src/gtk1/scrolwin.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk1/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 // Copyright:   (c) Robert Roebling
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // For compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #include "wx/scrolwin.h"
  28 #include "wx/gtk1/private.h"
  29
  30 // ============================================================================
  31 // implementation
  32 // ============================================================================
  33
  34 // ----------------------------------------------------------------------------
  35 // wxScrollHelper implementation
  36 // ----------------------------------------------------------------------------
  37
  38 void wxScrollHelper::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
  39                                          int noUnitsX, int noUnitsY,
  40                                          int xPos, int yPos,
  41                                          bool noRefresh)
  42 {
  43     int xs, ys;
  44     GetViewStart(& xs, & ys);
  45
  46     int old_x = m_xScrollPixelsPerLine * xs;
  47     int old_y = m_yScrollPixelsPerLine * ys;
  48
  49     m_xScrollPixelsPerLine = pixelsPerUnitX;
  50     m_yScrollPixelsPerLine = pixelsPerUnitY;
  51
  52     m_win->m_hAdjust->value = m_xScrollPosition = xPos;
  53     m_win->m_vAdjust->value = m_yScrollPosition = yPos;
  54
  55     // Setting hints here should arguably be deprecated, but without it
  56     // a sizer might override this manual scrollbar setting in old code.
  57     // m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
  58
  59     int w = noUnitsX * pixelsPerUnitX;
  60     int h = noUnitsY * pixelsPerUnitY;
  61     m_targetWindow->SetVirtualSize( w ? w : wxDefaultCoord,
  62                                     h ? h : wxDefaultCoord);
  63
  64     if (!noRefresh)
  65     {
  66         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
  67         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
  68
  69         m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
  70     }
  71
  72     m_targetWindow->m_hasScrolling = pixelsPerUnitX || pixelsPerUnitY;
  73 }
  74
  75 void wxScrollHelper::DoAdjustScrollbar(GtkAdjustment *adj,
  76                                              int pixelsPerLine,
  77                                              int winSize,
  78                                              int virtSize,
  79                                              int *pos,
  80                                              int *lines,
  81                                              int *linesPerPage)
  82 {
  83     if ( pixelsPerLine == 0 )
  84     {
  85         adj->upper = 1.0;
  86         adj->page_increment = 1.0;
  87         adj->page_size = 1.0;
  88     }
  89     else // we do have scrollbar
  90     {
  91         adj->upper = (virtSize + pixelsPerLine - 1) / pixelsPerLine;
  92         adj->page_size = winSize / pixelsPerLine;
  93         adj->page_increment = winSize / pixelsPerLine;
  94
  95         // Special case. When client and virtual size are very close but
  96         // the client is big enough, kill scrollbar.
  97
  98         if ((adj->page_size < adj->upper) && (winSize >= virtSize))
  99             adj->page_size += 1.0;
 100
 101         // If the scrollbar hits the right side, move the window
 102         // right to keep it from over extending.
 103
 104         if ( !wxIsNullDouble(adj->value) &&
 105                 (adj->value + adj->page_size > adj->upper) )
 106         {
 107             adj->value = adj->upper - adj->page_size;
 108             if (adj->value < 0.0)
 109                 adj->value = 0.0;
 110
 111             if ( m_win->GetChildren().empty() )
 112             {
 113                 // This is enough without child windows
 114                 *pos = (int)adj->value;
 115             }
 116             else
 117             {
 118                 // We need to actually scroll window
 119                 gtk_signal_emit_by_name( GTK_OBJECT(adj), "value_changed" );
 120             }
 121         }
 122     }
 123
 124     *lines = (int)(adj->upper + 0.5);
 125     *linesPerPage = (int)(adj->page_increment + 0.5);
 126     gtk_signal_emit_by_name( GTK_OBJECT(adj), "changed" );
 127 }
 128
 129 void wxScrollHelper::AdjustScrollbars()
 130 {
 131     int w, h;
 132     int vw, vh;
 133
 134     m_targetWindow->GetClientSize( &w, &h );
 135     m_targetWindow->GetVirtualSize( &vw, &vh );
 136
 137     DoAdjustScrollbar(m_win->m_hAdjust, m_xScrollPixelsPerLine, w, vw,
 138                       &m_xScrollPosition, &m_xScrollLines, &m_xScrollLinesPerPage);
 139     DoAdjustScrollbar(m_win->m_vAdjust, m_yScrollPixelsPerLine, h, vh,
 140                       &m_yScrollPosition, &m_yScrollLines, &m_yScrollLinesPerPage);
 141 }
 142
 143 void wxScrollHelper::DoScrollOneDir(int orient,
 144                                     GtkAdjustment *adj,
 145                                     int pos,
 146                                     int pixelsPerLine,
 147                                     int *posOld)
 148 {
 149     if ( pos != -1 && pos != *posOld && pixelsPerLine )
 150     {
 151         int max = (int)(adj->upper - adj->page_size + 0.5);
 152         if (max < 0)
 153             max = 0;
 154         if (pos > max)
 155             pos = max;
 156         if (pos < 0)
 157             pos = 0;
 158
 159         adj->value = pos;
 160
 161         int diff = (*posOld - pos)*pixelsPerLine;
 162         m_targetWindow->ScrollWindow(orient == wxHORIZONTAL ? diff : 0,
 163                                      orient == wxHORIZONTAL ? 0 : diff);
 164
 165         *posOld = pos;
 166
 167         m_win->GtkUpdateScrollbar(orient);
 168     }
 169 }
 170
 171 void wxScrollHelper::DoScroll( int x_pos, int y_pos )
 172 {
 173     wxCHECK_RET( m_targetWindow != 0, wxT("No target window") );
 174
 175     DoScrollOneDir(wxHORIZONTAL, m_win->m_hAdjust, x_pos, m_xScrollPixelsPerLine,
 176                 &m_xScrollPosition);
 177     DoScrollOneDir(wxVERTICAL, m_win->m_vAdjust, y_pos, m_yScrollPixelsPerLine,
 178                 &m_yScrollPosition);
 179 }
 180
 181 void wxScrollHelper::DoShowScrollbars(wxScrollbarVisibility WXUNUSED(horz),
 182                                       wxScrollbarVisibility WXUNUSED(vert))
 183 {
 184     // TODO: not supported/implemented
 185 }
 186