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 #ifdef __GNUG__
  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 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar, wxControl)
  33
  34 BEGIN_EVENT_TABLE(wxScrollBar, wxControl)
  35 #if WXWIN_COMPATIBILITY
  36   EVT_SCROLL(wxScrollBar::OnScroll)
  37 #endif
  38 END_EVENT_TABLE()
  39
  40
  41 // Scrollbar
  42 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
  43            const wxPoint& pos,
  44            const wxSize& size, long style,
  45            const wxValidator& validator,
  46            const wxString& name)
  47 {
  48     if (!parent)
  49         return FALSE;
  50     parent->AddChild(this);
  51     SetName(name);
  52 #if wxUSE_VALIDATORS
  53     SetValidator(validator);
  54 #endif // wxUSE_VALIDATORS
  55
  56     SetBackgroundColour(parent->GetBackgroundColour()) ;
  57     SetForegroundColour(parent->GetForegroundColour()) ;
  58     m_windowStyle = style;
  59
  60   if ( id == -1 )
  61       m_windowId = (int)NewControlId();
  62   else
  63     m_windowId = id;
  64
  65   int x = pos.x;
  66   int y = pos.y;
  67   int width = size.x;
  68   int height = size.y;
  69
  70     if (width == -1)
  71     {
  72       if (style & wxHORIZONTAL)
  73         width = 140;
  74       else
  75         width = 14;
  76     }
  77     if (height == -1)
  78     {
  79       if (style & wxVERTICAL)
  80         height = 140;
  81       else
  82         height = 14;
  83     }
  84
  85     DWORD wstyle = WS_VISIBLE | WS_CHILD;
  86
  87     if ( m_windowStyle & wxCLIP_SIBLINGS )
  88       wstyle |= WS_CLIPSIBLINGS;
  89
  90     // Now create scrollbar
  91     DWORD _direction = (style & wxHORIZONTAL) ?
  92                         SBS_HORZ: SBS_VERT;
  93     HWND scroll_bar = CreateWindowEx(MakeExtendedStyle(style), wxT("SCROLLBAR"), wxT("scrollbar"),
  94                          _direction | wstyle,
  95                          0, 0, 0, 0, (HWND) parent->GetHWND(), (HMENU)m_windowId,
  96                          wxGetInstance(), NULL);
  97
  98     m_pageSize = 1;
  99     m_viewSize = 1;
 100     m_objectSize = 1;
 101
 102     ::SetScrollRange(scroll_bar, SB_CTL, 0, 1, FALSE);
 103     ::SetScrollPos(scroll_bar, SB_CTL, 0, FALSE);
 104     ShowWindow(scroll_bar, SW_SHOW);
 105
 106     SetFont(parent->GetFont());
 107
 108     m_hWnd = (WXHWND)scroll_bar;
 109
 110     // Subclass again for purposes of dialog editing mode
 111     SubclassWin((WXHWND) scroll_bar);
 112
 113     SetSize(x, y, width, height);
 114
 115     return TRUE;
 116 }
 117
 118 wxScrollBar::~wxScrollBar(void)
 119 {
 120 }
 121
 122 bool wxScrollBar::MSWOnScroll(int WXUNUSED(orientation), WXWORD wParam,
 123                               WXWORD pos, WXHWND control)
 124 {
 125     // current and max positions
 126     int position,
 127         maxPos, trackPos = pos;
 128
 129 #ifdef __WIN32__
 130     // when we're dragging the scrollbar we can't use pos parameter because it
 131     // is limited to 16 bits
 132     if ( wParam == SB_THUMBPOSITION || wParam == SB_THUMBTRACK )
 133     {
 134         SCROLLINFO scrollInfo;
 135         wxZeroMemory(scrollInfo);
 136         scrollInfo.cbSize = sizeof(SCROLLINFO);
 137
 138         // also get the range if we call GetScrollInfo() anyhow -- this is less
 139         // expensive than call it once here and then call GetScrollRange()
 140         // below
 141         scrollInfo.fMask = SIF_RANGE | SIF_POS | SIF_TRACKPOS;
 142
 143         if ( !::GetScrollInfo(GetHwnd(), SB_CTL, &scrollInfo) )
 144         {
 145             wxLogLastError(_T("GetScrollInfo"));
 146         }
 147
 148         trackPos = scrollInfo.nTrackPos;
 149         position = scrollInfo.nPos;
 150         maxPos = scrollInfo.nMax;
 151     }
 152     else
 153 #endif // Win32
 154     {
 155         position = ::GetScrollPos((HWND) control, SB_CTL);
 156         int minPos;
 157         ::GetScrollRange((HWND) control, SB_CTL, &minPos, &maxPos);
 158     }
 159
 160 #if defined(__WIN95__)
 161     // A page size greater than one has the effect of reducing the effective
 162     // range, therefore the range has already been boosted artificially - so
 163     // reduce it again.
 164     if ( m_pageSize > 1 )
 165         maxPos -= (m_pageSize - 1);
 166 #endif // __WIN95__
 167
 168     wxEventType scrollEvent = wxEVT_NULL;
 169
 170     int nScrollInc;
 171     switch ( wParam )
 172     {
 173         case SB_BOTTOM:
 174             nScrollInc = maxPos - position;
 175             scrollEvent = wxEVT_SCROLL_TOP;
 176             break;
 177
 178         case SB_TOP:
 179             nScrollInc = -position;
 180             scrollEvent = wxEVT_SCROLL_BOTTOM;
 181             break;
 182
 183         case SB_LINEUP:
 184             nScrollInc = -1;
 185             scrollEvent = wxEVT_SCROLL_LINEUP;
 186             break;
 187
 188         case SB_LINEDOWN:
 189             nScrollInc = 1;
 190             scrollEvent = wxEVT_SCROLL_LINEDOWN;
 191             break;
 192
 193         case SB_PAGEUP:
 194             nScrollInc = -GetPageSize();
 195             scrollEvent = wxEVT_SCROLL_PAGEUP;
 196             break;
 197
 198         case SB_PAGEDOWN:
 199             nScrollInc = GetPageSize();
 200             scrollEvent = wxEVT_SCROLL_PAGEDOWN;
 201             break;
 202
 203         case SB_THUMBPOSITION:
 204             nScrollInc = trackPos - position;
 205             scrollEvent = wxEVT_SCROLL_THUMBRELEASE;
 206             break;
 207
 208         case SB_THUMBTRACK:
 209             nScrollInc = trackPos - position;
 210             scrollEvent = wxEVT_SCROLL_THUMBTRACK;
 211             break;
 212
 213         case SB_ENDSCROLL:
 214             nScrollInc = 0;
 215             scrollEvent = wxEVT_SCROLL_ENDSCROLL;
 216             break;
 217
 218         default:
 219             nScrollInc = 0;
 220     }
 221
 222     if ( nScrollInc )
 223     {
 224         position += nScrollInc;
 225
 226         if ( position < 0 )
 227             position = 0;
 228         if ( position > maxPos )
 229             position = maxPos;
 230
 231         SetThumbPosition(position);
 232     }
 233     else if ( scrollEvent != wxEVT_SCROLL_THUMBRELEASE &&
 234                 scrollEvent != wxEVT_SCROLL_ENDSCROLL )
 235     {
 236         // don't process the event if there is no displacement,
 237         // unless this is a thumb release or end scroll event.
 238         return FALSE;
 239     }
 240
 241     wxScrollEvent event(scrollEvent, m_windowId);
 242     event.SetOrientation(IsVertical() ? wxVERTICAL : wxHORIZONTAL);
 243     event.SetPosition(position);
 244     event.SetEventObject( this );
 245
 246     return GetEventHandler()->ProcessEvent(event);
 247 }
 248
 249 void wxScrollBar::SetThumbPosition(int viewStart)
 250 {
 251 #if defined(__WIN95__)
 252     SCROLLINFO info;
 253     info.cbSize = sizeof(SCROLLINFO);
 254     info.nPage = 0;
 255     info.nMin = 0;
 256     info.nPos = viewStart;
 257     info.fMask = SIF_POS ;
 258
 259     ::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, TRUE);
 260 #else
 261     ::SetScrollPos((HWND) GetHWND(), SB_CTL, viewStart, TRUE);
 262 #endif
 263 }
 264
 265 int wxScrollBar::GetThumbPosition(void) const
 266 {
 267     return ::GetScrollPos((HWND)m_hWnd, SB_CTL);
 268 }
 269
 270 void wxScrollBar::SetScrollbar(int position, int thumbSize, int range, int pageSize,
 271     bool refresh)
 272 {
 273   m_viewSize = pageSize;
 274   m_pageSize = thumbSize;
 275   m_objectSize = range;
 276
 277   // The range (number of scroll steps) is the
 278   // object length minus the page size.
 279   int range1 = wxMax((m_objectSize - m_pageSize), 0) ;
 280
 281 #if defined(__WIN95__)
 282   // Try to adjust the range to cope with page size > 1
 283   // (see comment for SetPageLength)
 284   if ( m_pageSize > 1 )
 285   {
 286     range1 += (m_pageSize - 1);
 287   }
 288
 289   SCROLLINFO info;
 290   info.cbSize = sizeof(SCROLLINFO);
 291   info.nPage = m_pageSize;
 292   info.nMin = 0;
 293   info.nMax = range1;
 294   info.nPos = position;
 295
 296   info.fMask = SIF_PAGE | SIF_RANGE | SIF_POS;
 297
 298   ::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, refresh);
 299 #else
 300   ::SetScrollPos((HWND)m_hWnd, SB_CTL, position, TRUE);
 301   ::SetScrollRange((HWND)m_hWnd, SB_CTL, 0, range1, TRUE);
 302 #endif
 303 }
 304
 305
 306 /* From the WIN32 documentation:
 307 In version 4.0 or later, the maximum value that a scroll bar can report
 308 (that is, the maximum scrolling position) depends on the page size.
 309 If the scroll bar has a page size greater than one, the maximum scrolling position
 310 is less than the maximum range value. You can use the following formula to calculate
 311 the maximum scrolling position:
 312
 313 MaxScrollPos = MaxRangeValue - (PageSize - 1)
 314 */
 315
 316 #if WXWIN_COMPATIBILITY
 317 void wxScrollBar::SetPageSize(int pageLength)
 318 {
 319   m_pageSize = pageLength;
 320
 321 #if defined(__WIN95__)
 322   SCROLLINFO info;
 323   info.cbSize = sizeof(SCROLLINFO);
 324   info.nPage = pageLength;
 325   info.fMask = SIF_PAGE ;
 326
 327   ::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, TRUE);
 328 #endif
 329 }
 330
 331 void wxScrollBar::SetObjectLength(int objectLength)
 332 {
 333   m_objectSize = objectLength;
 334
 335   // The range (number of scroll steps) is the
 336   // object length minus the view size.
 337   int range = wxMax((objectLength - m_viewSize), 0) ;
 338
 339 #if defined(__WIN95__)
 340   // Try to adjust the range to cope with page size > 1
 341   // (see comment for SetPageLength)
 342   if ( m_pageSize > 1 )
 343   {
 344     range += (m_pageSize - 1);
 345   }
 346
 347   SCROLLINFO info;
 348   info.cbSize = sizeof(SCROLLINFO);
 349   info.nPage = 0;
 350   info.nMin = 0;
 351   info.nMax = range;
 352   info.nPos = 0;
 353   info.fMask = SIF_RANGE ;
 354
 355   ::SetScrollInfo((HWND) GetHWND(), SB_CTL, &info, TRUE);
 356 #else
 357   ::SetScrollRange((HWND)m_hWnd, SB_CTL, 0, range, TRUE);
 358 #endif
 359 }
 360
 361 void wxScrollBar::SetViewLength(int viewLength)
 362 {
 363     m_viewSize = viewLength;
 364 }
 365
 366 void wxScrollBar::GetValues(int *viewStart, int *viewLength, int *objectLength,
 367            int *pageLength) const
 368 {
 369     *viewStart = ::GetScrollPos((HWND)m_hWnd, SB_CTL);
 370     *viewLength = m_viewSize;
 371     *objectLength = m_objectSize;
 372     *pageLength = m_pageSize;
 373 }
 374 #endif
 375
 376 WXHBRUSH wxScrollBar::OnCtlColor(WXHDC WXUNUSED(pDC), WXHWND WXUNUSED(pWnd), WXUINT WXUNUSED(nCtlColor),
 377             WXUINT WXUNUSED(message), WXWPARAM WXUNUSED(wParam), WXLPARAM WXUNUSED(lParam))
 378 {
 379   return 0;
 380 }
 381
 382 void wxScrollBar::Command(wxCommandEvent& event)
 383 {
 384     SetThumbPosition(event.m_commandInt);
 385     ProcessCommand(event);
 386 }
 387
 388 #if WXWIN_COMPATIBILITY
 389 // Backward compatibility
 390 void wxScrollBar::OnScroll(wxScrollEvent& event)
 391 {
 392     wxEventType oldEvent = event.GetEventType();
 393     event.SetEventType( wxEVT_COMMAND_SCROLLBAR_UPDATED );
 394     if ( !GetEventHandler()->ProcessEvent(event) )
 395     {
 396         event.SetEventType( oldEvent );
 397         if (!GetParent()->GetEventHandler()->ProcessEvent(event))
 398             event.Skip();
 399     }
 400 }
 401 #endif
 402
 403 #endif // wxUSE_SCROLLBAR