Move filesystem tree functions out of the layer implementation

src/app.rs

@@ -5,6 +5,7 @@ use crossterm::event::{Event, KeyEventKind};
 use crate::input::keymap::KeyBinding;
 use crate::state::{Environment, State};
 use crate::state::action::ActionResult;
+use crate::state::event::EventResult;
 use crate::state::view::View;
 
 pub fn run(start_path: &Path) -> std::io::Result<()> {
@@ -14,41 +15,55 @@ pub fn run(start_path: &Path) -> std::io::Result<()> {
 	let environment = Environment::try_from(&view)?;
 	let mut state = State::with_root_path(start_path, environment);
 	
-	'render: loop {
+	loop {
+		match state.handle_events() {
+			EventResult::Nothing => {}
+			
+			EventResult::Draw => {
+				view.set_dirty(false);
+			}
+			
+			EventResult::Redraw => {
+				view.set_dirty(true);
+			}
+		}
+		
 		view.render(|frame| state.render(frame))?;
 		
-		'event: loop {
-			match handle_event(&mut state, crossterm::event::read()?) {
-				ActionResult::Nothing => {
-					continue 'event;
-				}
-				
-				ActionResult::Draw => {
-					continue 'render;
-				}
-				
-				ActionResult::Redraw => {
-					view.clear()?;
-					continue 'render;
-				}
-				
-				ActionResult::PushLayer(layer) => {
-					state.push_layer(layer);
-					continue 'render;
-				}
-				
-				ActionResult::ReplaceLayer(layer) => {
-					state.pop_layer();
-					state.push_layer(layer);
-					continue 'render;
-				}
-				
-				ActionResult::PopLayer => {
-					if state.pop_layer() {
-						break 'render;
-					} else {
-						continue 'render;
-					}
+		match handle_terminal_event(&mut state, crossterm::event::read()?) {
+			ActionResult::Nothing => {
+				continue;
+			}
+			
+			ActionResult::Draw => {
+				view.set_dirty(false);
+				continue;
+			}
+			
+			ActionResult::Redraw => {
+				view.set_dirty(true);
+				continue;
+			}
+			
+			ActionResult::PushLayer(layer) => {
+				state.push_layer(layer);
+				view.set_dirty(false);
+				continue;
+			}
+			
+			ActionResult::ReplaceLayer(layer) => {
+				state.pop_layer();
+				state.push_layer(layer);
+				view.set_dirty(false);
+				continue;
+			}
+			
+			ActionResult::PopLayer => {
+				if state.pop_layer() {
+					break;
+				} else {
+					view.set_dirty(false);
+					continue;
 				}
 			}
 		}
@@ -58,7 +73,7 @@ pub fn run(start_path: &Path) -> std::io::Result<()> {
 }
 
 #[allow(clippy::needless_pass_by_value)]
-fn handle_event(state: &mut State, event: Event) -> ActionResult {
+fn handle_terminal_event(state: &mut State, event: Event) -> ActionResult {
 	if let Event::Key(key) = event {
 		if key.kind == KeyEventKind::Release {
 			ActionResult::Nothing

src/component/dialog/input/builder.rs

@@ -69,7 +69,7 @@ impl<'a> InputFieldDialogBuilder5<'a> {
 		self
 	}
 	
-	pub fn build(self, confirm_action: Box<dyn Fn(String) -> ActionResult>) -> InputFieldDialogLayer<'a> {
+	pub fn on_confirm<F>(self, confirm_action: F) -> InputFieldDialogLayer<'a> where F: Fn(String) -> ActionResult + 'static {
 		let step4 = self.step4;
 		let step3 = step4.step3;
 		let step2 = step3.step2;

src/component/dialog/input/mod.rs

@@ -12,6 +12,7 @@ use crate::component::input::InputField;
 use crate::input::keymap::KeyBinding;
 use crate::state::action::ActionResult;
 use crate::state::Environment;
+use crate::state::event::EventResult;
 use crate::state::layer::Layer;
 use crate::state::view::Frame;
 
@@ -29,8 +30,9 @@ pub struct InputFieldDialogLayer<'a> {
 }
 
 impl<'a> InputFieldDialogLayer<'a> {
-	fn new(y: u16, min_width: u16, default_color: Color, darker_color: Color, title: Line<'a>, message: Text<'a>, initial_value: Option<String>, confirm_action: Box<dyn Fn(String) -> ActionResult>) -> Self {
+	fn new<F>(y: u16, min_width: u16, default_color: Color, darker_color: Color, title: Line<'a>, message: Text<'a>, initial_value: Option<String>, confirm_action: F) -> Self where F: Fn(String) -> ActionResult + 'static {
 		let field = initial_value.map_or_else(InputField::new, InputField::with_text);
+		let confirm_action = Box::new(confirm_action);
 		Self { y, min_width, default_color, darker_color, title, message, field, confirm_action }
 	}
 	
@@ -58,6 +60,10 @@ impl<'a> Layer for InputFieldDialogLayer<'a> {
 		}
 	}
 	
+	fn handle_events(&mut self, _environment: &Environment) -> EventResult {
+		EventResult::Nothing
+	}
+	
 	fn render(&mut self, frame: &mut Frame) {
 		let message_width = u16::try_from(self.message.width()).unwrap_or(u16::MAX);
 		let message_height = u16::try_from(self.message.height()).unwrap_or(u16::MAX);

src/component/dialog/message/actions.rs

@@ -37,9 +37,9 @@ impl<'a> MessageDialogActionMap<'a> {
 		])
 	}
 	
-	pub fn yes_no(yes_action: Box<dyn Fn() -> ActionResult>) -> Self {
+	pub fn yes_no<F>(yes_action: F) -> Self where F: Fn() -> ActionResult + 'static {
 		let mut map = ActionHashMap::new();
-		map.insert(KeyBinding::char('y'), yes_action);
+		map.insert(KeyBinding::char('y'), Box::new(yes_action));
 		map.insert(KeyBinding::char('n'), Box::new(|| ActionResult::PopLayer));
 		
 		Self::new(map, vec![

src/component/dialog/message/builder.rs

@@ -63,7 +63,7 @@ impl<'a> MessageDialogBuilder4<'a> {
 		self.actions(MessageDialogActionMap::ok())
 	}
 	
-	pub fn yes_no(self, yes_action: Box<dyn Fn() -> ActionResult>) -> MessageDialogLayer<'a> {
+	pub fn yes_no<F>(self, yes_action: F) -> MessageDialogLayer<'a> where F: Fn() -> ActionResult + 'static {
 		self.actions(MessageDialogActionMap::yes_no(yes_action))
 	}
 }

src/component/dialog/message/mod.rs

@@ -10,6 +10,7 @@ use crate::component::dialog::render_dialog_border;
 use crate::input::keymap::KeyBinding;
 use crate::state::action::ActionResult;
 use crate::state::Environment;
+use crate::state::event::EventResult;
 use crate::state::layer::Layer;
 use crate::state::view::Frame;
 
@@ -40,7 +41,7 @@ impl<'a> MessageDialogLayer<'a> {
 		MessageDialogBuilder
 	}
 	
-	pub fn generic_error(y: u16, message: impl Into<Text<'a>>) -> MessageDialogLayer<'a> {
+	pub fn error(y: u16, message: impl Into<Text<'a>>) -> MessageDialogLayer<'a> {
 		Self::build()
 			.y(y)
 			.color(Color::LightRed)
@@ -55,6 +56,10 @@ impl Layer for MessageDialogLayer<'_> {
 		self.actions.handle_input(key_binding)
 	}
 	
+	fn handle_events(&mut self, _environment: &Environment) -> EventResult {
+		EventResult::Nothing
+	}
+	
 	fn render(&mut self, frame: &mut Frame) {
 		let content_width = u16::try_from(self.message.width()).unwrap_or(u16::MAX);
 		let content_height = u16::try_from(self.message.height()).unwrap_or(u16::MAX);

src/component/filesystem/action/count.rs

@@ -17,7 +17,7 @@ impl Action<FsLayer> for PushCountDigit {
 		if new_count > MAX_COUNT {
 			layer.registers.count = None;
 			
-			ActionResult::PushLayer(Box::new(MessageDialogLayer::generic_error(layer.dialog_y(), format!("Count is too large (> {MAX_COUNT}), it will be reset."))))
+			ActionResult::push_layer(MessageDialogLayer::error(layer.dialog_y(), format!("Count is too large (> {MAX_COUNT}), it will be reset.")))
 		} else {
 			layer.registers.count = Some(new_count);
 			ActionResult::Nothing

src/component/filesystem/action/file/create.rs

@@ -1,14 +1,12 @@
 use std::{fs, io};
 use std::path::{Path, PathBuf};
-use std::rc::Rc;
 
 use ratatui::style::Color;
 use slab_tree::NodeId;
 
 use crate::component::dialog::input::InputFieldDialogLayer;
 use crate::component::dialog::message::MessageDialogLayer;
-use crate::component::filesystem::action::file::{FileNode, get_selected_file};
-use crate::component::filesystem::event::FsLayerEvent;
+use crate::component::filesystem::action::file::{FileNode, get_selected_file, RefreshParentDirectoryAndSelectFile};
 use crate::component::filesystem::FsLayer;
 use crate::file::FileKind;
 use crate::state::action::{Action, ActionResult};
@@ -71,7 +69,7 @@ impl Action<FsLayer> for CreateDirectoryInSelectedDirectory {
 
 fn create_in_selected_directory<T: CreateEntry>(layer: &mut FsLayer) -> ActionResult {
 	if let Some(FileNode { node, path, .. }) = get_selected_file(layer).filter(|n| matches!(n.entry.kind(), FileKind::Directory)) {
-		ActionResult::PushLayer(Box::new(create_new_name_prompt::<T>(layer, path.to_owned(), node.node_id())))
+		ActionResult::push_layer(create_new_name_prompt::<T>(layer, path.to_owned(), node.node_id()))
 	} else {
 		ActionResult::Nothing
 	}
@@ -95,7 +93,7 @@ impl Action<FsLayer> for CreateDirectoryInParentOfSelectedEntry {
 
 fn create_in_parent_of_selected_file<T: CreateEntry>(layer: &mut FsLayer) -> ActionResult {
 	if let Some((parent_node_id, parent_path)) = get_parent_of_selected_file(layer) {
-		ActionResult::PushLayer(Box::new(create_new_name_prompt::<T>(layer, parent_path.to_owned(), parent_node_id)))
+		ActionResult::push_layer(create_new_name_prompt::<T>(layer, parent_path.to_owned(), parent_node_id))
 	} else {
 		ActionResult::Nothing
 	}
@@ -105,9 +103,9 @@ fn get_parent_of_selected_file(layer: &FsLayer) -> Option<(NodeId, &Path)> {
 	get_selected_file(layer).and_then(|n| { Some((n.node.parent_id()?, n.path.parent()?)) })
 }
 
-fn create_new_name_prompt<'b, T: CreateEntry>(layer: &FsLayer, parent_folder: PathBuf, view_node_id_to_refresh: NodeId) -> InputFieldDialogLayer<'b> {
+fn create_new_name_prompt<'b, T: CreateEntry>(layer: &FsLayer, parent_folder: PathBuf, parent_view_node_id: NodeId) -> InputFieldDialogLayer<'b> {
 	let y = layer.dialog_y();
-	let pending_events = Rc::clone(&layer.pending_events);
+	let events = layer.events();
 	
 	InputFieldDialogLayer::build()
 		.y(y)
@@ -115,25 +113,24 @@ fn create_new_name_prompt<'b, T: CreateEntry>(layer: &FsLayer, parent_folder: Pa
 		.color(Color::LightCyan, Color::Cyan)
 		.title(T::title())
 		.message(format!("Creating {} in {}", T::kind(), parent_folder.to_string_lossy()))
-		.build(Box::new(move |new_name| {
+		.on_confirm(move |new_name| {
 			if new_name.is_empty() {
 				return ActionResult::Nothing;
 			}
 			
 			let new_path = parent_folder.join(&new_name);
 			if new_path.exists() {
-				return ActionResult::PushLayer(Box::new(MessageDialogLayer::generic_error(y, "Something with this name already exists.")));
+				return ActionResult::push_layer(MessageDialogLayer::error(y, "Something with this name already exists."));
 			}
 			
 			match T::create(new_path) {
 				Ok(_) => {
-					FsLayerEvent::RefreshViewNodeChildren(view_node_id_to_refresh).enqueue(&pending_events);
-					FsLayerEvent::SelectViewNodeChildByFileName(view_node_id_to_refresh, new_name).enqueue(&pending_events);
+					events.enqueue(RefreshParentDirectoryAndSelectFile { parent_view_node_id, child_file_name: new_name });
 					ActionResult::PopLayer
 				}
 				Err(e) => {
-					ActionResult::PushLayer(Box::new(MessageDialogLayer::generic_error(y, format!("Could not create {}: {e}", T::kind()))))
+					ActionResult::push_layer(MessageDialogLayer::error(y, format!("Could not create {}: {e}", T::kind())))
 				}
 			}
-		}))
+		})
 }

src/component/filesystem/action/file/delete.rs

@@ -1,6 +1,5 @@
 use std::io;
 use std::path::{Path, PathBuf};
-use std::rc::Rc;
 use std::time::{Duration, Instant};
 
 use ratatui::style::Color;
@@ -9,18 +8,18 @@ use slab_tree::NodeId;
 
 use crate::component::dialog::message::MessageDialogLayer;
 use crate::component::filesystem::action::file::{FileNode, get_entry_kind_name, get_selected_file};
-use crate::component::filesystem::event::FsLayerEvent;
 use crate::component::filesystem::FsLayer;
 use crate::file::{FileEntry, FileKind};
 use crate::state::action::{Action, ActionResult};
 use crate::state::Environment;
+use crate::state::event::EventResult;
 
 pub struct DeleteSelectedEntry;
 
 impl Action<FsLayer> for DeleteSelectedEntry {
 	fn perform(&self, layer: &mut FsLayer, _environment: &Environment) -> ActionResult {
 		if let Some(FileNode { node, entry, path }) = get_selected_file(layer) {
-			ActionResult::PushLayer(Box::new(create_delete_confirmation_dialog(layer, node.node_id(), entry, path.to_owned())))
+			ActionResult::push_layer(create_delete_confirmation_dialog(layer, node.node_id(), entry, path.to_owned()))
 		} else {
 			ActionResult::Nothing
 		}
@@ -29,7 +28,7 @@ impl Action<FsLayer> for DeleteSelectedEntry {
 
 fn create_delete_confirmation_dialog<'a>(layer: &FsLayer, view_node_id: NodeId, entry: &FileEntry, path: PathBuf) -> MessageDialogLayer<'a> {
 	let y = layer.dialog_y();
-	let pending_events = Rc::clone(&layer.pending_events);
+	let events = layer.events();
 	
 	let total_files = if matches!(entry.kind(), FileKind::Directory) {
 		count_files(path.clone())
@@ -45,17 +44,17 @@ fn create_delete_confirmation_dialog<'a>(layer: &FsLayer, view_node_id: NodeId,
 			Line::from(format!("Permanently delete {}?", path.to_string_lossy())),
 			Line::from(format!("This will affect {}.", total_files.describe())),
 		])
-		.yes_no(Box::new(move || {
+		.yes_no(move || {
 			match delete_path_recursively(&path) {
 				Ok(_) => {
-					FsLayerEvent::DeleteViewNode(view_node_id).enqueue(&pending_events);
+					events.enqueue_fn(move |layer, _| EventResult::draw_if(layer.tree.delete_node(view_node_id)));
 					ActionResult::PopLayer
 				}
 				Err(e) => {
-					ActionResult::ReplaceLayer(Box::new(MessageDialogLayer::generic_error(y.saturating_add(1), e.to_string())))
+					ActionResult::replace_layer(MessageDialogLayer::error(y.saturating_add(1), e.to_string()))
 				}
 			}
-		}))
+		})
 }
 
 const MAX_COUNT_TIME: Duration = Duration::from_secs(5);

src/component/filesystem/action/file/edit.rs

@@ -8,11 +8,11 @@ use slab_tree::NodeRef;
 
 use crate::component::dialog::message::MessageDialogLayer;
 use crate::component::filesystem::action::file::{FileNode, get_selected_file};
-use crate::component::filesystem::event::FsLayerEvent;
 use crate::component::filesystem::FsLayer;
 use crate::component::filesystem::tree::FsTreeViewNode;
 use crate::state::action::{Action, ActionResult};
 use crate::state::Environment;
+use crate::state::event::EventResult;
 use crate::util::slab_tree::NodeRefExtensions;
 
 pub struct EditSelectedEntry;
@@ -34,12 +34,12 @@ fn open_default_editor(layer: &FsLayer, node: &NodeRef<FsTreeViewNode>, path: &P
 		.status();
 	
 	if status.is_err_and(|e| e.kind() == ErrorKind::NotFound) {
-		return ActionResult::PushLayer(Box::new(MessageDialogLayer::generic_error(layer.dialog_y(), format!("Default editor '{}' not found.", editor.to_string_lossy()))));
+		return ActionResult::push_layer(MessageDialogLayer::error(layer.dialog_y(), format!("Default editor '{}' not found.", editor.to_string_lossy())));
 	}
 	
 	// Refresh the parent directory, or the root node if this is the view root.
 	let node_id_to_refresh = node.parent_id().unwrap_or_else(|| node.node_id());
-	FsLayerEvent::RefreshViewNodeChildren(node_id_to_refresh).enqueue(&layer.pending_events);
+	layer.events().enqueue_fn(move |layer, _| EventResult::draw_if(layer.tree.refresh_children(node_id_to_refresh)));
 	
 	ActionResult::Redraw
 }

src/component/filesystem/action/file/mod.rs

@@ -1,11 +1,13 @@
 use std::io;
 use std::path::Path;
 
-use slab_tree::NodeRef;
+use slab_tree::{NodeId, NodeRef};
 
 use crate::component::filesystem::FsLayer;
 use crate::component::filesystem::tree::FsTreeViewNode;
 use crate::file::{FileEntry, FileKind};
+use crate::state::Environment;
+use crate::state::event::{Event, EventResult};
 
 pub use self::create::*;
 pub use self::delete::*;
@@ -18,7 +20,7 @@ mod edit;
 mod rename;
 
 fn get_selected_file(layer: &FsLayer) -> Option<FileNode> {
-	if let Some(node) = layer.selected_node() {
+	if let Some(node) = layer.tree.selected_node() {
 		if let Some(entry) = layer.tree.get_entry(&node) {
 			if let Some(path) = entry.path() {
 				return Some(FileNode { node, entry, path });
@@ -54,3 +56,19 @@ fn format_io_error(err: &io::Error) -> String {
 	str.push('.');
 	str
 }
+
+struct RefreshParentDirectoryAndSelectFile {
+	parent_view_node_id: NodeId,
+	child_file_name: String,
+}
+
+impl Event<FsLayer> for RefreshParentDirectoryAndSelectFile {
+	fn dispatch(&self, layer: &mut FsLayer, _environment: &Environment) -> EventResult {
+		if layer.tree.refresh_children(self.parent_view_node_id) {
+			layer.tree.select_child_node_by_name(self.parent_view_node_id, &self.child_file_name);
+			EventResult::Draw
+		} else {
+			EventResult::Nothing
+		}
+	}
+}

src/component/filesystem/action/file/rename.rs

@@ -1,15 +1,13 @@
 use io::ErrorKind;
 use std::{fs, io};
 use std::path::PathBuf;
-use std::rc::Rc;
 
 use ratatui::style::Color;
 use slab_tree::NodeRef;
 
 use crate::component::dialog::input::InputFieldDialogLayer;
 use crate::component::dialog::message::MessageDialogLayer;
-use crate::component::filesystem::action::file::{FileNode, format_io_error, get_entry_kind_name, get_selected_file};
-use crate::component::filesystem::event::FsLayerEvent;
+use crate::component::filesystem::action::file::{FileNode, format_io_error, get_entry_kind_name, get_selected_file, RefreshParentDirectoryAndSelectFile};
 use crate::component::filesystem::FsLayer;
 use crate::component::filesystem::tree::FsTreeViewNode;
 use crate::file::FileEntry;
@@ -24,7 +22,7 @@ pub struct RenameSelectedEntry {
 impl Action<FsLayer> for RenameSelectedEntry {
 	fn perform(&self, layer: &mut FsLayer, _environment: &Environment) -> ActionResult {
 		if let Some(FileNode { node, entry, path }) = get_selected_file(layer) {
-			ActionResult::PushLayer(Box::new(self.create_rename_dialog(layer, &node, entry, path.to_owned())))
+			ActionResult::push_layer(self.create_rename_dialog(layer, &node, entry, path.to_owned()))
 		} else {
 			ActionResult::Nothing
 		}
@@ -35,8 +33,8 @@ impl RenameSelectedEntry {
 	#[allow(clippy::wildcard_enum_match_arm)]
 	fn create_rename_dialog<'a, 'b>(&'a self, layer: &'a FsLayer, node: &'a NodeRef<FsTreeViewNode>, entry: &'a FileEntry, path: PathBuf) -> InputFieldDialogLayer<'b> {
 		let y = layer.dialog_y();
-		let parent_node_id = node.parent_id();
-		let pending_events = Rc::clone(&layer.pending_events);
+		let events = layer.events();
+		let parent_view_node_id = node.parent_id();
 		
 		InputFieldDialogLayer::build()
 			.y(y)
@@ -45,20 +43,19 @@ impl RenameSelectedEntry {
 			.title(format!("Rename {}", get_entry_kind_name(entry)))
 			.message(format!("Renaming {}", path.to_string_lossy()))
 			.initial_value(self.prefill.then(|| entry.name().str().to_owned()))
-			.build(Box::new(move |new_name| {
+			.on_confirm(move |new_name| {
 				match rename_file(&path, &new_name) {
 					Ok(_) => {
-						if let Some(parent_node_id) = parent_node_id {
-							FsLayerEvent::RefreshViewNodeChildren(parent_node_id).enqueue(&pending_events);
-							FsLayerEvent::SelectViewNodeChildByFileName(parent_node_id, new_name).enqueue(&pending_events);
+						if let Some(parent_view_node_id) = parent_view_node_id {
+							events.enqueue(RefreshParentDirectoryAndSelectFile { parent_view_node_id, child_file_name: new_name });
 						}
 						ActionResult::PopLayer
 					}
 					Err(e) => {
-						ActionResult::PushLayer(Box::new(MessageDialogLayer::generic_error(y.saturating_add(1), format_io_error(&e))))
+						ActionResult::push_layer(MessageDialogLayer::error(y.saturating_add(1), format_io_error(&e)))
 					}
 				}
-			}))
+			})
 	}
 }
 

src/component/filesystem/action/movement/expand_collapse.rs

@@ -1,14 +1,15 @@
 use slab_tree::NodeId;
 
-use crate::component::filesystem::action::movement::{get_simple_movement_target, MovementAction, perform_movement_with_count, SimpleMovementAction};
+use crate::component::filesystem::action::movement::{get_simple_movement_target, MovementAction, perform_movement_with_count_from_register, SimpleMovementAction};
 use crate::component::filesystem::FsLayer;
+use crate::component::filesystem::tree::FsTree;
 use crate::state::Environment;
 
 pub struct ExpandSelectedOr<M: SimpleMovementAction>(pub M);
 
 impl<M: SimpleMovementAction> MovementAction for ExpandSelectedOr<M> {
 	fn get_target(&self, layer: &mut FsLayer, _environment: &Environment) -> Option<NodeId> where Self: Sized {
-		Some(perform_action_or_movement::<M, _>(layer, FsLayer::expand))
+		Some(perform_action_or_movement::<M, _>(layer, FsTree::expand))
 	}
 }
 
@@ -16,16 +17,16 @@ pub struct CollapseSelectedOr<M: SimpleMovementAction>(pub M);
 
 impl<M: SimpleMovementAction> MovementAction for CollapseSelectedOr<M> {
 	fn get_target(&self, layer: &mut FsLayer, _environment: &Environment) -> Option<NodeId> where Self: Sized {
-		Some(perform_action_or_movement::<M, _>(layer, FsLayer::collapse))
+		Some(perform_action_or_movement::<M, _>(layer, FsTree::collapse))
 	}
 }
 
-fn perform_action_or_movement<M: SimpleMovementAction, F>(layer: &mut FsLayer, action: F) -> NodeId where F: Fn(&mut FsLayer, NodeId) -> bool {
-	perform_movement_with_count(layer, layer.registers.count, |layer, node_id| {
-		if action(layer, node_id) {
+fn perform_action_or_movement<M: SimpleMovementAction, F>(layer: &mut FsLayer, action: F) -> NodeId where F: Fn(&mut FsTree, NodeId) -> bool {
+	perform_movement_with_count_from_register(layer, |tree, node_id| {
+		if action(tree, node_id) {
 			Some(node_id)
 		} else {
-			get_simple_movement_target::<M>(layer, node_id)
+			get_simple_movement_target::<M>(tree, node_id)
 		}
 	})
 }

src/component/filesystem/action/movement/hierarchy_based.rs

@@ -1,8 +1,8 @@
 use slab_tree::{NodeId, NodeRef};
 
-use crate::component::filesystem::action::movement::{MovementAction, perform_movement_with_count, SimpleMovementAction};
+use crate::component::filesystem::action::movement::{MovementAction, perform_movement_with_count_from_register, SimpleMovementAction};
 use crate::component::filesystem::FsLayer;
-use crate::component::filesystem::tree::{FsTreeView, FsTreeViewNode};
+use crate::component::filesystem::tree::{FsTree, FsTreeView, FsTreeViewNode};
 use crate::state::Environment;
 use crate::util::slab_tree::NodeRefExtensions;
 
@@ -46,19 +46,17 @@ pub struct MoveOrTraverseUpParent;
 
 impl MovementAction for MoveOrTraverseUpParent {
 	fn get_target(&self, layer: &mut FsLayer, _environment: &Environment) -> Option<NodeId> where Self: Sized {
-		Some(perform_movement_with_count(layer, layer.registers.count, Self::get_target))
+		Some(perform_movement_with_count_from_register(layer, Self::get_target))
 	}
 }
 
 impl MoveOrTraverseUpParent {
-	fn get_target(layer: &mut FsLayer, node_id: NodeId) -> Option<NodeId> {
-		let view = &layer.tree.view;
-		
-		if let Some(node) = view.get(node_id) {
-			let target_node_id = <MoveToParent as SimpleMovementAction>::get_target(view, &node);
+	fn get_target(tree: &mut FsTree, node_id: NodeId) -> Option<NodeId> {
+		if let Some(node) = tree.view.get(node_id) {
+			let target_node_id = <MoveToParent as SimpleMovementAction>::get_target(&tree.view, &node);
 			if target_node_id.is_some() {
 				return target_node_id;
-			} else if let Some(target_node_id) = layer.traverse_up_root() {
+			} else if let Some(target_node_id) = tree.traverse_up_root() {
 				return Some(target_node_id)
 			}
 		}

src/component/filesystem/action/movement/line_based.rs

@@ -2,7 +2,7 @@ use slab_tree::{NodeId, NodeRef};
 
 use crate::component::filesystem::action::movement::{get_simple_movement_target, MovementAction, MoveToParent, perform_movement_with_count_from, SimpleMovementAction};
 use crate::component::filesystem::FsLayer;
-use crate::component::filesystem::tree::{FsTreeView, FsTreeViewNode};
+use crate::component::filesystem::tree::{FsTree, FsTreeView, FsTreeViewNode};
 use crate::state::Environment;
 
 /// Moves up `count` lines (1 line by default).
@@ -28,16 +28,15 @@ pub struct MoveToFirst;
 
 impl MovementAction for MoveToFirst {
 	fn get_target(&self, layer: &mut FsLayer, _environment: &Environment) -> Option<NodeId> where Self: Sized {
-		Some(Self::get_target(layer))
+		Some(Self::get_target(&mut layer.tree))
 	}
 }
 
 impl MoveToFirst {
-	fn get_target(layer: &mut FsLayer) -> NodeId where Self: Sized {
-		let view = &layer.tree.view;
-		let mut target_node_id = layer.selected_view_node_id;
+	fn get_target(tree: &mut FsTree) -> NodeId where Self: Sized {
+		let mut target_node_id = tree.selected_view_node_id;
 		
-		while let Some(node_id) = view.get(target_node_id).and_then(|node| <MoveToParent as SimpleMovementAction>::get_target(view, &node)) {
+		while let Some(node_id) = tree.view.get(target_node_id).and_then(|node| <MoveToParent as SimpleMovementAction>::get_target(&tree.view, &node)) {
 			target_node_id = node_id;
 		}
 		
@@ -50,7 +49,7 @@ pub struct MoveToLast;
 
 impl MovementAction for MoveToLast {
 	fn get_target(&self, layer: &mut FsLayer, _environment: &Environment) -> Option<NodeId> where Self: Sized {
-		let first_node_id = MoveToFirst::get_target(layer);
+		let first_node_id = MoveToFirst::get_target(&mut layer.tree);
 		let last_node_id = layer.tree.view.get_last_descendant_or_self(first_node_id);
 		Some(last_node_id)
 	}
@@ -63,9 +62,10 @@ pub struct MoveToLineOr<A: MovementAction>(pub A);
 impl<A: MovementAction> MovementAction for MoveToLineOr<A> {
 	fn get_target(&self, layer: &mut FsLayer, environment: &Environment) -> Option<NodeId> where Self: Sized {
 		if let Some(line_number) = layer.registers.count {
+			let tree = &mut layer.tree;
 			let line_index = Some(line_number.saturating_sub(1));
-			let first_node_id = MoveToFirst::get_target(layer);
-			Some(perform_movement_with_count_from(layer, line_index, first_node_id, get_simple_movement_target::<MoveDown>))
+			let first_node_id = MoveToFirst::get_target(tree);
+			Some(perform_movement_with_count_from(tree, line_index, first_node_id, get_simple_movement_target::<MoveDown>))
 		} else {
 			self.0.get_target(layer, environment)
 		}

src/component/filesystem/action/movement/mod.rs

@@ -1,7 +1,7 @@
 use slab_tree::{NodeId, NodeRef};
 
 use crate::component::filesystem::FsLayer;
-use crate::component::filesystem::tree::{FsTreeView, FsTreeViewNode};
+use crate::component::filesystem::tree::{FsTree, FsTreeView, FsTreeViewNode};
 use crate::state::action::{Action, ActionResult};
 use crate::state::Environment;
 
@@ -25,7 +25,7 @@ pub trait MovementAction {
 impl<T: MovementAction> Action<FsLayer> for T {
 	fn perform(&self, layer: &mut FsLayer, environment: &Environment) -> ActionResult {
 		if let Some(target_node_id) = self.get_target(layer, environment) {
-			layer.selected_view_node_id = target_node_id;
+			layer.tree.selected_view_node_id = target_node_id;
 			ActionResult::Draw
 		} else {
 			ActionResult::Nothing
@@ -33,15 +33,19 @@ impl<T: MovementAction> Action<FsLayer> for T {
 	}
 }
 
-fn perform_movement_with_count<F>(layer: &mut FsLayer, count: Option<usize>, get_target: F) -> NodeId where F: Fn(&mut FsLayer, NodeId) -> Option<NodeId> {
-	perform_movement_with_count_from(layer, count, layer.selected_view_node_id, get_target)
+fn perform_movement_with_count_from_register<F>(layer: &mut FsLayer, get_target: F) -> NodeId where F: Fn(&mut FsTree, NodeId) -> Option<NodeId> {
+	perform_movement_with_count(&mut layer.tree, layer.registers.count, get_target)
 }
 
-fn perform_movement_with_count_from<F>(layer: &mut FsLayer, count: Option<usize>, start_node_id: NodeId, get_target: F) -> NodeId where F: Fn(&mut FsLayer, NodeId) -> Option<NodeId> {
+fn perform_movement_with_count<F>(tree: &mut FsTree, count: Option<usize>, get_target: F) -> NodeId where F: Fn(&mut FsTree, NodeId) -> Option<NodeId> {
+	perform_movement_with_count_from(tree, count, tree.selected_view_node_id, get_target)
+}
+
+fn perform_movement_with_count_from<F>(tree: &mut FsTree, count: Option<usize>, start_node_id: NodeId, get_target: F) -> NodeId where F: Fn(&mut FsTree, NodeId) -> Option<NodeId> {
 	let mut target_node_id = start_node_id;
 	
 	for _ in 0..count.unwrap_or(1) {
-		if let Some(node_id) = get_target(layer, target_node_id) {
+		if let Some(node_id) = get_target(tree, target_node_id) {
 			target_node_id = node_id;
 		} else {
 			break;
@@ -57,11 +61,10 @@ pub trait SimpleMovementAction {
 
 impl<T: SimpleMovementAction> MovementAction for T {
 	fn get_target(&self, layer: &mut FsLayer, _environment: &Environment) -> Option<NodeId> where Self: Sized {
-		Some(perform_movement_with_count(layer, layer.registers.count, get_simple_movement_target::<T>))
+		Some(perform_movement_with_count_from_register(layer, get_simple_movement_target::<T>))
 	}
 }
 
-fn get_simple_movement_target<T: SimpleMovementAction>(layer: &mut FsLayer, node_id: NodeId) -> Option<NodeId> {
-	let view = &layer.tree.view;
-	view.get(node_id).and_then(|node| T::get_target(view, &node))
+fn get_simple_movement_target<T: SimpleMovementAction>(tree: &mut FsTree, node_id: NodeId) -> Option<NodeId> {
+	tree.view.get(node_id).and_then(|node| T::get_target(&tree.view, &node))
 }

src/component/filesystem/action/movement/with_count.rs

@@ -37,7 +37,7 @@ impl<A: SimpleMovementAction + 'static, C: MovementCount> MovementWithCountFacto
 impl<A: SimpleMovementAction, C: MovementCount> MovementAction for MovementWithCount<A, C> {
 	fn get_target(&self, layer: &mut FsLayer, environment: &Environment) -> Option<NodeId> where Self: Sized {
 		let count = self.0.get_count(layer.registers.count, environment);
-		Some(perform_movement_with_count(layer, Some(count), get_simple_movement_target::<A>))
+		Some(perform_movement_with_count(&mut layer.tree, Some(count), get_simple_movement_target::<A>))
 	}
 }
 

src/component/filesystem/action/tree/expand_collapse.rs

@@ -5,6 +5,7 @@ use slab_tree::NodeId;
 
 use crate::component::dialog::message::MessageDialogLayer;
 use crate::component::filesystem::FsLayer;
+use crate::component::filesystem::tree::FsTree;
 use crate::state::action::{Action, ActionResult};
 use crate::state::Environment;
 
@@ -19,19 +20,19 @@ impl Action<FsLayer> for ExpandCollapse {
 			return ActionResult::Nothing;
 		}
 		
-		if layer.expand_or_collapse(layer.selected_view_node_id) {
+		if layer.tree.expand_or_collapse(layer.tree.selected_view_node_id) {
 			if depth > 1 {
-				if let Some(node) = layer.selected_node() {
+				if let Some(node) = layer.tree.selected_node() {
 					if node.data().is_expanded() {
 						let child_node_ids = node.children().map(|node| node.node_id()).collect();
 						let remaining_depth = depth.saturating_sub(1);
-						if !expand_children_to_depth(layer, child_node_ids, remaining_depth) {
-							return ActionResult::PushLayer(Box::new(MessageDialogLayer::build()
+						if !expand_children_to_depth(&mut layer.tree, child_node_ids, remaining_depth) {
+							return ActionResult::push_layer(MessageDialogLayer::build()
 								.y(layer.dialog_y())
 								.color(Color::LightYellow)
 								.title("Expansion Stopped")
 								.message(format!("Expansion was taking more than {} seconds, stopping now.", MAX_EXPANSION_TIME.as_secs()))
-								.ok()));
+								.ok());
 						}
 					}
 				}
@@ -46,7 +47,7 @@ impl Action<FsLayer> for ExpandCollapse {
 
 const MAX_EXPANSION_TIME: Duration = Duration::from_secs(10);
 
-fn expand_children_to_depth(layer: &mut FsLayer, mut child_node_ids: Vec<NodeId>, max_depth: usize) -> bool {
+fn expand_children_to_depth(tree: &mut FsTree, mut child_node_ids: Vec<NodeId>, max_depth: usize) -> bool {
 	let start_time = Instant::now();
 	let mut current_pass_node_ids = Vec::new();
 	
@@ -55,8 +56,8 @@ fn expand_children_to_depth(layer: &mut FsLayer, mut child_node_ids: Vec<NodeId>
 		
 		for node_id in &current_pass_node_ids {
 			let node_id = *node_id;
-			layer.tree.expand(node_id);
-			get_child_node_ids(layer, node_id, &mut child_node_ids);
+			tree.expand(node_id);
+			get_child_node_ids(tree, node_id, &mut child_node_ids);
 			
 			if start_time.elapsed() >= MAX_EXPANSION_TIME {
 				return false;
@@ -67,8 +68,8 @@ fn expand_children_to_depth(layer: &mut FsLayer, mut child_node_ids: Vec<NodeId>
 	true
 }
 
-fn get_child_node_ids(layer: &FsLayer, node_id: NodeId, output_node_ids: &mut Vec<NodeId>) {
-	if let Some(node) = layer.tree.view.get(node_id) {
+fn get_child_node_ids(tree: &FsTree, node_id: NodeId, output_node_ids: &mut Vec<NodeId>) {
+	if let Some(node) = tree.get_view_node(node_id) {
 		for child in node.children() {
 			output_node_ids.push(child.node_id());
 		}

src/component/filesystem/action/tree/refresh.rs

@@ -6,7 +6,7 @@ pub struct RefreshChildrenOfSelected;
 
 impl Action<FsLayer> for RefreshChildrenOfSelected {
 	fn perform(&self, layer: &mut FsLayer, _environment: &Environment) -> ActionResult {
-		if layer.refresh_children(layer.selected_view_node_id) {
+		if layer.tree.refresh_children(layer.tree.selected_view_node_id) {
 			ActionResult::Draw
 		} else {
 			ActionResult::Nothing

src/component/filesystem/event.rs

@@ -1,62 +0,0 @@
-use std::cell::RefCell;
-use std::rc::Rc;
-
-use slab_tree::NodeId;
-
-use crate::component::filesystem::FsLayer;
-
-pub type FsLayerPendingEvents = Rc<RefCell<Vec<FsLayerEvent>>>;
-
-pub enum FsLayerEvent {
-	RefreshViewNodeChildren(NodeId),
-	SelectViewNodeChildByFileName(NodeId, String),
-	DeleteViewNode(NodeId),
-}
-
-impl FsLayerEvent {
-	pub fn enqueue(self, pending_events: &FsLayerPendingEvents) -> bool {
-		if let Ok(mut pending_events) = pending_events.try_borrow_mut() {
-			pending_events.push(self);
-			true
-		} else {
-			false
-		}
-	}
-	
-	pub fn handle(self, layer: &mut FsLayer) {
-		match self {
-			Self::RefreshViewNodeChildren(view_node_id) => handle_refresh_view_node_children(layer, view_node_id),
-			Self::SelectViewNodeChildByFileName(parent_view_node_id, child_file_name) => handle_select_view_node_child_by_name(layer, parent_view_node_id, child_file_name.as_str()),
-			Self::DeleteViewNode(view_node_id) => handle_delete_view_node(layer, view_node_id),
-		}
-	}
-}
-
-fn handle_refresh_view_node_children(layer: &mut FsLayer, view_node_id: NodeId) {
-	layer.refresh_children(view_node_id);
-}
-
-fn handle_select_view_node_child_by_name(layer: &mut FsLayer, parent_view_node_id: NodeId, child_file_name: &str) {
-	layer.tree.expand(parent_view_node_id);
-	
-	if let Some(parent_node) = layer.tree.view.get(parent_view_node_id) {
-		for child_node in parent_node.children() {
-			if layer.tree.get_entry(&child_node).is_some_and(|entry| entry.name().str() == child_file_name) {
-				layer.selected_view_node_id = child_node.node_id();
-				return;
-			}
-		}
-	}
-}
-
-fn handle_delete_view_node(layer: &mut FsLayer, view_node_id: NodeId) {
-	let view = &mut layer.tree.view;
-	
-	if layer.selected_view_node_id == view_node_id {
-		layer.selected_view_node_id = view.get_node_below_id(view_node_id).or_else(|| view.get_node_above_id(view_node_id)).unwrap_or_else(|| view.root_id());
-	}
-	
-	if let Some(view_node) = view.remove(view_node_id) {
-		layer.tree.model.remove(view_node.model_node_id());
-	}
-}

src/component/filesystem/mod.rs

@@ -1,32 +1,27 @@
-use std::cell::RefCell;
 use std::path::Path;
-use std::rc::Rc;
 
-use slab_tree::{NodeId, NodeRef};
-
-use crate::component::filesystem::event::FsLayerPendingEvents;
 use crate::component::filesystem::registers::FsTreeRegisters;
-use crate::component::filesystem::tree::{FsTree, FsTreeViewNode};
+use crate::component::filesystem::tree::FsTree;
 use crate::file::FileOwnerNameCache;
 use crate::input::keymap::{KeyBinding, KeyMapLookupResult};
 use crate::state::action::ActionResult;
 use crate::state::Environment;
+use crate::state::event::{EventQueue, EventResult};
 use crate::state::layer::Layer;
 use crate::state::view::Frame;
 
 mod action;
-mod event;
 mod render;
 mod tree;
 mod registers;
 
 pub struct FsLayer {
 	pub tree: FsTree,
-	pub selected_view_node_id: NodeId,
+	tree_structure_version: u32,
 	pub registers: FsTreeRegisters,
 	cursor_y: u16,
 	pending_keys: Vec<KeyBinding>,
-	pending_events: FsLayerPendingEvents,
+	event_queue: EventQueue<FsLayer>,
 	file_owner_name_cache: FileOwnerNameCache,
 	column_width_cache: Option<ColumnWidths>,
 }
@@ -36,70 +31,25 @@ impl FsLayer {
 		// Initialize action map early in case it errors.
 		let _ = *action::ACTION_MAP;
 		
-		let mut tree = FsTree::with_root_path(root_path);
-		let root_id = tree.view.root_id();
-		
-		tree.expand(root_id);
-		
 		Self {
-			tree,
-			selected_view_node_id: root_id,
+			tree: FsTree::with_root_path(root_path),
+			tree_structure_version: 0,
 			cursor_y: 0,
 			registers: FsTreeRegisters::new(),
 			pending_keys: Vec::new(),
-			pending_events: Rc::new(RefCell::new(Vec::new())),
+			event_queue: EventQueue::new(),
 			file_owner_name_cache: FileOwnerNameCache::new(),
 			column_width_cache: None,
 		}
 	}
 	
+	pub fn events(&self) -> EventQueue<Self> {
+		self.event_queue.rc_clone()
+	}
+	
 	pub const fn dialog_y(&self) -> u16 {
 		self.cursor_y.saturating_add(1)
 	}
-	
-	pub fn selected_node(&self) -> Option<NodeRef<FsTreeViewNode>> {
-		return self.tree.view.get(self.selected_view_node_id);
-	}
-	
-	pub fn expand(&mut self, view_node_id: NodeId) -> bool {
-		let result = self.tree.expand(view_node_id);
-		tree_structure_changed_if_true(self, result)
-	}
-	
-	pub fn collapse(&mut self, view_node_id: NodeId) -> bool {
-		let result = self.tree.collapse(view_node_id);
-		tree_structure_changed_if_true(self, result)
-	}
-	
-	pub fn expand_or_collapse(&mut self, view_node_id: NodeId) -> bool {
-		let result = self.tree.expand_or_collapse(view_node_id);
-		tree_structure_changed_if_true(self, result)
-	}
-	
-	pub fn refresh_children(&mut self, view_node_id: NodeId) -> bool {
-		let result = self.tree.refresh_children(view_node_id);
-		if result && self.selected_node().is_none() {
-			self.selected_view_node_id = view_node_id;
-		}
-		tree_structure_changed_if_true(self, result)
-	}
-	
-	pub fn traverse_up_root(&mut self) -> Option<NodeId> {
-		let new_root_id = self.tree.traverse_up_root();
-		tree_structure_changed_if_true(self, new_root_id.is_some());
-		new_root_id
-	}
-}
-
-fn tree_structure_changed(layer: &mut FsLayer) {
-	layer.column_width_cache.take();
-}
-
-fn tree_structure_changed_if_true(layer: &mut FsLayer, result: bool) -> bool {
-	if result {
-		tree_structure_changed(layer);
-	}
-	result
 }
 
 impl Layer for FsLayer {
@@ -133,9 +83,14 @@ impl Layer for FsLayer {
 		}
 	}
 	
+	fn handle_events(&mut self, environment: &Environment) -> EventResult {
+		self.event_queue.take().into_iter().fold(EventResult::Nothing, |result, event| result.merge(event.dispatch(self, environment)))
+	}
+	
 	fn render(&mut self, frame: &mut Frame) {
-		for event in self.pending_events.take() {
-			event.handle(self);
+		if self.tree_structure_version != self.tree.structure_version() {
+			self.tree_structure_version = self.tree.structure_version();
+			self.column_width_cache.take();
 		}
 		
 		render::render(self, frame);

src/component/filesystem/render/mod.rs

@@ -24,7 +24,7 @@ pub fn render(layer: &mut FsLayer, frame: &mut Frame) {
 	let column_widths = get_or_update_column_widths(layer, size.width);
 	let file_owner_name_cache = &mut layer.file_owner_name_cache;
 	
-	let (rows, cursor_y) = collect_displayed_rows(&layer.tree, layer.selected_view_node_id, size.height as usize);
+	let (rows, cursor_y) = collect_displayed_rows(&layer.tree, layer.tree.selected_view_node_id, size.height as usize);
 	layer.cursor_y = cursor_y;
 	
 	frame.render_widget(Clear, size);
@@ -63,7 +63,7 @@ fn collect_displayed_rows(tree: &FsTree, selected_node_id: NodeId, terminal_rows
 	let mut displayed_rows = Vec::with_capacity(terminal_rows);
 	let mut cursor_y: u16 = 0;
 	
-	if let Some(middle_node) = tree.view.get(selected_node_id).or_else(|| tree.view.root()) {
+	if let Some(middle_node) = tree.selected_node().or_else(|| tree.view.root()) {
 		let middle_node_id = middle_node.node_id();
 		
 		displayed_rows.push(NodeRow::from(&middle_node, tree, middle_node_id == selected_node_id));

src/component/filesystem/tree/mod.rs

@@ -13,16 +13,39 @@ mod model;
 mod view;
 
 pub struct FsTree {
-	pub model: FsTreeModel,
+	model: FsTreeModel,
 	pub view: FsTreeView,
+	pub selected_view_node_id: NodeId,
+	structure_version: u32,
 }
 
 impl FsTree {
 	pub fn with_root_path(path: &Path) -> Self {
 		let model = FsTreeModel::with_root_path(path);
 		let view = FsTreeView::from_model_root(&model);
+		let root_id = view.root_id();
 		
-		Self { model, view }
+		let mut tree = Self {
+			model,
+			view,
+			selected_view_node_id: root_id,
+			structure_version: 0,
+		};
+		
+		tree.expand(root_id);
+		tree
+	}
+	
+	pub const fn structure_version(&self) -> u32 {
+		self.structure_version
+	}
+	
+	pub fn selected_node(&self) -> Option<NodeRef<FsTreeViewNode>> {
+		return self.view.get(self.selected_view_node_id);
+	}
+	
+	pub fn get_view_node(&self, view_node_id: NodeId) -> Option<NodeRef<FsTreeViewNode>> {
+		self.view.get(view_node_id)
 	}
 	
 	pub fn get_entry(&self, node: &NodeRef<FsTreeViewNode>) -> Option<&FileEntry> {
@@ -32,26 +55,79 @@ impl FsTree {
 	}
 	
 	pub fn expand(&mut self, view_node_id: NodeId) -> bool {
-		self.view.expand(view_node_id, &mut self.model)
+		let result = self.view.expand(view_node_id, &mut self.model);
+		self.structure_changed_if_true(result)
 	}
 	
 	pub fn collapse(&mut self, view_node_id: NodeId) -> bool {
-		self.view.collapse(view_node_id)
+		let result = self.view.collapse(view_node_id);
+		self.structure_changed_if_true(result)
 	}
 	
 	pub fn expand_or_collapse(&mut self, view_node_id: NodeId) -> bool {
-		self.view.expand_or_collapse(view_node_id, &mut self.model)
+		let result = self.view.expand_or_collapse(view_node_id, &mut self.model);
+		self.structure_changed_if_true(result)
 	}
 	
 	pub fn traverse_up_root(&mut self) -> Option<NodeId> {
-		self.view.traverse_up_root(&mut self.model)
+		let new_root_id = self.view.traverse_up_root(&mut self.model);
+		self.structure_changed_if(new_root_id, Option::is_some)
 	}
 	
 	pub fn refresh_children(&mut self, view_node_id: NodeId) -> bool {
 		if let Some(view_node) = self.view.get(view_node_id) {
-			self.model.refresh_children(view_node.data().model_node_id()) && self.view.refresh_children(view_node_id, &self.model)
+			let result = self.model.refresh_children(view_node.data().model_node_id()) && self.view.refresh_children(view_node_id, &self.model);
+			if result && self.selected_node().is_none() {
+				self.selected_view_node_id = view_node_id;
+			}
+			self.structure_changed_if_true(result)
 		} else {
 			false
 		}
 	}
+	
+	pub fn select_child_node_by_name(&mut self, parent_view_node_id: NodeId, child_file_name: &str) -> bool {
+		self.expand(parent_view_node_id);
+		
+		if let Some(parent_node) = self.view.get(parent_view_node_id) {
+			for child_node in parent_node.children() {
+				if self.get_entry(&child_node).is_some_and(|entry| entry.name().str() == child_file_name) {
+					self.selected_view_node_id = child_node.node_id();
+					return true;
+				}
+			}
+		}
+		
+		false
+	}
+	
+	pub fn delete_node(&mut self, view_node_id: NodeId) -> bool {
+		let view = &mut self.view;
+		
+		if self.selected_view_node_id == view_node_id {
+			self.selected_view_node_id = view.get_node_below_id(view_node_id).or_else(|| view.get_node_above_id(view_node_id)).unwrap_or_else(|| view.root_id());
+		}
+		
+		if let Some(view_node) = view.remove(view_node_id) {
+			self.model.remove(view_node.model_node_id());
+			true
+		} else {
+			false
+		}
+	}
+	
+	fn structure_changed(&mut self) {
+		self.structure_version = self.structure_version.wrapping_add(1);
+	}
+	
+	fn structure_changed_if<T, F>(&mut self, result: T, predicate: F) -> T where F: FnOnce(&T) -> bool {
+		if predicate(&result) {
+			self.structure_changed();
+		}
+		result
+	}
+	
+	fn structure_changed_if_true(&mut self, result: bool) -> bool {
+		self.structure_changed_if(result, |result| *result)
+	}
 }

src/component/input/overlay.rs

@@ -1,12 +1,16 @@
+use std::cmp::min;
+
 use crossterm::event::{KeyCode, KeyModifiers};
 use ratatui::layout::Rect;
 use ratatui::style::{Color, Style};
+use ratatui::text::Span;
 use ratatui::widgets::Paragraph;
 
 use crate::component::input::InputField;
 use crate::input::keymap::KeyBinding;
 use crate::state::action::ActionResult;
 use crate::state::Environment;
+use crate::state::event::EventResult;
 use crate::state::layer::Layer;
 use crate::state::view::Frame;
 
@@ -17,12 +21,10 @@ pub struct InputFieldOverlayLayer<'a> {
 }
 
 impl<'a> InputFieldOverlayLayer<'a> {
-	pub fn new(read_only_prefix: &'a str, confirm_action: Box<dyn Fn(String) -> ActionResult>) -> Self {
-		Self {
-			field: InputField::new(),
-			read_only_prefix,
-			confirm_action,
-		}
+	pub fn new<F>(read_only_prefix: &'a str, confirm_action: F) -> Self where F: Fn(String) -> ActionResult + 'static {
+		let field = InputField::new();
+		let confirm_action = Box::new(confirm_action);
+		Self { field, read_only_prefix, confirm_action }
 	}
 }
 
@@ -53,6 +55,10 @@ impl<'a> Layer for InputFieldOverlayLayer<'a> {
 		}
 	}
 	
+	fn handle_events(&mut self, _environment: &Environment) -> EventResult {
+		EventResult::Nothing
+	}
+	
 	fn render(&mut self, frame: &mut Frame) {
 		let size = frame.size();
 		if size.width < 1 || size.height < 1 {
@@ -62,17 +68,22 @@ impl<'a> Layer for InputFieldOverlayLayer<'a> {
 		let x = size.x;
 		let y = size.bottom().saturating_sub(1);
 		
-		let prefix_style = Style::new()
-			.fg(Color::Black)
-			.bg(Color::LightYellow);
+		let prefix_text = Span::from(self.read_only_prefix);
+		let prefix_width = min(u16::try_from(prefix_text.width()).unwrap_or(u16::MAX), size.width.saturating_sub(2));
 		
-		let prefix_paragraph = Paragraph::new(self.read_only_prefix)
-			.style(prefix_style);
+		if prefix_width > 0 {
+			let prefix_style = Style::new()
+				.fg(Color::Black)
+				.bg(Color::LightYellow);
+			
+			let prefix_paragraph = Paragraph::new(self.read_only_prefix)
+				.style(prefix_style);
+			
+			frame.render_widget(prefix_paragraph, Rect { x, y, width: prefix_width, height: 1 });
+		}
 		
-		frame.render_widget(prefix_paragraph, Rect { x, y, width: 1, height: 1 });
-		
-		if size.width > 1 {
-			self.field.render(frame, x.saturating_add(1), y, size.width.saturating_sub(1), Color::LightYellow, Color::Yellow);
+		if size.width > prefix_width {
+			self.field.render(frame, x.saturating_add(prefix_width), y, size.width.saturating_sub(prefix_width), Color::LightYellow, Color::Yellow);
 		}
 	}
 }

src/state/action.rs

@@ -22,4 +22,12 @@ impl ActionResult {
 			Self::Nothing
 		}
 	}
+	
+	pub fn push_layer<T>(layer: T) -> Self where T: Layer + 'static {
+		Self::PushLayer(Box::new(layer))
+	}
+	
+	pub fn replace_layer<T>(layer: T) -> Self where T: Layer + 'static {
+		Self::ReplaceLayer(Box::new(layer))
+	}
 }

src/state/event.rs

@@ -0,0 +1,72 @@
+use std::cell::RefCell;
+use std::rc::Rc;
+
+use crate::state::Environment;
+
+pub trait Event<L> {
+	fn dispatch(&self, layer: &mut L, environment: &Environment) -> EventResult;
+}
+
+impl<L, F> Event<L> for F where F: Fn(& mut L, &Environment) -> EventResult {
+	fn dispatch(&self, layer: &mut L, environment: &Environment) -> EventResult {
+		self(layer, environment)
+	}
+}
+
+pub struct EventQueue<L> {
+	events: Rc<RefCell<Vec<Box<dyn Event<L>>>>>
+}
+
+impl<L> EventQueue<L> {
+	pub fn new() -> Self {
+		Self { events: Rc::new(RefCell::new(Vec::new())) }
+	}
+	
+	pub fn rc_clone(&self) -> Self {
+		Self { events: Rc::clone(&self.events) }
+	}
+	
+	pub fn enqueue<E: Event<L> + 'static>(&self, event: E) -> bool {
+		if let Ok(mut events) = self.events.try_borrow_mut() {
+			events.push(Box::new(event));
+			true
+		} else {
+			false
+		}
+	}
+	
+	pub fn enqueue_fn<F>(&self, event: F) -> bool where F: Fn(&mut L, &Environment) -> EventResult + 'static {
+		self.enqueue(event)
+	}
+	
+	pub fn take(&self) -> Vec<Box<dyn Event<L>>> {
+		self.events.take()
+	}
+}
+
+#[derive(Copy, Clone, Eq, PartialEq)]
+pub enum EventResult {
+	Nothing,
+	Draw,
+	Redraw,
+}
+
+impl EventResult {
+	pub const fn draw_if(condition: bool) -> Self {
+		if condition {
+			Self::Draw
+		} else {
+			Self::Nothing
+		}
+	}
+	
+	pub fn merge(self, other: Self) -> Self {
+		if self == Self::Redraw || other == Self::Redraw {
+			Self::Redraw
+		} else if self == Self::Draw || other == Self::Draw {
+			Self::Draw
+		} else {
+			Self::Nothing
+		}
+	}
+}

src/state/layer.rs

@@ -1,9 +1,11 @@
 use crate::input::keymap::KeyBinding;
 use crate::state::action::ActionResult;
 use crate::state::Environment;
+use crate::state::event::EventResult;
 use crate::state::view::Frame;
 
 pub trait Layer {
 	fn handle_input(&mut self, environment: &Environment, key_binding: KeyBinding) -> ActionResult;
+	fn handle_events(&mut self, environment: &Environment) -> EventResult;
 	fn render(&mut self, frame: &mut Frame);
 }

src/state/mod.rs

@@ -3,6 +3,7 @@ use std::path::Path;
 use crate::component::filesystem::FsLayer;
 use crate::input::keymap::KeyBinding;
 use crate::state::action::ActionResult;
+use crate::state::event::EventResult;
 use crate::state::layer::Layer;
 use crate::state::view::Frame;
 
@@ -10,6 +11,7 @@ pub use self::environment::Environment;
 
 mod environment;
 pub mod action;
+pub mod event;
 pub mod layer;
 pub mod view;
 
@@ -26,8 +28,12 @@ impl State {
 		}
 	}
 	
+	pub fn handle_events(&mut self) -> EventResult {
+		self.layers.iter_mut().fold(EventResult::Nothing, |result, layer| result.merge(layer.handle_events(&self.environment)))
+	}
+	
 	pub fn handle_input(&mut self, key_binding: KeyBinding) -> ActionResult {
-		self.layers.last_mut().map(|layer| layer.handle_input(&self.environment, key_binding)).unwrap_or(ActionResult::Nothing)
+		self.layers.last_mut().map_or(ActionResult::Nothing, |layer| layer.handle_input(&self.environment, key_binding))
 	}
 	
 	pub fn handle_resize(&mut self, width: u16, height: u16) {

src/state/view.rs

@@ -10,6 +10,7 @@ use ratatui::widgets::{StatefulWidget, Widget};
 
 pub struct View {
 	term: Terminal<CrosstermBackend<Stdout>>,
+	render_request: RenderRequest,
 }
 
 impl View {
@@ -22,7 +23,7 @@ impl View {
 		term.hide_cursor()?;
 		term.clear()?;
 		
-		Ok(Self { term })
+		Ok(Self { term, render_request: RenderRequest::Draw })
 	}
 	
 	pub fn restore_terminal_on_panic() {
@@ -45,11 +46,34 @@ impl View {
 		self.term.size()
 	}
 	
-	pub fn clear(&mut self) -> io::Result<()> {
-		self.term.clear()
+	pub fn set_dirty(&mut self, full_redraw: bool) {
+		let new_request = if full_redraw {
+			RenderRequest::Redraw
+		} else {
+			RenderRequest::Draw
+		};
+		
+		self.render_request = self.render_request.merge(new_request);
 	}
 	
-	pub fn render<R>(&mut self, renderer: R) -> io::Result<CompletedFrame> where R: FnOnce(&mut Frame) {
+	pub fn render<R>(&mut self, renderer: R) -> io::Result<()> where R: FnOnce(&mut Frame) {
+		match self.render_request.consume() {
+			RenderRequest::Skip => {}
+			
+			RenderRequest::Draw => {
+				self.draw(renderer)?;
+			}
+			
+			RenderRequest::Redraw => {
+				self.term.clear()?;
+				self.draw(renderer)?;
+			}
+		}
+		
+		Ok(())
+	}
+	
+	fn draw<R>(&mut self, renderer: R) -> io::Result<CompletedFrame> where R: FnOnce(&mut Frame) {
 		self.term.draw(|frame| {
 			let mut frame = Frame::new(frame);
 			renderer(&mut frame);
@@ -58,6 +82,29 @@ impl View {
 	}
 }
 
+#[derive(Copy, Clone, Eq, PartialEq)]
+enum RenderRequest {
+	Skip,
+	Draw,
+	Redraw,
+}
+
+impl RenderRequest {
+	fn merge(self, other: Self) -> Self {
+		if self == Self::Redraw || other == Self::Redraw {
+			Self::Redraw
+		} else if self == Self::Draw || other == Self::Draw {
+			Self::Draw
+		} else {
+			Self::Skip
+		}
+	}
+	
+	fn consume(&mut self) -> Self {
+		std::mem::replace(self, Self::Skip)
+	}
+}
+
 pub struct Frame<'a, 'b> {
 	inner: &'a mut ratatui::Frame<'b, CrosstermBackend<Stdout>>,
 	cursor: Option<(u16, u16)>,