2020-09-21 18:44:16 +08:00
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#include "pch.h"
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#include "centralized_kb_hook.h"
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2020-10-20 01:49:17 +08:00
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#include <common/debug_control.h>
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2020-12-15 20:16:09 +08:00
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#include <common/utils/winapi_error.h>
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2020-09-21 18:44:16 +08:00
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namespace CentralizedKeyboardHook
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{
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struct HotkeyDescriptor
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{
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Hotkey hotkey;
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std::wstring moduleName;
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std::function<bool()> action;
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2020-12-15 20:16:09 +08:00
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bool operator<(const HotkeyDescriptor& other) const
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2020-09-21 18:44:16 +08:00
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{
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return hotkey < other.hotkey;
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};
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};
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std::multiset<HotkeyDescriptor> hotkeyDescriptors;
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std::mutex mutex;
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HHOOK hHook{};
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struct DestroyOnExit
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{
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~DestroyOnExit()
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{
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Stop();
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}
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} destroyOnExitObj;
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LRESULT CALLBACK KeyboardHookProc(_In_ int nCode, _In_ WPARAM wParam, _In_ LPARAM lParam)
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{
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if (nCode < 0 || ((wParam != WM_KEYDOWN) && (wParam != WM_SYSKEYDOWN)))
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{
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return CallNextHookEx(hHook, nCode, wParam, lParam);
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}
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const auto& keyPressInfo = *reinterpret_cast<KBDLLHOOKSTRUCT*>(lParam);
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Hotkey hotkey{
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.win = (GetAsyncKeyState(VK_LWIN) & 0x8000) || (GetAsyncKeyState(VK_RWIN) & 0x8000),
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.ctrl = static_cast<bool>(GetAsyncKeyState(VK_CONTROL) & 0x8000),
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.shift = static_cast<bool>(GetAsyncKeyState(VK_SHIFT) & 0x8000),
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.alt = static_cast<bool>(GetAsyncKeyState(VK_MENU) & 0x8000),
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.key = static_cast<unsigned char>(keyPressInfo.vkCode)
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};
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std::function<bool()> action;
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{
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// Hold the lock for the shortest possible duration
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std::unique_lock lock{ mutex };
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HotkeyDescriptor dummy{ .hotkey = hotkey };
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auto it = hotkeyDescriptors.find(dummy);
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if (it != hotkeyDescriptors.end())
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{
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action = it->action;
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}
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}
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if (action)
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{
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if (action())
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{
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// After invoking the hotkey send a dummy key to prevent Start Menu from activating
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INPUT dummyEvent[1] = {};
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dummyEvent[0].type = INPUT_KEYBOARD;
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dummyEvent[0].ki.wVk = 0xFF;
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dummyEvent[0].ki.dwFlags = KEYEVENTF_KEYUP;
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SendInput(1, dummyEvent, sizeof(INPUT));
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// Swallow the key press
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return 1;
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}
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}
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return CallNextHookEx(hHook, nCode, wParam, lParam);
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}
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void SetHotkeyAction(const std::wstring& moduleName, const Hotkey& hotkey, std::function<bool()>&& action) noexcept
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{
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std::unique_lock lock{ mutex };
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hotkeyDescriptors.insert({ .hotkey = hotkey, .moduleName = moduleName, .action = std::move(action) });
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}
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void ClearModuleHotkeys(const std::wstring& moduleName) noexcept
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{
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std::unique_lock lock{ mutex };
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auto it = hotkeyDescriptors.begin();
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while (it != hotkeyDescriptors.end())
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{
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if (it->moduleName == moduleName)
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{
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it = hotkeyDescriptors.erase(it);
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}
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else
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{
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++it;
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}
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}
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}
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void Start() noexcept
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{
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#if defined(DISABLE_LOWLEVEL_HOOKS_WHEN_DEBUGGED)
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const bool hook_disabled = IsDebuggerPresent();
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#else
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const bool hook_disabled = false;
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#endif
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if (!hook_disabled)
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{
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if (!hHook)
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{
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hHook = SetWindowsHookExW(WH_KEYBOARD_LL, KeyboardHookProc, NULL, NULL);
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if (!hHook)
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{
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DWORD errorCode = GetLastError();
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show_last_error_message(L"SetWindowsHookEx", errorCode, L"centralized_kb_hook");
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}
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}
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}
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}
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void Stop() noexcept
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{
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if (hHook && UnhookWindowsHookEx(hHook))
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{
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hHook = NULL;
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}
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}
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}
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