fn mouse_motion()

in src/platform_impl/macos/view.rs [915:962]

• 39 lines of code
• 6 McCabe index (conditional complexity)

fn mouse_motion(this: &Object, event: id) {
    unsafe {
        let state_ptr: *mut c_void = *this.get_ivar("winitState");
        let state = &mut *(state_ptr as *mut ViewState);

        // We have to do this to have access to the `NSView` trait...
        let view: id = this as *const _ as *mut _;

        let window_point = event.locationInWindow();
        let view_point = view.convertPoint_fromView_(window_point, nil);
        let view_rect = NSView::frame(view);

        if view_point.x.is_sign_negative()
            || view_point.y.is_sign_negative()
            || view_point.x > view_rect.size.width
            || view_point.y > view_rect.size.height
        {
            let mouse_buttons_down: NSInteger = msg_send![class!(NSEvent), pressedMouseButtons];
            if mouse_buttons_down == 0 {
                // Point is outside of the client area (view) and no buttons are pressed
                return;
            }
        }

        let x = view_point.x as f64;
        let y = view_rect.size.height as f64 - view_point.y as f64;
        let logical_position = LogicalPosition::new(x, y);

        update_potentially_stale_modifiers(state, event);
        let mouse_location = cocoa::appkit::NSEvent::mouseLocation(event);
        let screen_height = CGDisplay::main().pixels_high();
        let screen_relative_position = LogicalPosition::new(mouse_location.x,
                                                            screen_height as f64 - mouse_location.y)
            .to_physical(state.get_scale_factor());

        let window_event = Event::WindowEvent {
            window_id: WindowId(get_window_id(state.ns_window)),
            event: WindowEvent::CursorMoved {
                device_id: DEVICE_ID,
                position: logical_position.to_physical(state.get_scale_factor()),
                screen_relative_position: Some(screen_relative_position),
                modifiers: event_mods(event),
            },
        };

        AppState::queue_event(EventWrapper::StaticEvent(window_event));
    }
}