gdk/
device.rs

1// Take a look at the license at the top of the repository in the LICENSE file.
2
3use crate::Device;
4use crate::TimeCoord;
5use crate::Window;
6use crate::{AxisUse, ffi};
7use glib::object::IsA;
8use glib::translate::*;
9
10use std::mem;
11use std::ptr;
12
13pub trait DeviceExtManual: IsA<Device> + 'static {
14    #[doc(alias = "gdk_device_get_axis")]
15    #[doc(alias = "get_axis")]
16    fn is_axis(&self, axes: &mut [f64], use_: AxisUse, value: &mut f64) -> bool {
17        unsafe {
18            from_glib(ffi::gdk_device_get_axis(
19                self.as_ref().to_glib_none().0,
20                axes.as_mut_ptr(),
21                use_.into_glib(),
22                value,
23            ))
24        }
25    }
26
27    /// Obtains the motion history for a pointer device; given a starting and
28    /// ending timestamp, return all events in the motion history for
29    /// the device in the given range of time. Some windowing systems
30    /// do not support motion history, in which case, [`false`] will
31    /// be returned. (This is not distinguishable from the case where
32    /// motion history is supported and no events were found.)
33    ///
34    /// Note that there is also [`Window::set_event_compression()`][crate::Window::set_event_compression()] to get
35    /// more motion events delivered directly, independent of the windowing
36    /// system.
37    /// ## `window`
38    /// the window with respect to which which the event coordinates will be reported
39    /// ## `start`
40    /// starting timestamp for range of events to return
41    /// ## `stop`
42    /// ending timestamp for the range of events to return
43    ///
44    /// # Returns
45    ///
46    /// [`true`] if the windowing system supports motion history and
47    ///  at least one event was found.
48    ///
49    /// ## `events`
50    ///
51    ///  location to store a newly-allocated array of [`TimeCoord`][crate::TimeCoord], or
52    ///  [`None`]
53    #[doc(alias = "gdk_device_get_history")]
54    #[doc(alias = "get_history")]
55    fn history<P: IsA<Window>>(&self, window: &P, start: u32, stop: u32) -> Vec<TimeCoord> {
56        unsafe {
57            let mut events = ptr::null_mut();
58            let mut n_events = mem::MaybeUninit::uninit();
59            let ret: bool = from_glib(ffi::gdk_device_get_history(
60                self.as_ref().to_glib_none().0,
61                window.as_ref().to_glib_none().0,
62                start,
63                stop,
64                &mut events,
65                n_events.as_mut_ptr(),
66            ));
67            if !ret {
68                return Vec::new();
69            }
70            let n_events = n_events.assume_init() as usize;
71            FromGlibContainer::from_glib_full_num(events, n_events)
72        }
73    }
74}
75
76impl<O: IsA<Device>> DeviceExtManual for O {}
gdk/device.rs

gdk/
device.rs
