Vendor things

third-party/vendor/winit/examples/mouse_wheel.rs

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+#![allow(clippy::single_match)]
+
+use simple_logger::SimpleLogger;
+use winit::{
+    event::{Event, WindowEvent},
+    event_loop::EventLoop,
+    window::WindowBuilder,
+};
+
+fn main() {
+    SimpleLogger::new().init().unwrap();
+    let event_loop = EventLoop::new();
+
+    let window = WindowBuilder::new()
+        .with_title("Mouse Wheel events")
+        .build(&event_loop)
+        .unwrap();
+
+    println!(
+        r"
+When using so called 'natural scrolling' (scrolling that acts like on a touch screen), this is what to expect:
+
+Moving your finger downwards on a scroll wheel should make the window move down, and you should see a positive Y scroll value.
+
+When moving fingers on a trackpad down and to the right, you should see positive X and Y deltas, and the window should move down and to the right.
+
+With reverse scrolling, you should see the inverse behavior.
+
+In both cases the example window should move like the content of a scroll area in any other application.
+
+In other words, the deltas indicate the direction in which to move the content (in this case the window)."
+    );
+
+    event_loop.run(move |event, _, control_flow| {
+        control_flow.set_wait();
+
+        match event {
+            Event::WindowEvent { event, .. } => match event {
+                WindowEvent::CloseRequested => control_flow.set_exit(),
+                WindowEvent::MouseWheel { delta, .. } => match delta {
+                    winit::event::MouseScrollDelta::LineDelta(x, y) => {
+                        println!("mouse wheel Line Delta: ({x},{y})");
+                        let pixels_per_line = 120.0;
+                        let mut pos = window.outer_position().unwrap();
+                        pos.x += (x * pixels_per_line) as i32;
+                        pos.y += (y * pixels_per_line) as i32;
+                        window.set_outer_position(pos)
+                    }
+                    winit::event::MouseScrollDelta::PixelDelta(p) => {
+                        println!("mouse wheel Pixel Delta: ({},{})", p.x, p.y);
+                        let mut pos = window.outer_position().unwrap();
+                        pos.x += p.x as i32;
+                        pos.y += p.y as i32;
+                        window.set_outer_position(pos)
+                    }
+                },
+                _ => (),
+            },
+            _ => (),
+        }
+    });
+}