src/msw/choice.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        choice.cpp
   3 // Purpose:     wxChoice
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "choice.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 #ifndef WX_PRECOMP
  24 #include "wx/choice.h"
  25 #include "wx/utils.h"
  26 #endif
  27
  28 #include "wx/msw/private.h"
  29
  30 #if !USE_SHARED_LIBRARY
  31 IMPLEMENT_DYNAMIC_CLASS(wxChoice, wxControl)
  32 #endif
  33
  34 bool wxChoice::MSWCommand(WXUINT param, WXWORD WXUNUSED(id))
  35 {
  36   if (param == CBN_SELCHANGE)
  37   {
  38     wxCommandEvent event(wxEVT_COMMAND_CHOICE_SELECTED, m_windowId);
  39     event.SetInt(GetSelection());
  40     event.SetEventObject(this);
  41     event.SetString(GetStringSelection());
  42     ProcessCommand(event);
  43
  44     return TRUE;
  45   }
  46   else
  47       return FALSE;
  48 }
  49
  50 bool wxChoice::Create(wxWindow *parent, wxWindowID id,
  51            const wxPoint& pos,
  52            const wxSize& size,
  53        int n, const wxString choices[],
  54        long style,
  55            const wxValidator& validator,
  56            const wxString& name)
  57 {
  58   SetName(name);
  59   SetValidator(validator);
  60   if (parent) parent->AddChild(this);
  61   SetBackgroundColour(parent->GetBackgroundColour()) ;
  62   SetForegroundColour(parent->GetForegroundColour()) ;
  63   m_noStrings = 0;
  64
  65   m_windowStyle = style;
  66
  67   if ( id == -1 )
  68     m_windowId = (int)NewControlId();
  69   else
  70   m_windowId = id;
  71
  72   int x = pos.x;
  73   int y = pos.y;
  74   int width = size.x;
  75   int height = size.y;
  76
  77   long msStyle = WS_CHILD | CBS_DROPDOWNLIST | WS_HSCROLL | WS_VSCROLL
  78                    | WS_TABSTOP | WS_VISIBLE;
  79   if (m_windowStyle & wxCB_SORT)
  80     msStyle |= CBS_SORT;
  81
  82   bool want3D;
  83   WXDWORD exStyle = Determine3DEffects(WS_EX_CLIENTEDGE, &want3D) ;
  84
  85   // Even with extended styles, need to combine with WS_BORDER
  86   // for them to look right.
  87   if ( want3D || wxStyleHasBorder(m_windowStyle) )
  88     msStyle |= WS_BORDER;
  89
  90   m_hWnd = (WXHWND)::CreateWindowEx(exStyle, _T("COMBOBOX"), NULL,
  91                    msStyle,
  92                    0, 0, 0, 0, (HWND) parent->GetHWND(), (HMENU)m_windowId,
  93                    wxGetInstance(), NULL);
  94
  95   wxCHECK_MSG( m_hWnd, FALSE, _T("Failed to create combobox") );
  96
  97 /*
  98 #if wxUSE_CTL3D
  99   if (want3D)
 100   {
 101     m_useCtl3D = TRUE;
 102     Ctl3dSubclassCtl(wx_combo); // Does CTL3D affect the combobox? I think not.
 103   }
 104 #endif
 105 */
 106
 107   // Subclass again for purposes of dialog editing mode
 108   SubclassWin(m_hWnd);
 109
 110   SetFont(parent->GetFont());
 111
 112   int i;
 113   for (i = 0; i < n; i++)
 114   {
 115     Append(choices[i]);
 116   }
 117   SetSelection(n);
 118
 119   SetSize(x, y, width, height);
 120
 121   return TRUE;
 122 }
 123
 124 void wxChoice::Append(const wxString& item)
 125 {
 126   SendMessage((HWND) GetHWND(), CB_ADDSTRING, 0, (LONG)(const wxChar *)item);
 127
 128   m_noStrings ++;
 129 }
 130
 131 void wxChoice::Delete(int n)
 132 {
 133   m_noStrings = (int)SendMessage((HWND) GetHWND(), CB_DELETESTRING, n, 0);
 134 }
 135
 136 void wxChoice::Clear(void)
 137 {
 138   SendMessage((HWND) GetHWND(), CB_RESETCONTENT, 0, 0);
 139
 140   m_noStrings = 0;
 141 }
 142
 143
 144 int wxChoice::GetSelection(void) const
 145 {
 146   return (int)SendMessage((HWND) GetHWND(), CB_GETCURSEL, 0, 0);
 147 }
 148
 149 void wxChoice::SetSelection(int n)
 150 {
 151   SendMessage((HWND) GetHWND(), CB_SETCURSEL, n, 0);
 152 }
 153
 154 int wxChoice::FindString(const wxString& s) const
 155 {
 156 #if defined(__WATCOMC__) && defined(__WIN386__)
 157   // For some reason, Watcom in WIN386 mode crashes in the CB_FINDSTRINGEXACT message.
 158   // Do it the long way instead.
 159   char buf[512];
 160   for (int i = 0; i < Number(); i++)
 161   {
 162     int len = (int)SendMessage((HWND) GetHWND(), CB_GETLBTEXT, i, (LPARAM)(LPSTR)buf);
 163     buf[len] = 0;
 164     if (strcmp(buf, (const char *)s) == 0)
 165       return i;
 166   }
 167   return -1;
 168 #else
 169  int pos = (int)SendMessage((HWND) GetHWND(), CB_FINDSTRINGEXACT, (WPARAM)-1, (LPARAM)(LPSTR)(const wxChar *)s);
 170  if (pos == LB_ERR)
 171    return -1;
 172  else
 173    return pos;
 174 #endif
 175 }
 176
 177 wxString wxChoice::GetString(int n) const
 178 {
 179   int len = (int)SendMessage((HWND) GetHWND(), CB_GETLBTEXT, n, (long)wxBuffer);
 180   wxBuffer[len] = 0;
 181   return wxString(wxBuffer);
 182 }
 183
 184 void wxChoice::DoSetSize(int x, int y, int width, int height, int sizeFlags)
 185 {
 186   int currentX, currentY;
 187   GetPosition(&currentX, &currentY);
 188
 189   int x1 = x;
 190   int y1 = y;
 191   int w1 = width;
 192   int h1 = height;
 193
 194   if (x == -1 || (sizeFlags & wxSIZE_ALLOW_MINUS_ONE))
 195     x1 = currentX;
 196   if (y == -1 || (sizeFlags & wxSIZE_ALLOW_MINUS_ONE))
 197     y1 = currentY;
 198
 199   AdjustForParentClientOrigin(x1, y1, sizeFlags);
 200
 201   // If we're prepared to use the existing size, then...
 202   if (width == -1 && height == -1 && ((sizeFlags & wxSIZE_AUTO) != wxSIZE_AUTO))
 203   {
 204     GetSize(&w1, &h1);
 205   }
 206
 207   int cx; // button font dimensions
 208   int cy;
 209   wxGetCharSize(GetHWND(), &cx, &cy, & this->GetFont());
 210
 211   int control_width, control_height;
 212
 213   // Ignore height parameter because height doesn't
 214   // mean 'initially displayed' height, it refers to the
 215   // drop-down menu as well. The wxWindows interpretation
 216   // is different; also, getting the size returns the
 217   // _displayed_ size (NOT the drop down menu size)
 218   // so setting-getting-setting size would not work.
 219   h1 = -1;
 220
 221   // Deal with default size (using -1 values)
 222   if (width <= 0)
 223   {
 224     // Find the longest string
 225     if (m_noStrings == 0)
 226     {
 227       control_width = 100;
 228     }
 229     else
 230     {
 231       int len, ht;
 232       int longest = 0;
 233       int i;
 234       for (i = 0; i < m_noStrings; i++)
 235       {
 236         wxString str(GetString(i));
 237         GetTextExtent(str, &len, &ht, NULL, NULL, & this->GetFont());
 238         if ( len > longest)
 239             longest = len;
 240       }
 241
 242       control_width = longest + cx*5;
 243     }
 244   }
 245   else
 246   {
 247     // If non-default width...
 248     control_width = w1;
 249   }
 250
 251
 252   // Choice drop-down list depends on number of items (limited to 10)
 253   if (h1 <= 0)
 254   {
 255     if (m_noStrings == 0)
 256         h1 = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*10;
 257     else
 258         h1 = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy)*(wxMin(10, m_noStrings) + 1);
 259   }
 260
 261   control_height = h1;
 262
 263   // Calculations may have made text size too small
 264   if (control_height <= 0)
 265     control_height = EDIT_HEIGHT_FROM_CHAR_HEIGHT(cy);
 266
 267   if (control_width <= 0)
 268     control_width = 100;
 269
 270   MoveWindow((HWND)GetHWND(), x1, y1,
 271              control_width, control_height, TRUE);
 272 }
 273
 274 WXHBRUSH wxChoice::OnCtlColor(WXHDC pDC, WXHWND pWnd, WXUINT nCtlColor,
 275       WXUINT message, WXWPARAM wParam, WXLPARAM lParam)
 276 {
 277   return 0;
 278 }
 279
 280 long wxChoice::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
 281 {
 282     switch (nMsg)
 283     {
 284 /*
 285       case WM_GETDLGCODE:
 286       {
 287         if (GetWindowStyleFlag() & wxPROCESS_ENTER)
 288           return DLGC_WANTALLKEYS;
 289         break;
 290       }
 291 */
 292 /*
 293       case WM_CHAR: // Always an ASCII character
 294       {
 295         if (wParam == VK_RETURN)
 296         {
 297           wxCommandEvent event(wxEVENT_TYPE_TEXT_ENTER_COMMAND);
 298           event.commandString = ((wxTextCtrl *)item)->GetValue();
 299           event.eventObject = item;
 300           item->ProcessCommand(event);
 301           return FALSE;
 302         }
 303         break;
 304       }
 305 */
 306       case WM_LBUTTONUP:
 307       {
 308         int x = (int)LOWORD(lParam);
 309         int y = (int)HIWORD(lParam);
 310
 311        // Ok, this is truly weird, but if a panel with a wxChoice loses the
 312        // focus, then you get a *fake* WM_LBUTTONUP message
 313        // with x = 65535 and y = 65535.
 314        // Filter out this nonsense.
 315        if (x == 65535 && y == 65535)
 316          return 0;
 317        break;
 318       }
 319     }
 320
 321   return wxWindow::MSWWindowProc(nMsg, wParam, lParam);
 322 }
 323
 324 wxString wxChoice::GetStringSelection (void) const
 325 {
 326   int sel = GetSelection ();
 327   if (sel > -1)
 328     return wxString(this->GetString (sel));
 329   else
 330     return wxString(_T(""));
 331 }
 332
 333 bool wxChoice::SetStringSelection (const wxString& s)
 334 {
 335   int sel = FindString (s);
 336   if (sel > -1)
 337     {
 338       SetSelection (sel);
 339       return TRUE;
 340     }
 341   else
 342     return FALSE;
 343 }
 344
 345 void wxChoice::Command(wxCommandEvent & event)
 346 {
 347   SetSelection (event.GetInt());
 348   ProcessCommand (event);
 349 }
 350
 351
 352