1use std::ffi::{c_uint, c_void};
 2
 3use util::ResultExt;
 4use windows::Win32::UI::WindowsAndMessaging::{
 5    SystemParametersInfoW, SPI_GETWHEELSCROLLCHARS, SPI_GETWHEELSCROLLLINES,
 6    SYSTEM_PARAMETERS_INFO_UPDATE_FLAGS,
 7};
 8
 9/// Windows settings pulled from SystemParametersInfo
10/// https://learn.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-systemparametersinfow
11#[derive(Default, Debug, Clone, Copy)]
12pub(crate) struct WindowsSystemSettings {
13    pub(crate) mouse_wheel_settings: MouseWheelSettings,
14}
15
16#[derive(Default, Debug, Clone, Copy)]
17pub(crate) struct MouseWheelSettings {
18    /// SEE: SPI_GETWHEELSCROLLCHARS
19    pub(crate) wheel_scroll_chars: u32,
20    /// SEE: SPI_GETWHEELSCROLLLINES
21    pub(crate) wheel_scroll_lines: u32,
22}
23
24impl WindowsSystemSettings {
25    pub(crate) fn new() -> Self {
26        let mut settings = Self::default();
27        settings.init();
28        settings
29    }
30
31    fn init(&mut self) {
32        self.mouse_wheel_settings.update();
33    }
34}
35
36impl MouseWheelSettings {
37    pub(crate) fn update(&mut self) {
38        self.update_wheel_scroll_chars();
39        self.update_wheel_scroll_lines();
40    }
41
42    fn update_wheel_scroll_chars(&mut self) {
43        let mut value = c_uint::default();
44        let result = unsafe {
45            SystemParametersInfoW(
46                SPI_GETWHEELSCROLLCHARS,
47                0,
48                Some((&mut value) as *mut c_uint as *mut c_void),
49                SYSTEM_PARAMETERS_INFO_UPDATE_FLAGS::default(),
50            )
51        };
52
53        if result.log_err() != None && self.wheel_scroll_chars != value {
54            self.wheel_scroll_chars = value;
55        }
56    }
57
58    fn update_wheel_scroll_lines(&mut self) {
59        let mut value = c_uint::default();
60        let result = unsafe {
61            SystemParametersInfoW(
62                SPI_GETWHEELSCROLLLINES,
63                0,
64                Some((&mut value) as *mut c_uint as *mut c_void),
65                SYSTEM_PARAMETERS_INFO_UPDATE_FLAGS::default(),
66            )
67        };
68
69        if result.log_err() != None && self.wheel_scroll_lines != value {
70            self.wheel_scroll_lines = value;
71        }
72    }
73}