port gain example GUI to new API

Author: micahrj

examples/gain/Cargo.toml

@@ -10,6 +10,6 @@ formats = ["clap", "vst3"]
 
 [dependencies]
 coupler = { workspace = true, features = ["derive"] }
-coupler-reflector = { path = "../../coupler-reflector" }
+reflector = { git = "https://github.com/coupler-rs/reflector", rev = "eb40c59a71470077b4f58a26685796d1609ea8ed" }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"

examples/gain/src/lib.rs

@@ -1,12 +1,20 @@
+use std::cell::RefCell;
 use std::io::{self, Read, Write};
+use std::rc::Rc;
 
 use serde::{Deserialize, Serialize};
 
 use coupler::format::clap::*;
 use coupler::format::vst3::*;
+use coupler::params::{ParamId, ParamValue};
+use coupler::view::{ParentWindow, RawParent, Size, View};
 use coupler::{buffers::*, bus::*, engine::*, events::*, host::*, params::*, plugin::*, view::*};
 
-use coupler_reflector::PluginWindow;
+use reflector::graphics::Renderer;
+use reflector::platform::{
+    App, AppMode, AppOptions, Bitmap, Cursor, MouseButton, Point, RawWindow, Response, Result,
+    Window, WindowContext, WindowOptions,
+};
 
 #[derive(Params, Serialize, Deserialize, Clone)]
 struct GainParams {
@@ -26,7 +34,7 @@ pub struct Gain {
 
 impl Plugin for Gain {
     type Engine = GainEngine;
-    type View = PluginWindow;
+    type View = GainView;
 
     fn info() -> PluginInfo {
         PluginInfo {
@@ -84,13 +92,8 @@ impl Plugin for Gain {
         }
     }
 
-    fn view(&mut self, _host: ViewHost, parent: &ParentWindow) -> Self::View {
-        let size = Size {
-            width: 512.0,
-            height: 512.0,
-        };
-
-        PluginWindow::open(parent, size).unwrap()
+    fn view(&mut self, host: ViewHost, parent: &ParentWindow) -> Self::View {
+        GainView::open(host, parent, &self.params).unwrap()
     }
 }
 
@@ -146,3 +149,179 @@ impl Engine for GainEngine {
         }
     }
 }
+
+struct Gesture {
+    start_mouse_pos: Point,
+    start_value: f32,
+}
+
+struct ViewState {
+    host: ViewHost,
+    params: Rc<RefCell<GainParams>>,
+    renderer: Renderer,
+    framebuffer: Vec<u32>,
+    mouse_pos: Point,
+    gesture: Option<Gesture>,
+}
+
+impl ViewState {
+    fn new(host: ViewHost, params: Rc<RefCell<GainParams>>) -> ViewState {
+        ViewState {
+            host,
+            params,
+            renderer: Renderer::new(),
+            framebuffer: Vec::new(),
+            mouse_pos: Point { x: -1.0, y: -1.0 },
+            gesture: None,
+        }
+    }
+
+    fn update_cursor(&self, window: &Window) {
+        let pos = self.mouse_pos;
+        if pos.x >= 96.0 && pos.x < 160.0 && pos.y >= 96.0 && pos.y < 160.0 {
+            window.set_cursor(Cursor::SizeNs);
+        } else {
+            window.set_cursor(Cursor::Arrow);
+        }
+    }
+
+    fn handle_event(&mut self, cx: &WindowContext, event: reflector::platform::Event) -> Response {
+        use reflector::graphics::{Affine, Color, Path, Point};
+        use reflector::platform::Event;
+
+        match event {
+            Event::Frame => {
+                let scale = cx.window().scale();
+                let size = cx.window().size();
+                let width = (size.width * scale) as usize;
+                let height = (size.height * scale) as usize;
+                self.framebuffer.resize(width * height, 0xFF000000);
+
+                let mut canvas = self.renderer.canvas(&mut self.framebuffer, width, height);
+
+                canvas.clear(Color::rgba(21, 26, 31, 255));
+
+                let transform = Affine::scale(scale as f32);
+
+                let value = self.params.borrow().gain;
+
+                let center = Point::new(128.0, 128.0);
+                let radius = 32.0;
+                let angle1 = 0.75 * std::f32::consts::PI;
+                let angle2 = angle1 + value * 1.5 * std::f32::consts::PI;
+                let mut path = Path::new();
+                path.move_to(center + radius * Point::new(angle1.cos(), angle1.sin()));
+                path.arc(radius, angle1, angle2);
+                path.line_to(center + (radius - 4.0) * Point::new(angle2.cos(), angle2.sin()));
+                path.arc(radius - 4.0, angle2, angle1);
+                path.close();
+                canvas.fill_path(&path, transform, Color::rgba(240, 240, 245, 255));
+
+                let center = Point::new(128.0, 128.0);
+                let radius = 32.0;
+                let angle = 0.75 * std::f32::consts::PI;
+                let span = 1.5 * std::f32::consts::PI;
+                let mut path = Path::new();
+                path.move_to(center + radius * Point::new(angle.cos(), angle.sin()));
+                path.arc(radius, angle, angle + span);
+                path.line_to(center + (radius - 4.0) * Point::new(-angle.cos(), angle.sin()));
+                path.arc(radius - 4.0, angle + span, angle);
+                path.close();
+                canvas.stroke_path(&path, 1.0, transform, Color::rgba(240, 240, 245, 255));
+
+                cx.window().present(Bitmap::new(&self.framebuffer, width, height));
+            }
+            Event::MouseMove(pos) => {
+                self.mouse_pos = pos;
+                if let Some(gesture) = &self.gesture {
+                    let delta = -0.005 * (pos.y - gesture.start_mouse_pos.y) as f32;
+                    let new_value = (gesture.start_value + delta).clamp(0.0, 1.0);
+                    self.host.set_param(0, new_value as f64);
+                    self.params.borrow_mut().gain = new_value;
+                } else {
+                    self.update_cursor(cx.window());
+                }
+            }
+            Event::MouseDown(button) => {
+                if button == MouseButton::Left {
+                    let pos = self.mouse_pos;
+                    if pos.x >= 96.0 && pos.x < 160.0 && pos.y >= 96.0 && pos.y < 160.0 {
+                        cx.window().set_cursor(Cursor::SizeNs);
+                        self.host.begin_gesture(0);
+                        let value = self.params.borrow().gain;
+                        self.host.set_param(0, value as f64);
+                        self.params.borrow_mut().gain = value;
+                        self.gesture = Some(Gesture {
+                            start_mouse_pos: pos,
+                            start_value: value,
+                        });
+                        return Response::Capture;
+                    }
+                }
+            }
+            Event::MouseUp(button) => {
+                if button == MouseButton::Left {
+                    if self.gesture.is_some() {
+                        self.host.end_gesture(0);
+                        self.gesture = None;
+                        self.update_cursor(cx.window());
+                        return Response::Capture;
+                    }
+                }
+            }
+            _ => {}
+        }
+
+        Response::Ignore
+    }
+}
+
+pub struct GainView {
+    #[allow(unused)]
+    app: App,
+    window: Window,
+    params: Rc<RefCell<GainParams>>,
+}
+
+impl GainView {
+    fn open(host: ViewHost, parent: &ParentWindow, params: &GainParams) -> Result<GainView> {
+        let app = AppOptions::new().mode(AppMode::Guest).build()?;
+
+        let mut options = WindowOptions::new();
+        options.size(reflector::platform::Size::new(256.0, 256.0));
+
+        let raw_parent = match parent.as_raw() {
+            RawParent::Win32(window) => RawWindow::Win32(window),
+            RawParent::Cocoa(view) => RawWindow::Cocoa(view),
+            RawParent::X11(window) => RawWindow::X11(window),
+        };
+        unsafe { options.raw_parent(raw_parent) };
+
+        let params = Rc::new(RefCell::new(params.clone()));
+        let mut state = ViewState::new(host, Rc::clone(&params));
+        let window = options.open(app.handle(), move |cx, event| state.handle_event(cx, event))?;
+
+        window.show();
+
+        Ok(GainView {
+            app,
+            window,
+            params,
+        })
+    }
+}
+
+impl View for GainView {
+    fn size(&self) -> Size {
+        let size = self.window.size();
+
+        Size {
+            width: size.width,
+            height: size.height,
+        }
+    }
+
+    fn param_changed(&mut self, id: ParamId, value: ParamValue) {
+        self.params.borrow_mut().set_param(id, value);
+    }
+}