zed/gpui/src/app.rs

3806 lines
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Rust
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use crate::{
elements::ElementBox,
executor,
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keymap::{self, Keystroke},
platform::{self, WindowOptions},
presenter::Presenter,
util::{post_inc, timeout},
AssetCache, AssetSource, ClipboardItem, FontCache, PathPromptOptions, TextLayoutCache,
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};
use anyhow::{anyhow, Result};
use keymap::MatchResult;
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use parking_lot::{Mutex, RwLock};
use pathfinder_geometry::{rect::RectF, vector::vec2f};
use platform::Event;
use postage::{mpsc, sink::Sink as _, stream::Stream as _};
use smol::prelude::*;
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use std::{
any::{type_name, Any, TypeId},
cell::RefCell,
collections::{HashMap, HashSet, VecDeque},
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fmt::{self, Debug},
hash::{Hash, Hasher},
marker::PhantomData,
path::{Path, PathBuf},
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rc::{self, Rc},
sync::{Arc, Weak},
time::Duration,
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};
pub trait Entity: 'static + Send + Sync {
type Event;
}
pub trait View: Entity {
fn ui_name() -> &'static str;
fn render<'a>(&self, app: &AppContext) -> ElementBox;
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fn on_focus(&mut self, _ctx: &mut ViewContext<Self>) {}
fn on_blur(&mut self, _ctx: &mut ViewContext<Self>) {}
fn keymap_context(&self, _: &AppContext) -> keymap::Context {
Self::default_keymap_context()
}
fn default_keymap_context() -> keymap::Context {
let mut ctx = keymap::Context::default();
ctx.set.insert(Self::ui_name().into());
ctx
}
}
pub trait ReadModel {
fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T;
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}
pub trait UpdateModel {
fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
where
T: Entity,
F: FnOnce(&mut T, &mut ModelContext<T>) -> S;
}
pub trait ReadView {
fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T;
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}
pub trait UpdateView {
fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
where
T: View,
F: FnOnce(&mut T, &mut ViewContext<T>) -> S;
}
pub struct Menu<'a> {
pub name: &'a str,
pub items: Vec<MenuItem<'a>>,
}
pub enum MenuItem<'a> {
Action {
name: &'a str,
keystroke: Option<&'a str>,
action: &'a str,
arg: Option<Box<dyn Any + 'static>>,
},
Separator,
}
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#[derive(Clone)]
pub struct App(Rc<RefCell<MutableAppContext>>);
#[derive(Clone)]
pub struct TestAppContext(Rc<RefCell<MutableAppContext>>, Rc<platform::test::Platform>);
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impl App {
pub fn test<T, A: AssetSource, F: FnOnce(&mut MutableAppContext) -> T>(
asset_source: A,
f: F,
) -> T {
let platform = platform::test::platform();
let foreground = Rc::new(executor::Foreground::test());
let ctx = Rc::new(RefCell::new(MutableAppContext::new(
foreground,
Rc::new(platform),
asset_source,
)));
ctx.borrow_mut().weak_self = Some(Rc::downgrade(&ctx));
let mut ctx = ctx.borrow_mut();
f(&mut *ctx)
}
pub fn test_async<T, F, A: AssetSource, Fn>(asset_source: A, f: Fn) -> T
where
Fn: FnOnce(TestAppContext) -> F,
F: Future<Output = T>,
{
let platform = Rc::new(platform::test::platform());
let foreground = Rc::new(executor::Foreground::test());
let ctx = TestAppContext(
Rc::new(RefCell::new(MutableAppContext::new(
foreground.clone(),
platform.clone(),
asset_source,
))),
platform,
);
ctx.0.borrow_mut().weak_self = Some(Rc::downgrade(&ctx.0));
let future = f(ctx);
smol::block_on(foreground.run(future))
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}
pub fn new(asset_source: impl AssetSource) -> Result<Self> {
let platform = platform::current::platform();
let foreground = Rc::new(executor::Foreground::platform(platform.dispatcher())?);
let app = Self(Rc::new(RefCell::new(MutableAppContext::new(
foreground,
platform.clone(),
asset_source,
))));
let ctx = app.0.clone();
platform.on_menu_command(Box::new(move |command, arg| {
let mut ctx = ctx.borrow_mut();
if let Some(key_window_id) = ctx.platform.key_window_id() {
if let Some((presenter, _)) =
ctx.presenters_and_platform_windows.get(&key_window_id)
{
let presenter = presenter.clone();
let path = presenter.borrow().dispatch_path(ctx.as_ref());
ctx.dispatch_action_any(key_window_id, &path, command, arg.unwrap_or(&()));
} else {
ctx.dispatch_global_action_any(command, arg.unwrap_or(&()));
}
} else {
ctx.dispatch_global_action_any(command, arg.unwrap_or(&()));
}
}));
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app.0.borrow_mut().weak_self = Some(Rc::downgrade(&app.0));
Ok(app)
}
pub fn on_become_active<F>(self, mut callback: F) -> Self
where
F: 'static + FnMut(&mut MutableAppContext),
{
let ctx = self.0.clone();
self.0
.borrow()
.platform
.on_become_active(Box::new(move || callback(&mut *ctx.borrow_mut())));
self
}
pub fn on_resign_active<F>(self, mut callback: F) -> Self
where
F: 'static + FnMut(&mut MutableAppContext),
{
let ctx = self.0.clone();
self.0
.borrow()
.platform
.on_resign_active(Box::new(move || callback(&mut *ctx.borrow_mut())));
self
}
pub fn on_event<F>(self, mut callback: F) -> Self
where
F: 'static + FnMut(Event, &mut MutableAppContext) -> bool,
{
let ctx = self.0.clone();
self.0.borrow().platform.on_event(Box::new(move |event| {
callback(event, &mut *ctx.borrow_mut())
}));
self
}
pub fn on_open_files<F>(self, mut callback: F) -> Self
where
F: 'static + FnMut(Vec<PathBuf>, &mut MutableAppContext),
{
let ctx = self.0.clone();
self.0
.borrow()
.platform
.on_open_files(Box::new(move |paths| {
callback(paths, &mut *ctx.borrow_mut())
}));
self
}
pub fn run<F>(self, on_finish_launching: F)
where
F: 'static + FnOnce(&mut MutableAppContext),
{
let platform = self.0.borrow().platform.clone();
platform.run(Box::new(move || {
let mut ctx = self.0.borrow_mut();
on_finish_launching(&mut *ctx);
}))
}
pub fn font_cache(&self) -> Arc<FontCache> {
self.0.borrow().ctx.font_cache.clone()
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}
fn update<T, F: FnOnce(&mut MutableAppContext) -> T>(&mut self, callback: F) -> T {
let mut state = self.0.borrow_mut();
state.pending_flushes += 1;
let result = callback(&mut *state);
state.flush_effects();
result
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}
}
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impl TestAppContext {
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pub fn dispatch_action<T: 'static + Any>(
&self,
window_id: usize,
responder_chain: Vec<usize>,
name: &str,
arg: T,
) {
self.0.borrow_mut().dispatch_action_any(
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window_id,
&responder_chain,
name,
Box::new(arg).as_ref(),
);
}
pub fn dispatch_keystroke(
&self,
window_id: usize,
responder_chain: Vec<usize>,
keystroke: &Keystroke,
) -> Result<bool> {
let mut state = self.0.borrow_mut();
state.dispatch_keystroke(window_id, responder_chain, keystroke)
}
pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
where
T: Entity,
F: FnOnce(&mut ModelContext<T>) -> T,
{
let mut state = self.0.borrow_mut();
state.pending_flushes += 1;
let handle = state.add_model(build_model);
state.flush_effects();
handle
}
pub fn add_window<T, F>(&mut self, build_root_view: F) -> (usize, ViewHandle<T>)
where
T: View,
F: FnOnce(&mut ViewContext<T>) -> T,
{
self.0.borrow_mut().add_window(build_root_view)
}
pub fn window_ids(&self) -> Vec<usize> {
self.0.borrow().window_ids().collect()
}
pub fn root_view<T: View>(&self, window_id: usize) -> Option<ViewHandle<T>> {
self.0.borrow().root_view(window_id)
}
pub fn add_view<T, F>(&mut self, window_id: usize, build_view: F) -> ViewHandle<T>
where
T: View,
F: FnOnce(&mut ViewContext<T>) -> T,
{
let mut state = self.0.borrow_mut();
state.pending_flushes += 1;
let handle = state.add_view(window_id, build_view);
state.flush_effects();
handle
}
pub fn add_option_view<T, F>(
&mut self,
window_id: usize,
build_view: F,
) -> Option<ViewHandle<T>>
where
T: View,
F: FnOnce(&mut ViewContext<T>) -> Option<T>,
{
let mut state = self.0.borrow_mut();
state.pending_flushes += 1;
let handle = state.add_option_view(window_id, build_view);
state.flush_effects();
handle
}
pub fn read<T, F: FnOnce(&AppContext) -> T>(&self, callback: F) -> T {
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callback(self.0.borrow().as_ref())
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}
pub fn update<T, F: FnOnce(&mut MutableAppContext) -> T>(&mut self, callback: F) -> T {
let mut state = self.0.borrow_mut();
// Don't increment pending flushes in order to effects to be flushed before the callback
// completes, which is helpful in tests.
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let result = callback(&mut *state);
// Flush effects after the callback just in case there are any. This can happen in edge
// cases such as the closure dropping handles.
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state.flush_effects();
result
}
pub fn font_cache(&self) -> Arc<FontCache> {
self.0.borrow().ctx.font_cache.clone()
}
pub fn platform(&self) -> Rc<dyn platform::Platform> {
self.0.borrow().platform.clone()
}
pub fn simulate_new_path_selection(&self, result: impl FnOnce(PathBuf) -> Option<PathBuf>) {
self.1.as_ref().simulate_new_path_selection(result);
}
pub fn did_prompt_for_new_path(&self) -> bool {
self.1.as_ref().did_prompt_for_new_path()
}
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}
impl UpdateModel for TestAppContext {
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fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
where
T: Entity,
F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
{
let mut state = self.0.borrow_mut();
state.pending_flushes += 1;
let result = state.update_model(handle, update);
state.flush_effects();
result
}
}
impl UpdateView for TestAppContext {
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fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
where
T: View,
F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
{
let mut state = self.0.borrow_mut();
state.pending_flushes += 1;
let result = state.update_view(handle, update);
state.flush_effects();
result
}
}
type ActionCallback =
dyn FnMut(&mut dyn AnyView, &dyn Any, &mut MutableAppContext, usize, usize) -> bool;
type GlobalActionCallback = dyn FnMut(&dyn Any, &mut MutableAppContext);
pub struct MutableAppContext {
weak_self: Option<rc::Weak<RefCell<Self>>>,
platform: Rc<dyn platform::Platform>,
assets: Arc<AssetCache>,
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ctx: AppContext,
actions: HashMap<TypeId, HashMap<String, Vec<Box<ActionCallback>>>>,
global_actions: HashMap<String, Vec<Box<GlobalActionCallback>>>,
keystroke_matcher: keymap::Matcher,
next_entity_id: usize,
next_window_id: usize,
next_task_id: usize,
subscriptions: HashMap<usize, Vec<Subscription>>,
model_observations: HashMap<usize, Vec<ModelObservation>>,
view_observations: HashMap<usize, Vec<ViewObservation>>,
presenters_and_platform_windows:
HashMap<usize, (Rc<RefCell<Presenter>>, Box<dyn platform::Window>)>,
debug_elements_callbacks: HashMap<usize, Box<dyn Fn(&AppContext) -> crate::json::Value>>,
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foreground: Rc<executor::Foreground>,
future_handlers: Rc<RefCell<HashMap<usize, FutureHandler>>>,
stream_handlers: Rc<RefCell<HashMap<usize, StreamHandler>>>,
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pending_effects: VecDeque<Effect>,
pending_flushes: usize,
flushing_effects: bool,
}
impl MutableAppContext {
pub fn new(
foreground: Rc<executor::Foreground>,
platform: Rc<dyn platform::Platform>,
asset_source: impl AssetSource,
) -> Self {
let fonts = platform.fonts();
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Self {
weak_self: None,
platform,
assets: Arc::new(AssetCache::new(asset_source)),
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ctx: AppContext {
models: Default::default(),
views: Default::default(),
windows: Default::default(),
values: Default::default(),
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ref_counts: Arc::new(Mutex::new(RefCounts::default())),
background: Arc::new(executor::Background::new()),
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thread_pool: scoped_pool::Pool::new(num_cpus::get(), "app"),
font_cache: Arc::new(FontCache::new(fonts)),
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},
actions: HashMap::new(),
global_actions: HashMap::new(),
keystroke_matcher: keymap::Matcher::default(),
next_entity_id: 0,
next_window_id: 0,
next_task_id: 0,
subscriptions: HashMap::new(),
model_observations: HashMap::new(),
view_observations: HashMap::new(),
presenters_and_platform_windows: HashMap::new(),
debug_elements_callbacks: HashMap::new(),
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foreground,
future_handlers: Default::default(),
stream_handlers: Default::default(),
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pending_effects: VecDeque::new(),
pending_flushes: 0,
flushing_effects: false,
}
}
pub fn upgrade(&self) -> App {
App(self.weak_self.as_ref().unwrap().upgrade().unwrap())
}
pub fn platform(&self) -> Rc<dyn platform::Platform> {
self.platform.clone()
}
pub fn font_cache(&self) -> &Arc<FontCache> {
&self.ctx.font_cache
}
pub fn foreground_executor(&self) -> &Rc<executor::Foreground> {
&self.foreground
}
pub fn background_executor(&self) -> &Arc<executor::Background> {
&self.ctx.background
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}
pub fn on_debug_elements<F>(&mut self, window_id: usize, callback: F)
where
F: 'static + Fn(&AppContext) -> crate::json::Value,
{
self.debug_elements_callbacks
.insert(window_id, Box::new(callback));
}
pub fn debug_elements(&self, window_id: usize) -> Option<crate::json::Value> {
self.debug_elements_callbacks
.get(&window_id)
.map(|debug_elements| debug_elements(&self.ctx))
}
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pub fn add_action<S, V, T, F>(&mut self, name: S, mut handler: F)
where
S: Into<String>,
V: View,
T: Any,
F: 'static + FnMut(&mut V, &T, &mut ViewContext<V>),
{
let name = name.into();
let name_clone = name.clone();
let handler = Box::new(
move |view: &mut dyn AnyView,
arg: &dyn Any,
app: &mut MutableAppContext,
window_id: usize,
view_id: usize| {
match arg.downcast_ref() {
Some(arg) => {
let mut ctx = ViewContext::new(app, window_id, view_id);
handler(
view.as_any_mut()
.downcast_mut()
.expect("downcast is type safe"),
arg,
&mut ctx,
);
ctx.halt_action_dispatch
}
None => {
log::error!("Could not downcast argument for action {}", name_clone);
false
}
}
},
);
self.actions
.entry(TypeId::of::<V>())
.or_default()
.entry(name)
.or_default()
.push(handler);
}
pub fn add_global_action<S, T, F>(&mut self, name: S, mut handler: F)
where
S: Into<String>,
T: 'static + Any,
F: 'static + FnMut(&T, &mut MutableAppContext),
{
let name = name.into();
let name_clone = name.clone();
let handler = Box::new(move |arg: &dyn Any, app: &mut MutableAppContext| {
if let Some(arg) = arg.downcast_ref() {
handler(arg, app);
} else {
log::error!("Could not downcast argument for action {}", name_clone);
}
});
self.global_actions.entry(name).or_default().push(handler);
}
pub fn window_ids(&self) -> impl Iterator<Item = usize> + '_ {
self.ctx.windows.keys().cloned()
}
pub fn root_view<T: View>(&self, window_id: usize) -> Option<ViewHandle<T>> {
self.ctx
.windows
.get(&window_id)
.and_then(|window| window.root_view.clone().downcast::<T>())
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}
pub fn root_view_id(&self, window_id: usize) -> Option<usize> {
self.ctx.root_view_id(window_id)
}
pub fn focused_view_id(&self, window_id: usize) -> Option<usize> {
self.ctx.focused_view_id(window_id)
}
pub fn render_view(&self, window_id: usize, view_id: usize) -> Result<ElementBox> {
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self.ctx.render_view(window_id, view_id)
}
pub fn render_views(&self, window_id: usize) -> HashMap<usize, ElementBox> {
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self.ctx.render_views(window_id)
}
pub fn update<T, F: FnOnce() -> T>(&mut self, callback: F) -> T {
self.pending_flushes += 1;
let result = callback();
self.flush_effects();
result
}
pub fn set_menus(&self, menus: Vec<Menu>) {
self.platform.set_menus(menus);
}
pub fn prompt_for_paths<F>(&self, options: PathPromptOptions, done_fn: F)
where
F: 'static + FnOnce(Option<Vec<PathBuf>>, &mut MutableAppContext),
{
let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
let foreground = self.foreground.clone();
self.platform().prompt_for_paths(
options,
Box::new(move |paths| {
foreground
.spawn(async move { (done_fn)(paths, &mut *app.borrow_mut()) })
.detach();
}),
);
}
pub fn prompt_for_new_path<F>(&self, directory: &Path, done_fn: F)
where
F: 'static + FnOnce(Option<PathBuf>, &mut MutableAppContext),
{
let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
let foreground = self.foreground.clone();
self.platform().prompt_for_new_path(
directory,
Box::new(move |path| {
foreground
.spawn(async move { (done_fn)(path, &mut *app.borrow_mut()) })
.detach();
}),
);
}
pub(crate) fn notify_view(&mut self, window_id: usize, view_id: usize) {
self.pending_effects
.push_back(Effect::ViewNotification { window_id, view_id });
}
pub fn dispatch_action<T: 'static + Any>(
&mut self,
window_id: usize,
responder_chain: Vec<usize>,
name: &str,
arg: T,
) {
self.dispatch_action_any(window_id, &responder_chain, name, Box::new(arg).as_ref());
}
pub(crate) fn dispatch_action_any(
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&mut self,
window_id: usize,
path: &[usize],
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name: &str,
arg: &dyn Any,
) -> bool {
self.pending_flushes += 1;
let mut halted_dispatch = false;
for view_id in path.iter().rev() {
if let Some(mut view) = self.ctx.views.remove(&(window_id, *view_id)) {
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let type_id = view.as_any().type_id();
if let Some((name, mut handlers)) = self
.actions
.get_mut(&type_id)
.and_then(|h| h.remove_entry(name))
{
for handler in handlers.iter_mut().rev() {
let halt_dispatch = handler(view.as_mut(), arg, self, window_id, *view_id);
if halt_dispatch {
halted_dispatch = true;
break;
}
}
self.actions
.get_mut(&type_id)
.unwrap()
.insert(name, handlers);
}
self.ctx.views.insert((window_id, *view_id), view);
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if halted_dispatch {
break;
}
}
}
if !halted_dispatch {
self.dispatch_global_action_any(name, arg);
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}
self.flush_effects();
halted_dispatch
}
pub fn dispatch_global_action<T: 'static + Any>(&mut self, name: &str, arg: T) {
self.dispatch_global_action_any(name, Box::new(arg).as_ref());
}
fn dispatch_global_action_any(&mut self, name: &str, arg: &dyn Any) {
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if let Some((name, mut handlers)) = self.global_actions.remove_entry(name) {
self.pending_flushes += 1;
for handler in handlers.iter_mut().rev() {
handler(arg, self);
}
self.global_actions.insert(name, handlers);
self.flush_effects();
}
}
pub fn add_bindings<T: IntoIterator<Item = keymap::Binding>>(&mut self, bindings: T) {
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self.keystroke_matcher.add_bindings(bindings);
}
pub fn dispatch_keystroke(
&mut self,
window_id: usize,
responder_chain: Vec<usize>,
keystroke: &Keystroke,
) -> Result<bool> {
let mut context_chain = Vec::new();
let mut context = keymap::Context::default();
for view_id in &responder_chain {
if let Some(view) = self.ctx.views.get(&(window_id, *view_id)) {
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context.extend(view.keymap_context(self.as_ref()));
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context_chain.push(context.clone());
} else {
return Err(anyhow!(
"View {} in responder chain does not exist",
view_id
));
}
}
let mut pending = false;
for (i, ctx) in context_chain.iter().enumerate().rev() {
match self
.keystroke_matcher
.push_keystroke(keystroke.clone(), responder_chain[i], ctx)
{
MatchResult::None => {}
MatchResult::Pending => pending = true,
MatchResult::Action { name, arg } => {
if self.dispatch_action_any(
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window_id,
&responder_chain[0..=i],
&name,
arg.as_ref().map(|arg| arg.as_ref()).unwrap_or(&()),
) {
return Ok(true);
}
}
}
}
Ok(pending)
}
pub fn add_model<T, F>(&mut self, build_model: F) -> ModelHandle<T>
where
T: Entity,
F: FnOnce(&mut ModelContext<T>) -> T,
{
self.pending_flushes += 1;
let model_id = post_inc(&mut self.next_entity_id);
let handle = ModelHandle::new(model_id, &self.ctx.ref_counts);
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let mut ctx = ModelContext::new(self, model_id);
let model = build_model(&mut ctx);
self.ctx.models.insert(model_id, Box::new(model));
self.flush_effects();
handle
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}
pub fn add_window<T, F>(&mut self, build_root_view: F) -> (usize, ViewHandle<T>)
where
T: View,
F: FnOnce(&mut ViewContext<T>) -> T,
{
self.pending_flushes += 1;
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let window_id = post_inc(&mut self.next_window_id);
let root_view = self.add_view(window_id, build_root_view);
self.ctx.windows.insert(
window_id,
Window {
root_view: root_view.clone().into(),
focused_view_id: root_view.id(),
invalidation: None,
},
);
self.open_platform_window(window_id);
root_view.update(self, |view, ctx| view.on_focus(ctx));
self.flush_effects();
(window_id, root_view)
}
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pub fn remove_window(&mut self, window_id: usize) {
self.ctx.windows.remove(&window_id);
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self.presenters_and_platform_windows.remove(&window_id);
self.remove_dropped_entities();
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}
fn open_platform_window(&mut self, window_id: usize) {
let mut window = self.platform.open_window(
window_id,
WindowOptions {
bounds: RectF::new(vec2f(0., 0.), vec2f(1024., 768.)),
title: "Zed".into(),
},
self.foreground.clone(),
);
let text_layout_cache = TextLayoutCache::new(self.platform.fonts());
let presenter = Rc::new(RefCell::new(Presenter::new(
window_id,
self.ctx.font_cache.clone(),
text_layout_cache,
self.assets.clone(),
self,
)));
{
let mut app = self.upgrade();
let presenter = presenter.clone();
window.on_event(Box::new(move |event| {
app.update(|ctx| {
if let Event::KeyDown { keystroke, .. } = &event {
if ctx
.dispatch_keystroke(
window_id,
presenter.borrow().dispatch_path(ctx.as_ref()),
keystroke,
)
.unwrap()
{
return;
}
}
presenter.borrow_mut().dispatch_event(event, ctx);
})
}));
}
{
let mut app = self.upgrade();
let presenter = presenter.clone();
window.on_resize(Box::new(move |window| {
app.update(|ctx| {
let scene = presenter.borrow_mut().build_scene(
window.size(),
window.scale_factor(),
ctx,
);
window.present_scene(scene);
})
}));
}
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{
let mut app = self.upgrade();
window.on_close(Box::new(move || {
app.update(|ctx| ctx.remove_window(window_id));
}));
}
self.presenters_and_platform_windows
.insert(window_id, (presenter.clone(), window));
self.on_debug_elements(window_id, move |ctx| {
presenter.borrow().debug_elements(ctx).unwrap()
});
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}
pub fn add_view<T, F>(&mut self, window_id: usize, build_view: F) -> ViewHandle<T>
where
T: View,
F: FnOnce(&mut ViewContext<T>) -> T,
{
self.add_option_view(window_id, |ctx| Some(build_view(ctx)))
.unwrap()
}
pub fn add_option_view<T, F>(
&mut self,
window_id: usize,
build_view: F,
) -> Option<ViewHandle<T>>
where
T: View,
F: FnOnce(&mut ViewContext<T>) -> Option<T>,
{
let view_id = post_inc(&mut self.next_entity_id);
self.pending_flushes += 1;
let handle = ViewHandle::new(window_id, view_id, &self.ctx.ref_counts);
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let mut ctx = ViewContext::new(self, window_id, view_id);
let handle = if let Some(view) = build_view(&mut ctx) {
self.ctx.views.insert((window_id, view_id), Box::new(view));
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if let Some(window) = self.ctx.windows.get_mut(&window_id) {
window
.invalidation
.get_or_insert_with(Default::default)
.updated
.insert(view_id);
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}
Some(handle)
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} else {
None
};
self.flush_effects();
handle
}
fn remove_dropped_entities(&mut self) {
loop {
let (dropped_models, dropped_views, dropped_values) =
self.ctx.ref_counts.lock().take_dropped();
if dropped_models.is_empty() && dropped_views.is_empty() && dropped_values.is_empty() {
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break;
}
for model_id in dropped_models {
self.ctx.models.remove(&model_id);
self.subscriptions.remove(&model_id);
self.model_observations.remove(&model_id);
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}
for (window_id, view_id) in dropped_views {
self.subscriptions.remove(&view_id);
self.model_observations.remove(&view_id);
self.ctx.views.remove(&(window_id, view_id));
let change_focus_to = self.ctx.windows.get_mut(&window_id).and_then(|window| {
window
.invalidation
.get_or_insert_with(Default::default)
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.removed
.push(view_id);
if window.focused_view_id == view_id {
Some(window.root_view.id())
} else {
None
}
});
if let Some(view_id) = change_focus_to {
self.focus(window_id, view_id);
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}
}
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let mut values = self.ctx.values.write();
for key in dropped_values {
values.remove(&key);
}
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}
}
fn flush_effects(&mut self) {
self.pending_flushes = self.pending_flushes.saturating_sub(1);
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if !self.flushing_effects && self.pending_flushes == 0 {
self.flushing_effects = true;
loop {
if let Some(effect) = self.pending_effects.pop_front() {
match effect {
Effect::Event { entity_id, payload } => self.emit_event(entity_id, payload),
Effect::ModelNotification { model_id } => {
self.notify_model_observers(model_id)
}
Effect::ViewNotification { window_id, view_id } => {
self.notify_view_observers(window_id, view_id)
}
Effect::Focus { window_id, view_id } => {
self.focus(window_id, view_id);
}
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}
} else {
self.remove_dropped_entities();
self.update_windows();
if self.pending_effects.is_empty() {
self.flushing_effects = false;
break;
}
}
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}
}
}
fn update_windows(&mut self) {
let mut invalidations = HashMap::new();
for (window_id, window) in &mut self.ctx.windows {
if let Some(invalidation) = window.invalidation.take() {
invalidations.insert(*window_id, invalidation);
}
}
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for (window_id, invalidation) in invalidations {
if let Some((presenter, mut window)) =
self.presenters_and_platform_windows.remove(&window_id)
{
{
let mut presenter = presenter.borrow_mut();
presenter.invalidate(invalidation, self.as_ref());
let scene = presenter.build_scene(window.size(), window.scale_factor(), self);
window.present_scene(scene);
}
self.presenters_and_platform_windows
.insert(window_id, (presenter, window));
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}
}
}
fn emit_event(&mut self, entity_id: usize, payload: Box<dyn Any>) {
if let Some(subscriptions) = self.subscriptions.remove(&entity_id) {
for mut subscription in subscriptions {
let alive = match &mut subscription {
Subscription::FromModel { model_id, callback } => {
if let Some(mut model) = self.ctx.models.remove(model_id) {
callback(model.as_any_mut(), payload.as_ref(), self, *model_id);
self.ctx.models.insert(*model_id, model);
true
} else {
false
}
}
Subscription::FromView {
window_id,
view_id,
callback,
} => {
if let Some(mut view) = self.ctx.views.remove(&(*window_id, *view_id)) {
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callback(
view.as_any_mut(),
payload.as_ref(),
self,
*window_id,
*view_id,
);
self.ctx.views.insert((*window_id, *view_id), view);
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true
} else {
false
}
}
};
if alive {
self.subscriptions
.entry(entity_id)
.or_default()
.push(subscription);
}
}
}
}
fn notify_model_observers(&mut self, observed_id: usize) {
if let Some(observations) = self.model_observations.remove(&observed_id) {
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if self.ctx.models.contains_key(&observed_id) {
for mut observation in observations {
let alive = match &mut observation {
ModelObservation::FromModel { model_id, callback } => {
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if let Some(mut model) = self.ctx.models.remove(model_id) {
callback(model.as_any_mut(), observed_id, self, *model_id);
self.ctx.models.insert(*model_id, model);
true
} else {
false
}
}
ModelObservation::FromView {
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window_id,
view_id,
callback,
} => {
if let Some(mut view) = self.ctx.views.remove(&(*window_id, *view_id)) {
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callback(
view.as_any_mut(),
observed_id,
self,
*window_id,
*view_id,
);
self.ctx.views.insert((*window_id, *view_id), view);
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true
} else {
false
}
}
};
if alive {
self.model_observations
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.entry(observed_id)
.or_default()
.push(observation);
}
}
}
}
}
fn notify_view_observers(&mut self, window_id: usize, view_id: usize) {
if let Some(window) = self.ctx.windows.get_mut(&window_id) {
window
.invalidation
.get_or_insert_with(Default::default)
.updated
.insert(view_id);
}
if let Some(observations) = self.view_observations.remove(&view_id) {
if self.ctx.views.contains_key(&(window_id, view_id)) {
for mut observation in observations {
let alive = if let Some(mut view) = self
.ctx
.views
.remove(&(observation.window_id, observation.view_id))
{
(observation.callback)(
view.as_any_mut(),
view_id,
window_id,
self,
observation.window_id,
observation.view_id,
);
self.ctx
.views
.insert((observation.window_id, observation.view_id), view);
true
} else {
false
};
if alive {
self.view_observations
.entry(view_id)
.or_default()
.push(observation);
}
}
}
}
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}
fn focus(&mut self, window_id: usize, focused_id: usize) {
if self
.ctx
.windows
.get(&window_id)
.map(|w| w.focused_view_id)
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.map_or(false, |cur_focused| cur_focused == focused_id)
{
return;
}
self.pending_flushes += 1;
let blurred_id = self.ctx.windows.get_mut(&window_id).map(|window| {
let blurred_id = window.focused_view_id;
window.focused_view_id = focused_id;
blurred_id
});
if let Some(blurred_id) = blurred_id {
if let Some(mut blurred_view) = self.ctx.views.remove(&(window_id, blurred_id)) {
blurred_view.on_blur(self, window_id, blurred_id);
self.ctx.views.insert((window_id, blurred_id), blurred_view);
}
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}
if let Some(mut focused_view) = self.ctx.views.remove(&(window_id, focused_id)) {
focused_view.on_focus(self, window_id, focused_id);
self.ctx.views.insert((window_id, focused_id), focused_view);
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}
self.flush_effects();
}
fn spawn<F, T>(&mut self, spawner: Spawner, future: F) -> EntityTask<T>
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where
F: 'static + Future,
T: 'static,
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{
let task_id = post_inc(&mut self.next_task_id);
let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
let task = {
let app = app.clone();
self.foreground.spawn(async move {
let output = future.await;
app.borrow_mut()
.handle_future_output(task_id, Box::new(output))
.map(|output| *output.downcast::<T>().unwrap())
})
};
EntityTask::new(
task_id,
task,
spawner,
TaskHandlerMap::Future(self.future_handlers.clone()),
)
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}
fn spawn_stream<F, T>(&mut self, spawner: Spawner, mut stream: F) -> EntityTask<T>
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where
F: 'static + Stream + Unpin,
T: 'static,
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{
let task_id = post_inc(&mut self.next_task_id);
let app = self.weak_self.as_ref().unwrap().upgrade().unwrap();
let task = self.foreground.spawn(async move {
loop {
match stream.next().await {
Some(item) => {
let mut app = app.borrow_mut();
if app.handle_stream_item(task_id, Box::new(item)) {
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break;
}
}
None => {
break;
}
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}
}
app.borrow_mut()
.stream_completed(task_id)
.map(|output| *output.downcast::<T>().unwrap())
});
EntityTask::new(
task_id,
task,
spawner,
TaskHandlerMap::Stream(self.stream_handlers.clone()),
)
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}
fn handle_future_output(
&mut self,
task_id: usize,
output: Box<dyn Any>,
) -> Option<Box<dyn Any>> {
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self.pending_flushes += 1;
let future_callback = self.future_handlers.borrow_mut().remove(&task_id).unwrap();
let result = future_callback(output, self);
self.flush_effects();
result
}
fn handle_stream_item(&mut self, task_id: usize, output: Box<dyn Any>) -> bool {
self.pending_flushes += 1;
let mut handler = self.stream_handlers.borrow_mut().remove(&task_id).unwrap();
let halt = (handler.item_callback)(output, self);
self.stream_handlers.borrow_mut().insert(task_id, handler);
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self.flush_effects();
halt
}
fn stream_completed(&mut self, task_id: usize) -> Option<Box<dyn Any>> {
self.pending_flushes += 1;
let handler = self.stream_handlers.borrow_mut().remove(&task_id).unwrap();
let result = (handler.done_callback)(self);
self.flush_effects();
result
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}
pub fn write_to_clipboard(&self, item: ClipboardItem) {
self.platform.write_to_clipboard(item);
}
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pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {
self.platform.read_from_clipboard()
}
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}
impl ReadModel for MutableAppContext {
fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
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if let Some(model) = self.ctx.models.get(&handle.model_id) {
model
.as_any()
.downcast_ref()
.expect("downcast is type safe")
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} else {
panic!("circular model reference");
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}
}
}
impl UpdateModel for MutableAppContext {
fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
where
T: Entity,
F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
{
if let Some(mut model) = self.ctx.models.remove(&handle.model_id) {
self.pending_flushes += 1;
let mut ctx = ModelContext::new(self, handle.model_id);
let result = update(
model
.as_any_mut()
.downcast_mut()
.expect("downcast is type safe"),
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&mut ctx,
);
self.ctx.models.insert(handle.model_id, model);
self.flush_effects();
result
} else {
panic!("circular model update");
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}
}
}
impl ReadView for MutableAppContext {
fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
if let Some(view) = self.ctx.views.get(&(handle.window_id, handle.view_id)) {
view.as_any().downcast_ref().expect("downcast is type safe")
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} else {
panic!("circular view reference");
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}
}
}
impl UpdateView for MutableAppContext {
fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
where
T: View,
F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
{
self.pending_flushes += 1;
let mut view = self
.ctx
.views
.remove(&(handle.window_id, handle.view_id))
.expect("circular view update");
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let mut ctx = ViewContext::new(self, handle.window_id, handle.view_id);
let result = update(
view.as_any_mut()
.downcast_mut()
.expect("downcast is type safe"),
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&mut ctx,
);
self.ctx
.views
.insert((handle.window_id, handle.view_id), view);
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self.flush_effects();
result
}
}
impl AsRef<AppContext> for MutableAppContext {
fn as_ref(&self) -> &AppContext {
&self.ctx
}
}
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pub struct AppContext {
models: HashMap<usize, Box<dyn AnyModel>>,
views: HashMap<(usize, usize), Box<dyn AnyView>>,
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windows: HashMap<usize, Window>,
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values: RwLock<HashMap<(TypeId, usize), Box<dyn Any>>>,
background: Arc<executor::Background>,
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ref_counts: Arc<Mutex<RefCounts>>,
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thread_pool: scoped_pool::Pool,
font_cache: Arc<FontCache>,
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}
impl AppContext {
pub fn root_view_id(&self, window_id: usize) -> Option<usize> {
self.windows
.get(&window_id)
.map(|window| window.root_view.id())
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}
pub fn focused_view_id(&self, window_id: usize) -> Option<usize> {
self.windows
.get(&window_id)
.map(|window| window.focused_view_id)
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}
pub fn render_view(&self, window_id: usize, view_id: usize) -> Result<ElementBox> {
self.views
.get(&(window_id, view_id))
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.map(|v| v.render(self))
.ok_or(anyhow!("view not found"))
}
pub fn render_views(&self, window_id: usize) -> HashMap<usize, ElementBox> {
self.views
.iter()
.filter_map(|((win_id, view_id), view)| {
if *win_id == window_id {
Some((*view_id, view.render(self)))
} else {
None
}
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})
.collect::<HashMap<_, ElementBox>>()
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}
pub fn background_executor(&self) -> &Arc<executor::Background> {
&self.background
}
pub fn font_cache(&self) -> &FontCache {
&self.font_cache
}
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pub fn thread_pool(&self) -> &scoped_pool::Pool {
&self.thread_pool
}
pub fn value<Tag: 'static, T: 'static + Default>(&self, id: usize) -> ValueHandle<T> {
let key = (TypeId::of::<Tag>(), id);
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let mut values = self.values.write();
values.entry(key).or_insert_with(|| Box::new(T::default()));
ValueHandle::new(TypeId::of::<Tag>(), id, &self.ref_counts)
}
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}
impl ReadModel for AppContext {
fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
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if let Some(model) = self.models.get(&handle.model_id) {
model
.as_any()
.downcast_ref()
.expect("downcast should be type safe")
} else {
panic!("circular model reference");
}
}
}
impl ReadView for AppContext {
fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
if let Some(view) = self.views.get(&(handle.window_id, handle.view_id)) {
view.as_any()
.downcast_ref()
.expect("downcast should be type safe")
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} else {
panic!("circular view reference");
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}
}
}
struct Window {
root_view: AnyViewHandle,
focused_view_id: usize,
invalidation: Option<WindowInvalidation>,
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}
#[derive(Default, Clone)]
pub struct WindowInvalidation {
pub updated: HashSet<usize>,
pub removed: Vec<usize>,
}
pub enum Effect {
Event {
entity_id: usize,
payload: Box<dyn Any>,
},
ModelNotification {
model_id: usize,
},
ViewNotification {
window_id: usize,
view_id: usize,
},
Focus {
window_id: usize,
view_id: usize,
},
}
pub trait AnyModel: Send + Sync {
fn as_any(&self) -> &dyn Any;
fn as_any_mut(&mut self) -> &mut dyn Any;
}
impl<T> AnyModel for T
where
T: Entity,
{
fn as_any(&self) -> &dyn Any {
self
}
fn as_any_mut(&mut self) -> &mut dyn Any {
self
}
}
pub trait AnyView: Send + Sync {
fn as_any(&self) -> &dyn Any;
fn as_any_mut(&mut self) -> &mut dyn Any;
fn ui_name(&self) -> &'static str;
fn render<'a>(&self, app: &AppContext) -> ElementBox;
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fn on_focus(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize);
fn on_blur(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize);
fn keymap_context(&self, app: &AppContext) -> keymap::Context;
}
impl<T> AnyView for T
where
T: View,
{
fn as_any(&self) -> &dyn Any {
self
}
fn as_any_mut(&mut self) -> &mut dyn Any {
self
}
fn ui_name(&self) -> &'static str {
T::ui_name()
}
fn render<'a>(&self, app: &AppContext) -> ElementBox {
View::render(self, app)
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}
fn on_focus(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize) {
let mut ctx = ViewContext::new(app, window_id, view_id);
View::on_focus(self, &mut ctx);
}
fn on_blur(&mut self, app: &mut MutableAppContext, window_id: usize, view_id: usize) {
let mut ctx = ViewContext::new(app, window_id, view_id);
View::on_blur(self, &mut ctx);
}
fn keymap_context(&self, app: &AppContext) -> keymap::Context {
View::keymap_context(self, app)
}
}
pub struct ModelContext<'a, T: ?Sized> {
app: &'a mut MutableAppContext,
model_id: usize,
model_type: PhantomData<T>,
halt_stream: bool,
}
impl<'a, T: Entity> ModelContext<'a, T> {
fn new(app: &'a mut MutableAppContext, model_id: usize) -> Self {
Self {
app,
model_id,
model_type: PhantomData,
halt_stream: false,
}
}
pub fn background_executor(&self) -> &Arc<executor::Background> {
&self.app.ctx.background
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}
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pub fn thread_pool(&self) -> &scoped_pool::Pool {
&self.app.ctx.thread_pool
}
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pub fn halt_stream(&mut self) {
self.halt_stream = true;
}
pub fn model_id(&self) -> usize {
self.model_id
}
pub fn add_model<S, F>(&mut self, build_model: F) -> ModelHandle<S>
where
S: Entity,
F: FnOnce(&mut ModelContext<S>) -> S,
{
self.app.add_model(build_model)
}
pub fn subscribe<S: Entity, F>(&mut self, handle: &ModelHandle<S>, mut callback: F)
where
S::Event: 'static,
F: 'static + FnMut(&mut T, &S::Event, &mut ModelContext<T>),
{
self.app
.subscriptions
.entry(handle.model_id)
.or_default()
.push(Subscription::FromModel {
model_id: self.model_id,
callback: Box::new(move |model, payload, app, model_id| {
let model = model.downcast_mut().expect("downcast is type safe");
let payload = payload.downcast_ref().expect("downcast is type safe");
let mut ctx = ModelContext::new(app, model_id);
callback(model, payload, &mut ctx);
}),
});
}
pub fn emit(&mut self, payload: T::Event) {
self.app.pending_effects.push_back(Effect::Event {
entity_id: self.model_id,
payload: Box::new(payload),
});
}
pub fn observe<S, F>(&mut self, handle: &ModelHandle<S>, mut callback: F)
where
S: Entity,
F: 'static + FnMut(&mut T, ModelHandle<S>, &mut ModelContext<T>),
{
self.app
.model_observations
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.entry(handle.model_id)
.or_default()
.push(ModelObservation::FromModel {
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model_id: self.model_id,
callback: Box::new(move |model, observed_id, app, model_id| {
let model = model.downcast_mut().expect("downcast is type safe");
let observed = ModelHandle::new(observed_id, &app.ctx.ref_counts);
let mut ctx = ModelContext::new(app, model_id);
callback(model, observed, &mut ctx);
}),
});
}
pub fn notify(&mut self) {
self.app
.pending_effects
.push_back(Effect::ModelNotification {
model_id: self.model_id,
});
}
pub fn handle(&self) -> ModelHandle<T> {
ModelHandle::new(self.model_id, &self.app.ctx.ref_counts)
}
pub fn spawn<S, F, U>(&mut self, future: S, callback: F) -> EntityTask<U>
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where
S: 'static + Future,
F: 'static + FnOnce(&mut T, S::Output, &mut ModelContext<T>) -> U,
U: 'static,
{
let handle = self.handle();
let weak_handle = handle.downgrade();
let task = self
.app
.spawn::<S, U>(Spawner::Model(handle.into()), future);
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self.app.future_handlers.borrow_mut().insert(
task.id,
Box::new(move |output, ctx| {
weak_handle.upgrade(ctx.as_ref()).map(|handle| {
let output = *output.downcast().unwrap();
handle.update(ctx, |model, ctx| {
Box::new(callback(model, output, ctx)) as Box<dyn Any>
})
})
}),
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);
task
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}
pub fn spawn_stream<S, F, G, U>(
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&mut self,
stream: S,
mut item_callback: F,
done_callback: G,
) -> EntityTask<U>
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where
S: 'static + Stream + Unpin,
F: 'static + FnMut(&mut T, S::Item, &mut ModelContext<T>),
G: 'static + FnOnce(&mut T, &mut ModelContext<T>) -> U,
U: 'static + Any,
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{
let handle = self.handle();
let weak_handle = handle.downgrade();
let task = self.app.spawn_stream(Spawner::Model(handle.into()), stream);
self.app.stream_handlers.borrow_mut().insert(
task.id,
StreamHandler {
item_callback: {
let weak_handle = weak_handle.clone();
Box::new(move |output, app| {
if let Some(handle) = weak_handle.upgrade(app.as_ref()) {
let output = *output.downcast().unwrap();
handle.update(app, |model, ctx| {
item_callback(model, output, ctx);
ctx.halt_stream
})
} else {
true
}
})
},
done_callback: Box::new(move |app| {
weak_handle.upgrade(app.as_ref()).map(|handle| {
handle.update(app, |model, ctx| Box::new(done_callback(model, ctx)))
as Box<dyn Any>
})
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}),
},
);
task
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}
}
impl<M> AsRef<AppContext> for ModelContext<'_, M> {
fn as_ref(&self) -> &AppContext {
&self.app.ctx
}
}
impl<M> AsMut<MutableAppContext> for ModelContext<'_, M> {
fn as_mut(&mut self) -> &mut MutableAppContext {
self.app
}
}
impl<M> ReadModel for ModelContext<'_, M> {
fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
self.app.read_model(handle)
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}
}
impl<M> UpdateModel for ModelContext<'_, M> {
fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
where
T: Entity,
F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
{
self.app.update_model(handle, update)
}
}
pub struct ViewContext<'a, T: ?Sized> {
app: &'a mut MutableAppContext,
window_id: usize,
view_id: usize,
view_type: PhantomData<T>,
halt_action_dispatch: bool,
halt_stream: bool,
}
impl<'a, T: View> ViewContext<'a, T> {
fn new(app: &'a mut MutableAppContext, window_id: usize, view_id: usize) -> Self {
Self {
app,
window_id,
view_id,
view_type: PhantomData,
halt_action_dispatch: true,
halt_stream: false,
}
}
pub fn handle(&self) -> ViewHandle<T> {
ViewHandle::new(self.window_id, self.view_id, &self.app.ctx.ref_counts)
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}
pub fn window_id(&self) -> usize {
self.window_id
}
pub fn view_id(&self) -> usize {
self.view_id
}
pub fn foreground(&self) -> &Rc<executor::Foreground> {
self.app.foreground_executor()
}
pub fn background_executor(&self) -> &Arc<executor::Background> {
&self.app.ctx.background
}
pub fn prompt_for_paths<F>(&self, options: PathPromptOptions, done_fn: F)
where
F: 'static + FnOnce(Option<Vec<PathBuf>>, &mut MutableAppContext),
{
self.app.prompt_for_paths(options, done_fn)
}
pub fn prompt_for_new_path<F>(&self, directory: &Path, done_fn: F)
where
F: 'static + FnOnce(Option<PathBuf>, &mut MutableAppContext),
{
self.app.prompt_for_new_path(directory, done_fn)
}
pub fn debug_elements(&self) -> crate::json::Value {
self.app.debug_elements(self.window_id).unwrap()
}
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pub fn focus<S>(&mut self, handle: S)
where
S: Into<AnyViewHandle>,
{
let handle = handle.into();
self.app.pending_effects.push_back(Effect::Focus {
window_id: handle.window_id,
view_id: handle.view_id,
});
}
pub fn focus_self(&mut self) {
self.app.pending_effects.push_back(Effect::Focus {
window_id: self.window_id,
view_id: self.view_id,
});
}
pub fn add_model<S, F>(&mut self, build_model: F) -> ModelHandle<S>
where
S: Entity,
F: FnOnce(&mut ModelContext<S>) -> S,
{
self.app.add_model(build_model)
}
pub fn add_view<S, F>(&mut self, build_view: F) -> ViewHandle<S>
where
S: View,
F: FnOnce(&mut ViewContext<S>) -> S,
{
self.app.add_view(self.window_id, build_view)
}
pub fn add_option_view<S, F>(&mut self, build_view: F) -> Option<ViewHandle<S>>
where
S: View,
F: FnOnce(&mut ViewContext<S>) -> Option<S>,
{
self.app.add_option_view(self.window_id, build_view)
}
pub fn subscribe_to_model<E, F>(&mut self, handle: &ModelHandle<E>, mut callback: F)
where
E: Entity,
E::Event: 'static,
F: 'static + FnMut(&mut T, ModelHandle<E>, &E::Event, &mut ViewContext<T>),
{
let emitter_handle = handle.downgrade();
self.subscribe(handle, move |model, payload, ctx| {
if let Some(emitter_handle) = emitter_handle.upgrade(ctx.as_ref()) {
callback(model, emitter_handle, payload, ctx);
}
});
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}
pub fn subscribe_to_view<V, F>(&mut self, handle: &ViewHandle<V>, mut callback: F)
where
V: View,
V::Event: 'static,
F: 'static + FnMut(&mut T, ViewHandle<V>, &V::Event, &mut ViewContext<T>),
{
let emitter_handle = handle.downgrade();
self.subscribe(handle, move |view, payload, ctx| {
if let Some(emitter_handle) = emitter_handle.upgrade(ctx.as_ref()) {
callback(view, emitter_handle, payload, ctx);
}
});
}
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pub fn subscribe<E, F>(&mut self, handle: &impl Handle<E>, mut callback: F)
where
E: Entity,
E::Event: 'static,
F: 'static + FnMut(&mut T, &E::Event, &mut ViewContext<T>),
{
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self.app
.subscriptions
.entry(handle.id())
.or_default()
.push(Subscription::FromView {
window_id: self.window_id,
view_id: self.view_id,
callback: Box::new(move |entity, payload, app, window_id, view_id| {
let entity = entity.downcast_mut().expect("downcast is type safe");
let payload = payload.downcast_ref().expect("downcast is type safe");
let mut ctx = ViewContext::new(app, window_id, view_id);
callback(entity, payload, &mut ctx);
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}),
});
}
pub fn emit(&mut self, payload: T::Event) {
self.app.pending_effects.push_back(Effect::Event {
entity_id: self.view_id,
payload: Box::new(payload),
});
}
pub fn observe_model<S, F>(&mut self, handle: &ModelHandle<S>, mut callback: F)
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where
S: Entity,
F: 'static + FnMut(&mut T, ModelHandle<S>, &mut ViewContext<T>),
{
self.app
.model_observations
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.entry(handle.id())
.or_default()
.push(ModelObservation::FromView {
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window_id: self.window_id,
view_id: self.view_id,
callback: Box::new(move |view, observed_id, app, window_id, view_id| {
let view = view.downcast_mut().expect("downcast is type safe");
let observed = ModelHandle::new(observed_id, &app.ctx.ref_counts);
let mut ctx = ViewContext::new(app, window_id, view_id);
callback(view, observed, &mut ctx);
}),
});
}
pub fn observe_view<S, F>(&mut self, handle: &ViewHandle<S>, mut callback: F)
where
S: View,
F: 'static + FnMut(&mut T, ViewHandle<S>, &mut ViewContext<T>),
{
self.app
.view_observations
.entry(handle.id())
.or_default()
.push(ViewObservation {
window_id: self.window_id,
view_id: self.view_id,
callback: Box::new(
move |view,
observed_view_id,
observed_window_id,
app,
observing_window_id,
observing_view_id| {
let view = view.downcast_mut().expect("downcast is type safe");
let observed_handle = ViewHandle::new(
observed_view_id,
observed_window_id,
&app.ctx.ref_counts,
);
let mut ctx = ViewContext::new(app, observing_window_id, observing_view_id);
callback(view, observed_handle, &mut ctx);
},
),
});
}
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pub fn notify(&mut self) {
self.app.notify_view(self.window_id, self.view_id);
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}
pub fn propagate_action(&mut self) {
self.halt_action_dispatch = false;
}
pub fn halt_stream(&mut self) {
self.halt_stream = true;
}
pub fn spawn<S, F, U>(&mut self, future: S, callback: F) -> EntityTask<U>
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where
S: 'static + Future,
F: 'static + FnOnce(&mut T, S::Output, &mut ViewContext<T>) -> U,
U: 'static,
{
let handle = self.handle();
let weak_handle = handle.downgrade();
let task = self.app.spawn(Spawner::View(handle.into()), future);
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self.app.future_handlers.borrow_mut().insert(
task.id,
Box::new(move |output, app| {
weak_handle.upgrade(app.as_ref()).map(|handle| {
let output = *output.downcast().unwrap();
handle.update(app, |view, ctx| {
Box::new(callback(view, output, ctx)) as Box<dyn Any>
})
})
}),
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);
task
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}
pub fn spawn_stream<S, F, G, U>(
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&mut self,
stream: S,
mut item_callback: F,
done_callback: G,
) -> EntityTask<U>
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where
S: 'static + Stream + Unpin,
F: 'static + FnMut(&mut T, S::Item, &mut ViewContext<T>),
G: 'static + FnOnce(&mut T, &mut ViewContext<T>) -> U,
U: 'static + Any,
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{
let handle = self.handle();
let weak_handle = handle.downgrade();
let task = self.app.spawn_stream(Spawner::View(handle.into()), stream);
self.app.stream_handlers.borrow_mut().insert(
task.id,
StreamHandler {
item_callback: {
let weak_handle = weak_handle.clone();
Box::new(move |output, ctx| {
if let Some(handle) = weak_handle.upgrade(ctx.as_ref()) {
let output = *output.downcast().unwrap();
handle.update(ctx, |view, ctx| {
item_callback(view, output, ctx);
ctx.halt_stream
})
} else {
true
}
})
},
done_callback: Box::new(move |ctx| {
weak_handle.upgrade(ctx.as_ref()).map(|handle| {
handle.update(ctx, |view, ctx| {
Box::new(done_callback(view, ctx)) as Box<dyn Any>
})
})
}),
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},
);
task
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}
}
impl AsRef<AppContext> for &AppContext {
fn as_ref(&self) -> &AppContext {
self
}
}
impl<M> AsRef<AppContext> for ViewContext<'_, M> {
fn as_ref(&self) -> &AppContext {
&self.app.ctx
}
}
impl<M> AsMut<MutableAppContext> for ViewContext<'_, M> {
fn as_mut(&mut self) -> &mut MutableAppContext {
self.app
}
}
impl<V> ReadModel for ViewContext<'_, V> {
fn read_model<T: Entity>(&self, handle: &ModelHandle<T>) -> &T {
self.app.read_model(handle)
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}
}
impl<V: View> UpdateModel for ViewContext<'_, V> {
fn update_model<T, F, S>(&mut self, handle: &ModelHandle<T>, update: F) -> S
where
T: Entity,
F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
{
self.app.update_model(handle, update)
}
}
impl<V: View> ReadView for ViewContext<'_, V> {
fn read_view<T: View>(&self, handle: &ViewHandle<T>) -> &T {
self.app.read_view(handle)
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}
}
impl<V: View> UpdateView for ViewContext<'_, V> {
fn update_view<T, F, S>(&mut self, handle: &ViewHandle<T>, update: F) -> S
where
T: View,
F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
{
self.app.update_view(handle, update)
}
}
pub trait Handle<T> {
fn id(&self) -> usize;
fn location(&self) -> EntityLocation;
}
#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
pub enum EntityLocation {
Model(usize),
View(usize, usize),
}
pub struct ModelHandle<T> {
model_id: usize,
model_type: PhantomData<T>,
ref_counts: Arc<Mutex<RefCounts>>,
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}
impl<T: Entity> ModelHandle<T> {
fn new(model_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
ref_counts.lock().inc_entity(model_id);
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Self {
model_id,
model_type: PhantomData,
ref_counts: ref_counts.clone(),
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}
}
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pub fn downgrade(&self) -> WeakModelHandle<T> {
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WeakModelHandle::new(self.model_id)
}
pub fn id(&self) -> usize {
self.model_id
}
pub fn read<'a, A: ReadModel>(&self, app: &'a A) -> &'a T {
app.read_model(self)
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}
pub fn update<A, F, S>(&self, app: &mut A, update: F) -> S
where
A: UpdateModel,
F: FnOnce(&mut T, &mut ModelContext<T>) -> S,
{
app.update_model(self, update)
}
pub fn condition(
&self,
ctx: &TestAppContext,
predicate: impl FnMut(&T, &AppContext) -> bool,
) -> impl Future<Output = ()> {
self.condition_with_duration(Duration::from_millis(100), ctx, predicate)
}
pub fn condition_with_duration(
&self,
duration: Duration,
ctx: &TestAppContext,
mut predicate: impl FnMut(&T, &AppContext) -> bool,
) -> impl Future<Output = ()> {
let (tx, mut rx) = mpsc::channel(1024);
let mut ctx = ctx.0.borrow_mut();
self.update(&mut *ctx, |_, ctx| {
ctx.observe(self, {
let mut tx = tx.clone();
move |_, _, _| {
tx.blocking_send(()).ok();
}
});
ctx.subscribe(self, {
let mut tx = tx.clone();
move |_, _, _| {
tx.blocking_send(()).ok();
}
})
});
let ctx = ctx.weak_self.as_ref().unwrap().upgrade().unwrap();
let handle = self.downgrade();
async move {
timeout(duration, async move {
loop {
{
let ctx = ctx.borrow();
let ctx = ctx.as_ref();
if predicate(
handle
.upgrade(ctx)
.expect("model dropped with pending condition")
.read(ctx),
ctx,
) {
break;
}
}
rx.recv()
.await
.expect("model dropped with pending condition");
}
})
.await
.expect("condition timed out");
}
}
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}
impl<T> Clone for ModelHandle<T> {
fn clone(&self) -> Self {
self.ref_counts.lock().inc_entity(self.model_id);
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Self {
model_id: self.model_id,
model_type: PhantomData,
ref_counts: self.ref_counts.clone(),
}
}
}
impl<T> PartialEq for ModelHandle<T> {
fn eq(&self, other: &Self) -> bool {
self.model_id == other.model_id
}
}
impl<T> Eq for ModelHandle<T> {}
impl<T> Hash for ModelHandle<T> {
fn hash<H: Hasher>(&self, state: &mut H) {
self.model_id.hash(state);
}
}
impl<T> std::borrow::Borrow<usize> for ModelHandle<T> {
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fn borrow(&self) -> &usize {
&self.model_id
}
}
impl<T> Debug for ModelHandle<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple(&format!("ModelHandle<{}>", type_name::<T>()))
.field(&self.model_id)
.finish()
}
}
unsafe impl<T> Send for ModelHandle<T> {}
unsafe impl<T> Sync for ModelHandle<T> {}
impl<T> Drop for ModelHandle<T> {
fn drop(&mut self) {
self.ref_counts.lock().dec_model(self.model_id);
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}
}
impl<T> Handle<T> for ModelHandle<T> {
fn id(&self) -> usize {
self.model_id
}
fn location(&self) -> EntityLocation {
EntityLocation::Model(self.model_id)
}
}
pub struct WeakModelHandle<T> {
model_id: usize,
model_type: PhantomData<T>,
}
impl<T: Entity> WeakModelHandle<T> {
fn new(model_id: usize) -> Self {
Self {
model_id,
model_type: PhantomData,
}
}
pub fn upgrade(&self, app: &AppContext) -> Option<ModelHandle<T>> {
if app.models.contains_key(&self.model_id) {
Some(ModelHandle::new(self.model_id, &app.ref_counts))
} else {
None
}
}
}
impl<T> Clone for WeakModelHandle<T> {
fn clone(&self) -> Self {
Self {
model_id: self.model_id,
model_type: PhantomData,
}
}
}
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pub struct ViewHandle<T> {
window_id: usize,
view_id: usize,
view_type: PhantomData<T>,
ref_counts: Arc<Mutex<RefCounts>>,
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}
impl<T: View> ViewHandle<T> {
fn new(window_id: usize, view_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
ref_counts.lock().inc_entity(view_id);
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Self {
window_id,
view_id,
view_type: PhantomData,
ref_counts: ref_counts.clone(),
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}
}
pub fn downgrade(&self) -> WeakViewHandle<T> {
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WeakViewHandle::new(self.window_id, self.view_id)
}
pub fn window_id(&self) -> usize {
self.window_id
}
pub fn id(&self) -> usize {
self.view_id
}
pub fn read<'a, A: ReadView>(&self, app: &'a A) -> &'a T {
app.read_view(self)
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}
pub fn update<A, F, S>(&self, app: &mut A, update: F) -> S
where
A: UpdateView,
F: FnOnce(&mut T, &mut ViewContext<T>) -> S,
{
app.update_view(self, update)
}
pub fn is_focused(&self, app: &AppContext) -> bool {
app.focused_view_id(self.window_id)
.map_or(false, |focused_id| focused_id == self.view_id)
}
pub fn condition(
&self,
ctx: &TestAppContext,
predicate: impl FnMut(&T, &AppContext) -> bool,
) -> impl Future<Output = ()> {
self.condition_with_duration(Duration::from_millis(500), ctx, predicate)
}
pub fn condition_with_duration(
&self,
duration: Duration,
ctx: &TestAppContext,
mut predicate: impl FnMut(&T, &AppContext) -> bool,
) -> impl Future<Output = ()> {
let (tx, mut rx) = mpsc::channel(1024);
let mut ctx = ctx.0.borrow_mut();
self.update(&mut *ctx, |_, ctx| {
ctx.observe_view(self, {
let mut tx = tx.clone();
move |_, _, _| {
tx.blocking_send(()).ok();
}
});
ctx.subscribe(self, {
let mut tx = tx.clone();
move |_, _, _| {
tx.blocking_send(()).ok();
}
})
});
let ctx = ctx.weak_self.as_ref().unwrap().upgrade().unwrap();
let handle = self.downgrade();
async move {
timeout(duration, async move {
loop {
{
let ctx = ctx.borrow();
let ctx = ctx.as_ref();
if predicate(
handle
.upgrade(ctx)
.expect("view dropped with pending condition")
.read(ctx),
ctx,
) {
break;
}
}
rx.recv()
.await
.expect("view dropped with pending condition");
}
})
.await
.expect("condition timed out");
}
}
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}
impl<T> Clone for ViewHandle<T> {
fn clone(&self) -> Self {
self.ref_counts.lock().inc_entity(self.view_id);
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Self {
window_id: self.window_id,
view_id: self.view_id,
view_type: PhantomData,
ref_counts: self.ref_counts.clone(),
}
}
}
impl<T> PartialEq for ViewHandle<T> {
fn eq(&self, other: &Self) -> bool {
self.window_id == other.window_id && self.view_id == other.view_id
}
}
impl<T> Eq for ViewHandle<T> {}
impl<T> Debug for ViewHandle<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct(&format!("ViewHandle<{}>", type_name::<T>()))
.field("window_id", &self.window_id)
.field("view_id", &self.view_id)
.finish()
}
}
impl<T> Drop for ViewHandle<T> {
fn drop(&mut self) {
self.ref_counts
.lock()
.dec_view(self.window_id, self.view_id);
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}
}
impl<T> Handle<T> for ViewHandle<T> {
fn id(&self) -> usize {
self.view_id
}
fn location(&self) -> EntityLocation {
EntityLocation::View(self.window_id, self.view_id)
}
}
pub struct AnyViewHandle {
window_id: usize,
view_id: usize,
view_type: TypeId,
ref_counts: Arc<Mutex<RefCounts>>,
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}
impl AnyViewHandle {
pub fn id(&self) -> usize {
self.view_id
}
pub fn is<T: 'static>(&self) -> bool {
TypeId::of::<T>() == self.view_type
}
pub fn downcast<T: View>(self) -> Option<ViewHandle<T>> {
if self.is::<T>() {
let result = Some(ViewHandle {
window_id: self.window_id,
view_id: self.view_id,
ref_counts: self.ref_counts.clone(),
view_type: PhantomData,
});
unsafe {
Arc::decrement_strong_count(&self.ref_counts);
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}
std::mem::forget(self);
result
} else {
None
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}
}
}
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impl Clone for AnyViewHandle {
fn clone(&self) -> Self {
self.ref_counts.lock().inc_entity(self.view_id);
Self {
window_id: self.window_id,
view_id: self.view_id,
view_type: self.view_type,
ref_counts: self.ref_counts.clone(),
}
}
}
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impl<T: View> From<&ViewHandle<T>> for AnyViewHandle {
fn from(handle: &ViewHandle<T>) -> Self {
handle.ref_counts.lock().inc_entity(handle.view_id);
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AnyViewHandle {
window_id: handle.window_id,
view_id: handle.view_id,
view_type: TypeId::of::<T>(),
ref_counts: handle.ref_counts.clone(),
}
}
}
impl<T: View> From<ViewHandle<T>> for AnyViewHandle {
fn from(handle: ViewHandle<T>) -> Self {
let any_handle = AnyViewHandle {
window_id: handle.window_id,
view_id: handle.view_id,
view_type: TypeId::of::<T>(),
ref_counts: handle.ref_counts.clone(),
};
unsafe {
Arc::decrement_strong_count(&handle.ref_counts);
}
std::mem::forget(handle);
any_handle
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}
}
impl Drop for AnyViewHandle {
fn drop(&mut self) {
self.ref_counts
.lock()
.dec_view(self.window_id, self.view_id);
}
}
pub struct AnyModelHandle {
model_id: usize,
ref_counts: Arc<Mutex<RefCounts>>,
}
impl<T: Entity> From<ModelHandle<T>> for AnyModelHandle {
fn from(handle: ModelHandle<T>) -> Self {
handle.ref_counts.lock().inc_entity(handle.model_id);
Self {
model_id: handle.model_id,
ref_counts: handle.ref_counts.clone(),
}
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}
}
impl Drop for AnyModelHandle {
fn drop(&mut self) {
self.ref_counts.lock().dec_model(self.model_id);
}
}
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pub struct WeakViewHandle<T> {
window_id: usize,
view_id: usize,
view_type: PhantomData<T>,
}
impl<T: View> WeakViewHandle<T> {
fn new(window_id: usize, view_id: usize) -> Self {
Self {
window_id,
view_id,
view_type: PhantomData,
}
}
pub fn upgrade(&self, ctx: impl AsRef<AppContext>) -> Option<ViewHandle<T>> {
let ctx = ctx.as_ref();
if ctx.ref_counts.lock().is_entity_alive(self.view_id) {
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Some(ViewHandle::new(
self.window_id,
self.view_id,
&ctx.ref_counts,
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))
} else {
None
}
}
}
impl<T> Clone for WeakViewHandle<T> {
fn clone(&self) -> Self {
Self {
window_id: self.window_id,
view_id: self.view_id,
view_type: PhantomData,
}
}
}
pub struct ValueHandle<T> {
value_type: PhantomData<T>,
tag_type_id: TypeId,
id: usize,
ref_counts: Weak<Mutex<RefCounts>>,
}
impl<T: 'static> ValueHandle<T> {
fn new(tag_type_id: TypeId, id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
ref_counts.lock().inc_value(tag_type_id, id);
Self {
value_type: PhantomData,
tag_type_id,
id,
ref_counts: Arc::downgrade(ref_counts),
}
}
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pub fn read<R>(&self, ctx: &AppContext, f: impl FnOnce(&T) -> R) -> R {
f(ctx
.values
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.read()
.get(&(self.tag_type_id, self.id))
.unwrap()
.downcast_ref()
.unwrap())
}
pub fn update<R>(&self, ctx: &AppContext, f: impl FnOnce(&mut T) -> R) -> R {
f(ctx
.values
.write()
.get_mut(&(self.tag_type_id, self.id))
.unwrap()
.downcast_mut()
.unwrap())
}
}
impl<T> Drop for ValueHandle<T> {
fn drop(&mut self) {
if let Some(ref_counts) = self.ref_counts.upgrade() {
ref_counts.lock().dec_value(self.tag_type_id, self.id);
}
}
}
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#[derive(Default)]
struct RefCounts {
entity_counts: HashMap<usize, usize>,
value_counts: HashMap<(TypeId, usize), usize>,
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dropped_models: HashSet<usize>,
dropped_views: HashSet<(usize, usize)>,
dropped_values: HashSet<(TypeId, usize)>,
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}
impl RefCounts {
fn inc_entity(&mut self, entity_id: usize) {
*self.entity_counts.entry(entity_id).or_insert(0) += 1;
}
fn inc_value(&mut self, tag_type_id: TypeId, id: usize) {
*self.value_counts.entry((tag_type_id, id)).or_insert(0) += 1;
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}
fn dec_model(&mut self, model_id: usize) {
let count = self.entity_counts.get_mut(&model_id).unwrap();
*count -= 1;
if *count == 0 {
self.entity_counts.remove(&model_id);
self.dropped_models.insert(model_id);
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}
}
fn dec_view(&mut self, window_id: usize, view_id: usize) {
let count = self.entity_counts.get_mut(&view_id).unwrap();
*count -= 1;
if *count == 0 {
self.entity_counts.remove(&view_id);
self.dropped_views.insert((window_id, view_id));
}
}
fn dec_value(&mut self, tag_type_id: TypeId, id: usize) {
let key = (tag_type_id, id);
let count = self.value_counts.get_mut(&key).unwrap();
*count -= 1;
if *count == 0 {
self.value_counts.remove(&key);
self.dropped_values.insert(key);
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}
}
fn is_entity_alive(&self, entity_id: usize) -> bool {
self.entity_counts.contains_key(&entity_id)
}
fn take_dropped(
&mut self,
) -> (
HashSet<usize>,
HashSet<(usize, usize)>,
HashSet<(TypeId, usize)>,
) {
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let mut dropped_models = HashSet::new();
let mut dropped_views = HashSet::new();
let mut dropped_values = HashSet::new();
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std::mem::swap(&mut self.dropped_models, &mut dropped_models);
std::mem::swap(&mut self.dropped_views, &mut dropped_views);
std::mem::swap(&mut self.dropped_values, &mut dropped_values);
(dropped_models, dropped_views, dropped_values)
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}
}
enum Subscription {
FromModel {
model_id: usize,
callback: Box<dyn FnMut(&mut dyn Any, &dyn Any, &mut MutableAppContext, usize)>,
},
FromView {
window_id: usize,
view_id: usize,
callback: Box<dyn FnMut(&mut dyn Any, &dyn Any, &mut MutableAppContext, usize, usize)>,
},
}
enum ModelObservation {
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FromModel {
model_id: usize,
callback: Box<dyn FnMut(&mut dyn Any, usize, &mut MutableAppContext, usize)>,
},
FromView {
window_id: usize,
view_id: usize,
callback: Box<dyn FnMut(&mut dyn Any, usize, &mut MutableAppContext, usize, usize)>,
},
}
struct ViewObservation {
window_id: usize,
view_id: usize,
callback: Box<dyn FnMut(&mut dyn Any, usize, usize, &mut MutableAppContext, usize, usize)>,
}
type FutureHandler = Box<dyn FnOnce(Box<dyn Any>, &mut MutableAppContext) -> Option<Box<dyn Any>>>;
struct StreamHandler {
item_callback: Box<dyn FnMut(Box<dyn Any>, &mut MutableAppContext) -> bool>,
done_callback: Box<dyn FnOnce(&mut MutableAppContext) -> Option<Box<dyn Any>>>,
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}
#[must_use]
pub struct EntityTask<T> {
id: usize,
task: Option<executor::Task<Option<T>>>,
_spawner: Spawner, // Keeps the spawning entity alive for as long as the task exists
handler_map: TaskHandlerMap,
}
pub enum Spawner {
Model(AnyModelHandle),
View(AnyViewHandle),
}
enum TaskHandlerMap {
Detached,
Future(Rc<RefCell<HashMap<usize, FutureHandler>>>),
Stream(Rc<RefCell<HashMap<usize, StreamHandler>>>),
}
impl<T> EntityTask<T> {
fn new(
id: usize,
task: executor::Task<Option<T>>,
spawner: Spawner,
handler_map: TaskHandlerMap,
) -> Self {
Self {
id,
task: Some(task),
_spawner: spawner,
handler_map,
}
}
pub fn detach(mut self) {
self.handler_map = TaskHandlerMap::Detached;
self.task.take().unwrap().detach();
}
pub async fn cancel(mut self) -> Option<T> {
let task = self.task.take().unwrap();
task.cancel().await.unwrap()
}
}
impl<T> Future for EntityTask<T> {
type Output = T;
fn poll(
self: std::pin::Pin<&mut Self>,
ctx: &mut std::task::Context<'_>,
) -> std::task::Poll<Self::Output> {
let task = unsafe { self.map_unchecked_mut(|task| task.task.as_mut().unwrap()) };
task.poll(ctx).map(|output| output.unwrap())
}
}
impl<T> Drop for EntityTask<T> {
fn drop(self: &mut Self) {
match &self.handler_map {
TaskHandlerMap::Detached => {
return;
}
TaskHandlerMap::Future(map) => {
map.borrow_mut().remove(&self.id);
}
TaskHandlerMap::Stream(map) => {
map.borrow_mut().remove(&self.id);
}
}
}
}
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#[cfg(test)]
mod tests {
use super::*;
use crate::elements::*;
use smol::future::poll_once;
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#[crate::test(self)]
fn test_model_handles(app: &mut MutableAppContext) {
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struct Model {
other: Option<ModelHandle<Model>>,
events: Vec<String>,
}
impl Entity for Model {
type Event = usize;
}
impl Model {
fn new(other: Option<ModelHandle<Self>>, ctx: &mut ModelContext<Self>) -> Self {
if let Some(other) = other.as_ref() {
ctx.observe(other, |me, _, _| {
me.events.push("notified".into());
});
ctx.subscribe(other, |me, event, _| {
me.events.push(format!("observed event {}", event));
});
}
Self {
other,
events: Vec::new(),
}
}
}
let handle_1 = app.add_model(|ctx| Model::new(None, ctx));
let handle_2 = app.add_model(|ctx| Model::new(Some(handle_1.clone()), ctx));
assert_eq!(app.ctx.models.len(), 2);
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handle_1.update(app, |model, ctx| {
model.events.push("updated".into());
ctx.emit(1);
ctx.notify();
ctx.emit(2);
});
assert_eq!(handle_1.read(app).events, vec!["updated".to_string()]);
assert_eq!(
handle_2.read(app).events,
vec![
"observed event 1".to_string(),
"notified".to_string(),
"observed event 2".to_string(),
]
);
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handle_2.update(app, |model, _| {
drop(handle_1);
model.other.take();
});
assert_eq!(app.ctx.models.len(), 1);
assert!(app.subscriptions.is_empty());
assert!(app.model_observations.is_empty());
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}
#[crate::test(self)]
fn test_subscribe_and_emit_from_model(app: &mut MutableAppContext) {
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#[derive(Default)]
struct Model {
events: Vec<usize>,
}
impl Entity for Model {
type Event = usize;
}
let handle_1 = app.add_model(|_| Model::default());
let handle_2 = app.add_model(|_| Model::default());
let handle_2b = handle_2.clone();
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handle_1.update(app, |_, c| {
c.subscribe(&handle_2, move |model: &mut Model, event, c| {
model.events.push(*event);
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c.subscribe(&handle_2b, |model, event, _| {
model.events.push(*event * 2);
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});
});
});
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handle_2.update(app, |_, c| c.emit(7));
assert_eq!(handle_1.read(app).events, vec![7]);
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handle_2.update(app, |_, c| c.emit(5));
assert_eq!(handle_1.read(app).events, vec![7, 10, 5]);
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}
#[crate::test(self)]
fn test_observe_and_notify_from_model(app: &mut MutableAppContext) {
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#[derive(Default)]
struct Model {
count: usize,
events: Vec<usize>,
}
impl Entity for Model {
type Event = ();
}
let handle_1 = app.add_model(|_| Model::default());
let handle_2 = app.add_model(|_| Model::default());
let handle_2b = handle_2.clone();
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handle_1.update(app, |_, c| {
c.observe(&handle_2, move |model, observed, c| {
model.events.push(observed.read(c).count);
c.observe(&handle_2b, |model, observed, c| {
model.events.push(observed.read(c).count * 2);
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});
});
});
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handle_2.update(app, |model, c| {
model.count = 7;
c.notify()
});
assert_eq!(handle_1.read(app).events, vec![7]);
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handle_2.update(app, |model, c| {
model.count = 5;
c.notify()
});
assert_eq!(handle_1.read(app).events, vec![7, 10, 5])
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}
#[crate::test(self)]
async fn test_spawn_from_model(mut app: TestAppContext) {
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#[derive(Default)]
struct Model {
count: usize,
}
impl Entity for Model {
type Event = ();
}
let handle = app.add_model(|_| Model::default());
handle
.update(&mut app, |_, c| {
c.spawn(async { 7 }, |model, output, _| {
model.count = output;
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})
})
.await;
app.read(|ctx| assert_eq!(handle.read(ctx).count, 7));
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handle
.update(&mut app, |_, c| {
c.spawn(async { 14 }, |model, output, _| {
model.count = output;
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})
})
.await;
app.read(|ctx| assert_eq!(handle.read(ctx).count, 14));
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}
#[crate::test(self)]
async fn test_spawn_stream_local_from_model(mut app: TestAppContext) {
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#[derive(Default)]
struct Model {
events: Vec<Option<usize>>,
}
impl Entity for Model {
type Event = ();
}
let handle = app.add_model(|_| Model::default());
handle
.update(&mut app, |_, c| {
c.spawn_stream(
smol::stream::iter(vec![1, 2, 3]),
|model, output, _| model.events.push(Some(output)),
|model, _| model.events.push(None),
)
})
.await;
app.read(|ctx| assert_eq!(handle.read(ctx).events, [Some(1), Some(2), Some(3), None]));
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}
#[crate::test(self)]
fn test_view_handles(app: &mut MutableAppContext) {
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struct View {
other: Option<ViewHandle<View>>,
events: Vec<String>,
}
impl Entity for View {
type Event = usize;
}
impl super::View for View {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
}
impl View {
fn new(other: Option<ViewHandle<View>>, ctx: &mut ViewContext<Self>) -> Self {
if let Some(other) = other.as_ref() {
ctx.subscribe_to_view(other, |me, _, event, _| {
me.events.push(format!("observed event {}", event));
});
}
Self {
other,
events: Vec::new(),
}
}
}
let (window_id, _) = app.add_window(|ctx| View::new(None, ctx));
let handle_1 = app.add_view(window_id, |ctx| View::new(None, ctx));
let handle_2 = app.add_view(window_id, |ctx| View::new(Some(handle_1.clone()), ctx));
assert_eq!(app.ctx.views.len(), 3);
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handle_1.update(app, |view, ctx| {
view.events.push("updated".into());
ctx.emit(1);
ctx.emit(2);
});
assert_eq!(handle_1.read(app).events, vec!["updated".to_string()]);
assert_eq!(
handle_2.read(app).events,
vec![
"observed event 1".to_string(),
"observed event 2".to_string(),
]
);
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handle_2.update(app, |view, _| {
drop(handle_1);
view.other.take();
});
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assert_eq!(app.ctx.views.len(), 2);
assert!(app.subscriptions.is_empty());
assert!(app.model_observations.is_empty());
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}
#[crate::test(self)]
fn test_subscribe_and_emit_from_view(app: &mut MutableAppContext) {
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#[derive(Default)]
struct View {
events: Vec<usize>,
}
impl Entity for View {
type Event = usize;
}
impl super::View for View {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
}
struct Model;
impl Entity for Model {
type Event = usize;
}
let (window_id, handle_1) = app.add_window(|_| View::default());
let handle_2 = app.add_view(window_id, |_| View::default());
let handle_2b = handle_2.clone();
let handle_3 = app.add_model(|_| Model);
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handle_1.update(app, |_, c| {
c.subscribe_to_view(&handle_2, move |me, _, event, c| {
me.events.push(*event);
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c.subscribe_to_view(&handle_2b, |me, _, event, _| {
me.events.push(*event * 2);
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});
});
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c.subscribe_to_model(&handle_3, |me, _, event, _| {
me.events.push(*event);
})
});
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handle_2.update(app, |_, c| c.emit(7));
assert_eq!(handle_1.read(app).events, vec![7]);
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handle_2.update(app, |_, c| c.emit(5));
assert_eq!(handle_1.read(app).events, vec![7, 10, 5]);
handle_3.update(app, |_, c| c.emit(9));
assert_eq!(handle_1.read(app).events, vec![7, 10, 5, 9]);
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}
#[crate::test(self)]
fn test_dropping_subscribers(app: &mut MutableAppContext) {
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struct View;
impl Entity for View {
type Event = ();
}
impl super::View for View {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
}
struct Model;
impl Entity for Model {
type Event = ();
}
let (window_id, _) = app.add_window(|_| View);
let observing_view = app.add_view(window_id, |_| View);
let emitting_view = app.add_view(window_id, |_| View);
let observing_model = app.add_model(|_| Model);
let observed_model = app.add_model(|_| Model);
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observing_view.update(app, |_, ctx| {
ctx.subscribe_to_view(&emitting_view, |_, _, _, _| {});
ctx.subscribe_to_model(&observed_model, |_, _, _, _| {});
});
observing_model.update(app, |_, ctx| {
ctx.subscribe(&observed_model, |_, _, _| {});
});
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app.update(|| {
drop(observing_view);
drop(observing_model);
});
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emitting_view.update(app, |_, ctx| ctx.emit(()));
observed_model.update(app, |_, ctx| ctx.emit(()));
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}
#[crate::test(self)]
fn test_observe_and_notify_from_view(app: &mut MutableAppContext) {
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#[derive(Default)]
struct View {
events: Vec<usize>,
}
impl Entity for View {
type Event = usize;
}
impl super::View for View {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
}
#[derive(Default)]
struct Model {
count: usize,
}
impl Entity for Model {
type Event = ();
}
let (_, view) = app.add_window(|_| View::default());
let model = app.add_model(|_| Model::default());
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view.update(app, |_, c| {
c.observe_model(&model, |me, observed, c| {
me.events.push(observed.read(c).count)
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});
});
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model.update(app, |model, c| {
model.count = 11;
c.notify();
});
assert_eq!(view.read(app).events, vec![11]);
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}
#[crate::test(self)]
fn test_dropping_observers(app: &mut MutableAppContext) {
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struct View;
impl Entity for View {
type Event = ();
}
impl super::View for View {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
}
struct Model;
impl Entity for Model {
type Event = ();
}
let (window_id, _) = app.add_window(|_| View);
let observing_view = app.add_view(window_id, |_| View);
let observing_model = app.add_model(|_| Model);
let observed_model = app.add_model(|_| Model);
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observing_view.update(app, |_, ctx| {
ctx.observe_model(&observed_model, |_, _, _| {});
});
observing_model.update(app, |_, ctx| {
ctx.observe(&observed_model, |_, _, _| {});
});
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app.update(|| {
drop(observing_view);
drop(observing_model);
});
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observed_model.update(app, |_, ctx| ctx.notify());
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}
#[crate::test(self)]
fn test_focus(app: &mut MutableAppContext) {
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struct View {
name: String,
events: Arc<Mutex<Vec<String>>>,
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}
impl Entity for View {
type Event = ();
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}
impl super::View for View {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
fn on_focus(&mut self, _: &mut ViewContext<Self>) {
self.events.lock().push(format!("{} focused", &self.name));
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}
fn on_blur(&mut self, _: &mut ViewContext<Self>) {
self.events.lock().push(format!("{} blurred", &self.name));
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}
}
let events: Arc<Mutex<Vec<String>>> = Default::default();
let (window_id, view_1) = app.add_window(|_| View {
events: events.clone(),
name: "view 1".to_string(),
});
let view_2 = app.add_view(window_id, |_| View {
events: events.clone(),
name: "view 2".to_string(),
});
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view_1.update(app, |_, ctx| ctx.focus(&view_2));
view_1.update(app, |_, ctx| ctx.focus(&view_1));
view_1.update(app, |_, ctx| ctx.focus(&view_2));
view_1.update(app, |_, _| drop(view_2));
assert_eq!(
*events.lock(),
[
"view 1 focused".to_string(),
"view 1 blurred".to_string(),
"view 2 focused".to_string(),
"view 2 blurred".to_string(),
"view 1 focused".to_string(),
"view 1 blurred".to_string(),
"view 2 focused".to_string(),
"view 1 focused".to_string(),
],
);
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}
#[crate::test(self)]
async fn test_spawn_from_view(mut app: TestAppContext) {
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#[derive(Default)]
struct View {
count: usize,
}
impl Entity for View {
type Event = ();
}
impl super::View for View {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
}
let handle = app.add_window(|_| View::default()).1;
handle
.update(&mut app, |_, c| {
c.spawn(async { 7 }, |me, output, _| {
me.count = output;
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})
})
.await;
app.read(|ctx| assert_eq!(handle.read(ctx).count, 7));
handle
.update(&mut app, |_, c| {
c.spawn(async { 14 }, |me, output, _| {
me.count = output;
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})
})
.await;
app.read(|ctx| assert_eq!(handle.read(ctx).count, 14));
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}
#[crate::test(self)]
async fn test_spawn_stream_local_from_view(mut app: TestAppContext) {
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#[derive(Default)]
struct View {
events: Vec<Option<usize>>,
}
impl Entity for View {
type Event = ();
}
impl super::View for View {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
}
let (_, handle) = app.add_window(|_| View::default());
handle
.update(&mut app, |_, c| {
c.spawn_stream(
smol::stream::iter(vec![1_usize, 2, 3]),
|me, output, _| {
me.events.push(Some(output));
},
|me, _| {
me.events.push(None);
},
)
})
.await;
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app.read(|ctx| assert_eq!(handle.read(ctx).events, [Some(1), Some(2), Some(3), None]))
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}
#[crate::test(self)]
fn test_dispatch_action(app: &mut MutableAppContext) {
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struct ViewA {
id: usize,
}
impl Entity for ViewA {
type Event = ();
}
impl View for ViewA {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
}
struct ViewB {
id: usize,
}
impl Entity for ViewB {
type Event = ();
}
impl View for ViewB {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
}
struct ActionArg {
foo: String,
}
let actions = Rc::new(RefCell::new(Vec::new()));
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let actions_clone = actions.clone();
app.add_global_action("action", move |_: &ActionArg, _: &mut MutableAppContext| {
actions_clone.borrow_mut().push("global a".to_string());
});
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let actions_clone = actions.clone();
app.add_global_action("action", move |_: &ActionArg, _: &mut MutableAppContext| {
actions_clone.borrow_mut().push("global b".to_string());
});
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let actions_clone = actions.clone();
app.add_action("action", move |view: &mut ViewA, arg: &ActionArg, ctx| {
assert_eq!(arg.foo, "bar");
ctx.propagate_action();
actions_clone.borrow_mut().push(format!("{} a", view.id));
});
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let actions_clone = actions.clone();
app.add_action("action", move |view: &mut ViewA, _: &ActionArg, ctx| {
if view.id != 1 {
ctx.propagate_action();
}
actions_clone.borrow_mut().push(format!("{} b", view.id));
});
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let actions_clone = actions.clone();
app.add_action("action", move |view: &mut ViewB, _: &ActionArg, ctx| {
ctx.propagate_action();
actions_clone.borrow_mut().push(format!("{} c", view.id));
});
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let actions_clone = actions.clone();
app.add_action("action", move |view: &mut ViewB, _: &ActionArg, ctx| {
ctx.propagate_action();
actions_clone.borrow_mut().push(format!("{} d", view.id));
});
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let (window_id, view_1) = app.add_window(|_| ViewA { id: 1 });
let view_2 = app.add_view(window_id, |_| ViewB { id: 2 });
let view_3 = app.add_view(window_id, |_| ViewA { id: 3 });
let view_4 = app.add_view(window_id, |_| ViewB { id: 4 });
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app.dispatch_action(
window_id,
vec![view_1.id(), view_2.id(), view_3.id(), view_4.id()],
"action",
ActionArg { foo: "bar".into() },
);
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assert_eq!(
*actions.borrow(),
vec!["4 d", "4 c", "3 b", "3 a", "2 d", "2 c", "1 b"]
);
// Remove view_1, which doesn't propagate the action
actions.borrow_mut().clear();
app.dispatch_action(
window_id,
vec![view_2.id(), view_3.id(), view_4.id()],
"action",
ActionArg { foo: "bar".into() },
);
assert_eq!(
*actions.borrow(),
vec!["4 d", "4 c", "3 b", "3 a", "2 d", "2 c", "global b", "global a"]
);
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}
#[crate::test(self)]
fn test_dispatch_keystroke(app: &mut MutableAppContext) {
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use std::cell::Cell;
#[derive(Clone)]
struct ActionArg {
key: String,
}
struct View {
id: usize,
keymap_context: keymap::Context,
}
impl Entity for View {
type Event = ();
}
impl super::View for View {
fn render<'a>(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
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}
fn ui_name() -> &'static str {
"View"
}
fn keymap_context(&self, _: &AppContext) -> keymap::Context {
self.keymap_context.clone()
}
}
impl View {
fn new(id: usize) -> Self {
View {
id,
keymap_context: keymap::Context::default(),
}
}
}
let mut view_1 = View::new(1);
let mut view_2 = View::new(2);
let mut view_3 = View::new(3);
view_1.keymap_context.set.insert("a".into());
view_2.keymap_context.set.insert("b".into());
view_3.keymap_context.set.insert("c".into());
let (window_id, view_1) = app.add_window(|_| view_1);
let view_2 = app.add_view(window_id, |_| view_2);
let view_3 = app.add_view(window_id, |_| view_3);
// This keymap's only binding dispatches an action on view 2 because that view will have
// "a" and "b" in its context, but not "c".
let binding = keymap::Binding::new("a", "action", Some("a && b && !c"))
.with_arg(ActionArg { key: "a".into() });
app.add_bindings(vec![binding]);
let handled_action = Rc::new(Cell::new(false));
let handled_action_clone = handled_action.clone();
app.add_action("action", move |view: &mut View, arg: &ActionArg, _ctx| {
handled_action_clone.set(true);
assert_eq!(view.id, 2);
assert_eq!(arg.key, "a");
});
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app.dispatch_keystroke(
window_id,
vec![view_1.id(), view_2.id(), view_3.id()],
&Keystroke::parse("a").unwrap(),
)
.unwrap();
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assert!(handled_action.get());
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}
#[crate::test(self)]
async fn test_model_condition(mut app: TestAppContext) {
struct Counter(usize);
impl super::Entity for Counter {
type Event = ();
}
impl Counter {
fn inc(&mut self, ctx: &mut ModelContext<Self>) {
self.0 += 1;
ctx.notify();
}
}
let model = app.add_model(|_| Counter(0));
let condition1 = model.condition(&app, |model, _| model.0 == 2);
let condition2 = model.condition(&app, |model, _| model.0 == 3);
smol::pin!(condition1, condition2);
model.update(&mut app, |model, ctx| model.inc(ctx));
assert_eq!(poll_once(&mut condition1).await, None);
assert_eq!(poll_once(&mut condition2).await, None);
model.update(&mut app, |model, ctx| model.inc(ctx));
assert_eq!(poll_once(&mut condition1).await, Some(()));
assert_eq!(poll_once(&mut condition2).await, None);
model.update(&mut app, |model, ctx| model.inc(ctx));
assert_eq!(poll_once(&mut condition2).await, Some(()));
model.update(&mut app, |_, ctx| ctx.notify());
}
#[crate::test(self)]
#[should_panic]
async fn test_model_condition_timeout(mut app: TestAppContext) {
struct Model;
impl super::Entity for Model {
type Event = ();
}
let model = app.add_model(|_| Model);
model.condition(&app, |_, _| false).await;
}
#[crate::test(self)]
#[should_panic(expected = "model dropped with pending condition")]
async fn test_model_condition_panic_on_drop(mut app: TestAppContext) {
struct Model;
impl super::Entity for Model {
type Event = ();
}
let model = app.add_model(|_| Model);
let condition = model.condition(&app, |_, _| false);
app.update(|_| drop(model));
condition.await;
}
#[crate::test(self)]
async fn test_view_condition(mut app: TestAppContext) {
struct Counter(usize);
impl super::Entity for Counter {
type Event = ();
}
impl super::View for Counter {
fn ui_name() -> &'static str {
"test view"
}
fn render(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
}
}
impl Counter {
fn inc(&mut self, ctx: &mut ViewContext<Self>) {
self.0 += 1;
ctx.notify();
}
}
let (_, view) = app.add_window(|_| Counter(0));
let condition1 = view.condition(&app, |view, _| view.0 == 2);
let condition2 = view.condition(&app, |view, _| view.0 == 3);
smol::pin!(condition1, condition2);
view.update(&mut app, |view, ctx| view.inc(ctx));
assert_eq!(poll_once(&mut condition1).await, None);
assert_eq!(poll_once(&mut condition2).await, None);
view.update(&mut app, |view, ctx| view.inc(ctx));
assert_eq!(poll_once(&mut condition1).await, Some(()));
assert_eq!(poll_once(&mut condition2).await, None);
view.update(&mut app, |view, ctx| view.inc(ctx));
assert_eq!(poll_once(&mut condition2).await, Some(()));
view.update(&mut app, |_, ctx| ctx.notify());
}
#[crate::test(self)]
#[should_panic]
async fn test_view_condition_timeout(mut app: TestAppContext) {
struct View;
impl super::Entity for View {
type Event = ();
}
impl super::View for View {
fn ui_name() -> &'static str {
"test view"
}
fn render(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
}
}
let (_, view) = app.add_window(|_| View);
view.condition(&app, |_, _| false).await;
}
#[crate::test(self)]
#[should_panic(expected = "view dropped with pending condition")]
async fn test_view_condition_panic_on_drop(mut app: TestAppContext) {
struct View;
impl super::Entity for View {
type Event = ();
}
impl super::View for View {
fn ui_name() -> &'static str {
"test view"
}
fn render(&self, _: &AppContext) -> ElementBox {
Empty::new().boxed()
}
}
let window_id = app.add_window(|_| View).0;
let view = app.add_view(window_id, |_| View);
let condition = view.condition(&app, |_, _| false);
app.update(|_| drop(view));
condition.await;
}
// #[crate::test(self)]
// fn test_ui_and_window_updates() {
// struct View {
// count: usize,
// }
// impl Entity for View {
// type Event = ();
// }
// impl super::View for View {
// fn render<'a>(&self, _: &AppContext) -> ElementBox {
// Empty::new().boxed()
// }
// fn ui_name() -> &'static str {
// "View"
// }
// }
// App::test(|app| async move {
// let (window_id, _) = app.add_window(|_| View { count: 3 });
// let view_1 = app.add_view(window_id, |_| View { count: 1 });
// let view_2 = app.add_view(window_id, |_| View { count: 2 });
// // Ensure that registering for UI updates after mutating the app still gives us all the
// // updates.
// let ui_updates = Rc::new(RefCell::new(Vec::new()));
// let ui_updates_ = ui_updates.clone();
// app.on_ui_update(move |update, _| ui_updates_.borrow_mut().push(update));
// assert_eq!(
// ui_updates.borrow_mut().drain(..).collect::<Vec<_>>(),
// vec![UiUpdate::OpenWindow {
// window_id,
// width: 1024.0,
// height: 768.0,
// }]
// );
// let window_invalidations = Rc::new(RefCell::new(Vec::new()));
// let window_invalidations_ = window_invalidations.clone();
// app.on_window_invalidated(window_id, move |update, _| {
// window_invalidations_.borrow_mut().push(update)
// });
// let view_2_id = view_2.id();
// view_1.update(app, |view, ctx| {
// view.count = 7;
// ctx.notify();
// drop(view_2);
// });
// let invalidation = window_invalidations.borrow_mut().drain(..).next().unwrap();
// assert_eq!(invalidation.updated.len(), 1);
// assert!(invalidation.updated.contains(&view_1.id()));
// assert_eq!(invalidation.removed, vec![view_2_id]);
// let view_3 = view_1.update(app, |_, ctx| ctx.add_view(|_| View { count: 8 }));
// let invalidation = window_invalidations.borrow_mut().drain(..).next().unwrap();
// assert_eq!(invalidation.updated.len(), 1);
// assert!(invalidation.updated.contains(&view_3.id()));
// assert!(invalidation.removed.is_empty());
// view_3
// .update(app, |_, ctx| {
// ctx.spawn_local(async { 9 }, |me, output, ctx| {
// me.count = output;
// ctx.notify();
// })
// })
// .await;
// let invalidation = window_invalidations.borrow_mut().drain(..).next().unwrap();
// assert_eq!(invalidation.updated.len(), 1);
// assert!(invalidation.updated.contains(&view_3.id()));
// assert!(invalidation.removed.is_empty());
// });
// }
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}