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 )
  85     {
  86         adj->upper = 1.0;
  87         adj->page_increment = 1.0;
  88         adj->page_size = 1.0;
  89     }
  90     else // we do have scrollbar
  91     {
  92         adj->upper = (virtSize + pixelsPerLine - 1) / pixelsPerLine;
  93         adj->page_size = winSize / pixelsPerLine;
  94         adj->page_increment = winSize / pixelsPerLine;
  95
  96         // Special case. When client and virtual size are very close but
  97         // the client is big enough, kill scrollbar.
  98
  99         if ((adj->page_size < adj->upper) && (winSize >= virtSize))
 100             adj->page_size += 1.0;
 101
 102         // If the scrollbar hits the right side, move the window
 103         // right to keep it from over extending.
 104
 105         if ( !wxIsNullDouble(adj->value) &&
 106                 (adj->value + adj->page_size > adj->upper) )
 107         {
 108             adj->value = adj->upper - adj->page_size;
 109             if (adj->value < 0.0)
 110                 adj->value = 0.0;
 111
 112             if ( m_win->GetChildren().empty() )
 113             {
 114                 // This is enough without child windows
 115                 *pos = (int)adj->value;
 116             }
 117             else
 118             {
 119                 // We need to actually scroll window
 120                 gtk_signal_emit_by_name( GTK_OBJECT(adj), "value_changed" );
 121             }
 122         }
 123     }
 124
 125     *lines = (int)(adj->upper + 0.5);
 126     *linesPerPage = (int)(adj->page_increment + 0.5);
 127     gtk_signal_emit_by_name( GTK_OBJECT(adj), "changed" );
 128 }
 129
 130 void wxScrollHelperNative::AdjustScrollbars()
 131 {
 132     int w, h;
 133     int vw, vh;
 134
 135     m_targetWindow->GetClientSize( &w, &h );
 136     m_targetWindow->GetVirtualSize( &vw, &vh );
 137
 138     DoAdjustScrollbar(m_win->m_hAdjust, m_xScrollPixelsPerLine, w, vw,
 139                       &m_xScrollPosition, &m_xScrollLines, &m_xScrollLinesPerPage);
 140     DoAdjustScrollbar(m_win->m_vAdjust, m_yScrollPixelsPerLine, h, vh,
 141                       &m_yScrollPosition, &m_yScrollLines, &m_yScrollLinesPerPage);
 142 }
 143
 144 void wxScrollHelperNative::DoScroll(int orient,
 145                                     GtkAdjustment *adj,
 146                                     int pos,
 147                                     int pixelsPerLine,
 148                                     int *posOld)
 149 {
 150     if ( pos != -1 && pos != *posOld && pixelsPerLine )
 151     {
 152         int max = (int)(adj->upper - adj->page_size + 0.5);
 153         if (max < 0)
 154             max = 0;
 155         if (pos > max)
 156             pos = max;
 157         if (pos < 0)
 158             pos = 0;
 159
 160         adj->value = pos;
 161
 162         int diff = (*posOld - pos)*pixelsPerLine;
 163         m_targetWindow->ScrollWindow(orient == wxHORIZONTAL ? diff : 0,
 164                                      orient == wxHORIZONTAL ? 0 : diff);
 165
 166         *posOld = pos;
 167
 168         m_win->GtkUpdateScrollbar(orient);
 169     }
 170 }
 171
 172 void wxScrollHelperNative::Scroll( int x_pos, int y_pos )
 173 {
 174     wxCHECK_RET( m_targetWindow != 0, _T("No target window") );
 175
 176     DoScroll(wxHORIZONTAL, m_win->m_hAdjust, x_pos, m_xScrollPixelsPerLine,
 177                 &m_xScrollPosition);
 178     DoScroll(wxVERTICAL, m_win->m_vAdjust, y_pos, m_yScrollPixelsPerLine,
 179                 &m_yScrollPosition);
 180 }
 181