samples/dataview/mymodels.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        mymodels.cpp
   3 // Purpose:     wxDataViewCtrl wxWidgets sample
   4 // Author:      Robert Roebling
   5 // Modified by: Francesco Montorsi, Bo Yang
   6 // Created:     06/01/06
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12
  13 // For compilers that support precompilation, includes "wx/wx.h".
  14 #include "wx/wxprec.h"
  15
  16 #ifdef __BORLANDC__
  17 #pragma hdrstop
  18 #endif
  19
  20 #ifndef WX_PRECOMP
  21     #include "wx/wx.h"
  22 #endif
  23
  24 #include "wx/dataview.h"
  25 #include "mymodels.h"
  26
  27 // ----------------------------------------------------------------------------
  28 // resources
  29 // ----------------------------------------------------------------------------
  30
  31 #include "null.xpm"
  32 #include "wx_small.xpm"
  33
  34
  35 // ----------------------------------------------------------------------------
  36 // MyMusicTreeModel
  37 // ----------------------------------------------------------------------------
  38
  39 MyMusicTreeModel::MyMusicTreeModel()
  40 {
  41     m_root = new MyMusicTreeModelNode( NULL, "My Music" );
  42
  43     // setup pop music
  44     m_pop = new MyMusicTreeModelNode( m_root, "Pop music" );
  45     m_pop->Append(
  46         new MyMusicTreeModelNode( m_pop, "You are not alone", "Michael Jackson", 1995 ) );
  47     m_pop->Append(
  48         new MyMusicTreeModelNode( m_pop, "Take a bow", "Madonna", 1994 ) );
  49     m_root->Append( m_pop );
  50
  51     // setup classical music
  52     m_classical = new MyMusicTreeModelNode( m_root, "Classical music" );
  53     m_ninth = new MyMusicTreeModelNode( m_classical, "Ninth symphony",
  54                                         "Ludwig van Beethoven", 1824 );
  55     m_classical->Append( m_ninth );
  56     m_classical->Append( new MyMusicTreeModelNode( m_classical, "German Requiem",
  57                                                    "Johannes Brahms", 1868 ) );
  58     m_root->Append( m_classical );
  59
  60     m_classicalMusicIsKnownToControl = false;
  61 }
  62
  63 wxString MyMusicTreeModel::GetTitle( const wxDataViewItem &item ) const
  64 {
  65     MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
  66     if (!node)      // happens if item.IsOk()==false
  67         return wxEmptyString;
  68
  69     return node->m_title;
  70 }
  71
  72 wxString MyMusicTreeModel::GetArtist( const wxDataViewItem &item ) const
  73 {
  74     MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
  75     if (!node)      // happens if item.IsOk()==false
  76         return wxEmptyString;
  77
  78     return node->m_artist;
  79 }
  80
  81 int MyMusicTreeModel::GetYear( const wxDataViewItem &item ) const
  82 {
  83     MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
  84     if (!node)      // happens if item.IsOk()==false
  85         return 2000;
  86
  87     return node->m_year;
  88 }
  89
  90 void MyMusicTreeModel::AddToClassical( const wxString &title, const wxString &artist,
  91                                        unsigned int year )
  92 {
  93     if (!m_classical)
  94     {
  95         wxASSERT(m_root);
  96
  97         // it was removed: restore it
  98         m_classical = new MyMusicTreeModelNode( m_root, "Classical music" );
  99         m_root->Append( m_classical );
 100
 101         // notify control
 102         wxDataViewItem child( (void*) m_classical );
 103         wxDataViewItem parent( (void*) m_root );
 104         ItemAdded( parent, child );
 105     }
 106
 107     // add to the classical music node a new node:
 108     MyMusicTreeModelNode *child_node =
 109         new MyMusicTreeModelNode( m_classical, title, artist, year );
 110     m_classical->Append( child_node );
 111
 112     // FIXME: what's m_classicalMusicIsKnownToControl for?
 113     if (m_classicalMusicIsKnownToControl)
 114     {
 115         // notify control
 116         wxDataViewItem child( (void*) child_node );
 117         wxDataViewItem parent( (void*) m_classical );
 118         ItemAdded( parent, child );
 119     }
 120 }
 121
 122 void MyMusicTreeModel::Delete( const wxDataViewItem &item )
 123 {
 124     MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
 125     if (!node)      // happens if item.IsOk()==false
 126         return;
 127
 128     wxDataViewItem parent( node->GetParent() );
 129     if (!parent.IsOk())
 130     {
 131         wxASSERT(node == m_root);
 132
 133         // don't make the control completely empty:
 134         wxLogError( "Cannot remove the root item!" );
 135         return;
 136     }
 137
 138     // is the node one of those we keep stored in special pointers?
 139     if (node == m_pop)
 140         m_pop = NULL;
 141     else if (node == m_classical)
 142         m_classical = NULL;
 143     else if (node == m_ninth)
 144         m_ninth = NULL;
 145
 146     // first remove the node from the parent's array of children;
 147     // NOTE: MyMusicTreeModelNodePtrArray is only an array of _pointers_
 148     //       thus removing the node from it doesn't result in freeing it
 149     node->GetParent()->GetChildren().Remove( node );
 150
 151     // free the node
 152     delete node;
 153
 154     // notify control
 155     ItemDeleted( parent, item );
 156 }
 157
 158 int MyMusicTreeModel::Compare( const wxDataViewItem &item1, const wxDataViewItem &item2,
 159                                unsigned int column, bool ascending ) const
 160 {
 161     wxASSERT(item1.IsOk() && item2.IsOk());
 162         // should never happen
 163
 164     if (IsContainer(item1) && IsContainer(item2))
 165     {
 166         wxVariant value1, value2;
 167         GetValue( value1, item1, 0 );
 168         GetValue( value2, item2, 0 );
 169
 170         wxString str1 = value1.GetString();
 171         wxString str2 = value2.GetString();
 172         int res = str1.Cmp( str2 );
 173         if (res) return res;
 174
 175         // items must be different
 176         wxUIntPtr litem1 = (wxUIntPtr) item1.GetID();
 177         wxUIntPtr litem2 = (wxUIntPtr) item2.GetID();
 178
 179         return litem1-litem2;
 180     }
 181
 182     return wxDataViewModel::Compare( item1, item2, column, ascending );
 183 }
 184
 185 void MyMusicTreeModel::GetValue( wxVariant &variant,
 186                                  const wxDataViewItem &item, unsigned int col ) const
 187 {
 188     wxASSERT(item.IsOk());
 189
 190     MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
 191     switch (col)
 192     {
 193     case 0:
 194         variant = node->m_title;
 195         break;
 196     case 1:
 197         variant = node->m_artist;
 198         break;
 199     case 2:
 200         variant = (long) node->m_year;
 201         break;
 202     case 3:
 203         variant = node->m_quality;
 204         break;
 205     case 4:
 206         // wxMac doesn't conceal the popularity progress renderer, return 0 for containers
 207         if (IsContainer(item))
 208             variant = (long) 0;
 209         else
 210             variant = (long) 80;  // all music is very 80% popular
 211         break;
 212     case 5:
 213         // Make size of red square depend on year
 214         if (GetYear(item) < 1900)
 215             variant = (long) 35;
 216         else
 217             variant = (long) 25;
 218         break;
 219
 220     default:
 221         wxLogError( "MyMusicTreeModel::GetValue: wrong column %d", col );
 222     }
 223 }
 224
 225 bool MyMusicTreeModel::SetValue( const wxVariant &variant,
 226                                  const wxDataViewItem &item, unsigned int col )
 227 {
 228     wxASSERT(item.IsOk());
 229
 230     MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
 231     switch (col)
 232     {
 233         case 0:
 234             node->m_title = variant.GetString();
 235             return true;
 236         case 1:
 237             node->m_artist = variant.GetString();
 238             return true;
 239         case 2:
 240             node->m_year = variant.GetLong();
 241             return true;
 242         case 3:
 243             node->m_quality = variant.GetString();
 244             return true;
 245
 246         default:
 247             wxLogError( "MyMusicTreeModel::SetValue: wrong column" );
 248     }
 249     return false;
 250 }
 251
 252 wxDataViewItem MyMusicTreeModel::GetParent( const wxDataViewItem &item ) const
 253 {
 254     // the invisible root node has no parent
 255     if (!item.IsOk())
 256         return wxDataViewItem(0);
 257
 258     MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
 259
 260     // "MyMusic" also has no parent
 261     if (node == m_root)
 262         return wxDataViewItem(0);
 263
 264     return wxDataViewItem( (void*) node->GetParent() );
 265 }
 266
 267 bool MyMusicTreeModel::IsContainer( const wxDataViewItem &item ) const
 268 {
 269     // the invisble root node can have children
 270     // (in our model always "MyMusic")
 271     if (!item.IsOk())
 272         return true;
 273
 274     MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) item.GetID();
 275     return node->IsContainer();
 276 }
 277
 278 unsigned int MyMusicTreeModel::GetChildren( const wxDataViewItem &parent,
 279                                             wxDataViewItemArray &array ) const
 280 {
 281     MyMusicTreeModelNode *node = (MyMusicTreeModelNode*) parent.GetID();
 282     if (!node)
 283     {
 284         array.Add( wxDataViewItem( (void*) m_root ) );
 285         return 1;
 286     }
 287
 288     if (node == m_classical)
 289     {
 290         MyMusicTreeModel *model = (MyMusicTreeModel*)(const MyMusicTreeModel*) this;
 291         model->m_classicalMusicIsKnownToControl = true;
 292     }
 293
 294     if (node->GetChildCount() == 0)
 295     {
 296         return 0;
 297     }
 298
 299     unsigned int count = node->GetChildren().GetCount();
 300     for (unsigned int pos = 0; pos < count; pos++)
 301     {
 302         MyMusicTreeModelNode *child = node->GetChildren().Item( pos );
 303         array.Add( wxDataViewItem( (void*) child ) );
 304     }
 305
 306     return count;
 307 }
 308
 309
 310
 311 // ----------------------------------------------------------------------------
 312 // MyListModel
 313 // ----------------------------------------------------------------------------
 314
 315 static int my_sort_reverse( int *v1, int *v2 )
 316 {
 317    return *v2-*v1;
 318 }
 319
 320 static int my_sort( int *v1, int *v2 )
 321 {
 322    return *v1-*v2;
 323 }
 324
 325 #ifdef __WXMAC__
 326     #define INITIAL_NUMBER_OF_ITEMS 100
 327 #else
 328     #define INITIAL_NUMBER_OF_ITEMS 100000
 329 #endif
 330
 331 MyListModel::MyListModel() :
 332         wxDataViewVirtualListModel( INITIAL_NUMBER_OF_ITEMS )
 333 {
 334     m_virtualItems = INITIAL_NUMBER_OF_ITEMS;
 335
 336     // the first 100 items are really stored in this model;
 337     // all the others are synthetized on request
 338     for (unsigned int i = 0; i < 100; i++)
 339     {
 340         wxString str;
 341         str.Printf( "real row %d", i );
 342         m_array.Add( str );
 343     }
 344
 345     m_icon[0] = wxIcon( null_xpm );
 346     m_icon[1] = wxIcon( wx_small_xpm );
 347 }
 348
 349 void MyListModel::Prepend( const wxString &text )
 350 {
 351     m_array.Insert( text, 0 );
 352     RowPrepended();
 353 }
 354
 355 void MyListModel::DeleteItem( const wxDataViewItem &item )
 356 {
 357     unsigned int row = GetRow( item );
 358     if (row >= m_array.GetCount())
 359         return;
 360
 361     m_array.RemoveAt( row );
 362     RowDeleted( row );
 363 }
 364
 365 void MyListModel::DeleteItems( const wxDataViewItemArray &items )
 366 {
 367     unsigned i;
 368     wxArrayInt rows;
 369     for (i = 0; i < items.GetCount(); i++)
 370     {
 371         unsigned int row = GetRow( items[i] );
 372         if (row < m_array.GetCount())
 373             rows.Add( row );
 374     }
 375
 376     if (rows.GetCount() == 0)
 377     {
 378         // none of the selected items were in the range of the items
 379         // which we store... for simplicity, don't allow removing them
 380         wxLogError( "Cannot remove rows with an index greater than %d", m_array.GetCount() );
 381         return;
 382     }
 383
 384     // Sort in descending order so that the last
 385     // row will be deleted first. Otherwise the
 386     // remaining indeces would all be wrong.
 387     rows.Sort( my_sort_reverse );
 388     for (i = 0; i < rows.GetCount(); i++)
 389         m_array.RemoveAt( rows[i] );
 390
 391     // This is just to test if wxDataViewCtrl can
 392     // cope with removing rows not sorted in
 393     // descending order
 394     rows.Sort( my_sort );
 395     RowsDeleted( rows );
 396 }
 397
 398 void MyListModel::AddMany()
 399 {
 400     m_virtualItems += 1000;
 401     Reset( m_array.GetCount() + m_virtualItems );
 402 }
 403
 404 void MyListModel::GetValueByRow( wxVariant &variant,
 405                                  unsigned int row, unsigned int col ) const
 406 {
 407     if (col==0)
 408     {
 409         if (row >= m_array.GetCount())
 410             variant = wxString::Format( "virtual row %d", row );
 411         else
 412             variant = m_array[ row ];
 413     }
 414     else if (col==1)
 415     {
 416         wxDataViewIconText data( "test", m_icon[ row%2 ] );
 417         variant << data;
 418     }
 419     else if (col==2)
 420     {
 421         if (row >= m_array.GetCount())
 422             variant = "plain";
 423         else
 424             variant = "blue/green/red";
 425     }
 426 }
 427
 428 bool MyListModel::GetAttrByRow( unsigned int row, unsigned int col,
 429                                 wxDataViewItemAttr &attr )
 430 {
 431     if (col != 2)
 432         return false;
 433
 434     if (row < m_array.GetCount())
 435     {
 436         attr.SetColour( (row%2) == 0 ? *wxBLUE :
 437                             ((row%3) == 0 ? *wxGREEN : *wxRED) );
 438         attr.SetItalic( (row%2) == 5 );
 439     }
 440
 441     return true;
 442 }
 443
 444 bool MyListModel::SetValueByRow( const wxVariant &variant,
 445                                  unsigned int row, unsigned int col )
 446 {
 447     if (col == 0)
 448     {
 449         if (row >= m_array.GetCount())
 450         {
 451             // the item is not in the range of the items
 452             // which we store... for simplicity, don't allow editing it
 453             wxLogError( "Cannot edit rows with an index greater than %d", m_array.GetCount() );
 454             return false;
 455         }
 456
 457         m_array[row] = variant.GetString();
 458         return true;
 459     }
 460
 461     return false;
 462 }