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(wxWindow *parent, wxWindowID id,
  67            const wxPoint& pos, const wxSize& size,
  68            long style, const wxString& name )
  69 {
  70   Create( parent, id, pos, size, style, name );
  71 };
  72
  73 wxScrollBar::~wxScrollBar(void)
  74 {
  75 };
  76
  77 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
  78            const wxPoint& pos, const wxSize& size,
  79            long style, const wxString& name )
  80 {
  81   m_needParent = TRUE;
  82
  83   PreCreation( parent, id, pos, size, style, name );
  84
  85   m_oldPos = 0.0;
  86
  87   if (style & wxSB_VERTICAL == wxSB_VERTICAL)
  88     m_widget = gtk_hscrollbar_new( NULL );
  89   else
  90     m_widget = gtk_vscrollbar_new( NULL );
  91
  92   m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
  93
  94   gtk_signal_connect (GTK_OBJECT (m_adjust), "value_changed",
  95                       (GtkSignalFunc) gtk_scrollbar_callback, (gpointer) this );
  96
  97   PostCreation();
  98
  99   Show( TRUE );
 100
 101   return TRUE;
 102 };
 103
 104 int wxScrollBar::GetPosition(void) const
 105 {
 106   return (int)(m_adjust->value+0.5);
 107 };
 108
 109 int wxScrollBar::GetThumbSize() const
 110 {
 111   return (int)(m_adjust->page_size+0.5);
 112 };
 113
 114 int wxScrollBar::GetPageSize() const
 115 {
 116   return (int)(m_adjust->page_increment+0.5);
 117 };
 118
 119 int wxScrollBar::GetRange() const
 120 {
 121   return (int)(m_adjust->upper+0.5);
 122 };
 123
 124 void wxScrollBar::SetPosition( int viewStart )
 125 {
 126   float fpos = (float)viewStart;
 127   m_oldPos = fpos;
 128   if (fabs(fpos-m_adjust->value) < 0.2) return;
 129   m_adjust->value = fpos;
 130
 131   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 132 };
 133
 134 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 135       bool WXUNUSED(refresh) )
 136 {
 137   float fpos = (float)position;
 138   m_oldPos = fpos;
 139   float frange = (float)range;
 140   float fthumb = (float)thumbSize;
 141   float fpage = (float)pageSize;
 142
 143   if ((fabs(fpos-m_adjust->value) < 0.2) &&
 144       (fabs(frange-m_adjust->upper) < 0.2) &&
 145       (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 146       (fabs(fpage-m_adjust->page_increment) < 0.2))
 147       return;
 148
 149   m_adjust->lower = 0.0;
 150   m_adjust->upper = frange;
 151   m_adjust->value = fpos;
 152   m_adjust->step_increment = 1.0;
 153   m_adjust->page_increment = (float)(wxMax(fpage-2,0));
 154   m_adjust->page_size = fthumb;
 155
 156   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 157 };
 158
 159 // Backward compatibility
 160 int wxScrollBar::GetValue(void) const
 161 {
 162   return GetPosition();
 163 };
 164
 165 void wxScrollBar::SetValue( int viewStart )
 166 {
 167   SetPosition( viewStart );
 168 };
 169
 170 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 171 {
 172   int pos = (int)(m_adjust->value+0.5);
 173   int thumb = (int)(m_adjust->page_size+0.5);
 174   int page = (int)(m_adjust->page_increment+0.5);
 175   int range = (int)(m_adjust->upper+0.5);
 176
 177   *viewStart = pos;
 178   *viewLength = range;
 179   *objectLength = thumb;
 180   *pageLength = page;
 181 };
 182
 183 int wxScrollBar::GetViewLength() const
 184 {
 185   return (int)(m_adjust->upper+0.5);
 186 };
 187
 188 int wxScrollBar::GetObjectLength() const
 189 {
 190   return (int)(m_adjust->page_size+0.5);
 191 };
 192
 193 void wxScrollBar::SetPageSize( int pageLength )
 194 {
 195   int pos = (int)(m_adjust->value+0.5);
 196   int thumb = (int)(m_adjust->page_size+0.5);
 197   int range = (int)(m_adjust->upper+0.5);
 198   SetScrollbar( pos, thumb, range, pageLength );
 199 };
 200
 201 void wxScrollBar::SetObjectLength( int objectLength )
 202 {
 203   int pos = (int)(m_adjust->value+0.5);
 204   int page = (int)(m_adjust->page_increment+0.5);
 205   int range = (int)(m_adjust->upper+0.5);
 206   SetScrollbar( pos, objectLength, range, page );
 207 };
 208
 209 void wxScrollBar::SetViewLength( int viewLength )
 210 {
 211   int pos = (int)(m_adjust->value+0.5);
 212   int thumb = (int)(m_adjust->page_size+0.5);
 213   int page = (int)(m_adjust->page_increment+0.5);
 214   SetScrollbar( pos, thumb, viewLength, page );
 215 };
 216