// 14 may 2015 #include "uipriv_windows.hpp" // The utility window is a special window that performs certain tasks internal to libui. // It is not a message-only window, and it is always hidden and disabled. // Its roles: // - It is the initial parent of all controls. When a control loses its parent, it also becomes that control's parent. // - It handles WM_QUERYENDSESSION requests. // - It handles WM_WININICHANGE and forwards the message to any child windows that request it. // - It handles executing functions queued to run by uiQueueMain(). // TODO explain why it isn't message-only #define utilWindowClass L"libui_utilWindowClass" HWND utilWindow; static LRESULT CALLBACK utilWindowWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { void (*qf)(void *); LRESULT lResult; UINT_PTR id; if (handleParentMessages(hwnd, uMsg, wParam, lParam, &lResult) != FALSE) return lResult; switch (uMsg) { case WM_QUERYENDSESSION: // TODO block handler if (shouldQuit()) { uiQuit(); return TRUE; } return FALSE; case WM_WININICHANGE: issueWM_WININICHANGE(wParam, lParam); return 0; case msgQueued: qf = (void (*)(void *)) wParam; (*qf)((void *) lParam); return 0; case WM_TIMER: id = (UINT_PTR)wParam; TimerHandler timer = timerHandlers[id]; if (!timer.f(timer.data)) { if (!KillTimer(utilWindow, id)) logLastError(L"KillTimer()"); timerHandlers.erase(id); } return 0; } return DefWindowProcW(hwnd, uMsg, wParam, lParam); } const char *initUtilWindow(HICON hDefaultIcon, HCURSOR hDefaultCursor) { WNDCLASSW wc; ZeroMemory(&wc, sizeof (WNDCLASSW)); wc.lpszClassName = utilWindowClass; wc.lpfnWndProc = utilWindowWndProc; wc.hInstance = hInstance; wc.hIcon = hDefaultIcon; wc.hCursor = hDefaultCursor; wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1); if (RegisterClass(&wc) == 0) // see init.cpp for an explanation of the =s return "=registering utility window class"; utilWindow = CreateWindowExW(0, utilWindowClass, L"libui utility window", WS_OVERLAPPEDWINDOW, 0, 0, 100, 100, NULL, NULL, hInstance, NULL); if (utilWindow == NULL) return "=creating utility window"; // and just to be safe EnableWindow(utilWindow, FALSE); return NULL; } void uninitUtilWindow(void) { if (DestroyWindow(utilWindow) == 0) logLastError(L"error destroying utility window"); if (UnregisterClass(utilWindowClass, hInstance) == 0) logLastError(L"error unregistering utility window class"); }