2 * Window classes functions
4 * Copyright 1993 Alexandre Julliard
7 static char Copyright[] = "Copyright Alexandre Julliard, 1993";
17 /* #define DEBUG_CLASS */
18 /* #undef DEBUG_CLASS */
22 static HCLASS firstClass = 0;
25 /***********************************************************************
26 * CLASS_FindClassByName
28 * Return a handle and a pointer to the class.
29 * 'ptr' can be NULL if the pointer is not needed.
31 HCLASS CLASS_FindClassByName( char * name, CLASS **ptr )
37 /* First search task-specific classes */
39 if ((atom = FindAtom( name )) != 0)
41 for (class = firstClass; (class); class = classPtr->hNext)
43 classPtr = (CLASS *) USER_HEAP_ADDR(class);
44 if (classPtr->wc.style & CS_GLOBALCLASS) continue;
45 if (classPtr->atomName == atom)
47 if (ptr) *ptr = classPtr;
53 /* Then search global classes */
55 if ((atom = GlobalFindAtom( name )) != 0)
57 for (class = firstClass; (class); class = classPtr->hNext)
59 classPtr = (CLASS *) USER_HEAP_ADDR(class);
60 if (!(classPtr->wc.style & CS_GLOBALCLASS)) continue;
61 if (classPtr->atomName == atom)
63 if (ptr) *ptr = classPtr;
73 /***********************************************************************
76 * Return a pointer to the CLASS structure corresponding to a HCLASS.
78 CLASS * CLASS_FindClassPtr( HCLASS hclass )
82 if (!hclass) return NULL;
83 ptr = (CLASS *) USER_HEAP_ADDR( hclass );
84 if (ptr->wMagic != CLASS_MAGIC) return NULL;
89 /***********************************************************************
90 * RegisterClass (USER.57)
92 ATOM RegisterClass( LPWNDCLASS class )
94 CLASS * newClass, * prevClassPtr;
95 HCLASS handle, prevClass;
98 dprintf_class(stddeb, "RegisterClass: wndproc=%p hinst=%d name='%s' background %x\n",
99 class->lpfnWndProc, class->hInstance, class->lpszClassName,
100 class->hbrBackground );
102 /* Check if a class with this name already exists */
104 prevClass = CLASS_FindClassByName( class->lpszClassName, &prevClassPtr );
107 /* Class can be created only if it is local and */
108 /* if the class with the same name is global. */
110 if (class->style & CS_GLOBALCLASS) return 0;
111 if (!(prevClassPtr->wc.style & CS_GLOBALCLASS)) return 0;
116 classExtra = (class->cbClsExtra < 0) ? 0 : class->cbClsExtra;
117 handle = USER_HEAP_ALLOC( GMEM_MOVEABLE, sizeof(CLASS) + classExtra );
118 if (!handle) return 0;
119 newClass = (CLASS *) USER_HEAP_ADDR( handle );
120 newClass->hNext = firstClass;
121 newClass->wMagic = CLASS_MAGIC;
122 newClass->cWindows = 0;
123 newClass->wc = *class;
124 newClass->wc.cbWndExtra = (class->cbWndExtra < 0) ? 0 : class->cbWndExtra;
125 newClass->wc.cbClsExtra = classExtra;
127 if (newClass->wc.style & CS_GLOBALCLASS)
128 newClass->atomName = GlobalAddAtom( class->lpszClassName );
129 else newClass->atomName = AddAtom( class->lpszClassName );
130 newClass->wc.lpszClassName = NULL;
132 if (newClass->wc.style & CS_CLASSDC)
133 newClass->hdce = DCE_AllocDCE( DCE_CLASS_DC );
134 else newClass->hdce = 0;
136 /* Make a copy of the menu name (only if it is a string) */
138 if ((int)class->lpszMenuName & 0xffff0000)
141 hname = USER_HEAP_ALLOC( GMEM_MOVEABLE, strlen(class->lpszMenuName)+1);
144 newClass->wc.lpszMenuName = (char *)USER_HEAP_ADDR( hname );
145 strcpy( newClass->wc.lpszMenuName, class->lpszMenuName );
149 if (classExtra) memset( newClass->wExtra, 0, classExtra );
151 return newClass->atomName;
155 /***********************************************************************
156 * UnregisterClass (USER.403)
158 BOOL UnregisterClass( LPSTR className, HANDLE instance )
160 HANDLE class, prevClass;
161 CLASS * classPtr, * prevClassPtr;
163 /* Check if we can remove this class */
164 class = CLASS_FindClassByName( className, &classPtr );
165 if (!class) return FALSE;
166 if ((classPtr->wc.hInstance != instance) || (classPtr->cWindows > 0))
169 /* Remove the class from the linked list */
170 if (firstClass == class) firstClass = classPtr->hNext;
173 for (prevClass = firstClass; prevClass; prevClass=prevClassPtr->hNext)
175 prevClassPtr = (CLASS *) USER_HEAP_ADDR(prevClass);
176 if (prevClassPtr->hNext == class) break;
180 fprintf(stderr, "ERROR: Class list corrupted\n" );
183 prevClassPtr->hNext = classPtr->hNext;
186 /* Delete the class */
187 if (classPtr->hdce) DCE_FreeDCE( classPtr->hdce );
188 if (classPtr->wc.hbrBackground) DeleteObject( classPtr->wc.hbrBackground );
189 if (classPtr->wc.style & CS_GLOBALCLASS) GlobalDeleteAtom( classPtr->atomName );
190 else DeleteAtom( classPtr->atomName );
191 if ((int)classPtr->wc.lpszMenuName & 0xffff0000)
192 USER_HEAP_FREE( (int)classPtr->wc.lpszMenuName & 0xffff );
193 USER_HEAP_FREE( class );
198 /***********************************************************************
199 * GetClassWord (USER.129)
201 WORD GetClassWord( HWND hwnd, short offset )
203 return (WORD)GetClassLong( hwnd, offset );
207 /***********************************************************************
208 * SetClassWord (USER.130)
210 WORD SetClassWord( HWND hwnd, short offset, WORD newval )
214 WORD *ptr, retval = 0;
216 if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
217 if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
218 ptr = (WORD *)(((char *)classPtr->wExtra) + offset);
225 /***********************************************************************
226 * GetClassLong (USER.131)
228 LONG GetClassLong( HWND hwnd, short offset )
233 if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
234 if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
235 return *(LONG *)(((char *)classPtr->wExtra) + offset);
239 /***********************************************************************
240 * SetClassLong (USER.132)
242 LONG SetClassLong( HWND hwnd, short offset, LONG newval )
246 LONG *ptr, retval = 0;
248 if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
249 if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
250 ptr = (LONG *)(((char *)classPtr->wExtra) + offset);
257 /***********************************************************************
258 * GetClassName (USER.58)
260 int GetClassName(HWND hwnd, LPSTR lpClassName, short maxCount)
265 if (!(wndPtr = WIN_FindWndPtr(hwnd))) return 0;
266 if (!(classPtr = CLASS_FindClassPtr(wndPtr->hClass))) return 0;
268 return (GetAtomName(classPtr->atomName, lpClassName, maxCount));
272 /***********************************************************************
273 * GetClassInfo (USER.404)
275 BOOL GetClassInfo(HANDLE hInstance, LPSTR lpClassName,
276 LPWNDCLASS lpWndClass)
280 if (!(CLASS_FindClassByName(lpClassName, &classPtr))) return FALSE;
281 if (hInstance && (hInstance != classPtr->wc.hInstance)) return FALSE;
283 memcpy(lpWndClass, &(classPtr->wc), sizeof(WNDCLASS));