src/os2/scrolbar.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/os2/scrolbar.cpp
   3 // Purpose:     wxScrollBar
   4 // Author:      David Webster
   5 // Modified by:
   6 // Created:     10/15/99
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) David Webster
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #include "wx/scrolbar.h"
  16
  17 #ifndef WX_PRECOMP
  18     #include "wx/utils.h"
  19 #endif
  20
  21 #include "wx/os2/private.h"
  22
  23 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar, wxControl)
  24
  25 // Scrollbar
  26 bool wxScrollBar::Create(wxWindow* pParent,
  27                          wxWindowID vId,
  28                          const wxPoint& rPos,
  29                          const wxSize& rSize,
  30                          long lStyle,
  31 #if wxUSE_VALIDATORS
  32                          const wxValidator& rValidator,
  33 #endif
  34                          const wxString& rsName
  35                         )
  36 {
  37     int nX = rPos.x;
  38     int nY = rPos.y;
  39     int nWidth = rSize.x;
  40     int nHeight = rSize.y;
  41
  42     if (!pParent)
  43         return false;
  44
  45     pParent->AddChild(this);
  46     SetName(rsName);
  47 #if wxUSE_VALIDATORS
  48     SetValidator(rValidator);
  49 #endif
  50     SetBackgroundColour(pParent->GetBackgroundColour()) ;
  51     SetForegroundColour(pParent->GetForegroundColour()) ;
  52
  53     if (vId == wxID_ANY)
  54         m_windowId = (int)NewControlId();
  55     else
  56         m_windowId = vId;
  57
  58     if (nWidth == wxDefaultCoord)
  59     {
  60         if (lStyle & wxHORIZONTAL)
  61             nWidth = 140;
  62         else
  63             nWidth = 14;
  64     }
  65     if (nHeight == wxDefaultCoord)
  66     {
  67         if (lStyle & wxVERTICAL)
  68             nHeight = 140;
  69         else
  70             nHeight = 14;
  71     }
  72
  73     DWORD                           dwStyle = WS_VISIBLE;
  74
  75     if (GetWindowStyleFlag() & wxCLIP_SIBLINGS)
  76         dwStyle |= WS_CLIPSIBLINGS;
  77
  78     DWORD dwDirection = (lStyle & wxHORIZONTAL) ? SBS_HORZ: SBS_VERT;
  79
  80     HWND hScrollBar = ::WinCreateWindow( (HWND)GetHwndOf(pParent)
  81                                          ,WC_SCROLLBAR
  82                                          ,(PSZ)NULL
  83                                          ,dwDirection | dwStyle
  84                                          ,0, 0, 0, 0
  85                                          ,(HWND)GetHwndOf(pParent)
  86                                          ,HWND_TOP
  87                                          ,(HMENU)m_windowId
  88                                          ,NULL
  89                                          ,NULL
  90                                          );
  91
  92     m_nPageSize = 1;
  93     m_nViewSize = 1;
  94     m_nObjectSize = 1;
  95     ::WinSendMsg( hScrollBar
  96                  ,SBM_SETSCROLLBAR
  97                  ,(MPARAM)0
  98                  ,MPFROM2SHORT(0,1)
  99                 );
 100     ::WinShowWindow( hScrollBar, TRUE );
 101     SetFont(*wxSMALL_FONT);
 102
 103     m_hWnd = hScrollBar;
 104
 105     //
 106     // Subclass again for purposes of dialog editing mode
 107     //
 108     SubclassWin((WXHWND)hScrollBar);
 109     SetSize( nX
 110             ,nY
 111             ,nWidth
 112             ,nHeight
 113            );
 114     return true;
 115 } // end of wxScrollBar::Create
 116
 117 wxScrollBar::~wxScrollBar()
 118 {
 119 }
 120
 121 bool wxScrollBar::OS2OnScroll ( int    WXUNUSED(nOrientation),
 122                                 WXWORD wParam,
 123                                 WXWORD wPos,
 124                                 WXHWND WXUNUSED(hControl) )
 125 {
 126     int         nPosition;
 127     int         nMaxPos;
 128     int         nTrackPos = wPos;
 129     int         nMinPos;
 130     int         nScrollInc;
 131     wxEventType vScrollEvent = wxEVT_NULL;
 132
 133     MRESULT     vRange;
 134
 135     //
 136     // When we're dragging the scrollbar we can't use pos parameter because it
 137     // is limited to 16 bits
 138     //
 139     if (wParam == SB_SLIDERPOSITION || wParam == SB_SLIDERTRACK)
 140     {
 141         SBCDATA                     vScrollInfo;
 142
 143         vScrollInfo.sHilite = SB_SLIDERTRACK;
 144
 145         ::WinSendMsg((HWND)GetHwnd(), WM_QUERYWINDOWPARAMS, (PVOID)&vScrollInfo, NULL);
 146
 147         nTrackPos = vScrollInfo.posThumb;
 148         nPosition = vScrollInfo.posFirst;
 149         nMaxPos   = vScrollInfo.posLast;
 150     }
 151     else
 152     {
 153         nPosition = (int)(MRESULT)::WinSendMsg((HWND)GetHwnd(), SBM_QUERYPOS, (MPARAM)NULL, (MPARAM)NULL);
 154         vRange = ::WinSendMsg((HWND)GetHwnd(), SBM_QUERYRANGE, (MPARAM)NULL, (MPARAM)NULL);
 155         nMinPos = SHORT1FROMMR(vRange);
 156         nMaxPos = SHORT2FROMMR(vRange);
 157     }
 158     //
 159     // A page size greater than one has the effect of reducing the effective
 160     // range, therefore the range has already been boosted artificially - so
 161     // reduce it again.
 162     //
 163     if (m_nPageSize > 1)
 164         nMaxPos -= (m_nPageSize - 1);
 165     switch (wParam)
 166     {
 167         case SB_LINEUP:
 168             nScrollInc   = -1;
 169             vScrollEvent = wxEVT_SCROLL_LINEUP;
 170             break;
 171
 172         case SB_LINEDOWN:
 173             nScrollInc   = 1;
 174             vScrollEvent = wxEVT_SCROLL_LINEDOWN;
 175             break;
 176
 177         case SB_PAGEUP:
 178             nScrollInc   = -GetPageSize();
 179             vScrollEvent = wxEVT_SCROLL_PAGEUP;
 180             break;
 181
 182         case SB_PAGEDOWN:
 183             nScrollInc   = GetPageSize();
 184             vScrollEvent = wxEVT_SCROLL_PAGEDOWN;
 185             break;
 186
 187         case SB_SLIDERTRACK:
 188             nScrollInc   = nTrackPos - nPosition;
 189             vScrollEvent = wxEVT_SCROLL_THUMBTRACK;
 190             break;
 191
 192         case SB_ENDSCROLL:
 193             nScrollInc   = 0;
 194             vScrollEvent = wxEVT_SCROLL_CHANGED;
 195             break;
 196
 197         default:
 198             nScrollInc = 0;
 199     }
 200     if (nScrollInc)
 201     {
 202         nPosition += nScrollInc;
 203
 204         if (nPosition < 0)
 205             nPosition = 0;
 206         if (nPosition > nMaxPos)
 207             nPosition = nMaxPos;
 208         SetThumbPosition(nPosition);
 209     }
 210     else if ( vScrollEvent != wxEVT_SCROLL_THUMBRELEASE &&
 211               vScrollEvent != wxEVT_SCROLL_CHANGED
 212             )
 213     {
 214         //
 215         // Don't process the event if there is no displacement,
 216         // unless this is a thumb release or end scroll event.
 217         //
 218         return false;
 219     }
 220
 221     wxScrollEvent                   vEvent( vScrollEvent
 222                                            ,m_windowId
 223                                           );
 224
 225     vEvent.SetOrientation(IsVertical() ? wxVERTICAL : wxHORIZONTAL);
 226     vEvent.SetPosition(nPosition);
 227     vEvent.SetEventObject(this);
 228     return HandleWindowEvent(vEvent);
 229 } // end of wxScrollBar::OS2OnScroll
 230
 231 void wxScrollBar::SetThumbPosition ( int nViewStart )
 232 {
 233     SBCDATA                        vInfo;
 234
 235     memset(&vInfo, '\0', sizeof(SBCDATA));
 236     vInfo.cb       = sizeof(SBCDATA);
 237     vInfo.posThumb = (SHORT)nViewStart;
 238
 239     ::WinSendMsg((HWND)GetHwnd(), WM_SETWINDOWPARAMS, (MPARAM)&vInfo, (MPARAM)NULL);
 240     ::WinSendMsg((HWND)GetHwnd(), SBM_SETPOS, (MPARAM)nViewStart, (MPARAM)NULL);
 241 } // end of wxScrollBar::SetThumbPosition
 242
 243 int wxScrollBar::GetThumbPosition() const
 244 {
 245     return((int)(MRESULT)::WinSendMsg((HWND)GetHwnd(), SBM_QUERYPOS, (MPARAM)NULL, (MPARAM)NULL));
 246 } // end of wxScrollBar::GetThumbPosition
 247
 248 void wxScrollBar::SetScrollbar ( int  nPosition,
 249                                  int  nThumbSize,
 250                                  int  nRange,
 251                                  int  nPageSize,
 252                                  bool WXUNUSED(bRefresh) )
 253 {
 254     SBCDATA                         vInfo;
 255     //
 256     // The lRange (number of scroll steps) is the
 257     // object length minus the page size.
 258     //
 259     int                             nRange1 = wxMax((m_nObjectSize - m_nPageSize), 0);
 260
 261     m_nViewSize   = nPageSize;
 262     m_nPageSize   = nThumbSize;
 263     m_nObjectSize = nRange;
 264
 265
 266     //
 267     // Try to adjust the lRange to cope with page size > 1
 268     // (see comment for SetPageLength)
 269     //
 270     if (m_nPageSize > 1 )
 271     {
 272         nRange1 += (m_nPageSize - 1);
 273     }
 274     vInfo.cb = sizeof(SBCDATA);
 275     vInfo.cVisible = (SHORT)m_nPageSize;
 276     vInfo.posFirst = 0;
 277     vInfo.posLast  = (SHORT)nRange1;
 278     vInfo.posThumb = (SHORT)nPosition;
 279
 280     ::WinSendMsg((HWND)GetHwnd(), WM_SETWINDOWPARAMS, (MPARAM)&vInfo, (MPARAM)NULL);
 281 } // end of wxScrollBar::SetScrollbar
 282
 283 WXHBRUSH wxScrollBar::OnCtlColor ( WXHDC    WXUNUSED(hDC),
 284                                    WXHWND   WXUNUSED(hWnd),
 285                                    WXUINT   WXUNUSED(uCtlColor),
 286                                    WXUINT   WXUNUSED(uMessage),
 287                                    WXWPARAM WXUNUSED(wParam),
 288                                    WXLPARAM WXUNUSED(lParam) )
 289 {
 290     //
 291     // Does nothing under OS/2
 292     //
 293     return 0;
 294 } // end of wxScrollBar::OnCtlColor
 295
 296 void wxScrollBar::Command ( wxCommandEvent& rEvent )
 297 {
 298     SetThumbPosition(rEvent.GetInt());
 299     ProcessCommand(rEvent);
 300 } // end of wxScrollBar::Command