src/gtk/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/scrolwin.cpp
   3 // Purpose:     wxScrolledWindow implementation
   4 // Author:      Robert Roebling
   5 // Modified by: Ron Lee
   6 //              Vadim Zeitlin: removed 90% of duplicated common code
   7 // Created:     01/02/97
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) Robert Roebling
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 // ============================================================================
  14 // declarations
  15 // ============================================================================
  16
  17 // ----------------------------------------------------------------------------
  18 // headers
  19 // ----------------------------------------------------------------------------
  20
  21 // For compilers that support precompilation, includes "wx.h".
  22 #include "wx/wxprec.h"
  23
  24 #ifdef __BORLANDC__
  25     #pragma hdrstop
  26 #endif
  27
  28 #include "wx/scrolwin.h"
  29 #include "wx/gtk/private.h"
  30
  31 // ============================================================================
  32 // implementation
  33 // ============================================================================
  34
  35 // ----------------------------------------------------------------------------
  36 // wxScrollHelper implementation
  37 // ----------------------------------------------------------------------------
  38
  39 void wxScrollHelperNative::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
  40                                          int noUnitsX, int noUnitsY,
  41                                          int xPos, int yPos,
  42                                          bool noRefresh)
  43 {
  44     int xs, ys;
  45     GetViewStart(& xs, & ys);
  46
  47     int old_x = m_xScrollPixelsPerLine * xs;
  48     int old_y = m_yScrollPixelsPerLine * ys;
  49
  50     m_xScrollPixelsPerLine = pixelsPerUnitX;
  51     m_yScrollPixelsPerLine = pixelsPerUnitY;
  52
  53     m_win->m_hAdjust->value = m_xScrollPosition = xPos;
  54     m_win->m_vAdjust->value = m_yScrollPosition = yPos;
  55
  56     // Setting hints here should arguably be deprecated, but without it
  57     // a sizer might override this manual scrollbar setting in old code.
  58     // m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
  59
  60     int w = noUnitsX * pixelsPerUnitX;
  61     int h = noUnitsY * pixelsPerUnitY;
  62     m_targetWindow->SetVirtualSize( w ? w : wxDefaultCoord,
  63                                     h ? h : wxDefaultCoord);
  64
  65     if (!noRefresh)
  66     {
  67         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
  68         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
  69
  70         m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
  71     }
  72
  73     m_targetWindow->m_hasScrolling = pixelsPerUnitX || pixelsPerUnitY;
  74 }
  75
  76 void wxScrollHelperNative::DoAdjustScrollbar(GtkAdjustment *adj,
  77                                              int pixelsPerLine,
  78                                              int winSize,
  79                                              int virtSize,
  80                                              int *pos,
  81                                              int *lines,
  82                                              int *linesPerPage)
  83 {
  84     if ( pixelsPerLine == 0 || winSize >= virtSize)
  85     {
  86         if ( !wxIsNullDouble(adj->value) )
  87         {
  88             adj->value = 0.0;
  89             g_signal_emit_by_name (adj, "value_changed");
  90         }
  91
  92         adj->upper = 1.0;
  93         adj->page_increment = 1.0;
  94         adj->page_size = 1.0;
  95     }
  96     else // we do have scrollbar
  97     {
  98         // round because we need to show all the items
  99         adj->upper = (virtSize + pixelsPerLine - 1) / pixelsPerLine;
 100
 101         // truncate here as we want to show visible lines entirely
 102         adj->page_size =
 103         adj->page_increment = winSize / pixelsPerLine;
 104
 105         // If the scrollbar hits the right side, move the window
 106         // right to keep it from over extending.
 107         if ( !wxIsNullDouble(adj->value) &&
 108                 (adj->value + adj->page_size > adj->upper) )
 109         {
 110             adj->value = adj->upper - adj->page_size;
 111             if (adj->value < 0.0)
 112                 adj->value = 0.0;
 113
 114             g_signal_emit_by_name (adj, "value_changed");
 115         }
 116     }
 117
 118     *lines = (int)(adj->upper + 0.5);
 119     *linesPerPage = (int)(adj->page_increment + 0.5);
 120     g_signal_emit_by_name (adj, "changed");
 121 }
 122
 123 void wxScrollHelperNative::AdjustScrollbars()
 124 {
 125     int w, h;
 126     int vw, vh;
 127
 128     m_targetWindow->GetClientSize( &w, &h );
 129     m_targetWindow->GetVirtualSize( &vw, &vh );
 130
 131     DoAdjustScrollbar(m_win->m_hAdjust, m_xScrollPixelsPerLine, w, vw,
 132                       &m_xScrollPosition, &m_xScrollLines, &m_xScrollLinesPerPage);
 133     DoAdjustScrollbar(m_win->m_vAdjust, m_yScrollPixelsPerLine, h, vh,
 134                       &m_yScrollPosition, &m_yScrollLines, &m_yScrollLinesPerPage);
 135 }
 136
 137 void wxScrollHelperNative::DoScroll(int orient,
 138                                     GtkAdjustment *adj,
 139                                     int pos,
 140                                     int pixelsPerLine,
 141                                     int *posOld)
 142 {
 143     if ( pos != -1 && pos != *posOld && pixelsPerLine )
 144     {
 145         int max = (int)(adj->upper - adj->page_size + 0.5);
 146         if (max < 0)
 147             max = 0;
 148         if (pos > max)
 149             pos = max;
 150         if (pos < 0)
 151             pos = 0;
 152
 153         adj->value = pos;
 154
 155         int diff = (*posOld - pos)*pixelsPerLine;
 156         m_targetWindow->ScrollWindow(orient == wxHORIZONTAL ? diff : 0,
 157                                      orient == wxHORIZONTAL ? 0 : diff);
 158
 159         *posOld = pos;
 160
 161         m_win->GtkUpdateScrollbar(orient);
 162     }
 163 }
 164
 165 void wxScrollHelperNative::Scroll( int x_pos, int y_pos )
 166 {
 167     wxCHECK_RET( m_targetWindow != 0, _T("No target window") );
 168
 169     DoScroll(wxHORIZONTAL, m_win->m_hAdjust, x_pos, m_xScrollPixelsPerLine,
 170                 &m_xScrollPosition);
 171     DoScroll(wxVERTICAL, m_win->m_vAdjust, y_pos, m_yScrollPixelsPerLine,
 172                 &m_yScrollPosition);
 173 }
 174