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
132
133
134
|
use winapi;
use user32;
use std::collections::VecDeque;
/// Win32 implementation of the main `MonitorID` object.
pub struct MonitorID {
/// The system name of the monitor.
name: [winapi::WCHAR; 32],
/// Name to give to the user.
readable_name: String,
/// See the `StateFlags` element here:
/// http://msdn.microsoft.com/en-us/library/dd183569(v=vs.85).aspx
flags: winapi::DWORD,
/// The position of the monitor in pixels on the desktop.
///
/// A window that is positionned at these coordinates will overlap the monitor.
position: (u32, u32),
/// The current resolution in pixels on the monitor.
dimensions: (u32, u32),
}
/// Win32 implementation of the main `get_available_monitors` function.
pub fn get_available_monitors() -> VecDeque<MonitorID> {
use std::{iter, mem, ptr};
// return value
let mut result = VecDeque::new();
// enumerating the devices is done by querying device 0, then device 1, then device 2, etc.
// until the query function returns null
for id in iter::count(0u32, 1) {
// getting the DISPLAY_DEVICEW object of the current device
let output = {
let mut output: winapi::DISPLAY_DEVICEW = unsafe { mem::zeroed() };
output.cb = mem::size_of::<winapi::DISPLAY_DEVICEW>() as winapi::DWORD;
if unsafe { user32::EnumDisplayDevicesW(ptr::null(),
id as winapi::DWORD, &mut output, 0) } == 0
{
// the device doesn't exist, which means we have finished enumerating
break;
}
if (output.StateFlags & winapi::DISPLAY_DEVICE_ACTIVE) == 0 ||
(output.StateFlags & winapi::DISPLAY_DEVICE_MIRRORING_DRIVER) != 0
{
// the device is not active
// the Win32 api usually returns a lot of inactive devices
continue;
}
output
};
// computing the human-friendly name
let readable_name = String::from_utf16_lossy(output.DeviceString.as_slice());
let readable_name = readable_name.as_slice().trim_right_matches(0 as char).to_string();
// getting the position
let (position, dimensions) = unsafe {
let mut dev: winapi::DEVMODEW = mem::zeroed();
dev.dmSize = mem::size_of::<winapi::DEVMODEW>() as winapi::WORD;
if user32::EnumDisplaySettingsExW(output.DeviceName.as_ptr(), winapi::ENUM_CURRENT_SETTINGS,
&mut dev, 0) == 0
{
continue;
}
let point: &winapi::POINTL = mem::transmute(&dev.union1);
let position = (point.x as u32, point.y as u32);
let dimensions = (dev.dmPelsWidth as u32, dev.dmPelsHeight as u32);
(position, dimensions)
};
// adding to the resulting list
result.push_back(MonitorID {
name: output.DeviceName,
readable_name: readable_name,
flags: output.StateFlags,
position: position,
dimensions: dimensions,
});
}
result
}
/// Win32 implementation of the main `get_primary_monitor` function.
pub fn get_primary_monitor() -> MonitorID {
// we simply get all available monitors and return the one with the `PRIMARY_DEVICE` flag
// TODO: it is possible to query the win32 API for the primary monitor, this should be done
// instead
for monitor in get_available_monitors().into_iter() {
if (monitor.flags & winapi::DISPLAY_DEVICE_PRIMARY_DEVICE) != 0 {
return monitor
}
}
panic!("Failed to find the primary monitor")
}
impl MonitorID {
/// See the docs if the crate root file.
pub fn get_name(&self) -> Option<String> {
Some(self.readable_name.clone())
}
/// See the docs if the crate root file.
pub fn get_dimensions(&self) -> (u32, u32) {
// TODO: retreive the dimensions every time this is called
self.dimensions
}
/// This is a Win32-only function for `MonitorID` that returns the system name of the device.
pub fn get_system_name(&self) -> &[winapi::WCHAR] {
// TODO: retreive the position every time this is called
self.name.as_slice()
}
/// This is a Win32-only function for `MonitorID` that returns the position of the
/// monitor on the desktop.
/// A window that is positionned at these coordinates will overlap the monitor.
pub fn get_position(&self) -> (u32, u32) {
self.position
}
}
|
