poppad2.c

Windows Programming source code

/*-----------------------------------------------------
   POPPAD2.C -- Popup Editor Version 2 (includes menu)
                (c) Charles Petzold, 1998
  -----------------------------------------------------*/

#include <windows.h>
#include "resource.h"

#define ID_EDIT     1

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

TCHAR szAppName[] = TEXT ("PopPad2") ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     HACCEL   hAccel ;
     HWND     hwnd ;
     MSG      msg ;
     WNDCLASS wndclass ;

     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = WndProc ;
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         = LoadIcon (hInstance, szAppName) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName  = szAppName ;
     wndclass.lpszClassName = szAppName ;
     
     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"),
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName, szAppName,
                          WS_OVERLAPPEDWINDOW,
                          GetSystemMetrics (SM_CXSCREEN) / 4,
                          GetSystemMetrics (SM_CYSCREEN) / 4,
                          GetSystemMetrics (SM_CXSCREEN) / 2,
                          GetSystemMetrics (SM_CYSCREEN) / 2,
                          NULL, NULL, hInstance, NULL) ;
     
     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ; 
     
     hAccel = LoadAccelerators (hInstance, szAppName) ;
     
     while (GetMessage (&msg, NULL, 0, 0))
     {
          if (!TranslateAccelerator (hwnd, hAccel, &msg))
          {
               TranslateMessage (&msg) ;
               DispatchMessage (&msg) ;
          }
     }
     return msg.wParam ;
}

AskConfirmation (HWND hwnd)
{
     return MessageBox (hwnd, TEXT ("Really want to close PopPad2?"),
                        szAppName, MB_YESNO | MB_ICONQUESTION) ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     static HWND hwndEdit ;
     int         iSelect, iEnable ;
     
     switch (message)
     {
     case WM_CREATE:
          hwndEdit = CreateWindow (TEXT ("edit"), NULL,
                              WS_CHILD | WS_VISIBLE | WS_HSCROLL | WS_VSCROLL |
                              WS_BORDER | ES_LEFT | ES_MULTILINE |
                              ES_AUTOHSCROLL | ES_AUTOVSCROLL,
                              0, 0, 0, 0, hwnd, (HMENU) ID_EDIT,
                              ((LPCREATESTRUCT) lParam)->hInstance, NULL) ;
          return 0 ;
          
     case WM_SETFOCUS:
          SetFocus (hwndEdit) ;
          return 0 ;
          
     case WM_SIZE: 
          MoveWindow (hwndEdit, 0, 0, LOWORD (lParam), HIWORD (lParam), TRUE) ;
          return 0 ;
          
     case WM_INITMENUPOPUP:
          if (lParam == 1)
          {
               EnableMenuItem ((HMENU) wParam, IDM_EDIT_UNDO,
                    SendMessage (hwndEdit, EM_CANUNDO, 0, 0) ?
                                   MF_ENABLED : MF_GRAYED) ;
               
               EnableMenuItem ((HMENU) wParam, IDM_EDIT_PASTE,
                    IsClipboardFormatAvailable (CF_TEXT) ?
                                   MF_ENABLED : MF_GRAYED) ;
               
               iSelect = SendMessage (hwndEdit, EM_GETSEL, 0, 0) ;
               
               if (HIWORD (iSelect) == LOWORD (iSelect))
                    iEnable = MF_GRAYED ;
               else
                    iEnable = MF_ENABLED ;
               
               EnableMenuItem ((HMENU) wParam, IDM_EDIT_CUT,   iEnable) ;
               EnableMenuItem ((HMENU) wParam, IDM_EDIT_COPY,  iEnable) ;
               EnableMenuItem ((HMENU) wParam, IDM_EDIT_CLEAR, iEnable) ;
               return 0 ;
          }
          break ;
          
     case WM_COMMAND:
          if (lParam)
          {
               if (LOWORD (lParam) == ID_EDIT &&
                         (HIWORD (wParam) == EN_ERRSPACE ||
                          HIWORD (wParam) == EN_MAXTEXT))
                    MessageBox (hwnd, TEXT ("Edit control out of space."),
                                szAppName, MB_OK | MB_ICONSTOP) ;
               return 0 ;
          }
          else switch (LOWORD (wParam))
          {
          case IDM_FILE_NEW:
          case IDM_FILE_OPEN:
          case IDM_FILE_SAVE:
          case IDM_FILE_SAVE_AS:
          case IDM_FILE_PRINT:
               MessageBeep (0) ;
               return 0 ;
          
          case IDM_APP_EXIT:
               SendMessage (hwnd, WM_CLOSE, 0, 0) ;
               return 0 ;

          case IDM_EDIT_UNDO:
               SendMessage (hwndEdit, WM_UNDO, 0, 0) ;
               return 0 ;
          
          case IDM_EDIT_CUT:
               SendMessage (hwndEdit, WM_CUT, 0, 0) ;
               return 0 ;
          
          case IDM_EDIT_COPY:
               SendMessage (hwndEdit, WM_COPY, 0, 0) ;
               return 0 ;
          
          case IDM_EDIT_PASTE:
               SendMessage (hwndEdit, WM_PASTE, 0, 0) ;
               return 0 ;
          
          case IDM_EDIT_CLEAR:
               SendMessage (hwndEdit, WM_CLEAR, 0, 0) ;
               return 0 ;
          
          case IDM_EDIT_SELECT_ALL:
               SendMessage (hwndEdit, EM_SETSEL, 0, -1) ;
               return 0 ;
          
          case IDM_HELP_HELP:
               MessageBox (hwnd, TEXT ("Help not yet implemented!"),
                           szAppName, MB_OK | MB_ICONEXCLAMATION) ;
               return 0 ;
          
          case IDM_APP_ABOUT:
               MessageBox (hwnd, TEXT ("POPPAD2 (c) Charles Petzold, 1998"),
                           szAppName, MB_OK | MB_ICONINFORMATION) ;
               return 0 ;
          }
          break ;
          
     case WM_CLOSE:
          if (IDYES == AskConfirmation (hwnd))
               DestroyWindow (hwnd) ;
          return 0 ;
          
     case WM_QUERYENDSESSION:
          if (IDYES == AskConfirmation (hwnd))
               return 1 ;
          else
               return 0 ;
          
     case WM_DESTROY:
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}