x11rb/
wrapper.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
//! Some wrappers around the generated code to simplify use.

use super::cookie::VoidCookie;
use super::errors::{ConnectionError, ReplyError};
use super::protocol::xproto::{Atom, ConnectionExt as XProtoConnectionExt, PropMode, Window};

/// Extension trait that simplifies API use
pub trait ConnectionExt: XProtoConnectionExt {
    /// Change a property on a window with format 8.
    fn change_property8<A, B>(
        &self,
        mode: PropMode,
        window: Window,
        property: A,
        type_: B,
        data: &[u8],
    ) -> Result<VoidCookie<'_, Self>, ConnectionError>
    where
        A: Into<Atom>,
        B: Into<Atom>,
    {
        self.change_property(
            mode,
            window,
            property,
            type_,
            8,
            data.len().try_into().expect("`data` has too many elements"),
            data,
        )
    }

    /// Change a property on a window with format 16.
    fn change_property16<A, B>(
        &self,
        mode: PropMode,
        window: Window,
        property: A,
        type_: B,
        data: &[u16],
    ) -> Result<VoidCookie<'_, Self>, ConnectionError>
    where
        A: Into<Atom>,
        B: Into<Atom>,
    {
        let mut data_u8 = Vec::with_capacity(data.len() * 2);
        for item in data {
            data_u8.extend(item.to_ne_bytes());
        }
        self.change_property(
            mode,
            window,
            property,
            type_,
            16,
            data.len().try_into().expect("`data` has too many elements"),
            &data_u8,
        )
    }

    /// Change a property on a window with format 32.
    fn change_property32<A, B>(
        &self,
        mode: PropMode,
        window: Window,
        property: A,
        type_: B,
        data: &[u32],
    ) -> Result<VoidCookie<'_, Self>, ConnectionError>
    where
        A: Into<Atom>,
        B: Into<Atom>,
    {
        let mut data_u8 = Vec::with_capacity(data.len() * 4);
        for item in data {
            data_u8.extend(item.to_ne_bytes());
        }
        self.change_property(
            mode,
            window,
            property,
            type_,
            32,
            data.len().try_into().expect("`data` has too many elements"),
            &data_u8,
        )
    }

    /// Synchronise with the X11 server.
    ///
    /// This function synchronises with the X11 server. This means that all requests that are still
    /// in the output buffer are sent to the server. Then, we wait until the X11 server processed
    /// all requests.
    fn sync(&self) -> Result<(), ReplyError> {
        // When a new request is generated, it is appended to the output buffer. Thus, this causes
        // all previous requests to be sent.
        // The X11 server is single-threaded and processes requests in-order. Thus, it will only
        // reply to our GetInputFocus after everything before was processed.
        self.get_input_focus()?.reply().and(Ok(()))
    }
}
impl<C: XProtoConnectionExt + ?Sized> ConnectionExt for C {}

/// A RAII-like wrapper around [super::protocol::xproto::grab_server] and
/// [super::protocol::xproto::ungrab_server].
///
/// Instances of this struct represent that we sent a [super::protocol::xproto::grab_server]
/// request. When this struct is dropped, an [super::protocol::xproto::ungrab_server] request is
/// sent.
///
/// Any errors during `Drop` are silently ignored. Most likely an error here means that your
/// X11 connection is broken and later requests will also fail.
#[derive(Debug)]
pub struct GrabServer<'c, C: XProtoConnectionExt>(&'c C);

impl<'c, C: XProtoConnectionExt> GrabServer<'c, C> {
    /// Grab the server by sending a [super::protocol::xproto::grab_server] request.
    ///
    /// The returned type will call [super::protocol::xproto::ungrab_server] when it is dropped.
    pub fn grab(conn: &'c C) -> Result<Self, ConnectionError> {
        // Grab the server, return any errors, ignore the resulting VoidCookie
        drop(conn.grab_server()?);
        Ok(Self(conn))
    }
}

impl<C: XProtoConnectionExt> Drop for GrabServer<'_, C> {
    fn drop(&mut self) {
        let _ = (self.0).ungrab_server();
    }
}