Move ModifiersChanged variant to WindowEvent

CHANGELOG.md

@@ -3,6 +3,7 @@
 - On Windows, fix bug where `RedrawRequested` would only get emitted every other iteration of the event loop.
 - On X11, fix deadlock on window state when handling certain window events.
 - `WindowBuilder` now implements `Default`.
+- **Breaking:** Move `ModifiersChanged` variant from `DeviceEvent` to `WindowEvent`.
 
 # 0.20.0 (2020-01-05)
 

examples/cursor_grab.rs

@@ -38,6 +38,7 @@ fn main() {
                         _ => (),
                     }
                 }
+                WindowEvent::ModifiersChanged(m) => modifiers = m,
                 _ => (),
             },
             Event::DeviceEvent { event, .. } => match event {
@@ -46,7 +47,6 @@ fn main() {
                     ElementState::Pressed => println!("mouse button {} pressed", button),
                     ElementState::Released => println!("mouse button {} released", button),
                 },
-                DeviceEvent::ModifiersChanged(m) => modifiers = m,
                 _ => (),
             },
             _ => (),

src/event.rs

@@ -235,6 +235,13 @@ pub enum WindowEvent<'a> {
         is_synthetic: bool,
     },
 
+    /// The keyboard modifiers have changed.
+    ///
+    /// Platform-specific behavior:
+    /// - **Web**: This API is currently unimplemented on the web. This isn't by design - it's an
+    ///   issue, and it should get fixed - but it's the current state of the API.
+    ModifiersChanged(ModifiersState),
+
     /// The cursor has moved on the window.
     CursorMoved {
         device_id: DeviceId,
@@ -243,7 +250,7 @@ pub enum WindowEvent<'a> {
         /// limited by the display area and it may have been transformed by the OS to implement effects such as cursor
         /// acceleration, it should not be used to implement non-cursor-like interactions such as 3D camera control.
         position: PhysicalPosition<i32>,
-        #[deprecated = "Deprecated in favor of DeviceEvent::ModifiersChanged"]
+        #[deprecated = "Deprecated in favor of WindowEvent::ModifiersChanged"]
         modifiers: ModifiersState,
     },
 
@@ -258,7 +265,7 @@ pub enum WindowEvent<'a> {
         device_id: DeviceId,
         delta: MouseScrollDelta,
         phase: TouchPhase,
-        #[deprecated = "Deprecated in favor of DeviceEvent::ModifiersChanged"]
+        #[deprecated = "Deprecated in favor of WindowEvent::ModifiersChanged"]
         modifiers: ModifiersState,
     },
 
@@ -267,7 +274,7 @@ pub enum WindowEvent<'a> {
         device_id: DeviceId,
         state: ElementState,
         button: MouseButton,
-        #[deprecated = "Deprecated in favor of DeviceEvent::ModifiersChanged"]
+        #[deprecated = "Deprecated in favor of WindowEvent::ModifiersChanged"]
         modifiers: ModifiersState,
     },
 
@@ -341,6 +348,7 @@ impl<'a> WindowEvent<'a> {
                 input,
                 is_synthetic,
             }),
+            ModifiersChanged(modifiers) => Some(ModifiersChanged(modifiers)),
             #[allow(deprecated)]
             CursorMoved {
                 device_id,
@@ -464,16 +472,6 @@ pub enum DeviceEvent {
 
     Key(KeyboardInput),
 
-    /// The keyboard modifiers have changed.
-    ///
-    /// 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.
-    ///
-    /// Platform-specific behavior:
-    /// - **Web**: This API is currently unimplemented on the web. This isn't by design - it's an
-    ///   issue, and it should get fixed - but it's the current state of the API.
-    ModifiersChanged(ModifiersState),
-
     Text {
         codepoint: char,
     },
@@ -502,7 +500,7 @@ pub struct KeyboardInput {
     ///
     /// 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.
-    #[deprecated = "Deprecated in favor of DeviceEvent::ModifiersChanged"]
+    #[deprecated = "Deprecated in favor of WindowEvent::ModifiersChanged"]
     pub modifiers: ModifiersState,
 }
 

src/platform_impl/linux/wayland/keyboard.rs

@@ -8,9 +8,7 @@ use smithay_client_toolkit::{
     reexports::client::protocol::{wl_keyboard, wl_seat},
 };
 
-use crate::event::{
+use crate::event::{ElementState, KeyboardInput, ModifiersState, VirtualKeyCode, WindowEvent};
-    DeviceEvent, ElementState, KeyboardInput, ModifiersState, VirtualKeyCode, WindowEvent,
-};
 
 pub fn init_keyboard(
     seat: &wl_seat::WlSeat,
@@ -33,9 +31,24 @@ pub fn init_keyboard(
                     let wid = make_wid(&surface);
                     my_sink.send_window_event(WindowEvent::Focused(true), wid);
                     *target.lock().unwrap() = Some(wid);
+
+                    let modifiers = *modifiers_tracker.lock().unwrap();
+
+                    if !modifiers.is_empty() {
+                        my_sink.send_window_event(WindowEvent::ModifiersChanged(modifiers), wid);
+                    }
                 }
                 KbEvent::Leave { surface, .. } => {
                     let wid = make_wid(&surface);
+                    let modifiers = *modifiers_tracker.lock().unwrap();
+
+                    if !modifiers.is_empty() {
+                        my_sink.send_window_event(
+                            WindowEvent::ModifiersChanged(ModifiersState::empty()),
+                            wid,
+                        );
+                    }
+
                     my_sink.send_window_event(WindowEvent::Focused(false), wid);
                     *target.lock().unwrap() = None;
                 }
@@ -88,7 +101,9 @@ pub fn init_keyboard(
 
                     *modifiers_tracker.lock().unwrap() = modifiers;
 
-                    my_sink.send_device_event(DeviceEvent::ModifiersChanged(modifiers), DeviceId);
+                    if let Some(wid) = *target.lock().unwrap() {
+                        my_sink.send_window_event(WindowEvent::ModifiersChanged(modifiers), wid);
+                    }
                 }
             }
         },

src/platform_impl/linux/x11/event_processor.rs

@@ -32,6 +32,8 @@ pub(super) struct EventProcessor<T: 'static> {
     // Number of touch events currently in progress
     pub(super) num_touch: u32,
     pub(super) first_touch: Option<u64>,
+    // Currently focused window belonging to this process
+    pub(super) active_window: Option<ffi::Window>,
 }
 
 impl<T: 'static> EventProcessor<T> {
@@ -136,14 +138,15 @@ impl<T: 'static> EventProcessor<T> {
                         if let Some(modifiers) =
                             self.device_mod_state.update_state(&state, modifier)
                         {
-                            let device_id = mkdid(util::VIRTUAL_CORE_KEYBOARD);
+                            if let Some(window_id) = self.active_window {
-                            callback(Event::DeviceEvent {
+                                callback(Event::WindowEvent {
-                                device_id,
+                                    window_id: mkwid(window_id),
-                                event: DeviceEvent::ModifiersChanged(modifiers),
+                                    event: WindowEvent::ModifiersChanged(modifiers),
                                 });
                             }
                         }
                     }
+                }
             }};
         }
 
@@ -874,21 +877,31 @@ impl<T: 'static> EventProcessor<T> {
                     ffi::XI_FocusIn => {
                         let xev: &ffi::XIFocusInEvent = unsafe { &*(xev.data as *const _) };
 
-                        let window_id = mkwid(xev.event);
-
                         wt.ime
                             .borrow_mut()
                             .focus(xev.event)
                             .expect("Failed to focus input context");
 
+                        let modifiers = ModifiersState::from_x11(&xev.mods);
+
+                        self.device_mod_state.update_state(&modifiers, None);
+
+                        if self.active_window != Some(xev.event) {
+                            self.active_window = Some(xev.event);
+
+                            let window_id = mkwid(xev.event);
+
                             callback(Event::WindowEvent {
                                 window_id,
                                 event: Focused(true),
                             });
 
-                        let modifiers = ModifiersState::from_x11(&xev.mods);
+                            if !modifiers.is_empty() {
-
+                                callback(Event::WindowEvent {
-                        update_modifiers!(modifiers, None);
+                                    window_id,
+                                    event: WindowEvent::ModifiersChanged(modifiers),
+                                });
+                            }
 
                             // The deviceid for this event is for a keyboard instead of a pointer,
                             // so we have to do a little extra work.
@@ -912,7 +925,12 @@ impl<T: 'static> EventProcessor<T> {
                             });
 
                             // Issue key press events for all pressed keys
-                        self.handle_pressed_keys(window_id, ElementState::Pressed, &mut callback);
+                            self.handle_pressed_keys(
+                                window_id,
+                                ElementState::Pressed,
+                                &mut callback,
+                            );
+                        }
                     }
                     ffi::XI_FocusOut => {
                         let xev: &ffi::XIFocusOutEvent = unsafe { &*(xev.data as *const _) };
@@ -924,16 +942,27 @@ impl<T: 'static> EventProcessor<T> {
                             .unfocus(xev.event)
                             .expect("Failed to unfocus input context");
 
+                        if self.active_window.take() == Some(xev.event) {
                             let window_id = mkwid(xev.event);
 
                             // Issue key release events for all pressed keys
-                        self.handle_pressed_keys(window_id, ElementState::Released, &mut callback);
+                            self.handle_pressed_keys(
+                                window_id,
+                                ElementState::Released,
+                                &mut callback,
+                            );
+
+                            callback(Event::WindowEvent {
+                                window_id,
+                                event: WindowEvent::ModifiersChanged(ModifiersState::empty()),
+                            });
 
                             callback(Event::WindowEvent {
                                 window_id,
                                 event: Focused(false),
                             })
                         }
+                    }
 
                     ffi::XI_TouchBegin | ffi::XI_TouchUpdate | ffi::XI_TouchEnd => {
                         let xev: &ffi::XIDeviceEvent = unsafe { &*(xev.data as *const _) };
@@ -1087,13 +1116,15 @@ impl<T: 'static> EventProcessor<T> {
                             let new_modifiers = self.device_mod_state.modifiers();
 
                             if modifiers != new_modifiers {
-                                callback(Event::DeviceEvent {
+                                if let Some(window_id) = self.active_window {
-                                    device_id,
+                                    callback(Event::WindowEvent {
-                                    event: DeviceEvent::ModifiersChanged(new_modifiers),
+                                        window_id: mkwid(window_id),
+                                        event: WindowEvent::ModifiersChanged(new_modifiers),
                                     });
                                 }
                             }
                         }
+                    }
 
                     ffi::XI_HierarchyChanged => {
                         let xev: &ffi::XIHierarchyEvent = unsafe { &*(xev.data as *const _) };

src/platform_impl/linux/x11/mod.rs

@@ -206,6 +206,7 @@ impl<T: 'static> EventLoop<T> {
             device_mod_state: Default::default(),
             num_touch: 0,
             first_touch: None,
+            active_window: None,
         };
 
         // Register for device hotplug events