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

use crate::window::CursorIcon;

use super::*;

impl XConnection {
    pub fn set_cursor_icon(&self, window: ffi::Window, cursor: Option<CursorIcon>) {
        let cursor = *self
            .cursor_cache
            .lock()
            .unwrap()
            .entry(cursor)
            .or_insert_with(|| self.get_cursor(cursor));

        self.update_cursor(window, cursor);
    }

    fn create_empty_cursor(&self) -> ffi::Cursor {
        let data = 0;
        let pixmap = unsafe {
            let screen = (self.xlib.XDefaultScreen)(self.display);
            let window = (self.xlib.XRootWindow)(self.display, screen);
            (self.xlib.XCreateBitmapFromData)(self.display, window, &data, 1, 1)
        };

        if pixmap == 0 {
            panic!("failed to allocate pixmap for cursor");
        }

        unsafe {
            // We don't care about this color, since it only fills bytes
            // in the pixmap which are not 0 in the mask.
            let mut dummy_color = MaybeUninit::uninit();
            let cursor = (self.xlib.XCreatePixmapCursor)(
                self.display,
                pixmap,
                pixmap,
                dummy_color.as_mut_ptr(),
                dummy_color.as_mut_ptr(),
                0,
                0,
            );
            (self.xlib.XFreePixmap)(self.display, pixmap);

            cursor
        }
    }

    fn load_cursor(&self, name: &[u8]) -> ffi::Cursor {
        unsafe {
            (self.xcursor.XcursorLibraryLoadCursor)(self.display, name.as_ptr() as *const c_char)
        }
    }

    fn load_first_existing_cursor(&self, names: &[&[u8]]) -> ffi::Cursor {
        for name in names.iter() {
            let xcursor = self.load_cursor(name);
            if xcursor != 0 {
                return xcursor;
            }
        }
        0
    }

    fn get_cursor(&self, cursor: Option<CursorIcon>) -> ffi::Cursor {
        let cursor = match cursor {
            Some(cursor) => cursor,
            None => return self.create_empty_cursor(),
        };

        let load = |name: &[u8]| self.load_cursor(name);

        let loadn = |names: &[&[u8]]| self.load_first_existing_cursor(names);

        // Try multiple names in some cases where the name
        // differs on the desktop environments or themes.
        //
        // Try the better looking (or more suiting) names first.
        match cursor {
            CursorIcon::Alias => load(b"link\0"),
            CursorIcon::Arrow => load(b"arrow\0"),
            CursorIcon::Cell => load(b"plus\0"),
            CursorIcon::Copy => load(b"copy\0"),
            CursorIcon::Crosshair => load(b"crosshair\0"),
            CursorIcon::Default => load(b"left_ptr\0"),
            CursorIcon::Hand => loadn(&[b"hand2\0", b"hand1\0"]),
            CursorIcon::Help => load(b"question_arrow\0"),
            CursorIcon::Move => load(b"move\0"),
            CursorIcon::Grab => loadn(&[b"openhand\0", b"grab\0"]),
            CursorIcon::Grabbing => loadn(&[b"closedhand\0", b"grabbing\0"]),
            CursorIcon::Progress => load(b"left_ptr_watch\0"),
            CursorIcon::AllScroll => load(b"all-scroll\0"),
            CursorIcon::ContextMenu => load(b"context-menu\0"),

            CursorIcon::NoDrop => loadn(&[b"no-drop\0", b"circle\0"]),
            CursorIcon::NotAllowed => load(b"crossed_circle\0"),

            // Resize cursors
            CursorIcon::EResize => load(b"right_side\0"),
            CursorIcon::NResize => load(b"top_side\0"),
            CursorIcon::NeResize => load(b"top_right_corner\0"),
            CursorIcon::NwResize => load(b"top_left_corner\0"),
            CursorIcon::SResize => load(b"bottom_side\0"),
            CursorIcon::SeResize => load(b"bottom_right_corner\0"),
            CursorIcon::SwResize => load(b"bottom_left_corner\0"),
            CursorIcon::WResize => load(b"left_side\0"),
            CursorIcon::EwResize => load(b"h_double_arrow\0"),
            CursorIcon::NsResize => load(b"v_double_arrow\0"),
            CursorIcon::NwseResize => loadn(&[b"bd_double_arrow\0", b"size_fdiag\0"]),
            CursorIcon::NeswResize => loadn(&[b"fd_double_arrow\0", b"size_bdiag\0"]),
            CursorIcon::ColResize => loadn(&[b"split_h\0", b"h_double_arrow\0"]),
            CursorIcon::RowResize => loadn(&[b"split_v\0", b"v_double_arrow\0"]),

            CursorIcon::Text => loadn(&[b"text\0", b"xterm\0"]),
            CursorIcon::VerticalText => load(b"vertical-text\0"),

            CursorIcon::Wait => load(b"watch\0"),

            CursorIcon::ZoomIn => load(b"zoom-in\0"),
            CursorIcon::ZoomOut => load(b"zoom-out\0"),
        }
    }

    fn update_cursor(&self, window: ffi::Window, cursor: ffi::Cursor) {
        unsafe {
            (self.xlib.XDefineCursor)(self.display, window, cursor);

            self.flush_requests().expect("Failed to set the cursor");
        }
    }
}