src/gtk1/scrolbar.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        scrolbar.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #ifdef __GNUG__
  12 #pragma implementation "scrolbar.h"
  13 #endif
  14
  15 #include "wx/scrolbar.h"
  16 #include "wx/utils.h"
  17
  18 //-----------------------------------------------------------------------------
  19 // data
  20 //-----------------------------------------------------------------------------
  21
  22 extern bool   g_blockEventsOnDrag;
  23
  24 //-----------------------------------------------------------------------------
  25 // "value_changed"
  26 //-----------------------------------------------------------------------------
  27
  28 static void gtk_scrollbar_callback( GtkWidget *WXUNUSED(widget), wxScrollBar *win )
  29 {
  30   if (!win->HasVMT()) return;
  31   if (g_blockEventsOnDrag) return;
  32
  33   float diff = win->m_adjust->value - win->m_oldPos;
  34   if (fabs(diff) < 0.2) return;
  35
  36   wxEventType command = wxEVT_NULL;
  37
  38   float line_step = win->m_adjust->step_increment;
  39   float page_step = win->m_adjust->page_increment;
  40
  41   if (fabs(diff-line_step) < 0.2) command = wxEVT_SCROLL_LINEDOWN;
  42   else if (fabs(diff+line_step) < 0.2) command = wxEVT_SCROLL_LINEUP;
  43   else if (fabs(diff-page_step) < 0.2) command = wxEVT_SCROLL_PAGEDOWN;
  44   else if (fabs(diff+page_step) < 0.2) command = wxEVT_SCROLL_PAGEUP;
  45   else command = wxEVT_SCROLL_THUMBTRACK;
  46
  47   int value = (int)(win->m_adjust->value+0.5);
  48
  49   int orient = wxHORIZONTAL;
  50   if (win->GetWindowStyleFlag() & wxSB_VERTICAL == wxSB_VERTICAL) orient = wxVERTICAL;
  51
  52   wxScrollEvent event( command, win->GetId(), value, orient );
  53   event.SetEventObject( win );
  54   win->GetEventHandler()->ProcessEvent( event );
  55
  56 /*
  57   wxCommandEvent cevent( wxEVT_COMMAND_SCROLLBAR_UPDATED, win->GetId() );
  58   cevent.SetEventObject( win );
  59   win->ProcessEvent( cevent );
  60 */
  61 }
  62
  63 //-----------------------------------------------------------------------------
  64 // "button_press_event" from slider
  65 //-----------------------------------------------------------------------------
  66
  67 static gint gtk_scrollbar_button_press_callback( GtkRange *widget, GdkEventButton *gdk_event, wxScrollBar *win )
  68 {
  69   if (gdk_event->window != widget->slider) return FALSE;
  70
  71   win->m_isScrolling = TRUE;
  72
  73   return FALSE;
  74 }
  75
  76 //-----------------------------------------------------------------------------
  77 // "button_release_event" from slider
  78 //-----------------------------------------------------------------------------
  79
  80 static gint gtk_scrollbar_button_release_callback( GtkRange *widget, GdkEventButton *gdk_event, wxScrollBar *win )
  81 {
  82   if (gdk_event->window != widget->slider) return FALSE;
  83
  84   gtk_signal_emit_by_name( GTK_OBJECT(win->m_adjust), "value_changed" );
  85
  86   win->m_isScrolling = FALSE;
  87
  88   return FALSE;
  89 }
  90
  91 //-----------------------------------------------------------------------------
  92 // wxScrollBar
  93 //-----------------------------------------------------------------------------
  94
  95 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
  96
  97 wxScrollBar::~wxScrollBar(void)
  98 {
  99 }
 100
 101 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 102            const wxPoint& pos, const wxSize& size,
 103            long style, const wxValidator& validator, const wxString& name )
 104 {
 105   m_needParent = TRUE;
 106
 107   PreCreation( parent, id, pos, size, style, name );
 108
 109   SetValidator( validator );
 110
 111   m_oldPos = 0.0;
 112
 113   if (style & wxSB_VERTICAL == wxSB_VERTICAL)
 114     m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 115   else
 116     m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 117
 118   m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 119
 120   gtk_signal_connect (GTK_OBJECT (m_adjust), "value_changed",
 121                       (GtkSignalFunc) gtk_scrollbar_callback, (gpointer) this );
 122
 123   gtk_signal_connect( GTK_OBJECT(m_widget), "button_press_event",
 124           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 125
 126   gtk_signal_connect( GTK_OBJECT(m_widget), "button_release_event",
 127           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 128
 129   PostCreation();
 130
 131   SetBackgroundColour( parent->GetBackgroundColour() );
 132
 133   Show( TRUE );
 134
 135   return TRUE;
 136 }
 137
 138 int wxScrollBar::GetPosition(void) const
 139 {
 140   return (int)(m_adjust->value+0.5);
 141 }
 142
 143 int wxScrollBar::GetThumbSize() const
 144 {
 145   return (int)(m_adjust->page_size+0.5);
 146 }
 147
 148 int wxScrollBar::GetPageSize() const
 149 {
 150   return (int)(m_adjust->page_increment+0.5);
 151 }
 152
 153 int wxScrollBar::GetRange() const
 154 {
 155   return (int)(m_adjust->upper+0.5);
 156 }
 157
 158 void wxScrollBar::SetPosition( int viewStart )
 159 {
 160   float fpos = (float)viewStart;
 161   m_oldPos = fpos;
 162   if (fabs(fpos-m_adjust->value) < 0.2) return;
 163   m_adjust->value = fpos;
 164
 165   if (!m_isScrolling)
 166     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 167 }
 168
 169 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 170       bool WXUNUSED(refresh) )
 171 {
 172   float fpos = (float)position;
 173   float frange = (float)range;
 174   float fthumb = (float)thumbSize;
 175   float fpage = (float)pageSize;
 176
 177   if ((fabs(frange-m_adjust->upper) < 0.2) &&
 178       (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 179       (fabs(fpage-m_adjust->page_increment) < 0.2))
 180   {
 181     SetPosition( position );
 182     return;
 183   }
 184
 185   m_oldPos = fpos;
 186
 187   m_adjust->lower = 0.0;
 188   m_adjust->upper = frange;
 189   m_adjust->value = fpos;
 190   m_adjust->step_increment = 1.0;
 191   m_adjust->page_increment = (float)(wxMax(fpage,0));
 192   m_adjust->page_size = fthumb;
 193
 194   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 195 }
 196
 197 // Backward compatibility
 198 int wxScrollBar::GetValue(void) const
 199 {
 200   return GetPosition();
 201 }
 202
 203 void wxScrollBar::SetValue( int viewStart )
 204 {
 205   SetPosition( viewStart );
 206 }
 207
 208 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 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   int range = (int)(m_adjust->upper+0.5);
 214
 215   *viewStart = pos;
 216   *viewLength = range;
 217   *objectLength = thumb;
 218   *pageLength = page;
 219 }
 220
 221 int wxScrollBar::GetViewLength() const
 222 {
 223   return (int)(m_adjust->upper+0.5);
 224 }
 225
 226 int wxScrollBar::GetObjectLength() const
 227 {
 228   return (int)(m_adjust->page_size+0.5);
 229 }
 230
 231 void wxScrollBar::SetPageSize( int pageLength )
 232 {
 233   int pos = (int)(m_adjust->value+0.5);
 234   int thumb = (int)(m_adjust->page_size+0.5);
 235   int range = (int)(m_adjust->upper+0.5);
 236   SetScrollbar( pos, thumb, range, pageLength );
 237 }
 238
 239 void wxScrollBar::SetObjectLength( int objectLength )
 240 {
 241   int pos = (int)(m_adjust->value+0.5);
 242   int page = (int)(m_adjust->page_increment+0.5);
 243   int range = (int)(m_adjust->upper+0.5);
 244   SetScrollbar( pos, objectLength, range, page );
 245 }
 246
 247 void wxScrollBar::SetViewLength( int viewLength )
 248 {
 249   int pos = (int)(m_adjust->value+0.5);
 250   int thumb = (int)(m_adjust->page_size+0.5);
 251   int page = (int)(m_adjust->page_increment+0.5);
 252   SetScrollbar( pos, thumb, viewLength, page );
 253 }
 254
 255 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 256 {
 257   GtkRange *range = GTK_RANGE(m_widget);
 258   return ( (window == GTK_WIDGET(range)->window) ||
 259            (window == range->trough) ||
 260            (window == range->slider) ||
 261            (window == range->step_forw) ||
 262            (window == range->step_back) );
 263 }
 264
 265 void wxScrollBar::ApplyWidgetStyle()
 266 {
 267   SetWidgetStyle();
 268   gtk_widget_set_style( m_widget, m_widgetStyle );
 269 }
 270