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
  32 #if wxUSE_EXTENDED_RTTI
  33 WX_DEFINE_FLAGS( wxScrollBarStyle )
  34
  35 WX_BEGIN_FLAGS( wxScrollBarStyle )
  36     // new style border flags, we put them first to
  37     // use them for streaming out
  38     WX_FLAGS_MEMBER(wxBORDER_SIMPLE)
  39     WX_FLAGS_MEMBER(wxBORDER_SUNKEN)
  40     WX_FLAGS_MEMBER(wxBORDER_DOUBLE)
  41     WX_FLAGS_MEMBER(wxBORDER_RAISED)
  42     WX_FLAGS_MEMBER(wxBORDER_STATIC)
  43     WX_FLAGS_MEMBER(wxBORDER_NONE)
  44
  45     // old style border flags
  46     WX_FLAGS_MEMBER(wxSIMPLE_BORDER)
  47     WX_FLAGS_MEMBER(wxSUNKEN_BORDER)
  48     WX_FLAGS_MEMBER(wxDOUBLE_BORDER)
  49     WX_FLAGS_MEMBER(wxRAISED_BORDER)
  50     WX_FLAGS_MEMBER(wxSTATIC_BORDER)
  51     WX_FLAGS_MEMBER(wxNO_BORDER)
  52
  53     // standard window styles
  54     WX_FLAGS_MEMBER(wxTAB_TRAVERSAL)
  55     WX_FLAGS_MEMBER(wxCLIP_CHILDREN)
  56     WX_FLAGS_MEMBER(wxTRANSPARENT_WINDOW)
  57     WX_FLAGS_MEMBER(wxWANTS_CHARS)
  58     WX_FLAGS_MEMBER(wxNO_FULL_REPAINT_ON_RESIZE)
  59     WX_FLAGS_MEMBER(wxALWAYS_SHOW_SB )
  60     WX_FLAGS_MEMBER(wxVSCROLL)
  61     WX_FLAGS_MEMBER(wxHSCROLL)
  62
  63     WX_FLAGS_MEMBER(wxSB_HORIZONTAL)
  64     WX_FLAGS_MEMBER(wxSB_VERTICAL)
  65
  66 WX_END_FLAGS( wxScrollBarStyle )
  67
  68 IMPLEMENT_DYNAMIC_CLASS_XTI(wxScrollBar, wxControl,"wx/scrolbar.h")
  69
  70 WX_BEGIN_PROPERTIES_TABLE(wxScrollBar)
  71     WX_EVENT_RANGE_PROPERTY( Scroll , wxEVT_SCROLL_TOP , wxEVT_SCROLL_ENDSCROLL , wxScrollEvent )
  72
  73     WX_PROPERTY( ThumbPosition , int , SetThumbPosition, GetThumbPosition, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  74         WX_PROPERTY( Range , int , SetRange, GetRange, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  75         WX_PROPERTY( ThumbSize , int , SetThumbSize, GetThumbSize, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  76         WX_PROPERTY( PageSize , int , SetPageSize, GetPageSize, 0 , 0 /*flags*/ , wxT("Helpstring") , wxT("group"))
  77     WX_PROPERTY_FLAGS( WindowStyle , wxScrollBarStyle , long , SetWindowStyleFlag , GetWindowStyleFlag , , 0 /*flags*/ , wxT("Helpstring") , wxT("group")) // style
  78 WX_END_PROPERTIES_TABLE()
  79
  80 WX_BEGIN_HANDLERS_TABLE(wxScrollBar)
  81 WX_END_HANDLERS_TABLE()
  82
  83 WX_CONSTRUCTOR_5( wxScrollBar , wxWindow* , Parent , wxWindowID , Id , wxPoint , Position , wxSize , Size , long , WindowStyle )
  84 #else
  85 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar, wxControl)
  86 #endif
  87
  88 // Scrollbar
  89 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
  90            const wxPoint& pos,
  91            const wxSize& size, long style,
  92            const wxValidator& validator,
  93            const wxString& name)
  94 {
  95     if (!parent)
  96         return FALSE;
  97     parent->AddChild(this);
  98     SetName(name);
  99 #if wxUSE_VALIDATORS
 100     SetValidator(validator);
 101 #endif // wxUSE_VALIDATORS
 102
 103     if ((style & wxBORDER_MASK) == wxBORDER_DEFAULT)
 104         style |= wxNO_BORDER;
 105
 106     SetBackgroundColour(parent->GetBackgroundColour()) ;
 107     SetForegroundColour(parent->GetForegroundColour()) ;
 108     m_windowStyle = style;
 109
 110   if ( id == -1 )
 111       m_windowId = (int)NewControlId();
 112   else
 113     m_windowId = id;
 114
 115   int x = pos.x;
 116   int y = pos.y;
 117   int width = size.x;
 118   int height = size.y;
 119
 120     if (width == -1)
 121     {
 122       if (style & wxHORIZONTAL)
 123         width = 140;
 124       else
 125         width = 14;
 126     }
 127     if (height == -1)
 128     {
 129       if (style & wxVERTICAL)
 130         height = 140;
 131       else
 132         height = 14;
 133     }
 134
 135     WXDWORD exStyle = 0;
 136     WXDWORD wstyle = MSWGetStyle(style, & exStyle) ;
 137
 138     // Now create scrollbar
 139     DWORD _direction = (style & wxHORIZONTAL) ?
 140                         SBS_HORZ: SBS_VERT;
 141     HWND scroll_bar = CreateWindowEx(exStyle, wxT("SCROLLBAR"), wxT("scrollbar"),
 142                          _direction | wstyle,
 143                          0, 0, 0, 0, (HWND) parent->GetHWND(), (HMENU)m_windowId,
 144                          wxGetInstance(), NULL);
 145
 146     m_pageSize = 1;
 147     m_viewSize = 1;
 148     m_objectSize = 1;
 149
 150     ::SetScrollRange(scroll_bar, SB_CTL, 0, 1, FALSE);
 151     ::SetScrollPos(scroll_bar, SB_CTL, 0, FALSE);
 152     ShowWindow(scroll_bar, SW_SHOW);
 153
 154     SetFont(parent->GetFont());
 155
 156     m_hWnd = (WXHWND)scroll_bar;
 157
 158     // Subclass again for purposes of dialog editing mode
 159     SubclassWin((WXHWND) scroll_bar);
 160
 161     SetSize(x, y, width, height);
 162
 163     return TRUE;
 164 }
 165
 166 wxScrollBar::~wxScrollBar(void)
 167 {
 168 }
 169
 170 bool wxScrollBar::MSWOnScroll(int WXUNUSED(orientation), WXWORD wParam,
 171                               WXWORD pos, WXHWND WXUNUSED(control))
 172 {
 173     // current and max positions
 174     int position,
 175         maxPos, trackPos = pos;
 176
 177     // when we're dragging the scrollbar we can't use pos parameter because it
 178     // is limited to 16 bits
 179     // JACS: now always using GetScrollInfo, since there's no reason
 180     // not to
 181 //    if ( wParam == SB_THUMBPOSITION || wParam == SB_THUMBTRACK )
 182     {
 183         SCROLLINFO scrollInfo;
 184         wxZeroMemory(scrollInfo);
 185         scrollInfo.cbSize = sizeof(SCROLLINFO);
 186
 187         // also get the range if we call GetScrollInfo() anyhow -- this is less
 188         // expensive than call it once here and then call GetScrollRange()
 189         // below
 190         scrollInfo.fMask = SIF_RANGE | SIF_POS | SIF_TRACKPOS;
 191
 192         if ( !::GetScrollInfo(GetHwnd(), SB_CTL, &scrollInfo) )
 193         {
 194             wxLogLastError(_T("GetScrollInfo"));
 195         }
 196
 197         trackPos = scrollInfo.nTrackPos;
 198         position = scrollInfo.nPos;
 199         maxPos = scrollInfo.nMax;
 200     }
 201 #if 0
 202     else
 203     {
 204         position = ::GetScrollPos((HWND) control, SB_CTL);
 205         int minPos;
 206         ::GetScrollRange((HWND) control, SB_CTL, &minPos, &maxPos);
 207     }
 208 #endif
 209
 210 #if defined(__WIN95__)
 211     // A page size greater than one has the effect of reducing the effective
 212     // range, therefore the range has already been boosted artificially - so
 213     // reduce it again.
 214     if ( m_pageSize > 1 )
 215         maxPos -= (m_pageSize - 1);
 216 #endif // __WIN95__
 217
 218     wxEventType scrollEvent = wxEVT_NULL;
 219
 220     int nScrollInc;
 221     switch ( wParam )
 222     {
 223         case SB_BOTTOM:
 224             nScrollInc = maxPos - position;
 225             scrollEvent = wxEVT_SCROLL_TOP;
 226             break;
 227
 228         case SB_TOP:
 229             nScrollInc = -position;
 230             scrollEvent = wxEVT_SCROLL_BOTTOM;
 231             break;
 232
 233         case SB_LINEUP:
 234             nScrollInc = -1;
 235             scrollEvent = wxEVT_SCROLL_LINEUP;
 236             break;
 237
 238         case SB_LINEDOWN:
 239             nScrollInc = 1;
 240             scrollEvent = wxEVT_SCROLL_LINEDOWN;
 241             break;
 242
 243         case SB_PAGEUP:
 244             nScrollInc = -GetPageSize();
 245             scrollEvent = wxEVT_SCROLL_PAGEUP;
 246             break;
 247
 248         case SB_PAGEDOWN:
 249             nScrollInc = GetPageSize();
 250             scrollEvent = wxEVT_SCROLL_PAGEDOWN;
 251             break;
 252
 253         case SB_THUMBPOSITION:
 254             nScrollInc = trackPos - position;
 255             scrollEvent = wxEVT_SCROLL_THUMBRELEASE;
 256             break;
 257
 258         case SB_THUMBTRACK:
 259             nScrollInc = trackPos - position;
 260             scrollEvent = wxEVT_SCROLL_THUMBTRACK;
 261             break;
 262
 263         case SB_ENDSCROLL:
 264             nScrollInc = 0;
 265             scrollEvent = wxEVT_SCROLL_ENDSCROLL;
 266             break;
 267
 268         default:
 269             nScrollInc = 0;
 270     }
 271
 272     if ( nScrollInc )
 273     {
 274         position += nScrollInc;
 275
 276         if ( position < 0 )
 277             position = 0;
 278         if ( position > maxPos )
 279             position = maxPos;
 280
 281         SetThumbPosition(position);
 282     }
 283     else if ( scrollEvent != wxEVT_SCROLL_THUMBRELEASE &&
 284                 scrollEvent != wxEVT_SCROLL_ENDSCROLL )
 285     {
 286         // don't process the event if there is no displacement,
 287         // unless this is a thumb release or end scroll event.
 288         return FALSE;
 289     }
 290
 291     wxScrollEvent event(scrollEvent, m_windowId);
 292     event.SetOrientation(IsVertical() ? wxVERTICAL : wxHORIZONTAL);
 293     event.SetPosition(position);
 294     event.SetEventObject( this );
 295
 296     return GetEventHandler()->ProcessEvent(event);
 297 }
 298
 299 void wxScrollBar::SetThumbPosition(int viewStart)
 300 {
 301 #if defined(__WIN95__)
 302     SCROLLINFO info;
 303     info.cbSize = sizeof(SCROLLINFO);
 304     info.nPage = 0;
 305     info.nMin = 0;
 306     info.nPos = viewStart;
 307     info.fMask = SIF_POS ;
 308
 309     ::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, TRUE);
 310 #else
 311     ::SetScrollPos((HWND) GetHWND(), SB_CTL, viewStart, TRUE);
 312 #endif
 313 }
 314
 315 int wxScrollBar::GetThumbPosition(void) const
 316 {
 317     SCROLLINFO scrollInfo;
 318     wxZeroMemory(scrollInfo);
 319     scrollInfo.cbSize = sizeof(SCROLLINFO);
 320     scrollInfo.fMask = SIF_POS;
 321
 322     if ( !::GetScrollInfo(GetHwnd(), SB_CTL, &scrollInfo) )
 323     {
 324         wxLogLastError(_T("GetScrollInfo"));
 325     }
 326     return scrollInfo.nPos;
 327 //    return ::GetScrollPos((HWND)m_hWnd, SB_CTL);
 328 }
 329
 330 void wxScrollBar::SetScrollbar(int position, int thumbSize, int range, int pageSize,
 331     bool refresh)
 332 {
 333   m_viewSize = pageSize;
 334   m_pageSize = thumbSize;
 335   m_objectSize = range;
 336
 337   // The range (number of scroll steps) is the
 338   // object length minus the page size.
 339   int range1 = wxMax((m_objectSize - m_pageSize), 0) ;
 340
 341 #if defined(__WIN95__)
 342   // Try to adjust the range to cope with page size > 1
 343   // (see comment for SetPageLength)
 344   if ( m_pageSize > 1 )
 345   {
 346     range1 += (m_pageSize - 1);
 347   }
 348
 349   SCROLLINFO info;
 350   info.cbSize = sizeof(SCROLLINFO);
 351   info.nPage = m_pageSize;
 352   info.nMin = 0;
 353   info.nMax = range1;
 354   info.nPos = position;
 355
 356   info.fMask = SIF_PAGE | SIF_RANGE | SIF_POS;
 357
 358   ::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, refresh);
 359 #else
 360   ::SetScrollPos((HWND)m_hWnd, SB_CTL, position, TRUE);
 361   ::SetScrollRange((HWND)m_hWnd, SB_CTL, 0, range1, TRUE);
 362 #endif
 363 }
 364
 365
 366 WXHBRUSH wxScrollBar::OnCtlColor(WXHDC WXUNUSED(pDC), WXHWND WXUNUSED(pWnd), WXUINT WXUNUSED(nCtlColor),
 367             WXUINT WXUNUSED(message), WXWPARAM WXUNUSED(wParam), WXLPARAM WXUNUSED(lParam))
 368 {
 369   return 0;
 370 }
 371
 372 void wxScrollBar::Command(wxCommandEvent& event)
 373 {
 374     SetThumbPosition(event.m_commandInt);
 375     ProcessCommand(event);
 376 }
 377
 378 #endif // wxUSE_SCROLLBAR