newbie modal question

[FOOTOO]

Is there a way to make a window modal, or is that only for dialog boxes?

Thanks in advance

[Dante Shamest]

Yes, by disabling the owner window using EnableWindow. Then when your modal window is destroyed, you re-enable your owner window and give it the focus. Enabling and disabling windows is accomplished with the EnableWindow function.

Here's a quick example. You click on the owner window's client area to lauch the modal window.

#include <windows.h>

LRESULT CALLBACK Owner_WndProc( HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam )
{
  static HWND hwndModal;
  
  switch(msg)  
  {
    case WM_CREATE:
      return 0;
      
    case WM_LBUTTONDOWN:
      hwndModal = CreateWindow( "DialogWnd", 
                                "Modal Window",
                                WS_POPUPWINDOW|WS_CAPTION|WS_VISIBLE,
                                (GetSystemMetrics( SM_CXSCREEN )-200)/2, 
                                (GetSystemMetrics( SM_CYSCREEN )-100)/2, 
                                200, 100,
                                hwnd, 0, GetModuleHandle(0), 0 );
      return 0;                                

    case WM_DESTROY:
      PostQuitMessage( 0 );
      return 0;

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

LRESULT CALLBACK Modal_WndProc( HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam ) 
{
  static HWND hwndOwner;
  
  switch( msg )
  {
    case WM_CREATE:
       hwndOwner = GetWindow(hwnd,GW_OWNER);
       EnableWindow( hwndOwner, FALSE );
       return 0;

    case WM_DESTROY:
       EnableWindow( hwndOwner, TRUE );
       SetFocus( hwndOwner );
       return 0;
       
    default:
       return DefWindowProc( hwnd, msg, wParam, lParam );
  } 
}

int WINAPI WinMain( HINSTANCE hInst, HINSTANCE hPrev, LPSTR args, int nShow )
{
  WNDCLASS wc = {0};
  
  // Register the owner window class.
  wc.lpszClassName = TEXT( "OwnerWnd" );
  wc.hInstance     = hInst ;
  wc.hbrBackground = GetSysColorBrush(COLOR_3DFACE);
  wc.lpfnWndProc   = Owner_WndProc ;
  wc.hCursor       = LoadCursor(0,IDC_ARROW);
  RegisterClass(&wc);
  
  // Register the modal dialog window's class.
  wc.lpszClassName = TEXT( "DialogWnd" );
  wc.lpfnWndProc   = Modal_WndProc ; 
  RegisterClass(&wc);
  
  // Create the owner window.
  CreateWindow("OwnerWnd",TEXT("Owner Window"),
               WS_OVERLAPPEDWINDOW|WS_VISIBLE,
               (GetSystemMetrics( SM_CXSCREEN )-400)/2,
               (GetSystemMetrics( SM_CYSCREEN )-300)/2,
               400,300, 0,0, hInst, 0);
  
  MSG  msg ;  
  while( GetMessage(&msg,0,0,0) > 0 ) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return (int)msg.wParam;
}

[FOOTOO]

Thank you