src/gtk1/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 // "value_changed"
  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 //-----------------------------------------------------------------------------
  65 // wxScrollBar
  66 //-----------------------------------------------------------------------------
  67
  68 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
  69
  70 wxScrollBar::~wxScrollBar(void)
  71 {
  72 }
  73
  74 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
  75            const wxPoint& pos, const wxSize& size,
  76            long style, const wxValidator& validator, const wxString& name )
  77 {
  78   m_needParent = TRUE;
  79
  80   PreCreation( parent, id, pos, size, style, name );
  81
  82   SetValidator( validator );
  83
  84   m_oldPos = 0.0;
  85
  86   if (style & wxSB_VERTICAL == wxSB_VERTICAL)
  87     m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
  88   else
  89     m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
  90
  91   m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
  92
  93   gtk_signal_connect (GTK_OBJECT (m_adjust), "value_changed",
  94                       (GtkSignalFunc) gtk_scrollbar_callback, (gpointer) this );
  95
  96   PostCreation();
  97
  98   Show( TRUE );
  99
 100   return TRUE;
 101 }
 102
 103 int wxScrollBar::GetPosition(void) const
 104 {
 105   return (int)(m_adjust->value+0.5);
 106 }
 107
 108 int wxScrollBar::GetThumbSize() const
 109 {
 110   return (int)(m_adjust->page_size+0.5);
 111 }
 112
 113 int wxScrollBar::GetPageSize() const
 114 {
 115   return (int)(m_adjust->page_increment+0.5);
 116 }
 117
 118 int wxScrollBar::GetRange() const
 119 {
 120   return (int)(m_adjust->upper+0.5);
 121 }
 122
 123 void wxScrollBar::SetPosition( int viewStart )
 124 {
 125   float fpos = (float)viewStart;
 126   m_oldPos = fpos;
 127   if (fabs(fpos-m_adjust->value) < 0.2) return;
 128   m_adjust->value = fpos;
 129
 130   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 131 }
 132
 133 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 134       bool WXUNUSED(refresh) )
 135 {
 136   float fpos = (float)position;
 137   m_oldPos = fpos;
 138   float frange = (float)range;
 139   float fthumb = (float)thumbSize;
 140   float fpage = (float)pageSize;
 141
 142   if ((fabs(fpos-m_adjust->value) < 0.2) &&
 143       (fabs(frange-m_adjust->upper) < 0.2) &&
 144       (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 145       (fabs(fpage-m_adjust->page_increment) < 0.2))
 146       return;
 147
 148   m_adjust->lower = 0.0;
 149   m_adjust->upper = frange;
 150   m_adjust->value = fpos;
 151   m_adjust->step_increment = 1.0;
 152   m_adjust->page_increment = (float)(wxMax(fpage-2,0));
 153   m_adjust->page_size = fthumb;
 154
 155   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 156 }
 157
 158 // Backward compatibility
 159 int wxScrollBar::GetValue(void) const
 160 {
 161   return GetPosition();
 162 }
 163
 164 void wxScrollBar::SetValue( int viewStart )
 165 {
 166   SetPosition( viewStart );
 167 }
 168
 169 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 170 {
 171   int pos = (int)(m_adjust->value+0.5);
 172   int thumb = (int)(m_adjust->page_size+0.5);
 173   int page = (int)(m_adjust->page_increment+0.5);
 174   int range = (int)(m_adjust->upper+0.5);
 175
 176   *viewStart = pos;
 177   *viewLength = range;
 178   *objectLength = thumb;
 179   *pageLength = page;
 180 }
 181
 182 int wxScrollBar::GetViewLength() const
 183 {
 184   return (int)(m_adjust->upper+0.5);
 185 }
 186
 187 int wxScrollBar::GetObjectLength() const
 188 {
 189   return (int)(m_adjust->page_size+0.5);
 190 }
 191
 192 void wxScrollBar::SetPageSize( int pageLength )
 193 {
 194   int pos = (int)(m_adjust->value+0.5);
 195   int thumb = (int)(m_adjust->page_size+0.5);
 196   int range = (int)(m_adjust->upper+0.5);
 197   SetScrollbar( pos, thumb, range, pageLength );
 198 }
 199
 200 void wxScrollBar::SetObjectLength( int objectLength )
 201 {
 202   int pos = (int)(m_adjust->value+0.5);
 203   int page = (int)(m_adjust->page_increment+0.5);
 204   int range = (int)(m_adjust->upper+0.5);
 205   SetScrollbar( pos, objectLength, range, page );
 206 }
 207
 208 void wxScrollBar::SetViewLength( int viewLength )
 209 {
 210   int pos = (int)(m_adjust->value+0.5);
 211   int thumb = (int)(m_adjust->page_size+0.5);
 212   int page = (int)(m_adjust->page_increment+0.5);
 213   SetScrollbar( pos, thumb, viewLength, page );
 214 }
 215
 216 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 217 {
 218   GtkRange *range = GTK_RANGE(m_widget);
 219   return ( (window == GTK_WIDGET(range)->window) ||
 220            (window == range->trough) ||
 221            (window == range->slider) ||
 222            (window == range->step_forw) ||
 223            (window == range->step_back) );
 224 }