Add keyboard shortcuts for the prompts on Linux (#13915)

This change adds ability to choose any action from prompts, not just the
default one and cancel as Zed has right now. For example, when a user
tries to close a file with edits in it the prompt offers "Don't save"
option that can be selected only with mouse. Now you can use arrows,
tab/shift-tab to pick action and enter/space to confirm it.

Fixes [#13906](https://github.com/zed-industries/zed/issues/13906)


Release Notes:

- Added keyboard navigation in the prompts on Linux
([#13906](https://github.com/zed-industries/zed/issues/13906)).


Co-authored-by: Thorsten Ball <mrnugget@gmail.com>

assets/keymaps/default-linux.json

@@ -3,10 +3,14 @@
   {
     "bindings": {
       "up": "menu::SelectPrev",
+      "shift-tab": "menu::SelectPrev",
+      "home": "menu::SelectFirst",
       "pageup": "menu::SelectFirst",
       "shift-pageup": "menu::SelectFirst",
       "ctrl-p": "menu::SelectPrev",
       "down": "menu::SelectNext",
+      "tab": "menu::SelectNext",
+      "end": "menu::SelectLast",
       "pagedown": "menu::SelectLast",
       "shift-pagedown": "menu::SelectFirst",
       "ctrl-n": "menu::SelectNext",

assets/keymaps/default-macos.json

@@ -3,10 +3,14 @@
   {
     "bindings": {
       "up": "menu::SelectPrev",
+      "shift-tab": "menu::SelectPrev",
+      "home": "menu::SelectFirst",
       "pageup": "menu::SelectFirst",
       "shift-pageup": "menu::SelectFirst",
       "ctrl-p": "menu::SelectPrev",
       "down": "menu::SelectNext",
+      "tab": "menu::SelectNext",
+      "end": "menu::SelectLast",
       "pagedown": "menu::SelectLast",
       "shift-pagedown": "menu::SelectFirst",
       "ctrl-n": "menu::SelectNext",

crates/zed/src/zed/linux_prompts.rs

@@ -31,6 +31,7 @@ pub fn fallback_prompt_renderer(
             detail: detail.map(ToString::to_string),
             actions: actions.iter().map(ToString::to_string).collect(),
             focus: cx.focus_handle(),
+            active_action_id: actions.len() - 1,
         }
     });
 
@@ -44,10 +45,12 @@ pub struct FallbackPromptRenderer {
     detail: Option<String>,
     actions: Vec<String>,
     focus: FocusHandle,
+    active_action_id: usize,
 }
+
 impl FallbackPromptRenderer {
     fn confirm(&mut self, _: &menu::Confirm, cx: &mut ViewContext<Self>) {
-        cx.emit(PromptResponse(0));
+        cx.emit(PromptResponse(self.active_action_id));
     }
 
     fn cancel(&mut self, _: &menu::Cancel, cx: &mut ViewContext<Self>) {
@@ -55,7 +58,32 @@ impl FallbackPromptRenderer {
             cx.emit(PromptResponse(ix));
         }
     }
+
+    fn select_first(&mut self, _: &menu::SelectFirst, cx: &mut ViewContext<Self>) {
+        self.active_action_id = 0;
+        cx.notify();
+    }
+
+    fn select_last(&mut self, _: &menu::SelectLast, cx: &mut ViewContext<Self>) {
+        self.active_action_id = self.actions.len().saturating_sub(1);
+        cx.notify();
+    }
+
+    fn select_next(&mut self, _: &menu::SelectNext, cx: &mut ViewContext<Self>) {
+        self.active_action_id = (self.active_action_id + 1) % self.actions.len();
+        cx.notify();
+    }
+
+    fn select_prev(&mut self, _: &menu::SelectPrev, cx: &mut ViewContext<Self>) {
+        if self.active_action_id > 0 {
+            self.active_action_id -= 1;
+        } else {
+            self.active_action_id = self.actions.len().saturating_sub(1);
+        }
+        cx.notify();
+    }
 }
+
 impl Render for FallbackPromptRenderer {
     fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
         let settings = ThemeSettings::get_global(cx);
@@ -66,6 +94,10 @@ impl Render for FallbackPromptRenderer {
             .track_focus(&self.focus)
             .on_action(cx.listener(Self::confirm))
             .on_action(cx.listener(Self::cancel))
+            .on_action(cx.listener(Self::select_next))
+            .on_action(cx.listener(Self::select_prev))
+            .on_action(cx.listener(Self::select_first))
+            .on_action(cx.listener(Self::select_last))
             .elevation_3(cx)
             .w_72()
             .overflow_hidden()
@@ -87,11 +119,11 @@ impl Render for FallbackPromptRenderer {
                     .child(detail)
             }))
             .child(h_flex().justify_end().gap_2().children(
-                self.actions.iter().enumerate().rev().map(|(ix, action)| {
+                self.actions.iter().rev().enumerate().map(|(ix, action)| {
                     ui::Button::new(ix, action.clone())
                         .label_size(LabelSize::Large)
                         .style(ButtonStyle::Filled)
-                        .when(ix == 0, |el| {
+                        .when(ix == self.active_action_id, |el| {
                             el.style(ButtonStyle::Tinted(TintColor::Accent))
                         })
                         .layer(ElevationIndex::ModalSurface)