Draft web platform structure

src/platform_impl/web/event_loop/mod.rs

@@ -0,0 +1,112 @@
+mod proxy;
+mod runner;
+mod state;
+mod window_target;
+
+pub use self::proxy::Proxy;
+pub use self::window_target::WindowTarget;
+
+use super::{backend, device, monitor, window};
+use crate::event::{DeviceId, ElementState, Event, KeyboardInput, WindowEvent};
+use crate::event_loop as root;
+use crate::window::WindowId;
+
+use std::collections::{vec_deque::IntoIter as VecDequeIter, VecDeque};
+use std::marker::PhantomData;
+
+pub struct EventLoop<T: 'static> {
+    elw: root::EventLoopWindowTarget<T>,
+}
+
+impl<T> EventLoop<T> {
+    pub fn new() -> Self {
+        EventLoop {
+            elw: root::EventLoopWindowTarget {
+                p: WindowTarget::new(),
+                _marker: PhantomData,
+            },
+        }
+    }
+
+    pub fn available_monitors(&self) -> VecDequeIter<monitor::Handle> {
+        VecDeque::new().into_iter()
+    }
+
+    pub fn primary_monitor(&self) -> monitor::Handle {
+        monitor::Handle
+    }
+
+    pub fn run<F>(self, mut event_handler: F) -> !
+    where
+        F: 'static + FnMut(Event<T>, &root::EventLoopWindowTarget<T>, &mut root::ControlFlow),
+    {
+        let target = root::EventLoopWindowTarget {
+            p: self.elw.p.clone(),
+            _marker: PhantomData,
+        };
+
+        let runner = self.elw.p.run(Box::new(move |event, flow| {
+            event_handler(event, &target, flow)
+        }));
+
+        backend::Document::on_blur(|| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(window::Id),
+                event: WindowEvent::Focused(false),
+            });
+        });
+
+        backend::Document::on_focus(|| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(window::Id),
+                event: WindowEvent::Focused(true),
+            });
+        });
+
+        backend::Document::on_key_down(|scancode, virtual_keycode, modifiers| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(window::Id),
+                event: WindowEvent::KeyboardInput {
+                    device_id: DeviceId(unsafe { device::Id::dummy() }),
+                    input: KeyboardInput {
+                        scancode,
+                        state: ElementState::Pressed,
+                        virtual_keycode,
+                        modifiers,
+                    },
+                },
+            });
+        });
+
+        backend::Document::on_key_up(|scancode, virtual_keycode, modifiers| {
+            runner.send_event(Event::WindowEvent {
+                window_id: WindowId(window::Id),
+                event: WindowEvent::KeyboardInput {
+                    device_id: DeviceId(unsafe { device::Id::dummy() }),
+                    input: KeyboardInput {
+                        scancode,
+                        state: ElementState::Released,
+                        virtual_keycode,
+                        modifiers,
+                    },
+                },
+            });
+        });
+
+        // Throw an exception to break out of Rust exceution and use unreachable to tell the
+        // compiler this function won't return, giving it a return type of '!'
+        backend::throw(
+            "Using exceptions for control flow, don't mind me. This isn't actually an error!",
+        );
+
+        unreachable!();
+    }
+
+    pub fn create_proxy(&self) -> Proxy<T> {
+        self.elw.p.proxy()
+    }
+
+    pub fn window_target(&self) -> &root::EventLoopWindowTarget<T> {
+        &self.elw
+    }
+}