Richer input events

examples/cursor.rs

@@ -1,6 +1,6 @@
 extern crate winit;
 
-use winit::{Event, ElementState, MouseCursor, WindowEvent};
+use winit::{Event, ElementState, MouseCursor, WindowEvent, KeyboardInput};
 
 fn main() {
     let events_loop = winit::EventsLoop::new();
@@ -13,7 +13,7 @@ fn main() {
 
     events_loop.run_forever(|event| {
         match event {
-            Event::WindowEvent { event: WindowEvent::KeyboardInput(ElementState::Pressed, _, _, _), .. } => {
+            Event::WindowEvent { event: WindowEvent::KeyboardInput { input: KeyboardInput { state: ElementState::Pressed, .. }, .. }, .. } => {
                 println!("Setting cursor to \"{:?}\"", cursors[cursor_idx]);
                 window.set_cursor(cursors[cursor_idx]);
                 if cursor_idx < cursors.len() - 1 {

examples/fullscreen.rs

@@ -37,10 +37,13 @@ fn main() {
             winit::Event::WindowEvent { event, .. } => {
                 match event {
                     winit::WindowEvent::Closed => events_loop.interrupt(),
-                    winit::WindowEvent::KeyboardInput(_, _, Some(winit::VirtualKeyCode::Escape), _) => events_loop.interrupt(),
+                    winit::WindowEvent::KeyboardInput {
+                        input: winit::KeyboardInput { virtual_keycode: Some(winit::VirtualKeyCode::Escape), .. }, ..
+                    } => events_loop.interrupt(),
                     _ => ()
                 }
             },
+            _ => {}
         }
     });
 }

examples/grabbing.rs

@@ -1,6 +1,6 @@
 extern crate winit;
 
-use winit::{WindowEvent, ElementState};
+use winit::{WindowEvent, ElementState, KeyboardInput};
 
 fn main() {
     let events_loop = winit::EventsLoop::new();
@@ -16,7 +16,7 @@ fn main() {
         match event {
             winit::Event::WindowEvent { event, .. } => {
                 match event {
-                    WindowEvent::KeyboardInput(ElementState::Pressed, _, _, _) => {
+                    WindowEvent::KeyboardInput { input: KeyboardInput { state: ElementState::Pressed, .. }, .. } => {
                         if grabbed {
                             grabbed = false;
                             window.set_cursor_state(winit::CursorState::Normal)
@@ -30,13 +30,14 @@ fn main() {
 
                     WindowEvent::Closed => events_loop.interrupt(),
 
-                    a @ WindowEvent::MouseMoved(_, _) => {
+                    a @ WindowEvent::MouseMoved { .. } => {
                         println!("{:?}", a);
                     },
 
                     _ => (),
                 }
-            },
+            }
+            _ => {}
         }
     });
 }

src/api_transition.rs

@@ -57,6 +57,9 @@ macro_rules! gen_api_transition {
         #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
         pub struct WindowId(usize);
 
+        #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+        pub struct DeviceId;
+
         pub struct Window2 {
             pub window: ::std::sync::Arc<Window>,
             events_loop: ::std::sync::Weak<EventsLoop>,

src/events.rs

@@ -1,12 +1,16 @@
 use std::path::PathBuf;
-use WindowId;
+use {WindowId, DeviceId, AxisId, ButtonId};
 
 #[derive(Clone, Debug)]
 pub enum Event {
     WindowEvent {
         window_id: WindowId,
         event: WindowEvent,
-    }
+    },
+    DeviceEvent {
+        device_id: DeviceId,
+        event: DeviceEvent,
+    },
 }
 
 #[derive(Clone, Debug)]
@@ -35,31 +39,36 @@ pub enum WindowEvent {
     Focused(bool),
 
     /// An event from the keyboard has been received.
-    KeyboardInput(ElementState, ScanCode, Option<VirtualKeyCode>, ModifiersState),
+    KeyboardInput { device_id: DeviceId, input: KeyboardInput },
 
     /// The cursor has moved on the window.
     ///
-    /// The parameter are the (x,y) coords in pixels relative to the top-left corner of the window.
-    MouseMoved(i32, i32),
+    /// `position` is (x,y) coords in pixels relative to the top-left corner of the window. Because the range of this
+    /// data is limited by the display area and it may have been transformed by the OS to implement effects such as
+    /// mouse acceleration, it should not be used to implement non-cursor-like interactions such as 3D camera control.
+    MouseMoved { device_id: DeviceId, position: (f64, f64) },
 
     /// The cursor has entered the window.
-    MouseEntered,
+    MouseEntered { device_id: DeviceId },
 
     /// The cursor has left the window.
-    MouseLeft,
+    MouseLeft { device_id: DeviceId },
 
     /// A mouse wheel movement or touchpad scroll occurred.
-    MouseWheel(MouseScrollDelta, TouchPhase),
+    MouseWheel { device_id: DeviceId, delta: MouseScrollDelta, phase: TouchPhase },
 
-    /// An event from the mouse has been received.
-    MouseInput(ElementState, MouseButton),
+    /// An mouse button press has been received.
+    MouseInput { device_id: DeviceId, state: ElementState, button: MouseButton },
 
     /// Touchpad pressure event.
     ///
     /// At the moment, only supported on Apple forcetouch-capable macbooks.
     /// The parameters are: pressure level (value between 0 and 1 representing how hard the touchpad
     /// is being pressed) and stage (integer representing the click level).
-    TouchpadPressure(f32, i64),
+    TouchpadPressure { device_id: DeviceId, pressure: f32, stage: i64 },
+
+    /// Motion on some analog axis not otherwise handled. May overlap with mouse motion.
+    AxisMotion { device_id: DeviceId, axis: AxisId, value: f64 },
 
     /// The window needs to be redrawn.
     Refresh,
@@ -73,6 +82,48 @@ pub enum WindowEvent {
     Touch(Touch)
 }
 
+/// Represents raw hardware events that are not associated with any particular window.
+///
+/// Useful for interactions that diverge significantly from a conventional 2D GUI, such as 3D camera or first-person
+/// game controls. Many physical actions, such as mouse movement, can produce both device and window events. Because
+/// window events typically arise from virtual devices (corresponding to GUI cursors and keyboard focus) the device IDs
+/// may not match.
+///
+/// Note that these events are delivered regardless of input focus.
+#[derive(Clone, Debug)]
+pub enum DeviceEvent {
+    Added,
+    Removed,
+    Motion { axis: AxisId, value: f64 },
+    Button { button: ButtonId, state: ElementState },
+    Key(KeyboardInput),
+    Text { codepoint: char },
+}
+
+#[derive(Debug, Clone, Copy)]
+pub struct KeyboardInput {
+    /// Identifies the physical key pressed
+    ///
+    /// This should not change if the user adjusts the host's keyboard map. Use when the physical location of the
+    /// key is more important than the key's host GUI semantics, such as for movement controls in a first-person
+    /// game.
+    pub scancode: ScanCode,
+
+    pub state: ElementState,
+
+    /// Identifies the semantic meaning of the key
+    ///
+    /// Use when the semantics of the key are more important than the physical location of the key, such as when
+    /// implementing appropriate behavior for "page up."
+    pub virtual_keycode: Option<VirtualKeyCode>,
+
+    /// Modifier keys active at the time of this input.
+    ///
+    /// This is tracked internally to avoid tracking errors arising from modifier key state changes when events from
+    /// this device are not being delivered to the application, e.g. due to keyboard focus being elsewhere.
+    pub modifiers: ModifiersState
+}
+
 #[derive(Debug, Hash, PartialEq, Eq, Clone, Copy)]
 pub enum TouchPhase {
     Started,
@@ -98,13 +149,14 @@ pub enum TouchPhase {
 ///
 /// Touch may be cancelled if for example window lost focus.
 pub struct Touch {
+    pub device_id: DeviceId,
     pub phase: TouchPhase,
     pub location: (f64,f64),
     /// unique identifier of a finger.
     pub id: u64
 }
 
-pub type ScanCode = u8;
+pub type ScanCode = u32;
 
 #[derive(Debug, Hash, PartialEq, Eq, Clone, Copy)]
 pub enum ElementState {

src/lib.rs

@@ -169,6 +169,22 @@ pub struct Window {
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct WindowId(platform::WindowId);
 
+/// Identifier of an input device.
+///
+/// Whenever you receive an event arising from a particular input device, this event contains a `DeviceId` which
+/// identifies its origin. Note that devices may be virtual (representing an on-screen cursor and keyboard focus) or
+/// physical. Virtual devices typically aggregate inputs from multiple physical devices.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct DeviceId(platform::DeviceId);
+
+/// Identifier for a specific analog axis on some device.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct AxisId(u32);
+
+/// Identifier for a specific button on some device.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct ButtonId(u32);
+
 /// Provides a way to retreive events from the windows that were registered to it.
 // TODO: document usage in multiple threads
 pub struct EventsLoop {

src/platform/ios/mod.rs

@@ -287,6 +287,7 @@ impl Window {
                     let phase: i32 = msg_send![touch, phase];
 
                     state.events_queue.push_back(Event::Touch(Touch {
+                        device_id: DEVICE_ID,
                         id: touch_id,
                         location: (location.x as f64, location.y as f64),
                         phase: match phase {
@@ -495,3 +496,6 @@ impl<'a> Iterator for PollEventsIterator<'a> {
         }
     }
 }
+
+// Constant device ID, to be removed when this backend is updated to report real device IDs.
+const DEVICE_ID: ::DeviceId = ::DeviceId(DeviceId);

src/platform/linux/mod.rs

@@ -58,6 +58,14 @@ pub enum WindowId {
     Wayland(wayland::WindowId)
 }
 
+#[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum DeviceId {
+    #[doc(hidden)]
+    X(x11::DeviceId),
+    #[doc(hidden)]
+    Wayland(wayland::DeviceId)
+}
+
 #[derive(Clone)]
 pub enum MonitorId {
     #[doc(hidden)]
@@ -137,8 +145,8 @@ impl Window2 {
                 }
             },
 
-            UnixBackend::X(ref connec) => {
-                x11::Window2::new(events_loop, connec, window, pl_attribs).map(Window2::X)
+            UnixBackend::X(_) => {
+                x11::Window2::new(events_loop, window, pl_attribs).map(Window2::X)
             },
             UnixBackend::Error(_) => {
                 // If the Backend is Error(), it is not possible to instanciate an EventsLoop at all,
@@ -308,8 +316,8 @@ impl EventsLoop {
                 EventsLoop::Wayland(wayland::EventsLoop::new(ctxt.clone()))
             },
 
-            UnixBackend::X(_) => {
-                EventsLoop::X(x11::EventsLoop::new())
+            UnixBackend::X(ref ctxt) => {
+                EventsLoop::X(x11::EventsLoop::new(ctxt.clone()))
             },
 
             UnixBackend::Error(_) => {