src/msw/combobox.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifdef __GNUG__
  13 #pragma implementation "combobox.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #if wxUSE_COMBOBOX
  24
  25 #ifndef WX_PRECOMP
  26 #include "wx/settings.h"
  27 #endif
  28
  29 #include "wx/combobox.h"
  30 #include "wx/clipbrd.h"
  31 #include "wx/msw/private.h"
  32
  33 IMPLEMENT_DYNAMIC_CLASS(wxComboBox, wxControl)
  34
  35 bool wxComboBox::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
  36 {
  37     switch ( param )
  38     {
  39         case CBN_SELCHANGE:
  40             if (GetSelection() > -1)
  41             {
  42                 wxCommandEvent event(wxEVT_COMMAND_COMBOBOX_SELECTED, GetId());
  43                 event.SetInt(GetSelection());
  44                 event.SetEventObject(this);
  45                 event.SetString(GetStringSelection());
  46                 ProcessCommand(event);
  47             }
  48             break;
  49
  50         case CBN_EDITCHANGE:
  51             {
  52                 wxCommandEvent event(wxEVT_COMMAND_TEXT_UPDATED, GetId());
  53                 event.SetString(GetValue());
  54                 event.SetEventObject(this);
  55                 ProcessCommand(event);
  56             }
  57             break;
  58     }
  59
  60     // there is no return value for the CBN_ notifications, so always return
  61     // FALSE from here to pass the message to DefWindowProc()
  62     return FALSE;
  63 }
  64
  65 bool wxComboBox::Create(wxWindow *parent, wxWindowID id,
  66                         const wxString& value,
  67                         const wxPoint& pos,
  68                         const wxSize& size,
  69                         int n, const wxString choices[],
  70                         long style,
  71                         const wxValidator& validator,
  72                         const wxString& name)
  73 {
  74   SetName(name);
  75 #if wxUSE_VALIDATORS
  76   SetValidator(validator);
  77 #endif // wxUSE_VALIDATORS
  78   if (parent) parent->AddChild(this);
  79 //  SetBackgroundColour(parent->GetBackgroundColour()) ;
  80
  81   // A choice/combobox normally has a white background (or other, depending
  82   // on global settings) rather than inheriting the parent's background colour.
  83   SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_WINDOW));
  84
  85   SetForegroundColour(parent->GetForegroundColour()) ;
  86
  87   m_windowStyle = style;
  88
  89   if ( id == -1 )
  90     m_windowId = (int)NewControlId();
  91   else
  92     m_windowId = id;
  93
  94   int x = pos.x;
  95   int y = pos.y;
  96   int width = size.x;
  97   int height = size.y;
  98
  99   long msStyle = WS_CHILD | WS_TABSTOP | WS_VISIBLE |
 100                  WS_VSCROLL | WS_HSCROLL | CBS_AUTOHSCROLL | CBS_NOINTEGRALHEIGHT;
 101
 102   if (m_windowStyle & wxCB_READONLY)
 103     msStyle |= CBS_DROPDOWNLIST;
 104   else if (m_windowStyle & wxCB_SIMPLE)
 105     msStyle |= CBS_SIMPLE; // A list (shown always) and edit control
 106   else
 107     msStyle |= CBS_DROPDOWN;
 108
 109   if (m_windowStyle & wxCB_SORT)
 110     msStyle |= CBS_SORT;
 111
 112   bool want3D;
 113   WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D) ;
 114
 115   // Even with extended styles, need to combine with WS_BORDER
 116   // for them to look right.
 117   if ( want3D || wxStyleHasBorder(m_windowStyle) )
 118     msStyle |= WS_BORDER;
 119
 120   m_hWnd = (WXHWND)::CreateWindowEx(exStyle, wxT("COMBOBOX"), NULL,
 121                    msStyle,
 122                    0, 0, 0, 0, (HWND) parent->GetHWND(), (HMENU)m_windowId,
 123                    wxGetInstance(), NULL);
 124
 125   wxCHECK_MSG( m_hWnd, FALSE, wxT("Failed to create combobox") );
 126
 127 /*
 128 #if wxUSE_CTL3D
 129   if (want3D)
 130   {
 131     Ctl3dSubclassCtl(wx_combo);
 132     m_useCtl3D = TRUE;
 133   }
 134 #endif
 135 */
 136
 137   // Subclass again for purposes of dialog editing mode
 138   SubclassWin(m_hWnd);
 139
 140   SetFont(parent->GetFont());
 141   int i;
 142   for (i = 0; i < n; i++)
 143   {
 144     Append(choices[i]);
 145   }
 146
 147   SetSelection(i);
 148
 149   SetSize(x, y, width, height);
 150   if ( !value.IsEmpty() )
 151   {
 152     SetValue(value);
 153   }
 154
 155   return TRUE;
 156 }
 157
 158 void wxComboBox::SetValue(const wxString& value)
 159 {
 160   // If newlines are denoted by just 10, must stick 13 in front.
 161   int singletons = 0;
 162   int len = value.Length();
 163   int i;
 164   for (i = 0; i < len; i ++)
 165   {
 166     if ((i > 0) && (value[i] == 10) && (value[i-1] != 13))
 167       singletons ++;
 168   }
 169   if (singletons > 0)
 170   {
 171     wxChar *tmp = new wxChar[len + singletons + 1];
 172     int j = 0;
 173     for (i = 0; i < len; i ++)
 174     {
 175       if ((i > 0) && (value[i] == 10) && (value[i-1] != 13))
 176       {
 177         tmp[j] = 13;
 178         j ++;
 179       }
 180       tmp[j] = value[i];
 181       j ++;
 182     }
 183     tmp[j] = 0;
 184     SetWindowText(GetHwnd(), tmp);
 185     delete[] tmp;
 186   }
 187   else
 188     SetWindowText(GetHwnd(), value);
 189 }
 190
 191 // Clipboard operations
 192 void wxComboBox::Copy()
 193 {
 194   HWND hWnd = GetHwnd();
 195   SendMessage(hWnd, WM_COPY, 0, 0L);
 196 }
 197
 198 void wxComboBox::Cut()
 199 {
 200   HWND hWnd = GetHwnd();
 201   SendMessage(hWnd, WM_CUT, 0, 0L);
 202 }
 203
 204 void wxComboBox::Paste()
 205 {
 206   HWND hWnd = GetHwnd();
 207   SendMessage(hWnd, WM_PASTE, 0, 0L);
 208 }
 209
 210 void wxComboBox::SetEditable(bool editable)
 211 {
 212   // Can't implement in MSW?
 213 //  HWND hWnd = GetHwnd();
 214 //  SendMessage(hWnd, EM_SETREADONLY, (WPARAM)!editable, (LPARAM)0L);
 215 }
 216
 217 void wxComboBox::SetInsertionPoint(long pos)
 218 {
 219 /*
 220   HWND hWnd = GetHwnd();
 221 #ifdef __WIN32__
 222   SendMessage(hWnd, EM_SETSEL, pos, pos);
 223   SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 224 #else
 225   SendMessage(hWnd, EM_SETSEL, 0, MAKELPARAM(pos, pos));
 226 #endif
 227   char *nothing = "";
 228   SendMessage(hWnd, EM_REPLACESEL, 0, (LPARAM)nothing);
 229 */
 230 }
 231
 232 void wxComboBox::SetInsertionPointEnd()
 233 {
 234 /*
 235   long pos = GetLastPosition();
 236   SetInsertionPoint(pos);
 237 */
 238 }
 239
 240 long wxComboBox::GetInsertionPoint() const
 241 {
 242 /*
 243   DWORD Pos=(DWORD)SendMessage(GetHwnd(), EM_GETSEL, 0, 0L);
 244   return Pos&0xFFFF;
 245 */
 246   return 0;
 247 }
 248
 249 long wxComboBox::GetLastPosition() const
 250 {
 251 /*
 252     HWND hWnd = GetHwnd();
 253
 254     // Will always return a number > 0 (according to docs)
 255     int noLines = (int)SendMessage(hWnd, EM_GETLINECOUNT, (WPARAM)0, (LPARAM)0L);
 256
 257     // This gets the char index for the _beginning_ of the last line
 258     int charIndex = (int)SendMessage(hWnd, EM_LINEINDEX, (WPARAM)(noLines-1), (LPARAM)0L);
 259
 260     // Get number of characters in the last line. We'll add this to the character
 261     // index for the last line, 1st position.
 262     int lineLength = (int)SendMessage(hWnd, EM_LINELENGTH, (WPARAM)charIndex, (LPARAM)0L);
 263
 264     return (long)(charIndex + lineLength);
 265 */
 266   return 0;
 267 }
 268
 269 void wxComboBox::Replace(long from, long to, const wxString& value)
 270 {
 271 #if wxUSE_CLIPBOARD
 272     HWND hWnd = GetHwnd();
 273     long fromChar = from;
 274     long toChar = to;
 275
 276     // Set selection and remove it
 277 #ifdef __WIN32__
 278     SendMessage(hWnd, CB_SETEDITSEL, fromChar, toChar);
 279 #else
 280     SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 281 #endif
 282     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 283
 284     // Now replace with 'value', by pasting.
 285     wxSetClipboardData(wxDF_TEXT, (wxObject *)(const wxChar *)value, 0, 0);
 286
 287     // Paste into edit control
 288     SendMessage(hWnd, WM_PASTE, (WPARAM)0, (LPARAM)0L);
 289 #endif
 290 }
 291
 292 void wxComboBox::Remove(long from, long to)
 293 {
 294     HWND hWnd = GetHwnd();
 295     long fromChar = from;
 296     long toChar = to;
 297
 298     // Cut all selected text
 299 #ifdef __WIN32__
 300     SendMessage(hWnd, CB_SETEDITSEL, fromChar, toChar);
 301 #else
 302     SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 303 #endif
 304     SendMessage(hWnd, WM_CUT, (WPARAM)0, (LPARAM)0);
 305 }
 306
 307 void wxComboBox::SetSelection(long from, long to)
 308 {
 309     HWND hWnd = GetHwnd();
 310     long fromChar = from;
 311     long toChar = to;
 312     // if from and to are both -1, it means
 313     // (in wxWindows) that all text should be selected.
 314     // This translates into Windows convention
 315     if ((from == -1) && (to == -1))
 316     {
 317       fromChar = 0;
 318       toChar = -1;
 319     }
 320
 321 #ifdef __WIN32__
 322     SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)fromChar, (LPARAM)toChar);
 323 //    SendMessage(hWnd, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0);
 324 #else
 325     // WPARAM is 0: selection is scrolled into view
 326     SendMessage(hWnd, CB_SETEDITSEL, (WPARAM)0, (LPARAM)MAKELONG(fromChar, toChar));
 327 #endif
 328 }
 329
 330 void wxComboBox::DoMoveWindow(int x, int y, int width, int height)
 331 {
 332     int cx, cy;
 333     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 334
 335     // what should the height of the drop down list be? we choose 10 items by
 336     // default and also 10 items max (if we always use n, the list will never
 337     // have vertical scrollbar)
 338     int n = GetCount();
 339     if ( !n )
 340         n = 10;
 341     else if ( n > 10 )
 342         n = 10;
 343
 344     height = n * EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy);
 345
 346     wxControl::DoMoveWindow(x, y, width, height);
 347 }
 348
 349 wxSize wxComboBox::DoGetBestSize() const
 350 {
 351     // the choice calculates the horz size correctly, but not the vertical
 352     // component: correct it
 353     wxSize size = wxChoice::DoGetBestSize();
 354
 355     int cx, cy;
 356     wxGetCharSize(GetHWND(), &cx, &cy, &GetFont());
 357     size.y = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy);
 358
 359     return size;
 360 }
 361
 362 #endif
 363  // wxUSE_COMBOBOX
 364