multi_workspace: Add actions to cycle workspace (#52156)

crates/workspace/src/multi_workspace.rs

@@ -30,6 +30,10 @@ actions!(
         CloseWorkspaceSidebar,
         /// Moves focus to or from the workspace sidebar without closing it.
         FocusWorkspaceSidebar,
+        /// Switches to the next workspace.
+        NextWorkspace,
+        /// Switches to the previous workspace.
+        PreviousWorkspace,
     ]
 );
 
@@ -405,6 +409,29 @@ impl MultiWorkspace {
         cx.notify();
     }
 
+    fn cycle_workspace(&mut self, delta: isize, window: &mut Window, cx: &mut Context<Self>) {
+        let count = self.workspaces.len() as isize;
+        if count <= 1 {
+            return;
+        }
+        let current = self.active_workspace_index as isize;
+        let next = ((current + delta).rem_euclid(count)) as usize;
+        self.activate_index(next, window, cx);
+    }
+
+    fn next_workspace(&mut self, _: &NextWorkspace, window: &mut Window, cx: &mut Context<Self>) {
+        self.cycle_workspace(1, window, cx);
+    }
+
+    fn previous_workspace(
+        &mut self,
+        _: &PreviousWorkspace,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
+        self.cycle_workspace(-1, window, cx);
+    }
+
     fn serialize(&mut self, cx: &mut App) {
         let window_id = self.window_id;
         let state = crate::persistence::model::MultiWorkspaceState {
@@ -760,6 +787,8 @@ impl Render for MultiWorkspace {
                             this.focus_sidebar(window, cx);
                         },
                     ))
+                    .on_action(cx.listener(Self::next_workspace))
+                    .on_action(cx.listener(Self::previous_workspace))
                 })
                 .when(
                     self.sidebar_open() && self.multi_workspace_enabled(cx),

crates/workspace/src/workspace.rs

@@ -28,7 +28,8 @@ pub use crate::notifications::NotificationFrame;
 pub use dock::Panel;
 pub use multi_workspace::{
     CloseWorkspaceSidebar, DraggedSidebar, FocusWorkspaceSidebar, MultiWorkspace,
-    MultiWorkspaceEvent, Sidebar, SidebarHandle, ToggleWorkspaceSidebar,
+    MultiWorkspaceEvent, NextWorkspace, PreviousWorkspace, Sidebar, SidebarHandle,
+    ToggleWorkspaceSidebar,
 };
 pub use path_list::{PathList, SerializedPathList};
 pub use toast_layer::{ToastAction, ToastLayer, ToastView};