Add configuration to invert zoom direction

crates/fj-app/src/config.rs

@@ -11,6 +11,7 @@ use serde::Deserialize;
 pub struct Config {
     pub default_path: Option<PathBuf>,
     pub default_model: Option<PathBuf>,
+    pub invert_zoom: Option<bool>,
 }
 
 impl Config {

crates/fj-app/src/main.rs

@@ -80,11 +80,13 @@ fn main() -> anyhow::Result<()> {
         return Ok(());
     }
 
+    let invert_zoom = config.invert_zoom.unwrap_or(false);
+
     if let Some(model) = model {
         let watcher = model.load_and_watch(parameters)?;
-        run(Some(watcher), shape_processor, status)?;
+        run(Some(watcher), shape_processor, status, invert_zoom)?;
     } else {
-        run(None, shape_processor, status)?;
+        run(None, shape_processor, status, invert_zoom)?;
     }
 
     Ok(())

crates/fj-window/src/run.rs

@@ -32,6 +32,7 @@ pub fn run(
     watcher: Option<Watcher>,
     shape_processor: ShapeProcessor,
     mut status: StatusReport,
+    invert_zoom: bool,
 ) -> Result<(), Error> {
     let event_loop = EventLoop::new();
     let window = Window::new(&event_loop)?;
@@ -214,6 +215,7 @@ pub fn run(
             &window,
             &held_mouse_button,
             &mut previous_cursor,
+            invert_zoom,
         );
         if let (Some(input_event), Some(fp)) = (input_event, focus_point) {
             input_handler.handle_event(input_event, fp, &mut camera);
@@ -226,6 +228,7 @@ fn input_event(
     window: &Window,
     held_mouse_button: &Option<MouseButton>,
     previous_cursor: &mut Option<NormalizedPosition>,
+    invert_zoom: bool,
 ) -> Option<input::Event> {
     match event {
         Event::WindowEvent {
@@ -274,6 +277,8 @@ fn input_event(
                 }) => y * ZOOM_FACTOR_PIXEL,
             };
 
+            let delta = if invert_zoom { -delta } else { delta };
+
             Some(input::Event::Zoom(delta))
         }
         _ => None,

fj.toml

@@ -5,3 +5,7 @@ default_path = "models"
 # The default models that is loaded, if none is specified. If this is a relative
 # path, it should be relative to `default_path`.
 default_model = "test"
+
+# Indicate whether to invert the zoom direction. Can be used to override the
+# OS-level setting.
+invert_zoom = false