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