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