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 extern "C" {
  42 static void gtk_choice_clicked_callback( GtkWidget *WXUNUSED(widget), wxChoice *choice )
  43 {
  44     if (g_isIdle)
  45       wxapp_install_idle_handler();
  46
  47     if (!choice->m_hasVMT) return;
  48
  49     if (g_blockEventsOnDrag) return;
  50
  51     int selection = wxNOT_FOUND;
  52
  53 #ifdef __WXGTK20__
  54     selection = gtk_option_menu_get_history( GTK_OPTION_MENU(choice->GetHandle()) );
  55 #else
  56     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(choice->GetHandle()) ) );
  57     int count = 0;
  58
  59     GList *child = menu_shell->children;
  60     while (child)
  61     {
  62         GtkBin *bin = GTK_BIN( child->data );
  63         if (!bin->child)
  64         {
  65             selection = count;
  66             break;
  67         }
  68         child = child->next;
  69         count++;
  70     }
  71 #endif
  72     choice->m_selection_hack = selection;
  73
  74     wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, choice->GetId() );
  75     int n = choice->GetSelection();
  76
  77     event.SetInt( n );
  78     event.SetString( choice->GetStringSelection() );
  79     event.SetEventObject(choice);
  80
  81     if ( choice->HasClientObjectData() )
  82         event.SetClientObject( choice->GetClientObject(n) );
  83     else if ( choice->HasClientUntypedData() )
  84         event.SetClientData( choice->GetClientData(n) );
  85
  86     choice->GetEventHandler()->ProcessEvent(event);
  87 }
  88 }
  89
  90 //-----------------------------------------------------------------------------
  91 // wxChoice
  92 //-----------------------------------------------------------------------------
  93
  94 IMPLEMENT_DYNAMIC_CLASS(wxChoice,wxControl)
  95
  96 wxChoice::wxChoice()
  97 {
  98     m_strings = (wxSortedArrayString *)NULL;
  99 }
 100
 101 bool wxChoice::Create( wxWindow *parent, wxWindowID id,
 102                        const wxPoint &pos, const wxSize &size,
 103                        const wxArrayString& choices,
 104                        long style, const wxValidator& validator,
 105                        const wxString &name )
 106 {
 107     wxCArrayString chs(choices);
 108
 109     return Create( parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 110                    style, validator, name );
 111 }
 112
 113 bool wxChoice::Create( wxWindow *parent, wxWindowID id,
 114                        const wxPoint &pos, const wxSize &size,
 115                        int n, const wxString choices[],
 116                        long style, const wxValidator& validator, const wxString &name )
 117 {
 118     m_needParent = true;
 119 #if (GTK_MINOR_VERSION > 0)
 120     m_acceptsFocus = true;
 121 #endif
 122
 123     if (!PreCreation( parent, pos, size ) ||
 124         !CreateBase( parent, id, pos, size, style, validator, name ))
 125     {
 126         wxFAIL_MSG( wxT("wxChoice creation failed") );
 127         return false;
 128     }
 129
 130     m_widget = gtk_option_menu_new();
 131
 132     if ( style & wxCB_SORT )
 133     {
 134         // if our m_strings != NULL, DoAppend() will check for it and insert
 135         // items in the correct order
 136         m_strings = new wxSortedArrayString;
 137     }
 138
 139     // begin with no selection
 140     m_selection_hack = wxNOT_FOUND;
 141
 142     GtkWidget *menu = gtk_menu_new();
 143
 144     for (int i = 0; i < n; i++)
 145     {
 146         GtkAddHelper(menu, i, choices[i]);
 147     }
 148
 149     gtk_option_menu_set_menu( GTK_OPTION_MENU(m_widget), menu );
 150
 151     m_parent->DoAddChild( this );
 152
 153     PostCreation(size);
 154     SetBestSize(size); // need this too because this is a wxControlWithItems
 155
 156     return true;
 157 }
 158
 159 wxChoice::~wxChoice()
 160 {
 161     Clear();
 162
 163     delete m_strings;
 164 }
 165
 166 int wxChoice::DoAppend( const wxString &item )
 167 {
 168     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice control") );
 169
 170     GtkWidget *menu = gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) );
 171
 172     return GtkAddHelper(menu, GetCount(), item);
 173 }
 174
 175 int wxChoice::DoInsert( const wxString &item, int pos )
 176 {
 177     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice control") );
 178     wxCHECK_MSG( (pos>=0) && (pos<=GetCount()), -1, wxT("invalid index"));
 179
 180     if (pos == GetCount())
 181         return DoAppend(item);
 182
 183     GtkWidget *menu = gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) );
 184
 185     // if the item to insert is at or before the selection, and the selection is valid
 186     if ((pos <= m_selection_hack) && (m_selection_hack != wxNOT_FOUND))
 187     {
 188         // move the selection forward one
 189         m_selection_hack++;
 190     }
 191
 192     return GtkAddHelper(menu, pos, item);
 193 }
 194
 195 void wxChoice::DoSetItemClientData( int n, void* clientData )
 196 {
 197     wxCHECK_RET( m_widget != NULL, wxT("invalid choice control") );
 198
 199     wxList::compatibility_iterator node = m_clientList.Item( n );
 200     wxCHECK_RET( node, wxT("invalid index in wxChoice::DoSetItemClientData") );
 201
 202     node->SetData( (wxObject*) clientData );
 203 }
 204
 205 void* wxChoice::DoGetItemClientData( int n ) const
 206 {
 207     wxCHECK_MSG( m_widget != NULL, NULL, wxT("invalid choice control") );
 208
 209     wxList::compatibility_iterator node = m_clientList.Item( n );
 210     wxCHECK_MSG( node, NULL, wxT("invalid index in wxChoice::DoGetItemClientData") );
 211
 212     return node->GetData();
 213 }
 214
 215 void wxChoice::DoSetItemClientObject( int n, wxClientData* clientData )
 216 {
 217     wxCHECK_RET( m_widget != NULL, wxT("invalid choice control") );
 218
 219     wxList::compatibility_iterator node = m_clientList.Item( n );
 220     wxCHECK_RET( node, wxT("invalid index in wxChoice::DoSetItemClientObject") );
 221
 222     // wxItemContainer already deletes data for us
 223
 224     node->SetData( (wxObject*) clientData );
 225 }
 226
 227 wxClientData* wxChoice::DoGetItemClientObject( int n ) const
 228 {
 229     wxCHECK_MSG( m_widget != NULL, (wxClientData*) NULL, wxT("invalid choice control") );
 230
 231     wxList::compatibility_iterator node = m_clientList.Item( n );
 232     wxCHECK_MSG( node, (wxClientData *)NULL,
 233                  wxT("invalid index in wxChoice::DoGetItemClientObject") );
 234
 235     return (wxClientData*) node->GetData();
 236 }
 237
 238 void wxChoice::Clear()
 239 {
 240     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 241
 242     gtk_option_menu_remove_menu( GTK_OPTION_MENU(m_widget) );
 243     GtkWidget *menu = gtk_menu_new();
 244     gtk_option_menu_set_menu( GTK_OPTION_MENU(m_widget), menu );
 245
 246     if ( HasClientObjectData() )
 247     {
 248         // destroy the data (due to Robert's idea of using wxList<wxObject>
 249         // and not wxList<wxClientData> we can't just say
 250         // m_clientList.DeleteContents(true) - this would crash!
 251         wxList::compatibility_iterator node = m_clientList.GetFirst();
 252         while ( node )
 253         {
 254             delete (wxClientData *)node->GetData();
 255             node = node->GetNext();
 256         }
 257     }
 258     m_clientList.Clear();
 259
 260     if ( m_strings )
 261         m_strings->Clear();
 262
 263     // begin with no selection
 264     m_selection_hack = wxNOT_FOUND;
 265 }
 266
 267 void wxChoice::Delete( int n )
 268 {
 269     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 270
 271     // VZ: apparently GTK+ doesn't have a built-in function to do it (not even
 272     //     in 2.0), hence this dumb implementation -- still better than nothing
 273     int i,
 274         count = GetCount();
 275
 276     wxCHECK_RET( n >= 0 && n < count, _T("invalid index in wxChoice::Delete") );
 277
 278     // if the item to delete is before the selection, and the selection is valid
 279     if ((n < m_selection_hack) && (m_selection_hack != wxNOT_FOUND))
 280     {
 281         // move the selection back one
 282         m_selection_hack--;
 283     }
 284     else if (n == m_selection_hack)
 285     {
 286         // invalidate the selection
 287         m_selection_hack = wxNOT_FOUND;
 288     }
 289
 290     const bool hasClientData = m_clientDataItemsType != wxClientData_None;
 291     const bool hasObjectData = m_clientDataItemsType == wxClientData_Object;
 292
 293     wxList::compatibility_iterator node = m_clientList.GetFirst();
 294
 295     wxArrayString items;
 296     wxArrayPtrVoid itemsData;
 297     items.Alloc(count);
 298     for ( i = 0; i < count; i++ )
 299     {
 300         if ( i != n )
 301         {
 302             items.Add(GetString(i));
 303             if ( hasClientData )
 304             {
 305                 // also save the client data
 306                 itemsData.Add(node->GetData());
 307             }
 308         }
 309         else // need to delete the client object too
 310         {
 311             if ( hasObjectData )
 312             {
 313                 delete (wxClientData *)node->GetData();
 314             }
 315         }
 316
 317         if ( hasClientData )
 318         {
 319             node = node->GetNext();
 320         }
 321     }
 322
 323     if ( hasObjectData )
 324     {
 325         // prevent Clear() from destroying all client data
 326         m_clientDataItemsType = wxClientData_None;
 327     }
 328
 329     Clear();
 330
 331     for ( i = 0; i < count - 1; i++ )
 332     {
 333         Append(items[i]);
 334
 335         if ( hasObjectData )
 336             SetClientObject(i, (wxClientData *)itemsData[i]);
 337         else if ( hasClientData )
 338             SetClientData(i, itemsData[i]);
 339     }
 340 }
 341
 342 int wxChoice::FindString( const wxString &string ) const
 343 {
 344     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice") );
 345
 346     // If you read this code once and you think you understand
 347     // it, then you are very wrong. Robert Roebling.
 348
 349     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 350     int count = 0;
 351     GList *child = menu_shell->children;
 352     while (child)
 353     {
 354         GtkBin *bin = GTK_BIN( child->data );
 355         GtkLabel *label = (GtkLabel *) NULL;
 356         if (bin->child)
 357             label = GTK_LABEL(bin->child);
 358         if (!label)
 359             label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 360
 361         wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 362
 363 #ifdef __WXGTK20__
 364          wxString tmp( wxGTK_CONV_BACK( gtk_label_get_text( label) ) );
 365 #else
 366          wxString tmp( label->label );
 367 #endif
 368         if (string == tmp)
 369             return count;
 370
 371         child = child->next;
 372         count++;
 373     }
 374
 375     return wxNOT_FOUND;
 376 }
 377
 378 int wxChoice::GetSelection() const
 379 {
 380     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice") );
 381
 382     return m_selection_hack;
 383
 384 }
 385
 386 void wxChoice::SetString( int n, const wxString& str )
 387 {
 388     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 389
 390     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 391     int count = 0;
 392     GList *child = menu_shell->children;
 393     while (child)
 394     {
 395         GtkBin *bin = GTK_BIN( child->data );
 396         if (count == n)
 397         {
 398             GtkLabel *label = (GtkLabel *) NULL;
 399             if (bin->child)
 400                 label = GTK_LABEL(bin->child);
 401             if (!label)
 402                 label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 403
 404             wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 405
 406             gtk_label_set_text( label, wxGTK_CONV( str ) );
 407
 408             return;
 409         }
 410         child = child->next;
 411         count++;
 412     }
 413 }
 414
 415 wxString wxChoice::GetString( int n ) const
 416 {
 417     wxCHECK_MSG( m_widget != NULL, wxEmptyString, wxT("invalid choice") );
 418
 419     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 420     int count = 0;
 421     GList *child = menu_shell->children;
 422     while (child)
 423     {
 424         GtkBin *bin = GTK_BIN( child->data );
 425         if (count == n)
 426         {
 427             GtkLabel *label = (GtkLabel *) NULL;
 428             if (bin->child)
 429                 label = GTK_LABEL(bin->child);
 430             if (!label)
 431                 label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 432
 433             wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 434
 435 #ifdef __WXGTK20__
 436             return wxString( wxGTK_CONV_BACK( gtk_label_get_text( label) ) );
 437 #else
 438             return wxString( label->label );
 439 #endif
 440         }
 441         child = child->next;
 442         count++;
 443     }
 444
 445     wxFAIL_MSG( wxT("wxChoice: invalid index in GetString()") );
 446
 447     return wxEmptyString;
 448 }
 449
 450 int wxChoice::GetCount() const
 451 {
 452     wxCHECK_MSG( m_widget != NULL, 0, wxT("invalid choice") );
 453
 454     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 455     int count = 0;
 456     GList *child = menu_shell->children;
 457     while (child)
 458     {
 459         count++;
 460         child = child->next;
 461     }
 462     return count;
 463 }
 464
 465 void wxChoice::SetSelection( int n )
 466 {
 467     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 468
 469     int tmp = n;
 470     gtk_option_menu_set_history( GTK_OPTION_MENU(m_widget), (gint)tmp );
 471
 472     // set the local selection variable manually
 473     if ((n >= 0) && (n < GetCount()))
 474     {
 475         // a valid selection has been made
 476         m_selection_hack = n;
 477     }
 478     else if ((n == wxNOT_FOUND) || (GetCount() == 0))
 479     {
 480         // invalidates the selection if there are no items
 481         // or if it is specifically set to wxNOT_FOUND
 482         m_selection_hack = wxNOT_FOUND;
 483     }
 484     else
 485     {
 486         // this selects the first item by default if the selection is out of bounds
 487         m_selection_hack = 0;
 488     }
 489 }
 490
 491 void wxChoice::DoApplyWidgetStyle(GtkRcStyle *style)
 492 {
 493     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 494
 495     gtk_widget_modify_style( m_widget, style );
 496     gtk_widget_modify_style( GTK_WIDGET( menu_shell ), style );
 497
 498     GList *child = menu_shell->children;
 499     while (child)
 500     {
 501         gtk_widget_modify_style( GTK_WIDGET( child->data ), style );
 502
 503         GtkBin *bin = GTK_BIN( child->data );
 504         GtkWidget *label = (GtkWidget *) NULL;
 505         if (bin->child)
 506             label = bin->child;
 507         if (!label)
 508             label = BUTTON_CHILD(m_widget);
 509
 510         gtk_widget_modify_style( label, style );
 511
 512         child = child->next;
 513     }
 514 }
 515
 516 int wxChoice::GtkAddHelper(GtkWidget *menu, int pos, const wxString& item)
 517 {
 518     wxCHECK_MSG((pos>=0) && (pos<=(int)m_clientList.GetCount()), -1, wxT("invalid index"));
 519
 520     GtkWidget *menu_item = gtk_menu_item_new_with_label( wxGTK_CONV( item ) );
 521
 522     size_t index;
 523     if ( m_strings )
 524     {
 525         // sorted control, need to insert at the correct index
 526         index = m_strings->Add(item);
 527
 528         gtk_menu_insert( GTK_MENU(menu), menu_item, index );
 529
 530         if ( index )
 531         {
 532             m_clientList.Insert( m_clientList.Item(index - 1),
 533                                  (wxObject*) NULL );
 534         }
 535         else
 536         {
 537             m_clientList.Insert( (wxObject*) NULL );
 538         }
 539     }
 540     else
 541     {
 542         // don't call wxChoice::GetCount() from here because it doesn't work
 543         // if we're called from ctor (and GtkMenuShell is still NULL)
 544
 545         // normal control, just append
 546         if (pos == (int)m_clientList.GetCount())
 547         {
 548             gtk_menu_append( GTK_MENU(menu), menu_item );
 549             m_clientList.Append( (wxObject*) NULL );
 550             index = m_clientList.GetCount() - 1;
 551         }
 552         else
 553         {
 554             gtk_menu_insert( GTK_MENU(menu), menu_item, pos );
 555             m_clientList.Insert( pos, (wxObject*) NULL );
 556             index = pos;
 557         }
 558     }
 559
 560     if (GTK_WIDGET_REALIZED(m_widget))
 561     {
 562         gtk_widget_realize( menu_item );
 563         gtk_widget_realize( GTK_BIN(menu_item)->child );
 564
 565         ApplyWidgetStyle();
 566     }
 567
 568     // The best size of a wxChoice should probably
 569     // be changed everytime the control has been
 570     // changed, but at least after adding an item
 571     // it has to change. Adapted from Matt Ownby.
 572     InvalidateBestSize();
 573
 574     gtk_signal_connect_after( GTK_OBJECT( menu_item ), "activate",
 575       GTK_SIGNAL_FUNC(gtk_choice_clicked_callback), (gpointer*)this );
 576
 577     gtk_widget_show( menu_item );
 578
 579     // return the index of the item in the control
 580     return index;
 581 }
 582
 583 wxSize wxChoice::DoGetBestSize() const
 584 {
 585     wxSize ret( wxControl::DoGetBestSize() );
 586
 587     // we know better our horizontal extent: it depends on the longest string
 588     // we have
 589     ret.x = 0;
 590     if ( m_widget )
 591     {
 592         int width;
 593         size_t count = GetCount();
 594         for ( size_t n = 0; n < count; n++ )
 595         {
 596             GetTextExtent( GetString(n), &width, NULL, NULL, NULL );
 597             if ( width > ret.x )
 598                 ret.x = width;
 599         }
 600
 601         // add extra for the choice "=" button
 602
 603         // VZ: I don't know how to get the right value, it seems to be in
 604         //     GtkOptionMenuProps struct from gtkoptionmenu.c but we can't get
 605         //     to it - maybe we can use gtk_option_menu_size_request() for this
 606         //     somehow?
 607         //
 608         //     This default value works only for the default GTK+ theme (i.e.
 609         //     no theme at all) (FIXME)
 610         static const int widthChoiceIndicator = 35;
 611         ret.x += widthChoiceIndicator;
 612     }
 613
 614     // but not less than the minimal width
 615     if ( ret.x < 80 )
 616         ret.x = 80;
 617
 618     // If this request_size is called with no entries then
 619     // the returned height is wrong. Give it a reasonable
 620     // default value.
 621     if (ret.y <= 18)
 622         ret.y = 8 + GetCharHeight();
 623
 624     CacheBestSize(ret);
 625     return ret;
 626 }
 627
 628 bool wxChoice::IsOwnGtkWindow( GdkWindow *window )
 629 {
 630 #ifdef __WXGTK20__
 631     return GTK_BUTTON(m_widget)->event_window;
 632 #else
 633     return (window == m_widget->window);
 634 #endif
 635 }
 636
 637 // static
 638 wxVisualAttributes
 639 wxChoice::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 640 {
 641     return GetDefaultAttributesFromGTKWidget(gtk_option_menu_new);
 642 }
 643
 644
 645 #endif // wxUSE_CHOICE