Activation for mouse and keyboard

[underline_bruce]

Hello...

I am with problems in the attached code to this menssagem. My intention is to create a class with option to drag and drop, I implemented this with WM_NCHITTEST.

I am trying to create a way to keep only one active window for time, and I'm not obtaining, I think that for bad use of the messagens WM_ACTIVATE, WM_NCACTIVATE, WM_ACTIVATEAPP, WM_MOUSEACTIVATE, WM_SETFOCUS and WM_KILLFOCUS.

I desire to activate the windows by input of the mouse and of the keyboard (a window for time).

I appreciate any aid...

[underline_bruce]

I made, I want only one opinion about code.

#include <windows.h>

#define CHILDCLASS   "CHILDCLASS"
#define INACTIVATE   0
#define ACTIVATE     1

LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK ChildWinProc(HWND, UINT, WPARAM, LPARAM);
BOOL InitChildControl();

char szClassName[ ] = "WindowsApp";

int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil)

{
   HWND hwnd;
   MSG messages;
   WNDCLASSEX wincl;

   wincl.hInstance = hThisInstance;
   wincl.lpszClassName = szClassName;
   wincl.lpfnWndProc = WindowProc;
   wincl.style = CS_DBLCLKS;
   wincl.cbSize = sizeof (WNDCLASSEX);

   wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
   wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
   wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
   wincl.lpszMenuName = NULL;
   wincl.cbClsExtra = 0;
   wincl.cbWndExtra = 0;
   wincl.hbrBackground = (HBRUSH)COLOR_BTNSHADOW;

   if(!RegisterClassEx(&wincl))
     return 0;

   if(!InitChildControl())
     return 0;

   hwnd = CreateWindowEx (
          0,
          szClassName,
          "Windows App",
          WS_OVERLAPPEDWINDOW,
          CW_USEDEFAULT,
          CW_USEDEFAULT,
          544,
          375,
          HWND_DESKTOP,
          NULL,
          hThisInstance,
          NULL
          );

   ShowWindow (hwnd, nFunsterStil);

   while(GetMessage(&messages, NULL, 0, 0))
   {
      if(!IsDialogMessage(hwnd,&messages))
      {
         TranslateMessage(&messages);
         DispatchMessage(&messages);
      }
   }

   return messages.wParam;
}

LRESULT CALLBACK ChildWinProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
   static RECT rc;
   long ActParamAnt;
   long ActParam = ActParamAnt = GetWindowLongPtr(hwnd, GWL_USERDATA);

   switch(message)
   {
      case WM_PAINT:
      {
         PAINTSTRUCT ps;

         GetClientRect(hwnd,&rc);

         if(BeginPaint(hwnd,&ps))
         {
            if(ActParam == ACTIVATE)
            {
               FillRect(ps.hdc,&rc,(HBRUSH)4);

               SetBkMode(ps.hdc,TRANSPARENT);
               DrawText(ps.hdc,"ACTIVE",6,&rc,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
            }
            else
            {
               FillRect(ps.hdc,&rc,(HBRUSH)13);

               SetBkMode(ps.hdc,TRANSPARENT);
               DrawText(ps.hdc,"INACTIVE",8,&rc,DT_SINGLELINE|DT_CENTER|DT_VCENTER);
            }

            EndPaint(hwnd,&ps);
         }
      }break;

      case WM_MOUSEACTIVATE:
      {
         if(LOWORD(lParam) == HTNOWHERE)
         {
            ActParam = INACTIVATE;
            SetFocus(hwnd);
            InvalidateRect(hwnd,NULL,TRUE);

            return MA_NOACTIVATE;
         }
         else
         {
            ActParam = ACTIVATE;
            SetFocus(hwnd);
            InvalidateRect(hwnd,NULL,TRUE);

            return MA_ACTIVATE;
         }
      }break;

      case WM_SETFOCUS:
      {
         ActParam = ACTIVATE;
         InvalidateRect(hwnd,NULL,TRUE);
      }break;

      case WM_KILLFOCUS:
      {
         ActParam = INACTIVATE;
         InvalidateRect(hwnd,NULL,TRUE);
      }break;

      case WM_NCLBUTTONDBLCLK:
      {
         return 0;
      }break;

      case WM_NCHITTEST:
      {
         return HTCAPTION;
      }break;

      default:
        return DefWindowProc(hwnd, message, wParam, lParam);
   }
   
   if(ActParamAnt != ActParam)SetWindowLongPtr(hwnd, GWL_USERDATA, ActParam);
     return 0;
}

BOOL InitChildControl()
{
   WNDCLASSEX Wnd;

   Wnd.cbSize = sizeof(WNDCLASSEX);
   Wnd.lpszClassName = CHILDCLASS;
   Wnd.lpfnWndProc = ChildWinProc;
   Wnd.hInstance = GetModuleHandle(NULL);
   Wnd.style = CS_HREDRAW|CS_VREDRAW;
   Wnd.hIcon = LoadIcon (NULL, IDI_APPLICATION);
   Wnd.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
   Wnd.hCursor = LoadCursor (NULL, IDC_ARROW);
   Wnd.lpszMenuName = NULL;
   Wnd.cbClsExtra = 0;
   Wnd.cbWndExtra = 0;
   Wnd.hbrBackground = (HBRUSH)COLOR_BTNSHADOW;

   if(!RegisterClassEx(&Wnd))
   {
      return FALSE;
   }

   return TRUE;
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
   static HWND Control[4];

   switch (message)
   {
      case WM_CREATE:
      {
         Control[0] = CreateWindow(CHILDCLASS,"",WS_CHILD|WS_VISIBLE|WS_TABSTOP,10,10,85,25,hwnd,NULL,GetModuleHandle(NULL),NULL);
         Control[1] = CreateWindow(CHILDCLASS,"",WS_CHILD|WS_VISIBLE|WS_TABSTOP,110,10,85,25,hwnd,NULL,GetModuleHandle(NULL),NULL);
         Control[2] = CreateWindow(CHILDCLASS,"",WS_CHILD|WS_VISIBLE|WS_TABSTOP,210,10,85,25,hwnd,NULL,GetModuleHandle(NULL),NULL);
         Control[3] = CreateWindow(CHILDCLASS,"",WS_CHILD|WS_VISIBLE|WS_TABSTOP,310,10,85,25,hwnd,NULL,GetModuleHandle(NULL),NULL);
      }break;

      case WM_DESTROY:
        PostQuitMessage (0);
        break;

      default:
        return DefWindowProc(hwnd, message, wParam, lParam);
   }

   return 0;
}

bye