Remove DeviceEvent::Added and Removed

This had no real use because we don't expose any information on
`DeviceId` except on Windows. But there we only expose the name. The
assumption is that this was originally added for gamepad support, which
never made it into Winit.

src/changelog/unreleased.md

@@ -104,6 +104,7 @@ changelog entry.
 - On Web, remove unused `platform::web::CustomCursorError::Animation`.
 - Remove the `rwh_04` and `rwh_05` cargo feature and the corresponding `raw-window-handle` v0.4 and
   v0.5 support. v0.6 remains in place and is enabled by default.
+- Remove `DeviceEvent::Added` and `DeviceEvent::Removed`.
 
 ### Fixed
 

src/event.rs

@@ -460,9 +460,6 @@ impl DeviceId {
 /// Note that these events are delivered regardless of input focus.
 #[derive(Clone, Debug, PartialEq)]
 pub enum DeviceEvent {
-    Added,
-    Removed,
-
     /// Change in physical position of a pointing device.
     ///
     /// This represents raw, unfiltered physical motion. Not to be confused with
@@ -1104,8 +1101,6 @@ mod tests {
                 let with_device_event =
                     |dev_ev| x(event::Event::DeviceEvent { device_id: did, event: dev_ev });
 
-                with_device_event(Added);
-                with_device_event(Removed);
                 with_device_event(MouseMotion { delta: (0.0, 0.0).into() });
                 with_device_event(MouseWheel {
                     delta: event::MouseScrollDelta::LineDelta(0.0, 0.0),

src/platform_impl/linux/x11/event_processor.rs

@@ -280,7 +280,7 @@ impl EventProcessor {
 
                     xinput2::XI_HierarchyChanged => {
                         let xev: &XIHierarchyEvent = unsafe { xev.as_event() };
-                        self.xinput2_hierarchy_changed(xev, &mut callback);
+                        self.xinput2_hierarchy_changed(xev);
                     },
                     _ => {},
                 }
@@ -1496,10 +1496,7 @@ impl EventProcessor {
         });
     }
 
-    fn xinput2_hierarchy_changed<F>(&mut self, xev: &XIHierarchyEvent, mut callback: F)
-    where
-        F: FnMut(&RootAEL, Event),
-    {
+    fn xinput2_hierarchy_changed(&mut self, xev: &XIHierarchyEvent) {
         let wt = Self::window_target(&self.target);
 
         // Set the timestamp.
@@ -1508,15 +1505,7 @@ impl EventProcessor {
         for info in infos {
             if 0 != info.flags & (xinput2::XISlaveAdded | xinput2::XIMasterAdded) {
                 self.init_device(info.deviceid as xinput::DeviceId);
-                callback(&self.target, Event::DeviceEvent {
-                    device_id: mkdid(info.deviceid as xinput::DeviceId),
-                    event: DeviceEvent::Added,
-                });
             } else if 0 != info.flags & (xinput2::XISlaveRemoved | xinput2::XIMasterRemoved) {
-                callback(&self.target, Event::DeviceEvent {
-                    device_id: mkdid(info.deviceid as xinput::DeviceId),
-                    event: DeviceEvent::Removed,
-                });
                 let mut devices = self.devices.borrow_mut();
                 devices.remove(&DeviceId(info.deviceid as xinput::DeviceId));
             }

src/platform_impl/windows/event_loop.rs

@@ -38,21 +38,20 @@ use windows_sys::Win32::UI::WindowsAndMessaging::{
     CreateWindowExW, DefWindowProcW, DestroyWindow, DispatchMessageW, GetClientRect, GetCursorPos,
     GetMenu, GetMessageW, KillTimer, LoadCursorW, PeekMessageW, PostMessageW, RegisterClassExW,
     RegisterWindowMessageA, SetCursor, SetTimer, SetWindowPos, TranslateMessage, CREATESTRUCTW,
-    GIDC_ARRIVAL, GIDC_REMOVAL, GWL_STYLE, GWL_USERDATA, HTCAPTION, HTCLIENT, MINMAXINFO,
-    MNC_CLOSE, MSG, NCCALCSIZE_PARAMS, PM_REMOVE, PT_PEN, PT_TOUCH, RI_MOUSE_HWHEEL,
-    RI_MOUSE_WHEEL, SC_MINIMIZE, SC_RESTORE, SIZE_MAXIMIZED, SWP_NOACTIVATE, SWP_NOMOVE,
-    SWP_NOSIZE, SWP_NOZORDER, WHEEL_DELTA, WINDOWPOS, WMSZ_BOTTOM, WMSZ_BOTTOMLEFT,
-    WMSZ_BOTTOMRIGHT, WMSZ_LEFT, WMSZ_RIGHT, WMSZ_TOP, WMSZ_TOPLEFT, WMSZ_TOPRIGHT,
-    WM_CAPTURECHANGED, WM_CLOSE, WM_CREATE, WM_DESTROY, WM_DPICHANGED, WM_ENTERSIZEMOVE,
-    WM_EXITSIZEMOVE, WM_GETMINMAXINFO, WM_IME_COMPOSITION, WM_IME_ENDCOMPOSITION,
-    WM_IME_SETCONTEXT, WM_IME_STARTCOMPOSITION, WM_INPUT, WM_INPUT_DEVICE_CHANGE, WM_KEYDOWN,
-    WM_KEYUP, WM_KILLFOCUS, WM_LBUTTONDOWN, WM_LBUTTONUP, WM_MBUTTONDOWN, WM_MBUTTONUP,
-    WM_MENUCHAR, WM_MOUSEHWHEEL, WM_MOUSEMOVE, WM_MOUSEWHEEL, WM_NCACTIVATE, WM_NCCALCSIZE,
-    WM_NCCREATE, WM_NCDESTROY, WM_NCLBUTTONDOWN, WM_PAINT, WM_POINTERDOWN, WM_POINTERUP,
-    WM_POINTERUPDATE, WM_RBUTTONDOWN, WM_RBUTTONUP, WM_SETCURSOR, WM_SETFOCUS, WM_SETTINGCHANGE,
-    WM_SIZE, WM_SIZING, WM_SYSCOMMAND, WM_SYSKEYDOWN, WM_SYSKEYUP, WM_TOUCH, WM_WINDOWPOSCHANGED,
-    WM_WINDOWPOSCHANGING, WM_XBUTTONDOWN, WM_XBUTTONUP, WNDCLASSEXW, WS_EX_LAYERED,
-    WS_EX_NOACTIVATE, WS_EX_TOOLWINDOW, WS_EX_TRANSPARENT, WS_OVERLAPPED, WS_POPUP, WS_VISIBLE,
+    GWL_STYLE, GWL_USERDATA, HTCAPTION, HTCLIENT, MINMAXINFO, MNC_CLOSE, MSG, NCCALCSIZE_PARAMS,
+    PM_REMOVE, PT_PEN, PT_TOUCH, RI_MOUSE_HWHEEL, RI_MOUSE_WHEEL, SC_MINIMIZE, SC_RESTORE,
+    SIZE_MAXIMIZED, SWP_NOACTIVATE, SWP_NOMOVE, SWP_NOSIZE, SWP_NOZORDER, WHEEL_DELTA, WINDOWPOS,
+    WMSZ_BOTTOM, WMSZ_BOTTOMLEFT, WMSZ_BOTTOMRIGHT, WMSZ_LEFT, WMSZ_RIGHT, WMSZ_TOP, WMSZ_TOPLEFT,
+    WMSZ_TOPRIGHT, WM_CAPTURECHANGED, WM_CLOSE, WM_CREATE, WM_DESTROY, WM_DPICHANGED,
+    WM_ENTERSIZEMOVE, WM_EXITSIZEMOVE, WM_GETMINMAXINFO, WM_IME_COMPOSITION, WM_IME_ENDCOMPOSITION,
+    WM_IME_SETCONTEXT, WM_IME_STARTCOMPOSITION, WM_INPUT, WM_KEYDOWN, WM_KEYUP, WM_KILLFOCUS,
+    WM_LBUTTONDOWN, WM_LBUTTONUP, WM_MBUTTONDOWN, WM_MBUTTONUP, WM_MENUCHAR, WM_MOUSEHWHEEL,
+    WM_MOUSEMOVE, WM_MOUSEWHEEL, WM_NCACTIVATE, WM_NCCALCSIZE, WM_NCCREATE, WM_NCDESTROY,
+    WM_NCLBUTTONDOWN, WM_PAINT, WM_POINTERDOWN, WM_POINTERUP, WM_POINTERUPDATE, WM_RBUTTONDOWN,
+    WM_RBUTTONUP, WM_SETCURSOR, WM_SETFOCUS, WM_SETTINGCHANGE, WM_SIZE, WM_SIZING, WM_SYSCOMMAND,
+    WM_SYSKEYDOWN, WM_SYSKEYUP, WM_TOUCH, WM_WINDOWPOSCHANGED, WM_WINDOWPOSCHANGING,
+    WM_XBUTTONDOWN, WM_XBUTTONUP, WNDCLASSEXW, WS_EX_LAYERED, WS_EX_NOACTIVATE, WS_EX_TOOLWINDOW,
+    WS_EX_TRANSPARENT, WS_OVERLAPPED, WS_POPUP, WS_VISIBLE,
 };
 
 use super::window::set_skip_taskbar;
@@ -61,7 +60,7 @@ use crate::application::ApplicationHandler;
 use crate::dpi::{PhysicalPosition, PhysicalSize};
 use crate::error::EventLoopError;
 use crate::event::{
-    DeviceEvent, Event, Force, Ime, InnerSizeWriter, RawKeyEvent, Touch, TouchPhase, WindowEvent,
+    Event, Force, Ime, InnerSizeWriter, RawKeyEvent, Touch, TouchPhase, WindowEvent,
 };
 use crate::event_loop::{ActiveEventLoop as RootAEL, ControlFlow, DeviceEvents};
 use crate::keyboard::ModifiersState;
@@ -2348,20 +2347,6 @@ unsafe extern "system" fn thread_event_target_callback(
             // when opening them.
             DefWindowProcW(window, msg, wparam, lparam)
         },
-
-        WM_INPUT_DEVICE_CHANGE => {
-            let event = match wparam as u32 {
-                GIDC_ARRIVAL => DeviceEvent::Added,
-                GIDC_REMOVAL => DeviceEvent::Removed,
-                _ => unreachable!(),
-            };
-
-            userdata
-                .send_event(Event::DeviceEvent { device_id: wrap_device_id(lparam as u32), event });
-
-            0
-        },
-
         WM_INPUT => {
             if let Some(data) = raw_input::get_raw_input_data(lparam as _) {
                 unsafe { handle_raw_input(&userdata, data) };