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CGEventTap: Allow dropping events from callback #492

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CGEventTap: Allow dropping events from callback #492

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30 changes: 18 additions & 12 deletions core-graphics/src/event.rs
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Expand Up @@ -8,6 +8,7 @@ use foreign_types::ForeignType;
use geometry::CGPoint;
use libc::c_void;
use std::mem::ManuallyDrop;
use std::ptr;

pub type CGEventField = u32;
pub type CGKeyCode = u16;
Expand Down Expand Up @@ -414,8 +415,13 @@ macro_rules! CGEventMaskBit {
}

pub type CGEventTapProxy = *const c_void;
pub enum CGEventTapCallbackResult {
Replace(CGEvent),
Keep,
Drop,
}
pub type CGEventTapCallBackFn<'tap_life> =
Box<dyn Fn(CGEventTapProxy, CGEventType, &CGEvent) -> Option<CGEvent> + 'tap_life>;
Box<dyn Fn(CGEventTapProxy, CGEventType, &CGEvent) -> CGEventTapCallbackResult + 'tap_life>;
type CGEventTapCallBackInternal = unsafe extern "C" fn(
proxy: CGEventTapProxy,
etype: CGEventType,
Expand All @@ -431,20 +437,21 @@ unsafe extern "C" fn cg_event_tap_callback_internal(
_user_info: *const c_void,
) -> ::sys::CGEventRef {
let callback = _user_info as *mut CGEventTapCallBackFn;
let event = CGEvent::from_ptr(_event);
let event = ManuallyDrop::new(CGEvent::from_ptr(_event));
let new_event = (*callback)(_proxy, _etype, &event);
let event = match new_event {
Some(new_event) => new_event,
None => event,
};
ManuallyDrop::new(event).as_ptr()
use self::CGEventTapCallbackResult::*;
match new_event {
Replace(new_event) => ManuallyDrop::new(new_event).as_ptr(),
Keep => _event,
Drop => ptr::null_mut(),
}
}


/// ```no_run
///extern crate core_foundation;
///use core_foundation::runloop::{kCFRunLoopCommonModes, CFRunLoop};
///use core_graphics::event::{CGEventTap, CGEventTapLocation, CGEventTapPlacement, CGEventTapOptions, CGEventType};
///use core_graphics::event::{CGEventTap, CGEventTapLocation, CGEventTapPlacement, CGEventTapOptions, CGEventType, CGEventTapCallbackResult};
///let current = CFRunLoop::get_current();
///match CGEventTap::new(
/// CGEventTapLocation::HID,
Expand All @@ -453,7 +460,7 @@ unsafe extern "C" fn cg_event_tap_callback_internal(
/// vec![CGEventType::MouseMoved],
/// |_a, _b, d| {
/// println!("{:?}", d.location());
/// None
/// CGEventTapCallbackResult::Keep
/// },
/// ) {
/// Ok(tap) => unsafe {
Expand All @@ -470,12 +477,11 @@ unsafe extern "C" fn cg_event_tap_callback_internal(
/// ```
pub struct CGEventTap<'tap_life> {
pub mach_port: CFMachPort,
pub callback_ref:
Box<dyn Fn(CGEventTapProxy, CGEventType, &CGEvent) -> Option<CGEvent> + 'tap_life>,
pub callback_ref: CGEventTapCallBackFn<'tap_life>,
}

impl<'tap_life> CGEventTap<'tap_life> {
pub fn new<F: Fn(CGEventTapProxy, CGEventType, &CGEvent) -> Option<CGEvent> + 'tap_life>(
pub fn new<F: Fn(CGEventTapProxy, CGEventType, &CGEvent) -> CGEventTapCallbackResult + 'tap_life>(
tap: CGEventTapLocation,
place: CGEventTapPlacement,
options: CGEventTapOptions,
Expand Down