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Annotation of q_a/samples/subclass/readme.txt, revision 1.1.1.1

1.1       root        1:  Sample: SUBCLASS Program Demonstration
                      2: 
                      3: Summary:
                      4: 
                      5: The SUBCLASS sample demonstrates how a program can subclass
                      6: standard controls in order to extend their normal
                      7: functionality. This sample replaces the window procedure for
                      8: buttons, edit fields, and list boxes.
                      9: 
                     10: More Information:
                     11: 
                     12: The standard subclassing technique is to replace the window
                     13: procedure in the window structure by using:
                     14: 
                     15:    SetWindowLong (hwnd, GWL_WNDPROC, (LONG)
                     16: SubclassWndProc);
                     17: 
                     18: In the SUBCLASS sample, the old window procedure is also
                     19: saved in a structure pointed at by the user data. Thus, any
                     20: functionality can be added to various classes of windows
                     21: without having to know what the class originally was.
                     22: 
                     23: In this sample, the subclass procedure adds the ability to
                     24: move and size the control windows when the application is
                     25: not in "test mode." When the application is in test mode,
                     26: the subclass procedure calls the original window procedure
                     27: and the controls behave as normal. Thus, this sample
                     28: provides the bare bones for a "dialog editor" type of
                     29: program.
                     30: 
                     31: The following is a list of the Win32 API functions used in
                     32: this sample:
                     33: 
                     34:    CallWindowPro  GetMessage     LocalUnlock    SetCursorPos
                     35:    c
                     36:    CheckMenuItem  GetStockObjec  PostQuitMessa  SetROP2
                     37:                   t              ge
                     38:    ClientToScree  GetWindowLong  Rectangle      SetWindowLong
                     39:    n
                     40:    CreateWindow   GetWindowRect  ReleaseCaptur  SetWindowPos
                     41:                                  e
                     42:    DispatchMessa  InvalidateRec  ReleaseDC      ShowWindow
                     43:    ge             t
                     44:    GetCapture     LoadCursor     ScreenToClien  TranslateMess
                     45:                                  t              age
                     46:    GetClientRect  LoadIcon       SelectObject   
                     47:    GetDC          LocalAlloc     SetCapture     
                     48:    GetMenu        LocalHandle    SetCursor      
                     49: 
                     50: 
                     51: 

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