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 and Markus Holzem
   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 #endif
  37
  38 #include "wx/combobox.h"
  39 #include "wx/brush.h"
  40 #include "wx/clipbrd.h"
  41 #include "wx/msw/private.h"
  42
  43 #if wxUSE_TOOLTIPS
  44     #if !defined(__GNUWIN32_OLD__) || defined(__CYGWIN10__)
  45         #include <commctrl.h>
  46     #endif
  47     #include "wx/tooltip.h"
  48 #endif // wxUSE_TOOLTIPS
  49
  50 // ----------------------------------------------------------------------------
  51 // wxWin macros
  52 // ----------------------------------------------------------------------------
  53
  54 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)
  55
  56 // ----------------------------------------------------------------------------
  57 // function prototypes
  58 // ----------------------------------------------------------------------------
  59
  60 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
  61                                             UINT message,
  62                                             WPARAM wParam,
  63                                             LPARAM lParam);
  64
  65 // ---------------------------------------------------------------------------
  66 // global vars
  67 // ---------------------------------------------------------------------------
  68
  69 // the pointer to standard radio button wnd proc
  70 static WXFARPROC gs_wndprocEdit = (WXFARPROC)NULL;
  71
  72 // ============================================================================
  73 // implementation
  74 // ============================================================================
  75
  76 // ----------------------------------------------------------------------------
  77 // wnd proc for subclassed edit control
  78 // ----------------------------------------------------------------------------
  79
  80 LRESULT APIENTRY _EXPORT wxComboEditWndProc(HWND hWnd,
  81                                             UINT message,
  82                                             WPARAM wParam,
  83                                             LPARAM lParam)
  84 {
  85     HWND hwndCombo = ::GetParent(hWnd);
  86     wxWindow *win = wxFindWinFromHandle((WXHWND)hwndCombo);
  87
  88     switch ( message )
  89     {
  90         // forward some messages to the combobox
  91         case WM_KEYUP:
  92         case WM_KEYDOWN:
  93         case WM_CHAR:
  94             {
  95                 wxComboBox *combo = wxDynamicCast(win, wxComboBox);
  96                 wxCHECK_MSG( combo, 0, _T("should have combo as parent") );
  97
  98                 if ( combo->MSWProcessEditMsg(message, wParam, lParam) )
  99                     return 0;
 100             }
 101             break;
 102
 103 #if 0
 104         case WM_GETDLGCODE:
 105             {
 106                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 107
 108                 if ( win->GetWindowStyle() & wxPROCESS_ENTER )
 109                 {
 110                     // need to return a custom dlg code or we'll never get it
 111                     return DLGC_WANTMESSAGE;
 112                 }
 113             }
 114             break;
 115 #endif // 0
 116
 117         // deal with tooltips here
 118 #if wxUSE_TOOLTIPS && defined(TTN_NEEDTEXT)
 119         case WM_NOTIFY:
 120             {
 121                 wxCHECK_MSG( win, 0, _T("should have a parent") );
 122
 123                 NMHDR* hdr = (NMHDR *)lParam;
 124                 if ( (int)hdr->code == TTN_NEEDTEXT )
 125                 {
 126                     wxToolTip *tooltip = win->GetToolTip();
 127                     if ( tooltip )
 128                     {
 129                         TOOLTIPTEXT *ttt = (TOOLTIPTEXT *)lParam;
 130                         ttt->lpszText = (wxChar *)tooltip->GetTip().c_str();
 131                     }
 132
 133                     // processed
 134                     return 0;
 135                 }
 136             }
 137             break;
 138 #endif // wxUSE_TOOLTIPS
 139     }
 140
 141     return ::CallWindowProc(CASTWNDPROC gs_wndprocEdit, hWnd, message, wParam, lParam);
 142 }
 143
 144 WXHBRUSH wxComboBox::OnCtlColor(WXHDC pDC, WXHWND WXUNUSED(pWnd), WXUINT WXUNUSED(nCtlColor),
 145 #if wxUSE_CTL3D
 146                                WXUINT message,
 147                                WXWPARAM wParam,
 148                                WXLPARAM lParam
 149 #else
 150                                WXUINT WXUNUSED(message),
 151                                WXWPARAM WXUNUSED(wParam),
 152                                WXLPARAM WXUNUSED(lParam)
 153 #endif
 154     )
 155 {
 156 #if wxUSE_CTL3D
 157     if ( m_useCtl3D )
 158     {
 159         HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 160         return (WXHBRUSH) hbrush;
 161     }
 162 #endif // wxUSE_CTL3D
 163
 164     HDC hdc = (HDC)pDC;
 165     if (GetParent()->GetTransparentBackground())
 166         SetBkMode(hdc, TRANSPARENT);
 167     else
 168         SetBkMode(hdc, OPAQUE);
 169
 170     wxColour colBack = GetBackgroundColour();
 171
 172     if (!IsEnabled())
 173         colBack = wxSystemSettings::GetSystemColour(wxSYS_COLOUR_3DFACE);
 174
 175     ::SetBkColor(hdc, wxColourToRGB(colBack));
 176     ::SetTextColor(hdc, wxColourToRGB(GetForegroundColour()));
 177
 178     wxBrush *brush = wxTheBrushList->FindOrCreateBrush(colBack, wxSOLID);
 179
 180     return (WXHBRUSH)brush->GetResourceHandle();
 181 }
 182
 183 // ----------------------------------------------------------------------------
 184 // wxComboBox
 185 // ----------------------------------------------------------------------------
 186
 187 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 188 {
 189     switch ( msg )
 190     {
 191         case WM_CHAR:
 192             return HandleChar(wParam, lParam, TRUE /* isASCII */);
 193
 194         case WM_KEYDOWN:
 195             return HandleKeyDown(wParam, lParam);
 196
 197         case WM_KEYUP:
 198             return HandleKeyUp(wParam, lParam);
 199     }
 200
 201     return FALSE;
 202 }
 203
 204 bool wxComboBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 205 {
 206     wxString value;
 207     int sel = -1;
 208     switch ( param )
 209     {
 210         case CBN_SELCHANGE:
 211             sel = GetSelection();
 212             if ( sel > -1 )
 213             {
 214                 value = GetString(sel);
 215
 216                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 217                 event.SetInt(sel);
 218                 event.SetEventObject(this);
 219                 event.SetString(value);
 220                 ProcessCommand(event);
 221             }
 222             else
 223             {
 224                 break;
 225             }
 226
 227             // fall through: for compability with wxGTK, also send the text
 228             // update event when the selection changes (this also seems more
 229             // logical as the text does change)
 230
 231         case CBN_EDITCHANGE:
 232             {
 233                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 234
 235                 // if sel != -1, value was initialized above (and we can't use
 236                 // GetValue() here as it would return the old selection and we
 237                 // want the new one)
 238                 if ( sel == -1 )
 239                 {
 240                     value = GetValue();
 241                 }
 242                 else // we're synthesizing text updated event from sel change
 243                 {
 244                     // we need to do this because the user code expects
 245                     // wxComboBox::GetValue() to return the new value from
 246                     // "text updated" handler but it hadn't been updated yet
 247                     SetValue(value);
 248                 }
 249
 250                 event.SetString(value);
 251                 event.SetEventObject(this);
 252                 ProcessCommand(event);
 253             }
 254             break;
 255     }
 256
 257     // there is no return value for the CBN_ notifications, so always return
 258     // FALSE from here to pass the message to DefWindowProc()
 259     return FALSE;
 260 }
 261
 262 WXHWND wxComboBox::GetEditHWND() const
 263 {
 264     // this function should not be called for wxCB_READONLY controls, it is
 265     // the callers responsability to check this
 266     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 267                   _T("read-only combobox doesn't have any edit control") );
 268
 269     POINT pt;
 270     pt.x = pt.y = 4;
 271     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 272     if ( !hwndEdit || hwndEdit == GetHwnd() )
 273     {
 274         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 275     }
 276
 277     return (WXHWND)hwndEdit;
 278 }
 279
 280 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 281                         const wxString& value,
 282                         const wxPoint& pos,
 283                         const wxSize& size,
 284                         int n, const wxString choices[],
 285                         long style,
 286                         const wxValidator& validator,
 287                         const wxString& name)
 288 {
 289     // first create wxWin object
 290     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 291         return FALSE;
 292
 293     // get the right style
 294     long msStyle = WS_TABSTOP | WS_VSCROLL | WS_HSCROLL |
 295                    CBS_AUTOHSCROLL | CBS_NOINTEGRALHEIGHT /* | WS_CLIPSIBLINGS */;
 296     if ( style & wxCB_READONLY )
 297         msStyle |= CBS_DROPDOWNLIST;
 298     else if ( style & wxCB_SIMPLE )
 299         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 300     else
 301         msStyle |= CBS_DROPDOWN;
 302
 303     if ( style & wxCB_SORT )
 304         msStyle |= CBS_SORT;
 305
 306     if ( style & wxCLIP_SIBLINGS )
 307         msStyle |= WS_CLIPSIBLINGS;
 308
 309
 310     // and now create the MSW control
 311     if ( !MSWCreateControl(_T("COMBOBOX"), msStyle) )
 312         return FALSE;
 313
 314     // A choice/combobox normally has a white background (or other, depending
 315     // on global settings) rather than inheriting the parent's background colour.
 316     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
 317
 318     for ( int i = 0; i < n; i++ )
 319     {
 320         Append(choices[i]);
 321     }
 322
 323     if ( !value.IsEmpty() )
 324     {
 325         SetValue(value);
 326     }
 327
 328     // do this after appending the values to the combobox so that autosizing
 329     // works correctly
 330     SetSize(pos.x, pos.y, size.x, size.y);
 331
 332     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 333     // and an edit control inside it and if we want to catch events from this
 334     // edit control, we must subclass it as well
 335     if ( !(style & wxCB_READONLY) )
 336     {
 337         gs_wndprocEdit = (WXFARPROC)::SetWindowLong
 338                                       (
 339                                         (HWND)GetEditHWND(),
 340                                         GWL_WNDPROC,
 341                                         (LPARAM)wxComboEditWndProc
 342                                       );
 343     }
 344
 345     return TRUE;
 346 }
 347
 348 // TODO: update and clear all this horrible mess (VZ)
 349
 350 void wxComboBox::SetValue(const wxString& value)
 351 {
 352   // If newlines are denoted by just 10, must stick 13 in front.
 353   int singletons = 0;
 354   int len = value.Length();
 355   int i;
 356   for (i = 0; i < len; i ++)
 357   {
 358     if ((i > 0) && (value[i] == 10) && (value[i-1] != 13))
 359       singletons ++;
 360   }
 361   if (singletons > 0)
 362   {
 363     wxChar *tmp = new wxChar[len + singletons + 1];
 364     int j = 0;
 365     for (i = 0; i < len; i ++)
 366     {
 367       if ((i > 0) && (value[i] == 10) && (value[i-1] != 13))
 368       {
 369         tmp[j] = 13;
 370         j ++;
 371       }
 372       tmp[j] = value[i];
 373       j ++;
 374     }
 375     tmp[j] = 0;
 376     SetWindowText(GetHwnd(), tmp);
 377     delete[] tmp;
 378   }
 379   else
 380     SetWindowText(GetHwnd(), value);
 381 }
 382
 383 // Clipboard operations
 384 void wxComboBox::Copy()
 385 {
 386   HWND hWnd = GetHwnd();
 387   SendMessage(hWnd, WM_COPY, 0, 0L);
 388 }
 389
 390 void wxComboBox::Cut()
 391 {
 392   HWND hWnd = GetHwnd();
 393   SendMessage(hWnd, WM_CUT, 0, 0L);
 394 }
 395
 396 void wxComboBox::Paste()
 397 {
 398   HWND hWnd = GetHwnd();
 399   SendMessage(hWnd, WM_PASTE, 0, 0L);
 400 }
 401
 402 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 403 {
 404   // Can't implement in MSW?
 405 //  HWND hWnd = GetHwnd();
 406 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 407 }
 408
 409 void wxComboBox::SetInsertionPoint(long pos)
 410 {
 411     if ( GetWindowStyle() & wxCB_READONLY )
 412         return;
 413
 414 #ifdef __WIN32__
 415     HWND hWnd = GetHwnd();
 416     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 417     HWND hEditWnd = (HWND) GetEditHWND() ;
 418     if ( hEditWnd )
 419     {
 420         // Scroll insertion point into view
 421         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 422         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 423         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM)_T(""));
 424     }
 425 #endif // __WIN32__
 426 }
 427
 428 void wxComboBox::SetInsertionPointEnd()
 429 {
 430     // setting insertion point doesn't make sense for read only comboboxes
 431     if ( !(GetWindowStyle() & wxCB_READONLY) )
 432     {
 433         long pos = GetLastPosition();
 434         SetInsertionPoint(pos);
 435     }
 436 }
 437
 438 long wxComboBox::GetInsertionPoint() const
 439 {
 440 #ifdef __WIN32__
 441     DWORD Pos=(DWORD)SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 442     return Pos&0xFFFF;
 443 #else
 444     return 0;
 445 #endif
 446 }
 447
 448 long wxComboBox::GetLastPosition() const
 449 {
 450     HWND hEditWnd = (HWND) GetEditHWND();
 451
 452     // Get number of characters in the last (only) line. We'll add this to the character
 453     // index for the last line, 1st position.
 454     int lineLength = (int)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 455
 456     return (long)(lineLength);
 457 }
 458
 459 void wxComboBox::Replace(long from, long to, const wxString& value)
 460 {
 461 #if wxUSE_CLIPBOARD
 462     Remove(from, to);
 463
 464     // Now replace with 'value', by pasting.
 465     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 466
 467     // Paste into edit control
 468     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 469 #endif
 470 }
 471
 472 void wxComboBox::Remove(long from, long to)
 473 {
 474     // Set selection and remove it
 475     SetSelection(from, to);
 476     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 477 }
 478
 479 void wxComboBox::SetSelection(long from, long to)
 480 {
 481     HWND hWnd = GetHwnd();
 482     long fromChar = from;
 483     long toChar = to;
 484     // if from and to are both -1, it means
 485     // (in wxWindows) that all text should be selected.
 486     // This translates into Windows convention
 487     if ((from == -1) && (to == -1))
 488     {
 489       fromChar = 0;
 490       toChar = -1;
 491     }
 492
 493     if (
 494 #ifdef __WIN32__
 495     SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar))
 496 #else // Win16
 497     SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)fromChar, (LPARAM)toChar)
 498 #endif
 499         == CB_ERR )
 500     {
 501         wxLogDebug(_T("CB_SETEDITSEL failed"));
 502     }
 503 }
 504
 505 #endif
 506  // wxUSE_COMBOBOX
 507