src/gtk/choice.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        choice.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  12 #pragma implementation "choice.h"
  13 #endif
  14
  15 #include "wx/defs.h"
  16
  17 #if wxUSE_CHOICE
  18
  19 #include "wx/choice.h"
  20 #include "wx/arrstr.h"
  21
  22 #include "wx/gtk/private.h"
  23
  24 //-----------------------------------------------------------------------------
  25 // idle system
  26 //-----------------------------------------------------------------------------
  27
  28 extern void wxapp_install_idle_handler();
  29 extern bool g_isIdle;
  30
  31 //-----------------------------------------------------------------------------
  32 // data
  33 //-----------------------------------------------------------------------------
  34
  35 extern bool   g_blockEventsOnDrag;
  36
  37 //-----------------------------------------------------------------------------
  38 // "activate"
  39 //-----------------------------------------------------------------------------
  40
  41 static void gtk_choice_clicked_callback( GtkWidget *WXUNUSED(widget), wxChoice *choice )
  42 {
  43     if (g_isIdle)
  44       wxapp_install_idle_handler();
  45
  46     if (!choice->m_hasVMT) return;
  47
  48     if (g_blockEventsOnDrag) return;
  49
  50     wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, choice->GetId() );
  51     int n = choice->GetSelection();
  52
  53     event.SetInt( n );
  54     event.SetString( choice->GetStringSelection() );
  55     event.SetEventObject(choice);
  56
  57     if ( choice->HasClientObjectData() )
  58         event.SetClientObject( choice->GetClientObject(n) );
  59     else if ( choice->HasClientUntypedData() )
  60         event.SetClientData( choice->GetClientData(n) );
  61
  62     choice->GetEventHandler()->ProcessEvent(event);
  63 }
  64
  65 //-----------------------------------------------------------------------------
  66 // wxChoice
  67 //-----------------------------------------------------------------------------
  68
  69 IMPLEMENT_DYNAMIC_CLASS(wxChoice,wxControl)
  70
  71 wxChoice::wxChoice()
  72 {
  73     m_strings = (wxSortedArrayString *)NULL;
  74 }
  75
  76 bool wxChoice::Create( wxWindow *parent, wxWindowID id,
  77                        const wxPoint &pos, const wxSize &size,
  78                        const wxArrayString& choices,
  79                        long style, const wxValidator& validator,
  80                        const wxString &name )
  81 {
  82     wxCArrayString chs(choices);
  83
  84     return Create( parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
  85                    style, validator, name );
  86 }
  87
  88 bool wxChoice::Create( wxWindow *parent, wxWindowID id,
  89                        const wxPoint &pos, const wxSize &size,
  90                        int n, const wxString choices[],
  91                        long style, const wxValidator& validator, const wxString &name )
  92 {
  93     m_needParent = TRUE;
  94 #if (GTK_MINOR_VERSION > 0)
  95     m_acceptsFocus = TRUE;
  96 #endif
  97
  98     if (!PreCreation( parent, pos, size ) ||
  99         !CreateBase( parent, id, pos, size, style, validator, name ))
 100     {
 101         wxFAIL_MSG( wxT("wxChoice creation failed") );
 102         return FALSE;
 103     }
 104
 105     m_widget = gtk_option_menu_new();
 106
 107     if ( style & wxCB_SORT )
 108     {
 109         // if our m_strings != NULL, DoAppend() will check for it and insert
 110         // items in the correct order
 111         m_strings = new wxSortedArrayString;
 112     }
 113
 114     GtkWidget *menu = gtk_menu_new();
 115
 116     for (int i = 0; i < n; i++)
 117     {
 118         GtkAddHelper(menu, i, choices[i]);
 119     }
 120
 121     gtk_option_menu_set_menu( GTK_OPTION_MENU(m_widget), menu );
 122
 123     m_parent->DoAddChild( this );
 124
 125     PostCreation(size);
 126     SetBestSize(size); // need this too because this is a wxControlWithItems
 127
 128     return TRUE;
 129 }
 130
 131 wxChoice::~wxChoice()
 132 {
 133     Clear();
 134
 135     delete m_strings;
 136 }
 137
 138 int wxChoice::DoAppend( const wxString &item )
 139 {
 140     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice control") );
 141
 142     GtkWidget *menu = gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) );
 143
 144     return GtkAddHelper(menu, GetCount(), item);
 145 }
 146
 147 int wxChoice::DoInsert( const wxString &item, int pos )
 148 {
 149     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice control") );
 150     wxCHECK_MSG( (pos>=0) && (pos<=GetCount()), -1, wxT("invalid index"));
 151
 152     if (pos == GetCount())
 153         return DoAppend(item);
 154
 155     GtkWidget *menu = gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) );
 156
 157     return GtkAddHelper(menu, pos, item);
 158 }
 159
 160 void wxChoice::DoSetItemClientData( int n, void* clientData )
 161 {
 162     wxCHECK_RET( m_widget != NULL, wxT("invalid choice control") );
 163
 164     wxList::compatibility_iterator node = m_clientList.Item( n );
 165     wxCHECK_RET( node, wxT("invalid index in wxChoice::DoSetItemClientData") );
 166
 167     node->SetData( (wxObject*) clientData );
 168 }
 169
 170 void* wxChoice::DoGetItemClientData( int n ) const
 171 {
 172     wxCHECK_MSG( m_widget != NULL, NULL, wxT("invalid choice control") );
 173
 174     wxList::compatibility_iterator node = m_clientList.Item( n );
 175     wxCHECK_MSG( node, NULL, wxT("invalid index in wxChoice::DoGetItemClientData") );
 176
 177     return node->GetData();
 178 }
 179
 180 void wxChoice::DoSetItemClientObject( int n, wxClientData* clientData )
 181 {
 182     wxCHECK_RET( m_widget != NULL, wxT("invalid choice control") );
 183
 184     wxList::compatibility_iterator node = m_clientList.Item( n );
 185     wxCHECK_RET( node, wxT("invalid index in wxChoice::DoSetItemClientObject") );
 186
 187     // wxItemContainer already deletes data for us
 188
 189     node->SetData( (wxObject*) clientData );
 190 }
 191
 192 wxClientData* wxChoice::DoGetItemClientObject( int n ) const
 193 {
 194     wxCHECK_MSG( m_widget != NULL, (wxClientData*) NULL, wxT("invalid choice control") );
 195
 196     wxList::compatibility_iterator node = m_clientList.Item( n );
 197     wxCHECK_MSG( node, (wxClientData *)NULL,
 198                  wxT("invalid index in wxChoice::DoGetItemClientObject") );
 199
 200     return (wxClientData*) node->GetData();
 201 }
 202
 203 void wxChoice::Clear()
 204 {
 205     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 206
 207     gtk_option_menu_remove_menu( GTK_OPTION_MENU(m_widget) );
 208     GtkWidget *menu = gtk_menu_new();
 209     gtk_option_menu_set_menu( GTK_OPTION_MENU(m_widget), menu );
 210
 211     if ( HasClientObjectData() )
 212     {
 213         // destroy the data (due to Robert's idea of using wxList<wxObject>
 214         // and not wxList<wxClientData> we can't just say
 215         // m_clientList.DeleteContents(TRUE) - this would crash!
 216         wxList::compatibility_iterator node = m_clientList.GetFirst();
 217         while ( node )
 218         {
 219             delete (wxClientData *)node->GetData();
 220             node = node->GetNext();
 221         }
 222     }
 223     m_clientList.Clear();
 224
 225     if ( m_strings )
 226         m_strings->Clear();
 227 }
 228
 229 void wxChoice::Delete( int n )
 230 {
 231     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 232
 233     // VZ: apparently GTK+ doesn't have a built-in function to do it (not even
 234     //     in 2.0), hence this dumb implementation -- still better than nothing
 235     int i,
 236         count = GetCount();
 237
 238     wxCHECK_RET( n >= 0 && n < count, _T("invalid index in wxChoice::Delete") );
 239
 240     const bool hasClientData = m_clientDataItemsType != wxClientData_None;
 241     const bool hasObjectData = m_clientDataItemsType == wxClientData_Object;
 242
 243     wxList::compatibility_iterator node = m_clientList.GetFirst();
 244
 245     wxArrayString items;
 246     wxArrayPtrVoid itemsData;
 247     items.Alloc(count);
 248     for ( i = 0; i < count; i++ )
 249     {
 250         if ( i != n )
 251         {
 252             items.Add(GetString(i));
 253             if ( hasClientData )
 254             {
 255                 // also save the client data
 256                 itemsData.Add(node->GetData());
 257             }
 258         }
 259         else // need to delete the client object too
 260         {
 261             if ( hasObjectData )
 262             {
 263                 delete (wxClientData *)node->GetData();
 264             }
 265         }
 266
 267         if ( hasClientData )
 268         {
 269             node = node->GetNext();
 270         }
 271     }
 272
 273     if ( hasObjectData )
 274     {
 275         // prevent Clear() from destroying all client data
 276         m_clientDataItemsType = wxClientData_None;
 277     }
 278
 279     Clear();
 280
 281     for ( i = 0; i < count - 1; i++ )
 282     {
 283         Append(items[i]);
 284
 285         if ( hasObjectData )
 286             SetClientObject(i, (wxClientData *)itemsData[i]);
 287         else if ( hasClientData )
 288             SetClientData(i, itemsData[i]);
 289     }
 290 }
 291
 292 int wxChoice::FindString( const wxString &string ) const
 293 {
 294     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice") );
 295
 296     // If you read this code once and you think you understand
 297     // it, then you are very wrong. Robert Roebling.
 298
 299     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 300     int count = 0;
 301     GList *child = menu_shell->children;
 302     while (child)
 303     {
 304         GtkBin *bin = GTK_BIN( child->data );
 305         GtkLabel *label = (GtkLabel *) NULL;
 306         if (bin->child)
 307             label = GTK_LABEL(bin->child);
 308         if (!label)
 309             label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 310
 311         wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 312
 313 #ifdef __WXGTK20__
 314          wxString tmp( wxGTK_CONV_BACK( gtk_label_get_text( label) ) );
 315 #else
 316          wxString tmp( label->label );
 317 #endif
 318         if (string == tmp)
 319             return count;
 320
 321         child = child->next;
 322         count++;
 323     }
 324
 325     return -1;
 326 }
 327
 328 int wxChoice::GetSelection() const
 329 {
 330     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice") );
 331
 332 #ifdef __WXGTK20__
 333
 334     return gtk_option_menu_get_history( GTK_OPTION_MENU(m_widget) );
 335
 336 #else
 337     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 338     int count = 0;
 339
 340     GList *child = menu_shell->children;
 341     while (child)
 342     {
 343         GtkBin *bin = GTK_BIN( child->data );
 344         if (!bin->child) return count;
 345         child = child->next;
 346         count++;
 347     }
 348
 349     return -1;
 350 #endif
 351 }
 352
 353 void wxChoice::SetString( int n, const wxString& str )
 354 {
 355     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 356
 357     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 358     int count = 0;
 359     GList *child = menu_shell->children;
 360     while (child)
 361     {
 362         GtkBin *bin = GTK_BIN( child->data );
 363         if (count == n)
 364         {
 365             GtkLabel *label = (GtkLabel *) NULL;
 366             if (bin->child)
 367                 label = GTK_LABEL(bin->child);
 368             if (!label)
 369                 label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 370
 371             wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 372
 373             gtk_label_set_text( label, wxGTK_CONV( str ) );
 374
 375             return;
 376         }
 377         child = child->next;
 378         count++;
 379     }
 380 }
 381
 382 wxString wxChoice::GetString( int n ) const
 383 {
 384     wxCHECK_MSG( m_widget != NULL, wxT(""), wxT("invalid choice") );
 385
 386     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 387     int count = 0;
 388     GList *child = menu_shell->children;
 389     while (child)
 390     {
 391         GtkBin *bin = GTK_BIN( child->data );
 392         if (count == n)
 393         {
 394             GtkLabel *label = (GtkLabel *) NULL;
 395             if (bin->child)
 396                 label = GTK_LABEL(bin->child);
 397             if (!label)
 398                 label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 399
 400             wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 401
 402 #ifdef __WXGTK20__
 403             return wxString( wxGTK_CONV_BACK( gtk_label_get_text( label) ) );
 404 #else
 405             return wxString( label->label );
 406 #endif
 407         }
 408         child = child->next;
 409         count++;
 410     }
 411
 412     wxFAIL_MSG( wxT("wxChoice: invalid index in GetString()") );
 413
 414     return wxT("");
 415 }
 416
 417 int wxChoice::GetCount() const
 418 {
 419     wxCHECK_MSG( m_widget != NULL, 0, wxT("invalid choice") );
 420
 421     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 422     int count = 0;
 423     GList *child = menu_shell->children;
 424     while (child)
 425     {
 426         count++;
 427         child = child->next;
 428     }
 429     return count;
 430 }
 431
 432 void wxChoice::SetSelection( int n )
 433 {
 434     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 435
 436     int tmp = n;
 437     gtk_option_menu_set_history( GTK_OPTION_MENU(m_widget), (gint)tmp );
 438 }
 439
 440 void wxChoice::DoApplyWidgetStyle(GtkRcStyle *style)
 441 {
 442     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 443
 444     gtk_widget_modify_style( m_widget, style );
 445     gtk_widget_modify_style( GTK_WIDGET( menu_shell ), style );
 446
 447     GList *child = menu_shell->children;
 448     while (child)
 449     {
 450         gtk_widget_modify_style( GTK_WIDGET( child->data ), style );
 451
 452         GtkBin *bin = GTK_BIN( child->data );
 453         GtkWidget *label = (GtkWidget *) NULL;
 454         if (bin->child)
 455             label = bin->child;
 456         if (!label)
 457             label = BUTTON_CHILD(m_widget);
 458
 459         gtk_widget_modify_style( label, style );
 460
 461         child = child->next;
 462     }
 463 }
 464
 465 int wxChoice::GtkAddHelper(GtkWidget *menu, int pos, const wxString& item)
 466 {
 467     wxCHECK_MSG((pos>=0) && (pos<=(int)m_clientList.GetCount()), -1, wxT("invalid index"));
 468
 469     GtkWidget *menu_item = gtk_menu_item_new_with_label( wxGTK_CONV( item ) );
 470
 471     size_t index;
 472     if ( m_strings )
 473     {
 474         // sorted control, need to insert at the correct index
 475         index = m_strings->Add(item);
 476
 477         gtk_menu_insert( GTK_MENU(menu), menu_item, index );
 478
 479         if ( index )
 480         {
 481             m_clientList.Insert( m_clientList.Item(index - 1),
 482                                  (wxObject*) NULL );
 483         }
 484         else
 485         {
 486             m_clientList.Insert( (wxObject*) NULL );
 487         }
 488     }
 489     else
 490     {
 491         // don't call wxChoice::GetCount() from here because it doesn't work
 492         // if we're called from ctor (and GtkMenuShell is still NULL)
 493
 494         // normal control, just append
 495         if (pos == (int)m_clientList.GetCount())
 496         {
 497         gtk_menu_append( GTK_MENU(menu), menu_item );
 498         m_clientList.Append( (wxObject*) NULL );
 499         index = m_clientList.GetCount() - 1;
 500         }
 501         else
 502         {
 503             gtk_menu_insert( GTK_MENU(menu), menu_item, pos );
 504             m_clientList.Insert( pos, (wxObject*) NULL );
 505             index = pos;
 506         }
 507     }
 508
 509     if (GTK_WIDGET_REALIZED(m_widget))
 510     {
 511         gtk_widget_realize( menu_item );
 512         gtk_widget_realize( GTK_BIN(menu_item)->child );
 513
 514         ApplyWidgetStyle();
 515     }
 516
 517     gtk_signal_connect( GTK_OBJECT( menu_item ), "activate",
 518       GTK_SIGNAL_FUNC(gtk_choice_clicked_callback), (gpointer*)this );
 519
 520     gtk_widget_show( menu_item );
 521
 522     // return the index of the item in the control
 523     return index;
 524 }
 525
 526 wxSize wxChoice::DoGetBestSize() const
 527 {
 528     wxSize ret( wxControl::DoGetBestSize() );
 529
 530     // we know better our horizontal extent: it depends on the longest string
 531     // we have
 532     ret.x = 0;
 533     if ( m_widget )
 534     {
 535         int width;
 536         size_t count = GetCount();
 537         for ( size_t n = 0; n < count; n++ )
 538         {
 539             GetTextExtent( GetString(n), &width, NULL, NULL, NULL );
 540             if ( width > ret.x )
 541                 ret.x = width;
 542         }
 543
 544         // add extra for the choice "=" button
 545
 546         // VZ: I don't know how to get the right value, it seems to be in
 547         //     GtkOptionMenuProps struct from gtkoptionmenu.c but we can't get
 548         //     to it - maybe we can use gtk_option_menu_size_request() for this
 549         //     somehow?
 550         //
 551         //     This default value works only for the default GTK+ theme (i.e.
 552         //     no theme at all) (FIXME)
 553         static const int widthChoiceIndicator = 35;
 554         ret.x += widthChoiceIndicator;
 555     }
 556
 557     // but not less than the minimal width
 558     if ( ret.x < 80 )
 559         ret.x = 80;
 560
 561     // If this request_size is called with no entries then
 562     // the returned height is wrong. Give it a reasonable
 563     // default value.
 564     if (ret.y <= 18)
 565         ret.y = 8 + GetCharHeight();
 566
 567     return ret;
 568 }
 569
 570 bool wxChoice::IsOwnGtkWindow( GdkWindow *window )
 571 {
 572 #ifdef __WXGTK20__
 573     return GTK_BUTTON(m_widget)->event_window;
 574 #else
 575     return (window == m_widget->window);
 576 #endif
 577 }
 578
 579 // static
 580 wxVisualAttributes
 581 wxChoice::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 582 {
 583     return GetDefaultAttributesFromGTKWidget(gtk_option_menu_new);
 584 }
 585
 586
 587 #endif // wxUSE_CHOICE
 588