Event Loop 2.0 API and Windows implementation (#638)
* Rename EventsLoop and associated types to EventLoop * Rename WindowEvent::Refresh to WindowEvent::Redraw * Remove second thread from win32 backend * Update run_forever to hijack thread * Replace windows Mutex with parking_lot Mutex * Implement new ControlFlow and associated events * Add StartCause::Init support, timer example * Add ability to send custom user events * Fully invert windows control flow so win32 calls into winit's callback * Add request_redraw * Rename platform to platform_impl * Rename os to platform, add Ext trait postfixes * Add platform::desktop module with EventLoopExt::run_return * Re-organize into module structure * Improve documentation * Small changes to examples * Improve docs for run and run_return * Change instances of "events_loop" to "event_loop" * Rename MonitorId to MonitorHandle * Add CHANGELOG entry * Improve WaitUntil timer precision * When SendEvent is called during event closure, buffer events * Fix resize lag when waiting in some situations * Update send test and errors that broke some examples/APIs * Improve clarity/fix typos in docs * Fix unreachable panic after setting ControlFlow to Poll during some RedrawRequested events. * Fix crash when running in release mode * Remove crossbeam dependency and make drop events work again * Remove serde implementations from ControlFlow * Fix 1.24.1 build * Fix freeze when setting decorations * Replace &EventLoop in callback with &EventLoopWindowTarget * Document and implement Debug for EventLoopWindowTarget * Fix some deadlocks that could occur when changing window state * Fix thread executor not executing closure when called from non-loop thread * Fix buffered events not getting dispatched * Fix crash with runner refcell not getting dropped * Address review feedback * Fix CHANGELOG typo * Catch panics in user callback
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92 changed files with 3467 additions and 1260 deletions
159
src/platform_impl/linux/x11/util/input.rs
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159
src/platform_impl/linux/x11/util/input.rs
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@ -0,0 +1,159 @@
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use std::str;
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use super::*;
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use events::ModifiersState;
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pub const VIRTUAL_CORE_POINTER: c_int = 2;
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pub const VIRTUAL_CORE_KEYBOARD: c_int = 3;
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// A base buffer size of 1kB uses a negligible amount of RAM while preventing us from having to
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// re-allocate (and make another round-trip) in the *vast* majority of cases.
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// To test if `lookup_utf8` works correctly, set this to 1.
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const TEXT_BUFFER_SIZE: usize = 1024;
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impl From<ffi::XIModifierState> for ModifiersState {
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fn from(mods: ffi::XIModifierState) -> Self {
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let state = mods.effective as c_uint;
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ModifiersState {
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alt: state & ffi::Mod1Mask != 0,
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shift: state & ffi::ShiftMask != 0,
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ctrl: state & ffi::ControlMask != 0,
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logo: state & ffi::Mod4Mask != 0,
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}
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}
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}
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pub struct PointerState<'a> {
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xconn: &'a XConnection,
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root: ffi::Window,
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child: ffi::Window,
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pub root_x: c_double,
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pub root_y: c_double,
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win_x: c_double,
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win_y: c_double,
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buttons: ffi::XIButtonState,
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modifiers: ffi::XIModifierState,
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group: ffi::XIGroupState,
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relative_to_window: bool,
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}
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impl<'a> PointerState<'a> {
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pub fn get_modifier_state(&self) -> ModifiersState {
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self.modifiers.into()
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}
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}
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impl<'a> Drop for PointerState<'a> {
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fn drop(&mut self) {
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if !self.buttons.mask.is_null() {
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unsafe {
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// This is why you need to read the docs carefully...
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(self.xconn.xlib.XFree)(self.buttons.mask as _);
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}
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}
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}
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}
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impl XConnection {
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pub fn select_xinput_events(&self, window: c_ulong, device_id: c_int, mask: i32) -> Flusher {
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let mut event_mask = ffi::XIEventMask {
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deviceid: device_id,
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mask: &mask as *const _ as *mut c_uchar,
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mask_len: mem::size_of_val(&mask) as c_int,
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};
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unsafe {
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(self.xinput2.XISelectEvents)(
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self.display,
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window,
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&mut event_mask as *mut ffi::XIEventMask,
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1, // number of masks to read from pointer above
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);
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}
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Flusher::new(self)
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}
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#[allow(dead_code)]
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pub fn select_xkb_events(&self, device_id: c_uint, mask: c_ulong) -> Option<Flusher> {
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let status = unsafe {
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(self.xlib.XkbSelectEvents)(
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self.display,
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device_id,
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mask,
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mask,
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)
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};
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if status == ffi::True {
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Some(Flusher::new(self))
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} else {
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None
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}
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}
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pub fn query_pointer(&self, window: ffi::Window, device_id: c_int) -> Result<PointerState, XError> {
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unsafe {
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let mut pointer_state: PointerState = mem::uninitialized();
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pointer_state.xconn = self;
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pointer_state.relative_to_window = (self.xinput2.XIQueryPointer)(
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self.display,
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device_id,
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window,
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&mut pointer_state.root,
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&mut pointer_state.child,
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&mut pointer_state.root_x,
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&mut pointer_state.root_y,
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&mut pointer_state.win_x,
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&mut pointer_state.win_y,
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&mut pointer_state.buttons,
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&mut pointer_state.modifiers,
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&mut pointer_state.group,
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) == ffi::True;
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if let Err(err) = self.check_errors() {
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// Running the destrutor would be bad news for us...
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mem::forget(pointer_state);
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Err(err)
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} else {
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Ok(pointer_state)
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}
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}
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}
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fn lookup_utf8_inner(
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&self,
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ic: ffi::XIC,
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key_event: &mut ffi::XKeyEvent,
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buffer: &mut [u8],
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) -> (ffi::KeySym, ffi::Status, c_int) {
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let mut keysym: ffi::KeySym = 0;
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let mut status: ffi::Status = 0;
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let count = unsafe {
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(self.xlib.Xutf8LookupString)(
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ic,
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key_event,
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buffer.as_mut_ptr() as *mut c_char,
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buffer.len() as c_int,
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&mut keysym,
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&mut status,
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)
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};
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(keysym, status, count)
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}
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pub fn lookup_utf8(&self, ic: ffi::XIC, key_event: &mut ffi::XKeyEvent) -> String {
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let mut buffer: [u8; TEXT_BUFFER_SIZE] = unsafe { mem::uninitialized() };
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let (_, status, count) = self.lookup_utf8_inner(ic, key_event, &mut buffer);
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// The buffer overflowed, so we'll make a new one on the heap.
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if status == ffi::XBufferOverflow {
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let mut buffer = Vec::with_capacity(count as usize);
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unsafe { buffer.set_len(count as usize) };
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let (_, _, new_count) = self.lookup_utf8_inner(ic, key_event, &mut buffer);
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debug_assert_eq!(count, new_count);
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str::from_utf8(&buffer[..count as usize])
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.unwrap_or("")
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.to_string()
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} else {
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str::from_utf8(&buffer[..count as usize])
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.unwrap_or("")
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.to_string()
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}
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}
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}
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