FileFinder tests (#3336)

Also including:
* Fixes for focus when closing the last item in a pane
* Workspace#active_item_as::<Editor>()
* cx.simulate_input()

Release Notes:

- N/A

crates/command_palette2/src/command_palette.rs

@@ -403,7 +403,7 @@ mod tests {
 
         let palette = workspace.update(cx, |workspace, cx| {
             workspace
-                .current_modal::<CommandPalette>(cx)
+                .active_modal::<CommandPalette>(cx)
                 .unwrap()
                 .read(cx)
                 .picker
@@ -426,7 +426,7 @@ mod tests {
         cx.simulate_keystrokes("enter");
 
         workspace.update(cx, |workspace, cx| {
-            assert!(workspace.current_modal::<CommandPalette>(cx).is_none());
+            assert!(workspace.active_modal::<CommandPalette>(cx).is_none());
             assert_eq!(editor.read(cx).text(cx), "ab")
         });
 
@@ -443,7 +443,7 @@ mod tests {
 
         let palette = workspace.update(cx, |workspace, cx| {
             workspace
-                .current_modal::<CommandPalette>(cx)
+                .active_modal::<CommandPalette>(cx)
                 .unwrap()
                 .read(cx)
                 .picker

crates/gpui2/src/app/test_context.rs

@@ -225,6 +225,9 @@ impl TestAppContext {
         self.background_executor.run_until_parked()
     }
 
+    /// simulate_keystrokes takes a space-separated list of keys to type.
+    /// cx.simulate_keystrokes("cmd-shift-p b k s p enter")
+    /// will run backspace on the current editor through the command palette.
     pub fn simulate_keystrokes(&mut self, window: AnyWindowHandle, keystrokes: &str) {
         for keystroke in keystrokes
             .split(" ")
@@ -237,6 +240,17 @@ impl TestAppContext {
         self.background_executor.run_until_parked()
     }
 
+    /// simulate_input takes a string of text to type.
+    /// cx.simulate_input("abc")
+    /// will type abc into your current editor.
+    pub fn simulate_input(&mut self, window: AnyWindowHandle, input: &str) {
+        for keystroke in input.split("").map(Keystroke::parse).map(Result::unwrap) {
+            self.dispatch_keystroke(window, keystroke.into(), false);
+        }
+
+        self.background_executor.run_until_parked()
+    }
+
     pub fn dispatch_keystroke(
         &mut self,
         window: AnyWindowHandle,
@@ -455,6 +469,10 @@ impl<'a> VisualTestContext<'a> {
     pub fn simulate_keystrokes(&mut self, keystrokes: &str) {
         self.cx.simulate_keystrokes(self.window, keystrokes)
     }
+
+    pub fn simulate_input(&mut self, input: &str) {
+        self.cx.simulate_input(self.window, input)
+    }
 }
 
 impl<'a> Context for VisualTestContext<'a> {

crates/workspace2/src/modal_layer.rs

@@ -72,7 +72,7 @@ impl ModalLayer {
         cx.notify();
     }
 
-    pub fn current_modal<V>(&self) -> Option<View<V>>
+    pub fn active_modal<V>(&self) -> Option<View<V>>
     where
         V: 'static,
     {

crates/workspace2/src/pane.rs

@@ -8,8 +8,8 @@ use anyhow::Result;
 use collections::{HashMap, HashSet, VecDeque};
 use gpui::{
     actions, prelude::*, register_action, AppContext, AsyncWindowContext, Component, Div, EntityId,
-    EventEmitter, FocusHandle, Model, PromptLevel, Render, Task, View, ViewContext, VisualContext,
-    WeakView, WindowContext,
+    EventEmitter, FocusHandle, Focusable, Model, PromptLevel, Render, Task, View, ViewContext,
+    VisualContext, WeakView, WindowContext,
 };
 use parking_lot::Mutex;
 use project2::{Project, ProjectEntryId, ProjectPath};
@@ -1017,7 +1017,11 @@ impl Pane {
                 .unwrap_or_else(|| item_index.min(self.items.len()).saturating_sub(1));
 
             let should_activate = activate_pane || self.has_focus(cx);
-            self.activate_item(index_to_activate, should_activate, should_activate, cx);
+            if self.items.len() == 1 && should_activate {
+                self.focus_handle.focus(cx);
+            } else {
+                self.activate_item(index_to_activate, should_activate, should_activate, cx);
+            }
         }
 
         let item = self.items.remove(item_index);
@@ -1913,11 +1917,12 @@ impl Pane {
 // }
 
 impl Render for Pane {
-    type Element = Div<Self>;
+    type Element = Focusable<Self, Div<Self>>;
 
     fn render(&mut self, cx: &mut ViewContext<Self>) -> Self::Element {
         v_stack()
             .key_context("Pane")
+            .track_focus(&self.focus_handle)
             .size_full()
             .on_action(|pane: &mut Self, action, cx| {
                 pane.close_active_item(action, cx)

crates/workspace2/src/workspace2.rs

@@ -38,9 +38,9 @@ use futures::{
 use gpui::{
     actions, div, point, prelude::*, rems, size, Action, AnyModel, AnyView, AnyWeakView,
     AppContext, AsyncAppContext, AsyncWindowContext, Bounds, Component, Div, Entity, EntityId,
-    EventEmitter, FocusHandle, GlobalPixels, KeyContext, Model, ModelContext, ParentComponent,
-    Point, Render, Size, Styled, Subscription, Task, View, ViewContext, WeakView, WindowBounds,
-    WindowContext, WindowHandle, WindowOptions,
+    EventEmitter, GlobalPixels, KeyContext, Model, ModelContext, ParentComponent, Point, Render,
+    Size, Styled, Subscription, Task, View, ViewContext, WeakView, WindowBounds, WindowContext,
+    WindowHandle, WindowOptions,
 };
 use item::{FollowableItem, FollowableItemHandle, Item, ItemHandle, ItemSettings, ProjectItem};
 use itertools::Itertools;
@@ -433,7 +433,6 @@ pub enum Event {
 
 pub struct Workspace {
     weak_self: WeakView<Self>,
-    focus_handle: FocusHandle,
     workspace_actions: Vec<Box<dyn Fn(Div<Workspace>) -> Div<Workspace>>>,
     zoomed: Option<AnyWeakView>,
     zoomed_position: Option<DockPosition>,
@@ -651,7 +650,6 @@ impl Workspace {
         cx.defer(|this, cx| this.update_window_title(cx));
         Workspace {
             weak_self: weak_handle.clone(),
-            focus_handle: cx.focus_handle(),
             zoomed: None,
             zoomed_position: None,
             center: PaneGroup::new(center_pane.clone()),
@@ -1450,6 +1448,11 @@ impl Workspace {
         self.active_pane().read(cx).active_item()
     }
 
+    pub fn active_item_as<I: 'static>(&self, cx: &AppContext) -> Option<View<I>> {
+        let item = self.active_item(cx)?;
+        item.to_any().downcast::<I>().ok()
+    }
+
     fn active_project_path(&self, cx: &ViewContext<Self>) -> Option<ProjectPath> {
         self.active_item(cx).and_then(|item| item.project_path(cx))
     }
@@ -1570,7 +1573,7 @@ impl Workspace {
         }
 
         if focus_center {
-            cx.focus(&self.focus_handle);
+            self.active_pane.update(cx, |pane, cx| pane.focus(cx))
         }
 
         cx.notify();
@@ -1704,7 +1707,7 @@ impl Workspace {
         }
 
         if focus_center {
-            cx.focus(&self.focus_handle);
+            self.active_pane.update(cx, |pane, cx| pane.focus(cx))
         }
 
         if self.zoomed_position != dock_to_reveal {
@@ -3475,8 +3478,8 @@ impl Workspace {
         div
     }
 
-    pub fn current_modal<V: Modal + 'static>(&mut self, cx: &ViewContext<Self>) -> Option<View<V>> {
-        self.modal_layer.read(cx).current_modal()
+    pub fn active_modal<V: Modal + 'static>(&mut self, cx: &ViewContext<Self>) -> Option<View<V>> {
+        self.modal_layer.read(cx).active_modal()
     }
 
     pub fn toggle_modal<V: Modal, B>(&mut self, cx: &mut ViewContext<Self>, build: B)