src/msw/checklst.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/checklst.cpp
   3 // Purpose:     implementation of wxCheckListBox class
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     16.11.97
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
   9 // Licence:     wxWindows license
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21 #pragma implementation "checklst.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28 #pragma hdrstop
  29 #endif
  30
  31 #if wxUSE_OWNER_DRAWN
  32
  33 #ifndef WX_PRECOMP
  34     #include "wx/object.h"
  35     #include "wx/colour.h"
  36     #include "wx/font.h"
  37     #include "wx/bitmap.h"
  38     #include "wx/window.h"
  39     #include "wx/listbox.h"
  40     #include "wx/dcmemory.h"
  41
  42     #include "wx/settings.h"
  43
  44     #include "wx/log.h"
  45 #endif
  46
  47 #include "wx/ownerdrw.h"
  48 #include "wx/checklst.h"
  49
  50 #include <windows.h>
  51 #include <windowsx.h>
  52
  53 #if defined(__GNUWIN32_OLD__)
  54     #include "wx/msw/gnuwin32/extra.h"
  55 #endif
  56
  57 // ----------------------------------------------------------------------------
  58 // private functions
  59 // ----------------------------------------------------------------------------
  60
  61 // get item (converted to right type)
  62 #define GetItem(n)    ((wxCheckListBoxItem *)(GetItem(n)))
  63
  64 // ============================================================================
  65 // implementation
  66 // ============================================================================
  67
  68 IMPLEMENT_DYNAMIC_CLASS(wxCheckListBox, wxListBox)
  69
  70 // ----------------------------------------------------------------------------
  71 // declaration and implementation of wxCheckListBoxItem class
  72 // ----------------------------------------------------------------------------
  73
  74 class wxCheckListBoxItem : public wxOwnerDrawn
  75 {
  76 friend class wxCheckListBox;
  77 public:
  78   // ctor
  79   wxCheckListBoxItem(wxCheckListBox *pParent, size_t nIndex);
  80
  81   // drawing functions
  82   virtual bool OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus stat);
  83
  84   // simple accessors
  85   bool IsChecked() const  { return m_bChecked;        }
  86   void Check(bool bCheck);
  87   void Toggle() { Check(!IsChecked()); }
  88
  89 private:
  90   bool            m_bChecked;
  91   wxCheckListBox *m_pParent;
  92   size_t            m_nIndex;
  93 };
  94
  95 wxCheckListBoxItem::wxCheckListBoxItem(wxCheckListBox *pParent, size_t nIndex)
  96                   : wxOwnerDrawn("", TRUE)   // checkable
  97 {
  98   m_bChecked = FALSE;
  99   m_pParent  = pParent;
 100   m_nIndex   = nIndex;
 101
 102   // we don't initialize m_nCheckHeight/Width vars because it's
 103   // done in OnMeasure while they are used only in OnDraw and we
 104   // know that there will always be OnMeasure before OnDraw
 105
 106   // fix appearance
 107   SetMarginWidth(GetDefaultMarginWidth());
 108 }
 109
 110 /*
 111  * JACS - I've got the owner-draw stuff partially working with WIN16,
 112  * with a really horrible-looking cross for wxCheckListBox instead of a
 113  * check - could use a bitmap check-mark instead, defined in wx.rc.
 114  * Also there's a refresh problem whereby it doesn't always draw the
 115  * check until you click to the right of it, which is OK for WIN32.
 116  */
 117
 118 bool wxCheckListBoxItem::OnDrawItem(wxDC& dc, const wxRect& rc,
 119                                     wxODAction act, wxODStatus stat)
 120 {
 121   if ( IsChecked() )
 122     stat = (wxOwnerDrawn::wxODStatus)(stat | wxOwnerDrawn::wxODChecked);
 123
 124   if ( wxOwnerDrawn::OnDrawItem(dc, rc, act, stat) ) {
 125     // ## using native API for performance and precision
 126     size_t nCheckWidth  = GetDefaultMarginWidth(),
 127          nCheckHeight = m_pParent->GetItemHeight();
 128
 129     int x = rc.GetX(),
 130         y = rc.GetY();
 131
 132     HDC hdc = (HDC)dc.GetHDC();
 133
 134     // create pens
 135     HPEN hpenBack = CreatePen(PS_SOLID, 0, GetSysColor(COLOR_WINDOW)),
 136          hpenGray = CreatePen(PS_SOLID, 0, RGB(128, 128, 128)),
 137          hpenPrev = (HPEN)SelectObject(hdc, hpenBack);
 138
 139     // we erase the 1-pixel border
 140     Rectangle(hdc, x, y, x + nCheckWidth, y + nCheckHeight);
 141
 142     // shift check mark 1 pixel to the right (it looks better like this)
 143     x++;
 144
 145     if ( IsChecked() ) {
 146       // first create a monochrome bitmap in a memory DC
 147       HDC hdcMem = CreateCompatibleDC(hdc);
 148       HBITMAP hbmpCheck = CreateBitmap(nCheckWidth, nCheckHeight, 1, 1, 0);
 149       HBITMAP hbmpOld = (HBITMAP)SelectObject(hdcMem, hbmpCheck);
 150
 151       // then draw a check mark into it
 152 #if defined(__WIN32__) && !defined(__SC__)
 153       RECT rect;
 154       rect.left   = 0;
 155       rect.top    = 0;
 156       rect.right  = nCheckWidth;
 157       rect.bottom = nCheckHeight;
 158
 159       DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 160 #else
 161       // In WIN16, draw a cross
 162       HPEN blackPen = CreatePen(PS_SOLID, 1, RGB(0, 0, 0));
 163       HPEN whiteBrush = (HPEN)GetStockObject(WHITE_BRUSH);
 164       HPEN hPenOld = (HPEN)::SelectObject(hdcMem, blackPen);
 165       HPEN hBrushOld = (HPEN)::SelectObject(hdcMem, whiteBrush);
 166       ::SetROP2(hdcMem, R2_COPYPEN);
 167       Rectangle(hdcMem, 0, 0, nCheckWidth, nCheckHeight);
 168       MoveTo(hdcMem, 0, 0);
 169       LineTo(hdcMem, nCheckWidth, nCheckHeight);
 170       MoveTo(hdcMem, nCheckWidth, 0);
 171       LineTo(hdcMem, 0, nCheckHeight);
 172       ::SelectObject(hdcMem, hPenOld);
 173       ::SelectObject(hdcMem, hBrushOld);
 174       ::DeleteObject(blackPen);
 175 #endif
 176
 177       // finally copy it to screen DC and clean up
 178       BitBlt(hdc, x, y, nCheckWidth - 1, nCheckHeight,
 179              hdcMem, 0, 0, SRCCOPY);
 180
 181       SelectObject(hdcMem, hbmpOld);
 182       DeleteObject(hbmpCheck);
 183       DeleteDC(hdcMem);
 184     }
 185
 186     // now we draw the smaller rectangle
 187     y++;
 188     nCheckWidth  -= 2;
 189     nCheckHeight -= 2;
 190
 191     // draw hollow gray rectangle
 192     (void)SelectObject(hdc, hpenGray);
 193     HBRUSH hbrPrev  = (HBRUSH)SelectObject(hdc, GetStockObject(NULL_BRUSH));
 194     Rectangle(hdc, x, y, x + nCheckWidth, y + nCheckHeight);
 195
 196     // clean up
 197     (void)SelectObject(hdc, hpenPrev);
 198     (void)SelectObject(hdc, hbrPrev);
 199
 200     DeleteObject(hpenBack);
 201     DeleteObject(hpenGray);
 202
 203     /*
 204     dc.DrawRectangle(x, y, nCheckWidth, nCheckHeight);
 205
 206     if ( IsChecked() ) {
 207       dc.DrawLine(x, y, x + nCheckWidth, y + nCheckHeight);
 208       dc.DrawLine(x, y + nCheckHeight, x + nCheckWidth, y);
 209     }
 210     */
 211
 212     return TRUE;
 213   }
 214
 215   return FALSE;
 216 }
 217
 218 // change the state of the item and redraw it
 219 void wxCheckListBoxItem::Check(bool check)
 220 {
 221     m_bChecked = check;
 222
 223     // index may be chanegd because new items were added/deleted
 224     if ( m_pParent->GetItemIndex(this) != (int)m_nIndex )
 225     {
 226         // update it
 227         int index = m_pParent->GetItemIndex(this);
 228
 229         wxASSERT_MSG( index != wxNOT_FOUND, wxT("what does this item do here?") );
 230
 231         m_nIndex = (size_t)index;
 232     }
 233
 234     HWND hwndListbox = (HWND)m_pParent->GetHWND();
 235
 236     #ifdef __WIN32__
 237         RECT rcUpdate;
 238
 239         if ( ::SendMessage(hwndListbox, LB_GETITEMRECT,
 240                            m_nIndex, (LPARAM)&rcUpdate) == LB_ERR )
 241         {
 242             wxLogDebug(wxT("LB_GETITEMRECT failed"));
 243         }
 244     #else // Win16
 245         // FIXME this doesn't work if the listbox is scrolled!
 246         size_t nHeight = m_pParent->GetItemHeight();
 247         size_t y = m_nIndex * nHeight;
 248         RECT rcUpdate ;
 249         rcUpdate.left   = 0 ;
 250         rcUpdate.top    = y ;
 251         rcUpdate.right  = GetDefaultMarginWidth() ;
 252         rcUpdate.bottom = y + nHeight ;
 253     #endif  // Win32/16
 254
 255     InvalidateRect(hwndListbox, &rcUpdate, FALSE);
 256
 257     wxCommandEvent event(wxEVT_COMMAND_CHECKLISTBOX_TOGGLED, m_pParent->GetId());
 258     event.SetInt(m_nIndex);
 259     event.SetEventObject(m_pParent);
 260     m_pParent->ProcessCommand(event);
 261 }
 262
 263 // ----------------------------------------------------------------------------
 264 // implementation of wxCheckListBox class
 265 // ----------------------------------------------------------------------------
 266
 267 // define event table
 268 // ------------------
 269 BEGIN_EVENT_TABLE(wxCheckListBox, wxListBox)
 270   EVT_KEY_DOWN(wxCheckListBox::OnKeyDown)
 271   EVT_LEFT_DOWN(wxCheckListBox::OnLeftClick)
 272 END_EVENT_TABLE()
 273
 274 // control creation
 275 // ----------------
 276
 277 // def ctor: use Create() to really create the control
 278 wxCheckListBox::wxCheckListBox()
 279 {
 280 }
 281
 282 // ctor which creates the associated control
 283 wxCheckListBox::wxCheckListBox(wxWindow *parent, wxWindowID id,
 284                                const wxPoint& pos, const wxSize& size,
 285                                int nStrings, const wxString choices[],
 286                                long style, const wxValidator& val,
 287                                const wxString& name)
 288 {
 289     Create(parent, id, pos, size, nStrings, choices,
 290            style | wxLB_OWNERDRAW, val, name);
 291 }
 292
 293 void wxCheckListBox::Delete(int N)
 294 {
 295     wxCHECK_RET( N >= 0 && N < m_noItems,
 296                  wxT("invalid index in wxListBox::Delete") );
 297
 298     wxListBox::Delete(N);
 299
 300     // free memory
 301     delete m_aItems[N];
 302
 303     m_aItems.RemoveAt(N);
 304 }
 305
 306 bool wxCheckListBox::SetFont( const wxFont &font )
 307 {
 308     size_t i;
 309     for ( i = 0; i < m_aItems.GetCount(); i++ )
 310         m_aItems[i]->SetFont(font);
 311
 312     wxListBox::SetFont(font);
 313
 314     return TRUE;
 315 }
 316
 317 // create/retrieve item
 318 // --------------------
 319
 320 // create a check list box item
 321 wxOwnerDrawn *wxCheckListBox::CreateItem(size_t nIndex)
 322 {
 323   wxCheckListBoxItem *pItem = new wxCheckListBoxItem(this, nIndex);
 324   return pItem;
 325 }
 326
 327 // return item size
 328 // ----------------
 329 bool wxCheckListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 330 {
 331   if ( wxListBox::MSWOnMeasure(item) ) {
 332     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 333
 334     // save item height
 335     m_nItemHeight = pStruct->itemHeight;
 336
 337     // add place for the check mark
 338     pStruct->itemWidth += wxOwnerDrawn::GetDefaultMarginWidth();
 339
 340     return TRUE;
 341   }
 342
 343   return FALSE;
 344 }
 345
 346 // check items
 347 // -----------
 348
 349 bool wxCheckListBox::IsChecked(size_t uiIndex) const
 350 {
 351     wxCHECK_MSG( uiIndex < (size_t)GetCount(), FALSE, _T("bad wxCheckListBox index") );
 352
 353     return GetItem(uiIndex)->IsChecked();
 354 }
 355
 356 void wxCheckListBox::Check(size_t uiIndex, bool bCheck)
 357 {
 358     wxCHECK_RET( uiIndex < (size_t)GetCount(), _T("bad wxCheckListBox index") );
 359
 360     GetItem(uiIndex)->Check(bCheck);
 361 }
 362
 363 // process events
 364 // --------------
 365
 366 void wxCheckListBox::OnKeyDown(wxKeyEvent& event)
 367 {
 368     // what do we do?
 369     enum
 370     {
 371         None,
 372         Toggle,
 373         Set,
 374         Clear
 375     } oper;
 376
 377     switch ( event.KeyCode() )
 378     {
 379         case WXK_SPACE:
 380             oper = Toggle;
 381             break;
 382
 383         case WXK_NUMPAD_ADD:
 384         case '+':
 385             oper = Set;
 386             break;
 387
 388         case WXK_NUMPAD_SUBTRACT:
 389         case '-':
 390             oper = Clear;
 391             break;
 392
 393         default:
 394             oper = None;
 395     }
 396
 397     if ( oper != None )
 398     {
 399         wxArrayInt selections;
 400         int count;
 401         if ( HasMultipleSelection() )
 402         {
 403             count = GetSelections(selections);
 404         }
 405         else
 406         {
 407             count = 1;
 408             selections.Add(GetSelection());
 409         }
 410
 411         for ( int i = 0; i < count; i++ )
 412         {
 413             wxCheckListBoxItem *item = GetItem(selections[i]);
 414             if ( !item )
 415             {
 416                 wxFAIL_MSG( _T("no wxCheckListBoxItem?") );
 417                 continue;
 418             }
 419
 420             switch ( oper )
 421             {
 422                 case Toggle:
 423                     item->Toggle();
 424                     break;
 425
 426                 case Set:
 427                 case Clear:
 428                     item->Check( oper == Set );
 429                     break;
 430
 431                 default:
 432                     wxFAIL_MSG( _T("what should this key do?") );
 433             }
 434         }
 435     }
 436     else // nothing to do
 437     {
 438         event.Skip();
 439     }
 440 }
 441
 442 void wxCheckListBox::OnLeftClick(wxMouseEvent& event)
 443 {
 444   // clicking on the item selects it, clicking on the checkmark toggles
 445   if ( event.GetX() <= wxOwnerDrawn::GetDefaultMarginWidth() ) {
 446     #ifdef __WIN32__
 447       size_t nItem = (size_t)::SendMessage
 448                                (
 449                                 (HWND)GetHWND(),
 450                                 LB_ITEMFROMPOINT,
 451                                 0,
 452                                 MAKELPARAM(event.GetX(), event.GetY())
 453                                );
 454     #else // Win16
 455         // FIXME this doesn't work when the listbox is scrolled!
 456         size_t nItem = ((size_t)event.GetY()) / m_nItemHeight;
 457     #endif // Win32/16
 458
 459     if ( nItem < (size_t)m_noItems )
 460       GetItem(nItem)->Toggle();
 461     //else: it's not an error, just click outside of client zone
 462   }
 463   else {
 464     // implement default behaviour: clicking on the item selects it
 465     event.Skip();
 466   }
 467 }
 468
 469 #endif
 470