src/msw/combo.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/combo.cpp
   3 // Purpose:     wxMSW wxComboCtrl
   4 // Author:      Jaakko Salli
   5 // Modified by:
   6 // Created:     Apr-30-2006
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2005 Jaakko Salli
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #if wxUSE_COMBOCTRL
  27
  28 #ifndef WX_PRECOMP
  29     #include "wx/log.h"
  30     #include "wx/combobox.h"
  31     #include "wx/dcclient.h"
  32     #include "wx/settings.h"
  33     #include "wx/dialog.h"
  34     #include "wx/stopwatch.h"
  35 #endif
  36
  37 #include "wx/dcbuffer.h"
  38 #include "wx/combo.h"
  39
  40 #include "wx/msw/registry.h"
  41 #include "wx/msw/uxtheme.h"
  42
  43 // Change to #if 1 to include tmschema.h for easier testing of theme
  44 // parameters.
  45 #if 0
  46     #include <tmschema.h>
  47 #else
  48     //----------------------------------
  49     #define EP_EDITTEXT         1
  50     #define ETS_NORMAL          1
  51     #define ETS_HOT             2
  52     #define ETS_SELECTED        3
  53     #define ETS_DISABLED        4
  54     #define ETS_FOCUSED         5
  55     #define ETS_READONLY        6
  56     #define ETS_ASSIST          7
  57     #define TMT_FILLCOLOR       3802
  58     #define TMT_TEXTCOLOR       3803
  59     #define TMT_BORDERCOLOR     3801
  60     #define TMT_EDGEFILLCOLOR   3808
  61     //----------------------------------
  62 #endif
  63
  64
  65 #define NATIVE_TEXT_INDENT_XP       4
  66 #define NATIVE_TEXT_INDENT_CLASSIC  2
  67
  68 #define TEXTCTRLXADJUST_XP          1
  69 #define TEXTCTRLYADJUST_XP          3
  70 #define TEXTCTRLXADJUST_CLASSIC     1
  71 #define TEXTCTRLYADJUST_CLASSIC     2
  72
  73 #define COMBOBOX_ANIMATION_RESOLUTION   10
  74
  75 #define COMBOBOX_ANIMATION_DURATION     200  // In milliseconds
  76
  77 #define wxMSW_DESKTOP_USERPREFERENCESMASK_COMBOBOXANIM    (1<<2)
  78
  79
  80 // ============================================================================
  81 // implementation
  82 // ============================================================================
  83
  84
  85 BEGIN_EVENT_TABLE(wxComboCtrl, wxComboCtrlBase)
  86     EVT_PAINT(wxComboCtrl::OnPaintEvent)
  87     EVT_MOUSE_EVENTS(wxComboCtrl::OnMouseEvent)
  88 #if wxUSE_COMBOCTRL_POPUP_ANIMATION
  89     EVT_TIMER(wxID_ANY, wxComboCtrl::OnTimerEvent)
  90 #endif
  91 END_EVENT_TABLE()
  92
  93
  94 IMPLEMENT_DYNAMIC_CLASS(wxComboCtrl, wxComboCtrlBase)
  95
  96 void wxComboCtrl::Init()
  97 {
  98 }
  99
 100 bool wxComboCtrl::Create(wxWindow *parent,
 101                             wxWindowID id,
 102                             const wxString& value,
 103                             const wxPoint& pos,
 104                             const wxSize& size,
 105                             long style,
 106                             const wxValidator& validator,
 107                             const wxString& name)
 108 {
 109
 110     // Set border
 111     long border = style & wxBORDER_MASK;
 112
 113     wxUxThemeEngine* theme = wxUxThemeEngine::GetIfActive();
 114
 115     if ( !border )
 116     {
 117         // For XP, have 1-width custom border, for older version use sunken
 118         if ( theme )
 119         {
 120             border = wxBORDER_NONE;
 121             m_widthCustomBorder = 1;
 122         }
 123         else
 124             border = wxBORDER_SUNKEN;
 125
 126         style = (style & ~(wxBORDER_MASK)) | border;
 127     }
 128
 129     // create main window
 130     if ( !wxComboCtrlBase::Create(parent,
 131                            id,
 132                            value,
 133                            pos,
 134                            size,
 135                            style | wxFULL_REPAINT_ON_RESIZE,
 136                            wxDefaultValidator,
 137                            name) )
 138         return false;
 139
 140     if ( style & wxCC_STD_BUTTON )
 141         m_iFlags |= wxCC_POPUP_ON_MOUSE_UP;
 142
 143     // Create textctrl, if necessary
 144     CreateTextCtrl( wxNO_BORDER, validator );
 145
 146     // Add keyboard input handlers for main control and textctrl
 147     InstallInputHandlers();
 148
 149     // Prepare background for double-buffering
 150     SetBackgroundStyle( wxBG_STYLE_CUSTOM );
 151
 152     // SetInitialSize should be called last
 153     SetInitialSize(size);
 154
 155     return true;
 156 }
 157
 158 wxComboCtrl::~wxComboCtrl()
 159 {
 160 }
 161
 162 void wxComboCtrl::OnThemeChange()
 163 {
 164     wxUxThemeEngine* theme = wxUxThemeEngine::GetIfActive();
 165     if ( theme )
 166     {
 167         wxUxThemeHandle hTheme(this, L"COMBOBOX");
 168
 169         COLORREF col;
 170         theme->GetThemeColor(hTheme,EP_EDITTEXT,ETS_NORMAL,TMT_FILLCOLOR,&col);
 171         SetBackgroundColour(wxRGBToColour(col));
 172         theme->GetThemeColor(hTheme,EP_EDITTEXT,ETS_NORMAL,TMT_TEXTCOLOR,&col);
 173         SetForegroundColour(wxRGBToColour(col));
 174     }
 175     else
 176     {
 177         SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 178         SetForegroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT));
 179     }
 180 }
 181
 182 void wxComboCtrl::OnResize()
 183 {
 184     //
 185     // Recalculates button and textctrl areas
 186
 187     int textCtrlXAdjust;
 188     int textCtrlYAdjust;
 189
 190     if ( wxUxThemeEngine::GetIfActive() )
 191     {
 192         textCtrlXAdjust = TEXTCTRLXADJUST_XP;
 193         textCtrlYAdjust = TEXTCTRLYADJUST_XP;
 194     }
 195     else
 196     {
 197         textCtrlXAdjust = TEXTCTRLXADJUST_CLASSIC;
 198         textCtrlYAdjust = TEXTCTRLYADJUST_CLASSIC;
 199     }
 200
 201     // Technically Classic Windows style combo has more narrow button,
 202     // but the native renderer doesn't paint it well like that.
 203     int btnWidth = 17;
 204     CalculateAreas(btnWidth);
 205
 206     // Position textctrl using standard routine
 207     PositionTextCtrl(textCtrlXAdjust,textCtrlYAdjust);
 208 }
 209
 210 // Draws non-XP GUI dotted line around the focus area
 211 static void wxMSWDrawFocusRect( wxDC& dc, const wxRect& rect )
 212 {
 213 #if !defined(__WXWINCE__)
 214     /*
 215     RECT mswRect;
 216     mswRect.left = rect.x;
 217     mswRect.top = rect.y;
 218     mswRect.right = rect.x + rect.width;
 219     mswRect.bottom = rect.y + rect.height;
 220     HDC hdc = (HDC) dc.GetHDC();
 221     SetMapMode(hdc,MM_TEXT); // Just in case...
 222     DrawFocusRect(hdc,&mswRect);
 223     */
 224     // FIXME: Use DrawFocusRect code above (currently it draws solid line
 225     //   for caption focus but works ok for other stuff).
 226     //   Also, this code below may not work in future wx versions, since
 227     //   it employs wxCAP_BUTT hack to have line of width 1.
 228     dc.SetLogicalFunction(wxINVERT);
 229
 230     wxPen pen(*wxBLACK,1,wxDOT);
 231     pen.SetCap(wxCAP_BUTT);
 232     dc.SetPen(pen);
 233     dc.SetBrush(*wxTRANSPARENT_BRUSH);
 234
 235     dc.DrawRectangle(rect);
 236
 237     dc.SetLogicalFunction(wxCOPY);
 238 #else
 239     dc.SetLogicalFunction(wxINVERT);
 240
 241     dc.SetPen(wxPen(*wxBLACK,1,wxDOT));
 242     dc.SetBrush(*wxTRANSPARENT_BRUSH);
 243
 244     dc.DrawRectangle(rect);
 245
 246     dc.SetLogicalFunction(wxCOPY);
 247 #endif
 248 }
 249
 250 // draw focus background on area in a way typical on platform
 251 void
 252 wxComboCtrl::PrepareBackground( wxDC& dc, const wxRect& rect, int flags ) const
 253 {
 254     wxUxThemeHandle hTheme(this, L"COMBOBOX");
 255     //COLORREF cref;
 256
 257     wxSize sz = GetClientSize();
 258     bool isEnabled;
 259     bool isFocused; // also selected
 260
 261     // For smaller size control (and for disabled background) use less spacing
 262     int focusSpacingX;
 263     int focusSpacingY;
 264
 265     if ( !(flags & wxCONTROL_ISSUBMENU) )
 266     {
 267         // Drawing control
 268         isEnabled = IsEnabled();
 269         isFocused = ShouldDrawFocus();
 270
 271         // Windows-style: for smaller size control (and for disabled background) use less spacing
 272         if ( hTheme )
 273         {
 274             // WinXP  Theme
 275             focusSpacingX = isEnabled ? 2 : 1;
 276             focusSpacingY = sz.y > (GetCharHeight()+2) && isEnabled ? 2 : 1;
 277         }
 278         else
 279         {
 280             // Classic Theme
 281             if ( isEnabled )
 282             {
 283                 focusSpacingX = 1;
 284                 focusSpacingY = 1;
 285             }
 286             else
 287             {
 288                 focusSpacingX = 0;
 289                 focusSpacingY = 0;
 290             }
 291         }
 292     }
 293     else
 294     {
 295         // Drawing a list item
 296         isEnabled = true; // they are never disabled
 297         isFocused = flags & wxCONTROL_SELECTED ? true : false;
 298
 299         focusSpacingX = 0;
 300         focusSpacingY = 0;
 301     }
 302
 303     // Set the background sub-rectangle for selection, disabled etc
 304     wxRect selRect(rect);
 305     selRect.y += focusSpacingY;
 306     selRect.height -= (focusSpacingY*2);
 307
 308     int wcp = 0;
 309
 310     if ( !(flags & wxCONTROL_ISSUBMENU) )
 311         wcp += m_widthCustomPaint;
 312
 313     selRect.x += wcp + focusSpacingX;
 314     selRect.width -= wcp + (focusSpacingX*2);
 315
 316     //wxUxThemeEngine* theme = (wxUxThemeEngine*) NULL;
 317     //if ( hTheme )
 318     //    theme = wxUxThemeEngine::GetIfActive();
 319
 320     wxColour bgCol;
 321     bool drawDottedEdge = false;
 322
 323     if ( isEnabled )
 324     {
 325         // If popup is hidden and this control is focused,
 326         // then draw the focus-indicator (selbgcolor background etc.).
 327         if ( isFocused )
 328         {
 329         #if 0
 330             // TODO: Proper theme color getting (JMS: I don't know which parts/colors to use,
 331             //       those below don't work)
 332             if ( hTheme )
 333             {
 334                 theme->GetThemeColor(hTheme,EP_EDITTEXT,ETS_SELECTED,TMT_TEXTCOLOR,&cref);
 335                 dc.SetTextForeground( wxRGBToColour(cref) );
 336                 theme->GetThemeColor(hTheme,EP_EDITTEXT,ETS_SELECTED,TMT_FILLCOLOR,&cref);
 337                 bgCol = wxRGBToColour(cref);
 338             }
 339             else
 340         #endif
 341             {
 342                 dc.SetTextForeground( wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHTTEXT) );
 343                 bgCol = wxSystemSettings::GetColour(wxSYS_COLOUR_HIGHLIGHT);
 344                 if ( m_windowStyle & wxCB_READONLY )
 345                     drawDottedEdge = true;
 346             }
 347         }
 348         else
 349         {
 350             /*if ( hTheme )
 351             {
 352                 theme->GetThemeColor(hTheme,EP_EDITTEXT,ETS_NORMAL,TMT_TEXTCOLOR,&cref);
 353                 dc.SetTextForeground( wxRGBToColour(cref) );
 354                 theme->GetThemeColor(hTheme,EP_EDITTEXT,ETS_NORMAL,TMT_FILLCOLOR,&cref);
 355                 bgCol = wxRGBToColour(cref);
 356             }
 357             else
 358             {*/
 359                 dc.SetTextForeground( wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOWTEXT) );
 360                 bgCol = GetBackgroundColour();
 361             //}
 362         }
 363     }
 364     else
 365     {
 366         /*if ( hTheme )
 367         {
 368             theme->GetThemeColor(hTheme,EP_EDITTEXT,ETS_DISABLED,TMT_TEXTCOLOR,&cref);
 369             dc.SetTextForeground( wxRGBToColour(cref) );
 370             theme->GetThemeColor(hTheme,EP_EDITTEXT,ETS_DISABLED,TMT_EDGEFILLCOLOR,&cref);
 371             bgCol = wxRGBToColour(cref);
 372         }
 373         else
 374         {*/
 375             dc.SetTextForeground( wxSystemSettings::GetColour(wxSYS_COLOUR_GRAYTEXT) );
 376             bgCol = wxSystemSettings::GetColour(wxSYS_COLOUR_BTNFACE);
 377         //}
 378     }
 379
 380     dc.SetBrush(bgCol);
 381     dc.SetPen(bgCol);
 382     dc.DrawRectangle(selRect);
 383     if ( drawDottedEdge )
 384         wxMSWDrawFocusRect(dc,selRect);
 385
 386     // Don't clip exactly to the selection rectangle so we can draw
 387     // to the non-selected area in front of it.
 388     wxRect clipRect(rect.x,rect.y,
 389                     (selRect.x+selRect.width)-rect.x-1,rect.height);
 390     dc.SetClippingRegion(clipRect);
 391 }
 392
 393 void wxComboCtrl::OnPaintEvent( wxPaintEvent& WXUNUSED(event) )
 394 {
 395     // TODO: Convert drawing in this function to Windows API Code
 396
 397     wxSize sz = GetClientSize();
 398     wxAutoBufferedPaintDC dc(this);
 399
 400     const wxRect& rectb = m_btnArea;
 401     wxRect rect = m_tcArea;
 402     bool isEnabled = IsEnabled();
 403     wxColour bgCol = GetBackgroundColour();
 404     wxColour fgCol;
 405
 406     wxUxThemeEngine* theme = NULL;
 407     wxUxThemeHandle hTheme(this, L"COMBOBOX");
 408     int etsState;
 409
 410     // area around both controls
 411     wxRect rect2(0,0,sz.x,sz.y);
 412     if ( m_iFlags & wxCC_IFLAG_BUTTON_OUTSIDE )
 413     {
 414         rect2 = m_tcArea;
 415         rect2.Inflate(1);
 416     }
 417
 418     // Use theme to draw border on XP
 419     if ( hTheme )
 420     {
 421         theme = wxUxThemeEngine::GetIfActive();
 422         COLORREF cref;
 423
 424         // Select correct border colour
 425         if ( !isEnabled )
 426             etsState = ETS_DISABLED;
 427         else
 428             etsState = ETS_NORMAL;
 429
 430         if ( m_widthCustomBorder )
 431         {
 432             theme->GetThemeColor(hTheme,EP_EDITTEXT,etsState,TMT_BORDERCOLOR,&cref);
 433
 434             // Set border colour
 435             dc.SetPen( wxRGBToColour(cref) );
 436
 437             dc.SetBrush( *wxTRANSPARENT_BRUSH );
 438             dc.DrawRectangle(rect2);
 439         }
 440
 441         theme->GetThemeColor(hTheme,EP_EDITTEXT,etsState,TMT_TEXTCOLOR,&cref);
 442         fgCol = wxRGBToColour(cref);
 443     }
 444     else
 445     {
 446         // draw regular background
 447         fgCol = GetForegroundColour();
 448     }
 449
 450     rect2.Deflate(m_widthCustomBorder);
 451
 452     dc.SetBrush(bgCol);
 453     dc.SetPen(bgCol);
 454
 455     // clear main background
 456     dc.DrawRectangle(rect);
 457
 458     // Button background with theme?
 459     int drawButFlags = Draw_PaintBg;
 460     if ( hTheme && m_blankButtonBg )
 461     {
 462         RECT r;
 463         wxCopyRectToRECT(rectb, r);
 464
 465         // Draw parent background if needed (since button looks like its out of
 466         // the combo, this is preferred).
 467         theme->DrawThemeParentBackground(GetHwndOf(this),
 468                                          GetHdcOf(dc),
 469                                          &r);
 470
 471         drawButFlags = 0;
 472     }
 473
 474     // Standard button rendering
 475     DrawButton(dc,rectb,drawButFlags);
 476
 477     // paint required portion on the control
 478     if ( (!m_text || m_widthCustomPaint) )
 479     {
 480         wxASSERT( m_widthCustomPaint >= 0 );
 481
 482         // this is intentionally here to allow drawed rectangle's
 483         // right edge to be hidden
 484         if ( m_text )
 485             rect.width = m_widthCustomPaint;
 486
 487         dc.SetFont( GetFont() );
 488
 489         dc.SetClippingRegion(rect);
 490         if ( m_popupInterface )
 491             m_popupInterface->PaintComboControl(dc,rect);
 492         else
 493             wxComboPopup::DefaultPaintComboControl(this,dc,rect);
 494     }
 495 }
 496
 497 void wxComboCtrl::OnMouseEvent( wxMouseEvent& event )
 498 {
 499     int mx = event.m_x;
 500     bool isOnButtonArea = m_btnArea.Contains(mx,event.m_y);
 501     int handlerFlags = isOnButtonArea ? wxCC_MF_ON_BUTTON : 0;
 502
 503     if ( PreprocessMouseEvent(event,isOnButtonArea) )
 504         return;
 505
 506     if ( (m_windowStyle & (wxCC_SPECIAL_DCLICK|wxCB_READONLY)) == wxCB_READONLY )
 507     {
 508         // if no textctrl and no special double-click, then the entire control acts
 509         // as a button
 510         handlerFlags |= wxCC_MF_ON_BUTTON;
 511         if ( HandleButtonMouseEvent(event,handlerFlags) )
 512             return;
 513     }
 514     else
 515     {
 516         if ( isOnButtonArea || HasCapture() ||
 517              (m_widthCustomPaint && mx < (m_tcArea.x+m_widthCustomPaint)) )
 518         {
 519             handlerFlags |= wxCC_MF_ON_CLICK_AREA;
 520
 521             if ( HandleButtonMouseEvent(event,handlerFlags) )
 522                 return;
 523         }
 524         else if ( m_btnState )
 525         {
 526             // otherwise need to clear the hover status
 527             m_btnState = 0;
 528             RefreshRect(m_btnArea);
 529         }
 530     }
 531
 532     //
 533     // This will handle left_down and left_dclick events outside button in a Windows-like manner.
 534     // See header file for further information on this method.
 535     HandleNormalMouseEvent(event);
 536
 537 }
 538
 539 #if wxUSE_COMBOCTRL_POPUP_ANIMATION
 540 static wxUint32 GetUserPreferencesMask()
 541 {
 542     static wxUint32 userPreferencesMask = 0;
 543     static bool valueSet = false;
 544
 545     if ( valueSet )
 546         return userPreferencesMask;
 547
 548     wxRegKey* pKey = NULL;
 549     wxRegKey key1(wxRegKey::HKCU, wxT("Software\\Policies\\Microsoft\\Control Panel"));
 550     wxRegKey key2(wxRegKey::HKCU, wxT("Software\\Policies\\Microsoft\\Windows\\Control Panel"));
 551     wxRegKey key3(wxRegKey::HKCU, wxT("Control Panel\\Desktop"));
 552
 553     if ( key1.Exists() )
 554         pKey = &key1;
 555     else if ( key2.Exists() )
 556         pKey = &key2;
 557     else if ( key3.Exists() )
 558         pKey = &key3;
 559
 560     if ( pKey && pKey->Open(wxRegKey::Read) )
 561     {
 562         wxMemoryBuffer buf;
 563         if ( pKey->HasValue(wxT("UserPreferencesMask")) &&
 564              pKey->QueryValue(wxT("UserPreferencesMask"), buf) )
 565         {
 566             if ( buf.GetDataLen() >= 4 )
 567             {
 568                 wxUint32* p = (wxUint32*) buf.GetData();
 569                 userPreferencesMask = *p;
 570             }
 571         }
 572     }
 573
 574     valueSet = true;
 575
 576     return userPreferencesMask;
 577 }
 578 #endif
 579
 580 #if wxUSE_COMBOCTRL_POPUP_ANIMATION
 581 void wxComboCtrl::OnTimerEvent( wxTimerEvent& WXUNUSED(event) )
 582 {
 583     bool stopTimer = false;
 584
 585     wxWindow* popup = GetPopupControl()->GetControl();
 586
 587     // Popup was hidden before it was fully shown?
 588     if ( IsPopupWindowState(Hidden) )
 589     {
 590         stopTimer = true;
 591     }
 592     else
 593     {
 594         wxLongLong t = ::wxGetLocalTimeMillis();
 595         const wxRect& rect = m_animRect;
 596         wxWindow* win = GetPopupWindow();
 597
 598         int pos = (int) (t-m_animStart).GetLo();
 599         if ( pos < COMBOBOX_ANIMATION_DURATION )
 600         {
 601             int height = rect.height;
 602             //int h0 = rect.height;
 603             int h = (((pos*256)/COMBOBOX_ANIMATION_DURATION)*height)/256;
 604             int y = (height - h);
 605             if ( y < 0 )
 606                 y = 0;
 607
 608             if ( m_animFlags & ShowAbove )
 609             {
 610                 win->SetSize( rect.x, rect.y + height - h, rect.width, h );
 611             }
 612             else
 613             {
 614                 popup->Move( 0, -y );
 615                 win->SetSize( rect.x, rect.y, rect.width, h );
 616             }
 617         }
 618         else
 619         {
 620             stopTimer = true;
 621         }
 622     }
 623
 624     if ( stopTimer )
 625     {
 626         popup->Move( 0, 0 );
 627         m_animTimer.Stop();
 628         DoShowPopup( m_animRect, m_animFlags );
 629     }
 630 }
 631 #endif
 632
 633 #if wxUSE_COMBOCTRL_POPUP_ANIMATION
 634 bool wxComboCtrl::AnimateShow( const wxRect& rect, int flags )
 635 {
 636     if ( GetUserPreferencesMask() & wxMSW_DESKTOP_USERPREFERENCESMASK_COMBOBOXANIM )
 637     {
 638         m_animStart = ::wxGetLocalTimeMillis();
 639         m_animRect = rect;
 640         m_animFlags = flags;
 641
 642         wxWindow* win = GetPopupWindow();
 643         win->SetSize( rect.x, rect.y, rect.width, 0 );
 644         win->Show();
 645
 646         m_animTimer.SetOwner( this, wxID_ANY );
 647         m_animTimer.Start( COMBOBOX_ANIMATION_RESOLUTION, wxTIMER_CONTINUOUS );
 648
 649         OnTimerEvent(*((wxTimerEvent*)NULL));  // Event is never used, so we can give NULL
 650
 651         return false;
 652     }
 653
 654     return true;
 655 }
 656 #endif
 657
 658 wxCoord wxComboCtrl::GetNativeTextIndent() const
 659 {
 660     if ( wxUxThemeEngine::GetIfActive() )
 661         return NATIVE_TEXT_INDENT_XP;
 662     return NATIVE_TEXT_INDENT_CLASSIC;
 663 }
 664
 665 bool wxComboCtrl::IsKeyPopupToggle(const wxKeyEvent& event) const
 666 {
 667     const bool isPopupShown = IsPopupShown();
 668
 669     switch ( event.GetKeyCode() )
 670     {
 671         case WXK_F4:
 672             // F4 toggles the popup in the native comboboxes, so emulate them
 673             if ( !event.AltDown() )
 674                 return true;
 675             break;
 676
 677         case WXK_ESCAPE:
 678             if ( isPopupShown )
 679                 return true;
 680             break;
 681
 682         case WXK_DOWN:
 683         case WXK_UP:
 684             // On XP or with writable combo in Classic, arrows don't open the
 685             // popup but Alt-arrow does
 686             if ( event.AltDown() ||
 687                     ( !isPopupShown &&
 688                       HasFlag(wxCB_READONLY) &&
 689                       !wxUxThemeEngine::GetIfActive()
 690                     ) )
 691             {
 692                 return true;
 693             }
 694             break;
 695     }
 696
 697     return false;
 698 }
 699
 700 #endif // wxUSE_COMBOCTRL