poppad2.c

Programming Windows 程序开发设计指南

/*-----------------------------------------------------
   POPPAD2.C -- Popup Editor Version 2 (includes menu)
                (c) Charles Petzold, 1996
  -----------------------------------------------------*/

#include <windows.h>
#include "poppad2.h"

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

char szAppName[] = "PopPad2" ;

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

     wndclass.cbSize        = sizeof (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 ;
     wndclass.hIconSm       = LoadIcon (NULL, IDI_APPLICATION) ;

     RegisterClassEx (&wndclass) ;

     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, "Really want to close PopPad2?",
                        szAppName, MB_YESNO | MB_ICONQUESTION) ;
     }

LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
     {
     static HWND hwndEdit ;
     int         iSelect, iEnable ;

     switch (iMsg)
          {
          case WM_CREATE :
               hwndEdit = CreateWindow ("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) 1,
                         ((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_UNDO,
                         SendMessage (hwndEdit, EM_CANUNDO, 0, 0) ?
                              MF_ENABLED : MF_GRAYED) ;

                    EnableMenuItem ((HMENU) wParam, IDM_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_CUT,   iEnable) ;
                    EnableMenuItem ((HMENU) wParam, IDM_COPY,  iEnable) ;
                    EnableMenuItem ((HMENU) wParam, IDM_DEL,   iEnable) ;

                    return 0 ;
                    }
               break ;

          case WM_COMMAND :

               if (lParam)
                    {
                    if (LOWORD (lParam) == 1 &&
                         (HIWORD (wParam) == EN_ERRSPACE ||
                          HIWORD (wParam) == EN_MAXTEXT))
                              MessageBox (hwnd, "Edit control out of space.",
                                          szAppName, MB_OK | MB_ICONSTOP) ;
                    return 0 ;
                    }

               else switch (LOWORD (wParam))
                         {
                         case IDM_NEW :
                         case IDM_OPEN :
                         case IDM_SAVE :
                         case IDM_SAVEAS :
                         case IDM_PRINT :
                              MessageBeep (0) ;
                              return 0 ;

                         case IDM_EXIT :
                              SendMessage (hwnd, WM_CLOSE, 0, 0) ;
                              return 0 ;

                         case IDM_UNDO :
                              SendMessage (hwndEdit, WM_UNDO, 0, 0) ;
                              return 0 ;

                         case IDM_CUT :
                              SendMessage (hwndEdit, WM_CUT, 0, 0) ;
                              return 0 ;

                         case IDM_COPY :
                              SendMessage (hwndEdit, WM_COPY, 0, 0) ;
                              return 0 ;

                         case IDM_PASTE :
                              SendMessage (hwndEdit, WM_PASTE, 0, 0) ;
                              return 0 ;

                         case IDM_DEL :
                              SendMessage (hwndEdit, WM_CLEAR, 0, 0) ;
                              return 0 ;

                         case IDM_SELALL :
                              SendMessage (hwndEdit, EM_SETSEL, 0, -1) ;
                              return 0 ;

                         case IDM_HELP :
                              MessageBox (hwnd, "Help not yet implemented!",
                                   szAppName, MB_OK | MB_ICONEXCLAMATION) ;
                              return 0 ;

                         case IDM_ABOUT :
                              MessageBox (hwnd,
                                   "POPPAD2 (c) Charles Petzold, 1996",
                                   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, iMsg, wParam, lParam) ;
     }