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