feat(wm): add visual feedback for preselection

This commit adds visual feedback in the form of a ghost tile for
preselections made by the preselect-direction command.

A container with the id "PRESELECT" will be added to the workspace, and
replaced when the next manage-able window is spawned.

A new command, cancel-preselect, has been added to remove both the
preselection index and the ghost tile if the user changes their mind.

docs/cli/cancel-preselect.md

@@ -0,0 +1,12 @@
+# cancel-preselect
+
+```
+Cancel a workspace preselect set by the preselect-direction command, if one exists
+
+Usage: komorebic.exe cancel-preselect
+
+Options:
+  -h, --help
+          Print help
+
+```

komorebi/src/container.rs

@@ -41,6 +41,18 @@ impl Lockable for Container {
 }
 
 impl Container {
+    pub fn preselect() -> Self {
+        Self {
+            id: "PRESELECT".to_string(),
+            locked: false,
+            windows: Default::default(),
+        }
+    }
+
+    pub fn is_preselect(&self) -> bool {
+        self.id == "PRESELECT"
+    }
+
     pub fn hide(&self, omit: Option<isize>) {
         for window in self.windows().iter().rev() {
             let mut should_hide = omit.is_none();

komorebi/src/core/mod.rs

@@ -56,6 +56,7 @@ pub enum SocketMessage {
     FocusWindow(OperationDirection),
     MoveWindow(OperationDirection),
     PreselectDirection(OperationDirection),
+    CancelPreselect,
     CycleFocusWindow(CycleDirection),
     CycleMoveWindow(CycleDirection),
     StackWindow(OperationDirection),

komorebi/src/process_command.rs

@@ -305,9 +305,25 @@ impl WindowManager {
             }
             SocketMessage::PreselectDirection(direction) => {
                 let focused_workspace = self.focused_workspace()?;
-                if matches!(focused_workspace.layer, WorkspaceLayer::Tiling) {
+                let mut update = false;
+
+                if focused_workspace.preselected_container_idx.is_some() {
+                    tracing::warn!(
+                        "ignoring command as this workspace already has a direction preselect set"
+                    );
+                } else if matches!(focused_workspace.layer, WorkspaceLayer::Tiling) {
                     self.preselect_container_in_direction(direction)?;
+                    update = true;
                 }
+
+                if update {
+                    self.focused_workspace_mut()?.update()?;
+                }
+            }
+            SocketMessage::CancelPreselect => {
+                let focused_workspace = self.focused_workspace_mut()?;
+                focused_workspace.cancel_preselect();
+                focused_workspace.update()?;
             }
             SocketMessage::MoveWindow(direction) => {
                 let focused_workspace = self.focused_workspace()?;

komorebi/src/window_manager.rs

@@ -2077,7 +2077,7 @@ impl WindowManager {
                     _ => new_idx,
                 };
 
-                workspace.preselect_container_index(adjusted_idx);
+                workspace.preselect_container_idx(adjusted_idx);
             }
             None => {
                 tracing::debug!(

komorebi/src/workspace.rs

@@ -449,7 +449,8 @@ impl Workspace {
         }
 
         // make sure we are never holding on to empty containers
-        self.containers_mut().retain(|c| !c.windows().is_empty());
+        self.containers_mut()
+            .retain(|c| c.is_preselect() || !c.windows().is_empty());
 
         let container_padding = self
             .container_padding
@@ -979,8 +980,16 @@ impl Workspace {
         container
     }
 
-    pub fn preselect_container_index(&mut self, insertion_index: usize) {
+    pub fn preselect_container_idx(&mut self, insertion_idx: usize) {
-        self.preselected_container_idx = Some(insertion_index);
+        self.preselected_container_idx = Some(insertion_idx);
+        self.insert_container_at_idx(insertion_idx, Container::preselect());
+    }
+
+    pub fn cancel_preselect(&mut self) {
+        if let Some(idx) = self.preselected_container_idx {
+            self.containers_mut().remove_respecting_locks(idx);
+            self.preselected_container_idx = None;
+        }
     }
 
     pub fn new_idx_for_direction(&self, direction: OperationDirection) -> Option<usize> {
@@ -1084,9 +1093,8 @@ impl Workspace {
     pub fn new_container_for_window(&mut self, window: Window) {
         let next_idx = if let Some(idx) = self.preselected_container_idx {
             let next = idx;
-
             self.preselected_container_idx = None;
-
+            self.remove_container_by_idx(next);
             next
         } else if self.containers().is_empty() {
             0

komorebic/src/main.rs

@@ -1099,6 +1099,8 @@ enum SubCommand {
     /// Preselect the specified direction for the next window to be spawned on supported layouts
     #[clap(arg_required_else_help = true)]
     PreselectDirection(PreselectDirection),
+    /// Cancel a workspace preselect set by the preselect-direction command, if one exists
+    CancelPreselect,
     /// Minimize the focused window
     Minimize,
     /// Close the focused window
@@ -2045,6 +2047,9 @@ fn main() -> eyre::Result<()> {
         SubCommand::PreselectDirection(arg) => {
             send_message(&SocketMessage::PreselectDirection(arg.operation_direction))?;
         }
+        SubCommand::CancelPreselect => {
+            send_message(&SocketMessage::CancelPreselect)?;
+        }
         SubCommand::CycleFocus(arg) => {
             send_message(&SocketMessage::CycleFocusWindow(arg.cycle_direction))?;
         }

mkdocs.yml

@@ -112,6 +112,7 @@ nav:
       - cli/focus.md
       - cli/move.md
       - cli/preselect-direction.md
+      - cli/cancel-preselect.md
       - cli/minimize.md
       - cli/close.md
       - cli/force-focus.md