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 // "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 = wxVERTICAL;
  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 // "button_press_event" from slider
  66 //-----------------------------------------------------------------------------
  67
  68 static gint gtk_scrollbar_button_press_callback( GtkRange *widget, GdkEventButton *gdk_event, wxScrollBar *win )
  69 {
  70   if (gdk_event->window != widget->slider) return FALSE;
  71
  72   win->m_isScrolling = TRUE;
  73
  74   return FALSE;
  75 }
  76
  77 //-----------------------------------------------------------------------------
  78 // "button_release_event" from slider
  79 //-----------------------------------------------------------------------------
  80
  81 static gint gtk_scrollbar_button_release_callback( GtkRange *widget, GdkEventButton *gdk_event, wxScrollBar *win )
  82 {
  83   if (gdk_event->window != widget->slider) return FALSE;
  84
  85   gtk_signal_emit_by_name( GTK_OBJECT(win->m_adjust), "value_changed" );
  86
  87   win->m_isScrolling = FALSE;
  88
  89   return FALSE;
  90 }
  91
  92 //-----------------------------------------------------------------------------
  93 // wxScrollBar
  94 //-----------------------------------------------------------------------------
  95
  96 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
  97
  98 wxScrollBar::~wxScrollBar(void)
  99 {
 100 }
 101
 102 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 103            const wxPoint& pos, const wxSize& size,
 104            long style, const wxValidator& validator, const wxString& name )
 105 {
 106   m_needParent = TRUE;
 107
 108   PreCreation( parent, id, pos, size, style, name );
 109
 110   SetValidator( validator );
 111
 112   m_oldPos = 0.0;
 113
 114   if (style & wxSB_VERTICAL == wxSB_VERTICAL)
 115     m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 116   else
 117     m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 118
 119   m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 120
 121   gtk_signal_connect (GTK_OBJECT (m_adjust), "value_changed",
 122                       (GtkSignalFunc) gtk_scrollbar_callback, (gpointer) this );
 123
 124   gtk_signal_connect( GTK_OBJECT(m_widget), "button_press_event",
 125           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 126
 127   gtk_signal_connect( GTK_OBJECT(m_widget), "button_release_event",
 128           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 129
 130   PostCreation();
 131
 132   Show( TRUE );
 133
 134   return TRUE;
 135 }
 136
 137 int wxScrollBar::GetPosition(void) const
 138 {
 139   return (int)(m_adjust->value+0.5);
 140 }
 141
 142 int wxScrollBar::GetThumbSize() const
 143 {
 144   return (int)(m_adjust->page_size+0.5);
 145 }
 146
 147 int wxScrollBar::GetPageSize() const
 148 {
 149   return (int)(m_adjust->page_increment+0.5);
 150 }
 151
 152 int wxScrollBar::GetRange() const
 153 {
 154   return (int)(m_adjust->upper+0.5);
 155 }
 156
 157 void wxScrollBar::SetPosition( int viewStart )
 158 {
 159   float fpos = (float)viewStart;
 160   m_oldPos = fpos;
 161   if (fabs(fpos-m_adjust->value) < 0.2) return;
 162   m_adjust->value = fpos;
 163
 164   if (!m_isScrolling)
 165     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 166 }
 167
 168 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 169       bool WXUNUSED(refresh) )
 170 {
 171   float fpos = (float)position;
 172   float frange = (float)range;
 173   float fthumb = (float)thumbSize;
 174   float fpage = (float)pageSize;
 175
 176   if ((fabs(frange-m_adjust->upper) < 0.2) &&
 177       (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 178       (fabs(fpage-m_adjust->page_increment) < 0.2))
 179   {
 180     SetPosition( position );
 181     return;
 182   }
 183
 184   m_oldPos = fpos;
 185
 186   m_adjust->lower = 0.0;
 187   m_adjust->upper = frange;
 188   m_adjust->value = fpos;
 189   m_adjust->step_increment = 1.0;
 190   m_adjust->page_increment = (float)(wxMax(fpage,0));
 191   m_adjust->page_size = fthumb;
 192
 193   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 194 }
 195
 196 // Backward compatibility
 197 int wxScrollBar::GetValue(void) const
 198 {
 199   return GetPosition();
 200 }
 201
 202 void wxScrollBar::SetValue( int viewStart )
 203 {
 204   SetPosition( viewStart );
 205 }
 206
 207 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 208 {
 209   int pos = (int)(m_adjust->value+0.5);
 210   int thumb = (int)(m_adjust->page_size+0.5);
 211   int page = (int)(m_adjust->page_increment+0.5);
 212   int range = (int)(m_adjust->upper+0.5);
 213
 214   *viewStart = pos;
 215   *viewLength = range;
 216   *objectLength = thumb;
 217   *pageLength = page;
 218 }
 219
 220 int wxScrollBar::GetViewLength() const
 221 {
 222   return (int)(m_adjust->upper+0.5);
 223 }
 224
 225 int wxScrollBar::GetObjectLength() const
 226 {
 227   return (int)(m_adjust->page_size+0.5);
 228 }
 229
 230 void wxScrollBar::SetPageSize( int pageLength )
 231 {
 232   int pos = (int)(m_adjust->value+0.5);
 233   int thumb = (int)(m_adjust->page_size+0.5);
 234   int range = (int)(m_adjust->upper+0.5);
 235   SetScrollbar( pos, thumb, range, pageLength );
 236 }
 237
 238 void wxScrollBar::SetObjectLength( int objectLength )
 239 {
 240   int pos = (int)(m_adjust->value+0.5);
 241   int page = (int)(m_adjust->page_increment+0.5);
 242   int range = (int)(m_adjust->upper+0.5);
 243   SetScrollbar( pos, objectLength, range, page );
 244 }
 245
 246 void wxScrollBar::SetViewLength( int viewLength )
 247 {
 248   int pos = (int)(m_adjust->value+0.5);
 249   int thumb = (int)(m_adjust->page_size+0.5);
 250   int page = (int)(m_adjust->page_increment+0.5);
 251   SetScrollbar( pos, thumb, viewLength, page );
 252 }
 253
 254 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 255 {
 256   GtkRange *range = GTK_RANGE(m_widget);
 257   return ( (window == GTK_WIDGET(range)->window) ||
 258            (window == range->trough) ||
 259            (window == range->slider) ||
 260            (window == range->step_forw) ||
 261            (window == range->step_back) );
 262 }