source: trunk/src/user32/win32wbase.h@ 6800

Last change on this file since 6800 was 6783, checked in by sandervl, 24 years ago

focus/activation fixes
File size: 20.6 KB
Line 
1/* $Id: win32wbase.h,v 1.126 2001-09-22 18:21:00 sandervl Exp $ */
2/*
3 * Win32 Window Base Class for OS/2
4 *
5 *
6 * Copyright 1998-1999 Sander van Leeuwen (sandervl@xs4all.nl)
7 * Copyright 1999 Daniela Engert (dani@ngrt.de)
8 *
9 *
10 * Project Odin Software License can be found in LICENSE.TXT
11 *
12 */
13#ifndef __WIN32WNDBASE_H__
14#define __WIN32WNDBASE_H__
15
16#ifdef __cplusplus
17
18#include <win32class.h>
19#include "open32wbase.h"
20#include <gen_object.h>
21#include <win32wndchild.h>
22#include <winres.h>
23#include <scroll.h>
24
25class Win32BaseWindow;
26
27#define OFFSET_RESERVED 0 //reserved for odin apps (such as Opera)
28#define OFFSET_WIN32WNDPTR 4
29#define OFFSET_WIN32PM_MAGIC 8
30#define OFFSET_WIN32FLAGS 12
31#define NROF_WIN32WNDBYTES 16
32
33#define WINDOWFLAG_ACTIVE 1
34
35#define WIN32PM_MAGIC 0x12345678
36#define CheckMagicDword(a) (a==WIN32PM_MAGIC)
37
38#ifdef DEBUG
39#define RELEASE_WNDOBJ(a) { a->release(__FUNCTION__, __LINE__); a = NULL; }
40#else
41#define RELEASE_WNDOBJ(a) { a->release(); a = NULL; }
42#endif
43
44typedef struct {
45 USHORT cb;
46 Win32BaseWindow *win32wnd;
47 ULONG win32CreateStruct; //or dialog create dword
48} CUSTOMWNDDATA;
49
50typedef struct tagPROPERTY
51{
52 struct tagPROPERTY *next; /* Next property in window list */
53 HANDLE handle; /* User's data */
54 LPSTR string; /* Property string (or atom) */
55} PROPERTY;
56
57//PostThreadMessage is done through Open32; which means the message id will be translated
58//(0xc00 added)
59#define OPEN32_MSGDIFF 0xC00
60#define WIN32APP_POSTMSG (0x1000+OPEN32_MSGDIFF)
61
62//PM doesn't allow SetFocus during WM_SETFOCUS message processing; must delay
63//this by posting a message
64//NOTE Must be smaller than WIN32APP_POSTMSG!
65#define WIN32APP_SETFOCUSMSG (WIN32APP_POSTMSG-1)
66
67#define WIN32MSG_MAGICA 0x12345678
68#define WIN32MSG_MAGICW 0x12345679
69
70typedef struct
71{
72 ULONG wParam;
73 ULONG lParam;
74} POSTMSG_PACKET;
75
76#define BROADCAST_SEND 0
77#define BROADCAST_POST 1
78
79#define HAS_DLGFRAME(style,exStyle) \
80 (((exStyle) & WS_EX_DLGMODALFRAME) || \
81 (((style) & WS_DLGFRAME) && !((style) & WS_THICKFRAME)))
82
83#define HAS_THICKFRAME(style,exStyle) \
84 (((style) & WS_THICKFRAME) && \
85 !(((style) & (WS_DLGFRAME|WS_BORDER)) == WS_DLGFRAME))
86#if 0
87 (((style) & WS_THICKFRAME) && \
88 !((exStyle) & WS_EX_DLGMODALFRAME) && \
89 !((style) & WS_CHILD))
90#endif
91
92#define HAS_THINFRAME(style) \
93 (((style) & WS_BORDER) || !((style) & (WS_CHILD | WS_POPUP)))
94
95#define HAS_BIGFRAME(style,exStyle) \
96 (((style) & (WS_THICKFRAME | WS_DLGFRAME)) || \
97 ((exStyle) & WS_EX_DLGMODALFRAME))
98
99#define HAS_ANYFRAME(style,exStyle) \
100 (((style) & (WS_THICKFRAME | WS_DLGFRAME | WS_BORDER)) || \
101 ((exStyle) & WS_EX_DLGMODALFRAME) || \
102 !((style) & (WS_CHILD | WS_POPUP)))
103
104#define HAS_3DFRAME(exStyle) \
105 ((exStyle & WS_EX_CLIENTEDGE) || (exStyle & WS_EX_STATICEDGE) || (exStyle & WS_EX_WINDOWEDGE))
106
107#define HAS_BORDER(style, exStyle) \
108 ((style & WS_BORDER) || HAS_THICKFRAME(style) || HAS_DLGFRAME(style,exStyle))
109
110#define IS_OVERLAPPED(style) \
111 !(style & (WS_CHILD | WS_POPUP))
112
113#define HAS_MENU() (!(getStyle() & WS_CHILD) && (GetMenu() != 0))
114
115#define STATE_INIT 0 //initial state
116#define STATE_PRE_WMNCCREATE 1 //before WM_NCCREATE
117#define STATE_POST_WMNCCREATE 2 //after WM_NCCREATE
118#define STATE_PRE_WMCREATE 3 //before WM_CREATE
119#define STATE_POST_WMCREATE 4 //after WM_CREATE
120#define STATE_CREATED 5 //after successful return of WinCreateWindow
121#define STATE_DESTROYED 6 //DestroyWindow called for window
122
123
124class Win32BaseWindow : public GenericObject, public ChildWindow
125{
126public:
127 Win32BaseWindow();
128 Win32BaseWindow(CREATESTRUCTA *lpCreateStructA, ATOM classAtom, BOOL isUnicode);
129 Win32BaseWindow(HWND hwndOS2, ULONG reserved);
130
131virtual ~Win32BaseWindow();
132
133virtual ULONG MsgCreate(HWND hwndOS2);
134 ULONG MsgQuit();
135 ULONG MsgClose();
136 ULONG MsgDestroy();
137virtual ULONG MsgEnable(BOOL fEnable);
138 ULONG MsgShow(BOOL fShow);
139 ULONG MsgPosChanging(LPARAM lp);
140 ULONG MsgPosChanged(LPARAM lp);
141 ULONG MsgActivate(BOOL fActivate, BOOL fMinimized, HWND hwnd, HWND hwndOS2Win);
142 ULONG MsgChildActivate(BOOL fActivate);
143 ULONG MsgSetFocus(HWND hwnd);
144 ULONG MsgKillFocus(HWND hwnd);
145 ULONG MsgScroll(ULONG msg, ULONG scrollCode, ULONG scrollPos);
146 ULONG MsgButton(MSG *msg);
147 ULONG MsgMouseMove(MSG *msg);
148 ULONG MsgChar(MSG *msg);
149 ULONG MsgPaint(ULONG tmp1, BOOL select = TRUE);
150 ULONG MsgEraseBackGround(HDC hdc);
151 ULONG MsgNCPaint(PRECT pUpdateRect);
152 ULONG MsgFormatFrame(WINDOWPOS *lpWndPos);
153 ULONG DispatchMsgA(MSG *msg);
154 ULONG DispatchMsgW(MSG *msg);
155
156 ULONG MsgSetText(LPSTR lpsz, LONG cch);
157 ULONG MsgGetTextLength();
158 void MsgGetText(char *wndtext, ULONG textlength);
159 VOID updateWindowStyle(DWORD oldExStyle,DWORD oldStyle);
160
161virtual LONG SetWindowLongA(int index, ULONG value, BOOL fUnicode = FALSE);
162virtual ULONG GetWindowLongA(int index, BOOL fUnicode = FALSE);
163virtual WORD SetWindowWord(int index, WORD value);
164virtual WORD GetWindowWord(int index);
165
166 DWORD getStyle() { return dwStyle; };
167 DWORD getOldStyle() { return dwOldStyle; };
168 void setStyle(DWORD newstyle) { dwStyle = newstyle; };
169 DWORD getExStyle() { return dwExStyle; };
170 void setExStyle(DWORD newexstyle) { dwExStyle = newexstyle; };
171 ULONG getInstance() { return hInstance; };
172 void setInstance(ULONG newinstance) { hInstance = newinstance; };
173 HWND getWindowHandle() { return Win32Hwnd; };
174 HWND getOS2WindowHandle() { return OS2Hwnd; };
175 HWND getOS2FrameWindowHandle() { return OS2HwndFrame; };
176
177 Win32WndClass *getWindowClass() { return windowClass; };
178
179 LONG getLastHitTestVal() { return lastHitTestVal; }
180
181 DWORD getWindowContextHelpId() { return contextHelpId; };
182 void setWindowContextHelpId(DWORD id){ contextHelpId = id; };
183
184 BOOL isFrameWindow();
185virtual BOOL isMDIClient();
186virtual BOOL isMDIChild();
187virtual BOOL isDesktopWindow();
188
189 BOOL fHasParentDC() { return fParentDC; };
190
191Win32BaseWindow *getParent();
192 void setParent(Win32BaseWindow *pwindow) { setParentOfChild((ChildWindow *)pwindow); };
193 WNDPROC getWindowProc() { return win32wndproc; };
194 void setWindowProc(WNDPROC newproc) { win32wndproc = newproc; };
195 DWORD getWindowId() { return dwIDMenu; };
196 void setWindowId(DWORD id);
197 ULONG getWindowHeight() { return rectWindow.bottom - rectWindow.top; };
198 ULONG getWindowWidth() { return rectWindow.right - rectWindow.left; };
199 ULONG getClientHeight() { return rectClient.bottom - rectClient.top; };
200 ULONG getClientWidth() { return rectClient.right - rectClient.left; };
201 BOOL isChild();
202 PRECT getClientRectPtr() { return &rectClient; };
203 void getClientRect(PRECT rect)
204 {
205 *rect = rectClient;
206 rect->right -= rect->left;
207 rect->bottom -= rect->top;
208 rect->left = rect->top = 0;
209 }
210 void setClientRect(PRECT rect) { rectClient = *rect; };
211 PRECT getWindowRect() { return &rectWindow; };
212 void setClientRect(LONG left, LONG top, LONG right, LONG bottom)
213 {
214 rectClient.left = left; rectClient.top = top;
215 rectClient.right = right; rectClient.bottom = bottom;
216 };
217 void setWindowRect(LONG left, LONG top, LONG right, LONG bottom)
218 {
219 rectWindow.left = left; rectWindow.top = top;
220 rectWindow.right = right; rectWindow.bottom = bottom;
221 };
222 void setWindowRect(PRECT rect) { rectWindow = *rect; };
223 DWORD getFlags() { return flags; };
224 void setFlags(DWORD newflags) { flags = newflags; };
225
226 DWORD getCBExtra() { return cbExtra; };
227 PVOID getExtraPtr() { return pExtra; };
228
229 HMENU GetMenu() { return dwIDMenu; };
230 VOID SetMenu(HMENU newMenu) { dwIDMenu = newMenu; };
231 void SetSysMenu(HMENU hSystemMenu) { hSysMenu = hSystemMenu; };
232 HMENU GetSysMenu() { return hSysMenu; }
233
234 HICON IconForWindow(WPARAM fType);
235
236 void SetWindowRegion(HRGN hRegion) { hWindowRegion = hRegion; };
237 HRGN GetWindowRegion() { return hWindowRegion; };
238
239 //Save old clip region for CS_OWNDC windows (in BeginPaint)
240 HRGN GetClipRegion() { return hClipRegion; };
241 void SetClipRegion(HRGN hRegion) { hClipRegion = hRegion; };
242
243 BOOL ShowWindow(ULONG nCmdShow);
244 BOOL SetWindowPos(HWND hwndInsertAfter, int x, int y, int cx, int cy, UINT fuFlags);
245 BOOL SetWindowPlacement(WINDOWPLACEMENT *winpos);
246 BOOL GetWindowPlacement(LPWINDOWPLACEMENT winpos);
247 BOOL ScrollWindow(int dx, int dy);
248virtual BOOL DestroyWindow();
249 HWND SetActiveWindow();
250 BOOL DeactivateChildWindow();
251 HWND GetParent();
252 HWND SetParent(HWND hwndNewParent);
253
254 BOOL IsChild(HWND hwndParent);
255
256 HWND GetTopWindow();
257 HWND GetTopParent();
258
259 HWND GetWindow(UINT uCmd);
260 virtual BOOL EnableWindow(BOOL fEnable);
261 BOOL CloseWindow();
262 static HWND GetActiveWindow();
263 //Window handle has already been verified, so just return true
264 BOOL IsWindow() { return TRUE; };
265 BOOL IsDialog() { return fIsDialog; };
266 BOOL IsModalDialog() { return fIsModalDialog; };
267 BOOL IsModalDialogOwner() { return fIsModalDialogOwner; };
268 VOID setModalDialogOwner(BOOL fMDO) { fIsModalDialogOwner = fMDO; };
269 VOID setOS2HwndModalDialog(HWND aHwnd) { OS2HwndModalDialog = aHwnd; };
270 HWND getOS2HwndModalDialog() { return OS2HwndModalDialog; };
271 BOOL CanReceiveSizeMsgs() { return state >= STATE_PRE_WMCREATE; };
272 BOOL IsParentChanging() { return fParentChange; };
273 BOOL IsWindowCreated() { return state >= STATE_PRE_WMNCCREATE; }
274 BOOL IsWindowDestroyed() { return state >= STATE_DESTROYED; };
275 BOOL IsWindowIconic();
276 //Window procedure type
277 BOOL IsWindowUnicode();
278 BOOL IsMixMaxStateChanging() { return fMinMaxChange; };
279
280 void SetVisibleRegionChanged(BOOL changed) { fVisibleRegionChanged = changed; };
281 BOOL IsVisibleRegionChanged() { return fVisibleRegionChanged; };
282
283 int GetWindowTextLength(BOOL fUnicode);
284 int GetWindowTextLengthA() { return GetWindowTextLength(FALSE); };
285 int GetWindowTextLengthW() { return GetWindowTextLength(TRUE); };
286
287 int GetWindowTextA(LPSTR lpsz, int cch);
288 int GetWindowTextW(LPWSTR lpsz, int cch);
289 BOOL SetWindowTextA(LPSTR lpsz);
290 BOOL SetWindowTextW(LPWSTR lpsz);
291 BOOL hasWindowName(LPSTR wndname, BOOL fUnicode = 0);
292 CHAR *getWindowNamePtrA();
293 WCHAR *getWindowNamePtrW();
294 VOID freeWindowNamePtr(PVOID namePtr);
295 CHAR *getWindowNameA() { return windowNameA; }; //only for MDI windows!
296 WCHAR *getWindowNameW() { return windowNameW; }; //only for MDI windows!
297Win32WndClass *getClass() { return windowClass; };
298Win32BaseWindow *getOwner() { return owner; };
299 void setOwner(Win32BaseWindow *newOwner) { owner = newOwner; };
300
301 SCROLLBAR_INFO *getScrollInfo(int nBar);
302
303 LRESULT SendMessageA(ULONG msg, WPARAM wParam, LPARAM lParam);
304 LRESULT SendMessageW(ULONG msg, WPARAM wParam, LPARAM lParam);
305static LRESULT BroadcastMessageA(int type, UINT msg, WPARAM wParam, LPARAM lParam);
306static LRESULT BroadcastMessageW(int type, UINT msg, WPARAM wParam, LPARAM lParam);
307 void CallWindowHookProc(ULONG hooktype, ULONG Msg, WPARAM wParam, LPARAM lParam, BOOL fUnicode = FALSE);
308
309 LRESULT DefWindowProcA(UINT Msg, WPARAM wParam, LPARAM lParam);
310 LRESULT DefWindowProcW(UINT msg, WPARAM wParam, LPARAM lParam);
311
312 LRESULT DefWndControlColor(UINT ctlType, HDC hdc);
313 LRESULT DefWndPrint(HDC hdc,ULONG uFlags);
314
315 void NotifyParent(UINT Msg, WPARAM wParam, LPARAM lParam);
316
317 HWND FindWindowById(int id);
318
319 static HWND FindWindowEx(HWND hwndParent, HWND hwndChildAfter, ATOM atom, LPSTR lpszWindow);
320
321 BOOL EnumChildWindows(WNDENUMPROC lpfn, LPARAM lParam);
322 BOOL EnumThreadWindows(DWORD dwThreadId, WNDENUMPROC lpfn, LPARAM lParam);
323 BOOL EnumWindows(WNDENUMPROC lpfn, LPARAM lParam);
324
325 HWND getNextDlgGroupItem(HWND hwndCtrl, BOOL fPrevious);
326
327 BOOL isComingToTop() { return fComingToTop; };
328 void setComingToTop(BOOL fTop) { fComingToTop = fTop; };
329 BOOL isInTasklist() { return fTaskList; };
330
331 //window property methods
332 HANDLE getProp(LPCSTR str);
333 BOOL setProp(LPCSTR str, HANDLE handle);
334 HANDLE removeProp(LPCSTR str);
335 INT enumPropsExA(PROPENUMPROCEXA func, LPARAM lParam);
336 INT enumPropsExW(PROPENUMPROCEXW func, LPARAM lParam);
337
338#ifdef DEBUG
339 LONG addRef();
340 LONG release(char *function = __FUNCTION__, int line = __LINE__ );
341#endif
342
343//Locates window in linked list and increases reference count (if found)
344//Window object must be unreferenced after usage
345static Win32BaseWindow *GetWindowFromHandle(HWND hwnd);
346static Win32BaseWindow *GetWindowFromOS2Handle(HWND hwnd);
347static Win32BaseWindow *GetWindowFromOS2FrameHandle(HWND hwnd);
348
349 static void DestroyAll();
350
351protected:
352#ifndef OS2_INCLUDED
353 BOOL CreateWindowExA(CREATESTRUCTA *lpCreateStruct, ATOM classAtom);
354#endif
355 LRESULT SendInternalMessageA(ULONG msg, WPARAM wParam, LPARAM lParam);
356 LRESULT SendInternalMessageW(ULONG msg, WPARAM wParam, LPARAM lParam);
357 void Init();
358
359 void NotifyFrameChanged(WINDOWPOS *wpos, RECT *oldClientRect);
360
361 //called in destructor to remove all (if any) window properties
362 void removeWindowProps();
363 PROPERTY *findWindowProperty(LPCSTR str);
364
365 HWND OS2Hwnd, OS2HwndFrame;
366 HMENU hSysMenu;
367 HWND Win32Hwnd;
368
369 int posx, posy, width, height;
370
371 // values normally contained in the standard window words
372 ULONG dwExStyle; //GWL_EXSTYLE
373 ULONG dwStyle; //GWL_STYLE
374 ULONG dwOldStyle; //Used to determine which frame control buttons to change (OS/2 mode)
375 WNDPROC win32wndproc; //GWL_WNDPROC
376 ULONG hInstance; //GWL_HINSTANCE
377//Moved in ChildWindow class
378///// Win32BaseWindow *parent; //GWL_HWNDPARENT
379 ULONG dwIDMenu; //GWL_ID
380 ULONG userData; //GWL_USERDATA
381
382 ULONG cbExtra;
383 PVOID pExtra;
384
385 HWND hwndLinkAfter;
386 DWORD flags;
387 DWORD contextHelpId;
388 DWORD hotkey;
389 LONG lastHitTestVal; //Last value returned by WM_NCHITTEST handler
390
391 HWND OS2HwndModalDialog;
392
393 ULONG fFirstShow:1,
394 fIsDialog:1,
395 fIsModalDialog:1,
396 fIsModalDialogOwner:1,
397 fInternalMsg:1, //Used to distinguish between messages
398 //sent by PM and those sent by apps
399 fParentChange:1,
400 fDestroyWindowCalled:1, //DestroyWindow was called for this window
401 fTaskList:1, //should be listed in PM tasklist or not
402 fXDefault:1,
403 fCXDefault:1,
404 fParentDC:1,
405 fComingToTop:1,
406 isUnicode:1,
407 fMinMaxChange:1, //set when switching between min/max/restored state
408 fVisibleRegionChanged:1, //set when visible region has changed -> erase background must be sent during next BeginPaint
409 fEraseBkgndFlag:1;
410
411 ULONG state;
412 HRGN hWindowRegion;
413 HRGN hClipRegion;
414
415 DWORD dwThreadId; //id of thread that created this window
416 DWORD dwProcessId; //id of process that created this window
417
418 Win32BaseWindow *owner;
419 HICON hIcon,hIconSm;
420
421 char *windowNameA;
422 WCHAR *windowNameW;
423
424 char *userWindowBytes;
425 ULONG nrUserWindowBytes;
426
427 RECT rectWindow; //relative to parent
428 RECT rectClient; //relative to frame
429WINDOWPLACEMENT windowpos;
430
431 PROPERTY *propertyList;
432
433 HANDLE hTaskList; //PM specific (switchentry handle)
434
435CREATESTRUCTA *tmpcs; //temporary pointer to CREATESTRUCT used in CreateWindowEx
436 ULONG sw; //set in CreateWindowExA, used in MsgCreate method
437
438SCROLLBAR_INFO *vertScrollInfo;
439SCROLLBAR_INFO *horzScrollInfo;
440
441Win32WndClass *windowClass;
442
443static GenericObject *windows;
444static CRITICAL_SECTION critsect;
445
446private:
447#ifndef OS2_INCLUDED
448 void GetMinMaxInfo(POINT *maxSize, POINT *maxPos, POINT *minTrack, POINT *maxTrack );
449 UINT MinMaximize(UINT cmd, LPRECT lpRect);
450 LONG HandleWindowPosChanging(WINDOWPOS *winpos);
451 LONG HandleNCActivate(WPARAM wParam);
452 VOID TrackMinMaxHelpBox(WORD wParam);
453 VOID TrackCloseButton(WORD wParam);
454 VOID TrackScrollBar(WPARAM wParam,POINT pt);
455 LONG HandleNCLButtonDown(WPARAM wParam,LPARAM lParam);
456 LONG HandleNCLButtonDblClk(WPARAM wParam,LPARAM lParam);
457 LONG HandleNCRButtonUp(WPARAM wParam,LPARAM lParam);
458 VOID AdjustRectOuter(LPRECT rect,BOOL menu);
459 VOID AdjustRectInner(LPRECT rect);
460 LONG HandleNCCalcSize(BOOL calcValidRects,RECT *winRect);
461 VOID GetInsideRect(RECT *rect);
462 VOID DrawFrame(HDC hdc,RECT *rect,BOOL dlgFrame,BOOL active);
463public:
464 LONG HandleNCHitTest(POINT pt);
465 BOOL GetSysPopupPos(RECT* rect);
466private:
467 BOOL DrawSysButton(HDC hdc,RECT *rect);
468 BOOL DrawGrayButton(HDC hdc,int x,int y);
469 VOID DrawCloseButton(HDC hdc,RECT *rect,BOOL down,BOOL bGrayed);
470 VOID DrawMaxButton(HDC hdc,RECT *rect,BOOL down,BOOL bGrayed);
471 VOID DrawMinButton(HDC hdc,RECT *rect,BOOL down,BOOL bGrayed);
472 VOID DrawContextHelpButton(HDC hdc,RECT *rect,BOOL down,BOOL bGrayed);
473 VOID DrawCaption(HDC hdc,RECT *rect,BOOL active);
474 VOID DoNCPaint(HRGN clip,BOOL suppress_menupaint);
475 LONG HandleNCPaint(HRGN clip);
476 LONG HandleSysCommand(WPARAM wParam, POINT *pt32);
477
478 LONG SendNCCalcSize(BOOL calcValidRect,
479 RECT *newWindowRect, RECT *oldWindowRect,
480 RECT *oldClientRect, WINDOWPOS *winpos,
481 RECT *newClientRect );
482
483#else
484friend BOOL OS2ToWinMsgTranslate(void *pThdb, QMSG *os2Msg, MSG *winMsg, BOOL isUnicode, BOOL fTranslateExtraMsgs);
485#endif
486
487public:
488 void SetFakeOpen32() { WinSetDAXData (OS2Hwnd, &fakeWinBase); }
489 void RemoveFakeOpen32() { WinSetDAXData (OS2Hwnd, NULL); }
490
491 fakeOpen32WinBaseClass fakeWinBase;
492
493 VOID AdjustMaximizedRect(LPRECT rect);
494 VOID AdjustTrackInfo(PPOINT minTrackSize,PPOINT maxTrackSize);
495
496 //Temporary hack for CS_CLASSDC style (do the same as for CS_OWNDC)
497#ifndef OS2_INCLUDED
498 BOOL isOwnDC() { return (windowClass && windowClass->getStyle() & (CS_OWNDC|CS_CLASSDC)); }
499#else
500 BOOL isOwnDC() { return (windowClass && windowClass->getStyle() & (CS_OWNDC_W|CS_CLASSDC_W)); }
501#endif
502
503 HDC getOwnDC() { return ownDC; }
504 void setOwnDC(HDC hdc) { ownDC = hdc; }
505protected:
506 HDC ownDC;
507
508public:
509 VOID setEraseBkgnd (BOOL erase) { fEraseBkgndFlag = erase; }
510 BOOL needsEraseBkgnd() { return fEraseBkgndFlag; }
511};
512
513#endif //__cplusplus
514
515#endif //__WIN32WNDBASE_H__
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