Add monitor support for win32

src/win32/monitor.rs

@@ -0,0 +1,79 @@
+use super::ffi;
+
+pub struct MonitorID {
+    name: [ffi::WCHAR, ..32],
+    readable_name: String,
+    flags: ffi::DWORD,
+    position: (uint, uint),
+}
+
+pub fn get_available_monitors() -> Vec<MonitorID> {
+    use std::{iter, mem, ptr};
+
+    let mut result = Vec::new();
+
+    for id in iter::count(0u, 1) {
+        let mut output: ffi::DISPLAY_DEVICEW = unsafe { mem::zeroed() };
+        output.cb = mem::size_of::<ffi::DISPLAY_DEVICEW>() as ffi::DWORD;
+
+        if unsafe { ffi::EnumDisplayDevicesW(ptr::null(), id as ffi::DWORD, &mut output, 0) } == 0 {
+            break
+        }
+
+        if  (output.StateFlags & ffi::DISPLAY_DEVICE_ACTIVE) == 0 ||
+            (output.StateFlags & ffi::DISPLAY_DEVICE_MIRRORING_DRIVER) != 0
+        {
+            continue
+        }
+
+        let readable_name = String::from_utf16_lossy(output.DeviceString.as_slice());
+        let readable_name = readable_name.as_slice().trim_right_chars(0 as char).to_string();
+
+        let position = unsafe {
+            let mut dev: ffi::DEVMODE = mem::zeroed();
+            dev.dmSize = mem::size_of::<ffi::DEVMODE>() as ffi::WORD;
+
+            if ffi::EnumDisplaySettingsExW(output.DeviceName.as_ptr(), ffi::ENUM_CURRENT_SETTINGS,
+                &mut dev, 0) == 0
+            {
+                continue
+            }
+
+            let point: &ffi::POINTL = mem::transmute(&dev.union1);
+            (point.x as uint, point.y as uint)
+        };
+
+        result.push(MonitorID {
+            name: output.DeviceName,
+            readable_name: readable_name,
+            flags: output.StateFlags,
+            position: position,
+        });
+    }
+
+    result
+}
+
+pub fn get_primary_monitor() -> MonitorID {
+    for monitor in get_available_monitors().move_iter() {
+        if (monitor.flags & ffi::DISPLAY_DEVICE_PRIMARY_DEVICE) != 0 {
+            return monitor
+        }
+    }
+
+    fail!("Failed to find the primary monitor")
+}
+
+impl MonitorID {
+    pub fn get_name(&self) -> Option<String> {
+        Some(self.readable_name.clone())
+    }
+
+    pub fn get_system_name(&self) -> &[ffi::WCHAR] {
+        self.name.as_slice()
+    }
+
+    pub fn get_position(&self) -> (uint, uint) {
+        self.position
+    }
+}