refactor window event handling to be more organized

src/window.rs

@@ -4,9 +4,11 @@ use std::thread::sleep;
 use log::{info, trace, debug, error};
 use skulpin::{LogicalSize, PhysicalSize};
 use skulpin::sdl2;
+use skulpin::sdl2::Sdl;
+use skulpin::sdl2::video::Window;
 use skulpin::sdl2::event::Event;
-use skulpin::sdl2::keyboard::Mod;
+use skulpin::sdl2::keyboard::{Mod, Keycode};
-use skulpin::{RendererBuilder, PresentMode, CoordinateSystem, dpis};
+use skulpin::{RendererBuilder, Renderer as SkulpinRenderer, PresentMode, CoordinateSystem, dpis};
 
 use crate::bridge::{parse_keycode, append_modifiers, BRIDGE, UiCommand};
 use crate::renderer::Renderer;
@@ -37,18 +39,36 @@ fn handle_new_grid_size(new_size: LogicalSize, renderer: &Renderer) {
     }
 }
 
-pub fn ui_loop() {
+struct WindowWrapper {
-    let sdl_context = sdl2::init().expect("Failed to initialize sdl2");
+    context: Sdl,
-    let video_subsystem = sdl_context.video().expect("Failed to create sdl video subsystem");
+    window: Window,
+    skulpin_renderer: SkulpinRenderer,
+    renderer: Renderer,
+    mouse_down: bool,
+    mouse_position: LogicalSize,
+    title: String,
+    previous_size: LogicalSize,
+    previous_dpis: (f32, f32),
+    ignore_text_input: bool
+}
+
+impl WindowWrapper {
+    pub fn new() -> WindowWrapper {
+        let context = sdl2::init().expect("Failed to initialize sdl2");
+        let video_subsystem = context.video().expect("Failed to create sdl video subsystem");
 
         let (width, height) = INITIAL_DIMENSIONS;
 
-    let mut renderer = Renderer::new();
+        let renderer = Renderer::new();
         let logical_size = LogicalSize {
             width: (width as f32 * renderer.font_width) as u32, 
             height: (height as f32 * renderer.font_height + 1.0) as u32
         };
         
+        #[cfg(target_os = "windows")]
+        windows_fix_dpi();
+        sdl2::hint::set("SDL_MOUSE_FOCUS_CLICKTHROUGH", "1");
+
         // let icon = {
         //     let icon_data = Asset::get("nvim.ico").expect("Failed to read icon data");
         //     let icon = load_from_memory(&icon_data).expect("Failed to parse icon data");
@@ -60,11 +80,8 @@ pub fn ui_loop() {
         //     Icon::from_rgba(rgba, width, height).expect("Failed to create icon object")
         // };
         // info!("icon created");
-    #[cfg(target_os = "windows")]
-    windows_fix_dpi();
-    sdl2::hint::set("SDL_MOUSE_FOCUS_CLICKTHROUGH", "1");
 
-    let mut window = video_subsystem.window("Neovide", logical_size.width, logical_size.height)
+        let window = video_subsystem.window("Neovide", logical_size.width, logical_size.height)
                 .position_centered()
                 .allow_highdpi()
                 .resizable()
@@ -73,7 +90,7 @@ pub fn ui_loop() {
                 .expect("Failed to create window");
         info!("window created");
 
-    let mut skulpin_renderer = RendererBuilder::new()
+        let skulpin_renderer = RendererBuilder::new()
             .prefer_integrated_gpu()
             .use_vulkan_debug_layer(true)
             .present_mode_priority(vec![PresentMode::Immediate])
@@ -82,55 +99,55 @@ pub fn ui_loop() {
             .expect("Failed to create renderer");
         info!("renderer created");
 
-    let mut mouse_down = false;
+        let previous_size = LogicalSize::new(&window).unwrap();
-    let mut mouse_position = LogicalSize {
+        let previous_dpis = dpis(&window).unwrap();
+
+        WindowWrapper { 
+            context, window, skulpin_renderer, renderer,
+            mouse_down: false,
+            mouse_position: LogicalSize {
                 width: 0,
                 height: 0
-    };
+            },
-
+            title: String::from("Neovide"),
-    let mut title = "Neovide".to_string();
+            previous_size,
-    let mut previous_size = LogicalSize::new(&window).unwrap();
+            previous_dpis,
-    let mut previous_dpis = dpis(&window).unwrap();
+            ignore_text_input: false
-
+        }
-    info!("Starting window event loop");
+    }
-    let mut event_pump = sdl_context.event_pump().expect("Could not create sdl event pump");
-    'running: loop {
-        let frame_start = Instant::now();
 
+    pub fn synchronize_title(&mut self) {
         let editor_title = { EDITOR.lock().title.clone() };
-        if title != editor_title {
+        if self.title != editor_title {
-            title = editor_title;
+            self.title = editor_title;
-            window.set_title(&title).expect("Could not set title");
+            self.window.set_title(&self.title).expect("Could not set title");
+        }
     }
 
-        let mut ignore_text_input = false;
+    pub fn handle_key_down(&mut self, keycode: Keycode, modifiers: Mod) {
-        for event in event_pump.poll_iter() {
-            match event {
-                Event::Quit {..} => break 'running,
-                Event::Window {..} => REDRAW_SCHEDULER.queue_next_frame(),
-                Event::KeyDown { keycode: Some(keycode), keymod: modifiers, .. } => {
         trace!("KeyDown Received: {}", keycode);
         if let Some((key_text, special)) = parse_keycode(keycode) {
             let will_text_input =
-                            
                 !modifiers.contains(Mod::LCTRLMOD) &&
                 !modifiers.contains(Mod::RCTRLMOD) &&
                 !modifiers.contains(Mod::LALTMOD) &&
                 !modifiers.contains(Mod::RALTMOD) &&
                 !modifiers.contains(Mod::LGUIMOD) &&
                 !modifiers.contains(Mod::RGUIMOD);
-                        if will_text_input && !special {
+            if modifiers.contains(Mod::MODEMOD) || (will_text_input && !special) {
-                            break;
+                self.ignore_text_input = false;
+                return;
             }
 
             BRIDGE.queue_command(UiCommand::Keyboard(append_modifiers(modifiers, key_text, special)));
-                        ignore_text_input = true;
+            self.ignore_text_input = true;
         }
-                },
+    }
-                Event::TextInput { text, .. } => {
+
+    pub fn handle_text_input(&mut self, text: String) {
         trace!("Keyboard Input Received: {}", &text);
-                    if ignore_text_input {
+        if self.ignore_text_input {
-                        ignore_text_input = false;
+            self.ignore_text_input = false;
         } else {
             let text = if text == "<" {
                 String::from("<lt>")
@@ -139,28 +156,38 @@ pub fn ui_loop() {
             };
             BRIDGE.queue_command(UiCommand::Keyboard(text))
         }
-                },
+    }
-                Event::MouseMotion { x, y, .. } => {
+
-                    let previous_position = mouse_position;
+    pub fn handle_pointer_motion(&mut self, x: i32, y: i32) {
-                    mouse_position = LogicalSize::from_physical_size_tuple((
+        let previous_position = self.mouse_position;
-                            (x as f32 / renderer.font_width) as u32,
+        self.mouse_position = LogicalSize::from_physical_size_tuple((
-                            (y as f32 / renderer.font_height) as u32
+                (x as f32 / self.renderer.font_width) as u32,
+                (y as f32 / self.renderer.font_height) as u32
             ), 
-                        &window
+            &self.window
         ).expect("Could not calculate logical mouse position");
-                    if mouse_down && previous_position != mouse_position {
+        if self.mouse_down && previous_position != self.mouse_position {
-                        BRIDGE.queue_command(UiCommand::Drag(mouse_position.width, mouse_position.height));
+            BRIDGE.queue_command(UiCommand::Drag(self.mouse_position.width, self.mouse_position.height));
         }
-                },
+    }
-                Event::MouseButtonDown { .. } => {
+
-                    BRIDGE.queue_command(UiCommand::MouseButton { action: String::from("press"), position: (mouse_position.width, mouse_position.height) });
+    pub fn handle_pointer_down(&mut self) {
-                    mouse_down = true;
+        BRIDGE.queue_command(UiCommand::MouseButton { 
-                },
+            action: String::from("press"), 
-                Event::MouseButtonUp { .. } => {
+            position: (self.mouse_position.width, self.mouse_position.height) 
-                    BRIDGE.queue_command(UiCommand::MouseButton { action: String::from("release"), position: (mouse_position.width, mouse_position.height) });
+        });
-                    mouse_down = false;
+        self.mouse_down = true;
-                },
+    }
-                Event::MouseWheel { x, y, .. } => {
+
+    pub fn handle_pointer_up(&mut self)  {
+        BRIDGE.queue_command(UiCommand::MouseButton { 
+            action: String::from("release"), 
+            position: (self.mouse_position.width, self.mouse_position.height) 
+        });
+        self.mouse_down = false;
+    }
+
+    pub fn handle_mouse_wheel(&mut self, x: i32, y: i32) {
         let vertical_input_type = if y > 0 {
             Some("up")
         } else if y < 0 {
@@ -170,7 +197,10 @@ pub fn ui_loop() {
         };
 
         if let Some(input_type) = vertical_input_type {
-                        BRIDGE.queue_command(UiCommand::Scroll { direction: input_type.to_string(), position: (mouse_position.width, mouse_position.height) });
+            BRIDGE.queue_command(UiCommand::Scroll { 
+                direction: input_type.to_string(), 
+                position: (self.mouse_position.width, self.mouse_position.height) 
+            });
         }
 
         let horizontal_input_type = if x > 0 {
@@ -182,39 +212,72 @@ pub fn ui_loop() {
         };
 
         if let Some(input_type) = horizontal_input_type {
-                        BRIDGE.queue_command(UiCommand::Scroll { direction: input_type.to_string(), position: (mouse_position.width, mouse_position.height) });
+            BRIDGE.queue_command(UiCommand::Scroll { 
-                    }
+                direction: input_type.to_string(), 
-                },
+                position: (self.mouse_position.width, self.mouse_position.height) 
-                _ => {}
+            });
         }
     }
 
-        let new_size = LogicalSize::new(&window).unwrap();
+    pub fn draw_frame(&mut self) -> bool {
-        if previous_size != new_size {
+        let new_size = LogicalSize::new(&self.window).unwrap();
-            handle_new_grid_size(new_size, &renderer);
+        if self.previous_size != new_size {
-            previous_size = new_size;
+            handle_new_grid_size(new_size, &self.renderer);
+            self.previous_size = new_size;
         }
 
-        let new_dpis = dpis(&window).unwrap();
+        let new_dpis = dpis(&self.window).unwrap();
-        if previous_dpis != new_dpis {
+        if self.previous_dpis != new_dpis {
-            let physical_size = PhysicalSize::new(&window);
+            let physical_size = PhysicalSize::new(&self.window);
-            window.set_size(
+            self.window.set_size(
-                (physical_size.width as f32 * new_dpis.0 / previous_dpis.0) as u32,
+                (physical_size.width as f32 * new_dpis.0 / self.previous_dpis.0) as u32,
-                (physical_size.height as f32 * new_dpis.1 / previous_dpis.1) as u32).unwrap();
+                (physical_size.height as f32 * new_dpis.1 / self.previous_dpis.1) as u32).unwrap();
-            previous_dpis = new_dpis;
+            self.previous_dpis = new_dpis;
         }
 
         debug!("Render Triggered");
         if REDRAW_SCHEDULER.should_draw() || SETTINGS.get("no_idle").read_bool() {
-            if skulpin_renderer.draw(&window, |canvas, coordinate_system_helper| {
+            let renderer = &mut self.renderer;
+            if self.skulpin_renderer.draw(&self.window, |canvas, coordinate_system_helper| {
                 if renderer.draw(canvas, coordinate_system_helper) {
                     handle_new_grid_size(new_size, &renderer)
                 }
             }).is_err() {
                 error!("Render failed. Closing");
-                break;
+                return false;
             }
         }
+        return true;
+    }
+}
+
+pub fn ui_loop() {
+    let mut window = WindowWrapper::new();
+
+    info!("Starting window event loop");
+    let mut event_pump = window.context.event_pump().expect("Could not create sdl event pump");
+    'running: loop {
+        let frame_start = Instant::now();
+
+        window.synchronize_title();
+
+        for event in event_pump.poll_iter() {
+            match event {
+                Event::Quit {..} => break 'running,
+                Event::Window {..} => REDRAW_SCHEDULER.queue_next_frame(),
+                Event::KeyDown { keycode: Some(keycode), keymod: modifiers, .. } => window.handle_key_down(keycode, modifiers),
+                Event::TextInput { text, .. } => window.handle_text_input(text),
+                Event::MouseMotion { x, y, .. } => window.handle_pointer_motion(x, y),
+                Event::MouseButtonDown { .. } => window.handle_pointer_down(),
+                Event::MouseButtonUp { .. } => window.handle_pointer_up(),
+                Event::MouseWheel { x, y, .. } => window.handle_mouse_wheel(x, y),
+                _ => {}
+            }
+        }
+
+        if !window.draw_frame() {
+            break;
+        }
 
         let elapsed = frame_start.elapsed();
         let refresh_rate = SETTINGS.get("refresh_rate").read_u16() as f32;