Add support for persistent storage of panel layouts, sizes, and active tabs (#4017)

* Add persistence to panel layouts

* Fix and persist the Window > Focus Document mode

* Add a Window > Reset Workspace action

* workspace_layout.json -> workspace_layout.ron

* Fix native app hole punch

* Cleanup review pass

desktop/src/app.rs

@@ -21,6 +21,7 @@ use crate::persist::PersistentData;
 use crate::preferences;
 use crate::render::{RenderError, RenderState};
 use crate::window::Window;
+use crate::workspace_layout;
 use crate::wrapper::messages::{DesktopFrontendMessage, DesktopWrapperMessage, InputMessage, MouseKeys, MouseState, Preferences};
 use crate::wrapper::{DesktopWrapper, NodeGraphExecutionResult, WgpuContext, serialize_frontend_messages};
 
@@ -304,6 +305,15 @@ impl App {
 				let message = DesktopWrapperMessage::LoadPreferences { preferences };
 				responses.push(message);
 			}
+			DesktopFrontendMessage::PersistenceWriteWorkspaceLayout { workspace_layout: layout } => {
+				workspace_layout::write(&layout);
+			}
+			DesktopFrontendMessage::PersistenceLoadWorkspaceLayout => {
+				if let Some(workspace_layout) = workspace_layout::read() {
+					let message = DesktopWrapperMessage::LoadWorkspaceLayout { workspace_layout };
+					responses.push(message);
+				}
+			}
 			DesktopFrontendMessage::PersistenceLoadCurrentDocument => {
 				if let Some((id, document)) = self.persistent_data.current_document() {
 					let message = DesktopWrapperMessage::LoadDocument {

desktop/src/consts.rs

@@ -9,6 +9,7 @@ pub(crate) const APP_DIRECTORY_NAME: &str = "Graphite";
 pub(crate) const APP_LOCK_FILE_NAME: &str = "instance.lock";
 pub(crate) const APP_STATE_FILE_NAME: &str = "state.ron";
 pub(crate) const APP_PREFERENCES_FILE_NAME: &str = "preferences.ron";
+pub(crate) const APP_WORKSPACE_LAYOUT_FILE_NAME: &str = "workspace_layout.ron";
 pub(crate) const APP_DOCUMENTS_DIRECTORY_NAME: &str = "documents";
 
 // CEF configuration constants

desktop/src/lib.rs

@@ -20,6 +20,7 @@ mod persist;
 mod preferences;
 mod render;
 mod window;
+mod workspace_layout;
 
 pub(crate) mod consts;
 

desktop/src/window/win/native_handle.rs

@@ -72,7 +72,7 @@ impl NativeWindowHandle {
 
 		// Subclass the main window.
 		// https://learn.microsoft.com/windows/win32/api/winuser/nf-winuser-setwindowlongptra
-		let prev_window_message_handler = unsafe { SetWindowLongPtrW(main, GWLP_WNDPROC, main_window_handle_message as isize) };
+		let prev_window_message_handler = unsafe { SetWindowLongPtrW(main, GWLP_WNDPROC, main_window_handle_message as *const () as isize) };
 		if prev_window_message_handler == 0 {
 			let _ = unsafe { DestroyWindow(helper) };
 			panic!("SetWindowLongPtrW failed");

desktop/src/workspace_layout.rs

@@ -0,0 +1,15 @@
+pub(crate) fn write(workspace_layout: &str) {
+	std::fs::write(file_path(), workspace_layout).unwrap_or_else(|e| {
+		tracing::error!("Failed to write workspace layout to disk: {e}");
+	});
+}
+
+pub(crate) fn read() -> Option<String> {
+	std::fs::read_to_string(file_path()).ok()
+}
+
+fn file_path() -> std::path::PathBuf {
+	let mut path = crate::dirs::app_data_dir();
+	path.push(crate::consts::APP_WORKSPACE_LAYOUT_FILE_NAME);
+	path
+}