include/wx/clntdata.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/clntdata.h
   3 // Purpose:     A mixin class for holding a wxClientData or void pointer
   4 // Author:      Robin Dunn
   5 // Modified by:
   6 // Created:     9-Oct-2001
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) wxWindows team
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_CLNTDATAH__
  13 #define _WX_CLNTDATAH__
  14
  15 #ifdef __GNUG__
  16     #pragma interface "clntdata.h"
  17 #endif
  18
  19 #include "wx/defs.h"
  20 #include "wx/string.h"
  21
  22 // ----------------------------------------------------------------------------
  23
  24 // what kind of client data do we have?
  25 enum wxClientDataType
  26 {
  27     wxClientData_None,    // we don't know yet because we don't have it at all
  28     wxClientData_Object,  // our client data is typed and we own it
  29     wxClientData_Void     // client data is untyped and we don't own it
  30 };
  31
  32 class WXDLLEXPORT wxClientData
  33 {
  34 public:
  35     wxClientData() { }
  36     virtual ~wxClientData() { }
  37 };
  38
  39 class WXDLLEXPORT wxStringClientData : public wxClientData
  40 {
  41 public:
  42     wxStringClientData() { }
  43     wxStringClientData( const wxString &data ) : m_data(data) { }
  44     void SetData( const wxString &data ) { m_data = data; }
  45     const wxString& GetData() const { return m_data; }
  46
  47 private:
  48     wxString  m_data;
  49 };
  50
  51
  52
  53 // This class is a mixin that provides storage and management of "client
  54 // data."  The client data stored can either be a pointer to a wxClientData
  55 // object in which case it is managed by the container (i.e.  it will delete
  56 // the data when it's destroyed) or an untyped pointer which won't be deleted
  57 // by the container - but not both of them
  58 //
  59 // NOTE:  This functionality is currently duplicated in wxEvtHandler in order
  60 //        to avoid having more than one vtable in that class heirachy.
  61
  62 class WXDLLEXPORT wxClientDataContainer
  63 {
  64 public:
  65     wxClientDataContainer();
  66     virtual ~wxClientDataContainer();
  67
  68     void SetClientObject( wxClientData *data ) { DoSetClientObject(data); }
  69     wxClientData *GetClientObject() const { return DoGetClientObject(); }
  70
  71     void SetClientData( void *data ) { DoSetClientData(data); }
  72     void *GetClientData() const { return DoGetClientData(); }
  73
  74 protected:
  75     // The user data: either an object which will be deleted by the container
  76     // when it's deleted or some raw pointer which we do nothing with - only
  77     // one type of data can be used with the given window (i.e. you cannot set
  78     // the void data and then associate the container with wxClientData or vice
  79     // versa)
  80     union
  81     {
  82         wxClientData *m_clientObject;
  83         void         *m_clientData;
  84     };
  85
  86     // client data accessors
  87     virtual void DoSetClientObject( wxClientData *data );
  88     virtual wxClientData *DoGetClientObject() const;
  89
  90     virtual void DoSetClientData( void *data );
  91     virtual void *DoGetClientData() const;
  92
  93     // what kind of data do we have?
  94     wxClientDataType m_clientDataType;
  95
  96 };
  97
  98 // ----------------------------------------------------------------------------
  99 #endif
 100