src/gtk/scrolbar.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        scrolbar.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Created:     01/02/97
   6 // Id:
   7 // Copyright:   (c) 1998 Robert Roebling, Julian Smart and Markus Holzem
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "scrolbar.h"
  14 #endif
  15
  16 #include "wx/scrolbar.h"
  17 #include "wx/utils.h"
  18
  19 //-----------------------------------------------------------------------------
  20 // data
  21 //-----------------------------------------------------------------------------
  22
  23 extern bool   g_blockEventsOnDrag;
  24
  25 //-----------------------------------------------------------------------------
  26 // wxScrollBar
  27 //-----------------------------------------------------------------------------
  28
  29 static void gtk_scrollbar_callback( GtkWidget *WXUNUSED(widget), wxScrollBar *win )
  30 {
  31   if (!win->HasVMT()) return;
  32   if (g_blockEventsOnDrag) return;
  33
  34   float diff = win->m_adjust->value - win->m_oldPos;
  35   if (fabs(diff) < 0.2) return;
  36
  37   wxEventType command = wxEVT_NULL;
  38
  39   float line_step = win->m_adjust->step_increment;
  40   float page_step = win->m_adjust->page_increment;
  41
  42   if (fabs(diff-line_step) < 0.2) command = wxEVT_SCROLL_LINEDOWN;
  43   else if (fabs(diff+line_step) < 0.2) command = wxEVT_SCROLL_LINEUP;
  44   else if (fabs(diff-page_step) < 0.2) command = wxEVT_SCROLL_PAGEDOWN;
  45   else if (fabs(diff+page_step) < 0.2) command = wxEVT_SCROLL_PAGEUP;
  46   else command = wxEVT_SCROLL_THUMBTRACK;
  47
  48   int value = (int)(win->m_adjust->value+0.5);
  49
  50   int orient = wxHORIZONTAL;
  51   if (win->GetWindowStyleFlag() & wxSB_VERTICAL == wxSB_VERTICAL) orient = wxHORIZONTAL;
  52
  53   wxScrollEvent event( command, win->GetId(), value, orient );
  54   event.SetEventObject( win );
  55   win->GetEventHandler()->ProcessEvent( event );
  56
  57 /*
  58   wxCommandEvent cevent( wxEVT_COMMAND_SCROLLBAR_UPDATED, win->GetId() );
  59   cevent.SetEventObject( win );
  60   win->ProcessEvent( cevent );
  61 */
  62 }
  63
  64 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
  65
  66 wxScrollBar::~wxScrollBar(void)
  67 {
  68 }
  69
  70 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
  71            const wxPoint& pos, const wxSize& size,
  72            long style, const wxValidator& validator, const wxString& name )
  73 {
  74   m_needParent = TRUE;
  75
  76   PreCreation( parent, id, pos, size, style, name );
  77
  78   SetValidator( validator );
  79
  80   m_oldPos = 0.0;
  81
  82   if (style & wxSB_VERTICAL == wxSB_VERTICAL)
  83     m_widget = gtk_hscrollbar_new( NULL );
  84   else
  85     m_widget = gtk_vscrollbar_new( NULL );
  86
  87   m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
  88
  89   gtk_signal_connect (GTK_OBJECT (m_adjust), "value_changed",
  90                       (GtkSignalFunc) gtk_scrollbar_callback, (gpointer) this );
  91
  92   PostCreation();
  93
  94   Show( TRUE );
  95
  96   return TRUE;
  97 }
  98
  99 int wxScrollBar::GetPosition(void) const
 100 {
 101   return (int)(m_adjust->value+0.5);
 102 }
 103
 104 int wxScrollBar::GetThumbSize() const
 105 {
 106   return (int)(m_adjust->page_size+0.5);
 107 }
 108
 109 int wxScrollBar::GetPageSize() const
 110 {
 111   return (int)(m_adjust->page_increment+0.5);
 112 }
 113
 114 int wxScrollBar::GetRange() const
 115 {
 116   return (int)(m_adjust->upper+0.5);
 117 }
 118
 119 void wxScrollBar::SetPosition( int viewStart )
 120 {
 121   float fpos = (float)viewStart;
 122   m_oldPos = fpos;
 123   if (fabs(fpos-m_adjust->value) < 0.2) return;
 124   m_adjust->value = fpos;
 125
 126   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 127 }
 128
 129 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 130       bool WXUNUSED(refresh) )
 131 {
 132   float fpos = (float)position;
 133   m_oldPos = fpos;
 134   float frange = (float)range;
 135   float fthumb = (float)thumbSize;
 136   float fpage = (float)pageSize;
 137
 138   if ((fabs(fpos-m_adjust->value) < 0.2) &&
 139       (fabs(frange-m_adjust->upper) < 0.2) &&
 140       (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 141       (fabs(fpage-m_adjust->page_increment) < 0.2))
 142       return;
 143
 144   m_adjust->lower = 0.0;
 145   m_adjust->upper = frange;
 146   m_adjust->value = fpos;
 147   m_adjust->step_increment = 1.0;
 148   m_adjust->page_increment = (float)(wxMax(fpage-2,0));
 149   m_adjust->page_size = fthumb;
 150
 151   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 152 }
 153
 154 // Backward compatibility
 155 int wxScrollBar::GetValue(void) const
 156 {
 157   return GetPosition();
 158 }
 159
 160 void wxScrollBar::SetValue( int viewStart )
 161 {
 162   SetPosition( viewStart );
 163 }
 164
 165 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 166 {
 167   int pos = (int)(m_adjust->value+0.5);
 168   int thumb = (int)(m_adjust->page_size+0.5);
 169   int page = (int)(m_adjust->page_increment+0.5);
 170   int range = (int)(m_adjust->upper+0.5);
 171
 172   *viewStart = pos;
 173   *viewLength = range;
 174   *objectLength = thumb;
 175   *pageLength = page;
 176 }
 177
 178 int wxScrollBar::GetViewLength() const
 179 {
 180   return (int)(m_adjust->upper+0.5);
 181 }
 182
 183 int wxScrollBar::GetObjectLength() const
 184 {
 185   return (int)(m_adjust->page_size+0.5);
 186 }
 187
 188 void wxScrollBar::SetPageSize( int pageLength )
 189 {
 190   int pos = (int)(m_adjust->value+0.5);
 191   int thumb = (int)(m_adjust->page_size+0.5);
 192   int range = (int)(m_adjust->upper+0.5);
 193   SetScrollbar( pos, thumb, range, pageLength );
 194 }
 195
 196 void wxScrollBar::SetObjectLength( int objectLength )
 197 {
 198   int pos = (int)(m_adjust->value+0.5);
 199   int page = (int)(m_adjust->page_increment+0.5);
 200   int range = (int)(m_adjust->upper+0.5);
 201   SetScrollbar( pos, objectLength, range, page );
 202 }
 203
 204 void wxScrollBar::SetViewLength( int viewLength )
 205 {
 206   int pos = (int)(m_adjust->value+0.5);
 207   int thumb = (int)(m_adjust->page_size+0.5);
 208   int page = (int)(m_adjust->page_increment+0.5);
 209   SetScrollbar( pos, thumb, viewLength, page );
 210 }
 211