng.gen_range(0..=200) as f32 / 2.)
// })
// .collect::<Vec<_>>();
// log::info!("splice({:?}, {:?})", start_ix..end_ix, new_elements);
// state.splice(start_ix..end_ix, new_elements.len());
// elements.splice(start_ix..end_ix, new_elements);
// for (ix, item) in state.0.borrow().items.cursor::<()>().enumerate() {
// if let ListItem::Rendered(element) = item {
// let (expected_id, _) = elements[ix];
// element.with_metadata(|metadata: Option<&usize>| {
// assert_eq!(*metadata.unwrap(), expected_id);
// });
// }
// }
// }
// }
let mut width = rng.gen_range(0..=2000) as f32 / 2.;
let mut height = rng.gen_range(0..=2000) as f32 / 2.;
log::info!("orientation: {:?}", orientation);
log::info!("overdraw: {}", overdraw);
log::info!("elements: {:?}", elements.borrow());
log::info!("size: ({:?}, {:?})", width, height);
log::info!("==================");
// let mut list = List::new(state.clone());
// let window_size = vec2f(width, height);
// let (size, logical_scroll_top) = list.layout(
// SizeConstraint::new(vec2f(0., 0.), window_size),
// &mut presenter.build_layout_context(window_size, false, cx),
// );
// assert_eq!(size, window_size);
// last_logical_scroll_top = Some(logical_scroll_top);
let mut last_logical_scroll_top = None;
for _ in 0..operations {
match rng.gen_range(0..=100) {
0..=29 if last_logical_scroll_top.is_some() => {
let delta = vec2f(0., rng.gen_range(-overdraw..=overdraw));
log::info!(
"Scrolling by {:?}, previous scroll top: {:?}",
delta,
last_logical_scroll_top.unwrap()
);
state.0.borrow_mut().scroll(
last_logical_scroll_top.as_ref().unwrap(),
height,
delta,
true,
&mut view,
cx,
);
}
30..=34 => {
width = rng.gen_range(0..=2000) as f32 / 2.;
log::info!("changing width: {:?}", width);
}
35..=54 => {
height = rng.gen_range(0..=1000) as f32 / 2.;
log::info!("changing height: {:?}", height);
}
_ => {
let mut elements = elements.borrow_mut();
let end_ix = rng.gen_range(0..=elements.len());
let start_ix = rng.gen_range(0..=end_ix);
let new_elements = (0..rng.gen_range(0..10))
.map(|_| {
let id = next_id;
next_id += 1;
(id, rng.gen_range(0..=200) as f32 / 2.)
})
.collect::<Vec<_>>();
log::info!("splice({:?}, {:?})", start_ix..end_ix, new_elements);
state.splice(start_ix..end_ix, new_elements.len());
elements.splice(start_ix..end_ix, new_elements);
for (ix, item) in state.0.borrow().items.cursor::<()>().enumerate() {
if let ListItem::Rendered(element) = item {
let (expected_id, _) = elements[ix];
element.borrow().with_metadata(|metadata: Option<&usize>| {
assert_eq!(*metadata.unwrap(), expected_id);
});
}
}
}
}
// let state = state.0.borrow();
// log::info!("items {:?}", state.items.items(&()));
let mut list = List::new(state.clone());
let window_size = vec2f(width, height);
let (size, logical_scroll_top) = list.layout(
SizeConstraint::new(vec2f(0., 0.), window_size),
&mut view,
cx,
);
assert_eq!(size, window_size);
last_logical_scroll_top = Some(logical_scroll_top);
// let scroll_top = state.scroll_top(&logical_scroll_top);
// let rendered_top = (scroll_top - overdraw).max(0.);
// let rendered_bottom = scroll_top + height + overdraw;
// let mut item_top = 0.;
let state = state.0.borrow();
log::info!("items {:?}", state.items.items(&()));
// log::info!(
// "rendered top {:?}, rendered bottom {:?}, scroll top {:?}",
// rendered_top,
// rendered_bottom,
// scroll_top,
// );
let scroll_top = state.scroll_top(&logical_scroll_top);
let rendered_top = (scroll_top - overdraw).max(0.);
let rendered_bottom = scroll_top + height + overdraw;
let mut item_top = 0.;
// let mut first_rendered_element_top = None;
// let mut last_rendered_element_bottom = None;
// assert_eq!(state.items.summary().count, elements.borrow().len());
// for (ix, item) in state.items.cursor::<()>().enumerate() {
// match item {
// ListItem::Unrendered => {
// let item_bottom = item_top;
// assert!(item_bottom <= rendered_top || item_top >= rendered_bottom);
// item_top = item_bottom;
// }
// ListItem::Removed(height) => {
// let (id, expected_height) = elements.borrow()[ix];
// assert_eq!(
// *height, expected_height,
// "element {} height didn't match",
// id
// );
// let item_bottom = item_top + height;
// assert!(item_bottom <= rendered_top || item_top >= rendered_bottom);
// item_top = item_bottom;
// }
// ListItem::Rendered(element) => {
// let (expected_id, expected_height) = elements.borrow()[ix];
// element.with_metadata(|metadata: Option<&usize>| {
// assert_eq!(*metadata.unwrap(), expected_id);
// });
// assert_eq!(element.size().y(), expected_height);
// let item_bottom = item_top + element.size().y();
// first_rendered_element_top.get_or_insert(item_top);
// last_rendered_element_bottom = Some(item_bottom);
// assert!(item_bottom > rendered_top || item_top < rendered_bottom);
// item_top = item_bottom;
// }
// }
// }
log::info!(
"rendered top {:?}, rendered bottom {:?}, scroll top {:?}",
rendered_top,
rendered_bottom,
scroll_top,
);
// match orientation {
// Orientation::Top => {
// if let Some(first_rendered_element_top) = first_rendered_element_top {
// assert!(first_rendered_element_top <= scroll_top);
// }
// }
// Orientation::Bottom => {
// if let Some(last_rendered_element_bottom) = last_rendered_element_bottom {
// assert!(last_rendered_element_bottom >= scroll_top + height);
// }
// }
// }
// }
let mut first_rendered_element_top = None;
let mut last_rendered_element_bottom = None;
assert_eq!(state.items.summary().count, elements.borrow().len());
for (ix, item) in state.items.cursor::<()>().enumerate() {
match item {
ListItem::Unrendered => {
let item_bottom = item_top;
assert!(item_bottom <= rendered_top || item_top >= rendered_bottom);
item_top = item_bottom;
}
ListItem::Removed(height) => {
let (id, expected_height) = elements.borrow()[ix];
assert_eq!(
*height, expected_height,
"element {} height didn't match",
id
);
let item_bottom = item_top + height;
assert!(item_bottom <= rendered_top || item_top >= rendered_bottom);
item_top = item_bottom;
}
ListItem::Rendered(element) => {
let (expected_id, expected_height) = elements.borrow()[ix];
let element = element.borrow();
element.with_metadata(|metadata: Option<&usize>| {
assert_eq!(*metadata.unwrap(), expected_id);
});
assert_eq!(element.size().y(), expected_height);
let item_bottom = item_top + element.size().y();
first_rendered_element_top.get_or_insert(item_top);
last_rendered_element_bottom = Some(item_bottom);
assert!(item_bottom > rendered_top || item_top < rendered_bottom);
item_top = item_bottom;
}
}
}
match orientation {
Orientation::Top => {
if let Some(first_rendered_element_top) = first_rendered_element_top {
assert!(first_rendered_element_top <= scroll_top);
}
}
Orientation::Bottom => {
if let Some(last_rendered_element_bottom) = last_rendered_element_bottom {
assert!(last_rendered_element_bottom >= scroll_top + height);
}
}
}
}
view
});
}
struct TestView;