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 #ifdef __GNUG__
  13 #pragma implementation "checklst.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_OWNER_DRAWN
  24
  25 #include <windows.h>
  26
  27 #include "wx/ownerdrw.h"
  28 #include "wx/msw/checklst.h"
  29
  30 // ============================================================================
  31 // implementation
  32 // ============================================================================
  33
  34 #if !USE_SHARED_LIBRARY
  35   IMPLEMENT_DYNAMIC_CLASS(wxCheckListBox, wxListBox)
  36 #endif
  37
  38 // ----------------------------------------------------------------------------
  39 // declaration and implementation of wxCheckListBoxItem class
  40 // ----------------------------------------------------------------------------
  41
  42 class wxCheckListBoxItem : public wxOwnerDrawn
  43 {
  44 public:
  45   // ctor
  46   wxCheckListBoxItem(wxCheckListBox *pParent, size_t nIndex);
  47
  48   // drawing functions
  49   virtual bool OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus stat);
  50
  51   // simple accessors
  52   bool IsChecked() const  { return m_bChecked;        }
  53   void Check(bool bCheck) { m_bChecked = bCheck;      }
  54   void Toggle();
  55
  56 private:
  57   bool            m_bChecked;
  58   wxCheckListBox *m_pParent;
  59   size_t            m_nIndex;
  60 };
  61
  62 wxCheckListBoxItem::wxCheckListBoxItem(wxCheckListBox *pParent, size_t nIndex)
  63                   : wxOwnerDrawn("", TRUE)   // checkable
  64 {
  65   m_bChecked = FALSE;
  66   m_pParent  = pParent;
  67   m_nIndex   = nIndex;
  68
  69   // we don't initialize m_nCheckHeight/Width vars because it's
  70   // done in OnMeasure while they are used only in OnDraw and we
  71   // know that there will always be OnMeasure before OnDraw
  72
  73   // fix appearance
  74   SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
  75   SetMarginWidth(GetDefaultMarginWidth());
  76 }
  77
  78 /*
  79  * JACS - I've got the owner-draw stuff partially working with WIN16,
  80  * with a really horrible-looking cross for wxCheckListBox instead of a
  81  * check - could use a bitmap check-mark instead, defined in wx.rc.
  82  * Also there's a refresh problem whereby it doesn't always draw the
  83  * check until you click to the right of it, which is OK for WIN32.
  84  */
  85
  86 bool wxCheckListBoxItem::OnDrawItem(wxDC& dc, const wxRect& rc,
  87                                     wxODAction act, wxODStatus stat)
  88 {
  89   if ( IsChecked() )
  90     stat = (wxOwnerDrawn::wxODStatus)(stat | wxOwnerDrawn::wxODChecked);
  91
  92   if ( wxOwnerDrawn::OnDrawItem(dc, rc, act, stat) ) {
  93     // ## using native API for performance and precision
  94     size_t nCheckWidth  = GetDefaultMarginWidth(),
  95          nCheckHeight = m_pParent->GetItemHeight();
  96
  97     int x = rc.GetX(),
  98         y = rc.GetY();
  99
 100     HDC hdc = (HDC)dc.GetHDC();
 101
 102     // create pens
 103     HPEN hpenBack = CreatePen(PS_SOLID, 0, GetSysColor(COLOR_WINDOW)),
 104          hpenGray = CreatePen(PS_SOLID, 0, RGB(128, 128, 128)),
 105          hpenPrev = (HPEN)SelectObject(hdc, hpenBack);
 106
 107     // we erase the 1-pixel border
 108     Rectangle(hdc, x, y, x + nCheckWidth, y + nCheckHeight);
 109
 110     // shift check mark 1 pixel to the right (it looks better like this)
 111     x++;
 112
 113     if ( IsChecked() ) {
 114       // first create a monochrome bitmap in a memory DC
 115       HDC hdcMem = CreateCompatibleDC(hdc);
 116       HBITMAP hbmpCheck = CreateBitmap(nCheckWidth, nCheckHeight, 1, 1, 0);
 117       HBITMAP hbmpOld = (HBITMAP)SelectObject(hdcMem, hbmpCheck);
 118
 119       // then draw a check mark into it
 120       RECT rect = { 0, 0, nCheckWidth, nCheckHeight };
 121
 122 #ifdef __WIN32__
 123       DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 124 #else
 125       // In WIN16, draw a cross
 126       HPEN blackPen = CreatePen(PS_SOLID, 1, RGB(0, 0, 0));
 127       HPEN whiteBrush = GetStockObject(WHITE_BRUSH);
 128       HPEN hPenOld = ::SelectObject(hdcMem, blackPen);
 129       HPEN hBrushOld = ::SelectObject(hdcMem, whiteBrush);
 130       ::SetROP2(hdcMem, R2_COPYPEN);
 131       Rectangle(hdcMem, 0, 0, nCheckWidth, nCheckHeight);
 132       MoveTo(hdcMem, 0, 0);
 133       LineTo(hdcMem, nCheckWidth, nCheckHeight);
 134       MoveTo(hdcMem, nCheckWidth, 0);
 135       LineTo(hdcMem, 0, nCheckHeight);
 136       ::SelectObject(hdcMem, hPenOld);
 137       ::SelectObject(hdcMem, hBrushOld);
 138       ::DeleteObject(blackPen);
 139 #endif
 140
 141       // finally copy it to screen DC and clean up
 142       BitBlt(hdc, x, y, nCheckWidth - 1, nCheckHeight,
 143              hdcMem, 0, 0, SRCCOPY);
 144
 145       SelectObject(hdcMem, hbmpOld);
 146       DeleteObject(hbmpCheck);
 147       DeleteDC(hdcMem);
 148     }
 149
 150     // now we draw the smaller rectangle
 151     y++;
 152     nCheckWidth  -= 2;
 153     nCheckHeight -= 2;
 154
 155     // draw hollow gray rectangle
 156     (void)SelectObject(hdc, hpenGray);
 157     HBRUSH hbrPrev  = (HBRUSH)SelectObject(hdc, GetStockObject(NULL_BRUSH));
 158     Rectangle(hdc, x, y, x + nCheckWidth, y + nCheckHeight);
 159
 160     // clean up
 161     (void)SelectObject(hdc, hpenPrev);
 162     (void)SelectObject(hdc, hbrPrev);
 163
 164     DeleteObject(hpenBack);
 165     DeleteObject(hpenGray);
 166
 167     /*
 168     dc.DrawRectangle(x, y, nCheckWidth, nCheckHeight);
 169
 170     if ( IsChecked() ) {
 171       dc.DrawLine(x, y, x + nCheckWidth, y + nCheckHeight);
 172       dc.DrawLine(x, y + nCheckHeight, x + nCheckWidth, y);
 173     }
 174     */
 175
 176     return TRUE;
 177   }
 178
 179   return FALSE;
 180 }
 181
 182 // change the state of the item and redraw it
 183 void wxCheckListBoxItem::Toggle()
 184 {
 185   m_bChecked = !m_bChecked;
 186
 187   size_t nHeight = m_pParent->GetItemHeight();
 188   size_t y = m_nIndex * nHeight;
 189   RECT rcUpdate = { 0, y, GetDefaultMarginWidth(), y + nHeight};
 190   InvalidateRect((HWND)m_pParent->GetHWND(), &rcUpdate, FALSE);
 191
 192   wxCommandEvent event(wxEVT_COMMAND_CHECKLISTBOX_TOGGLED, m_pParent->GetId());
 193   event.SetInt(m_nIndex);
 194   event.SetEventObject(m_pParent);
 195   m_pParent->ProcessCommand(event);
 196 }
 197
 198 // ----------------------------------------------------------------------------
 199 // implementation of wxCheckListBox class
 200 // ----------------------------------------------------------------------------
 201
 202 // define event table
 203 // ------------------
 204 BEGIN_EVENT_TABLE(wxCheckListBox, wxListBox)
 205   EVT_CHAR(wxCheckListBox::OnChar)
 206   EVT_LEFT_DOWN(wxCheckListBox::OnLeftClick)
 207 END_EVENT_TABLE()
 208
 209 // control creation
 210 // ----------------
 211
 212 // def ctor: use Create() to really create the control
 213 wxCheckListBox::wxCheckListBox() : wxListBox()
 214 {
 215 }
 216
 217 // ctor which creates the associated control
 218 wxCheckListBox::wxCheckListBox(wxWindow *parent, wxWindowID id,
 219                                const wxPoint& pos, const wxSize& size,
 220                                int nStrings, const wxString choices[],
 221                                long style, const wxValidator& val,
 222                                const wxString& name) // , const wxFont& font)
 223                 // don't use ctor with arguments! we must call Create()
 224                 // ourselves from here.
 225               : wxListBox()
 226 //                , m_font(font)
 227 {
 228   Create(parent, id, pos, size, nStrings, choices, style|wxLB_OWNERDRAW, val, name);
 229 }
 230
 231 // create/retrieve item
 232 // --------------------
 233
 234 // create a check list box item
 235 wxOwnerDrawn *wxCheckListBox::CreateItem(size_t nIndex)
 236 {
 237   wxCheckListBoxItem *pItem = new wxCheckListBoxItem(this, nIndex);
 238   if ( m_windowFont.Ok() )
 239     pItem->SetFont(m_windowFont);
 240
 241   return pItem;
 242 }
 243
 244 // get item (converted to right type)
 245 #define GetItem(n)    ((wxCheckListBoxItem *)(GetItem(n)))
 246
 247 // return item size
 248 // ----------------
 249 bool wxCheckListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 250 {
 251   if ( wxListBox::MSWOnMeasure(item) ) {
 252     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 253
 254     // save item height
 255     m_nItemHeight = pStruct->itemHeight;
 256
 257     // add place for the check mark
 258     pStruct->itemWidth += wxOwnerDrawn::GetDefaultMarginWidth();
 259
 260     return TRUE;
 261   }
 262
 263   return FALSE;
 264 }
 265
 266 // check items
 267 // -----------
 268
 269 bool wxCheckListBox::IsChecked(size_t uiIndex) const
 270 {
 271   return GetItem(uiIndex)->IsChecked();
 272 }
 273
 274 void wxCheckListBox::Check(size_t uiIndex, bool bCheck)
 275 {
 276   GetItem(uiIndex)->Check(bCheck);
 277 }
 278
 279 // process events
 280 // --------------
 281
 282 void wxCheckListBox::OnChar(wxKeyEvent& event)
 283 {
 284   if ( event.KeyCode() == WXK_SPACE )
 285     GetItem(GetSelection())->Toggle();
 286   else
 287     wxListBox::OnChar(event);
 288 }
 289
 290 void wxCheckListBox::OnLeftClick(wxMouseEvent& event)
 291 {
 292   // clicking on the item selects it, clicking on the checkmark toggles
 293   if ( event.GetX() <= wxOwnerDrawn::GetDefaultMarginWidth() ) {
 294     // # better use LB_ITEMFROMPOINT perhaps?
 295     size_t nItem = ((size_t)event.GetY()) / m_nItemHeight;
 296     if ( nItem < (size_t)m_noItems )
 297       GetItem(nItem)->Toggle();
 298     //else: it's not an error, just click outside of client zone
 299   }
 300   else {
 301     // implement default behaviour: clicking on the item selects it
 302     event.Skip();
 303   }
 304 }
 305
 306 #endif
 307