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