grafmenu.c

Programming Windows 程序开发设计指南

/*----------------------------------------------
   GRAFMENU.C -- Demonstrates Bitmap Menu Items
                 (c) Charles Petzold, 1996
  ----------------------------------------------*/

#include <windows.h>
#include <string.h>
#include "grafmenu.h"

LRESULT CALLBACK WndProc  (HWND, UINT, WPARAM, LPARAM) ;
HBITMAP StretchBitmap (HBITMAP) ;
HBITMAP GetBitmapFont (int) ;

char szAppName[] = "GrafMenu" ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
     {
     HBITMAP    hBitmapHelp, hBitmapFile, hBitmapEdit,
                hBitmapFont, hBitmapPopFont[3] ;
     HMENU      hMenu, hMenuPopup ;
     HWND       hwnd ;
     int        i ;
     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 (NULL, IDI_APPLICATION) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName  = NULL ;
     wndclass.lpszClassName = szAppName ;
     wndclass.hIconSm       = LoadIcon (NULL, IDI_APPLICATION) ;

     RegisterClassEx (&wndclass) ;

     hMenu = CreateMenu () ;

     hMenuPopup = LoadMenu (hInstance, "MenuFile") ;
     hBitmapFile = StretchBitmap (LoadBitmap (hInstance, "BitmapFile")) ;
     AppendMenu (hMenu, MF_BITMAP | MF_POPUP, (int) hMenuPopup,
                 (PSTR) (LONG) hBitmapFile) ;

     hMenuPopup = LoadMenu (hInstance, "MenuEdit") ;
     hBitmapEdit = StretchBitmap (LoadBitmap (hInstance, "BitmapEdit")) ;
     AppendMenu (hMenu, MF_BITMAP | MF_POPUP, (int) hMenuPopup,
                 (PSTR) (LONG) hBitmapEdit) ;

     hMenuPopup = CreateMenu () ;

     for (i = 0 ; i < 3 ; i++)
          {
          hBitmapPopFont[i] = GetBitmapFont (i) ;
          AppendMenu (hMenuPopup, MF_BITMAP, IDM_COUR + i,
                      (PSTR) (LONG) hBitmapPopFont[i]) ;
          }

     hBitmapFont = StretchBitmap (LoadBitmap (hInstance, "BitmapFont")) ;
     AppendMenu (hMenu, MF_BITMAP | MF_POPUP, (int) hMenuPopup,
                 (PSTR) (LONG) hBitmapFont) ;

     hwnd = CreateWindow (szAppName, "Bitmap Menu Demonstration",
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, hMenu, hInstance, NULL) ;

     hMenu = GetSystemMenu (hwnd, FALSE);
     hBitmapHelp = StretchBitmap (LoadBitmap (hInstance, "BitmapHelp")) ;
     AppendMenu (hMenu, MF_SEPARATOR, NULL,     NULL) ;
     AppendMenu (hMenu, MF_BITMAP,    IDM_HELP, (PSTR) (LONG) hBitmapHelp) ;

     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;

     while (GetMessage (&msg, NULL, 0, 0))
          {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
          }

     DeleteObject (hBitmapHelp) ;
     DeleteObject (hBitmapEdit) ;
     DeleteObject (hBitmapFile) ;
     DeleteObject (hBitmapFont) ;

     for (i = 0 ; i < 3 ; i++)
          DeleteObject (hBitmapPopFont[i]) ;

     return msg.wParam ;
     }

HBITMAP StretchBitmap (HBITMAP hBitmap1)
     {
     BITMAP     bm1, bm2 ;
     HBITMAP    hBitmap2 ;
     HDC        hdc, hdcMem1, hdcMem2 ;
     TEXTMETRIC tm ;

     hdc = CreateIC ("DISPLAY", NULL, NULL, NULL) ;
     GetTextMetrics (hdc, &tm) ;
     hdcMem1 = CreateCompatibleDC (hdc) ;
     hdcMem2 = CreateCompatibleDC (hdc) ;
     DeleteDC (hdc) ;

     GetObject (hBitmap1, sizeof (BITMAP), (PSTR) &bm1) ;

     bm2 = bm1 ;
     bm2.bmWidth      = (tm.tmAveCharWidth * bm2.bmWidth)  / 4 ;
     bm2.bmHeight     = (tm.tmHeight       * bm2.bmHeight) / 8 ;
     bm2.bmWidthBytes = ((bm2.bmWidth + 15) / 16) * 2 ;

     hBitmap2 = CreateBitmapIndirect (&bm2) ;

     SelectObject (hdcMem1, hBitmap1) ;
     SelectObject (hdcMem2, hBitmap2) ;

     StretchBlt (hdcMem2, 0, 0, bm2.bmWidth, bm2.bmHeight,
                 hdcMem1, 0, 0, bm1.bmWidth, bm1.bmHeight, SRCCOPY) ;

     DeleteDC (hdcMem1) ;
     DeleteDC (hdcMem2) ;
     DeleteObject (hBitmap1) ;

     return hBitmap2 ;
     }

HBITMAP GetBitmapFont (int i)
     {
     static char   *szFaceName[3] = { "Courier New", "Arial",
                                      "Times New Roman" } ;
     static LOGFONT lf ;
     HBITMAP        hBitmap ;
     HDC            hdc, hdcMem ;
     HFONT          hFont ;
     SIZE           size ;
     TEXTMETRIC     tm ;

     hdc = CreateIC ("DISPLAY", NULL, NULL, NULL) ;
     GetTextMetrics (hdc, &tm) ;

     lf.lfHeight = 2 * tm.tmHeight ;
     strcpy ((char *) lf.lfFaceName, szFaceName[i]) ;

     hdcMem = CreateCompatibleDC (hdc) ;
     hFont = (HFONT) SelectObject (hdcMem, CreateFontIndirect (&lf)) ;
     GetTextExtentPoint (hdcMem, szFaceName[i], strlen (szFaceName[i]), &size) ;

     hBitmap = CreateBitmap (size.cx, size.cy, 1, 1, NULL) ;
     SelectObject (hdcMem, hBitmap) ;

     TextOut (hdcMem, 0, 0, szFaceName[i], strlen (szFaceName[i])) ;

     DeleteObject (SelectObject (hdcMem, hFont)) ;
     DeleteDC (hdcMem) ;
     DeleteDC (hdc) ;

     return hBitmap ;
     }

LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
     {
     HMENU      hMenu ;
     static int iCurrentFont = IDM_COUR ;

     switch (iMsg)
          {
          case WM_CREATE :
               CheckMenuItem (GetMenu (hwnd), iCurrentFont, MF_CHECKED) ;
               return 0 ;

          case WM_SYSCOMMAND :
               switch (LOWORD (wParam))
                    {
                    case IDM_HELP :
                         MessageBox (hwnd, "Help not yet implemented!",
                                     szAppName, MB_OK | MB_ICONEXCLAMATION) ;
                         return 0 ;
                    }
               break ;

          case WM_COMMAND :
               switch (LOWORD (wParam))
                    {
                    case IDM_NEW :
                    case IDM_OPEN :
                    case IDM_SAVE :
                    case IDM_SAVEAS :
                    case IDM_UNDO :
                    case IDM_CUT :
                    case IDM_COPY :
                    case IDM_PASTE :
                    case IDM_DEL :
                         MessageBeep (0) ;
                         return 0 ;

                    case IDM_COUR :
                    case IDM_ARIAL :
                    case IDM_TIMES :
                         hMenu = GetMenu (hwnd) ;
                         CheckMenuItem (hMenu, iCurrentFont, MF_UNCHECKED) ;
                         iCurrentFont = LOWORD (wParam) ;
                         CheckMenuItem (hMenu, iCurrentFont, MF_CHECKED) ;
                         return 0 ;
                    }
               break ;

          case WM_DESTROY :
               PostQuitMessage (0) ;
               return 0 ;
          }
     return DefWindowProc (hwnd, iMsg, wParam, lParam) ;
     }