src/msw/combobox.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/combobox.cpp
   3 // Purpose:     wxComboBox class
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     01/02/97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #if wxUSE_COMBOBOX
  28
  29 #include "wx/combobox.h"
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/msw/wrapcctl.h" // include <commctrl.h> "properly"
  33     #include "wx/settings.h"
  34     #include "wx/log.h"
  35     // for wxEVT_COMMAND_TEXT_ENTER
  36     #include "wx/textctrl.h"
  37     #include "wx/app.h"
  38     #include "wx/brush.h"
  39 #endif
  40
  41 #include "wx/clipbrd.h"
  42 #include "wx/wupdlock.h"
  43 #include "wx/msw/private.h"
  44
  45 #if wxUSE_UXTHEME
  46     #include "wx/msw/uxtheme.h"
  47 #endif
  48
  49 #if wxUSE_TOOLTIPS
  50     #include "wx/tooltip.h"
  51 #endif // wxUSE_TOOLTIPS
  52
  53 // ----------------------------------------------------------------------------
  54 // wxWin macros
  55 // ----------------------------------------------------------------------------
  56
  57 BEGIN_EVENT_TABLE(wxComboBox, wxControl)
  58     EVT_MENU(wxID_CUT, wxComboBox::OnCut)
  59     EVT_MENU(wxID_COPY, wxComboBox::OnCopy)
  60     EVT_MENU(wxID_PASTE, wxComboBox::OnPaste)
  61     EVT_MENU(wxID_UNDO, wxComboBox::OnUndo)
  62     EVT_MENU(wxID_REDO, wxComboBox::OnRedo)
  63     EVT_MENU(wxID_CLEAR, wxComboBox::OnDelete)
  64     EVT_MENU(wxID_SELECTALL, wxComboBox::OnSelectAll)
  65
  66     EVT_UPDATE_UI(wxID_CUT, wxComboBox::OnUpdateCut)
  67     EVT_UPDATE_UI(wxID_COPY, wxComboBox::OnUpdateCopy)
  68     EVT_UPDATE_UI(wxID_PASTE, wxComboBox::OnUpdatePaste)
  69     EVT_UPDATE_UI(wxID_UNDO, wxComboBox::OnUpdateUndo)
  70     EVT_UPDATE_UI(wxID_REDO, wxComboBox::OnUpdateRedo)
  71     EVT_UPDATE_UI(wxID_CLEAR, wxComboBox::OnUpdateDelete)
  72     EVT_UPDATE_UI(wxID_SELECTALL, wxComboBox::OnUpdateSelectAll)
  73 END_EVENT_TABLE()
  74
  75 // ----------------------------------------------------------------------------
  76 // function prototypes
  77 // ----------------------------------------------------------------------------
  78
  79 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
  80                                             UINT message,
  81                                             WPARAM wParam,
  82                                             LPARAM lParam);
  83
  84 // ---------------------------------------------------------------------------
  85 // global vars
  86 // ---------------------------------------------------------------------------
  87
  88 // the pointer to standard radio button wnd proc
  89 static WNDPROC gs_wndprocEdit = (WNDPROC)NULL;
  90
  91 // ============================================================================
  92 // implementation
  93 // ============================================================================
  94
  95 namespace
  96 {
  97
  98 // Check if the given message should be forwarded from the edit control which
  99 // is part of the combobox to wxComboBox itself. All messages generating the
 100 // events that the code using wxComboBox could be interested in must be
 101 // forwarded.
 102 bool ShouldForwardFromEditToCombo(UINT message)
 103 {
 104     switch ( message )
 105     {
 106         case WM_KEYUP:
 107         case WM_KEYDOWN:
 108         case WM_CHAR:
 109         case WM_SYSCHAR:
 110         case WM_SYSKEYDOWN:
 111         case WM_SYSKEYUP:
 112         case WM_SETFOCUS:
 113         case WM_KILLFOCUS:
 114         case WM_CUT:
 115         case WM_COPY:
 116         case WM_PASTE:
 117             return true;
 118     }
 119
 120     return false;
 121 }
 122
 123 } // anonymous namespace
 124
 125 // ----------------------------------------------------------------------------
 126 // wnd proc for subclassed edit control
 127 // ----------------------------------------------------------------------------
 128
 129 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
 130                                             UINT message,
 131                                             WPARAM wParam,
 132                                             LPARAM lParam)
 133 {
 134     HWND hwndCombo = ::GetParent(hWnd);
 135     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
 136
 137     if ( ShouldForwardFromEditToCombo(message) )
 138     {
 139         wxComboBox *combo = wxDynamicCast(win, wxComboBox);
 140         if ( !combo )
 141         {
 142             // we can get WM_KILLFOCUS while our parent is already half
 143             // destroyed and hence doesn't look like a combobx any
 144             // longer, check for it to avoid bogus assert failures
 145             if ( !win->IsBeingDeleted() )
 146             {
 147                 wxFAIL_MSG( wxT("should have combo as parent") );
 148             }
 149         }
 150         else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
 151         {
 152             // handled by parent
 153             return 0;
 154         }
 155     }
 156     else if ( message == WM_GETDLGCODE )
 157     {
 158         wxCHECK_MSG( win, 0, wxT("should have a parent") );
 159
 160         if ( win->GetWindowStyle() & wxTE_PROCESS_ENTER )
 161         {
 162             // need to return a custom dlg code or we'll never get it
 163             return DLGC_WANTMESSAGE;
 164         }
 165     }
 166
 167     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 168 }
 169
 170 // ----------------------------------------------------------------------------
 171 // wxComboBox callbacks
 172 // ----------------------------------------------------------------------------
 173
 174 WXLRESULT wxComboBox::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 175 {
 176     // TODO: handle WM_CTLCOLOR messages from our EDIT control to be able to
 177     //       set its colour correctly (to be the same as our own one)
 178
 179     switch ( nMsg )
 180     {
 181         case WM_SIZE:
 182         // wxStaticBox can generate this message, when modifying the control's style.
 183         // This causes the content of the combobox to be selected, for some reason.
 184         case WM_STYLECHANGED:
 185             {
 186                 // combobox selection sometimes spontaneously changes when its
 187                 // size changes, restore it to the old value if necessary
 188                 if ( !GetEditHWNDIfAvailable() )
 189                     break;
 190
 191                 long fromOld, toOld;
 192                 GetSelection(&fromOld, &toOld);
 193
 194                 // if an editable combobox has a not empty text not from the
 195                 // list, it tries to autocomplete it from the list when it is
 196                 // resized, but we don't want this to happen as it doesn't seem
 197                 // to make any sense, so we forcefully restore the old text
 198                 wxString textOld;
 199                 if ( !HasFlag(wxCB_READONLY) && GetCurrentSelection() == -1 )
 200                     textOld = GetValue();
 201
 202                 // eliminate flickering during following hacks
 203                 wxWindowUpdateLocker lock(this);
 204
 205                 WXLRESULT result = wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 206
 207                 if ( !textOld.empty() && GetValue() != textOld )
 208                     SetLabel(textOld);
 209
 210                 long fromNew, toNew;
 211                 GetSelection(&fromNew, &toNew);
 212
 213                 if ( fromOld != fromNew || toOld != toNew )
 214                 {
 215                     SetSelection(fromOld, toOld);
 216                 }
 217
 218                 return result;
 219             }
 220     }
 221
 222     return wxChoice::MSWWindowProc(nMsg, wParam, lParam);
 223 }
 224
 225 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 226 {
 227     switch ( msg )
 228     {
 229         case WM_CHAR:
 230             // for compatibility with wxTextCtrl, generate a special message
 231             // when Enter is pressed
 232             if ( wParam == VK_RETURN )
 233             {
 234                 if (SendMessage(GetHwnd(), CB_GETDROPPEDSTATE, 0, 0))
 235                     return false;
 236
 237                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 238
 239                 const int sel = GetSelection();
 240                 event.SetInt(sel);
 241                 event.SetString(GetValue());
 242                 InitCommandEventWithItems(event, sel);
 243
 244                 if ( ProcessCommand(event) )
 245                 {
 246                     // don't let the event through to the native control
 247                     // because it doesn't need it and may generate an annoying
 248                     // beep if it gets it
 249                     return true;
 250                 }
 251             }
 252             // fall through, WM_CHAR is one of the message we should forward.
 253
 254         default:
 255             if ( ShouldForwardFromEditToCombo(msg) )
 256             {
 257                 // For all the messages forward from the edit control the
 258                 // result is not used.
 259                 WXLRESULT result;
 260                 return MSWHandleMessage(&result, msg, wParam, lParam);
 261             }
 262     }
 263
 264     return false;
 265 }
 266
 267 bool wxComboBox::MSWCommand(WXUINT param, WXWORD id)
 268 {
 269     int sel = -1;
 270     wxString value;
 271
 272     switch ( param )
 273     {
 274         case CBN_DROPDOWN:
 275             // remember the last selection, just as wxChoice does
 276             m_lastAcceptedSelection = GetCurrentSelection();
 277             if ( m_lastAcceptedSelection == -1 )
 278             {
 279                 // but unlike with wxChoice we may have no selection but still
 280                 // have some text and we should avoid erasing it if the drop
 281                 // down is cancelled (see #8474)
 282                 m_lastAcceptedSelection = wxID_NONE;
 283             }
 284             {
 285                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_DROPDOWN, GetId());
 286                 event.SetEventObject(this);
 287                 ProcessCommand(event);
 288             }
 289             break;
 290         case CBN_CLOSEUP:
 291             {
 292                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_CLOSEUP, GetId());
 293                 event.SetEventObject(this);
 294                 ProcessCommand(event);
 295             }
 296             break;
 297         case CBN_SELENDOK:
 298 #ifndef __SMARTPHONE__
 299             // we need to reset this to prevent the selection from being undone
 300             // by wxChoice, see wxChoice::MSWCommand() and comments there
 301             m_lastAcceptedSelection = wxID_NONE;
 302 #endif
 303
 304             // set these variables so that they could be also fixed in
 305             // CBN_EDITCHANGE below
 306             sel = GetSelection();
 307             value = GetStringSelection();
 308
 309             // this string is going to become the new combobox value soon but
 310             // we need it to be done right now, otherwise the event handler
 311             // could get a wrong value when it calls our GetValue()
 312             ::SetWindowText(GetHwnd(), value.t_str());
 313
 314             {
 315                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 316                 event.SetInt(sel);
 317                 event.SetString(value);
 318                 InitCommandEventWithItems(event, sel);
 319
 320                 ProcessCommand(event);
 321             }
 322
 323             // fall through: for compability with wxGTK, also send the text
 324             // update event when the selection changes (this also seems more
 325             // logical as the text does change)
 326
 327         case CBN_EDITCHANGE:
 328             if ( m_allowTextEvents )
 329             {
 330                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 331
 332                 // if sel != -1, value was already initialized above
 333                 if ( sel == -1 )
 334                 {
 335                     value = wxGetWindowText(GetHwnd());
 336                 }
 337
 338                 event.SetString(value);
 339                 InitCommandEventWithItems(event, sel);
 340
 341                 ProcessCommand(event);
 342             }
 343             break;
 344
 345         default:
 346             return wxChoice::MSWCommand(param, id);
 347     }
 348
 349     // skip wxChoice version as it would generate its own events for
 350     // CBN_SELENDOK and also interfere with our handling of CBN_DROPDOWN
 351     return true;
 352 }
 353
 354 bool wxComboBox::MSWShouldPreProcessMessage(WXMSG *pMsg)
 355 {
 356     // prevent command accelerators from stealing editing
 357     // hotkeys when we have the focus
 358     if (wxIsCtrlDown())
 359     {
 360         WPARAM vkey = pMsg->wParam;
 361
 362         switch (vkey)
 363         {
 364             case 'C':
 365             case 'V':
 366             case 'X':
 367             case VK_INSERT:
 368             case VK_DELETE:
 369             case VK_HOME:
 370             case VK_END:
 371                 return false;
 372         }
 373     }
 374
 375     return wxChoice::MSWShouldPreProcessMessage(pMsg);
 376 }
 377
 378 WXHWND wxComboBox::GetEditHWNDIfAvailable() const
 379 {
 380     WinStruct<COMBOBOXINFO> info;
 381     if ( MSWGetComboBoxInfo(&info) )
 382         return info.hwndItem;
 383
 384     if (HasFlag(wxCB_SIMPLE))
 385     {
 386         POINT pt;
 387         pt.x = pt.y = 4;
 388         return (WXHWND) ::ChildWindowFromPoint(GetHwnd(), pt);
 389     }
 390
 391     // notice that a slightly safer alternative could be to use FindWindowEx()
 392     // but it's not available under WinCE so just take the first child for now
 393     // to keep one version of the code for all platforms and fix it later if
 394     // problems are discovered
 395
 396     // we assume that the only child of the combobox is the edit window
 397     return (WXHWND)::GetWindow(GetHwnd(), GW_CHILD);
 398 }
 399
 400 WXHWND wxComboBox::GetEditHWND() const
 401 {
 402     // this function should not be called for wxCB_READONLY controls, it is
 403     // the callers responsibility to check this
 404     wxASSERT_MSG( !HasFlag(wxCB_READONLY),
 405                   wxT("read-only combobox doesn't have any edit control") );
 406
 407     WXHWND hWndEdit = GetEditHWNDIfAvailable();
 408     wxASSERT_MSG( hWndEdit, wxT("combobox without edit control?") );
 409
 410     return hWndEdit;
 411 }
 412
 413 wxWindow *wxComboBox::GetEditableWindow()
 414 {
 415     wxASSERT_MSG( !HasFlag(wxCB_READONLY),
 416                   wxT("read-only combobox doesn't have any edit control") );
 417
 418     return this;
 419 }
 420
 421 // ----------------------------------------------------------------------------
 422 // wxComboBox creation
 423 // ----------------------------------------------------------------------------
 424
 425 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 426                         const wxString& value,
 427                         const wxPoint& pos,
 428                         const wxSize& size,
 429                         int n, const wxString choices[],
 430                         long style,
 431                         const wxValidator& validator,
 432                         const wxString& name)
 433 {
 434     // pretend that wxComboBox is hidden while it is positioned and resized and
 435     // show it only right before leaving this method because otherwise there is
 436     // some noticeable flicker while the control rearranges itself
 437     m_isShown = false;
 438
 439     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 440                         validator, name) )
 441         return false;
 442
 443     // we shouldn't call SetValue() for an empty string because this would
 444     // (correctly) result in an assert with a read only combobox and is useless
 445     // for the other ones anyhow
 446     if ( !value.empty() )
 447         SetValue(value);
 448
 449     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 450     // and an edit control inside it and if we want to catch events from this
 451     // edit control, we must subclass it as well
 452     if ( !(style & wxCB_READONLY) )
 453     {
 454         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(), wxComboEditWndProc);
 455     }
 456
 457     // and finally, show the control
 458     Show(true);
 459
 460     return true;
 461 }
 462
 463 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 464                         const wxString& value,
 465                         const wxPoint& pos,
 466                         const wxSize& size,
 467                         const wxArrayString& choices,
 468                         long style,
 469                         const wxValidator& validator,
 470                         const wxString& name)
 471 {
 472     wxCArrayString chs(choices);
 473     return Create(parent, id, value, pos, size, chs.GetCount(),
 474                   chs.GetStrings(), style, validator, name);
 475 }
 476
 477 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 478 {
 479     // we never have an external border
 480     WXDWORD msStyle = wxChoice::MSWGetStyle
 481                       (
 482                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 483                       );
 484
 485     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 486     // created hidden (see Create() above), it is not done for us but we still
 487     // want to have this style
 488     msStyle |= WS_TABSTOP;
 489
 490     // remove the style always added by wxChoice
 491     msStyle &= ~CBS_DROPDOWNLIST;
 492
 493     if ( style & wxCB_READONLY )
 494         msStyle |= CBS_DROPDOWNLIST;
 495 #ifndef __WXWINCE__
 496     else if ( style & wxCB_SIMPLE )
 497         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 498 #endif
 499     else
 500         msStyle |= CBS_DROPDOWN;
 501
 502     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 503     msStyle |= CBS_AUTOHSCROLL;
 504
 505     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 506
 507     return msStyle;
 508 }
 509
 510 // ----------------------------------------------------------------------------
 511 // wxComboBox text control-like methods
 512 // ----------------------------------------------------------------------------
 513
 514 wxString wxComboBox::GetValue() const
 515 {
 516     return HasFlag(wxCB_READONLY) ? GetStringSelection()
 517                                   : wxTextEntry::GetValue();
 518 }
 519
 520 void wxComboBox::SetValue(const wxString& value)
 521 {
 522     if ( HasFlag(wxCB_READONLY) )
 523         SetStringSelection(value);
 524     else
 525         wxTextEntry::SetValue(value);
 526 }
 527
 528 void wxComboBox::Clear()
 529 {
 530     wxChoice::Clear();
 531     if ( !HasFlag(wxCB_READONLY) )
 532         wxTextEntry::Clear();
 533 }
 534
 535 bool wxComboBox::ContainsHWND(WXHWND hWnd) const
 536 {
 537     return hWnd == GetEditHWNDIfAvailable();
 538 }
 539
 540 void wxComboBox::GetSelection(long *from, long *to) const
 541 {
 542     if ( !HasFlag(wxCB_READONLY) )
 543     {
 544         wxTextEntry::GetSelection(from, to);
 545     }
 546     else // text selection doesn't make sense for read only comboboxes
 547     {
 548         if ( from )
 549             *from = -1;
 550         if ( to )
 551             *to = -1;
 552     }
 553 }
 554
 555 bool wxComboBox::IsEditable() const
 556 {
 557     return !HasFlag(wxCB_READONLY) && wxTextEntry::IsEditable();
 558 }
 559
 560 // ----------------------------------------------------------------------------
 561 // standard event handling
 562 // ----------------------------------------------------------------------------
 563
 564 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 565 {
 566     Cut();
 567 }
 568
 569 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 570 {
 571     Copy();
 572 }
 573
 574 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 575 {
 576     Paste();
 577 }
 578
 579 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 580 {
 581     Undo();
 582 }
 583
 584 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 585 {
 586     Redo();
 587 }
 588
 589 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 590 {
 591     RemoveSelection();
 592 }
 593
 594 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 595 {
 596     SelectAll();
 597 }
 598
 599 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 600 {
 601     event.Enable( CanCut() );
 602 }
 603
 604 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 605 {
 606     event.Enable( CanCopy() );
 607 }
 608
 609 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 610 {
 611     event.Enable( CanPaste() );
 612 }
 613
 614 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 615 {
 616     event.Enable( IsEditable() && CanUndo() );
 617 }
 618
 619 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 620 {
 621     event.Enable( IsEditable() && CanRedo() );
 622 }
 623
 624 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 625 {
 626     event.Enable(IsEditable() && HasSelection());
 627 }
 628
 629 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 630 {
 631     event.Enable(IsEditable() && !wxTextEntry::IsEmpty());
 632 }
 633
 634 #if wxUSE_TOOLTIPS
 635
 636 void wxComboBox::DoSetToolTip(wxToolTip *tip)
 637 {
 638     wxChoice::DoSetToolTip(tip);
 639
 640     if ( tip && !HasFlag(wxCB_READONLY) )
 641         tip->AddOtherWindow(GetEditHWND());
 642 }
 643
 644 #endif // wxUSE_TOOLTIPS
 645
 646 #if wxUSE_UXTHEME
 647
 648 bool wxComboBox::SetHint(const wxString& hintOrig)
 649 {
 650     wxString hint(hintOrig);
 651     if ( wxUxThemeEngine::GetIfActive() )
 652     {
 653         // under XP (but not Vista) there is a bug in cue banners
 654         // implementation for combobox edit control: the first character is
 655         // partially chopped off, so prepend a space to make it fully visible
 656         hint.insert(0, " ");
 657     }
 658
 659     return wxTextEntry::SetHint(hint);
 660 }
 661
 662 #endif // wxUSE_UXTHEME
 663
 664 wxSize wxComboBox::DoGetSizeFromTextSize(int xlen, int ylen) const
 665 {
 666     wxSize tsize( wxChoice::DoGetSizeFromTextSize(xlen, ylen) );
 667
 668     if ( !HasFlag(wxCB_READONLY) )
 669     {
 670         // Add the margins we have previously set
 671         wxPoint marg( GetMargins() );
 672         marg.x = wxMax(0, marg.x);
 673         marg.y = wxMax(0, marg.y);
 674         tsize.IncBy( marg );
 675     }
 676
 677     return tsize;
 678 }
 679
 680 #endif // wxUSE_COMBOBOX