RetroArch/deps/libui/win32/utilwin.cpp

/* 14 may 2015 */
#include "uipriv_windows.hpp"
#include "../../verbosity.h"

/* 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 and console end session 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().
 */

#define utilWindowClass L"libui_utilWindowClass"

HWND utilWindow;

static LRESULT CALLBACK utilWindowWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
   void (*qf)(void *);
   LRESULT lResult;

   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;
   }
   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)
   {
      RARCH_ERR("Cannot register class.\n");
		/* 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)
   {
      RARCH_ERR("Cannot create window.\n");
		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");
}