2 * Window classes functions
4 * Copyright 1993 Alexandre Julliard
7 static char Copyright[] = "Copyright Alexandre Julliard, 1993";
17 /* #define DEBUG_CLASS /* */
20 static HCLASS firstClass = 0;
23 /***********************************************************************
24 * CLASS_FindClassByName
26 * Return a handle and a pointer to the class.
27 * 'ptr' can be NULL if the pointer is not needed.
29 HCLASS CLASS_FindClassByName( char * name, CLASS **ptr )
35 /* First search task-specific classes */
37 if ((atom = FindAtom( name )) != 0)
39 for (class = firstClass; (class); class = classPtr->hNext)
41 classPtr = (CLASS *) USER_HEAP_ADDR(class);
42 if (classPtr->wc.style & CS_GLOBALCLASS) continue;
43 if (classPtr->atomName == atom)
45 if (ptr) *ptr = classPtr;
51 /* Then search global classes */
53 if ((atom = GlobalFindAtom( name )) != 0)
55 for (class = firstClass; (class); class = classPtr->hNext)
57 classPtr = (CLASS *) USER_HEAP_ADDR(class);
58 if (!(classPtr->wc.style & CS_GLOBALCLASS)) continue;
59 if (classPtr->atomName == atom)
61 if (ptr) *ptr = classPtr;
71 /***********************************************************************
74 * Return a pointer to the CLASS structure corresponding to a HCLASS.
76 CLASS * CLASS_FindClassPtr( HCLASS hclass )
80 if (!hclass) return NULL;
81 ptr = (CLASS *) USER_HEAP_ADDR( hclass );
82 if (ptr->wMagic != CLASS_MAGIC) return NULL;
87 /***********************************************************************
88 * RegisterClass (USER.57)
90 ATOM RegisterClass( LPWNDCLASS class )
92 CLASS * newClass, * prevClassPtr;
93 HCLASS handle, prevClass;
96 printf( "RegisterClass: wndproc=%08x hinst=%d name='%s' background %x\n",
97 class->lpfnWndProc, class->hInstance, class->lpszClassName,
98 class->hbrBackground );
101 /* Check if a class with this name already exists */
103 prevClass = CLASS_FindClassByName( class->lpszClassName, &prevClassPtr );
106 /* Class can be created only if it is local and */
107 /* if the class with the same name is global. */
109 if (class->style & CS_GLOBALCLASS) return 0;
110 if (!(prevClassPtr->wc.style & CS_GLOBALCLASS)) return 0;
113 /* bug for bug compatible */
115 if (class->cbClsExtra < 0) class->cbClsExtra = 0;
116 if (class->cbWndExtra < 0) class->cbWndExtra = 0;
120 handle = USER_HEAP_ALLOC( GMEM_MOVEABLE, sizeof(CLASS)+class->cbClsExtra );
121 if (!handle) return 0;
122 newClass = (CLASS *) USER_HEAP_ADDR( handle );
123 newClass->hNext = firstClass;
124 newClass->wMagic = CLASS_MAGIC;
125 newClass->cWindows = 0;
126 newClass->wc = *class;
128 if (newClass->wc.style & CS_GLOBALCLASS)
129 newClass->atomName = GlobalAddAtom( class->lpszClassName );
130 else newClass->atomName = AddAtom( class->lpszClassName );
131 newClass->wc.lpszClassName = NULL;
133 if (newClass->wc.style & CS_CLASSDC)
134 newClass->hdce = DCE_AllocDCE( DCE_CLASS_DC );
135 else newClass->hdce = 0;
137 /* Make a copy of the menu name (only if it is a string) */
139 if ((int)class->lpszMenuName & 0xffff0000)
142 hname = USER_HEAP_ALLOC( GMEM_MOVEABLE, strlen(class->lpszMenuName)+1);
145 newClass->wc.lpszMenuName = (char *)USER_HEAP_ADDR( hname );
146 strcpy( newClass->wc.lpszMenuName, class->lpszMenuName );
150 if (class->cbClsExtra) memset( newClass->wExtra, 0, class->cbClsExtra );
152 return newClass->atomName;
156 /***********************************************************************
157 * UnregisterClass (USER.403)
159 BOOL UnregisterClass( LPSTR className, HANDLE instance )
161 HANDLE class, prevClass;
162 CLASS * classPtr, * prevClassPtr;
164 /* Check if we can remove this class */
165 class = CLASS_FindClassByName( className, &classPtr );
166 if (!class) return FALSE;
167 if ((classPtr->wc.hInstance != instance) || (classPtr->cWindows > 0))
170 /* Remove the class from the linked list */
171 if (firstClass == class) firstClass = classPtr->hNext;
174 for (prevClass = firstClass; prevClass; prevClass=prevClassPtr->hNext)
176 prevClassPtr = (CLASS *) USER_HEAP_ADDR(prevClass);
177 if (prevClassPtr->hNext == class) break;
181 printf( "ERROR: Class list corrupted\n" );
184 prevClassPtr->hNext = classPtr->hNext;
187 /* Delete the class */
188 if (classPtr->hdce) DCE_FreeDCE( classPtr->hdce );
189 if (classPtr->wc.hbrBackground) DeleteObject( classPtr->wc.hbrBackground );
190 if (classPtr->wc.style & CS_GLOBALCLASS) GlobalDeleteAtom( classPtr->atomName );
191 else DeleteAtom( classPtr->atomName );
192 if ((int)classPtr->wc.lpszMenuName & 0xffff0000)
193 USER_HEAP_FREE( (int)classPtr->wc.lpszMenuName & 0xffff );
194 USER_HEAP_FREE( class );
199 /***********************************************************************
200 * GetClassWord (USER.129)
202 WORD GetClassWord( HWND hwnd, short offset )
204 return (WORD)GetClassLong( hwnd, offset );
208 /***********************************************************************
209 * SetClassWord (USER.130)
211 WORD SetClassWord( HWND hwnd, short offset, WORD newval )
215 WORD *ptr, retval = 0;
217 if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
218 if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
219 ptr = (WORD *)(((char *)classPtr->wExtra) + offset);
226 /***********************************************************************
227 * GetClassLong (USER.131)
229 LONG GetClassLong( HWND hwnd, short offset )
234 if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
235 if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
236 return *(LONG *)(((char *)classPtr->wExtra) + offset);
240 /***********************************************************************
241 * SetClassLong (USER.132)
243 LONG SetClassLong( HWND hwnd, short offset, LONG newval )
247 LONG *ptr, retval = 0;
249 if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
250 if (!(classPtr = CLASS_FindClassPtr( wndPtr->hClass ))) return 0;
251 ptr = (LONG *)(((char *)classPtr->wExtra) + offset);
258 /***********************************************************************
259 * GetClassName (USER.58)
261 int GetClassName(HWND hwnd, LPSTR lpClassName, short maxCount)
266 if (!(wndPtr = WIN_FindWndPtr(hwnd))) return 0;
267 if (!(classPtr = CLASS_FindClassPtr(wndPtr->hClass))) return 0;
269 return (GetAtomName(classPtr->atomName, lpClassName, maxCount));
273 /***********************************************************************
274 * GetClassInfo (USER.404)
276 BOOL GetClassInfo(HANDLE hInstance, LPSTR lpClassName,
277 LPWNDCLASS lpWndClass)
281 if (!(CLASS_FindClassByName(lpClassName, &classPtr))) return FALSE;
282 if (hInstance && (hInstance != classPtr->wc.hInstance)) return FALSE;
284 memcpy(lpWndClass, &(classPtr->wc), sizeof(WNDCLASS));