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, WORD hinstance, CLASS **ptr )
37 /* First search task-specific classes */
39 if ((atom = /*FindAtom*/GlobalFindAtom( 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) &&
46 (( hinstance==0xffff )|| (hinstance == classPtr->wc.hInstance)))
48 if (ptr) *ptr = classPtr;
54 /* Then search global classes */
56 if ((atom = GlobalFindAtom( name )) != 0)
58 for (class = firstClass; (class); class = classPtr->hNext)
60 classPtr = (CLASS *) USER_HEAP_ADDR(class);
61 if (!(classPtr->wc.style & CS_GLOBALCLASS)) continue;
62 if (classPtr->atomName == atom)
64 if (ptr) *ptr = classPtr;
74 /***********************************************************************
77 * Return a pointer to the CLASS structure corresponding to a HCLASS.
79 CLASS * CLASS_FindClassPtr( HCLASS hclass )
83 if (!hclass) return NULL;
84 ptr = (CLASS *) USER_HEAP_ADDR( hclass );
85 if (ptr->wMagic != CLASS_MAGIC) return NULL;
90 /***********************************************************************
91 * RegisterClass (USER.57)
93 ATOM RegisterClass( LPWNDCLASS class )
95 CLASS * newClass, * prevClassPtr;
96 HCLASS handle, prevClass;
99 dprintf_class(stddeb, "RegisterClass: wndproc=%p hinst=%d name='%s' background %x\n",
100 class->lpfnWndProc, class->hInstance, class->lpszClassName,
101 class->hbrBackground );
103 /* Check if a class with this name already exists */
105 prevClass = CLASS_FindClassByName( class->lpszClassName, class->hInstance,
109 /* Class can be created only if it is local and */
110 /* if the class with the same name is global. */
112 if (class->style & CS_GLOBALCLASS) return 0;
113 if (!(prevClassPtr->wc.style & CS_GLOBALCLASS)) return 0;
118 classExtra = (class->cbClsExtra < 0) ? 0 : class->cbClsExtra;
119 handle = USER_HEAP_ALLOC( GMEM_MOVEABLE, sizeof(CLASS) + classExtra );
120 if (!handle) return 0;
121 newClass = (CLASS *) USER_HEAP_ADDR( handle );
122 newClass->hNext = firstClass;
123 newClass->wMagic = CLASS_MAGIC;
124 newClass->cWindows = 0;
125 newClass->wc = *class;
126 newClass->wc.cbWndExtra = (class->cbWndExtra < 0) ? 0 : class->cbWndExtra;
127 newClass->wc.cbClsExtra = classExtra;
129 /*if (newClass->wc.style & CS_GLOBALCLASS)*/
130 newClass->atomName = GlobalAddAtom( class->lpszClassName );
131 /*else newClass->atomName = AddAtom( class->lpszClassName );*/
132 newClass->wc.lpszClassName = NULL;
134 if (newClass->wc.style & CS_CLASSDC)
135 newClass->hdce = DCE_AllocDCE( DCE_CLASS_DC );
136 else newClass->hdce = 0;
138 /* Make a copy of the menu name (only if it is a string) */
140 if ((int)class->lpszMenuName & 0xffff0000)
143 hname = USER_HEAP_ALLOC( GMEM_MOVEABLE, strlen(class->lpszMenuName)+1);
146 newClass->wc.lpszMenuName = (char *)USER_HEAP_ADDR( hname );
147 strcpy( newClass->wc.lpszMenuName, class->lpszMenuName );
151 if (classExtra) memset( newClass->wExtra, 0, classExtra );
153 return newClass->atomName;
157 /***********************************************************************
158 * UnregisterClass (USER.403)
160 BOOL UnregisterClass( LPSTR className, HANDLE instance )
162 HANDLE class, prevClass;
163 CLASS * classPtr, * prevClassPtr;
165 /* Check if we can remove this class */
166 class = CLASS_FindClassByName( className, instance, &classPtr );
167 if (!class) return FALSE;
168 if ((classPtr->wc.hInstance != instance) || (classPtr->cWindows > 0))
171 /* Remove the class from the linked list */
172 if (firstClass == class) firstClass = classPtr->hNext;
175 for (prevClass = firstClass; prevClass; prevClass=prevClassPtr->hNext)
177 prevClassPtr = (CLASS *) USER_HEAP_ADDR(prevClass);
178 if (prevClassPtr->hNext == class) break;
182 fprintf(stderr, "ERROR: Class list corrupted\n" );
185 prevClassPtr->hNext = classPtr->hNext;
188 /* Delete the class */
189 if (classPtr->hdce) DCE_FreeDCE( classPtr->hdce );
190 if (classPtr->wc.hbrBackground) DeleteObject( classPtr->wc.hbrBackground );
191 /*if (classPtr->wc.style & CS_GLOBALCLASS)*/ GlobalDeleteAtom( classPtr->atomName );
192 /*else DeleteAtom( classPtr->atomName );*/
193 if ((int)classPtr->wc.lpszMenuName & 0xffff0000)
194 USER_HEAP_FREE( (int)classPtr->wc.lpszMenuName & 0xffff );
195 USER_HEAP_FREE( class );
200 /***********************************************************************
201 * GetClassWord (USER.129)
203 WORD GetClassWord( HWND hwnd, short offset )
205 return (WORD)GetClassLong( hwnd, offset );
209 /***********************************************************************
210 * SetClassWord (USER.130)
212 WORD SetClassWord( HWND hwnd, short offset, WORD newval )
216 WORD *ptr, retval = 0;
218 if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
219 if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
220 ptr = (WORD *)(((char *)classPtr->wExtra) + offset);
227 /***********************************************************************
228 * GetClassLong (USER.131)
230 LONG GetClassLong( HWND hwnd, short offset )
235 if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
236 if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
237 return *(LONG *)(((char *)classPtr->wExtra) + offset);
241 /***********************************************************************
242 * SetClassLong (USER.132)
244 LONG SetClassLong( HWND hwnd, short offset, LONG newval )
248 LONG *ptr, retval = 0;
250 if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
251 if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
252 ptr = (LONG *)(((char *)classPtr->wExtra) + offset);
259 /***********************************************************************
260 * GetClassName (USER.58)
262 int GetClassName(HWND hwnd, LPSTR lpClassName, short maxCount)
267 /* FIXME: We have the find the correct hInstance */
268 if (!(wndPtr = WIN_FindWndPtr(hwnd))) return 0;
269 if (!(classPtr = CLASS_FindClassPtr(wndPtr->hClass))) return 0;
271 return (GetAtomName(classPtr->atomName, lpClassName, maxCount));
275 /***********************************************************************
276 * GetClassInfo (USER.404)
278 BOOL GetClassInfo(HANDLE hInstance, LPSTR lpClassName,
279 LPWNDCLASS lpWndClass)
283 if (HIWORD(lpClassName))
285 dprintf_class(stddeb, "GetClassInfo hInstance=%04x lpClassName=%s\n",
286 hInstance, lpClassName);
289 dprintf_class(stddeb, "GetClassInfo hInstance=%04x lpClassName=#%d\n",
290 hInstance, (int)lpClassName);
293 /* if (!(CLASS_FindClassByName(lpClassName, &classPtr))) return FALSE; */
294 if (!(CLASS_FindClassByName(lpClassName, hInstance, &classPtr)))
296 if (!HIWORD(lpClassName))
299 sprintf(temp, "#%d", (int)lpClassName);
300 if (!(CLASS_FindClassByName(temp, hInstance, &classPtr))) return FALSE;
306 if (hInstance && (hInstance != classPtr->wc.hInstance)) return FALSE;
308 memcpy(lpWndClass, &(classPtr->wc), sizeof(WNDCLASS));