windows/class.c

   1 /*
   2  * Window classes functions
   3  *
   4  * Copyright 1993 Alexandre Julliard
   5  */
   6
   7 #include <stdlib.h>
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include "class.h"
  11 #include "user.h"
  12 #include "win.h"
  13 #include "dce.h"
  14 #include "atom.h"
  15 #include "ldt.h"
  16 #include "toolhelp.h"
  17 #include "stddebug.h"
  18 /* #define DEBUG_CLASS */
  19 #include "debug.h"
  20
  21
  22 static HCLASS firstClass = 0;
  23
  24
  25 /***********************************************************************
  26  *           CLASS_FindClassByName
  27  *
  28  * Return a handle and a pointer to the class.
  29  * 'ptr' can be NULL if the pointer is not needed.
  30  */
  31 HCLASS CLASS_FindClassByName( SEGPTR name, WORD hinstance, CLASS **ptr )
  32 {
  33     ATOM atom;
  34     HCLASS class;
  35     CLASS * classPtr;
  36
  37     if (!(atom = GlobalFindAtom( name ))) return 0;
  38
  39       /* First search task-specific classes */
  40
  41     for (class = firstClass; (class); class = classPtr->hNext)
  42     {
  43         classPtr = (CLASS *) USER_HEAP_LIN_ADDR(class);
  44         if (classPtr->wc.style & CS_GLOBALCLASS) continue;
  45         if ((classPtr->atomName == atom) &&
  46             ((hinstance==0xffff )|| (hinstance == classPtr->wc.hInstance)))
  47         {
  48             if (ptr) *ptr = classPtr;
  49             return class;
  50         }
  51     }
  52
  53       /* Then search global classes */
  54
  55     for (class = firstClass; (class); class = classPtr->hNext)
  56     {
  57         classPtr = (CLASS *) USER_HEAP_LIN_ADDR(class);
  58         if (!(classPtr->wc.style & CS_GLOBALCLASS)) continue;
  59         if (classPtr->atomName == atom)
  60         {
  61             if (ptr) *ptr = classPtr;
  62             return class;
  63         }
  64     }
  65
  66     return 0;
  67 }
  68
  69
  70 /***********************************************************************
  71  *           CLASS_FindClassPtr
  72  *
  73  * Return a pointer to the CLASS structure corresponding to a HCLASS.
  74  */
  75 CLASS * CLASS_FindClassPtr( HCLASS hclass )
  76 {
  77     CLASS * ptr;
  78
  79     if (!hclass) return NULL;
  80     ptr = (CLASS *) USER_HEAP_LIN_ADDR( hclass );
  81     if (ptr->wMagic != CLASS_MAGIC) return NULL;
  82     return ptr;
  83 }
  84
  85
  86 /***********************************************************************
  87  *           RegisterClass    (USER.57)
  88  */
  89 ATOM RegisterClass( LPWNDCLASS class )
  90 {
  91     CLASS * newClass, * prevClassPtr;
  92     HCLASS handle, prevClass;
  93     int classExtra;
  94
  95     dprintf_class( stddeb, "RegisterClass: wndproc=%08lx hinst=%04x name='%s' background %04x\n",
  96                  (DWORD)class->lpfnWndProc, class->hInstance,
  97                  HIWORD(class->lpszClassName) ?
  98                   (char *)PTR_SEG_TO_LIN(class->lpszClassName) : "(int)",
  99                  class->hbrBackground );
 100     dprintf_class(stddeb,"               style=%04x clsExtra=%d winExtra=%d\n",
 101                   class->style, class->cbClsExtra, class->cbWndExtra );
 102
 103       /* Window classes are owned by modules, not instances */
 104     class->hInstance = GetExePtr( class->hInstance );
 105
 106       /* Check if a class with this name already exists */
 107     prevClass = CLASS_FindClassByName( class->lpszClassName,
 108                                        class->hInstance, &prevClassPtr );
 109     if (prevClass)
 110     {
 111           /* Class can be created only if it is local and */
 112           /* if the class with the same name is global.   */
 113
 114         if (class->style & CS_GLOBALCLASS) return 0;
 115         if (!(prevClassPtr->wc.style & CS_GLOBALCLASS)) return 0;
 116     }
 117
 118       /* Create class */
 119
 120     classExtra = (class->cbClsExtra < 0) ? 0 : class->cbClsExtra;
 121     handle = USER_HEAP_ALLOC( sizeof(CLASS) + classExtra );
 122     if (!handle) return 0;
 123     newClass = (CLASS *) USER_HEAP_LIN_ADDR( handle );
 124     newClass->hNext         = firstClass;
 125     newClass->wMagic        = CLASS_MAGIC;
 126     newClass->cWindows      = 0;
 127     newClass->wc            = *class;
 128     newClass->wc.cbWndExtra = (class->cbWndExtra < 0) ? 0 : class->cbWndExtra;
 129     newClass->wc.cbClsExtra = classExtra;
 130
 131     newClass->atomName = GlobalAddAtom( class->lpszClassName );
 132     newClass->wc.lpszClassName = 0;
 133
 134     if (newClass->wc.style & CS_CLASSDC)
 135         newClass->hdce = DCE_AllocDCE( DCE_CLASS_DC );
 136     else newClass->hdce = 0;
 137
 138       /* Make a copy of the menu name (only if it is a string) */
 139
 140     if (HIWORD(class->lpszMenuName))
 141     {
 142         char *menuname = PTR_SEG_TO_LIN( class->lpszMenuName );
 143         HANDLE hname = USER_HEAP_ALLOC( strlen(menuname)+1 );
 144         if (hname)
 145         {
 146             newClass->wc.lpszMenuName = USER_HEAP_SEG_ADDR( hname );
 147             strcpy( USER_HEAP_LIN_ADDR( hname ), menuname );
 148         }
 149     }
 150
 151     if (classExtra) memset( newClass->wExtra, 0, classExtra );
 152     firstClass = handle;
 153     return newClass->atomName;
 154 }
 155
 156
 157 /***********************************************************************
 158  *           UnregisterClass    (USER.403)
 159  */
 160 BOOL UnregisterClass( SEGPTR className, HANDLE hinstance )
 161 {
 162     HANDLE class, prevClass;
 163     CLASS * classPtr, * prevClassPtr;
 164
 165     hinstance = GetExePtr( hinstance );
 166       /* Check if we can remove this class */
 167     class = CLASS_FindClassByName( className, hinstance, &classPtr );
 168     if (!class) return FALSE;
 169     if ((classPtr->wc.hInstance != hinstance) || (classPtr->cWindows > 0))
 170         return FALSE;
 171
 172       /* Remove the class from the linked list */
 173     if (firstClass == class) firstClass = classPtr->hNext;
 174     else
 175     {
 176         for (prevClass = firstClass; prevClass; prevClass=prevClassPtr->hNext)
 177         {
 178             prevClassPtr = (CLASS *) USER_HEAP_LIN_ADDR(prevClass);
 179             if (prevClassPtr->hNext == class) break;
 180         }
 181         if (!prevClass)
 182         {
 183             fprintf(stderr, "ERROR: Class list corrupted\n" );
 184             return FALSE;
 185         }
 186         prevClassPtr->hNext = classPtr->hNext;
 187     }
 188
 189       /* Delete the class */
 190     if (classPtr->hdce) DCE_FreeDCE( classPtr->hdce );
 191     if (classPtr->wc.hbrBackground) DeleteObject( classPtr->wc.hbrBackground );
 192     GlobalDeleteAtom( classPtr->atomName );
 193     if (HIWORD(classPtr->wc.lpszMenuName))
 194         USER_HEAP_FREE( LOWORD(classPtr->wc.lpszMenuName) );
 195     USER_HEAP_FREE( class );
 196     return TRUE;
 197 }
 198
 199
 200 /***********************************************************************
 201  *           GetClassWord    (USER.129)
 202  */
 203 WORD GetClassWord( HWND hwnd, short offset )
 204 {
 205     return (WORD)GetClassLong( hwnd, offset );
 206 }
 207
 208
 209 /***********************************************************************
 210  *           SetClassWord    (USER.130)
 211  */
 212 WORD SetClassWord( HWND hwnd, short offset, WORD newval )
 213 {
 214     CLASS * classPtr;
 215     WND * wndPtr;
 216     WORD *ptr, retval = 0;
 217
 218     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
 219     if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
 220     ptr = (WORD *)(((char *)classPtr->wExtra) + offset);
 221     retval = *ptr;
 222     *ptr = newval;
 223     return retval;
 224 }
 225
 226
 227 /***********************************************************************
 228  *           GetClassLong    (USER.131)
 229  */
 230 LONG GetClassLong( HWND hwnd, short offset )
 231 {
 232     CLASS * classPtr;
 233     WND * wndPtr;
 234
 235     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
 236     if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
 237     return *(LONG *)(((char *)classPtr->wExtra) + offset);
 238 }
 239
 240
 241 /***********************************************************************
 242  *           SetClassLong    (USER.132)
 243  */
 244 LONG SetClassLong( HWND hwnd, short offset, LONG newval )
 245 {
 246     CLASS * classPtr;
 247     WND * wndPtr;
 248     LONG *ptr, retval = 0;
 249
 250     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
 251     if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
 252     ptr = (LONG *)(((char *)classPtr->wExtra) + offset);
 253     retval = *ptr;
 254     *ptr = newval;
 255     return retval;
 256 }
 257
 258
 259 /***********************************************************************
 260  *           GetClassName      (USER.58)
 261  */
 262 int GetClassName(HWND hwnd, LPSTR lpClassName, short maxCount)
 263 {
 264     WND *wndPtr;
 265     CLASS *classPtr;
 266
 267     /* FIXME: We have the find the correct hInstance */
 268     dprintf_class(stddeb,"GetClassName(%x,%p,%d)\n",hwnd,lpClassName,maxCount);
 269     if (!(wndPtr = WIN_FindWndPtr(hwnd))) return 0;
 270     if (!(classPtr = CLASS_FindClassPtr(wndPtr->hClass))) return 0;
 271
 272     return GlobalGetAtomName(classPtr->atomName, lpClassName, maxCount);
 273 }
 274
 275
 276 /***********************************************************************
 277  *           GetClassInfo      (USER.404)
 278  */
 279 BOOL GetClassInfo( HANDLE hInstance, SEGPTR name, LPWNDCLASS lpWndClass )
 280 {
 281     CLASS *classPtr;
 282
 283     dprintf_class( stddeb, "GetClassInfo: hInstance=%04x className=%s\n",
 284                    hInstance,
 285                    HIWORD(name) ? (char *)PTR_SEG_TO_LIN(name) : "(int)" );
 286
 287     hInstance = GetExePtr( hInstance );
 288
 289     if (!(CLASS_FindClassByName( name, hInstance, &classPtr))) return FALSE;
 290     if (hInstance && (hInstance != classPtr->wc.hInstance)) return FALSE;
 291
 292     memcpy(lpWndClass, &(classPtr->wc), sizeof(WNDCLASS));
 293     return TRUE;
 294 }
 295
 296
 297 /***********************************************************************
 298  *           ClassFirst      (TOOLHELP.69)
 299  */
 300 BOOL ClassFirst( CLASSENTRY *pClassEntry )
 301 {
 302     pClassEntry->wNext = firstClass;
 303     return ClassNext( pClassEntry );
 304 }
 305
 306
 307 /***********************************************************************
 308  *           ClassNext      (TOOLHELP.70)
 309  */
 310 BOOL ClassNext( CLASSENTRY *pClassEntry )
 311 {
 312     CLASS *classPtr = (CLASS *) USER_HEAP_LIN_ADDR( pClassEntry->wNext );
 313     if (!classPtr) return FALSE;
 314
 315     pClassEntry->hInst = classPtr->wc.hInstance;
 316     pClassEntry->wNext = classPtr->hNext;
 317     GlobalGetAtomName( classPtr->atomName, pClassEntry->szClassName,
 318                        sizeof(pClassEntry->szClassName) );
 319     return TRUE;
 320 }