Fix web errors (#1040)

* Fix old `use` declarations

* Fix hidden lifetime parameter

* Fix missing methods in `web::Monitor`.

Originally fixed by @ryanisaacg in 94387c4bf5bca35f4e24562ce89a4f4badd53aa8.

* Disable some tests and examples on `wasm32`

examples/multithreaded.rs

@@ -1,16 +1,18 @@
-extern crate env_logger;
-use std::{collections::HashMap, sync::mpsc, thread, time::Duration};
-
-use winit::{
-    event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
-    event_loop::{ControlFlow, EventLoop},
-    window::{CursorIcon, WindowBuilder},
-};
-
-const WINDOW_COUNT: usize = 3;
-const WINDOW_SIZE: (u32, u32) = (600, 400);
-
+#[cfg(not(target_arch = "wasm32"))]
 fn main() {
+    extern crate env_logger;
+
+    use std::{collections::HashMap, sync::mpsc, thread, time::Duration};
+
+    use winit::{
+        event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
+        event_loop::{ControlFlow, EventLoop},
+        window::{CursorIcon, WindowBuilder},
+    };
+
+    const WINDOW_COUNT: usize = 3;
+    const WINDOW_SIZE: (u32, u32) = (600, 400);
+
     env_logger::init();
     let event_loop = EventLoop::new();
     let mut window_senders = HashMap::with_capacity(WINDOW_COUNT);
@@ -36,7 +38,7 @@ fn main() {
                     } => {
                         window.set_title(&format!("{:?}", key));
                         let state = !modifiers.shift;
-                        use self::VirtualKeyCode::*;
+                        use VirtualKeyCode::*;
                         match key {
                             A => window.set_always_on_top(state),
                             C => window.set_cursor_icon(match state {
@@ -125,3 +127,8 @@ fn main() {
         }
     })
 }
+
+#[cfg(target_arch = "wasm32")]
+fn main() {
+    panic!("Example not supported on Wasm");
+}

examples/proxy.rs

@@ -1,10 +1,11 @@
-use winit::{
-    event::{Event, WindowEvent},
-    event_loop::{ControlFlow, EventLoop},
-    window::WindowBuilder,
-};
-
+#[cfg(not(target_arch = "wasm32"))]
 fn main() {
+    use winit::{
+        event::{Event, WindowEvent},
+        event_loop::{ControlFlow, EventLoop},
+        window::WindowBuilder,
+    };
+
     let event_loop: EventLoop<i32> = EventLoop::new_user_event();
 
     let _window = WindowBuilder::new()
@@ -35,3 +36,8 @@ fn main() {
         }
     });
 }
+
+#[cfg(target_arch = "wasm32")]
+fn main() {
+    panic!("Example not supported on Wasm");
+}

examples/request_redraw.rs

@@ -1,4 +1,5 @@
-use std::time::{Duration, Instant};
+use instant::Instant;
+use std::time::Duration;
 
 use winit::{
     event::{Event, WindowEvent},

examples/timer.rs

@@ -1,4 +1,5 @@
-use std::time::{Duration, Instant};
+use instant::Instant;
+use std::time::Duration;
 use winit::{
     event::{Event, StartCause, WindowEvent},
     event_loop::{ControlFlow, EventLoop},

examples/window_run_return.rs

@@ -1,11 +1,11 @@
-use winit::{
-    event::{Event, WindowEvent},
-    event_loop::{ControlFlow, EventLoop},
-    platform::desktop::EventLoopExtDesktop,
-    window::WindowBuilder,
-};
-
+#[cfg(not(target_arch = "wasm32"))]
 fn main() {
+    use winit::{
+        event::{Event, WindowEvent},
+        event_loop::{ControlFlow, EventLoop},
+        platform::desktop::EventLoopExtDesktop,
+        window::WindowBuilder,
+    };
     let mut event_loop = EventLoop::new();
 
     let window = WindowBuilder::new()
@@ -39,3 +39,8 @@ fn main() {
 
     println!("Okay we're done now for real.");
 }
+
+#[cfg(target_arch = "wasm32")]
+fn main() {
+    panic!("Example not supported on Wasm");
+}

src/event_loop.rs

@@ -13,9 +13,9 @@ use instant::Instant;
 use std::ops::Deref;
 use std::{error, fmt};
 
-use event::Event;
-use monitor::{AvailableMonitorsIter, MonitorHandle};
-use platform_impl;
+use crate::event::Event;
+use crate::monitor::{AvailableMonitorsIter, MonitorHandle};
+use crate::platform_impl;
 
 /// Provides a way to retrieve events from the system and from the windows that were registered to
 /// the events loop.

src/platform_impl/web/error.rs

@@ -4,7 +4,7 @@ use std::fmt;
 pub struct OsError(pub String);
 
 impl fmt::Display for OsError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{}", self.0)
     }
 }

src/platform_impl/web/monitor.rs

@@ -1,4 +1,5 @@
 use crate::dpi::{PhysicalPosition, PhysicalSize};
+use crate::monitor::VideoMode;
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Handle;
@@ -12,11 +13,16 @@ impl Handle {
         unimplemented!();
     }
 
-    pub fn dimensions(&self) -> PhysicalSize {
-        unimplemented!();
-    }
-
     pub fn name(&self) -> Option<String> {
         unimplemented!();
     }
+
+    pub fn size(&self) -> PhysicalSize {
+        unimplemented!();
+    }
+
+    pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
+        // TODO: is this possible ?
+        std::iter::empty()
+    }
 }

tests/send_objects.rs

@@ -1,6 +1,7 @@
 #[allow(dead_code)]
 fn needs_send<T: Send>() {}
 
+#[cfg(not(target_arch = "wasm32"))]
 #[test]
 fn event_loop_proxy_send() {
     #[allow(dead_code)]
@@ -10,6 +11,7 @@ fn event_loop_proxy_send() {
     }
 }
 
+#[cfg(not(target_arch = "wasm32"))]
 #[test]
 fn window_send() {
     // ensures that `winit::Window` implements `Send`

tests/sync_object.rs

@@ -1,6 +1,7 @@
 #[allow(dead_code)]
 fn needs_sync<T: Sync>() {}
 
+#[cfg(not(target_arch = "wasm32"))]
 #[test]
 fn window_sync() {
     // ensures that `winit::Window` implements `Sync`