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 <gdk/gdk.h>
  22 #include <gtk/gtk.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                        int n, const wxString choices[],
  79                        long style, const wxValidator& validator, const wxString &name )
  80 {
  81     m_needParent = TRUE;
  82 #if (GTK_MINOR_VERSION > 0)
  83     m_acceptsFocus = TRUE;
  84 #endif
  85
  86     if (!PreCreation( parent, pos, size ) ||
  87         !CreateBase( parent, id, pos, size, style, validator, name ))
  88     {
  89         wxFAIL_MSG( wxT("wxChoice creation failed") );
  90         return FALSE;
  91     }
  92
  93     m_widget = gtk_option_menu_new();
  94
  95     if ( style & wxCB_SORT )
  96     {
  97         // if our m_strings != NULL, DoAppend() will check for it and insert
  98         // items in the correct order
  99         m_strings = new wxSortedArrayString;
 100     }
 101
 102     GtkWidget *menu = gtk_menu_new();
 103
 104     for (int i = 0; i < n; i++)
 105     {
 106         GtkAppendHelper(menu, choices[i]);
 107     }
 108
 109     gtk_option_menu_set_menu( GTK_OPTION_MENU(m_widget), menu );
 110
 111     m_parent->DoAddChild( this );
 112
 113     PostCreation();
 114
 115     SetFont( parent->GetFont() );
 116
 117     wxSize size_best( DoGetBestSize() );
 118     wxSize new_size( size );
 119     if (new_size.x == -1)
 120         new_size.x = size_best.x;
 121     if (new_size.y == -1)
 122         new_size.y = size_best.y;
 123     if ((new_size.x != size.x) || (new_size.y != size.y))
 124         SetSize( new_size.x, new_size.y );
 125
 126     SetBackgroundColour( parent->GetBackgroundColour() );
 127     SetForegroundColour( parent->GetForegroundColour() );
 128
 129     Show( TRUE );
 130
 131     return TRUE;
 132 }
 133
 134 wxChoice::~wxChoice()
 135 {
 136     Clear();
 137
 138     delete m_strings;
 139 }
 140
 141 int wxChoice::DoAppend( const wxString &item )
 142 {
 143     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice control") );
 144
 145     GtkWidget *menu = gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) );
 146
 147     return GtkAppendHelper(menu, item);
 148 }
 149
 150 void wxChoice::DoSetItemClientData( int n, void* clientData )
 151 {
 152     wxCHECK_RET( m_widget != NULL, wxT("invalid choice control") );
 153
 154     wxNode *node = m_clientList.Nth( n );
 155     wxCHECK_RET( node, wxT("invalid index in wxChoice::DoSetItemClientData") );
 156
 157     node->SetData( (wxObject*) clientData );
 158 }
 159
 160 void* wxChoice::DoGetItemClientData( int n ) const
 161 {
 162     wxCHECK_MSG( m_widget != NULL, NULL, wxT("invalid choice control") );
 163
 164     wxNode *node = m_clientList.Nth( n );
 165     wxCHECK_MSG( node, NULL, wxT("invalid index in wxChoice::DoGetItemClientData") );
 166
 167     return node->Data();
 168 }
 169
 170 void wxChoice::DoSetItemClientObject( int n, wxClientData* clientData )
 171 {
 172     wxCHECK_RET( m_widget != NULL, wxT("invalid choice control") );
 173
 174     wxNode *node = m_clientList.Nth( n );
 175     wxCHECK_RET( node, wxT("invalid index in wxChoice::DoSetItemClientObject") );
 176
 177     wxClientData *cd = (wxClientData*) node->Data();
 178     delete cd;
 179
 180     node->SetData( (wxObject*) clientData );
 181 }
 182
 183 wxClientData* wxChoice::DoGetItemClientObject( int n ) const
 184 {
 185     wxCHECK_MSG( m_widget != NULL, (wxClientData*) NULL, wxT("invalid choice control") );
 186
 187     wxNode *node = m_clientList.Nth( n );
 188     wxCHECK_MSG( node, (wxClientData *)NULL,
 189                  wxT("invalid index in wxChoice::DoGetItemClientObject") );
 190
 191     return (wxClientData*) node->Data();
 192 }
 193
 194 void wxChoice::Clear()
 195 {
 196     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 197
 198     gtk_option_menu_remove_menu( GTK_OPTION_MENU(m_widget) );
 199     GtkWidget *menu = gtk_menu_new();
 200     gtk_option_menu_set_menu( GTK_OPTION_MENU(m_widget), menu );
 201
 202     if ( HasClientObjectData() )
 203     {
 204         // destroy the data (due to Robert's idea of using wxList<wxObject>
 205         // and not wxList<wxClientData> we can't just say
 206         // m_clientList.DeleteContents(TRUE) - this would crash!
 207         wxNode *node = m_clientList.First();
 208         while ( node )
 209         {
 210             delete (wxClientData *)node->Data();
 211             node = node->Next();
 212         }
 213     }
 214     m_clientList.Clear();
 215
 216     if ( m_strings )
 217         m_strings->Clear();
 218 }
 219
 220 void wxChoice::Delete( int WXUNUSED(n) )
 221 {
 222     wxFAIL_MSG( wxT("wxChoice:Delete not implemented") );
 223 }
 224
 225 int wxChoice::FindString( const wxString &string ) const
 226 {
 227     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice") );
 228
 229     // If you read this code once and you think you understand
 230     // it, then you are very wrong. Robert Roebling.
 231
 232     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 233     int count = 0;
 234     GList *child = menu_shell->children;
 235     while (child)
 236     {
 237         GtkBin *bin = GTK_BIN( child->data );
 238         GtkLabel *label = (GtkLabel *) NULL;
 239         if (bin->child) label = GTK_LABEL(bin->child);
 240         if (!label) label = GTK_LABEL( GTK_BUTTON(m_widget)->child );
 241
 242         wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 243
 244        if (string == wxString(label->label,*wxConvCurrent))
 245            return count;
 246
 247        child = child->next;
 248        count++;
 249     }
 250
 251     return -1;
 252 }
 253
 254 int wxChoice::GetSelection() const
 255 {
 256     wxCHECK_MSG( m_widget != NULL, -1, wxT("invalid choice") );
 257
 258     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 259     int count = 0;
 260     GList *child = menu_shell->children;
 261     while (child)
 262     {
 263         GtkBin *bin = GTK_BIN( child->data );
 264         if (!bin->child) return count;
 265         child = child->next;
 266         count++;
 267     }
 268
 269     return -1;
 270 }
 271
 272 void wxChoice::SetString( int WXUNUSED(n), const wxString& WXUNUSED(string) )
 273 {
 274     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 275
 276     wxFAIL_MSG(wxT("not implemented"));
 277 }
 278
 279 wxString wxChoice::GetString( int n ) const
 280 {
 281     wxCHECK_MSG( m_widget != NULL, wxT(""), wxT("invalid choice") );
 282
 283     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 284     int count = 0;
 285     GList *child = menu_shell->children;
 286     while (child)
 287     {
 288         GtkBin *bin = GTK_BIN( child->data );
 289         if (count == n)
 290         {
 291             GtkLabel *label = (GtkLabel *) NULL;
 292             if (bin->child) label = GTK_LABEL(bin->child);
 293             if (!label) label = GTK_LABEL( GTK_BUTTON(m_widget)->child );
 294
 295             wxASSERT_MSG( label != NULL , wxT("wxChoice: invalid label") );
 296
 297             return wxString(label->label,*wxConvCurrent);
 298         }
 299         child = child->next;
 300         count++;
 301     }
 302
 303     wxFAIL_MSG( wxT("wxChoice: invalid index in GetString()") );
 304
 305     return wxT("");
 306 }
 307
 308 int wxChoice::GetCount() const
 309 {
 310     wxCHECK_MSG( m_widget != NULL, 0, wxT("invalid choice") );
 311
 312     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 313     int count = 0;
 314     GList *child = menu_shell->children;
 315     while (child)
 316     {
 317         count++;
 318         child = child->next;
 319     }
 320     return count;
 321 }
 322
 323 void wxChoice::SetSelection( int n )
 324 {
 325     wxCHECK_RET( m_widget != NULL, wxT("invalid choice") );
 326
 327     int tmp = n;
 328     gtk_option_menu_set_history( GTK_OPTION_MENU(m_widget), (gint)tmp );
 329 }
 330
 331 void wxChoice::ApplyWidgetStyle()
 332 {
 333     SetWidgetStyle();
 334
 335     GtkMenuShell *menu_shell = GTK_MENU_SHELL( gtk_option_menu_get_menu( GTK_OPTION_MENU(m_widget) ) );
 336
 337     gtk_widget_set_style( m_widget, m_widgetStyle );
 338     gtk_widget_set_style( GTK_WIDGET( menu_shell ), m_widgetStyle );
 339
 340     GList *child = menu_shell->children;
 341     while (child)
 342     {
 343         gtk_widget_set_style( GTK_WIDGET( child->data ), m_widgetStyle );
 344
 345         GtkBin *bin = GTK_BIN( child->data );
 346         GtkWidget *label = (GtkWidget *) NULL;
 347         if (bin->child) label = bin->child;
 348         if (!label) label = GTK_BUTTON(m_widget)->child;
 349
 350         gtk_widget_set_style( label, m_widgetStyle );
 351
 352         child = child->next;
 353     }
 354 }
 355
 356 size_t wxChoice::GtkAppendHelper(GtkWidget *menu, const wxString& item)
 357 {
 358     GtkWidget *menu_item = gtk_menu_item_new_with_label( item.mbc_str() );
 359
 360     size_t index;
 361     if ( m_strings )
 362     {
 363         // sorted control, need to insert at the correct index
 364         index = m_strings->Add(item);
 365
 366         gtk_menu_insert( GTK_MENU(menu), menu_item, index );
 367
 368         if ( index )
 369         {
 370             m_clientList.Insert( m_clientList.Item(index - 1),
 371                                  (wxObject*) NULL );
 372         }
 373         else
 374         {
 375             m_clientList.Insert( (wxObject*) NULL );
 376         }
 377     }
 378     else
 379     {
 380         // normal control, just append
 381         gtk_menu_append( GTK_MENU(menu), menu_item );
 382
 383         m_clientList.Append( (wxObject*) NULL );
 384
 385         // don't call wxChoice::GetCount() from here because it doesn't work
 386         // if we're called from ctor (and GtkMenuShell is still NULL)
 387         index = m_clientList.GetCount() - 1;
 388     }
 389
 390     if (GTK_WIDGET_REALIZED(m_widget))
 391     {
 392         gtk_widget_realize( menu_item );
 393         gtk_widget_realize( GTK_BIN(menu_item)->child );
 394
 395         if (m_widgetStyle) ApplyWidgetStyle();
 396     }
 397
 398     gtk_signal_connect( GTK_OBJECT( menu_item ), "activate",
 399       GTK_SIGNAL_FUNC(gtk_choice_clicked_callback), (gpointer*)this );
 400
 401     gtk_widget_show( menu_item );
 402
 403     // return the index of the item in the control
 404     return index;
 405 }
 406
 407 wxSize wxChoice::DoGetBestSize() const
 408 {
 409     wxSize ret( wxControl::DoGetBestSize() );
 410
 411     // we know better our horizontal extent: it depends on the longest string
 412     // we have
 413     ret.x = 0;
 414     if ( m_widget )
 415     {
 416         GdkFont *font = m_font.GetInternalFont();
 417
 418         wxCoord width;
 419         size_t count = GetCount();
 420         for ( size_t n = 0; n < count; n++ )
 421         {
 422             width = (wxCoord)gdk_string_width(font, GetString(n).mbc_str());
 423             if ( width > ret.x )
 424                 ret.x = width;
 425         }
 426
 427         // for the choice "=" button
 428         ret.x += 20;
 429     }
 430
 431     // but not less than the minimal width
 432     if ( ret.x < 80 )
 433         ret.x = 80;
 434
 435     ret.y = 16 + gdk_char_height( m_widget->style->font, 'H' );
 436     return ret;
 437 }
 438
 439 #endif