drawer: Render notification at the side of drawer when drawer (top, right) it opened. (#512)

This change to make sure notification will display when WebView render
on the drawer.

![Screenshot from 2024-12-24
09-25-10](https://github.com/user-attachments/assets/01d9685c-7790-4fe7-ba0a-217a0fec7d34)

crates/story/src/modal_story.rs

@@ -292,14 +292,20 @@ impl ModalStory {
         };
 
         let overlay = self.modal_overlay;
-        cx.open_drawer(move |this, cx| {
-            this.placement(placement)
-                .overlay(overlay)
+        cx.open_drawer_at(placement, move |this, cx| {
+            this.overlay(overlay)
                 .size(px(400.))
                 .title("Drawer Title")
                 .gap_4()
                 .child(input.clone())
                 .child(date_picker.clone())
+                .child(
+                    Button::new("send-notification")
+                        .child("Test Notification")
+                        .on_click(|_, cx| {
+                            cx.push_notification("Hello this is message from Drawer.")
+                        }),
+                )
                 .child(
                     div()
                         .border_1()

crates/ui/src/drawer.rs

@@ -28,8 +28,8 @@ pub fn init(cx: &mut AppContext) {
 #[derive(IntoElement)]
 pub struct Drawer {
     pub(crate) focus_handle: FocusHandle,
-    placement: Placement,
-    size: DefiniteLength,
+    pub(crate) placement: Placement,
+    pub(crate) size: DefiniteLength,
     resizable: bool,
     on_close: Rc<dyn Fn(&ClickEvent, &mut WindowContext) + 'static>,
     title: Option<AnyElement>,
@@ -81,17 +81,6 @@ impl Drawer {
         self
     }
 
-    /// Sets the placement of the drawer, default is `Placement::Right`.
-    pub fn placement(mut self, placement: Placement) -> Self {
-        self.placement = placement;
-        self
-    }
-
-    /// Sets the placement of the drawer, default is `Placement::Right`.
-    pub fn set_placement(&mut self, placement: Placement) {
-        self.placement = placement;
-    }
-
     /// Sets whether the drawer is resizable, default is `true`.
     pub fn resizable(mut self, resizable: bool) -> Self {
         self.resizable = resizable;

crates/ui/src/root.rs

@@ -3,10 +3,12 @@ use crate::{
     modal::Modal,
     notification::{Notification, NotificationList},
     theme::ActiveTheme,
+    Placement,
 };
 use gpui::{
-    div, AnyView, FocusHandle, InteractiveElement, IntoElement, ParentElement as _, Render, Styled,
-    View, ViewContext, VisualContext as _, WindowContext,
+    canvas, div, prelude::FluentBuilder as _, AnyView, DefiniteLength, FocusHandle,
+    InteractiveElement, IntoElement, ParentElement as _, Render, Styled, View, ViewContext,
+    VisualContext as _, WindowContext,
 };
 use std::{
     ops::{Deref, DerefMut},
@@ -15,11 +17,16 @@ use std::{
 
 /// Extension trait for [`WindowContext`] and [`ViewContext`] to add drawer functionality.
 pub trait ContextModal: Sized {
-    /// Opens a Drawer.
+    /// Opens a Drawer at right placement.
     fn open_drawer<F>(&mut self, build: F)
     where
         F: Fn(Drawer, &mut WindowContext) -> Drawer + 'static;
 
+    /// Opens a Drawer at the given placement.
+    fn open_drawer_at<F>(&mut self, placement: Placement, build: F)
+    where
+        F: Fn(Drawer, &mut WindowContext) -> Drawer + 'static;
+
     /// Return true, if there is an active Drawer.
     fn has_active_drawer(&self) -> bool;
 
@@ -49,6 +56,13 @@ pub trait ContextModal: Sized {
 
 impl ContextModal for WindowContext<'_> {
     fn open_drawer<F>(&mut self, build: F)
+    where
+        F: Fn(Drawer, &mut WindowContext) -> Drawer + 'static,
+    {
+        self.open_drawer_at(Placement::Right, build)
+    }
+
+    fn open_drawer_at<F>(&mut self, placement: Placement, build: F)
     where
         F: Fn(Drawer, &mut WindowContext) -> Drawer + 'static,
     {
@@ -62,6 +76,7 @@ impl ContextModal for WindowContext<'_> {
 
             root.active_drawer = Some(ActiveDrawer {
                 focus_handle,
+                placement,
                 builder: Rc::new(build),
             });
             cx.notify();
@@ -156,6 +171,13 @@ impl<V> ContextModal for ViewContext<'_, V> {
         self.deref_mut().open_drawer(build)
     }
 
+    fn open_drawer_at<F>(&mut self, placement: Placement, build: F)
+    where
+        F: Fn(Drawer, &mut WindowContext) -> Drawer + 'static,
+    {
+        self.deref_mut().open_drawer_at(placement, build)
+    }
+
     fn has_active_modal(&self) -> bool {
         self.deref().has_active_modal()
     }
@@ -208,12 +230,14 @@ pub struct Root {
     active_drawer: Option<ActiveDrawer>,
     active_modals: Vec<ActiveModal>,
     pub notification: View<NotificationList>,
+    drawer_size: Option<DefiniteLength>,
     view: AnyView,
 }
 
 #[derive(Clone)]
 struct ActiveDrawer {
     focus_handle: FocusHandle,
+    placement: Placement,
     builder: Rc<dyn Fn(Drawer, &mut WindowContext) -> Drawer + 'static>,
 }
 
@@ -230,6 +254,7 @@ impl Root {
             active_drawer: None,
             active_modals: Vec::new(),
             notification: cx.new_view(NotificationList::new),
+            drawer_size: None,
             view,
         }
     }
@@ -263,6 +288,14 @@ impl Root {
         }
     }
 
+    fn active_drawer_placement(&self, cx: &WindowContext) -> Option<Placement> {
+        if let Some(drawer) = Root::read(cx).active_drawer.as_ref() {
+            Some(drawer.placement)
+        } else {
+            None
+        }
+    }
+
     // Render Notification layer.
     pub fn render_notification_layer(cx: &mut WindowContext) -> Option<impl IntoElement> {
         let root = cx
@@ -271,7 +304,20 @@ impl Root {
             .and_then(|w| w.root_view(cx).ok())
             .expect("The window root view should be of type `ui::Root`.");
 
-        Some(div().child(root.read(cx).notification.clone()))
+        let active_drawer_placement = root.read(cx).active_drawer_placement(cx);
+
+        let (mt, mr) = match active_drawer_placement {
+            Some(Placement::Right) => (None, root.read(cx).drawer_size),
+            Some(Placement::Top) => (root.read(cx).drawer_size, None),
+            _ => (None, None),
+        };
+
+        Some(
+            div()
+                .when_some(mt, |this, offset| this.mt(offset))
+                .when_some(mr, |this, offset| this.mr(offset))
+                .child(root.read(cx).notification.clone()),
+        )
     }
 
     /// Render the Drawer layer.
@@ -286,8 +332,20 @@ impl Root {
             let mut drawer = Drawer::new(cx);
             drawer = (active_drawer.builder)(drawer, cx);
             drawer.focus_handle = active_drawer.focus_handle.clone();
+            drawer.placement = active_drawer.placement;
 
-            return Some(div().child(drawer));
+            let drawer_size = drawer.size;
+
+            return Some(
+                div().relative().child(drawer).child(
+                    canvas(
+                        move |_, cx| root.update(cx, |r, _| r.drawer_size = Some(drawer_size)),
+                        |_, _, _| {},
+                    )
+                    .absolute()
+                    .size_full(),
+                ),
+            );
         }
 
         None