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 #ifdef __GNUG__
  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
  21 #include "wx/gtk/private.h"
  22
  23 //-----------------------------------------------------------------------------
  24 // idle system
  25 //-----------------------------------------------------------------------------
  26
  27 extern void wxapp_install_idle_handler();
  28 extern bool g_isIdle;
  29
  30 //-----------------------------------------------------------------------------
  31 // data
  32 //-----------------------------------------------------------------------------
  33
  34 extern bool   g_blockEventsOnDrag;
  35
  36 //-----------------------------------------------------------------------------
  37 // "activate"
  38 //-----------------------------------------------------------------------------
  39
  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     wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, choice->GetId() );
  50     int n = choice->GetSelection();
  51
  52     event.SetInt( n );
  53     event.SetString( choice->GetStringSelection() );
  54     event.SetEventObject(choice);
  55
  56     if ( choice->HasClientObjectData() )
  57         event.SetClientObject( choice->GetClientObject(n) );
  58     else if ( choice->HasClientUntypedData() )
  59         event.SetClientData( choice->GetClientData(n) );
  60
  61     choice->GetEventHandler()->ProcessEvent(event);
  62 }
  63
  64 //-----------------------------------------------------------------------------
  65 // wxChoice
  66 //-----------------------------------------------------------------------------
  67
  68 IMPLEMENT_DYNAMIC_CLASS(wxChoice,wxControl)
  69
  70 wxChoice::wxChoice()
  71 {
  72     m_strings = (wxSortedArrayString *)NULL;
  73 }
  74
  75 bool wxChoice::Create( wxWindow *parent, wxWindowID id,
  76                        const wxPoint &pos, const wxSize &size,
  77                        int n, const wxString choices[],
  78                        long style, const wxValidator& validator, const wxString &name )
  79 {
  80     m_needParent = TRUE;
  81 #if (GTK_MINOR_VERSION > 0)
  82     m_acceptsFocus = TRUE;
  83 #endif
  84
  85     if (!PreCreation( parent, pos, size ) ||
  86         !CreateBase( parent, id, pos, size, style, validator, name ))
  87     {
  88         wxFAIL_MSG( wxT("wxChoice creation failed") );
  89         return FALSE;
  90     }
  91
  92     m_widget = gtk_option_menu_new();
  93
  94     if ( style & wxCB_SORT )
  95     {
  96         // if our m_strings != NULL, DoAppend() will check for it and insert
  97         // items in the correct order
  98         m_strings = new wxSortedArrayString;
  99     }
 100
 101     GtkWidget *menu = gtk_menu_new();
 102
 103     for (int i = 0; i < n; i++)
 104     {
 105         GtkAppendHelper(menu, choices[i]);
 106     }
 107
 108     gtk_option_menu_set_menu( GTK_OPTION_MENU(m_widget), menu );
 109
 110     m_parent->DoAddChild( this );
 111
 112     PostCreation();
 113
 114     SetFont( parent->GetFont() );
 115
 116     SetBestSize(size);
 117
 118     SetBackgroundColour( parent->GetBackgroundColour() );
 119     SetForegroundColour( parent->GetForegroundColour() );
 120
 121     Show( TRUE );
 122
 123     return TRUE;
 124 }
 125
 126 wxChoice::~wxChoice()
 127 {
 128     Clear();
 129
 130     delete m_strings;
 131 }
 132
 133 int wxChoice::DoAppend( const wxString &item )
 134 {
 135     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice control") );
 136
 137     GtkWidget *menu = gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) );
 138
 139     return GtkAppendHelper(menu, item);
 140 }
 141
 142 void wxChoice::DoSetItemClientData( int n, void* clientData )
 143 {
 144     wxCHECK_RET( m_widget != NULL, wxT("invalid choice control") );
 145
 146     wxNode *node = m_clientList.Item( n );
 147     wxCHECK_RET( node, wxT("invalid index in wxChoice::DoSetItemClientData") );
 148
 149     node->SetData( (wxObject*) clientData );
 150 }
 151
 152 void* wxChoice::DoGetItemClientData( int n ) const
 153 {
 154     wxCHECK_MSG( m_widget != NULL, NULL, wxT("invalid choice control") );
 155
 156     wxNode *node = m_clientList.Item( n );
 157     wxCHECK_MSG( node, NULL, wxT("invalid index in wxChoice::DoGetItemClientData") );
 158
 159     return node->GetData();
 160 }
 161
 162 void wxChoice::DoSetItemClientObject( int n, wxClientData* clientData )
 163 {
 164     wxCHECK_RET( m_widget != NULL, wxT("invalid choice control") );
 165
 166     wxNode *node = m_clientList.Item( n );
 167     wxCHECK_RET( node, wxT("invalid index in wxChoice::DoSetItemClientObject") );
 168
 169     // wxItemContainer already deletes data for us
 170
 171     node->SetData( (wxObject*) clientData );
 172 }
 173
 174 wxClientData* wxChoice::DoGetItemClientObject( int n ) const
 175 {
 176     wxCHECK_MSG( m_widget != NULL, (wxClientData*) NULL, wxT("invalid choice control") );
 177
 178     wxNode *node = m_clientList.Item( n );
 179     wxCHECK_MSG( node, (wxClientData *)NULL,
 180                  wxT("invalid index in wxChoice::DoGetItemClientObject") );
 181
 182     return (wxClientData*) node->GetData();
 183 }
 184
 185 void wxChoice::Clear()
 186 {
 187     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 188
 189     gtk_option_menu_remove_menu( GTK_OPTION_MENU(m_widget) );
 190     GtkWidget *menu = gtk_menu_new();
 191     gtk_option_menu_set_menu( GTK_OPTION_MENU(m_widget), menu );
 192
 193     if ( HasClientObjectData() )
 194     {
 195         // destroy the data (due to Robert's idea of using wxList<wxObject>
 196         // and not wxList<wxClientData> we can't just say
 197         // m_clientList.DeleteContents(TRUE) - this would crash!
 198         wxNode *node = m_clientList.GetFirst();
 199         while ( node )
 200         {
 201             delete (wxClientData *)node->GetData();
 202             node = node->GetNext();
 203         }
 204     }
 205     m_clientList.Clear();
 206
 207     if ( m_strings )
 208         m_strings->Clear();
 209 }
 210
 211 void wxChoice::Delete( int n )
 212 {
 213     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 214
 215     // VZ: apparently GTK+ doesn't have a built-in function to do it (not even
 216     //     in 2.0), hence this dump implementation - still better than nothing
 217     int i,
 218         count = GetCount();
 219
 220     wxCHECK_RET( n >= 0 && n < count, _T("invalid index in wxChoice::Delete") );
 221
 222     wxArrayString items;
 223     items.Alloc(count);
 224     for ( i = 0; i < count; i++ )
 225     {
 226         if ( i != n )
 227             items.Add(GetString(i));
 228     }
 229
 230     Clear();
 231
 232     for ( i = 0; i < count - 1; i++ )
 233     {
 234         Append(items[i]);
 235     }
 236 }
 237
 238 int wxChoice::FindString( const wxString &string ) const
 239 {
 240     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice") );
 241
 242     // If you read this code once and you think you understand
 243     // it, then you are very wrong. Robert Roebling.
 244
 245     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 246     int count = 0;
 247     GList *child = menu_shell->children;
 248     while (child)
 249     {
 250         GtkBin *bin = GTK_BIN( child->data );
 251         GtkLabel *label = (GtkLabel *) NULL;
 252         if (bin->child)
 253             label = GTK_LABEL(bin->child);
 254         if (!label)
 255             label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 256
 257         wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 258
 259 #ifdef __WXGTK20__
 260          wxString tmp( wxGTK_CONV_BACK( gtk_label_get_text( label) ) );
 261 #else
 262          wxString tmp( label->label );
 263 #endif
 264         if (string == tmp)
 265             return count;
 266
 267         child = child->next;
 268         count++;
 269     }
 270
 271     return -1;
 272 }
 273
 274 int wxChoice::GetSelection() const
 275 {
 276     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice") );
 277
 278 #ifdef __WXGTK20__
 279
 280     return gtk_option_menu_get_history( GTK_OPTION_MENU(m_widget) );
 281
 282 #else
 283     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 284     int count = 0;
 285
 286     GList *child = menu_shell->children;
 287     while (child)
 288     {
 289         GtkBin *bin = GTK_BIN( child->data );
 290         if (!bin->child) return count;
 291         child = child->next;
 292         count++;
 293     }
 294
 295     return -1;
 296 #endif
 297 }
 298
 299 void wxChoice::SetString( int WXUNUSED(n), const wxString& WXUNUSED(string) )
 300 {
 301     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 302
 303     wxFAIL_MSG(wxT("not implemented"));
 304 }
 305
 306 wxString wxChoice::GetString( int n ) const
 307 {
 308     wxCHECK_MSG( m_widget != NULL, wxT(""), wxT("invalid choice") );
 309
 310     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 311     int count = 0;
 312     GList *child = menu_shell->children;
 313     while (child)
 314     {
 315         GtkBin *bin = GTK_BIN( child->data );
 316         if (count == n)
 317         {
 318             GtkLabel *label = (GtkLabel *) NULL;
 319             if (bin->child)
 320                 label = GTK_LABEL(bin->child);
 321             if (!label)
 322                 label = GTK_LABEL( BUTTON_CHILD(m_widget) );
 323
 324             wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 325
 326 #ifdef __WXGTK20__
 327             return wxString( wxGTK_CONV_BACK( gtk_label_get_text( label) ) );
 328 #else
 329             return wxString( label->label );
 330 #endif
 331         }
 332         child = child->next;
 333         count++;
 334     }
 335
 336     wxFAIL_MSG( wxT("wxChoice: invalid index in GetString()") );
 337
 338     return wxT("");
 339 }
 340
 341 int wxChoice::GetCount() const
 342 {
 343     wxCHECK_MSG( m_widget != NULL, 0, wxT("invalid choice") );
 344
 345     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 346     int count = 0;
 347     GList *child = menu_shell->children;
 348     while (child)
 349     {
 350         count++;
 351         child = child->next;
 352     }
 353     return count;
 354 }
 355
 356 void wxChoice::SetSelection( int n )
 357 {
 358     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 359
 360     int tmp = n;
 361     gtk_option_menu_set_history( GTK_OPTION_MENU(m_widget), (gint)tmp );
 362 }
 363
 364 void wxChoice::ApplyWidgetStyle()
 365 {
 366     SetWidgetStyle();
 367
 368     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 369
 370     gtk_widget_set_style( m_widget, m_widgetStyle );
 371     gtk_widget_set_style( GTK_WIDGET( menu_shell ), m_widgetStyle );
 372
 373     GList *child = menu_shell->children;
 374     while (child)
 375     {
 376         gtk_widget_set_style( GTK_WIDGET( child->data ), m_widgetStyle );
 377
 378         GtkBin *bin = GTK_BIN( child->data );
 379         GtkWidget *label = (GtkWidget *) NULL;
 380         if (bin->child)
 381             label = bin->child;
 382         if (!label)
 383             label = BUTTON_CHILD(m_widget);
 384
 385         gtk_widget_set_style( label, m_widgetStyle );
 386
 387         child = child->next;
 388     }
 389 }
 390
 391 size_t wxChoice::GtkAppendHelper(GtkWidget *menu, const wxString& item)
 392 {
 393     GtkWidget *menu_item = gtk_menu_item_new_with_label( wxGTK_CONV( item ) );
 394
 395     size_t index;
 396     if ( m_strings )
 397     {
 398         // sorted control, need to insert at the correct index
 399         index = m_strings->Add(item);
 400
 401         gtk_menu_insert( GTK_MENU(menu), menu_item, index );
 402
 403         if ( index )
 404         {
 405             m_clientList.Insert( m_clientList.Item(index - 1),
 406                                  (wxObject*) NULL );
 407         }
 408         else
 409         {
 410             m_clientList.Insert( (wxObject*) NULL );
 411         }
 412     }
 413     else
 414     {
 415         // normal control, just append
 416         gtk_menu_append( GTK_MENU(menu), menu_item );
 417
 418         m_clientList.Append( (wxObject*) NULL );
 419
 420         // don't call wxChoice::GetCount() from here because it doesn't work
 421         // if we're called from ctor (and GtkMenuShell is still NULL)
 422         index = m_clientList.GetCount() - 1;
 423     }
 424
 425     if (GTK_WIDGET_REALIZED(m_widget))
 426     {
 427         gtk_widget_realize( menu_item );
 428         gtk_widget_realize( GTK_BIN(menu_item)->child );
 429
 430         if (m_widgetStyle) ApplyWidgetStyle();
 431     }
 432
 433     gtk_signal_connect( GTK_OBJECT( menu_item ), "activate",
 434       GTK_SIGNAL_FUNC(gtk_choice_clicked_callback), (gpointer*)this );
 435
 436     gtk_widget_show( menu_item );
 437
 438     // return the index of the item in the control
 439     return index;
 440 }
 441
 442 wxSize wxChoice::DoGetBestSize() const
 443 {
 444     wxSize ret( wxControl::DoGetBestSize() );
 445
 446     // we know better our horizontal extent: it depends on the longest string
 447     // we have
 448     ret.x = 0;
 449     if ( m_widget )
 450     {
 451         int width;
 452         size_t count = GetCount();
 453         for ( size_t n = 0; n < count; n++ )
 454         {
 455             GetTextExtent( GetString(n), &width, NULL, NULL, NULL, &m_font );
 456             if ( width > ret.x )
 457                 ret.x = width;
 458         }
 459
 460         // add extra for the choice "=" button
 461
 462         // VZ: I don't know how to get the right value, it seems to be in
 463         //     GtkOptionMenuProps struct from gtkoptionmenu.c but we can't get
 464         //     to it - maybe we can use gtk_option_menu_size_request() for this
 465         //     somehow?
 466         //
 467         //     This default value works only for the default GTK+ theme (i.e.
 468         //     no theme at all) (FIXME)
 469         static const int widthChoiceIndicator = 35;
 470         ret.x += widthChoiceIndicator;
 471     }
 472
 473     // but not less than the minimal width
 474     if ( ret.x < 80 )
 475         ret.x = 80;
 476
 477     ret.y = 16 + GetCharHeight();
 478
 479     return ret;
 480 }
 481
 482 #endif // wxUSE_CHOICE
 483