First go at yakui-sdl2 bindings

crates/yakui-sdl2/Cargo.toml

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+[package]
+name = "yakui-sdl2"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+yakui-core = { path = "../yakui-core", version = "0.3.0" }
+sdl2 = "0.37.0"

crates/yakui-sdl2/src/keys.rs

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+use sdl2::keyboard::{Mod, Scancode};
+use yakui_core::input::{KeyCode, Modifiers};
+
+pub fn from_sdl_scancode(key: Scancode) -> Option<KeyCode> {
+    Some(match key {
+        Scancode::Space => KeyCode::Space,
+        Scancode::Backspace => KeyCode::Backspace,
+        Scancode::Delete => KeyCode::Delete,
+        Scancode::Return => KeyCode::Enter,
+        Scancode::KpEnter => KeyCode::NumpadEnter,
+        Scancode::Tab => KeyCode::Tab,
+        Scancode::Left => KeyCode::ArrowLeft,
+        Scancode::Right => KeyCode::ArrowRight,
+        Scancode::Escape => KeyCode::Escape,
+        Scancode::Home => KeyCode::Home,
+        Scancode::End => KeyCode::End,
+        Scancode::Up => KeyCode::ArrowUp,
+        Scancode::Down => KeyCode::ArrowDown,
+        Scancode::PageUp => KeyCode::PageUp,
+        Scancode::PageDown => KeyCode::PageDown,
+
+        Scancode::A => KeyCode::KeyA,
+        Scancode::B => KeyCode::KeyB,
+        Scancode::C => KeyCode::KeyC,
+        Scancode::D => KeyCode::KeyD,
+        Scancode::E => KeyCode::KeyE,
+        Scancode::F => KeyCode::KeyF,
+        Scancode::G => KeyCode::KeyG,
+        Scancode::H => KeyCode::KeyH,
+        Scancode::I => KeyCode::KeyI,
+        Scancode::J => KeyCode::KeyJ,
+        Scancode::K => KeyCode::KeyK,
+        Scancode::L => KeyCode::KeyL,
+        Scancode::M => KeyCode::KeyM,
+        Scancode::N => KeyCode::KeyN,
+        Scancode::O => KeyCode::KeyO,
+        Scancode::P => KeyCode::KeyP,
+        Scancode::Q => KeyCode::KeyQ,
+        Scancode::R => KeyCode::KeyR,
+        Scancode::S => KeyCode::KeyS,
+        Scancode::T => KeyCode::KeyT,
+        Scancode::U => KeyCode::KeyU,
+        Scancode::V => KeyCode::KeyV,
+        Scancode::W => KeyCode::KeyW,
+        Scancode::X => KeyCode::KeyX,
+        Scancode::Y => KeyCode::KeyY,
+        Scancode::Z => KeyCode::KeyZ,
+        Scancode::Num0 => KeyCode::Digit0,
+        Scancode::Num1 => KeyCode::Digit1,
+        Scancode::Num2 => KeyCode::Digit2,
+        Scancode::Num3 => KeyCode::Digit3,
+        Scancode::Num4 => KeyCode::Digit4,
+        Scancode::Num5 => KeyCode::Digit5,
+        Scancode::Num6 => KeyCode::Digit6,
+        Scancode::Num7 => KeyCode::Digit7,
+        Scancode::Num8 => KeyCode::Digit8,
+        Scancode::Num9 => KeyCode::Digit9,
+        Scancode::F1 => KeyCode::F1,
+        Scancode::F2 => KeyCode::F2,
+        Scancode::F3 => KeyCode::F3,
+        Scancode::F4 => KeyCode::F4,
+        Scancode::F5 => KeyCode::F5,
+        Scancode::F6 => KeyCode::F6,
+        Scancode::F7 => KeyCode::F7,
+        Scancode::F8 => KeyCode::F8,
+        Scancode::F9 => KeyCode::F9,
+        Scancode::F10 => KeyCode::F10,
+        Scancode::F11 => KeyCode::F11,
+        Scancode::F12 => KeyCode::F12,
+        Scancode::F13 => KeyCode::F13,
+        Scancode::F14 => KeyCode::F14,
+        Scancode::F15 => KeyCode::F15,
+        Scancode::F16 => KeyCode::F16,
+        Scancode::F17 => KeyCode::F17,
+        Scancode::F18 => KeyCode::F18,
+        Scancode::F19 => KeyCode::F19,
+        Scancode::F20 => KeyCode::F20,
+        Scancode::F21 => KeyCode::F21,
+        Scancode::F22 => KeyCode::F22,
+        Scancode::F23 => KeyCode::F23,
+        Scancode::F24 => KeyCode::F24,
+
+        _ => return None,
+    })
+}
+
+pub fn from_sdl_modifiers(sdl_mods: Mod) -> Modifiers {
+    let mut mods = Modifiers::default();
+
+    if sdl_mods.intersects(Mod::LSHIFTMOD | Mod::RSHIFTMOD) {
+        mods |= Modifiers::SHIFT;
+    }
+
+    if sdl_mods.intersects(Mod::LCTRLMOD | Mod::RCTRLMOD) {
+        mods |= Modifiers::CONTROL;
+    }
+
+    if sdl_mods.intersects(Mod::LALTMOD) {
+        mods |= Modifiers::ALT;
+    }
+
+    if sdl_mods.intersects(Mod::LGUIMOD | Mod::RGUIMOD) {
+        mods |= Modifiers::META;
+    }
+
+    mods
+}

crates/yakui-sdl2/src/lib.rs

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+mod keys;
+
+use sdl2::event::{Event as SdlEvent, WindowEvent};
+use sdl2::mouse::MouseButton as SdlMouseButton;
+use sdl2::video::Window;
+use yakui_core::event::Event;
+use yakui_core::geometry::{Rect, UVec2, Vec2};
+use yakui_core::input::MouseButton;
+
+use self::keys::from_sdl_scancode;
+
+pub struct YakuiSdl2 {
+    init: Option<InitState>,
+}
+
+struct InitState {
+    size: UVec2,
+    scale: f32,
+}
+
+fn scale_factor(window: &Window) -> f32 {
+    let video = window.subsystem();
+    let display_index = window.display_index().unwrap();
+    video.display_dpi(display_index).unwrap().0 / 96.0
+}
+
+impl YakuiSdl2 {
+    pub fn new(window: &Window) -> Self {
+        let size = window.size().into();
+        let scale = scale_factor(window);
+
+        Self {
+            init: Some(InitState { size, scale }),
+        }
+    }
+
+    pub fn handle_event(&mut self, state: &mut yakui_core::Yakui, event: &SdlEvent) -> bool {
+        if let Some(init) = self.init.take() {
+            state.set_surface_size(init.size.as_vec2());
+            state.set_unscaled_viewport(Rect::from_pos_size(Vec2::ZERO, init.size.as_vec2()));
+            state.set_scale_factor(init.scale);
+        }
+
+        match event {
+            SdlEvent::Window { win_event, .. } => {
+                match win_event {
+                    WindowEvent::Resized(x, y) => {
+                        let size = Vec2::new(*x as f32, *y as f32);
+                        state.set_surface_size(size);
+                        state.set_unscaled_viewport(Rect::from_pos_size(Vec2::ZERO, size));
+
+                        false
+                    }
+
+                    // FIXME: scale factor changed
+                    WindowEvent::Leave => state.handle_event(Event::CursorMoved(None)),
+
+                    _ => false,
+                }
+            }
+
+            SdlEvent::MouseMotion { x, y, .. } => {
+                let pos = Vec2::new(*x as f32, *y as f32);
+                state.handle_event(Event::CursorMoved(Some(pos)))
+            }
+
+            SdlEvent::MouseButtonDown { mouse_btn, .. } => {
+                let button = match mouse_btn {
+                    SdlMouseButton::Left => MouseButton::One,
+                    SdlMouseButton::Right => MouseButton::Two,
+                    SdlMouseButton::Middle => MouseButton::Three,
+                    _ => return false,
+                };
+
+                state.handle_event(Event::MouseButtonChanged { button, down: true })
+            }
+
+            SdlEvent::MouseButtonUp { mouse_btn, .. } => {
+                let button = match mouse_btn {
+                    SdlMouseButton::Left => MouseButton::One,
+                    SdlMouseButton::Right => MouseButton::Two,
+                    SdlMouseButton::Middle => MouseButton::Three,
+                    _ => return false,
+                };
+
+                state.handle_event(Event::MouseButtonChanged {
+                    button,
+                    down: false,
+                })
+            }
+
+            SdlEvent::MouseWheel {
+                precise_x,
+                precise_y,
+                ..
+            } => state.handle_event(Event::MouseScroll {
+                delta: Vec2::new(*precise_x, *precise_y),
+            }),
+
+            SdlEvent::TextInput { text, .. } => {
+                for c in text.chars() {
+                    state.handle_event(Event::TextInput(c));
+                }
+
+                false
+            }
+
+            SdlEvent::KeyDown { scancode, .. } => {
+                if let Some(key) = scancode.and_then(from_sdl_scancode) {
+                    state.handle_event(Event::KeyChanged { key, down: true })
+                } else {
+                    false
+                }
+            }
+
+            SdlEvent::KeyUp { scancode, .. } => {
+                if let Some(key) = scancode.and_then(from_sdl_scancode) {
+                    state.handle_event(Event::KeyChanged { key, down: false })
+                } else {
+                    false
+                }
+            }
+
+            _ => false,
+        }
+    }
+}