src/gtk1/choice.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/choice.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #include "wx/wxprec.h"
  11
  12 #if wxUSE_CHOICE
  13
  14 #include "wx/choice.h"
  15
  16 #ifndef WX_PRECOMP
  17     #include "wx/arrstr.h"
  18 #endif
  19
  20 #include "wx/gtk1/private.h"
  21
  22 //-----------------------------------------------------------------------------
  23 // idle system
  24 //-----------------------------------------------------------------------------
  25
  26 extern void wxapp_install_idle_handler();
  27 extern bool g_isIdle;
  28
  29 //-----------------------------------------------------------------------------
  30 // data
  31 //-----------------------------------------------------------------------------
  32
  33 extern bool   g_blockEventsOnDrag;
  34
  35 //-----------------------------------------------------------------------------
  36 // "activate"
  37 //-----------------------------------------------------------------------------
  38
  39 extern "C" {
  40 static void gtk_choice_clicked_callback( GtkWidget *WXUNUSED(widget), wxChoice *choice )
  41 {
  42     if (g_isIdle)
  43       wxapp_install_idle_handler();
  44
  45     if (!choice->m_hasVMT) return;
  46
  47     if (g_blockEventsOnDrag) return;
  48
  49     int selection = wxNOT_FOUND;
  50
  51     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(choice->GetHandle()) ) );
  52     int count = 0;
  53
  54     GList *child = menu_shell->children;
  55     while (child)
  56     {
  57         GtkBin *bin = GTK_BIN( child->data );
  58         if (!bin->child)
  59         {
  60             selection = count;
  61             break;
  62         }
  63         child = child->next;
  64         count++;
  65     }
  66
  67     choice->m_selection_hack = selection;
  68
  69     wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, choice->GetId() );
  70     int n = choice->GetSelection();
  71
  72     event.SetInt( n );
  73     event.SetString( choice->GetStringSelection() );
  74     event.SetEventObject(choice);
  75
  76     if ( choice->HasClientObjectData() )
  77         event.SetClientObject( choice->GetClientObject(n) );
  78     else if ( choice->HasClientUntypedData() )
  79         event.SetClientData( choice->GetClientData(n) );
  80
  81     choice->GetEventHandler()->ProcessEvent(event);
  82 }
  83 }
  84
  85 //-----------------------------------------------------------------------------
  86 // wxChoice
  87 //-----------------------------------------------------------------------------
  88
  89 IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControlWithItems)
  90
  91 wxChoice::wxChoice()
  92 {
  93     m_strings = (wxSortedArrayString *)NULL;
  94 }
  95
  96 bool wxChoice::Create( wxWindow *parent, wxWindowID id,
  97                        const wxPoint &pos, const wxSize &size,
  98                        const wxArrayString& choices,
  99                        long style, const wxValidator& validator,
 100                        const wxString &name )
 101 {
 102     wxCArrayString chs(choices);
 103
 104     return Create( parent, id, pos, size, chs.GetCount(), chs.GetStrings(),
 105                    style, validator, name );
 106 }
 107
 108 bool wxChoice::Create( wxWindow *parent, wxWindowID id,
 109                        const wxPoint &pos, const wxSize &size,
 110                        int n, const wxString choices[],
 111                        long style, const wxValidator& validator, const wxString &name )
 112 {
 113     m_needParent = true;
 114 #if (GTK_MINOR_VERSION > 0)
 115     m_acceptsFocus = true;
 116 #endif
 117
 118     if (!PreCreation( parent, pos, size ) ||
 119         !CreateBase( parent, id, pos, size, style, validator, name ))
 120     {
 121         wxFAIL_MSG( wxT("wxChoice creation failed") );
 122         return false;
 123     }
 124
 125     m_widget = gtk_option_menu_new();
 126
 127     if ( style & wxCB_SORT )
 128     {
 129         // if our m_strings != NULL, Append() will check for it and insert
 130         // items in the correct order
 131         m_strings = new wxSortedArrayString;
 132     }
 133
 134     // begin with no selection
 135     m_selection_hack = wxNOT_FOUND;
 136
 137     GtkWidget *menu = gtk_menu_new();
 138
 139     for (unsigned int i = 0; i < (unsigned int)n; i++)
 140     {
 141         GtkAddHelper(menu, i, choices[i]);
 142     }
 143
 144     gtk_option_menu_set_menu( GTK_OPTION_MENU(m_widget), menu );
 145
 146     m_parent->DoAddChild( this );
 147
 148     PostCreation(size);
 149     SetInitialSize(size); // need this too because this is a wxControlWithItems
 150
 151     return true;
 152 }
 153
 154 wxChoice::~wxChoice()
 155 {
 156     Clear();
 157
 158     delete m_strings;
 159 }
 160
 161 int wxChoice::DoInsertItems(const wxArrayStringsAdapter & items,
 162                             unsigned int pos,
 163                             void **clientData, wxClientDataType type)
 164 {
 165     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice control") );
 166
 167     const unsigned int count = items.GetCount();
 168
 169     GtkWidget *menu = gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) );
 170
 171     for ( unsigned int i = 0; i < count; ++i, ++pos )
 172     {
 173         int n = GtkAddHelper(menu, pos, items[i]);
 174         if ( n == wxNOT_FOUND )
 175             return n;
 176
 177         AssignNewItemClientData(n, clientData, i, type);
 178     }
 179
 180     // if the item to insert is at or before the selection, and the selection is valid
 181     if (((int)pos <= m_selection_hack) && (m_selection_hack != wxNOT_FOUND))
 182     {
 183         // move the selection forward
 184         m_selection_hack += count;
 185     }
 186
 187     return pos - 1;
 188 }
 189
 190 void wxChoice::DoSetItemClientData(unsigned int n, void* clientData)
 191 {
 192     wxCHECK_RET( m_widget != NULL, wxT("invalid choice control") );
 193
 194     wxList::compatibility_iterator node = m_clientList.Item( n );
 195     wxCHECK_RET( node, wxT("invalid index in wxChoice::DoSetItemClientData") );
 196
 197     node->SetData( (wxObject*) clientData );
 198 }
 199
 200 void* wxChoice::DoGetItemClientData(unsigned int n) const
 201 {
 202     wxCHECK_MSG( m_widget != NULL, NULL, wxT("invalid choice control") );
 203
 204     wxList::compatibility_iterator node = m_clientList.Item( n );
 205     wxCHECK_MSG( node, NULL, wxT("invalid index in wxChoice::DoGetItemClientData") );
 206
 207     return node->GetData();
 208 }
 209
 210 void wxChoice::DoClear()
 211 {
 212     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 213
 214     gtk_option_menu_remove_menu( GTK_OPTION_MENU(m_widget) );
 215     GtkWidget *menu = gtk_menu_new();
 216     gtk_option_menu_set_menu( GTK_OPTION_MENU(m_widget), menu );
 217
 218     m_clientList.Clear();
 219
 220     if ( m_strings )
 221         m_strings->Clear();
 222
 223     // begin with no selection
 224     m_selection_hack = wxNOT_FOUND;
 225 }
 226
 227 void wxChoice::DoDeleteOneItem(unsigned int n)
 228 {
 229     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 230
 231     wxCHECK_RET( IsValid(n), _T("invalid index in wxChoice::Delete") );
 232
 233     // if the item to delete is before the selection, and the selection is valid
 234     if (((int)n < m_selection_hack) && (m_selection_hack != wxNOT_FOUND))
 235     {
 236         // move the selection back one
 237         m_selection_hack--;
 238     }
 239     else if ((int)n == m_selection_hack)
 240     {
 241         // invalidate the selection
 242         m_selection_hack = wxNOT_FOUND;
 243     }
 244
 245     // VZ: apparently GTK+ doesn't have a built-in function to do it (not even
 246     //     in 2.0), hence this dumb implementation -- still better than nothing
 247     const unsigned int count = GetCount();
 248
 249     wxList::compatibility_iterator node = m_clientList.GetFirst();
 250
 251     wxArrayString items;
 252     wxArrayPtrVoid itemsData;
 253     items.Alloc(count);
 254     for ( unsigned i = 0; i < count; i++, node = node->GetNext() )
 255     {
 256         if ( i != n )
 257         {
 258             items.Add(GetString(i));
 259             itemsData.Add(node->GetData());
 260         }
 261     }
 262
 263     wxChoice::DoClear();
 264
 265     void ** const data = &itemsData[0];
 266     if ( HasClientObjectData() )
 267         Append(items, wx_reinterpret_cast(wxClientData **, data));
 268     else
 269         Append(items, data);
 270 }
 271
 272 int wxChoice::FindString( const wxString &string, bool bCase ) const
 273 {
 274     wxCHECK_MSG( m_widget != NULL, wxNOT_FOUND, wxT("invalid choice") );
 275
 276     // If you read this code once and you think you understand
 277     // it, then you are very wrong. Robert Roebling.
 278
 279     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 280     int count = 0;
 281     GList *child = menu_shell->children;
 282     while (child)
 283     {
 284         GtkBin *bin = GTK_BIN( child->data );
 285         GtkLabel *label = (GtkLabel *) NULL;
 286         if (bin->child)
 287             label = GTK_LABEL(bin->child);
 288         if (!label)
 289             label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 290
 291         wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 292
 293          wxString tmp( label->label );
 294
 295          if (string.IsSameAs( tmp, bCase ))
 296             return count;
 297
 298         child = child->next;
 299         count++;
 300     }
 301
 302     return wxNOT_FOUND;
 303 }
 304
 305 int wxChoice::GetSelection() const
 306 {
 307     wxCHECK_MSG( m_widget != NULL, wxNOT_FOUND, wxT("invalid choice") );
 308
 309     return m_selection_hack;
 310
 311 }
 312
 313 void wxChoice::SetString(unsigned int n, const wxString& str )
 314 {
 315     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 316
 317     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 318     unsigned int count = 0;
 319     GList *child = menu_shell->children;
 320     while (child)
 321     {
 322         GtkBin *bin = GTK_BIN( child->data );
 323         if (count == n)
 324         {
 325             GtkLabel *label = (GtkLabel *) NULL;
 326             if (bin->child)
 327                 label = GTK_LABEL(bin->child);
 328             if (!label)
 329                 label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 330
 331             wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 332
 333             gtk_label_set_text( label, wxGTK_CONV( str ) );
 334
 335             return;
 336         }
 337         child = child->next;
 338         count++;
 339     }
 340 }
 341
 342 wxString wxChoice::GetString(unsigned int n) const
 343 {
 344     wxCHECK_MSG( m_widget != NULL, wxEmptyString, wxT("invalid choice") );
 345
 346     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 347     unsigned int count = 0;
 348     GList *child = menu_shell->children;
 349     while (child)
 350     {
 351         GtkBin *bin = GTK_BIN( child->data );
 352         if (count == n)
 353         {
 354             GtkLabel *label = (GtkLabel *) NULL;
 355             if (bin->child)
 356                 label = GTK_LABEL(bin->child);
 357             if (!label)
 358                 label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 359
 360             wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 361
 362             return wxString( label->label );
 363         }
 364         child = child->next;
 365         count++;
 366     }
 367
 368     wxFAIL_MSG( wxT("wxChoice: invalid index in GetString()") );
 369
 370     return wxEmptyString;
 371 }
 372
 373 unsigned int wxChoice::GetCount() const
 374 {
 375     wxCHECK_MSG( m_widget != NULL, 0, wxT("invalid choice") );
 376
 377     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 378     unsigned int count = 0;
 379     GList *child = menu_shell->children;
 380     while (child)
 381     {
 382         count++;
 383         child = child->next;
 384     }
 385     return count;
 386 }
 387
 388 void wxChoice::SetSelection( int n )
 389 {
 390     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 391
 392     int tmp = n;
 393     gtk_option_menu_set_history( GTK_OPTION_MENU(m_widget), (gint)tmp );
 394
 395     // set the local selection variable manually
 396     if (IsValid((unsigned int)n))
 397     {
 398         // a valid selection has been made
 399         m_selection_hack = n;
 400     }
 401     else if ((n == wxNOT_FOUND) || (GetCount() == 0))
 402     {
 403         // invalidates the selection if there are no items
 404         // or if it is specifically set to wxNOT_FOUND
 405         m_selection_hack = wxNOT_FOUND;
 406     }
 407     else
 408     {
 409         // this selects the first item by default if the selection is out of bounds
 410         m_selection_hack = 0;
 411     }
 412 }
 413
 414 void wxChoice::DoApplyWidgetStyle(GtkRcStyle *style)
 415 {
 416     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 417
 418     gtk_widget_modify_style( m_widget, style );
 419     gtk_widget_modify_style( GTK_WIDGET( menu_shell ), style );
 420
 421     GList *child = menu_shell->children;
 422     while (child)
 423     {
 424         gtk_widget_modify_style( GTK_WIDGET( child->data ), style );
 425
 426         GtkBin *bin = GTK_BIN( child->data );
 427         GtkWidget *label = (GtkWidget *) NULL;
 428         if (bin->child)
 429             label = bin->child;
 430         if (!label)
 431             label = BUTTON_CHILD(m_widget);
 432
 433         gtk_widget_modify_style( label, style );
 434
 435         child = child->next;
 436     }
 437 }
 438
 439 int wxChoice::GtkAddHelper(GtkWidget *menu, unsigned int pos, const wxString& item)
 440 {
 441     wxCHECK_MSG(pos<=m_clientList.GetCount(), -1, wxT("invalid index"));
 442
 443     GtkWidget *menu_item = gtk_menu_item_new_with_label( wxGTK_CONV( item ) );
 444
 445     size_t index;
 446     if ( m_strings )
 447     {
 448         // sorted control, need to insert at the correct index
 449         index = m_strings->Add(item);
 450
 451         gtk_menu_insert( GTK_MENU(menu), menu_item, index );
 452
 453         if ( index )
 454         {
 455             m_clientList.Insert( m_clientList.Item(index - 1),
 456                                  (wxObject*) NULL );
 457         }
 458         else
 459         {
 460             m_clientList.Insert( (wxObject*) NULL );
 461         }
 462     }
 463     else
 464     {
 465         // don't call wxChoice::GetCount() from here because it doesn't work
 466         // if we're called from ctor (and GtkMenuShell is still NULL)
 467
 468         // normal control, just append
 469         if (pos == m_clientList.GetCount())
 470         {
 471             gtk_menu_append( GTK_MENU(menu), menu_item );
 472             m_clientList.Append( (wxObject*) NULL );
 473             index = m_clientList.GetCount() - 1;
 474         }
 475         else
 476         {
 477             gtk_menu_insert( GTK_MENU(menu), menu_item, pos );
 478             m_clientList.Insert( pos, (wxObject*) NULL );
 479             index = pos;
 480         }
 481     }
 482
 483     if (GTK_WIDGET_REALIZED(m_widget))
 484     {
 485         gtk_widget_realize( menu_item );
 486         gtk_widget_realize( GTK_BIN(menu_item)->child );
 487
 488         ApplyWidgetStyle();
 489     }
 490
 491     // The best size of a wxChoice should probably
 492     // be changed everytime the control has been
 493     // changed, but at least after adding an item
 494     // it has to change. Adapted from Matt Ownby.
 495     InvalidateBestSize();
 496
 497     gtk_signal_connect_after( GTK_OBJECT( menu_item ), "activate",
 498       GTK_SIGNAL_FUNC(gtk_choice_clicked_callback), (gpointer*)this );
 499
 500     gtk_widget_show( menu_item );
 501
 502     // return the index of the item in the control
 503     return index;
 504 }
 505
 506 wxSize wxChoice::DoGetBestSize() const
 507 {
 508     wxSize ret( wxControl::DoGetBestSize() );
 509
 510     // we know better our horizontal extent: it depends on the longest string
 511     // we have
 512     ret.x = 0;
 513     if ( m_widget )
 514     {
 515         int width;
 516         unsigned int count = GetCount();
 517         for ( unsigned int n = 0; n < count; n++ )
 518         {
 519             GetTextExtent(GetString(n), &width, NULL, NULL, NULL );
 520             if ( width > ret.x )
 521                 ret.x = width;
 522         }
 523
 524         // add extra for the choice "=" button
 525
 526         // VZ: I don't know how to get the right value, it seems to be in
 527         //     GtkOptionMenuProps struct from gtkoptionmenu.c but we can't get
 528         //     to it - maybe we can use gtk_option_menu_size_request() for this
 529         //     somehow?
 530         //
 531         //     This default value works only for the default GTK+ theme (i.e.
 532         //     no theme at all) (FIXME)
 533         static const int widthChoiceIndicator = 35;
 534         ret.x += widthChoiceIndicator;
 535     }
 536
 537     // but not less than the minimal width
 538     if ( ret.x < 80 )
 539         ret.x = 80;
 540
 541     // If this request_size is called with no entries then
 542     // the returned height is wrong. Give it a reasonable
 543     // default value.
 544     if (ret.y <= 18)
 545         ret.y = 8 + GetCharHeight();
 546
 547     CacheBestSize(ret);
 548     return ret;
 549 }
 550
 551 bool wxChoice::IsOwnGtkWindow( GdkWindow *window )
 552 {
 553     return (window == m_widget->window);
 554 }
 555
 556 // static
 557 wxVisualAttributes
 558 wxChoice::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 559 {
 560     return GetDefaultAttributesFromGTKWidget(gtk_option_menu_new);
 561 }
 562
 563
 564 #endif // wxUSE_CHOICE