Open popup window when receiving a call

We still need to style and allow people to accept the call but this
is a good starting point.

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

crates/collab_ui/src/collab_ui.rs

@@ -1,10 +1,86 @@
 mod collab_titlebar_item;
 mod contacts_popover;
 
+use client::{call::Call, UserStore};
 pub use collab_titlebar_item::CollabTitlebarItem;
-use gpui::MutableAppContext;
+use futures::StreamExt;
+use gpui::{
+    elements::*,
+    geometry::{rect::RectF, vector::vec2f},
+    Entity, ModelHandle, MutableAppContext, View, WindowBounds, WindowKind, WindowOptions,
+};
+use settings::Settings;
 
-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(user_store: ModelHandle<UserStore>, cx: &mut MutableAppContext) {
     contacts_popover::init(cx);
     collab_titlebar_item::init(cx);
+
+    let mut incoming_call = user_store.read(cx).incoming_call();
+    cx.spawn(|mut cx| async move {
+        let mut notification_window = None;
+        while let Some(incoming_call) = incoming_call.next().await {
+            if let Some(window_id) = notification_window.take() {
+                cx.remove_window(window_id);
+            }
+
+            if let Some(incoming_call) = incoming_call {
+                let (window_id, _) = cx.add_window(
+                    WindowOptions {
+                        bounds: WindowBounds::Fixed(RectF::new(vec2f(0., 0.), vec2f(300., 400.))),
+                        titlebar: None,
+                        center: true,
+                        kind: WindowKind::PopUp,
+                        is_movable: false,
+                    },
+                    |_| IncomingCallNotification::new(incoming_call),
+                );
+                notification_window = Some(window_id);
+            }
+        }
+    })
+    .detach();
+}
+
+struct IncomingCallNotification {
+    call: Call,
+}
+
+impl IncomingCallNotification {
+    fn new(call: Call) -> Self {
+        Self { call }
+    }
+}
+
+impl Entity for IncomingCallNotification {
+    type Event = ();
+}
+
+impl View for IncomingCallNotification {
+    fn ui_name() -> &'static str {
+        "IncomingCallNotification"
+    }
+
+    fn render(&mut self, cx: &mut gpui::RenderContext<'_, Self>) -> gpui::ElementBox {
+        let theme = &cx.global::<Settings>().theme.contacts_panel;
+        Flex::row()
+            .with_children(self.call.from.avatar.clone().map(|avatar| {
+                Image::new(avatar)
+                    .with_style(theme.contact_avatar)
+                    .aligned()
+                    .left()
+                    .boxed()
+            }))
+            .with_child(
+                Label::new(
+                    self.call.from.github_login.clone(),
+                    theme.contact_username.text.clone(),
+                )
+                .contained()
+                .aligned()
+                .left()
+                .flex(1., true)
+                .boxed(),
+            )
+            .boxed()
+    }
 }

crates/gpui/src/app.rs

@@ -786,6 +786,10 @@ impl AsyncAppContext {
         self.update(|cx| cx.add_window(window_options, build_root_view))
     }
 
+    pub fn remove_window(&mut self, window_id: usize) {
+        self.update(|cx| cx.remove_window(window_id))
+    }
+
     pub fn platform(&self) -> Arc<dyn Platform> {
         self.0.borrow().platform()
     }

crates/zed/src/main.rs

@@ -107,7 +107,7 @@ fn main() {
         project::Project::init(&client);
         client::Channel::init(&client);
         client::init(client.clone(), cx);
-        collab_ui::init(cx);
+        collab_ui::init(user_store.clone(), cx);
         command_palette::init(cx);
         editor::init(cx);
         go_to_line::init(cx);