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 #define GetEditHwnd() ((HWND)(GetEditHWND()))
  39
  40 // ----------------------------------------------------------------------------
  41 // wxIEnumString implements IEnumString interface
  42 // ----------------------------------------------------------------------------
  43
  44 // standard VC6 SDK (WINVER == 0x0400) does not know about IAutoComplete
  45 #if wxUSE_OLE && (WINVER >= 0x0500)
  46     #define HAS_AUTOCOMPLETE
  47 #endif
  48
  49 #ifdef HAS_AUTOCOMPLETE
  50
  51 #include "wx/msw/ole/oleutils.h"
  52 #include <shldisp.h>
  53
  54 #if defined(__MINGW32__)
  55     // needed for IID_IAutoComplete, IID_IAutoComplete2 and ACO_AUTOSUGGEST
  56     #include <shlguid.h>
  57 #endif
  58
  59 #ifndef ACO_UPDOWNKEYDROPSLIST
  60     #define ACO_UPDOWNKEYDROPSLIST 0x20
  61 #endif
  62
  63 #ifndef SHACF_FILESYS_ONLY
  64     #define SHACF_FILESYS_ONLY 0x00000010
  65 #endif
  66
  67 DEFINE_GUID(CLSID_AutoComplete,
  68     0x00bb2763, 0x6a77, 0x11d0, 0xa5, 0x35, 0x00, 0xc0, 0x4f, 0xd7, 0xd0, 0x62);
  69
  70 class wxIEnumString : public IEnumString
  71 {
  72 public:
  73     wxIEnumString(const wxArrayString& strings) : m_strings(strings)
  74     {
  75         m_index = 0;
  76     }
  77
  78     DECLARE_IUNKNOWN_METHODS;
  79
  80     virtual HRESULT STDMETHODCALLTYPE Next(ULONG celt,
  81                                            LPOLESTR *rgelt,
  82                                            ULONG *pceltFetched)
  83     {
  84         if ( !rgelt || (!pceltFetched && celt > 1) )
  85             return E_POINTER;
  86
  87         ULONG pceltFetchedDummy;
  88         if ( !pceltFetched )
  89             pceltFetched = &pceltFetchedDummy;
  90
  91         *pceltFetched = 0;
  92
  93         for ( const unsigned count = m_strings.size(); celt--; ++m_index )
  94         {
  95             if ( m_index == count )
  96                 return S_FALSE;
  97
  98             const wxWX2WCbuf wcbuf = m_strings[m_index].wc_str();
  99             const size_t size = (wcslen(wcbuf) + 1)*sizeof(wchar_t);
 100             void *olestr = CoTaskMemAlloc(size);
 101             if ( !olestr )
 102                 return E_OUTOFMEMORY;
 103
 104             memcpy(olestr, wcbuf, size);
 105
 106             *rgelt++ = wx_static_cast(LPOLESTR, olestr);
 107
 108             ++(*pceltFetched);
 109         }
 110
 111         return S_OK;
 112     }
 113
 114     virtual HRESULT STDMETHODCALLTYPE Skip(ULONG celt)
 115     {
 116         m_index += celt;
 117         if ( m_index > m_strings.size() )
 118         {
 119             m_index = m_strings.size();
 120             return S_FALSE;
 121         }
 122
 123         return S_OK;
 124     }
 125
 126     virtual HRESULT STDMETHODCALLTYPE Reset()
 127     {
 128         m_index = 0;
 129
 130         return S_OK;
 131     }
 132
 133     virtual HRESULT STDMETHODCALLTYPE Clone(IEnumString **ppEnum)
 134     {
 135         if ( !ppEnum )
 136             return E_POINTER;
 137
 138         wxIEnumString *e = new wxIEnumString(m_strings);
 139         e->m_index = m_index;
 140
 141         e->AddRef();
 142         *ppEnum = e;
 143
 144         return S_OK;
 145     }
 146
 147 private:
 148     // dtor doesn't have to be virtual as we're only ever deleted from our own
 149     // Release() and are not meant to be derived form anyhow, but making it
 150     // virtual silences gcc warnings; making it private makes it impossible to
 151     // (mistakenly) delete us directly instead of calling Release()
 152     virtual ~wxIEnumString() { }
 153
 154
 155     const wxArrayString m_strings;
 156     unsigned m_index;
 157
 158     DECLARE_NO_COPY_CLASS(wxIEnumString)
 159 };
 160
 161 BEGIN_IID_TABLE(wxIEnumString)
 162     ADD_IID(Unknown)
 163     ADD_IID(EnumString)
 164 END_IID_TABLE;
 165
 166 IMPLEMENT_IUNKNOWN_METHODS(wxIEnumString)
 167
 168 #endif // HAS_AUTOCOMPLETE
 169
 170 // ============================================================================
 171 // wxTextEntry implementation
 172 // ============================================================================
 173
 174 // ----------------------------------------------------------------------------
 175 // operations on text
 176 // ----------------------------------------------------------------------------
 177
 178 void wxTextEntry::WriteText(const wxString& text)
 179 {
 180     ::SendMessage(GetEditHwnd(), EM_REPLACESEL, 0, (LPARAM)text.wx_str());
 181 }
 182
 183 wxString wxTextEntry::GetValue() const
 184 {
 185     return wxGetWindowText(GetEditHWND());
 186 }
 187
 188 void wxTextEntry::Remove(long from, long to)
 189 {
 190     DoSetSelection(from, to, SetSel_NoScroll);
 191     WriteText(wxString());
 192 }
 193
 194 // ----------------------------------------------------------------------------
 195 // clipboard operations
 196 // ----------------------------------------------------------------------------
 197
 198 void wxTextEntry::Copy()
 199 {
 200     ::SendMessage(GetEditHwnd(), WM_COPY, 0, 0);
 201 }
 202
 203 void wxTextEntry::Cut()
 204 {
 205     ::SendMessage(GetEditHwnd(), WM_CUT, 0, 0);
 206 }
 207
 208 void wxTextEntry::Paste()
 209 {
 210     ::SendMessage(GetEditHwnd(), WM_PASTE, 0, 0);
 211 }
 212
 213 // ----------------------------------------------------------------------------
 214 // undo/redo
 215 // ----------------------------------------------------------------------------
 216
 217 void wxTextEntry::Undo()
 218 {
 219     ::SendMessage(GetEditHwnd(), EM_UNDO, 0, 0);
 220 }
 221
 222 void wxTextEntry::Redo()
 223 {
 224     // same as Undo, since Undo undoes the undo
 225     Undo();
 226     return;
 227 }
 228
 229 bool wxTextEntry::CanUndo() const
 230 {
 231     return ::SendMessage(GetEditHwnd(), EM_CANUNDO, 0, 0) != 0;
 232 }
 233
 234 bool wxTextEntry::CanRedo() const
 235 {
 236     // see comment in Redo()
 237     return CanUndo();
 238 }
 239
 240 // ----------------------------------------------------------------------------
 241 // insertion point and selection
 242 // ----------------------------------------------------------------------------
 243
 244 void wxTextEntry::SetInsertionPoint(long pos)
 245 {
 246     // be careful to call DoSetSelection() which is overridden in wxTextCtrl
 247     // and not just SetSelection() here
 248     DoSetSelection(pos, pos);
 249 }
 250
 251 long wxTextEntry::GetInsertionPoint() const
 252 {
 253     long from;
 254     GetSelection(&from, NULL);
 255     return from;
 256 }
 257
 258 long wxTextEntry::GetLastPosition() const
 259 {
 260     return ::SendMessage(GetEditHwnd(), EM_LINELENGTH, 0, 0);
 261 }
 262
 263 void wxTextEntry::DoSetSelection(long from, long to, int WXUNUSED(flags))
 264 {
 265     // if from and to are both -1, it means (in wxWidgets) that all text should
 266     // be selected, translate this into Windows convention
 267     if ( (from == -1) && (to == -1) )
 268     {
 269         from = 0;
 270     }
 271
 272     ::SendMessage(GetEditHwnd(), EM_SETSEL, from, to);
 273 }
 274
 275 void wxTextEntry::GetSelection(long *from, long *to) const
 276 {
 277     DWORD dwStart, dwEnd;
 278     ::SendMessage(GetEditHwnd(), EM_GETSEL, (WPARAM)&dwStart, (LPARAM)&dwEnd);
 279
 280     if ( from )
 281         *from = dwStart;
 282     if ( to )
 283         *to = dwEnd;
 284 }
 285
 286 // ----------------------------------------------------------------------------
 287 // auto-completion
 288 // ----------------------------------------------------------------------------
 289
 290 bool wxTextEntry::AutoCompleteFileNames()
 291 {
 292 #ifdef HAS_AUTOCOMPLETE
 293     typedef HRESULT (WINAPI *SHAutoComplete_t)(HWND, DWORD);
 294     static SHAutoComplete_t s_pfnSHAutoComplete = (SHAutoComplete_t)-1;
 295     static wxDynamicLibrary s_dllShlwapi;
 296     if ( s_pfnSHAutoComplete == (SHAutoComplete_t)-1 )
 297     {
 298         wxLogNull noLog;
 299
 300         if ( !s_dllShlwapi.Load(_T("shlwapi.dll"), wxDL_VERBATIM) )
 301         {
 302             s_pfnSHAutoComplete = NULL;
 303         }
 304         else
 305         {
 306             wxDL_INIT_FUNC(s_pfn, SHAutoComplete, s_dllShlwapi);
 307         }
 308     }
 309
 310     if ( !s_pfnSHAutoComplete )
 311         return false;
 312
 313     HRESULT hr = (*s_pfnSHAutoComplete)(GetEditHwnd(), SHACF_FILESYS_ONLY);
 314     if ( FAILED(hr) )
 315     {
 316         wxLogApiError(_T("SHAutoComplete()"), hr);
 317
 318         return false;
 319     }
 320     return true;
 321 #else // !HAS_AUTOCOMPLETE
 322     return false;
 323 #endif // HAS_AUTOCOMPLETE/!HAS_AUTOCOMPLETE
 324 }
 325
 326 bool wxTextEntry::AutoComplete(const wxArrayString& choices)
 327 {
 328 #ifdef HAS_AUTOCOMPLETE
 329     // create an object exposing IAutoComplete interface (don't go for
 330     // IAutoComplete2 immediately as, presumably, it might be not available on
 331     // older systems as otherwise why do we have both -- although in practice I
 332     // don't know when can this happen)
 333     IAutoComplete *pAutoComplete = NULL;
 334     HRESULT hr = CoCreateInstance
 335                  (
 336                     CLSID_AutoComplete,
 337                     NULL,
 338                     CLSCTX_INPROC_SERVER,
 339                     IID_IAutoComplete,
 340                     wx_reinterpret_cast(void **, &pAutoComplete)
 341                  );
 342     if ( FAILED(hr) )
 343     {
 344         wxLogApiError(_T("CoCreateInstance(CLSID_AutoComplete)"), hr);
 345         return false;
 346     }
 347
 348     // associate it with our strings
 349     wxIEnumString *pEnumString = new wxIEnumString(choices);
 350     pEnumString->AddRef();
 351     hr = pAutoComplete->Init(GetEditHwnd(), pEnumString, NULL, NULL);
 352     pEnumString->Release();
 353     if ( FAILED(hr) )
 354     {
 355         wxLogApiError(_T("IAutoComplete::Init"), hr);
 356         return false;
 357     }
 358
 359     // if IAutoComplete2 is available, set more user-friendly options
 360     IAutoComplete2 *pAutoComplete2 = NULL;
 361     hr = pAutoComplete->QueryInterface
 362                         (
 363                            IID_IAutoComplete2,
 364                            wx_reinterpret_cast(void **, &pAutoComplete2)
 365                         );
 366     if ( SUCCEEDED(hr) )
 367     {
 368         pAutoComplete2->SetOptions(ACO_AUTOSUGGEST | ACO_UPDOWNKEYDROPSLIST);
 369         pAutoComplete2->Release();
 370     }
 371
 372     // the docs are unclear about when can we release it but it seems safe to
 373     // do it immediately, presumably the edit control itself keeps a reference
 374     // to the auto completer object
 375     pAutoComplete->Release();
 376     return true;
 377 #else // !HAS_AUTOCOMPLETE
 378     return false;
 379 #endif // HAS_AUTOCOMPLETE/!HAS_AUTOCOMPLETE
 380 }
 381
 382 // ----------------------------------------------------------------------------
 383 // editable state
 384 // ----------------------------------------------------------------------------
 385
 386 bool wxTextEntry::IsEditable() const
 387 {
 388     return !(::GetWindowLong(GetEditHwnd(), GWL_STYLE) & ES_READONLY);
 389 }
 390
 391 void wxTextEntry::SetEditable(bool editable)
 392 {
 393     ::SendMessage(GetEditHwnd(), EM_SETREADONLY, !editable, 0);
 394 }
 395
 396 // ----------------------------------------------------------------------------
 397 // max length
 398 // ----------------------------------------------------------------------------
 399
 400 void wxTextEntry::SetMaxLength(unsigned long len)
 401 {
 402     if ( len >= 0xffff )
 403     {
 404         // this will set it to a platform-dependent maximum (much more
 405         // than 64Kb under NT)
 406         len = 0;
 407     }
 408
 409     ::SendMessage(GetEditHwnd(), EM_LIMITTEXT, len, 0);
 410 }
 411
 412 #endif // wxUSE_TEXTCTRL || wxUSE_COMBOBOX