245 lines
8.5 KiB
Rust
245 lines
8.5 KiB
Rust
use std::sync::{Arc, Mutex};
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use std::io;
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use std::ptr;
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use std::mem;
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use std::thread;
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use super::callback;
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use super::WindowState;
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use super::Window;
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use super::MonitorId;
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use super::WindowWrapper;
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use CreationError;
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use CreationError::OsError;
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use CursorState;
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use WindowAttributes;
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use std::ffi::{OsStr};
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use std::os::windows::ffi::OsStrExt;
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use std::sync::mpsc::channel;
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use winapi;
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use kernel32;
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use dwmapi;
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use user32;
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pub fn new_window(window: &WindowAttributes) -> Result<Window, CreationError> {
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let window = window.clone();
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// initializing variables to be sent to the task
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let title = OsStr::new(&window.title).encode_wide().chain(Some(0).into_iter())
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.collect::<Vec<_>>();
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let (tx, rx) = channel();
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// `GetMessage` must be called in the same thread as CreateWindow, so we create a new thread
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// dedicated to this window.
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thread::spawn(move || {
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unsafe {
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// creating and sending the `Window`
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match init(title, &window) {
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Ok(w) => tx.send(Ok(w)).ok(),
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Err(e) => {
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tx.send(Err(e)).ok();
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return;
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}
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};
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// now that the `Window` struct is initialized, the main `Window::new()` function will
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// return and this events loop will run in parallel
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loop {
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let mut msg = mem::uninitialized();
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if user32::GetMessageW(&mut msg, ptr::null_mut(), 0, 0) == 0 {
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break;
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}
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user32::TranslateMessage(&msg);
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user32::DispatchMessageW(&msg); // calls `callback` (see the callback module)
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}
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}
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});
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rx.recv().unwrap()
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}
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unsafe fn init(title: Vec<u16>, window: &WindowAttributes) -> Result<Window, CreationError> {
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// registering the window class
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let class_name = register_window_class();
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// building a RECT object with coordinates
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let mut rect = winapi::RECT {
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left: 0, right: window.dimensions.unwrap_or((1024, 768)).0 as winapi::LONG,
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top: 0, bottom: window.dimensions.unwrap_or((1024, 768)).1 as winapi::LONG,
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};
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// switching to fullscreen if necessary
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// this means adjusting the window's position so that it overlaps the right monitor,
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// and change the monitor's resolution if necessary
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if window.monitor.is_some() {
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let monitor = window.monitor.as_ref().unwrap();
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try!(switch_to_fullscreen(&mut rect, monitor));
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}
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// computing the style and extended style of the window
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let (ex_style, style) = if window.monitor.is_some() || window.decorations == false {
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(winapi::WS_EX_APPWINDOW, winapi::WS_POPUP | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN)
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} else {
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(winapi::WS_EX_APPWINDOW | winapi::WS_EX_WINDOWEDGE,
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winapi::WS_OVERLAPPEDWINDOW | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN)
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};
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// adjusting the window coordinates using the style
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user32::AdjustWindowRectEx(&mut rect, style, 0, ex_style);
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// creating the real window this time, by using the functions in `extra_functions`
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let real_window = {
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let (width, height) = if window.monitor.is_some() || window.dimensions.is_some() {
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(Some(rect.right - rect.left), Some(rect.bottom - rect.top))
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} else {
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(None, None)
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};
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let (x, y) = if window.monitor.is_some() {
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(Some(rect.left), Some(rect.top))
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} else {
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(None, None)
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};
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let style = if !window.visible {
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style
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} else {
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style | winapi::WS_VISIBLE
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};
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let handle = user32::CreateWindowExW(ex_style | winapi::WS_EX_ACCEPTFILES,
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class_name.as_ptr(),
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title.as_ptr() as winapi::LPCWSTR,
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style | winapi::WS_CLIPSIBLINGS | winapi::WS_CLIPCHILDREN,
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x.unwrap_or(winapi::CW_USEDEFAULT), y.unwrap_or(winapi::CW_USEDEFAULT),
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width.unwrap_or(winapi::CW_USEDEFAULT), height.unwrap_or(winapi::CW_USEDEFAULT),
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ptr::null_mut(), ptr::null_mut(), kernel32::GetModuleHandleW(ptr::null()),
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ptr::null_mut());
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if handle.is_null() {
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return Err(OsError(format!("CreateWindowEx function failed: {}",
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format!("{}", io::Error::last_os_error()))));
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}
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let hdc = user32::GetDC(handle);
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if hdc.is_null() {
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return Err(OsError(format!("GetDC function failed: {}",
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format!("{}", io::Error::last_os_error()))));
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}
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WindowWrapper(handle, hdc)
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};
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// making the window transparent
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if window.transparent {
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let bb = winapi::DWM_BLURBEHIND {
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dwFlags: 0x1, // FIXME: DWM_BB_ENABLE;
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fEnable: 1,
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hRgnBlur: ptr::null_mut(),
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fTransitionOnMaximized: 0,
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};
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dwmapi::DwmEnableBlurBehindWindow(real_window.0, &bb);
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}
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// calling SetForegroundWindow if fullscreen
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if window.monitor.is_some() {
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user32::SetForegroundWindow(real_window.0);
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}
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// Creating a mutex to track the current window state
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let window_state = Arc::new(Mutex::new(WindowState {
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cursor: winapi::IDC_ARROW, // use arrow by default
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cursor_state: CursorState::Normal,
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attributes: window.clone()
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}));
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// filling the CONTEXT_STASH task-local storage so that we can start receiving events
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let events_receiver = {
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let (tx, rx) = channel();
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let mut tx = Some(tx);
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callback::CONTEXT_STASH.with(|context_stash| {
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let data = callback::ThreadLocalData {
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win: real_window.0,
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sender: tx.take().unwrap(),
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window_state: window_state.clone(),
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mouse_in_window: false
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};
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(*context_stash.borrow_mut()) = Some(data);
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});
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rx
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};
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// building the struct
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Ok(Window {
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window: real_window,
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events_receiver: events_receiver,
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window_state: window_state,
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})
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}
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unsafe fn register_window_class() -> Vec<u16> {
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let class_name = OsStr::new("Window Class").encode_wide().chain(Some(0).into_iter())
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.collect::<Vec<_>>();
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let class = winapi::WNDCLASSEXW {
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cbSize: mem::size_of::<winapi::WNDCLASSEXW>() as winapi::UINT,
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style: winapi::CS_HREDRAW | winapi::CS_VREDRAW | winapi::CS_OWNDC,
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lpfnWndProc: Some(callback::callback),
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cbClsExtra: 0,
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cbWndExtra: 0,
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hInstance: kernel32::GetModuleHandleW(ptr::null()),
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hIcon: ptr::null_mut(),
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hCursor: ptr::null_mut(), // must be null in order for cursor state to work properly
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hbrBackground: ptr::null_mut(),
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lpszMenuName: ptr::null(),
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lpszClassName: class_name.as_ptr(),
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hIconSm: ptr::null_mut(),
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};
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// We ignore errors because registering the same window class twice would trigger
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// an error, and because errors here are detected during CreateWindowEx anyway.
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// Also since there is no weird element in the struct, there is no reason for this
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// call to fail.
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user32::RegisterClassExW(&class);
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class_name
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}
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unsafe fn switch_to_fullscreen(rect: &mut winapi::RECT, monitor: &MonitorId)
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-> Result<(), CreationError>
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{
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// adjusting the rect
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{
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let pos = monitor.get_position();
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rect.left += pos.0 as winapi::LONG;
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rect.right += pos.0 as winapi::LONG;
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rect.top += pos.1 as winapi::LONG;
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rect.bottom += pos.1 as winapi::LONG;
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}
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// changing device settings
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let mut screen_settings: winapi::DEVMODEW = mem::zeroed();
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screen_settings.dmSize = mem::size_of::<winapi::DEVMODEW>() as winapi::WORD;
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screen_settings.dmPelsWidth = (rect.right - rect.left) as winapi::DWORD;
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screen_settings.dmPelsHeight = (rect.bottom - rect.top) as winapi::DWORD;
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screen_settings.dmBitsPerPel = 32; // TODO: ?
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screen_settings.dmFields = winapi::DM_BITSPERPEL | winapi::DM_PELSWIDTH | winapi::DM_PELSHEIGHT;
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let result = user32::ChangeDisplaySettingsExW(monitor.get_adapter_name().as_ptr(),
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&mut screen_settings, ptr::null_mut(),
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winapi::CDS_FULLSCREEN, ptr::null_mut());
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if result != winapi::DISP_CHANGE_SUCCESSFUL {
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return Err(OsError(format!("ChangeDisplaySettings failed: {}", result)));
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}
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Ok(())
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}
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