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   m_parent->AddChild( this );
 130
 131   (m_parent->m_insertCallback)( m_parent, this );
 132
 133   PostCreation();
 134
 135   SetBackgroundColour( parent->GetBackgroundColour() );
 136
 137   Show( TRUE );
 138
 139   return TRUE;
 140 }
 141
 142 int wxScrollBar::GetPosition(void) const
 143 {
 144   return (int)(m_adjust->value+0.5);
 145 }
 146
 147 int wxScrollBar::GetThumbSize() const
 148 {
 149   return (int)(m_adjust->page_size+0.5);
 150 }
 151
 152 int wxScrollBar::GetPageSize() const
 153 {
 154   return (int)(m_adjust->page_increment+0.5);
 155 }
 156
 157 int wxScrollBar::GetRange() const
 158 {
 159   return (int)(m_adjust->upper+0.5);
 160 }
 161
 162 void wxScrollBar::SetPosition( int viewStart )
 163 {
 164   float fpos = (float)viewStart;
 165   m_oldPos = fpos;
 166   if (fabs(fpos-m_adjust->value) < 0.2) return;
 167   m_adjust->value = fpos;
 168
 169   if (!m_isScrolling)
 170     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 171 }
 172
 173 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 174       bool WXUNUSED(refresh) )
 175 {
 176   float fpos = (float)position;
 177   float frange = (float)range;
 178   float fthumb = (float)thumbSize;
 179   float fpage = (float)pageSize;
 180
 181   if ((fabs(frange-m_adjust->upper) < 0.2) &&
 182       (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 183       (fabs(fpage-m_adjust->page_increment) < 0.2))
 184   {
 185     SetPosition( position );
 186     return;
 187   }
 188
 189   m_oldPos = fpos;
 190
 191   m_adjust->lower = 0.0;
 192   m_adjust->upper = frange;
 193   m_adjust->value = fpos;
 194   m_adjust->step_increment = 1.0;
 195   m_adjust->page_increment = (float)(wxMax(fpage,0));
 196   m_adjust->page_size = fthumb;
 197
 198   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 199 }
 200
 201 // Backward compatibility
 202 int wxScrollBar::GetValue(void) const
 203 {
 204   return GetPosition();
 205 }
 206
 207 void wxScrollBar::SetValue( int viewStart )
 208 {
 209   SetPosition( viewStart );
 210 }
 211
 212 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 213 {
 214   int pos = (int)(m_adjust->value+0.5);
 215   int thumb = (int)(m_adjust->page_size+0.5);
 216   int page = (int)(m_adjust->page_increment+0.5);
 217   int range = (int)(m_adjust->upper+0.5);
 218
 219   *viewStart = pos;
 220   *viewLength = range;
 221   *objectLength = thumb;
 222   *pageLength = page;
 223 }
 224
 225 int wxScrollBar::GetViewLength() const
 226 {
 227   return (int)(m_adjust->upper+0.5);
 228 }
 229
 230 int wxScrollBar::GetObjectLength() const
 231 {
 232   return (int)(m_adjust->page_size+0.5);
 233 }
 234
 235 void wxScrollBar::SetPageSize( int pageLength )
 236 {
 237   int pos = (int)(m_adjust->value+0.5);
 238   int thumb = (int)(m_adjust->page_size+0.5);
 239   int range = (int)(m_adjust->upper+0.5);
 240   SetScrollbar( pos, thumb, range, pageLength );
 241 }
 242
 243 void wxScrollBar::SetObjectLength( int objectLength )
 244 {
 245   int pos = (int)(m_adjust->value+0.5);
 246   int page = (int)(m_adjust->page_increment+0.5);
 247   int range = (int)(m_adjust->upper+0.5);
 248   SetScrollbar( pos, objectLength, range, page );
 249 }
 250
 251 void wxScrollBar::SetViewLength( int viewLength )
 252 {
 253   int pos = (int)(m_adjust->value+0.5);
 254   int thumb = (int)(m_adjust->page_size+0.5);
 255   int page = (int)(m_adjust->page_increment+0.5);
 256   SetScrollbar( pos, thumb, viewLength, page );
 257 }
 258
 259 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 260 {
 261   GtkRange *range = GTK_RANGE(m_widget);
 262   return ( (window == GTK_WIDGET(range)->window) ||
 263            (window == range->trough) ||
 264            (window == range->slider) ||
 265            (window == range->step_forw) ||
 266            (window == range->step_back) );
 267 }
 268
 269 void wxScrollBar::ApplyWidgetStyle()
 270 {
 271   SetWidgetStyle();
 272   gtk_widget_set_style( m_widget, m_widgetStyle );
 273 }
 274