src/msw/combobox.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifdef __GNUG__
  21 #pragma implementation "combobox.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28     #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_COMBOBOX
  32
  33 #ifndef WX_PRECOMP
  34     #include "wx/settings.h"
  35     #include "wx/log.h"
  36     // for wxEVT_COMMAND_TEXT_ENTER
  37     #include "wx/textctrl.h"
  38 #endif
  39
  40 #include "wx/combobox.h"
  41 #include "wx/brush.h"
  42 #include "wx/clipbrd.h"
  43 #include "wx/msw/private.h"
  44
  45 #if wxUSE_TOOLTIPS
  46     #if !defined(__GNUWIN32_OLD__) || defined(__CYGWIN10__)
  47         #include <commctrl.h>
  48     #endif
  49     #include "wx/tooltip.h"
  50 #endif // wxUSE_TOOLTIPS
  51
  52 // ----------------------------------------------------------------------------
  53 // wxWin macros
  54 // ----------------------------------------------------------------------------
  55
  56 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)
  57
  58 // ----------------------------------------------------------------------------
  59 // function prototypes
  60 // ----------------------------------------------------------------------------
  61
  62 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
  63                                             UINT message,
  64                                             WPARAM wParam,
  65                                             LPARAM lParam);
  66
  67 // ---------------------------------------------------------------------------
  68 // global vars
  69 // ---------------------------------------------------------------------------
  70
  71 // the pointer to standard radio button wnd proc
  72 static WXFARPROC gs_wndprocEdit = (WXFARPROC)NULL;
  73
  74 // ============================================================================
  75 // implementation
  76 // ============================================================================
  77
  78 // ----------------------------------------------------------------------------
  79 // wnd proc for subclassed edit control
  80 // ----------------------------------------------------------------------------
  81
  82 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
  83                                             UINT message,
  84                                             WPARAM wParam,
  85                                             LPARAM lParam)
  86 {
  87     HWND hwndCombo = ::GetParent(hWnd);
  88     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
  89
  90     switch ( message )
  91     {
  92         // forward some messages to the combobox to generate the appropriate
  93         // wxEvents from them
  94         case WM_KEYUP:
  95         case WM_KEYDOWN:
  96         case WM_CHAR:
  97         case WM_SETFOCUS:
  98         case WM_KILLFOCUS:
  99             {
 100                 wxComboBox *combo = wxDynamicCast(win, wxComboBox);
 101                 if ( !combo )
 102                 {
 103                     // we can get WM_KILLFOCUS while our parent is already half
 104                     // destroyed and hence doesn't look like a combobx any
 105                     // longer, check for it to avoid bogus assert failures
 106                     if ( !win->IsBeingDeleted() )
 107                     {
 108                         wxFAIL_MSG( _T("should have combo as parent") );
 109                     }
 110                 }
 111                 else if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
 112                 {
 113                     // handled by parent
 114                     return 0;
 115                 }
 116             }
 117             break;
 118
 119         case WM_GETDLGCODE:
 120             {
 121                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 122
 123                 if ( win->GetWindowStyle() & wxPROCESS_ENTER )
 124                 {
 125                     // need to return a custom dlg code or we'll never get it
 126                     return DLGC_WANTMESSAGE;
 127                 }
 128             }
 129             break;
 130
 131         // deal with tooltips here
 132 #if wxUSE_TOOLTIPS && defined(TTN_NEEDTEXT)
 133         case WM_NOTIFY:
 134             {
 135                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 136
 137                 NMHDR* hdr = (NMHDR *)lParam;
 138                 if ( hdr->code == TTN_NEEDTEXT )
 139                 {
 140                     wxToolTip *tooltip = win->GetToolTip();
 141                     if ( tooltip )
 142                     {
 143                         TOOLTIPTEXT *ttt = (TOOLTIPTEXT *)lParam;
 144                         ttt->lpszText = (wxChar *)tooltip->GetTip().c_str();
 145                     }
 146
 147                     // processed
 148                     return 0;
 149                 }
 150             }
 151             break;
 152 #endif // wxUSE_TOOLTIPS
 153     }
 154
 155     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 156 }
 157
 158 WXHBRUSH wxComboBox::OnCtlColor(WXHDC pDC, WXHWND WXUNUSED(pWnd), WXUINT WXUNUSED(nCtlColor),
 159                                WXUINT WXUNUSED(message),
 160                                WXWPARAM WXUNUSED(wParam),
 161                                WXLPARAM WXUNUSED(lParam)
 162     )
 163 {
 164     HDC hdc = (HDC)pDC;
 165     wxColour colBack = GetBackgroundColour();
 166
 167     if (!IsEnabled())
 168         colBack = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
 169
 170     ::SetBkColor(hdc, wxColourToRGB(colBack));
 171     ::SetTextColor(hdc, wxColourToRGB(GetForegroundColour()));
 172
 173     wxBrush *brush = wxTheBrushList->FindOrCreateBrush(colBack, wxSOLID);
 174
 175     return (WXHBRUSH)brush->GetResourceHandle();
 176 }
 177
 178 // ----------------------------------------------------------------------------
 179 // wxComboBox
 180 // ----------------------------------------------------------------------------
 181
 182 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 183 {
 184     switch ( msg )
 185     {
 186         case WM_CHAR:
 187             // for compatibility with wxTextCtrl, generate a special message
 188             // when Enter is pressed
 189             if ( wParam == VK_RETURN )
 190             {
 191                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 192                 InitCommandEvent(event);
 193                 event.SetString(GetValue());
 194                 event.SetInt(GetSelection());
 195                 ProcessCommand(event);
 196             }
 197
 198             return HandleChar(wParam, lParam, TRUE /* isASCII */);
 199
 200         case WM_KEYDOWN:
 201             return HandleKeyDown(wParam, lParam);
 202
 203         case WM_KEYUP:
 204             return HandleKeyUp(wParam, lParam);
 205
 206         case WM_SETFOCUS:
 207             return HandleSetFocus((WXHWND)wParam);
 208
 209         case WM_KILLFOCUS:
 210             return HandleKillFocus((WXHWND)wParam);
 211     }
 212
 213     return FALSE;
 214 }
 215
 216 bool wxComboBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 217 {
 218     wxString value;
 219     int sel = -1;
 220     switch ( param )
 221     {
 222         case CBN_SELCHANGE:
 223             sel = GetSelection();
 224             if ( sel > -1 )
 225             {
 226                 value = GetString(sel);
 227
 228                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 229                 event.SetInt(sel);
 230                 event.SetEventObject(this);
 231                 event.SetString(value);
 232                 ProcessCommand(event);
 233             }
 234             else
 235             {
 236                 break;
 237             }
 238
 239             // fall through: for compability with wxGTK, also send the text
 240             // update event when the selection changes (this also seems more
 241             // logical as the text does change)
 242
 243         case CBN_EDITCHANGE:
 244             {
 245                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 246
 247                 // if sel != -1, value was initialized above (and we can't use
 248                 // GetValue() here as it would return the old selection and we
 249                 // want the new one)
 250                 if ( sel == -1 )
 251                 {
 252                     value = GetValue();
 253                 }
 254                 else // we're synthesizing text updated event from sel change
 255                 {
 256                     // we need to do this because the user code expects
 257                     // wxComboBox::GetValue() to return the new value from
 258                     // "text updated" handler but it hadn't been updated yet
 259                     SetValue(value);
 260                 }
 261
 262                 event.SetString(value);
 263                 event.SetEventObject(this);
 264                 ProcessCommand(event);
 265             }
 266             break;
 267     }
 268
 269     // there is no return value for the CBN_ notifications, so always return
 270     // FALSE from here to pass the message to DefWindowProc()
 271     return FALSE;
 272 }
 273
 274 WXHWND wxComboBox::GetEditHWND() const
 275 {
 276     // this function should not be called for wxCB_READONLY controls, it is
 277     // the callers responsability to check this
 278     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 279                   _T("read-only combobox doesn't have any edit control") );
 280
 281     POINT pt;
 282     pt.x = pt.y = 4;
 283     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 284     if ( !hwndEdit || hwndEdit == GetHwnd() )
 285     {
 286         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 287     }
 288
 289     return (WXHWND)hwndEdit;
 290 }
 291
 292 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 293                         const wxString& value,
 294                         const wxPoint& pos,
 295                         const wxSize& size,
 296                         int n, const wxString choices[],
 297                         long style,
 298                         const wxValidator& validator,
 299                         const wxString& name)
 300 {
 301     // pretend that wxComboBox is hidden while it is positioned and resized and
 302     // show it only right before leaving this method because otherwise there is
 303     // some noticeable flicker while the control rearranges itself
 304     m_isShown = FALSE;
 305
 306     // first create wxWin object
 307     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 308         return FALSE;
 309
 310     // get the right style
 311     long msStyle = WS_TABSTOP | WS_VSCROLL | WS_HSCROLL |
 312                    CBS_AUTOHSCROLL | CBS_NOINTEGRALHEIGHT /* | WS_CLIPSIBLINGS */;
 313     if ( style & wxCB_READONLY )
 314         msStyle |= CBS_DROPDOWNLIST;
 315 #ifndef __WXWINCE__
 316     else if ( style & wxCB_SIMPLE )
 317         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 318 #endif
 319     else
 320         msStyle |= CBS_DROPDOWN;
 321
 322     if ( style & wxCB_SORT )
 323         msStyle |= CBS_SORT;
 324
 325     if ( style & wxCLIP_SIBLINGS )
 326         msStyle |= WS_CLIPSIBLINGS;
 327
 328
 329     // and now create the MSW control
 330     if ( !MSWCreateControl(_T("COMBOBOX"), msStyle) )
 331         return FALSE;
 332
 333     // A choice/combobox normally has a white background (or other, depending
 334     // on global settings) rather than inheriting the parent's background colour.
 335     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 336
 337     for ( int i = 0; i < n; i++ )
 338     {
 339         Append(choices[i]);
 340     }
 341
 342     if ( !value.IsEmpty() )
 343     {
 344         SetValue(value);
 345     }
 346
 347     // do this after appending the values to the combobox so that autosizing
 348     // works correctly
 349     SetSize(pos.x, pos.y, size.x, size.y);
 350
 351     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 352     // and an edit control inside it and if we want to catch events from this
 353     // edit control, we must subclass it as well
 354     if ( !(style & wxCB_READONLY) )
 355     {
 356         gs_wndprocEdit = (WXFARPROC)::SetWindowLong
 357                                       (
 358                                         (HWND)GetEditHWND(),
 359                                         GWL_WNDPROC,
 360                                         (LPARAM)wxComboEditWndProc
 361                                       );
 362     }
 363
 364     // and finally, show the control
 365     Show(TRUE);
 366
 367     return TRUE;
 368 }
 369
 370 void wxComboBox::SetValue(const wxString& value)
 371 {
 372     if ( HasFlag(wxCB_READONLY) )
 373         SetStringSelection(value);
 374     else
 375         SetWindowText(GetHwnd(), value.c_str());
 376 }
 377
 378 // Clipboard operations
 379 void wxComboBox::Copy()
 380 {
 381   SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 382 }
 383
 384 void wxComboBox::Cut()
 385 {
 386   SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 387 }
 388
 389 void wxComboBox::Paste()
 390 {
 391   SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 392 }
 393
 394 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 395 {
 396   // Can't implement in MSW?
 397 //  HWND hWnd = GetHwnd();
 398 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 399 }
 400
 401 void wxComboBox::SetInsertionPoint(long pos)
 402 {
 403     if ( GetWindowStyle() & wxCB_READONLY )
 404         return;
 405
 406 #ifdef __WIN32__
 407     HWND hWnd = GetHwnd();
 408     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 409     HWND hEditWnd = (HWND) GetEditHWND() ;
 410     if ( hEditWnd )
 411     {
 412         // Scroll insertion point into view
 413         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 414         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 415         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM) wxEmptyString);
 416     }
 417 #endif // __WIN32__
 418 }
 419
 420 void wxComboBox::SetInsertionPointEnd()
 421 {
 422     // setting insertion point doesn't make sense for read only comboboxes
 423     if ( !(GetWindowStyle() & wxCB_READONLY) )
 424     {
 425         long pos = GetLastPosition();
 426         SetInsertionPoint(pos);
 427     }
 428 }
 429
 430 long wxComboBox::GetInsertionPoint() const
 431 {
 432 #ifdef __WIN32__
 433     DWORD Pos=(DWORD)SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 434     return Pos&0xFFFF;
 435 #else
 436     return 0;
 437 #endif
 438 }
 439
 440 long wxComboBox::GetLastPosition() const
 441 {
 442     HWND hEditWnd = (HWND) GetEditHWND();
 443
 444     // Get number of characters in the last (only) line. We'll add this to the character
 445     // index for the last line, 1st position.
 446     int lineLength = (int)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 447
 448     return (long)(lineLength);
 449 }
 450
 451 void wxComboBox::Replace(long from, long to, const wxString& value)
 452 {
 453 #if wxUSE_CLIPBOARD
 454     Remove(from, to);
 455
 456     // Now replace with 'value', by pasting.
 457     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 458
 459     // Paste into edit control
 460     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 461 #endif
 462 }
 463
 464 void wxComboBox::Remove(long from, long to)
 465 {
 466     // Set selection and remove it
 467     SetSelection(from, to);
 468     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 469 }
 470
 471 void wxComboBox::SetSelection(long from, long to)
 472 {
 473     HWND hWnd = GetHwnd();
 474     long fromChar = from;
 475     long toChar = to;
 476     // if from and to are both -1, it means
 477     // (in wxWindows) that all text should be selected.
 478     // This translates into Windows convention
 479     if ((from == -1) && (to == -1))
 480     {
 481       fromChar = 0;
 482       toChar = -1;
 483     }
 484
 485     if (
 486 #ifdef __WIN32__
 487     SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar))
 488 #else // Win16
 489     SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)fromChar, (LPARAM)toChar)
 490 #endif
 491         == CB_ERR )
 492     {
 493         wxLogDebug(_T("CB_SETEDITSEL failed"));
 494     }
 495 }
 496
 497 #endif
 498  // wxUSE_COMBOBOX
 499