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Reverse horizontal scroll direction (#2105)

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Emil Ernerfeldt 2022-03-13 14:22:02 +01:00 • committed by GitHub
parent 1c68be0631
commit 85baf79d17
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8 changed files with 46 additions and 26 deletions
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30
examples/mouse_wheel.rs
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@ -1,6 +1,6 @@
use simple_logger::SimpleLogger;
use winit::{
event::{DeviceEvent, Event, WindowEvent},
event::{Event, WindowEvent},
event_loop::{ControlFlow, EventLoop},
window::WindowBuilder,
};
@ -14,29 +14,41 @@ fn main() {
.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 = ControlFlow::Wait;
match event {
Event::WindowEvent { event, .. } => match event {
WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
_ => (),
},
Event::DeviceEvent { event, .. } => match event {
DeviceEvent::MouseWheel { delta } => match delta {
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;
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;
pos.x += p.x as i32;
pos.y += p.y as i32;
window.set_outer_position(pos)
}
},