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__)
  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     DECLARE_IUNKNOWN_METHODS;
  83
  84     virtual HRESULT STDMETHODCALLTYPE Next(ULONG celt,
  85                                            LPOLESTR *rgelt,
  86                                            ULONG *pceltFetched)
  87     {
  88         if ( !rgelt || (!pceltFetched && celt > 1) )
  89             return E_POINTER;
  90
  91         ULONG pceltFetchedDummy;
  92         if ( !pceltFetched )
  93             pceltFetched = &pceltFetchedDummy;
  94
  95         *pceltFetched = 0;
  96
  97         for ( const unsigned count = m_strings.size(); celt--; ++m_index )
  98         {
  99             if ( m_index == count )
 100                 return S_FALSE;
 101
 102             const wxWX2WCbuf wcbuf = m_strings[m_index].wc_str();
 103             const size_t size = (wcslen(wcbuf) + 1)*sizeof(wchar_t);
 104             void *olestr = CoTaskMemAlloc(size);
 105             if ( !olestr )
 106                 return E_OUTOFMEMORY;
 107
 108             memcpy(olestr, wcbuf, size);
 109
 110             *rgelt++ = static_cast<LPOLESTR>(olestr);
 111
 112             ++(*pceltFetched);
 113         }
 114
 115         return S_OK;
 116     }
 117
 118     virtual HRESULT STDMETHODCALLTYPE Skip(ULONG celt)
 119     {
 120         m_index += celt;
 121         if ( m_index > m_strings.size() )
 122         {
 123             m_index = m_strings.size();
 124             return S_FALSE;
 125         }
 126
 127         return S_OK;
 128     }
 129
 130     virtual HRESULT STDMETHODCALLTYPE Reset()
 131     {
 132         m_index = 0;
 133
 134         return S_OK;
 135     }
 136
 137     virtual HRESULT STDMETHODCALLTYPE Clone(IEnumString **ppEnum)
 138     {
 139         if ( !ppEnum )
 140             return E_POINTER;
 141
 142         wxIEnumString *e = new wxIEnumString(m_strings);
 143         e->m_index = m_index;
 144
 145         e->AddRef();
 146         *ppEnum = e;
 147
 148         return S_OK;
 149     }
 150
 151 private:
 152     // dtor doesn't have to be virtual as we're only ever deleted from our own
 153     // Release() and are not meant to be derived form anyhow, but making it
 154     // virtual silences gcc warnings; making it private makes it impossible to
 155     // (mistakenly) delete us directly instead of calling Release()
 156     virtual ~wxIEnumString() { }
 157
 158
 159     const wxArrayString m_strings;
 160     unsigned m_index;
 161
 162     wxDECLARE_NO_COPY_CLASS(wxIEnumString);
 163 };
 164
 165 BEGIN_IID_TABLE(wxIEnumString)
 166     ADD_IID(Unknown)
 167     ADD_IID(EnumString)
 168 END_IID_TABLE;
 169
 170 IMPLEMENT_IUNKNOWN_METHODS(wxIEnumString)
 171
 172 #endif // HAS_AUTOCOMPLETE
 173
 174 // ============================================================================
 175 // wxTextEntry implementation
 176 // ============================================================================
 177
 178 // ----------------------------------------------------------------------------
 179 // operations on text
 180 // ----------------------------------------------------------------------------
 181
 182 void wxTextEntry::WriteText(const wxString& text)
 183 {
 184     ::SendMessage(GetEditHwnd(), EM_REPLACESEL, 0, (LPARAM)text.wx_str());
 185 }
 186
 187 wxString wxTextEntry::GetValue() const
 188 {
 189     return wxGetWindowText(GetEditHWND());
 190 }
 191
 192 void wxTextEntry::Remove(long from, long to)
 193 {
 194     DoSetSelection(from, to, SetSel_NoScroll);
 195     WriteText(wxString());
 196 }
 197
 198 // ----------------------------------------------------------------------------
 199 // clipboard operations
 200 // ----------------------------------------------------------------------------
 201
 202 void wxTextEntry::Copy()
 203 {
 204     ::SendMessage(GetEditHwnd(), WM_COPY, 0, 0);
 205 }
 206
 207 void wxTextEntry::Cut()
 208 {
 209     ::SendMessage(GetEditHwnd(), WM_CUT, 0, 0);
 210 }
 211
 212 void wxTextEntry::Paste()
 213 {
 214     ::SendMessage(GetEditHwnd(), WM_PASTE, 0, 0);
 215 }
 216
 217 // ----------------------------------------------------------------------------
 218 // undo/redo
 219 // ----------------------------------------------------------------------------
 220
 221 void wxTextEntry::Undo()
 222 {
 223     ::SendMessage(GetEditHwnd(), EM_UNDO, 0, 0);
 224 }
 225
 226 void wxTextEntry::Redo()
 227 {
 228     // same as Undo, since Undo undoes the undo
 229     Undo();
 230     return;
 231 }
 232
 233 bool wxTextEntry::CanUndo() const
 234 {
 235     return ::SendMessage(GetEditHwnd(), EM_CANUNDO, 0, 0) != 0;
 236 }
 237
 238 bool wxTextEntry::CanRedo() const
 239 {
 240     // see comment in Redo()
 241     return CanUndo();
 242 }
 243
 244 // ----------------------------------------------------------------------------
 245 // insertion point and selection
 246 // ----------------------------------------------------------------------------
 247
 248 void wxTextEntry::SetInsertionPoint(long pos)
 249 {
 250     // calling DoSetSelection(-1, -1) would select everything which is not what
 251     // we want here
 252     if ( pos == -1 )
 253         pos = GetLastPosition();
 254
 255     // be careful to call DoSetSelection() which is overridden in wxTextCtrl
 256     // and not just SetSelection() here
 257     DoSetSelection(pos, pos);
 258 }
 259
 260 long wxTextEntry::GetInsertionPoint() const
 261 {
 262     long from;
 263     GetSelection(&from, NULL);
 264     return from;
 265 }
 266
 267 long wxTextEntry::GetLastPosition() const
 268 {
 269     return ::SendMessage(GetEditHwnd(), EM_LINELENGTH, 0, 0);
 270 }
 271
 272 void wxTextEntry::DoSetSelection(long from, long to, int WXUNUSED(flags))
 273 {
 274     // if from and to are both -1, it means (in wxWidgets) that all text should
 275     // be selected, translate this into Windows convention
 276     if ( (from == -1) && (to == -1) )
 277     {
 278         from = 0;
 279     }
 280
 281     ::SendMessage(GetEditHwnd(), EM_SETSEL, from, to);
 282 }
 283
 284 void wxTextEntry::GetSelection(long *from, long *to) const
 285 {
 286     DWORD dwStart, dwEnd;
 287     ::SendMessage(GetEditHwnd(), EM_GETSEL, (WPARAM)&dwStart, (LPARAM)&dwEnd);
 288
 289     if ( from )
 290         *from = dwStart;
 291     if ( to )
 292         *to = dwEnd;
 293 }
 294
 295 // ----------------------------------------------------------------------------
 296 // auto-completion
 297 // ----------------------------------------------------------------------------
 298
 299 #if wxUSE_OLE
 300 bool wxTextEntry::AutoCompleteFileNames()
 301 {
 302 #ifdef HAS_AUTOCOMPLETE
 303     typedef HRESULT (WINAPI *SHAutoComplete_t)(HWND, DWORD);
 304     static SHAutoComplete_t s_pfnSHAutoComplete = (SHAutoComplete_t)-1;
 305     static wxDynamicLibrary s_dllShlwapi;
 306     if ( s_pfnSHAutoComplete == (SHAutoComplete_t)-1 )
 307     {
 308         if ( !s_dllShlwapi.Load(_T("shlwapi.dll"), wxDL_VERBATIM | wxDL_QUIET) )
 309         {
 310             s_pfnSHAutoComplete = NULL;
 311         }
 312         else
 313         {
 314             wxDL_INIT_FUNC(s_pfn, SHAutoComplete, s_dllShlwapi);
 315         }
 316     }
 317
 318     if ( !s_pfnSHAutoComplete )
 319         return false;
 320
 321     HRESULT hr = (*s_pfnSHAutoComplete)(GetEditHwnd(), SHACF_FILESYS_ONLY);
 322     if ( FAILED(hr) )
 323     {
 324         wxLogApiError(_T("SHAutoComplete()"), hr);
 325
 326         return false;
 327     }
 328     return true;
 329 #else // !HAS_AUTOCOMPLETE
 330     return false;
 331 #endif // HAS_AUTOCOMPLETE/!HAS_AUTOCOMPLETE
 332 }
 333
 334 bool wxTextEntry::AutoComplete(const wxArrayString& choices)
 335 {
 336 #ifdef HAS_AUTOCOMPLETE
 337     // create an object exposing IAutoComplete interface (don't go for
 338     // IAutoComplete2 immediately as, presumably, it might be not available on
 339     // older systems as otherwise why do we have both -- although in practice I
 340     // don't know when can this happen)
 341     IAutoComplete *pAutoComplete = NULL;
 342     HRESULT hr = CoCreateInstance
 343                  (
 344                     CLSID_AutoComplete,
 345                     NULL,
 346                     CLSCTX_INPROC_SERVER,
 347                     IID_IAutoComplete,
 348                     reinterpret_cast<void **>(&pAutoComplete)
 349                  );
 350     if ( FAILED(hr) )
 351     {
 352         wxLogApiError(_T("CoCreateInstance(CLSID_AutoComplete)"), hr);
 353         return false;
 354     }
 355
 356     // associate it with our strings
 357     wxIEnumString *pEnumString = new wxIEnumString(choices);
 358     pEnumString->AddRef();
 359     hr = pAutoComplete->Init(GetEditHwnd(), pEnumString, NULL, NULL);
 360     pEnumString->Release();
 361     if ( FAILED(hr) )
 362     {
 363         wxLogApiError(_T("IAutoComplete::Init"), hr);
 364         return false;
 365     }
 366
 367     // if IAutoComplete2 is available, set more user-friendly options
 368     IAutoComplete2 *pAutoComplete2 = NULL;
 369     hr = pAutoComplete->QueryInterface
 370                         (
 371                            IID_IAutoComplete2,
 372                            reinterpret_cast<void **>(&pAutoComplete2)
 373                         );
 374     if ( SUCCEEDED(hr) )
 375     {
 376         pAutoComplete2->SetOptions(ACO_AUTOSUGGEST | ACO_UPDOWNKEYDROPSLIST);
 377         pAutoComplete2->Release();
 378     }
 379
 380     // the docs are unclear about when can we release it but it seems safe to
 381     // do it immediately, presumably the edit control itself keeps a reference
 382     // to the auto completer object
 383     pAutoComplete->Release();
 384     return true;
 385 #else // !HAS_AUTOCOMPLETE
 386     wxUnusedVar(choices);
 387
 388     return false;
 389 #endif // HAS_AUTOCOMPLETE/!HAS_AUTOCOMPLETE
 390 }
 391 #endif // wxUSE_OLE
 392
 393 // ----------------------------------------------------------------------------
 394 // editable state
 395 // ----------------------------------------------------------------------------
 396
 397 bool wxTextEntry::IsEditable() const
 398 {
 399     return !(::GetWindowLong(GetEditHwnd(), GWL_STYLE) & ES_READONLY);
 400 }
 401
 402 void wxTextEntry::SetEditable(bool editable)
 403 {
 404     ::SendMessage(GetEditHwnd(), EM_SETREADONLY, !editable, 0);
 405 }
 406
 407 // ----------------------------------------------------------------------------
 408 // max length
 409 // ----------------------------------------------------------------------------
 410
 411 void wxTextEntry::SetMaxLength(unsigned long len)
 412 {
 413     if ( len >= 0xffff )
 414     {
 415         // this will set it to a platform-dependent maximum (much more
 416         // than 64Kb under NT)
 417         len = 0;
 418     }
 419
 420     ::SendMessage(GetEditHwnd(), EM_LIMITTEXT, len, 0);
 421 }
 422
 423 // ----------------------------------------------------------------------------
 424 // hints
 425 // ----------------------------------------------------------------------------
 426
 427 #if wxUSE_UXTHEME
 428
 429 #ifndef EM_SETCUEBANNER
 430     #define EM_SETCUEBANNER 0x1501
 431     #define EM_GETCUEBANNER 0x1502
 432 #endif
 433
 434 bool wxTextEntry::SetHint(const wxString& hint)
 435 {
 436     if ( wxUxThemeEngine::GetIfActive() )
 437     {
 438         // notice that this message always works with Unicode strings
 439         if ( ::SendMessage(GetEditHwnd(), EM_SETCUEBANNER,
 440                              0, (LPARAM)(const wchar_t *)hint.wc_str()) )
 441             return true;
 442     }
 443
 444     return wxTextEntryBase::SetHint(hint);
 445 }
 446
 447 wxString wxTextEntry::GetHint() const
 448 {
 449     if ( wxUxThemeEngine::GetIfActive() )
 450     {
 451         wchar_t buf[256];
 452         if ( ::SendMessage(GetEditHwnd(), EM_GETCUEBANNER,
 453                             (WPARAM)buf, WXSIZEOF(buf)) )
 454             return buf;
 455     }
 456
 457     return wxTextEntryBase::GetHint();
 458 }
 459
 460
 461 #endif // wxUSE_UXTHEME
 462
 463 #endif // wxUSE_TEXTCTRL || wxUSE_COMBOBOX