chore: Upgrade to GPUI3 (#6)

* wip: gpui3

* wip: gpui3

* chore: fix clippy

crates/app/src/views/welcome.rs

@@ -1,13 +1,10 @@
 use gpui::{
-    div, svg, AnyElement, AppContext, EventEmitter, FocusHandle, FocusableView, IntoElement,
-    ParentElement, Render, SharedString, Styled, View, ViewContext, VisualContext, WindowContext,
+    div, svg, AnyElement, App, AppContext, Context, Entity, EventEmitter, FocusHandle, Focusable,
+    IntoElement, ParentElement, Render, SharedString, Styled, Window,
 };
 use ui::{
     button::Button,
-    dock_area::{
-        panel::{Panel, PanelEvent},
-        state::PanelState,
-    },
+    dock_area::panel::{Panel, PanelEvent},
     popup_menu::PopupMenu,
     theme::{scale::ColorScaleStep, ActiveTheme},
     StyledExt,
@@ -21,11 +18,11 @@ pub struct WelcomePanel {
 }
 
 impl WelcomePanel {
-    pub fn new(cx: &mut WindowContext) -> View<Self> {
-        cx.new_view(Self::view)
+    pub fn new(window: &mut Window, cx: &mut App) -> Entity<Self> {
+        cx.new(|cx| Self::view(window, cx))
     }
 
-    fn view(cx: &mut ViewContext<Self>) -> Self {
+    fn view(_window: &mut Window, cx: &mut Context<Self>) -> Self {
         Self {
             name: "Welcome".into(),
             closeable: true,
@@ -40,41 +37,37 @@ impl Panel for WelcomePanel {
         "WelcomePanel".into()
     }
 
-    fn title(&self, _cx: &WindowContext) -> AnyElement {
+    fn title(&self, _cx: &App) -> AnyElement {
         self.name.clone().into_any_element()
     }
 
-    fn closeable(&self, _cx: &WindowContext) -> bool {
+    fn closeable(&self, _cx: &App) -> bool {
         self.closeable
     }
 
-    fn zoomable(&self, _cx: &WindowContext) -> bool {
+    fn zoomable(&self, _cx: &App) -> bool {
         self.zoomable
     }
 
-    fn popup_menu(&self, menu: PopupMenu, _cx: &WindowContext) -> PopupMenu {
+    fn popup_menu(&self, menu: PopupMenu, _cx: &App) -> PopupMenu {
         menu.track_focus(&self.focus_handle)
     }
 
-    fn toolbar_buttons(&self, _cx: &WindowContext) -> Vec<Button> {
+    fn toolbar_buttons(&self, _window: &Window, _cx: &App) -> Vec<Button> {
         vec![]
     }
-
-    fn dump(&self, _cx: &AppContext) -> PanelState {
-        PanelState::new(self)
-    }
 }
 
 impl EventEmitter<PanelEvent> for WelcomePanel {}
 
-impl FocusableView for WelcomePanel {
-    fn focus_handle(&self, _: &AppContext) -> gpui::FocusHandle {
+impl Focusable for WelcomePanel {
+    fn focus_handle(&self, _: &App) -> gpui::FocusHandle {
         self.focus_handle.clone()
     }
 }
 
 impl Render for WelcomePanel {
-    fn render(&mut self, cx: &mut gpui::ViewContext<Self>) -> impl IntoElement {
+    fn render(&mut self, _window: &mut gpui::Window, cx: &mut Context<Self>) -> impl IntoElement {
         div()
             .size_full()
             .flex()