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/////////////////////////////////////////////////////////////////////////////
// Procedura dialogu

INT_PTR CALLBACK DialogProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
  LPMEASUREITEMSTRUCT lpMIS;
  switch ( uMsg )
  {
    case WM_COMMAND:
      switch ( LOWORD(wParam) )
      {
        case IDOK:
          EndDialog(hWnd, IDOK);
          break;
        case IDCANCEL:
          EndDialog(hWnd, IDCANCEL);
          break;
        case IDC_PRIDAT:
          PridatSoubor(hWnd);
          break;
      }
      break;
    case WM_INITDIALOG:
      break;
    case WM_DRAWITEM:
      DrawItem((LPDRAWITEMSTRUCT)lParam);
      break;
    case WM_MEASUREITEM:
      lpMIS = (LPMEASUREITEMSTRUCT)lParam;
      lpMIS->itemHeight = GetSystemMetrics(SM_CYICON) + 4;
      break;
  }
  return FALSE;
}

void PridatSoubor(HWND hWnd)
{
  TCHAR szSoubor[MAX_PATH];
  lstrcpy(szSoubor, _T(""));
  OPENFILENAME ofn;
  ZeroMemory(&ofn, sizeof(OPENFILENAME));
  ofn.lStructSize = sizeof(OPENFILENAME);
  ofn.hwndOwner = hWnd;
  ofn.lpstrFile = szSoubor;
  ofn.nMaxFile = sizeof(szSoubor);
  ofn.lpstrFilter = TEXT("Všechny soubory\0*.*\0");
  ofn.lpstrFileTitle = NULL;
  ofn.nMaxFileTitle = 0;
  ofn.lpstrInitialDir = NULL;
  ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
  if ( !GetOpenFileName(&ofn) ) 
    return;
  SendDlgItemMessage(hWnd, IDC_LISTBOX, LB_ADDSTRING, 0,
    (LPARAM)szSoubor);
}

void DrawItem(LPDRAWITEMSTRUCT lpDIS)
{
  TCHAR szSoubor[MAX_PATH];
  HBRUSH hbPozadi;
  SendMessage(lpDIS->hwndItem, LB_GETTEXT, lpDIS->itemID, (LPARAM)szSoubor);
    WORD index = 0;
  HICON hIcon = ExtractAssociatedIcon(g_hInstance, szSoubor, &index);
  if ( lpDIS->itemState & ODS_SELECTED )
  {
    hbPozadi = GetSysColorBrush(COLOR_HIGHLIGHT);
    SetTextColor(lpDIS->hDC, GetSysColor(COLOR_HIGHLIGHTTEXT));
  }
  else
  {
    hbPozadi = GetSysColorBrush(COLOR_WINDOW);
    SetTextColor(lpDIS->hDC, GetSysColor(COLOR_WINDOWTEXT));
  }
  
  SetBkMode(lpDIS->hDC, TRANSPARENT);
  FillRect(lpDIS->hDC, &lpDIS->rcItem, hbPozadi);
  
  DrawIcon(lpDIS->hDC, lpDIS->rcItem.left + 1,
    lpDIS->rcItem.top + 2, hIcon);
  RECT rect;
  CopyMemory(&rect, &lpDIS->rcItem, sizeof(RECT));
  rect.left += 34;
  DrawText(lpDIS->hDC, szSoubor, -1, &rect,
    DT_WORDBREAK | DT_VCENTER);
}