src/msw/textentry.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/msw/textentry.cpp
   3 // Purpose:     wxTextEntry implementation for wxMSW
   4 // Author:      Vadim Zeitlin
   5 // Created:     2007-09-26
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2007 Vadim Zeitlin <vadim@wxwindows.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // for compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #ifndef WX_PRECOMP
  27     #include "wx/arrstr.h"
  28     #include "wx/string.h"
  29 #endif // WX_PRECOMP
  30
  31 #if wxUSE_TEXTCTRL || wxUSE_COMBOBOX
  32
  33 #include "wx/textentry.h"
  34 #include "wx/dynlib.h"
  35
  36 #include "wx/msw/private.h"
  37
  38 #if wxUSE_UXTHEME
  39     #include "wx/msw/uxtheme.h"
  40 #endif
  41
  42 #define GetEditHwnd() ((HWND)(GetEditHWND()))
  43
  44 // ----------------------------------------------------------------------------
  45 // wxIEnumString implements IEnumString interface
  46 // ----------------------------------------------------------------------------
  47
  48 // standard VC6 SDK (WINVER == 0x0400) does not know about IAutoComplete
  49 #if wxUSE_OLE && (WINVER >= 0x0500)
  50     #define HAS_AUTOCOMPLETE
  51 #endif
  52
  53 #ifdef HAS_AUTOCOMPLETE
  54
  55 #include "wx/msw/ole/oleutils.h"
  56 #include <shldisp.h>
  57
  58 #if defined(__MINGW32__) || defined (__WATCOMC__) || defined(__CYGWIN__)
  59     // needed for IID_IAutoComplete, IID_IAutoComplete2 and ACO_AUTOSUGGEST
  60     #include <shlguid.h>
  61 #endif
  62
  63 #ifndef ACO_UPDOWNKEYDROPSLIST
  64     #define ACO_UPDOWNKEYDROPSLIST 0x20
  65 #endif
  66
  67 #ifndef SHACF_FILESYS_ONLY
  68     #define SHACF_FILESYS_ONLY 0x00000010
  69 #endif
  70
  71 DEFINE_GUID(CLSID_AutoComplete,
  72     0x00bb2763, 0x6a77, 0x11d0, 0xa5, 0x35, 0x00, 0xc0, 0x4f, 0xd7, 0xd0, 0x62);
  73
  74 class wxIEnumString : public IEnumString
  75 {
  76 public:
  77     wxIEnumString(const wxArrayString& strings) : m_strings(strings)
  78     {
  79         m_index = 0;
  80     }
  81
  82     void ChangeStrings(const wxArrayString& strings)
  83     {
  84         m_strings = strings;
  85         Reset();
  86     }
  87
  88     DECLARE_IUNKNOWN_METHODS;
  89
  90     virtual HRESULT STDMETHODCALLTYPE Next(ULONG celt,
  91                                            LPOLESTR *rgelt,
  92                                            ULONG *pceltFetched)
  93     {
  94         if ( !rgelt || (!pceltFetched && celt > 1) )
  95             return E_POINTER;
  96
  97         ULONG pceltFetchedDummy;
  98         if ( !pceltFetched )
  99             pceltFetched = &pceltFetchedDummy;
 100
 101         *pceltFetched = 0;
 102
 103         for ( const unsigned count = m_strings.size(); celt--; ++m_index )
 104         {
 105             if ( m_index == count )
 106                 return S_FALSE;
 107
 108             const wxWX2WCbuf wcbuf = m_strings[m_index].wc_str();
 109             const size_t size = (wcslen(wcbuf) + 1)*sizeof(wchar_t);
 110             void *olestr = CoTaskMemAlloc(size);
 111             if ( !olestr )
 112                 return E_OUTOFMEMORY;
 113
 114             memcpy(olestr, wcbuf, size);
 115
 116             *rgelt++ = static_cast<LPOLESTR>(olestr);
 117
 118             ++(*pceltFetched);
 119         }
 120
 121         return S_OK;
 122     }
 123
 124     virtual HRESULT STDMETHODCALLTYPE Skip(ULONG celt)
 125     {
 126         m_index += celt;
 127         if ( m_index > m_strings.size() )
 128         {
 129             m_index = m_strings.size();
 130             return S_FALSE;
 131         }
 132
 133         return S_OK;
 134     }
 135
 136     virtual HRESULT STDMETHODCALLTYPE Reset()
 137     {
 138         m_index = 0;
 139
 140         return S_OK;
 141     }
 142
 143     virtual HRESULT STDMETHODCALLTYPE Clone(IEnumString **ppEnum)
 144     {
 145         if ( !ppEnum )
 146             return E_POINTER;
 147
 148         wxIEnumString *e = new wxIEnumString(m_strings);
 149         e->m_index = m_index;
 150
 151         e->AddRef();
 152         *ppEnum = e;
 153
 154         return S_OK;
 155     }
 156
 157 private:
 158     // dtor doesn't have to be virtual as we're only ever deleted from our own
 159     // Release() and are not meant to be derived form anyhow, but making it
 160     // virtual silences gcc warnings; making it private makes it impossible to
 161     // (mistakenly) delete us directly instead of calling Release()
 162     virtual ~wxIEnumString() { }
 163
 164
 165     wxArrayString m_strings;
 166     unsigned m_index;
 167
 168     wxDECLARE_NO_COPY_CLASS(wxIEnumString);
 169 };
 170
 171 BEGIN_IID_TABLE(wxIEnumString)
 172     ADD_IID(Unknown)
 173     ADD_IID(EnumString)
 174 END_IID_TABLE;
 175
 176 IMPLEMENT_IUNKNOWN_METHODS(wxIEnumString)
 177
 178 #endif // HAS_AUTOCOMPLETE
 179
 180 // ============================================================================
 181 // wxTextEntry implementation
 182 // ============================================================================
 183
 184 // ----------------------------------------------------------------------------
 185 // operations on text
 186 // ----------------------------------------------------------------------------
 187
 188 void wxTextEntry::WriteText(const wxString& text)
 189 {
 190     ::SendMessage(GetEditHwnd(), EM_REPLACESEL, 0, (LPARAM)text.wx_str());
 191 }
 192
 193 wxString wxTextEntry::DoGetValue() const
 194 {
 195     return wxGetWindowText(GetEditHWND());
 196 }
 197
 198 void wxTextEntry::Remove(long from, long to)
 199 {
 200     DoSetSelection(from, to, SetSel_NoScroll);
 201     WriteText(wxString());
 202 }
 203
 204 // ----------------------------------------------------------------------------
 205 // clipboard operations
 206 // ----------------------------------------------------------------------------
 207
 208 void wxTextEntry::Copy()
 209 {
 210     ::SendMessage(GetEditHwnd(), WM_COPY, 0, 0);
 211 }
 212
 213 void wxTextEntry::Cut()
 214 {
 215     ::SendMessage(GetEditHwnd(), WM_CUT, 0, 0);
 216 }
 217
 218 void wxTextEntry::Paste()
 219 {
 220     ::SendMessage(GetEditHwnd(), WM_PASTE, 0, 0);
 221 }
 222
 223 // ----------------------------------------------------------------------------
 224 // undo/redo
 225 // ----------------------------------------------------------------------------
 226
 227 void wxTextEntry::Undo()
 228 {
 229     ::SendMessage(GetEditHwnd(), EM_UNDO, 0, 0);
 230 }
 231
 232 void wxTextEntry::Redo()
 233 {
 234     // same as Undo, since Undo undoes the undo
 235     Undo();
 236     return;
 237 }
 238
 239 bool wxTextEntry::CanUndo() const
 240 {
 241     return ::SendMessage(GetEditHwnd(), EM_CANUNDO, 0, 0) != 0;
 242 }
 243
 244 bool wxTextEntry::CanRedo() const
 245 {
 246     // see comment in Redo()
 247     return CanUndo();
 248 }
 249
 250 // ----------------------------------------------------------------------------
 251 // insertion point and selection
 252 // ----------------------------------------------------------------------------
 253
 254 void wxTextEntry::SetInsertionPoint(long pos)
 255 {
 256     // calling DoSetSelection(-1, -1) would select everything which is not what
 257     // we want here
 258     if ( pos == -1 )
 259         pos = GetLastPosition();
 260
 261     // be careful to call DoSetSelection() which is overridden in wxTextCtrl
 262     // and not just SetSelection() here
 263     DoSetSelection(pos, pos);
 264 }
 265
 266 long wxTextEntry::GetInsertionPoint() const
 267 {
 268     long from;
 269     GetSelection(&from, NULL);
 270     return from;
 271 }
 272
 273 long wxTextEntry::GetLastPosition() const
 274 {
 275     return ::SendMessage(GetEditHwnd(), EM_LINELENGTH, 0, 0);
 276 }
 277
 278 void wxTextEntry::DoSetSelection(long from, long to, int WXUNUSED(flags))
 279 {
 280     // if from and to are both -1, it means (in wxWidgets) that all text should
 281     // be selected, translate this into Windows convention
 282     if ( (from == -1) && (to == -1) )
 283     {
 284         from = 0;
 285     }
 286
 287     ::SendMessage(GetEditHwnd(), EM_SETSEL, from, to);
 288 }
 289
 290 void wxTextEntry::GetSelection(long *from, long *to) const
 291 {
 292     DWORD dwStart, dwEnd;
 293     ::SendMessage(GetEditHwnd(), EM_GETSEL, (WPARAM)&dwStart, (LPARAM)&dwEnd);
 294
 295     if ( from )
 296         *from = dwStart;
 297     if ( to )
 298         *to = dwEnd;
 299 }
 300
 301 // ----------------------------------------------------------------------------
 302 // auto-completion
 303 // ----------------------------------------------------------------------------
 304
 305 #if wxUSE_OLE
 306 bool wxTextEntry::AutoCompleteFileNames()
 307 {
 308 #ifdef HAS_AUTOCOMPLETE
 309     typedef HRESULT (WINAPI *SHAutoComplete_t)(HWND, DWORD);
 310     static SHAutoComplete_t s_pfnSHAutoComplete = (SHAutoComplete_t)-1;
 311     static wxDynamicLibrary s_dllShlwapi;
 312     if ( s_pfnSHAutoComplete == (SHAutoComplete_t)-1 )
 313     {
 314         if ( !s_dllShlwapi.Load(wxT("shlwapi.dll"), wxDL_VERBATIM | wxDL_QUIET) )
 315         {
 316             s_pfnSHAutoComplete = NULL;
 317         }
 318         else
 319         {
 320             wxDL_INIT_FUNC(s_pfn, SHAutoComplete, s_dllShlwapi);
 321         }
 322     }
 323
 324     if ( !s_pfnSHAutoComplete )
 325         return false;
 326
 327     HRESULT hr = (*s_pfnSHAutoComplete)(GetEditHwnd(), SHACF_FILESYS_ONLY);
 328     if ( FAILED(hr) )
 329     {
 330         wxLogApiError(wxT("SHAutoComplete()"), hr);
 331
 332         return false;
 333     }
 334     return true;
 335 #else // !HAS_AUTOCOMPLETE
 336     return false;
 337 #endif // HAS_AUTOCOMPLETE/!HAS_AUTOCOMPLETE
 338 }
 339
 340 bool wxTextEntry::AutoComplete(const wxArrayString& choices)
 341 {
 342 #ifdef HAS_AUTOCOMPLETE
 343     // if we had an old enumerator we must reuse it as IAutoComplete doesn't
 344     // free it if we call Init() again (see #10968) -- and it's also simpler
 345     if ( m_enumStrings )
 346     {
 347         m_enumStrings->ChangeStrings(choices);
 348         return true;
 349     }
 350
 351     // create an object exposing IAutoComplete interface (don't go for
 352     // IAutoComplete2 immediately as, presumably, it might be not available on
 353     // older systems as otherwise why do we have both -- although in practice I
 354     // don't know when can this happen)
 355     IAutoComplete *pAutoComplete = NULL;
 356     HRESULT hr = CoCreateInstance
 357                  (
 358                     CLSID_AutoComplete,
 359                     NULL,
 360                     CLSCTX_INPROC_SERVER,
 361                     IID_IAutoComplete,
 362                     reinterpret_cast<void **>(&pAutoComplete)
 363                  );
 364     if ( FAILED(hr) )
 365     {
 366         wxLogApiError(wxT("CoCreateInstance(CLSID_AutoComplete)"), hr);
 367         return false;
 368     }
 369
 370     // associate it with our strings
 371     m_enumStrings = new wxIEnumString(choices);
 372     m_enumStrings->AddRef();
 373     hr = pAutoComplete->Init(GetEditHwnd(), m_enumStrings, NULL, NULL);
 374     m_enumStrings->Release();
 375     if ( FAILED(hr) )
 376     {
 377         wxLogApiError(wxT("IAutoComplete::Init"), hr);
 378         return false;
 379     }
 380
 381     // if IAutoComplete2 is available, set more user-friendly options
 382     IAutoComplete2 *pAutoComplete2 = NULL;
 383     hr = pAutoComplete->QueryInterface
 384                         (
 385                            IID_IAutoComplete2,
 386                            reinterpret_cast<void **>(&pAutoComplete2)
 387                         );
 388     if ( SUCCEEDED(hr) )
 389     {
 390         pAutoComplete2->SetOptions(ACO_AUTOSUGGEST | ACO_UPDOWNKEYDROPSLIST);
 391         pAutoComplete2->Release();
 392     }
 393
 394     // the docs are unclear about when can we release it but it seems safe to
 395     // do it immediately, presumably the edit control itself keeps a reference
 396     // to the auto completer object
 397     pAutoComplete->Release();
 398     return true;
 399 #else // !HAS_AUTOCOMPLETE
 400     wxUnusedVar(choices);
 401
 402     return false;
 403 #endif // HAS_AUTOCOMPLETE/!HAS_AUTOCOMPLETE
 404 }
 405 #endif // wxUSE_OLE
 406
 407 // ----------------------------------------------------------------------------
 408 // editable state
 409 // ----------------------------------------------------------------------------
 410
 411 bool wxTextEntry::IsEditable() const
 412 {
 413     return !(::GetWindowLong(GetEditHwnd(), GWL_STYLE) & ES_READONLY);
 414 }
 415
 416 void wxTextEntry::SetEditable(bool editable)
 417 {
 418     ::SendMessage(GetEditHwnd(), EM_SETREADONLY, !editable, 0);
 419 }
 420
 421 // ----------------------------------------------------------------------------
 422 // max length
 423 // ----------------------------------------------------------------------------
 424
 425 void wxTextEntry::SetMaxLength(unsigned long len)
 426 {
 427     if ( len >= 0xffff )
 428     {
 429         // this will set it to a platform-dependent maximum (much more
 430         // than 64Kb under NT)
 431         len = 0;
 432     }
 433
 434     ::SendMessage(GetEditHwnd(), EM_LIMITTEXT, len, 0);
 435 }
 436
 437 // ----------------------------------------------------------------------------
 438 // hints
 439 // ----------------------------------------------------------------------------
 440
 441 #if wxUSE_UXTHEME
 442
 443 #ifndef EM_SETCUEBANNER
 444     #define EM_SETCUEBANNER 0x1501
 445     #define EM_GETCUEBANNER 0x1502
 446 #endif
 447
 448 bool wxTextEntry::SetHint(const wxString& hint)
 449 {
 450     if ( wxUxThemeEngine::GetIfActive() )
 451     {
 452         // notice that this message always works with Unicode strings
 453         //
 454         // we always use TRUE for wParam to show the hint even when the window
 455         // has focus, otherwise there would be no way to show the hint for the
 456         // initially focused window
 457         if ( ::SendMessage(GetEditHwnd(), EM_SETCUEBANNER,
 458                              TRUE, (LPARAM)(const wchar_t *)hint.wc_str()) )
 459             return true;
 460     }
 461
 462     return wxTextEntryBase::SetHint(hint);
 463 }
 464
 465 wxString wxTextEntry::GetHint() const
 466 {
 467     if ( wxUxThemeEngine::GetIfActive() )
 468     {
 469         wchar_t buf[256];
 470         if ( ::SendMessage(GetEditHwnd(), EM_GETCUEBANNER,
 471                             (WPARAM)buf, WXSIZEOF(buf)) )
 472             return wxString(buf);
 473     }
 474
 475     return wxTextEntryBase::GetHint();
 476 }
 477
 478
 479 #endif // wxUSE_UXTHEME
 480
 481 // ----------------------------------------------------------------------------
 482 // margins support
 483 // ----------------------------------------------------------------------------
 484
 485 bool wxTextEntry::DoSetMargins(const wxPoint& margins)
 486 {
 487 #if !defined(__WXWINCE__)
 488     bool res = true;
 489
 490     if ( margins.x != -1 )
 491     {
 492         // left margin
 493         ::SendMessage(GetEditHwnd(), EM_SETMARGINS,
 494                       EC_LEFTMARGIN, MAKELONG(margins.x, 0));
 495     }
 496
 497     if ( margins.y != -1 )
 498     {
 499         res = false;
 500     }
 501
 502     return res;
 503 #else
 504     return false;
 505 #endif
 506 }
 507
 508 wxPoint wxTextEntry::DoGetMargins() const
 509 {
 510 #if !defined(__WXWINCE__)
 511     LRESULT lResult = ::SendMessage(GetEditHwnd(), EM_GETMARGINS,
 512                                     0, 0);
 513     int left = LOWORD(lResult);
 514     int top = -1;
 515     return wxPoint(left, top);
 516 #else
 517     return wxPoint(-1, -1);
 518 #endif
 519 }
 520
 521 #endif // wxUSE_TEXTCTRL || wxUSE_COMBOBOX