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) wxWidgets team
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_CLNTDATAH__
  13 #define _WX_CLNTDATAH__
  14
  15 #include "wx/defs.h"
  16 #include "wx/string.h"
  17 #include "wx/hashmap.h"
  18
  19 typedef int (*wxShadowObjectMethod)(void*, void*);
  20 WX_DECLARE_STRING_HASH_MAP_WITH_DECL(
  21     wxShadowObjectMethod,
  22     wxShadowObjectMethods,
  23     class WXDLLIMPEXP_BASE
  24 );
  25 WX_DECLARE_STRING_HASH_MAP_WITH_DECL(
  26     void *,
  27     wxShadowObjectFields,
  28     class WXDLLIMPEXP_BASE
  29 );
  30
  31 class WXDLLIMPEXP_BASE wxShadowObject
  32 {
  33 public:
  34     wxShadowObject() { }
  35
  36     void AddMethod( const wxString &name, wxShadowObjectMethod method )
  37     {
  38         wxShadowObjectMethods::iterator it = m_methods.find( name );
  39         if (it == m_methods.end())
  40             m_methods[ name ] = method;
  41         else
  42             it->second = method;
  43     }
  44
  45     bool InvokeMethod( const wxString &name, void* window, void* param, int* returnValue )
  46     {
  47         wxShadowObjectMethods::iterator it = m_methods.find( name );
  48         if (it == m_methods.end())
  49             return false;
  50         wxShadowObjectMethod method = it->second;
  51         int ret = (*method)(window, param);
  52         if (returnValue)
  53             *returnValue = ret;
  54         return true;
  55     }
  56
  57     void AddField( const wxString &name, void* initialValue = NULL )
  58     {
  59         wxShadowObjectFields::iterator it = m_fields.find( name );
  60         if (it == m_fields.end())
  61             m_fields[ name ] = initialValue;
  62         else
  63             it->second = initialValue;
  64     }
  65
  66     void SetField( const wxString &name, void* value )
  67     {
  68         wxShadowObjectFields::iterator it = m_fields.find( name );
  69         if (it == m_fields.end())
  70             return;
  71         it->second = value;
  72     }
  73
  74     void* GetField( const wxString &name, void *defaultValue = NULL )
  75     {
  76         wxShadowObjectFields::iterator it = m_fields.find( name );
  77         if (it == m_fields.end())
  78             return defaultValue;
  79         return it->second;
  80     }
  81
  82 private:
  83     wxShadowObjectMethods   m_methods;
  84     wxShadowObjectFields    m_fields;
  85 };
  86
  87
  88 // ----------------------------------------------------------------------------
  89
  90 // what kind of client data do we have?
  91 enum wxClientDataType
  92 {
  93     wxClientData_None,    // we don't know yet because we don't have it at all
  94     wxClientData_Object,  // our client data is typed and we own it
  95     wxClientData_Void     // client data is untyped and we don't own it
  96 };
  97
  98 class WXDLLIMPEXP_BASE wxClientData
  99 {
 100 public:
 101     wxClientData() { }
 102     virtual ~wxClientData() { }
 103 };
 104
 105 class WXDLLIMPEXP_BASE wxStringClientData : public wxClientData
 106 {
 107 public:
 108     wxStringClientData() : m_data() { }
 109     wxStringClientData( const wxString &data ) : m_data(data) { }
 110     void SetData( const wxString &data ) { m_data = data; }
 111     const wxString& GetData() const { return m_data; }
 112
 113 private:
 114     wxString  m_data;
 115 };
 116
 117 // This class is a mixin that provides storage and management of "client
 118 // data."  The client data stored can either be a pointer to a wxClientData
 119 // object in which case it is managed by the container (i.e. it will delete
 120 // the data when it's destroyed) or an untyped pointer which won't be deleted
 121 // by the container - but not both of them
 122 //
 123 // NOTE:  This functionality is currently duplicated in wxEvtHandler in order
 124 //        to avoid having more than one vtable in that class hierarchy.
 125
 126 class WXDLLIMPEXP_BASE wxClientDataContainer
 127 {
 128 public:
 129     wxClientDataContainer();
 130     virtual ~wxClientDataContainer();
 131
 132     void SetClientObject( wxClientData *data ) { DoSetClientObject(data); }
 133     wxClientData *GetClientObject() const { return DoGetClientObject(); }
 134
 135     void SetClientData( void *data ) { DoSetClientData(data); }
 136     void *GetClientData() const { return DoGetClientData(); }
 137
 138 protected:
 139     // The user data: either an object which will be deleted by the container
 140     // when it's deleted or some raw pointer which we do nothing with. Only
 141     // one type of data can be used with the given window, i.e. you cannot set
 142     // the void data and then associate the container with wxClientData or vice
 143     // versa.
 144     union
 145     {
 146         wxClientData *m_clientObject;
 147         void         *m_clientData;
 148     };
 149
 150     // client data accessors
 151     virtual void DoSetClientObject( wxClientData *data );
 152     virtual wxClientData *DoGetClientObject() const;
 153
 154     virtual void DoSetClientData( void *data );
 155     virtual void *DoGetClientData() const;
 156
 157     // what kind of data do we have?
 158     wxClientDataType m_clientDataType;
 159
 160 };
 161
 162 #include "wx/vector.h"
 163
 164 struct WXDLLIMPEXP_BASE wxClientDataDictionaryPair
 165 {
 166     wxClientDataDictionaryPair( size_t idx ) : index( idx ), data( 0 ) { }
 167
 168     size_t index;
 169     wxClientData* data;
 170 };
 171
 172 // this class is used internally to maintain the association between items
 173 // of (some subclasses of) wxControlWithItems and their client data
 174 // NOTE: this class does not keep track of whether it contains
 175 // wxClientData or void*. The client must ensure that
 176 // it does not contain a mix of the two, and that
 177 // DestroyData is called if it contains wxClientData
 178 class WXDLLIMPEXP_BASE wxClientDataDictionary
 179 {
 180 public:
 181     wxClientDataDictionary() {}
 182
 183     // deletes all the data
 184     void DestroyData()
 185     {
 186         for( size_t i = 0, end = m_vec.size(); i != end; ++i )
 187             delete m_vec[i].data;
 188         m_vec.clear();
 189     }
 190
 191     // if data for the given index is not present, add it,
 192     // if it is present, delete the old data and replace it with
 193     // the new one
 194     void Set( size_t index, wxClientData* data, bool doDelete )
 195     {
 196         size_t ptr = Find( index );
 197
 198         if( !data )
 199         {
 200             if( ptr == m_vec.size() ) return;
 201             if( doDelete )
 202                 delete m_vec[ptr].data;
 203             m_vec.erase( ptr );
 204         }
 205         else
 206         {
 207             if( ptr == m_vec.size() )
 208             {
 209                 m_vec.push_back( wxClientDataDictionaryPair( index ) );
 210                 ptr = m_vec.size() - 1;
 211             }
 212
 213             if( doDelete )
 214                 delete m_vec[ptr].data;
 215             m_vec[ptr].data = data;
 216         }
 217     }
 218
 219     // get the data associated with the given index,
 220     // return 0 if not found
 221     wxClientData* Get( size_t index ) const
 222     {
 223         size_t it = Find( index );
 224         if( it == m_vec.size() ) return 0;
 225         return (wxClientData*)m_vec[it].data; // const cast
 226     }
 227
 228     // delete the data associated with the given index
 229     // it also decreases by one the indices of all the elements
 230     // with an index greater than the given index
 231     void Delete( size_t index, bool doDelete )
 232     {
 233         size_t todel = m_vec.size();
 234
 235         for( size_t i = 0, end = m_vec.size(); i != end; ++i )
 236         {
 237             if( m_vec[i].index == index )
 238                 todel = i;
 239             else if( m_vec[i].index > index )
 240                 --(m_vec[i].index);
 241         }
 242
 243         if( todel != m_vec.size() )
 244         {
 245             if( doDelete )
 246                 delete m_vec[todel].data;
 247             m_vec.erase( todel );
 248         }
 249     }
 250 private:
 251     // returns MyVec.size() if not found
 252     size_t Find( size_t index ) const
 253     {
 254         for( size_t i = 0, end = m_vec.size(); i != end; ++i )
 255         {
 256             if( m_vec[i].index == index )
 257                 return i;
 258         }
 259
 260         return m_vec.size();
 261     }
 262
 263     wxVector<wxClientDataDictionaryPair> m_vec;
 264 };
 265
 266 #endif // _WX_CLNTDATAH__
 267