From bc4cef92d8efbf97a9215122abc2d7247c287f12 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= Date: Fri, 2 Sep 2022 20:16:04 +0200 Subject: Improve Window object. --- c/win.cpp | 228 -------------------------------------------------------------- 1 file changed, 228 deletions(-) delete mode 100644 c/win.cpp (limited to 'c/win.cpp') diff --git a/c/win.cpp b/c/win.cpp deleted file mode 100644 index 40d68e4..0000000 --- a/c/win.cpp +++ /dev/null @@ -1,228 +0,0 @@ -#include -#include -#include -#include -#include - -#include "main.h" -#include "util.h" -#include "win.h" - -std::wstring WideFromNarrow(const std::string_view src, const int cp) -{ - int cchNarrow = src.length()+1; - int cchWide = MultiByteToWideChar(cp, 0, src.data(), cchNarrow, nullptr, 0); - std::wstring dst(cchWide, 0); - if (!MultiByteToWideChar(cp, 0, src.data(), cchNarrow, dst.data(), cchWide)) - throw Win32Error(); - return dst; -} - -void WithNextWindow(void (*proc)(HWND)) -{ - /* WithNextWindow uses a CBT hook to call an arbitrary - * procedure just before the creation of the next window. The - * hook is removed as soon as HCBT_CREATEWND is received. - * Thus, proc is guaranteed to be executed only once. Note - * that static storage must be used, as SetWindowHookEx cannot - * accept a capturing lambda as the hook procedure. */ - - static thread_local auto procNext = proc; - static thread_local HHOOK hHook = Require(SetWindowsHookExW(WH_CBT, [](const int nCode, - const WPARAM wParam, const LPARAM lParam) -> LRESULT CALLBACK - { - if (nCode == HCBT_CREATEWND) { - Require(UnhookWindowsHookEx(hHook)); - procNext(reinterpret_cast(wParam)); - return 0; - } else - return CallNextHookEx(0, nCode, wParam, lParam); - }, nullptr, GetCurrentThreadId())); -} - -/* Display next created window in the center of given window. */ -static void CenterNextWindow(HWND hWnd) -{ - if (!hWnd) - return; - - /* CenterNextWindow employs a trick similar to that above. - * Note, however, that repositioning does not work unless it - * is delayed until the new window is activated. This - * complicates the code somewhat. */ - - static thread_local HWND hWndParent; - static thread_local HWND hWndNext; - static thread_local HHOOK hHook; - - hWndParent = hWnd; - hWndNext = nullptr; - hHook = Require(SetWindowsHookExW(WH_CBT, [](const int nCode, - const WPARAM wParam, const LPARAM lParam) noexcept -> LRESULT CALLBACK - { - if (!hWndNext && nCode == HCBT_CREATEWND) { - hWndNext = reinterpret_cast(wParam); - return 0; - } else if (nCode == HCBT_ACTIVATE - && reinterpret_cast(wParam) == hWndNext) { - Require(UnhookWindowsHookEx(hHook)); - - long lStyle = GetWindowLongW(hWndNext, GWL_STYLE); - if (!(lStyle & WS_POPUP)) return 0; - - RECT rcMain, rcMsg; - GetWindowRect(hWndParent, &rcMain); - GetWindowRect(hWndNext, &rcMsg); - SetWindowPos(hWndNext, nullptr, - rcMain.left+(rcMain.right-rcMain.left)/2-(rcMsg.right-rcMsg.left)/2, - rcMain.top+(rcMain.bottom-rcMain.top)/2-(rcMsg.bottom-rcMsg.top)/2, - -1, -1, - SWP_NOZORDER|SWP_NOSIZE|SWP_NOACTIVATE); - - return 0; - } else - return CallNextHookEx(0, nCode, wParam, lParam); - }, nullptr, GetCurrentThreadId())); -} - -int EBMessageBox(const std::wstring_view text, const std::wstring_view caption, const UINT uType) -{ - extern Window* g_window; - CenterNextWindow(g_window->hWnd); - return MessageBox(g_window->hWnd, text.data(), caption.data(), uType); -} - -void ShowException(const wchar_t* const fmt, const wchar_t* const title, const UINT uType) noexcept -{ - try { - std::rethrow_exception(std::current_exception()); - } catch (const WideException& e) { - std::wstring msg(wcslen(fmt)+wcslen(e.What()), 0); - Swprintf(msg, fmt, e.What()); - EBMessageBox(msg, title, uType); - } catch (const std::exception& e) { - std::wstring what = WideFromNarrow(e.what()); - std::wstring msg(wcslen(fmt)+what.length(), 0); - Swprintf(msg, fmt, what.c_str()); - EBMessageBox(msg, title, uType); - } catch (...) { - const wchar_t* what = L"an unknown error occurred"; - std::wstring msg(wcslen(fmt)+wcslen(what), 0); - Swprintf(msg, fmt, what); - EBMessageBox(msg, title, uType); - } -} - -int GetRelativeCursorPos(const HWND hWnd, POINT* const pt) noexcept -{ - RECT rc; - if (!GetClientRect(hWnd, &rc)) return 0; - SetLastError(ERROR_SUCCESS); - if (!MapWindowPoints(hWnd, nullptr, (POINT*)&rc, 2)) return 0; - - POINT ptMouse; - if (!GetCursorPos(&ptMouse)) return 0; - pt->x = ptMouse.x-rc.left; - pt->y = ptMouse.y-rc.top; - return 1; -} - -Win32Error::Win32Error(const DWORD code, const HMODULE hModule) noexcept - : code(code), hModule(hModule) {} - -Win32Error::~Win32Error() -{ - if (m_szMsg) - HeapFree(GetProcessHeap(), 0, m_szMsg); - if (m_wszMsg) - HeapFree(GetProcessHeap(), 0, m_wszMsg); -} - -const char* Win32Error::what() const noexcept -{ - if (!m_szMsg) - FormatMessageA( - FORMAT_MESSAGE_ALLOCATE_BUFFER - |FORMAT_MESSAGE_FROM_SYSTEM - |FORMAT_MESSAGE_FROM_HMODULE - |FORMAT_MESSAGE_IGNORE_INSERTS, - hModule, - code, - MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), - (char*)&m_szMsg, - 0, nullptr); - return m_szMsg? m_szMsg: "An unknown error occurred"; -} - -const wchar_t* Win32Error::What() const noexcept -{ - if (!m_wszMsg) - FormatMessageW( - FORMAT_MESSAGE_ALLOCATE_BUFFER - |FORMAT_MESSAGE_FROM_SYSTEM - |FORMAT_MESSAGE_FROM_HMODULE - |FORMAT_MESSAGE_IGNORE_INSERTS, - hModule, - code, - MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US), - (wchar_t*)&m_wszMsg, - 0, nullptr); - return m_wszMsg? m_wszMsg: L"An unknown error occurred"; -} - -InternetError::InternetError(DWORD codeSystem) -{ - if (codeSystem != ERROR_INTERNET_EXTENDED_ERROR) - throw Win32Error(codeSystem, GetModuleHandle(L"wininet.dll")); - - DWORD len, cch; - InternetGetLastResponseInfo(&code, nullptr, &len); - - cch = len+1; - m_szMsg = new char[cch]; - if (!InternetGetLastResponseInfoA(&code, m_szMsg, &cch)) - throw Win32Error(); - - cch = len+1; - m_wszMsg = new wchar_t[cch]; - if (!InternetGetLastResponseInfoW(&code, m_wszMsg, &len)) - throw Win32Error(); -} - -InternetError::~InternetError() -{ - delete m_szMsg; - delete m_wszMsg; -} - -const char* InternetError::what() const noexcept -{ - return m_szMsg; -} - -const wchar_t* InternetError::What() const noexcept -{ - return m_wszMsg; -} - -std::optional Library::Maybe(const wchar_t* const lib) noexcept -{ - HMODULE hModule = LoadLibraryW(lib); - if (!hModule) return {}; - return Library(hModule); -} - -Library::Library(const HMODULE hModule) noexcept - : m_hModule(hModule) {} - -Library::Library(const wchar_t* const lib) -{ - m_hModule = LoadLibraryW(lib); - if (!m_hModule) - throw Win32Error(); -} - -Library::~Library() -{ - FreeLibrary(m_hModule); -} -- cgit v1.2.3