src/os2/scrolbar.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #ifndef WX_PRECOMP
  16 #include "wx/defs.h"
  17 #include "wx/utils.h"
  18 #endif
  19
  20 #include "wx/scrolbar.h"
  21 #include "wx/os2/private.h"
  22
  23 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar, wxControl)
  24
  25 // Scrollbar
  26 bool wxScrollBar::Create (
  27   wxWindow*                         pParent
  28 , wxWindowID                        vId
  29 , const wxPoint&                    rPos
  30 , const wxSize&                     rSize
  31 , long                              lStyle
  32 #if wxUSE_VALIDATORS
  33 , const wxValidator&                rValidator
  34 #endif
  35 , const wxString&                   rsName
  36 )
  37 {
  38     int                             nX = rPos.x;
  39     int                             nY = rPos.y;
  40     int                             nWidth = rSize.x;
  41     int                             nHeight = rSize.y;
  42
  43     if (!pParent)
  44         return FALSE;
  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 == -1L)
  54         m_windowId = (int)NewControlId();
  55     else
  56         m_windowId = vId;
  57
  58     if (nWidth == -1)
  59     {
  60         if (lStyle & wxHORIZONTAL)
  61             nWidth = 140;
  62         else
  63             nWidth = 14;
  64     }
  65     if (nHeight == -1)
  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
 101                     ,TRUE
 102                    );
 103     SetFont(*wxSMALL_FONT);
 104
 105     m_hWnd = hScrollBar;
 106
 107     //
 108     // Subclass again for purposes of dialog editing mode
 109     //
 110     SubclassWin((WXHWND)hScrollBar);
 111     SetSize( nX
 112             ,nY
 113             ,nWidth
 114             ,nHeight
 115            );
 116     return TRUE;
 117 } // end of wxScrollBar::Create
 118
 119 wxScrollBar::~wxScrollBar()
 120 {
 121 }
 122
 123 bool wxScrollBar::OS2OnScroll (
 124   int                               nOrientation
 125 , WXWORD                            wParam
 126 , WXWORD                            wPos
 127 , WXHWND                            hControl
 128 )
 129 {
 130     int                             nPosition;
 131     int                             nMaxPos;
 132     int                             nTrackPos = wPos;
 133     int                             nMinPos;
 134     int                             nScrollInc;
 135     wxEventType                     vScrollEvent = wxEVT_NULL;
 136
 137     MRESULT                         vRange;
 138
 139     //
 140     // When we're dragging the scrollbar we can't use pos parameter because it
 141     // is limited to 16 bits
 142     //
 143     if (wParam == SB_SLIDERPOSITION || wParam == SB_SLIDERTRACK)
 144     {
 145         SBCDATA                     vScrollInfo;
 146
 147         vScrollInfo.sHilite = SB_SLIDERTRACK;
 148
 149         ::WinSendMsg((HWND)GetHwnd(), WM_QUERYWINDOWPARAMS, (PVOID)&vScrollInfo, NULL);
 150
 151         nTrackPos = vScrollInfo.posThumb;
 152         nPosition = vScrollInfo.posFirst;
 153         nMaxPos   = vScrollInfo.posLast;
 154     }
 155     else
 156     {
 157         nPosition = (int)(MRESULT)::WinSendMsg((HWND)GetHwnd(), SBM_QUERYPOS, (MPARAM)NULL, (MPARAM)NULL);
 158         vRange = ::WinSendMsg((HWND)GetHwnd(), SBM_QUERYRANGE, (MPARAM)NULL, (MPARAM)NULL);
 159         nMinPos = SHORT1FROMMR(vRange);
 160         nMaxPos = SHORT2FROMMR(vRange);
 161     }
 162     //
 163     // A page size greater than one has the effect of reducing the effective
 164     // range, therefore the range has already been boosted artificially - so
 165     // reduce it again.
 166     //
 167     if (m_nPageSize > 1)
 168         nMaxPos -= (m_nPageSize - 1);
 169     switch (wParam)
 170     {
 171         case SB_LINEUP:
 172             nScrollInc   = -1;
 173             vScrollEvent = wxEVT_SCROLL_LINEUP;
 174             break;
 175
 176         case SB_LINEDOWN:
 177             nScrollInc   = 1;
 178             vScrollEvent = wxEVT_SCROLL_LINEDOWN;
 179             break;
 180
 181         case SB_PAGEUP:
 182             nScrollInc   = -GetPageSize();
 183             vScrollEvent = wxEVT_SCROLL_PAGEUP;
 184             break;
 185
 186         case SB_PAGEDOWN:
 187             nScrollInc   = GetPageSize();
 188             vScrollEvent = wxEVT_SCROLL_PAGEDOWN;
 189             break;
 190
 191         case SB_SLIDERTRACK:
 192             nScrollInc   = nTrackPos - nPosition;
 193             vScrollEvent = wxEVT_SCROLL_THUMBTRACK;
 194             break;
 195
 196         case SB_ENDSCROLL:
 197             nScrollInc   = 0;
 198             vScrollEvent = wxEVT_SCROLL_ENDSCROLL;
 199             break;
 200
 201         default:
 202             nScrollInc = 0;
 203     }
 204     if (nScrollInc)
 205     {
 206         nPosition += nScrollInc;
 207
 208         if (nPosition < 0)
 209             nPosition = 0;
 210         if (nPosition > nMaxPos)
 211             nPosition = nMaxPos;
 212         SetThumbPosition(nPosition);
 213     }
 214     else if ( vScrollEvent != wxEVT_SCROLL_THUMBRELEASE &&
 215               vScrollEvent != wxEVT_SCROLL_ENDSCROLL
 216             )
 217     {
 218         //
 219         // Don't process the event if there is no displacement,
 220         // unless this is a thumb release or end scroll event.
 221         //
 222         return FALSE;
 223     }
 224
 225     wxScrollEvent                   vEvent( vScrollEvent
 226                                            ,m_windowId
 227                                           );
 228
 229     vEvent.SetPosition(nPosition);
 230     vEvent.SetEventObject(this);
 231     return GetEventHandler()->ProcessEvent(vEvent);
 232 } // end of wxScrollBar::OS2OnScroll
 233
 234 void wxScrollBar::SetThumbPosition (
 235   int                               nViewStart
 236 )
 237 {
 238     SBCDATA                        vInfo;
 239
 240     memset(&vInfo, '\0', sizeof(SBCDATA));
 241     vInfo.cb       = sizeof(SBCDATA);
 242     vInfo.posThumb = nViewStart;
 243
 244     ::WinSendMsg((HWND)GetHwnd(), WM_SETWINDOWPARAMS, (MPARAM)&vInfo, (MPARAM)NULL);
 245     ::WinSendMsg((HWND)GetHwnd(), SBM_SETPOS, (MPARAM)nViewStart, (MPARAM)NULL);
 246 } // end of wxScrollBar::SetThumbPosition
 247
 248 int wxScrollBar::GetThumbPosition() const
 249 {
 250     return((int)(MRESULT)::WinSendMsg((HWND)GetHwnd(), SBM_QUERYPOS, (MPARAM)NULL, (MPARAM)NULL));
 251 } // end of wxScrollBar::GetThumbPosition
 252
 253 void wxScrollBar::SetScrollbar (
 254   int                               nPosition
 255 , int                               nThumbSize
 256 , int                               nRange
 257 , int                               nPageSize
 258 , bool                              bRefresh
 259 )
 260 {
 261     SBCDATA                         vInfo;
 262     //
 263     // The lRange (number of scroll steps) is the
 264     // object length minus the page size.
 265     //
 266     int                             nRange1 = wxMax((m_nObjectSize - m_nPageSize), 0);
 267
 268     m_nViewSize   = nPageSize;
 269     m_nPageSize   = nThumbSize;
 270     m_nObjectSize = nRange;
 271
 272
 273     //
 274     // Try to adjust the lRange to cope with page size > 1
 275     // (see comment for SetPageLength)
 276     //
 277     if (m_nPageSize > 1 )
 278     {
 279         nRange1 += (m_nPageSize - 1);
 280     }
 281     vInfo.cb = sizeof(SBCDATA);
 282     vInfo.cVisible = m_nPageSize;
 283     vInfo.posFirst = 0;
 284     vInfo.posLast  = nRange1;
 285     vInfo.posThumb = nPosition;
 286
 287     ::WinSendMsg((HWND)GetHwnd(), WM_SETWINDOWPARAMS, (MPARAM)&vInfo, (MPARAM)NULL);
 288 } // end of wxScrollBar::SetScrollbar
 289
 290 WXHBRUSH wxScrollBar::OnCtlColor (
 291   WXHDC                             hDC
 292 , WXHWND                            hWnd
 293 , WXUINT                            uCtlColor
 294 , WXUINT                            uMessage
 295 , WXWPARAM                          wParam
 296 , WXLPARAM                          lParam
 297 )
 298 {
 299     //
 300     // Does nothing under OS/2
 301     //
 302     return 0;
 303 } // end of wxScrollBar::OnCtlColor
 304
 305 void wxScrollBar::Command (
 306   wxCommandEvent&                   rEvent
 307 )
 308 {
 309     SetThumbPosition(rEvent.m_commandInt);
 310     ProcessCommand(rEvent);
 311 } // end of wxScrollBar::Command
 312