[教学]：使用ARX修改ACAD的光标

XDSoft

2. 
   
3. Setting the cursor in AutoCAD  
   
4. ID    1731  
   
5. Applies to:    AutoCAD 2000
   
6. AutoCAD 2000I
   
7. AutoCAD 2002
   
8. 
   
9. Date    1/25/2002  
   
10. 
    
11. This document is part of    User Interface     
    
12. 
    
13. 
    
14. Question
    
15. I am setting the Windows cursor to IDC_WAIT before performing a time-consuming
    
16. operation in AutoCAD. However, AutoCAD resets the cursor every time the mouse
    
17. moves. Can I prevent AutoCAD from changing the current cursor?
    
18. Answer
    
19. AutoCAD resets the cursor on each WM_MOUSEMOVE message. To change this behavior,
    
20. you must install a message filter using the acedRegisterFilterWinMsg() function
    
21. and set your cursor in the filter. The following sample demonstates how to do
    
22. this. It also hides the usual AutoCAD crosshair by moving it to the top left
    
23. corner of the window. (As the crosshair is not a usual Windows cursor there
    
24. is no other way to hide it currently.)
    
25. 
    
26. 
    
27. #include "stdafx.h"
    
28. #include "aced.h"
    
29. #include "rxmfcapi.h"
    
30. 
    
31. HCURSOR hWaitCursor ;
    
32. 
    
33. BOOL myCallback (MSG *pMsg) {
    
34.     if ( pMsg->message == WM_MOUSEMOVE ) {
    
35.         if ( pMsg->lParam == 0 ) //----- our own message
    
36.             return (FALSE) ; //----- AutoCAD will move the cross hair up there
    
37.         //----- usual message: set our cursor
    
38.         ::SetCursor (hWaitCursor) ;
    
39.         return (TRUE) ; //----- and don't allow AutoCAD to move the crosshair
    
40.     }
    
41.     return (FALSE) ; //----- let AutoCAD do what he wants to
    
42. }
    
43. 
    
44. void test() {
    
45.     CView *pView =acedGetAcadDwgView () ;
    
46.     hWaitCursor =::LoadCursor (NULL, IDC_WAIT) ;
    
47.     HCURSOR hCursor =::SetCursor (hWaitCursor) ;
    
48.     //----- we need to post the WM_MOUSEMOVE twice and then it works
    
49.     //----- move the mouse to the topleft so the crosshair won't disturb the user
    
50.     for ( int i =0 ; i < 2 ; i++ )
    
51.         pView->PostMessage (WM_MOUSEMOVE, 0L, 0L) ;
    
52. 
    
53.     //----- filter out the WM_MOUSMOVE messages and set our cursor
    
54.     acedRegisterFilterWinMsg (myCallback) ;
    
55. 
    
56.     //----- do the time consuming operation
    
57.     char cResult [256] ;
    
58.     ads_getstring (0, "Enter something:", cResult) ;
    
59. 
    
60.     //----- end the filtering
    
61.     acedRemoveFilterWinMsg (myCallback) ;
    
62.     //----- reset the old cursor
    
63.     ::SetCursor (hCursor) ;
    
64.     CPoint curPos ;
    
65.     //----- display it by posting WM_MOUSEMOVE again twice
    
66.     ::GetCursorPos (&curPos) ;
    
67.     pView->ScreenToClient (&curPos) ;
    
68.     for ( i =0 ; i < 2 ; i++ )
    
69.         pView->PostMessage (WM_MOUSEMOVE, 0L, MAKELPARAM(curPos.x,curPos.y));
    
70. }
    

<br /> Setting the cursor in AutoCAD  <br /> ID    1731  <br /> Applies to:    AutoCAD 2000<br /> AutoCAD 2000I<br /> AutoCAD 2002<br /> <br /> Date    1/25/2002  <br /> <br /> This document is part of    User Interface     <br /> <br /> <br /> Question <br /> I am setting the Windows cursor to IDC_WAIT before performing a time-consuming <br /> operation in AutoCAD. However, AutoCAD resets the cursor every time the mouse <br /> moves. Can I prevent AutoCAD from changing the current cursor?<br /> Answer <br /> AutoCAD resets the cursor on each WM_MOUSEMOVE message. To change this behavior, <br /> you must install a message filter using the acedRegisterFilterWinMsg() function <br /> and set your cursor in the filter. The following sample demonstates how to do <br /> this. It also hides the usual AutoCAD crosshair by moving it to the top left <br /> corner of the window. (As the crosshair is not a usual Windows cursor there <br /> is no other way to hide it currently.)<br /> <br /> <br /> #include "stdafx.h"<br /> #include "aced.h"<br /> #include "rxmfcapi.h"<br /> <br /> HCURSOR hWaitCursor ;<br /> <br /> BOOL myCallback (MSG *pMsg) {<br />     if ( pMsg->message == WM_MOUSEMOVE ) {<br />         if ( pMsg->lParam == 0 ) //----- our own message<br />             return (FALSE) ; //----- AutoCAD will move the cross hair up there<br />         //----- usual message: set our cursor<br />         ::SetCursor (hWaitCursor) ;<br />         return (TRUE) ; //----- and don't allow AutoCAD to move the crosshair<br />     }<br />     return (FALSE) ; //----- let AutoCAD do what he wants to<br /> }<br /> <br /> void test() {<br />     CView *pView =acedGetAcadDwgView () ;<br />     hWaitCursor =::LoadCursor (NULL, IDC_WAIT) ;<br />     HCURSOR hCursor =::SetCursor (hWaitCursor) ;<br />     //----- we need to post the WM_MOUSEMOVE twice and then it works<br />     //----- move the mouse to the topleft so the crosshair won't disturb the user<br />     for ( int i =0 ; i < 2 ; i++ )<br />         pView->PostMessage (WM_MOUSEMOVE, 0L, 0L) ;<br /> <br />     //----- filter out the WM_MOUSMOVE messages and set our cursor<br />     acedRegisterFilterWinMsg (myCallback) ;<br /> <br />     //----- do the time consuming operation<br />     char cResult [256] ;<br />     ads_getstring (0, "Enter something:", cResult) ;<br /> <br />     //----- end the filtering<br />     acedRemoveFilterWinMsg (myCallback) ;<br />     //----- reset the old cursor<br />     ::SetCursor (hCursor) ;<br />     CPoint curPos ;<br />     //----- display it by posting WM_MOUSEMOVE again twice<br />     ::GetCursorPos (&curPos) ;<br />     pView->ScreenToClient (&curPos) ;<br />     for ( i =0 ; i < 2 ; i++ )<br />         pView->PostMessage (WM_MOUSEMOVE, 0L, MAKELPARAM(curPos.x,curPos.y));<br /> }<br />

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