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     // 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 #if wxUSE_CTL3D
 160                                WXUINT message,
 161                                WXWPARAM wParam,
 162                                WXLPARAM lParam
 163 #else
 164                                WXUINT WXUNUSED(message),
 165                                WXWPARAM WXUNUSED(wParam),
 166                                WXLPARAM WXUNUSED(lParam)
 167 #endif
 168     )
 169 {
 170 #if wxUSE_CTL3D
 171     if ( m_useCtl3D )
 172     {
 173         HBRUSH hbrush = Ctl3dCtlColorEx(message, wParam, lParam);
 174         return (WXHBRUSH) hbrush;
 175     }
 176 #endif // wxUSE_CTL3D
 177
 178     HDC hdc = (HDC)pDC;
 179     if (GetParent()->GetTransparentBackground())
 180         SetBkMode(hdc, TRANSPARENT);
 181     else
 182         SetBkMode(hdc, OPAQUE);
 183
 184     wxColour colBack = GetBackgroundColour();
 185
 186     if (!IsEnabled())
 187         colBack = wxSystemSettings::GetColour(wxSYS_COLOUR_3DFACE);
 188
 189     ::SetBkColor(hdc, wxColourToRGB(colBack));
 190     ::SetTextColor(hdc, wxColourToRGB(GetForegroundColour()));
 191
 192     wxBrush *brush = wxTheBrushList->FindOrCreateBrush(colBack, wxSOLID);
 193
 194     return (WXHBRUSH)brush->GetResourceHandle();
 195 }
 196
 197 // ----------------------------------------------------------------------------
 198 // wxComboBox
 199 // ----------------------------------------------------------------------------
 200
 201 bool wxComboBox::MSWProcessEditMsg(WXUINT msg, WXWPARAM wParam, WXLPARAM lParam)
 202 {
 203     switch ( msg )
 204     {
 205         case WM_CHAR:
 206             // for compatibility with wxTextCtrl, generate a special message
 207             // when Enter is pressed
 208             if ( wParam == VK_RETURN )
 209             {
 210                 wxCommandEvent event(wxEVT_COMMAND_TEXT_ENTER, m_windowId);
 211                 InitCommandEvent(event);
 212                 event.SetString(GetValue());
 213                 event.SetInt(GetSelection());
 214                 ProcessCommand(event);
 215             }
 216
 217             return HandleChar(wParam, lParam, TRUE /* isASCII */);
 218
 219         case WM_KEYDOWN:
 220             return HandleKeyDown(wParam, lParam);
 221
 222         case WM_KEYUP:
 223             return HandleKeyUp(wParam, lParam);
 224
 225         case WM_SETFOCUS:
 226             return HandleSetFocus((WXHWND)wParam);
 227
 228         case WM_KILLFOCUS:
 229             return HandleKillFocus((WXHWND)wParam);
 230     }
 231
 232     return FALSE;
 233 }
 234
 235 bool wxComboBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
 236 {
 237     wxString value;
 238     int sel = -1;
 239     switch ( param )
 240     {
 241         case CBN_SELCHANGE:
 242             sel = GetSelection();
 243             if ( sel > -1 )
 244             {
 245                 value = GetString(sel);
 246
 247                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
 248                 event.SetInt(sel);
 249                 event.SetEventObject(this);
 250                 event.SetString(value);
 251                 ProcessCommand(event);
 252             }
 253             else
 254             {
 255                 break;
 256             }
 257
 258             // fall through: for compability with wxGTK, also send the text
 259             // update event when the selection changes (this also seems more
 260             // logical as the text does change)
 261
 262         case CBN_EDITCHANGE:
 263             {
 264                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
 265
 266                 // if sel != -1, value was initialized above (and we can't use
 267                 // GetValue() here as it would return the old selection and we
 268                 // want the new one)
 269                 if ( sel == -1 )
 270                 {
 271                     value = GetValue();
 272                 }
 273                 else // we're synthesizing text updated event from sel change
 274                 {
 275                     // we need to do this because the user code expects
 276                     // wxComboBox::GetValue() to return the new value from
 277                     // "text updated" handler but it hadn't been updated yet
 278                     SetValue(value);
 279                 }
 280
 281                 event.SetString(value);
 282                 event.SetEventObject(this);
 283                 ProcessCommand(event);
 284             }
 285             break;
 286     }
 287
 288     // there is no return value for the CBN_ notifications, so always return
 289     // FALSE from here to pass the message to DefWindowProc()
 290     return FALSE;
 291 }
 292
 293 WXHWND wxComboBox::GetEditHWND() const
 294 {
 295     // this function should not be called for wxCB_READONLY controls, it is
 296     // the callers responsability to check this
 297     wxASSERT_MSG( !(GetWindowStyle() & wxCB_READONLY),
 298                   _T("read-only combobox doesn't have any edit control") );
 299
 300     POINT pt;
 301     pt.x = pt.y = 4;
 302     HWND hwndEdit = ::ChildWindowFromPoint(GetHwnd(), pt);
 303     if ( !hwndEdit || hwndEdit == GetHwnd() )
 304     {
 305         wxFAIL_MSG(_T("not read only combobox without edit control?"));
 306     }
 307
 308     return (WXHWND)hwndEdit;
 309 }
 310
 311 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
 312                         const wxString& value,
 313                         const wxPoint& pos,
 314                         const wxSize& size,
 315                         int n, const wxString choices[],
 316                         long style,
 317                         const wxValidator& validator,
 318                         const wxString& name)
 319 {
 320     // pretend that wxComboBox is hidden while it is positioned and resized and
 321     // show it only right before leaving this method because otherwise there is
 322     // some noticeable flicker while the control rearranges itself
 323     m_isShown = FALSE;
 324
 325     // first create wxWin object
 326     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
 327         return FALSE;
 328
 329     // get the right style
 330     long msStyle = WS_TABSTOP | WS_VSCROLL | WS_HSCROLL |
 331                    CBS_AUTOHSCROLL | CBS_NOINTEGRALHEIGHT /* | WS_CLIPSIBLINGS */;
 332     if ( style & wxCB_READONLY )
 333         msStyle |= CBS_DROPDOWNLIST;
 334     else if ( style & wxCB_SIMPLE )
 335         msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 336     else
 337         msStyle |= CBS_DROPDOWN;
 338
 339     if ( style & wxCB_SORT )
 340         msStyle |= CBS_SORT;
 341
 342     if ( style & wxCLIP_SIBLINGS )
 343         msStyle |= WS_CLIPSIBLINGS;
 344
 345
 346     // and now create the MSW control
 347     if ( !MSWCreateControl(_T("COMBOBOX"), msStyle) )
 348         return FALSE;
 349
 350     // A choice/combobox normally has a white background (or other, depending
 351     // on global settings) rather than inheriting the parent's background colour.
 352     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 353
 354     for ( int i = 0; i < n; i++ )
 355     {
 356         Append(choices[i]);
 357     }
 358
 359     if ( !value.IsEmpty() )
 360     {
 361         SetValue(value);
 362     }
 363
 364     // do this after appending the values to the combobox so that autosizing
 365     // works correctly
 366     SetSize(pos.x, pos.y, size.x, size.y);
 367
 368     // a (not read only) combobox is, in fact, 2 controls: the combobox itself
 369     // and an edit control inside it and if we want to catch events from this
 370     // edit control, we must subclass it as well
 371     if ( !(style & wxCB_READONLY) )
 372     {
 373         gs_wndprocEdit = (WXFARPROC)::SetWindowLong
 374                                       (
 375                                         (HWND)GetEditHWND(),
 376                                         GWL_WNDPROC,
 377                                         (LPARAM)wxComboEditWndProc
 378                                       );
 379     }
 380
 381     // and finally, show the control
 382     Show(TRUE);
 383
 384     return TRUE;
 385 }
 386
 387 void wxComboBox::SetValue(const wxString& value)
 388 {
 389     if ( HasFlag(wxCB_READONLY) )
 390         SetStringSelection(value);
 391     else
 392         SetWindowText(GetHwnd(), value.c_str());
 393 }
 394
 395 // Clipboard operations
 396 void wxComboBox::Copy()
 397 {
 398   SendMessage(GetHwnd(), WM_COPY, 0, 0L);
 399 }
 400
 401 void wxComboBox::Cut()
 402 {
 403   SendMessage(GetHwnd(), WM_CUT, 0, 0L);
 404 }
 405
 406 void wxComboBox::Paste()
 407 {
 408   SendMessage(GetHwnd(), WM_PASTE, 0, 0L);
 409 }
 410
 411 void wxComboBox::SetEditable(bool WXUNUSED(editable))
 412 {
 413   // Can't implement in MSW?
 414 //  HWND hWnd = GetHwnd();
 415 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 416 }
 417
 418 void wxComboBox::SetInsertionPoint(long pos)
 419 {
 420     if ( GetWindowStyle() & wxCB_READONLY )
 421         return;
 422
 423 #ifdef __WIN32__
 424     HWND hWnd = GetHwnd();
 425     ::SendMessage(hWnd, CB_SETEDITSEL, 0, MAKELPARAM(pos, pos));
 426     HWND hEditWnd = (HWND) GetEditHWND() ;
 427     if ( hEditWnd )
 428     {
 429         // Scroll insertion point into view
 430         SendMessage(hEditWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 431         // Why is this necessary? (Copied from wxTextCtrl::SetInsertionPoint)
 432         SendMessage(hEditWnd, EM_REPLACESEL, 0, (LPARAM)_T(""));
 433     }
 434 #endif // __WIN32__
 435 }
 436
 437 void wxComboBox::SetInsertionPointEnd()
 438 {
 439     // setting insertion point doesn't make sense for read only comboboxes
 440     if ( !(GetWindowStyle() & wxCB_READONLY) )
 441     {
 442         long pos = GetLastPosition();
 443         SetInsertionPoint(pos);
 444     }
 445 }
 446
 447 long wxComboBox::GetInsertionPoint() const
 448 {
 449 #ifdef __WIN32__
 450     DWORD Pos=(DWORD)SendMessage(GetHwnd(), CB_GETEDITSEL, 0, 0L);
 451     return Pos&0xFFFF;
 452 #else
 453     return 0;
 454 #endif
 455 }
 456
 457 long wxComboBox::GetLastPosition() const
 458 {
 459     HWND hEditWnd = (HWND) GetEditHWND();
 460
 461     // Get number of characters in the last (only) line. We'll add this to the character
 462     // index for the last line, 1st position.
 463     int lineLength = (int)SendMessage(hEditWnd, EM_LINELENGTH, (WPARAM) 0, (LPARAM)0L);
 464
 465     return (long)(lineLength);
 466 }
 467
 468 void wxComboBox::Replace(long from, long to, const wxString& value)
 469 {
 470 #if wxUSE_CLIPBOARD
 471     Remove(from, to);
 472
 473     // Now replace with 'value', by pasting.
 474     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 475
 476     // Paste into edit control
 477     SendMessage(GetHwnd(), WM_PASTE, (WPARAM)0, (LPARAM)0L);
 478 #endif
 479 }
 480
 481 void wxComboBox::Remove(long from, long to)
 482 {
 483     // Set selection and remove it
 484     SetSelection(from, to);
 485     SendMessage(GetHwnd(), WM_CUT, (WPARAM)0, (LPARAM)0);
 486 }
 487
 488 void wxComboBox::SetSelection(long from, long to)
 489 {
 490     HWND hWnd = GetHwnd();
 491     long fromChar = from;
 492     long toChar = to;
 493     // if from and to are both -1, it means
 494     // (in wxWindows) that all text should be selected.
 495     // This translates into Windows convention
 496     if ((from == -1) && (to == -1))
 497     {
 498       fromChar = 0;
 499       toChar = -1;
 500     }
 501
 502     if (
 503 #ifdef __WIN32__
 504     SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar))
 505 #else // Win16
 506     SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)fromChar, (LPARAM)toChar)
 507 #endif
 508         == CB_ERR )
 509     {
 510         wxLogDebug(_T("CB_SETEDITSEL failed"));
 511     }
 512 }
 513
 514 #endif
 515  // wxUSE_COMBOBOX
 516