use winapi; use user32; use std::collections::RingBuf; /// 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() -> RingBuf { use std::{iter, mem, ptr}; // return value let mut result = RingBuf::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::() 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::() 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 { 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 } }