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 "wx/object.h"
  26 #include "wx/colour.h"
  27 #include "wx/font.h"
  28 #include "wx/bitmap.h"
  29 #include "wx/window.h"
  30 #include "wx/listbox.h"
  31 #include "wx/ownerdrw.h"
  32 #include "wx/settings.h"
  33 #include "wx/dcmemory.h"
  34 #include "wx/msw/checklst.h"
  35
  36 #include <windows.h>
  37
  38 // ============================================================================
  39 // implementation
  40 // ============================================================================
  41
  42 #if !USE_SHARED_LIBRARY
  43   IMPLEMENT_DYNAMIC_CLASS(wxCheckListBox, wxListBox)
  44 #endif
  45
  46 // ----------------------------------------------------------------------------
  47 // declaration and implementation of wxCheckListBoxItem class
  48 // ----------------------------------------------------------------------------
  49
  50 class wxCheckListBoxItem : public wxOwnerDrawn
  51 {
  52 public:
  53   // ctor
  54   wxCheckListBoxItem(wxCheckListBox *pParent, size_t nIndex);
  55
  56   // drawing functions
  57   virtual bool OnDrawItem(wxDC& dc, const wxRect& rc, wxODAction act, wxODStatus stat);
  58
  59   // simple accessors
  60   bool IsChecked() const  { return m_bChecked;        }
  61   void Check(bool bCheck) { m_bChecked = bCheck;      }
  62   void Toggle();
  63
  64 private:
  65   bool            m_bChecked;
  66   wxCheckListBox *m_pParent;
  67   size_t            m_nIndex;
  68 };
  69
  70 wxCheckListBoxItem::wxCheckListBoxItem(wxCheckListBox *pParent, size_t nIndex)
  71                   : wxOwnerDrawn("", TRUE)   // checkable
  72 {
  73   m_bChecked = FALSE;
  74   m_pParent  = pParent;
  75   m_nIndex   = nIndex;
  76
  77   // we don't initialize m_nCheckHeight/Width vars because it's
  78   // done in OnMeasure while they are used only in OnDraw and we
  79   // know that there will always be OnMeasure before OnDraw
  80
  81   // fix appearance
  82   SetFont(wxSystemSettings::GetSystemFont(wxSYS_ANSI_VAR_FONT));
  83   SetMarginWidth(GetDefaultMarginWidth());
  84 }
  85
  86 /*
  87  * JACS - I've got the owner-draw stuff partially working with WIN16,
  88  * with a really horrible-looking cross for wxCheckListBox instead of a
  89  * check - could use a bitmap check-mark instead, defined in wx.rc.
  90  * Also there's a refresh problem whereby it doesn't always draw the
  91  * check until you click to the right of it, which is OK for WIN32.
  92  */
  93
  94 bool wxCheckListBoxItem::OnDrawItem(wxDC& dc, const wxRect& rc,
  95                                     wxODAction act, wxODStatus stat)
  96 {
  97   if ( IsChecked() )
  98     stat = (wxOwnerDrawn::wxODStatus)(stat | wxOwnerDrawn::wxODChecked);
  99
 100   if ( wxOwnerDrawn::OnDrawItem(dc, rc, act, stat) ) {
 101     // ## using native API for performance and precision
 102     size_t nCheckWidth  = GetDefaultMarginWidth(),
 103          nCheckHeight = m_pParent->GetItemHeight();
 104
 105     int x = rc.GetX(),
 106         y = rc.GetY();
 107
 108     HDC hdc = (HDC)dc.GetHDC();
 109
 110     // create pens
 111     HPEN hpenBack = CreatePen(PS_SOLID, 0, GetSysColor(COLOR_WINDOW)),
 112          hpenGray = CreatePen(PS_SOLID, 0, RGB(128, 128, 128)),
 113          hpenPrev = (HPEN)SelectObject(hdc, hpenBack);
 114
 115     // we erase the 1-pixel border
 116     Rectangle(hdc, x, y, x + nCheckWidth, y + nCheckHeight);
 117
 118     // shift check mark 1 pixel to the right (it looks better like this)
 119     x++;
 120
 121     if ( IsChecked() ) {
 122       // first create a monochrome bitmap in a memory DC
 123       HDC hdcMem = CreateCompatibleDC(hdc);
 124       HBITMAP hbmpCheck = CreateBitmap(nCheckWidth, nCheckHeight, 1, 1, 0);
 125       HBITMAP hbmpOld = (HBITMAP)SelectObject(hdcMem, hbmpCheck);
 126
 127       // then draw a check mark into it
 128       RECT rect = { 0, 0, nCheckWidth, nCheckHeight };
 129
 130 #ifdef __WIN32__
 131 #ifndef __SC__
 132       DrawFrameControl(hdcMem, &rect, DFC_MENU, DFCS_MENUCHECK);
 133 #endif
 134 #else
 135       // In WIN16, draw a cross
 136       HPEN blackPen = CreatePen(PS_SOLID, 1, RGB(0, 0, 0));
 137       HPEN whiteBrush = GetStockObject(WHITE_BRUSH);
 138       HPEN hPenOld = ::SelectObject(hdcMem, blackPen);
 139       HPEN hBrushOld = ::SelectObject(hdcMem, whiteBrush);
 140       ::SetROP2(hdcMem, R2_COPYPEN);
 141       Rectangle(hdcMem, 0, 0, nCheckWidth, nCheckHeight);
 142       MoveTo(hdcMem, 0, 0);
 143       LineTo(hdcMem, nCheckWidth, nCheckHeight);
 144       MoveTo(hdcMem, nCheckWidth, 0);
 145       LineTo(hdcMem, 0, nCheckHeight);
 146       ::SelectObject(hdcMem, hPenOld);
 147       ::SelectObject(hdcMem, hBrushOld);
 148       ::DeleteObject(blackPen);
 149 #endif
 150
 151       // finally copy it to screen DC and clean up
 152       BitBlt(hdc, x, y, nCheckWidth - 1, nCheckHeight,
 153              hdcMem, 0, 0, SRCCOPY);
 154
 155       SelectObject(hdcMem, hbmpOld);
 156       DeleteObject(hbmpCheck);
 157       DeleteDC(hdcMem);
 158     }
 159
 160     // now we draw the smaller rectangle
 161     y++;
 162     nCheckWidth  -= 2;
 163     nCheckHeight -= 2;
 164
 165     // draw hollow gray rectangle
 166     (void)SelectObject(hdc, hpenGray);
 167     HBRUSH hbrPrev  = (HBRUSH)SelectObject(hdc, GetStockObject(NULL_BRUSH));
 168     Rectangle(hdc, x, y, x + nCheckWidth, y + nCheckHeight);
 169
 170     // clean up
 171     (void)SelectObject(hdc, hpenPrev);
 172     (void)SelectObject(hdc, hbrPrev);
 173
 174     DeleteObject(hpenBack);
 175     DeleteObject(hpenGray);
 176
 177     /*
 178     dc.DrawRectangle(x, y, nCheckWidth, nCheckHeight);
 179
 180     if ( IsChecked() ) {
 181       dc.DrawLine(x, y, x + nCheckWidth, y + nCheckHeight);
 182       dc.DrawLine(x, y + nCheckHeight, x + nCheckWidth, y);
 183     }
 184     */
 185
 186     return TRUE;
 187   }
 188
 189   return FALSE;
 190 }
 191
 192 // change the state of the item and redraw it
 193 void wxCheckListBoxItem::Toggle()
 194 {
 195   m_bChecked = !m_bChecked;
 196
 197   size_t nHeight = m_pParent->GetItemHeight();
 198   size_t y = m_nIndex * nHeight;
 199   RECT rcUpdate = { 0, y, GetDefaultMarginWidth(), y + nHeight};
 200   InvalidateRect((HWND)m_pParent->GetHWND(), &rcUpdate, FALSE);
 201
 202   wxCommandEvent event(wxEVT_COMMAND_CHECKLISTBOX_TOGGLED, m_pParent->GetId());
 203   event.SetInt(m_nIndex);
 204   event.SetEventObject(m_pParent);
 205   m_pParent->ProcessCommand(event);
 206 }
 207
 208 // ----------------------------------------------------------------------------
 209 // implementation of wxCheckListBox class
 210 // ----------------------------------------------------------------------------
 211
 212 // define event table
 213 // ------------------
 214 BEGIN_EVENT_TABLE(wxCheckListBox, wxListBox)
 215   EVT_CHAR(wxCheckListBox::OnChar)
 216   EVT_LEFT_DOWN(wxCheckListBox::OnLeftClick)
 217 END_EVENT_TABLE()
 218
 219 // control creation
 220 // ----------------
 221
 222 // def ctor: use Create() to really create the control
 223 wxCheckListBox::wxCheckListBox() : wxListBox()
 224 {
 225 }
 226
 227 // ctor which creates the associated control
 228 wxCheckListBox::wxCheckListBox(wxWindow *parent, wxWindowID id,
 229                                const wxPoint& pos, const wxSize& size,
 230                                int nStrings, const wxString choices[],
 231                                long style, const wxValidator& val,
 232                                const wxString& name) // , const wxFont& font)
 233                 // don't use ctor with arguments! we must call Create()
 234                 // ourselves from here.
 235               : wxListBox()
 236 //                , m_font(font)
 237 {
 238   Create(parent, id, pos, size, nStrings, choices, style|wxLB_OWNERDRAW, val, name);
 239 }
 240
 241 // create/retrieve item
 242 // --------------------
 243
 244 // create a check list box item
 245 wxOwnerDrawn *wxCheckListBox::CreateItem(size_t nIndex)
 246 {
 247   wxCheckListBoxItem *pItem = new wxCheckListBoxItem(this, nIndex);
 248   if ( m_windowFont.Ok() )
 249     pItem->SetFont(m_windowFont);
 250
 251   return pItem;
 252 }
 253
 254 // get item (converted to right type)
 255 #define GetItem(n)    ((wxCheckListBoxItem *)(GetItem(n)))
 256
 257 // return item size
 258 // ----------------
 259 bool wxCheckListBox::MSWOnMeasure(WXMEASUREITEMSTRUCT *item)
 260 {
 261   if ( wxListBox::MSWOnMeasure(item) ) {
 262     MEASUREITEMSTRUCT *pStruct = (MEASUREITEMSTRUCT *)item;
 263
 264     // save item height
 265     m_nItemHeight = pStruct->itemHeight;
 266
 267     // add place for the check mark
 268     pStruct->itemWidth += wxOwnerDrawn::GetDefaultMarginWidth();
 269
 270     return TRUE;
 271   }
 272
 273   return FALSE;
 274 }
 275
 276 // check items
 277 // -----------
 278
 279 bool wxCheckListBox::IsChecked(size_t uiIndex) const
 280 {
 281   return GetItem(uiIndex)->IsChecked();
 282 }
 283
 284 void wxCheckListBox::Check(size_t uiIndex, bool bCheck)
 285 {
 286   GetItem(uiIndex)->Check(bCheck);
 287 }
 288
 289 // process events
 290 // --------------
 291
 292 void wxCheckListBox::OnChar(wxKeyEvent& event)
 293 {
 294   if ( event.KeyCode() == WXK_SPACE )
 295     GetItem(GetSelection())->Toggle();
 296   else
 297     wxListBox::OnChar(event);
 298 }
 299
 300 void wxCheckListBox::OnLeftClick(wxMouseEvent& event)
 301 {
 302   // clicking on the item selects it, clicking on the checkmark toggles
 303   if ( event.GetX() <= wxOwnerDrawn::GetDefaultMarginWidth() ) {
 304     // # better use LB_ITEMFROMPOINT perhaps?
 305     size_t nItem = ((size_t)event.GetY()) / m_nItemHeight;
 306     if ( nItem < (size_t)m_noItems )
 307       GetItem(nItem)->Toggle();
 308     //else: it's not an error, just click outside of client zone
 309   }
 310   else {
 311     // implement default behaviour: clicking on the item selects it
 312     event.Skip();
 313   }
 314 }
 315
 316 #endif
 317