src/msw/scrolbar.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/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 // For compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_SCROLLBAR
  20
  21 #ifndef WX_PRECOMP
  22     #include "wx/utils.h"
  23 #endif
  24
  25 #include "wx/scrolbar.h"
  26 #include "wx/msw/private.h"
  27 #include "wx/settings.h"
  28
  29 #if wxUSE_EXTENDED_RTTI
  30 WX_DEFINE_FLAGS( wxScrollBarStyle )
  31
  32 wxBEGIN_FLAGS( wxScrollBarStyle )
  33     // new style border flags, we put them first to
  34     // use them for streaming out
  35     wxFLAGS_MEMBER(wxBORDER_SIMPLE)
  36     wxFLAGS_MEMBER(wxBORDER_SUNKEN)
  37     wxFLAGS_MEMBER(wxBORDER_DOUBLE)
  38     wxFLAGS_MEMBER(wxBORDER_RAISED)
  39     wxFLAGS_MEMBER(wxBORDER_STATIC)
  40     wxFLAGS_MEMBER(wxBORDER_NONE)
  41
  42     // old style border flags
  43     wxFLAGS_MEMBER(wxSIMPLE_BORDER)
  44     wxFLAGS_MEMBER(wxSUNKEN_BORDER)
  45     wxFLAGS_MEMBER(wxDOUBLE_BORDER)
  46     wxFLAGS_MEMBER(wxRAISED_BORDER)
  47     wxFLAGS_MEMBER(wxSTATIC_BORDER)
  48     wxFLAGS_MEMBER(wxBORDER)
  49
  50     // standard window styles
  51     wxFLAGS_MEMBER(wxTAB_TRAVERSAL)
  52     wxFLAGS_MEMBER(wxCLIP_CHILDREN)
  53     wxFLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  54     wxFLAGS_MEMBER(wxWANTS_CHARS)
  55     wxFLAGS_MEMBER(wxFULL_REPAINT_ON_RESIZE)
  56     wxFLAGS_MEMBER(wxALWAYS_SHOW_SB )
  57     wxFLAGS_MEMBER(wxVSCROLL)
  58     wxFLAGS_MEMBER(wxHSCROLL)
  59
  60     wxFLAGS_MEMBER(wxSB_HORIZONTAL)
  61     wxFLAGS_MEMBER(wxSB_VERTICAL)
  62
  63 wxEND_FLAGS( wxScrollBarStyle )
  64
  65 IMPLEMENT_DYNAMIC_CLASS_XTI(wxScrollBar, wxControl,"wx/scrolbar.h")
  66
  67 wxBEGIN_PROPERTIES_TABLE(wxScrollBar)
  68     wxEVENT_RANGE_PROPERTY( Scroll , wxEVT_SCROLL_TOP , wxEVT_SCROLL_CHANGED , wxScrollEvent )
  69
  70     wxPROPERTY( ThumbPosition , int , SetThumbPosition, GetThumbPosition, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  71     wxPROPERTY( Range , int , SetRange, GetRange, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  72     wxPROPERTY( ThumbSize , int , SetThumbSize, GetThumbSize, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  73     wxPROPERTY( PageSize , int , SetPageSize, GetPageSize, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  74     wxPROPERTY_FLAGS( WindowStyle , wxScrollBarStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , EMPTY_MACROVALUE , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  75 wxEND_PROPERTIES_TABLE()
  76
  77 wxBEGIN_HANDLERS_TABLE(wxScrollBar)
  78 wxEND_HANDLERS_TABLE()
  79
  80 wxCONSTRUCTOR_5( wxScrollBar , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size , long , WindowStyle )
  81 #else
  82 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar, wxControl)
  83 #endif
  84
  85 // Scrollbar
  86 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
  87            const wxPoint& pos,
  88            const wxSize& size, long style,
  89            const wxValidator& validator,
  90            const wxString& name)
  91 {
  92     if ( !CreateControl(parent, id, pos, size, style, validator, name) )
  93         return false;
  94
  95     if (!MSWCreateControl(wxT("ScrollBar"), wxEmptyString, pos, size))
  96         return false;
  97
  98     SetScrollbar(0, 1, 2, 1, false);
  99
 100     return true;
 101 }
 102
 103 wxScrollBar::~wxScrollBar(void)
 104 {
 105 }
 106
 107 bool wxScrollBar::MSWOnScroll(int WXUNUSED(orientation), WXWORD wParam,
 108                               WXWORD pos, WXHWND WXUNUSED(control))
 109 {
 110     // current and max positions
 111     int position,
 112         maxPos, trackPos = pos;
 113
 114     wxUnusedVar(trackPos);
 115
 116     // when we're dragging the scrollbar we can't use pos parameter because it
 117     // is limited to 16 bits
 118     // JACS: now always using GetScrollInfo, since there's no reason
 119     // not to
 120 //    if ( wParam == SB_THUMBPOSITION || wParam == SB_THUMBTRACK )
 121     {
 122         SCROLLINFO scrollInfo;
 123         wxZeroMemory(scrollInfo);
 124         scrollInfo.cbSize = sizeof(SCROLLINFO);
 125
 126         // also get the range if we call GetScrollInfo() anyhow -- this is less
 127         // expensive than call it once here and then call GetScrollRange()
 128         // below
 129         scrollInfo.fMask = SIF_RANGE | SIF_POS | SIF_TRACKPOS;
 130
 131         if ( !::GetScrollInfo(GetHwnd(), SB_CTL, &scrollInfo) )
 132         {
 133             wxLogLastError(_T("GetScrollInfo"));
 134         }
 135
 136         trackPos = scrollInfo.nTrackPos;
 137         position = scrollInfo.nPos;
 138         maxPos = scrollInfo.nMax;
 139     }
 140 #if 0
 141     else
 142     {
 143         position = ::GetScrollPos((HWND) control, SB_CTL);
 144         int minPos;
 145         ::GetScrollRange((HWND) control, SB_CTL, &minPos, &maxPos);
 146     }
 147 #endif
 148
 149     // A page size greater than one has the effect of reducing the effective
 150     // range, therefore the range has already been boosted artificially - so
 151     // reduce it again.
 152     if ( m_pageSize > 1 )
 153         maxPos -= (m_pageSize - 1);
 154
 155     wxEventType scrollEvent = wxEVT_NULL;
 156
 157     int nScrollInc;
 158     switch ( wParam )
 159     {
 160         case SB_BOTTOM:
 161             nScrollInc = maxPos - position;
 162             scrollEvent = wxEVT_SCROLL_TOP;
 163             break;
 164
 165         case SB_TOP:
 166             nScrollInc = -position;
 167             scrollEvent = wxEVT_SCROLL_BOTTOM;
 168             break;
 169
 170         case SB_LINEUP:
 171             nScrollInc = -1;
 172             scrollEvent = wxEVT_SCROLL_LINEUP;
 173             break;
 174
 175         case SB_LINEDOWN:
 176             nScrollInc = 1;
 177             scrollEvent = wxEVT_SCROLL_LINEDOWN;
 178             break;
 179
 180         case SB_PAGEUP:
 181             nScrollInc = -GetPageSize();
 182             scrollEvent = wxEVT_SCROLL_PAGEUP;
 183             break;
 184
 185         case SB_PAGEDOWN:
 186             nScrollInc = GetPageSize();
 187             scrollEvent = wxEVT_SCROLL_PAGEDOWN;
 188             break;
 189
 190         case SB_THUMBPOSITION:
 191             nScrollInc = trackPos - position;
 192             scrollEvent = wxEVT_SCROLL_THUMBRELEASE;
 193             break;
 194
 195         case SB_THUMBTRACK:
 196             nScrollInc = trackPos - position;
 197             scrollEvent = wxEVT_SCROLL_THUMBTRACK;
 198             break;
 199
 200         case SB_ENDSCROLL:
 201             nScrollInc = 0;
 202             scrollEvent = wxEVT_SCROLL_CHANGED;
 203             break;
 204
 205         default:
 206             nScrollInc = 0;
 207     }
 208
 209     if ( nScrollInc )
 210     {
 211         position += nScrollInc;
 212
 213         if ( position < 0 )
 214             position = 0;
 215         if ( position > maxPos )
 216             position = maxPos;
 217
 218         SetThumbPosition(position);
 219     }
 220     else if ( scrollEvent != wxEVT_SCROLL_THUMBRELEASE &&
 221                 scrollEvent != wxEVT_SCROLL_CHANGED )
 222     {
 223         // don't process the event if there is no displacement,
 224         // unless this is a thumb release or end scroll event.
 225         return false;
 226     }
 227
 228     wxScrollEvent event(scrollEvent, m_windowId);
 229     event.SetOrientation(IsVertical() ? wxVERTICAL : wxHORIZONTAL);
 230     event.SetPosition(position);
 231     event.SetEventObject( this );
 232
 233     return GetEventHandler()->ProcessEvent(event);
 234 }
 235
 236 void wxScrollBar::SetThumbPosition(int viewStart)
 237 {
 238     SCROLLINFO info;
 239     info.cbSize = sizeof(SCROLLINFO);
 240     info.nPage = 0;
 241     info.nMin = 0;
 242     info.nPos = viewStart;
 243     info.fMask = SIF_POS ;
 244
 245     ::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, TRUE);
 246 }
 247
 248 int wxScrollBar::GetThumbPosition(void) const
 249 {
 250     SCROLLINFO scrollInfo;
 251     wxZeroMemory(scrollInfo);
 252     scrollInfo.cbSize = sizeof(SCROLLINFO);
 253     scrollInfo.fMask = SIF_POS;
 254
 255     if ( !::GetScrollInfo(GetHwnd(), SB_CTL, &scrollInfo) )
 256     {
 257         wxLogLastError(_T("GetScrollInfo"));
 258     }
 259     return scrollInfo.nPos;
 260 //    return ::GetScrollPos((HWND)m_hWnd, SB_CTL);
 261 }
 262
 263 void wxScrollBar::SetScrollbar(int position, int thumbSize, int range, int pageSize,
 264     bool refresh)
 265 {
 266     m_viewSize = pageSize;
 267     m_pageSize = thumbSize;
 268     m_objectSize = range;
 269
 270     // The range (number of scroll steps) is the
 271     // object length minus the page size.
 272     int range1 = wxMax((m_objectSize - m_pageSize), 0) ;
 273
 274     // Try to adjust the range to cope with page size > 1
 275     // (see comment for SetPageLength)
 276     if ( m_pageSize > 1 )
 277     {
 278         range1 += (m_pageSize - 1);
 279     }
 280
 281     SCROLLINFO info;
 282     info.cbSize = sizeof(SCROLLINFO);
 283     info.nPage = m_pageSize;
 284     info.nMin = 0;
 285     info.nMax = range1;
 286     info.nPos = position;
 287
 288     info.fMask = SIF_PAGE | SIF_RANGE | SIF_POS;
 289
 290     ::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, refresh);
 291 }
 292
 293 void wxScrollBar::Command(wxCommandEvent& event)
 294 {
 295     SetThumbPosition(event.GetInt());
 296     ProcessCommand(event);
 297 }
 298
 299 wxSize wxScrollBar::DoGetBestSize() const
 300 {
 301     int w = 100;
 302     int h = 100;
 303
 304     if ( IsVertical() )
 305     {
 306         w = wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
 307     }
 308     else
 309     {
 310         h = wxSystemSettings::GetMetric(wxSYS_HSCROLL_Y);
 311     }
 312
 313     wxSize best(w, h);
 314     CacheBestSize(best);
 315     return best;
 316 }
 317
 318 WXDWORD wxScrollBar::MSWGetStyle(long style, WXDWORD *exstyle) const
 319 {
 320     // we never have an external border
 321     WXDWORD msStyle = wxControl::MSWGetStyle
 322                       (
 323                         (style & ~wxBORDER_MASK) | wxBORDER_NONE, exstyle
 324                       );
 325
 326     // SBS_HORZ is 0 anyhow, but do mention it explicitly for clarity
 327     msStyle |= style & wxSB_HORIZONTAL ? SBS_HORZ : SBS_VERT;
 328
 329     return msStyle;
 330 }
 331
 332 WXHBRUSH wxScrollBar::MSWControlColor(WXHDC pDC, WXHWND hWnd)
 333 {
 334     // unless we have an explicitly set bg colour, use default (gradient under
 335     // XP) brush instead of GetBackgroundColour() one as the base class would
 336     //
 337     // note that fg colour isn't used for a scrollbar
 338     return UseBgCol() ? wxControl::MSWControlColor(pDC, hWnd) : NULL;
 339 }
 340
 341 #endif // wxUSE_SCROLLBAR