src/msw/scrolbar.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        msw/scrolbar.cpp
   3 // Purpose:     wxScrollBar
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  13     #pragma implementation "scrolbar.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_SCROLLBAR
  24
  25 #ifndef WX_PRECOMP
  26     #include "wx/utils.h"
  27 #endif
  28
  29 #include "wx/scrolbar.h"
  30 #include "wx/msw/private.h"
  31 #include "wx/settings.h"
  32
  33 #if wxUSE_EXTENDED_RTTI
  34 WX_DEFINE_FLAGS( wxScrollBarStyle )
  35
  36 wxBEGIN_FLAGS( wxScrollBarStyle )
  37     // new style border flags, we put them first to
  38     // use them for streaming out
  39     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  40     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  41     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  42     wxFLAGS_MEMBER(wxBORDER_RAISED)
  43     wxFLAGS_MEMBER(wxBORDER_STATIC)
  44     wxFLAGS_MEMBER(wxBORDER_NONE)
  45
  46     // old style border flags
  47     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  48     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  49     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  50     wxFLAGS_MEMBER(wxRAISED_BORDER)
  51     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  52     wxFLAGS_MEMBER(wxBORDER)
  53
  54     // standard window styles
  55     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  56     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  57     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  58     wxFLAGS_MEMBER(wxWANTS_CHARS)
  59     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  60     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  61     wxFLAGS_MEMBER(wxVSCROLL)
  62     wxFLAGS_MEMBER(wxHSCROLL)
  63
  64     wxFLAGS_MEMBER(wxSB_HORIZONTAL)
  65     wxFLAGS_MEMBER(wxSB_VERTICAL)
  66
  67 wxEND_FLAGS( wxScrollBarStyle )
  68
  69 IMPLEMENT_DYNAMIC_CLASS_XTI(wxScrollBar, wxControl,"wx/scrolbar.h")
  70
  71 wxBEGIN_PROPERTIES_TABLE(wxScrollBar)
  72     wxEVENT_RANGE_PROPERTY( Scroll , wxEVT_SCROLL_TOP , wxEVT_SCROLL_ENDSCROLL , wxScrollEvent )
  73
  74     wxPROPERTY( ThumbPosition , int , SetThumbPosition, GetThumbPosition, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  75     wxPROPERTY( Range , int , SetRange, GetRange, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  76     wxPROPERTY( ThumbSize , int , SetThumbSize, GetThumbSize, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  77     wxPROPERTY( PageSize , int , SetPageSize, GetPageSize, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  78     wxPROPERTY_FLAGS( WindowStyle , wxScrollBarStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  79 wxEND_PROPERTIES_TABLE()
  80
  81 wxBEGIN_HANDLERS_TABLE(wxScrollBar)
  82 wxEND_HANDLERS_TABLE()
  83
  84 wxCONSTRUCTOR_5( wxScrollBar , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size , long , WindowStyle )
  85 #else
  86 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar, wxControl)
  87 #endif
  88
  89 // Scrollbar
  90 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
  91            const wxPoint& pos,
  92            const wxSize& size, long style,
  93            const wxValidator& validator,
  94            const wxString& name)
  95 {
  96     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
  97         return false;
  98
  99     if (!MSWCreateControl(wxT("ScrollBar"), wxEmptyString, pos, size))
 100         return false;
 101
 102     SetScrollbar(0, 1, 2, 1, false);
 103
 104     return true;
 105 }
 106
 107 wxScrollBar::~wxScrollBar(void)
 108 {
 109 }
 110
 111 bool wxScrollBar::MSWOnScroll(int WXUNUSED(orientation), WXWORD wParam,
 112                               WXWORD pos, WXHWND WXUNUSED(control))
 113 {
 114     // current and max positions
 115     int position,
 116         maxPos, trackPos = pos;
 117
 118     wxUnusedVar(trackPos);
 119
 120     // when we're dragging the scrollbar we can't use pos parameter because it
 121     // is limited to 16 bits
 122     // JACS: now always using GetScrollInfo, since there's no reason
 123     // not to
 124 //    if ( wParam == SB_THUMBPOSITION || wParam == SB_THUMBTRACK )
 125     {
 126         SCROLLINFO scrollInfo;
 127         wxZeroMemory(scrollInfo);
 128         scrollInfo.cbSize = sizeof(SCROLLINFO);
 129
 130         // also get the range if we call GetScrollInfo() anyhow -- this is less
 131         // expensive than call it once here and then call GetScrollRange()
 132         // below
 133         scrollInfo.fMask = SIF_RANGE | SIF_POS | SIF_TRACKPOS;
 134
 135         if ( !::GetScrollInfo(GetHwnd(), SB_CTL, &scrollInfo) )
 136         {
 137             wxLogLastError(_T("GetScrollInfo"));
 138         }
 139
 140         trackPos = scrollInfo.nTrackPos;
 141         position = scrollInfo.nPos;
 142         maxPos = scrollInfo.nMax;
 143     }
 144 #if 0
 145     else
 146     {
 147         position = ::GetScrollPos((HWND) control, SB_CTL);
 148         int minPos;
 149         ::GetScrollRange((HWND) control, SB_CTL, &minPos, &maxPos);
 150     }
 151 #endif
 152
 153 #if defined(__WIN95__)
 154     // A page size greater than one has the effect of reducing the effective
 155     // range, therefore the range has already been boosted artificially - so
 156     // reduce it again.
 157     if ( m_pageSize > 1 )
 158         maxPos -= (m_pageSize - 1);
 159 #endif // __WIN95__
 160
 161     wxEventType scrollEvent = wxEVT_NULL;
 162
 163     int nScrollInc;
 164     switch ( wParam )
 165     {
 166         case SB_BOTTOM:
 167             nScrollInc = maxPos - position;
 168             scrollEvent = wxEVT_SCROLL_TOP;
 169             break;
 170
 171         case SB_TOP:
 172             nScrollInc = -position;
 173             scrollEvent = wxEVT_SCROLL_BOTTOM;
 174             break;
 175
 176         case SB_LINEUP:
 177             nScrollInc = -1;
 178             scrollEvent = wxEVT_SCROLL_LINEUP;
 179             break;
 180
 181         case SB_LINEDOWN:
 182             nScrollInc = 1;
 183             scrollEvent = wxEVT_SCROLL_LINEDOWN;
 184             break;
 185
 186         case SB_PAGEUP:
 187             nScrollInc = -GetPageSize();
 188             scrollEvent = wxEVT_SCROLL_PAGEUP;
 189             break;
 190
 191         case SB_PAGEDOWN:
 192             nScrollInc = GetPageSize();
 193             scrollEvent = wxEVT_SCROLL_PAGEDOWN;
 194             break;
 195
 196         case SB_THUMBPOSITION:
 197             nScrollInc = trackPos - position;
 198             scrollEvent = wxEVT_SCROLL_THUMBRELEASE;
 199             break;
 200
 201         case SB_THUMBTRACK:
 202             nScrollInc = trackPos - position;
 203             scrollEvent = wxEVT_SCROLL_THUMBTRACK;
 204             break;
 205
 206         case SB_ENDSCROLL:
 207             nScrollInc = 0;
 208             scrollEvent = wxEVT_SCROLL_ENDSCROLL;
 209             break;
 210
 211         default:
 212             nScrollInc = 0;
 213     }
 214
 215     if ( nScrollInc )
 216     {
 217         position += nScrollInc;
 218
 219         if ( position < 0 )
 220             position = 0;
 221         if ( position > maxPos )
 222             position = maxPos;
 223
 224         SetThumbPosition(position);
 225     }
 226     else if ( scrollEvent != wxEVT_SCROLL_THUMBRELEASE &&
 227                 scrollEvent != wxEVT_SCROLL_ENDSCROLL )
 228     {
 229         // don't process the event if there is no displacement,
 230         // unless this is a thumb release or end scroll event.
 231         return false;
 232     }
 233
 234     wxScrollEvent event(scrollEvent, m_windowId);
 235     event.SetOrientation(IsVertical() ? wxVERTICAL : wxHORIZONTAL);
 236     event.SetPosition(position);
 237     event.SetEventObject( this );
 238
 239     return GetEventHandler()->ProcessEvent(event);
 240 }
 241
 242 void wxScrollBar::SetThumbPosition(int viewStart)
 243 {
 244 #if defined(__WIN95__)
 245     SCROLLINFO info;
 246     info.cbSize = sizeof(SCROLLINFO);
 247     info.nPage = 0;
 248     info.nMin = 0;
 249     info.nPos = viewStart;
 250     info.fMask = SIF_POS ;
 251
 252     ::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, TRUE);
 253 #else
 254     ::SetScrollPos((HWND) GetHWND(), SB_CTL, viewStart, TRUE);
 255 #endif
 256 }
 257
 258 int wxScrollBar::GetThumbPosition(void) const
 259 {
 260     SCROLLINFO scrollInfo;
 261     wxZeroMemory(scrollInfo);
 262     scrollInfo.cbSize = sizeof(SCROLLINFO);
 263     scrollInfo.fMask = SIF_POS;
 264
 265     if ( !::GetScrollInfo(GetHwnd(), SB_CTL, &scrollInfo) )
 266     {
 267         wxLogLastError(_T("GetScrollInfo"));
 268     }
 269     return scrollInfo.nPos;
 270 //    return ::GetScrollPos((HWND)m_hWnd, SB_CTL);
 271 }
 272
 273 void wxScrollBar::SetScrollbar(int position, int thumbSize, int range, int pageSize,
 274     bool refresh)
 275 {
 276   m_viewSize = pageSize;
 277   m_pageSize = thumbSize;
 278   m_objectSize = range;
 279
 280   // The range (number of scroll steps) is the
 281   // object length minus the page size.
 282   int range1 = wxMax((m_objectSize - m_pageSize), 0) ;
 283
 284 #if defined(__WIN95__)
 285   // Try to adjust the range to cope with page size > 1
 286   // (see comment for SetPageLength)
 287   if ( m_pageSize > 1 )
 288   {
 289     range1 += (m_pageSize - 1);
 290   }
 291
 292   SCROLLINFO info;
 293   info.cbSize = sizeof(SCROLLINFO);
 294   info.nPage = m_pageSize;
 295   info.nMin = 0;
 296   info.nMax = range1;
 297   info.nPos = position;
 298
 299   info.fMask = SIF_PAGE | SIF_RANGE | SIF_POS;
 300
 301   ::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, refresh);
 302 #else
 303   ::SetScrollPos((HWND)m_hWnd, SB_CTL, position, refresh);
 304   ::SetScrollRange((HWND)m_hWnd, SB_CTL, 0, range1, refresh);
 305 #endif
 306 }
 307
 308 void wxScrollBar::Command(wxCommandEvent& event)
 309 {
 310     SetThumbPosition(event.GetInt());
 311     ProcessCommand(event);
 312 }
 313
 314 wxSize wxScrollBar::DoGetBestSize() const
 315 {
 316     int w = 100;
 317     int h = 100;
 318
 319     if ( IsVertical() )
 320     {
 321         w = wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
 322     }
 323     else
 324     {
 325         h = wxSystemSettings::GetMetric(wxSYS_HSCROLL_Y);
 326     }
 327
 328     wxSize best(w, h);
 329     CacheBestSize(best);
 330     return best;
 331 }
 332
 333 WXDWORD wxScrollBar::MSWGetStyle(long style, WXDWORD *exstyle) const
 334 {
 335     // we never have an external border
 336     WXDWORD msStyle = wxControl::MSWGetStyle
 337                       (
 338                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 339                       );
 340
 341     // SBS_HORZ is 0 anyhow, but do mention it explicitly for clarity
 342     msStyle |= style & wxSB_HORIZONTAL ? SBS_HORZ : SBS_VERT;
 343
 344     return msStyle;
 345 }
 346
 347 #endif // wxUSE_SCROLLBAR