win_hook_event.cpp

#include "pch.h"
#include "win_hook_event.h"
#include "powertoy_module.h"
#include <mutex>
#include <deque>
#include <thread>

static std::mutex mutex;
static std::deque<WinHookEvent> hook_events;
static std::condition_variable dispatch_cv;

void intercept_system_menu_action(intptr_t);

static void CALLBACK win_hook_event_proc(HWINEVENTHOOK winEventHook,
                                         DWORD event,
                                         HWND window,
                                         LONG object,
                                         LONG child,
                                         DWORD eventThread,
                                         DWORD eventTime)
{
    std::unique_lock lock(mutex);
    hook_events.push_back({ event,
                            window,
                            object,
                            child,
                            eventThread,
                            eventTime });
    lock.unlock();
    dispatch_cv.notify_one();
}

static bool running = false;
static std::thread dispatch_thread;
static void dispatch_thread_proc()
{
    std::unique_lock lock(mutex);
    while (running)
    {
        dispatch_cv.wait(lock, [] { return !running || !hook_events.empty(); });
        if (!running)
            return;
        while (!hook_events.empty())
        {
            auto event = hook_events.front();
            hook_events.pop_front();
            lock.unlock();
            intptr_t data = reinterpret_cast<intptr_t>(&event);
            intercept_system_menu_action(data);
            powertoys_events().signal_event(win_hook_event, data);
            lock.lock();
        }
    }
}

static HWINEVENTHOOK hook_handle;

void start_win_hook_event()
{
    std::lock_guard lock(mutex);
    if (running)
        return;
    running = true;
    dispatch_thread = std::thread(dispatch_thread_proc);
    hook_handle = SetWinEventHook(EVENT_MIN, EVENT_MAX, nullptr, win_hook_event_proc, 0, 0, WINEVENT_OUTOFCONTEXT | WINEVENT_SKIPOWNPROCESS);
}

void stop_win_hook_event()
{
    std::unique_lock lock(mutex);
    if (!running)
        return;
    running = false;
    UnhookWinEvent(hook_handle);
    lock.unlock();
    dispatch_cv.notify_one();
    dispatch_thread.join();
    lock.lock();
    hook_events.clear();
    hook_events.shrink_to_fit();
}

void intercept_system_menu_action(intptr_t data)
{
    WinHookEvent* evt = reinterpret_cast<WinHookEvent*>(data);
    if (evt->event == EVENT_SYSTEM_MENUSTART || evt->event == EVENT_OBJECT_INVOKED)
    {
        powertoys_events().handle_system_menu_action(*evt);
    }
}