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_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_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             {
 278                 wxCommandEvent event(wxEVT_COMBOBOX_DROPDOWN, GetId());
 279                 event.SetEventObject(this);
 280                 ProcessCommand(event);
 281             }
 282             break;
 283
 284         case CBN_CLOSEUP:
 285             // Do the same thing as in wxChoice but using different event type.
 286             if ( m_pendingSelection != wxID_NONE )
 287             {
 288                 SendSelectionChangedEvent(wxEVT_COMBOBOX);
 289                 m_pendingSelection = wxID_NONE;
 290             }
 291             {
 292                 wxCommandEvent event(wxEVT_COMBOBOX_CLOSEUP, GetId());
 293                 event.SetEventObject(this);
 294                 ProcessCommand(event);
 295             }
 296             break;
 297
 298         case CBN_SELENDOK:
 299 #ifndef __SMARTPHONE__
 300             // we need to reset this to prevent the selection from being undone
 301             // by wxChoice, see wxChoice::MSWCommand() and comments there
 302             m_lastAcceptedSelection = wxID_NONE;
 303 #endif
 304
 305             // set these variables so that they could be also fixed in
 306             // CBN_EDITCHANGE below
 307             sel = GetSelection();
 308             value = GetStringSelection();
 309
 310             // this string is going to become the new combobox value soon but
 311             // we need it to be done right now, otherwise the event handler
 312             // could get a wrong value when it calls our GetValue()
 313             ::SetWindowText(GetHwnd(), value.t_str());
 314
 315             SendSelectionChangedEvent(wxEVT_COMBOBOX);
 316
 317             // fall through: for compatibility with wxGTK, also send the text
 318             // update event when the selection changes (this also seems more
 319             // logical as the text does change)
 320
 321         case CBN_EDITCHANGE:
 322             if ( m_allowTextEvents )
 323             {
 324                 wxCommandEvent event(wxEVT_TEXT, GetId());
 325
 326                 // if sel != -1, value was already initialized above
 327                 if ( sel == -1 )
 328                 {
 329                     value = wxGetWindowText(GetHwnd());
 330                 }
 331
 332                 event.SetString(value);
 333                 InitCommandEventWithItems(event, sel);
 334
 335                 ProcessCommand(event);
 336             }
 337             break;
 338
 339         default:
 340             return wxChoice::MSWCommand(param, id);
 341     }
 342
 343     // skip wxChoice version as it would generate its own events for
 344     // CBN_SELENDOK and also interfere with our handling of CBN_DROPDOWN
 345     return true;
 346 }
 347
 348 bool wxComboBox::MSWShouldPreProcessMessage(WXMSG *pMsg)
 349 {
 350     // prevent command accelerators from stealing editing
 351     // hotkeys when we have the focus
 352     if (wxIsCtrlDown())
 353     {
 354         WPARAM vkey = pMsg->wParam;
 355
 356         switch (vkey)
 357         {
 358             case 'C':
 359             case 'V':
 360             case 'X':
 361             case VK_INSERT:
 362             case VK_DELETE:
 363             case VK_HOME:
 364             case VK_END:
 365                 return false;
 366         }
 367     }
 368
 369     return wxChoice::MSWShouldPreProcessMessage(pMsg);
 370 }
 371
 372 WXHWND wxComboBox::GetEditHWNDIfAvailable() const
 373 {
 374     // FIXME-VC6: Only VC6 needs this guard, see WINVER definition in
 375     //            include/wx/msw/wrapwin.h
 376 #if defined(WINVER) && WINVER >= 0x0500
 377     WinStruct<COMBOBOXINFO> info;
 378     if ( MSWGetComboBoxInfo(&info) )
 379         return info.hwndItem;
 380 #endif // WINVER >= 0x0500
 381
 382     if (HasFlag(wxCB_SIMPLE))
 383     {
 384         POINT pt;
 385         pt.x = pt.y = 4;
 386         return (WXHWND) ::ChildWindowFromPoint(GetHwnd(), pt);
 387     }
 388
 389     // notice that a slightly safer alternative could be to use FindWindowEx()
 390     // but it's not available under WinCE so just take the first child for now
 391     // to keep one version of the code for all platforms and fix it later if
 392     // problems are discovered
 393
 394     // we assume that the only child of the combobox is the edit window
 395     return (WXHWND)::GetWindow(GetHwnd(), GW_CHILD);
 396 }
 397
 398 WXHWND wxComboBox::GetEditHWND() const
 399 {
 400     // this function should not be called for wxCB_READONLY controls, it is
 401     // the callers responsibility to check this
 402     wxASSERT_MSG( !HasFlag(wxCB_READONLY),
 403                   wxT("read-only combobox doesn't have any edit control") );
 404
 405     WXHWND hWndEdit = GetEditHWNDIfAvailable();
 406     wxASSERT_MSG( hWndEdit, wxT("combobox without edit control?") );
 407
 408     return hWndEdit;
 409 }
 410
 411 wxWindow *wxComboBox::GetEditableWindow()
 412 {
 413     wxASSERT_MSG( !HasFlag(wxCB_READONLY),
 414                   wxT("read-only combobox doesn't have any edit control") );
 415
 416     return this;
 417 }
 418
 419 // ----------------------------------------------------------------------------
 420 // wxComboBox creation
 421 // ----------------------------------------------------------------------------
 422
 423 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 424                         const wxString& value,
 425                         const wxPoint& pos,
 426                         const wxSize& size,
 427                         int n, const wxString choices[],
 428                         long style,
 429                         const wxValidator& validator,
 430                         const wxString& name)
 431 {
 432     // pretend that wxComboBox is hidden while it is positioned and resized and
 433     // show it only right before leaving this method because otherwise there is
 434     // some noticeable flicker while the control rearranges itself
 435     m_isShown = false;
 436
 437     if ( !CreateAndInit(parent, id, pos, size, n, choices, style,
 438                         validator, name) )
 439         return false;
 440
 441     // we shouldn't call SetValue() for an empty string because this would
 442     // (correctly) result in an assert with a read only combobox and is useless
 443     // for the other ones anyhow
 444     if ( !value.empty() )
 445         SetValue(value);
 446
 447     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 448     // and an edit control inside it and if we want to catch events from this
 449     // edit control, we must subclass it as well
 450     if ( !(style & wxCB_READONLY) )
 451     {
 452         gs_wndprocEdit = wxSetWindowProc((HWND)GetEditHWND(), wxComboEditWndProc);
 453     }
 454
 455     // and finally, show the control
 456     Show(true);
 457
 458     return true;
 459 }
 460
 461 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 462                         const wxString& value,
 463                         const wxPoint& pos,
 464                         const wxSize& size,
 465                         const wxArrayString& choices,
 466                         long style,
 467                         const wxValidator& validator,
 468                         const wxString& name)
 469 {
 470     wxCArrayString chs(choices);
 471     return Create(parent, id, value, pos, size, chs.GetCount(),
 472                   chs.GetStrings(), style, validator, name);
 473 }
 474
 475 WXDWORD wxComboBox::MSWGetStyle(long style, WXDWORD *exstyle) const
 476 {
 477     // we never have an external border
 478     WXDWORD msStyle = wxChoice::MSWGetStyle
 479                       (
 480                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 481                       );
 482
 483     // usually WS_TABSTOP is added by wxControl::MSWGetStyle() but as we're
 484     // created hidden (see Create() above), it is not done for us but we still
 485     // want to have this style
 486     msStyle |= WS_TABSTOP;
 487
 488     // remove the style always added by wxChoice
 489     msStyle &= ~CBS_DROPDOWNLIST;
 490
 491     if ( style & wxCB_READONLY )
 492         msStyle |= CBS_DROPDOWNLIST;
 493 #ifndef __WXWINCE__
 494     else if ( style & wxCB_SIMPLE )
 495         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 496 #endif
 497     else
 498         msStyle |= CBS_DROPDOWN;
 499
 500     // there is no reason to not always use CBS_AUTOHSCROLL, so do use it
 501     msStyle |= CBS_AUTOHSCROLL;
 502
 503     // NB: we used to also add CBS_NOINTEGRALHEIGHT here but why?
 504
 505     return msStyle;
 506 }
 507
 508 // ----------------------------------------------------------------------------
 509 // wxComboBox text control-like methods
 510 // ----------------------------------------------------------------------------
 511
 512 wxString wxComboBox::GetValue() const
 513 {
 514     return HasFlag(wxCB_READONLY) ? GetStringSelection()
 515                                   : wxTextEntry::GetValue();
 516 }
 517
 518 void wxComboBox::SetValue(const wxString& value)
 519 {
 520     if ( HasFlag(wxCB_READONLY) )
 521         SetStringSelection(value);
 522     else
 523         wxTextEntry::SetValue(value);
 524 }
 525
 526 void wxComboBox::Clear()
 527 {
 528     wxChoice::Clear();
 529     if ( !HasFlag(wxCB_READONLY) )
 530         wxTextEntry::Clear();
 531 }
 532
 533 bool wxComboBox::ContainsHWND(WXHWND hWnd) const
 534 {
 535     return hWnd == GetEditHWNDIfAvailable();
 536 }
 537
 538 void wxComboBox::GetSelection(long *from, long *to) const
 539 {
 540     if ( !HasFlag(wxCB_READONLY) )
 541     {
 542         wxTextEntry::GetSelection(from, to);
 543     }
 544     else // text selection doesn't make sense for read only comboboxes
 545     {
 546         if ( from )
 547             *from = -1;
 548         if ( to )
 549             *to = -1;
 550     }
 551 }
 552
 553 bool wxComboBox::IsEditable() const
 554 {
 555     return !HasFlag(wxCB_READONLY) && wxTextEntry::IsEditable();
 556 }
 557
 558 // ----------------------------------------------------------------------------
 559 // standard event handling
 560 // ----------------------------------------------------------------------------
 561
 562 void wxComboBox::OnCut(wxCommandEvent& WXUNUSED(event))
 563 {
 564     Cut();
 565 }
 566
 567 void wxComboBox::OnCopy(wxCommandEvent& WXUNUSED(event))
 568 {
 569     Copy();
 570 }
 571
 572 void wxComboBox::OnPaste(wxCommandEvent& WXUNUSED(event))
 573 {
 574     Paste();
 575 }
 576
 577 void wxComboBox::OnUndo(wxCommandEvent& WXUNUSED(event))
 578 {
 579     Undo();
 580 }
 581
 582 void wxComboBox::OnRedo(wxCommandEvent& WXUNUSED(event))
 583 {
 584     Redo();
 585 }
 586
 587 void wxComboBox::OnDelete(wxCommandEvent& WXUNUSED(event))
 588 {
 589     RemoveSelection();
 590 }
 591
 592 void wxComboBox::OnSelectAll(wxCommandEvent& WXUNUSED(event))
 593 {
 594     SelectAll();
 595 }
 596
 597 void wxComboBox::OnUpdateCut(wxUpdateUIEvent& event)
 598 {
 599     event.Enable( CanCut() );
 600 }
 601
 602 void wxComboBox::OnUpdateCopy(wxUpdateUIEvent& event)
 603 {
 604     event.Enable( CanCopy() );
 605 }
 606
 607 void wxComboBox::OnUpdatePaste(wxUpdateUIEvent& event)
 608 {
 609     event.Enable( CanPaste() );
 610 }
 611
 612 void wxComboBox::OnUpdateUndo(wxUpdateUIEvent& event)
 613 {
 614     event.Enable( IsEditable() && CanUndo() );
 615 }
 616
 617 void wxComboBox::OnUpdateRedo(wxUpdateUIEvent& event)
 618 {
 619     event.Enable( IsEditable() && CanRedo() );
 620 }
 621
 622 void wxComboBox::OnUpdateDelete(wxUpdateUIEvent& event)
 623 {
 624     event.Enable(IsEditable() && HasSelection());
 625 }
 626
 627 void wxComboBox::OnUpdateSelectAll(wxUpdateUIEvent& event)
 628 {
 629     event.Enable(IsEditable() && !wxTextEntry::IsEmpty());
 630 }
 631
 632 #if wxUSE_TOOLTIPS
 633
 634 void wxComboBox::DoSetToolTip(wxToolTip *tip)
 635 {
 636     wxChoice::DoSetToolTip(tip);
 637
 638     if ( tip && !HasFlag(wxCB_READONLY) )
 639         tip->AddOtherWindow(GetEditHWND());
 640 }
 641
 642 #endif // wxUSE_TOOLTIPS
 643
 644 #if wxUSE_UXTHEME
 645
 646 bool wxComboBox::SetHint(const wxString& hintOrig)
 647 {
 648     wxString hint(hintOrig);
 649     if ( wxUxThemeEngine::GetIfActive() )
 650     {
 651         // under XP (but not Vista) there is a bug in cue banners
 652         // implementation for combobox edit control: the first character is
 653         // partially chopped off, so prepend a space to make it fully visible
 654         hint.insert(0, " ");
 655     }
 656
 657     return wxTextEntry::SetHint(hint);
 658 }
 659
 660 #endif // wxUSE_UXTHEME
 661
 662 wxSize wxComboBox::DoGetSizeFromTextSize(int xlen, int ylen) const
 663 {
 664     wxSize tsize( wxChoice::DoGetSizeFromTextSize(xlen, ylen) );
 665
 666     if ( !HasFlag(wxCB_READONLY) )
 667     {
 668         // Add the margins we have previously set
 669         wxPoint marg( GetMargins() );
 670         marg.x = wxMax(0, marg.x);
 671         marg.y = wxMax(0, marg.y);
 672         tsize.IncBy( marg );
 673     }
 674
 675     return tsize;
 676 }
 677
 678 #endif // wxUSE_COMBOBOX