src/gtk/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 #include <math.h>
  18
  19 //-----------------------------------------------------------------------------
  20 // data
  21 //-----------------------------------------------------------------------------
  22
  23 extern bool   g_blockEventsOnDrag;
  24 extern bool   g_blockEventsOnScroll;
  25
  26 //-----------------------------------------------------------------------------
  27 // "value_changed"
  28 //-----------------------------------------------------------------------------
  29
  30 static void gtk_scrollbar_callback( GtkWidget *WXUNUSED(widget), wxScrollBar *win )
  31 {
  32   if (!win->HasVMT()) return;
  33   if (g_blockEventsOnDrag) return;
  34
  35   float diff = win->m_adjust->value - win->m_oldPos;
  36   if (fabs(diff) < 0.2) return;
  37
  38   wxEventType command = wxEVT_NULL;
  39
  40   float line_step = win->m_adjust->step_increment;
  41   float page_step = win->m_adjust->page_increment;
  42
  43   if (win->m_isScrolling)
  44   {
  45       command = wxEVT_SCROLL_THUMBTRACK;
  46   }
  47   else
  48   {
  49       if (fabs(win->m_adjust->value-win->m_adjust->lower) < 0.2) command = wxEVT_SCROLL_BOTTOM;
  50       else if (fabs(win->m_adjust->value-win->m_adjust->upper) < 0.2) command = wxEVT_SCROLL_TOP;
  51       else if (fabs(diff-line_step) < 0.2) command = wxEVT_SCROLL_LINEDOWN;
  52       else if (fabs(diff+line_step) < 0.2) command = wxEVT_SCROLL_LINEUP;
  53       else if (fabs(diff-page_step) < 0.2) command = wxEVT_SCROLL_PAGEDOWN;
  54       else if (fabs(diff+page_step) < 0.2) command = wxEVT_SCROLL_PAGEUP;
  55       else command = wxEVT_SCROLL_THUMBTRACK;
  56   }
  57
  58   int value = (int)(win->m_adjust->value+0.5);
  59
  60   int orient = wxHORIZONTAL;
  61   if (win->GetWindowStyleFlag() & wxSB_VERTICAL == wxSB_VERTICAL) orient = wxVERTICAL;
  62
  63   wxScrollEvent event( command, win->GetId(), value, orient );
  64   event.SetEventObject( win );
  65   win->GetEventHandler()->ProcessEvent( event );
  66
  67 /*
  68   wxCommandEvent cevent( wxEVT_COMMAND_SCROLLBAR_UPDATED, win->GetId() );
  69   cevent.SetEventObject( win );
  70   win->ProcessEvent( cevent );
  71 */
  72 }
  73
  74 //-----------------------------------------------------------------------------
  75 // "button_press_event" from slider
  76 //-----------------------------------------------------------------------------
  77
  78 static gint gtk_scrollbar_button_press_callback( GtkRange *WXUNUSED(widget),
  79                                                  GdkEventButton *WXUNUSED(gdk_event),
  80                                                  wxScrollBar *win )
  81 {
  82   win->m_isScrolling = TRUE;
  83   g_blockEventsOnScroll = TRUE;
  84
  85   return FALSE;
  86 }
  87
  88 //-----------------------------------------------------------------------------
  89 // "button_release_event" from slider
  90 //-----------------------------------------------------------------------------
  91
  92 static gint gtk_scrollbar_button_release_callback( GtkRange *WXUNUSED(widget),
  93                                                    GdkEventButton *WXUNUSED(gdk_event),
  94                                                    wxScrollBar *win )
  95 {
  96   win->m_isScrolling = FALSE;
  97   g_blockEventsOnScroll = FALSE;
  98
  99   gtk_signal_emit_by_name( GTK_OBJECT(win->m_adjust), "value_changed" );
 100
 101   return FALSE;
 102 }
 103
 104 //-----------------------------------------------------------------------------
 105 // wxScrollBar
 106 //-----------------------------------------------------------------------------
 107
 108 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
 109
 110 wxScrollBar::~wxScrollBar(void)
 111 {
 112 }
 113
 114 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 115            const wxPoint& pos, const wxSize& size,
 116            long style, const wxValidator& validator, const wxString& name )
 117 {
 118   m_needParent = TRUE;
 119
 120   PreCreation( parent, id, pos, size, style, name );
 121
 122   SetValidator( validator );
 123
 124   m_oldPos = 0.0;
 125
 126   if (style & wxSB_VERTICAL == wxSB_VERTICAL)
 127     m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 128   else
 129     m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 130
 131   m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 132
 133   gtk_signal_connect (GTK_OBJECT (m_adjust), "value_changed",
 134                       (GtkSignalFunc) gtk_scrollbar_callback, (gpointer) this );
 135
 136   gtk_signal_connect( GTK_OBJECT(m_widget), "button_press_event",
 137           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 138
 139   gtk_signal_connect( GTK_OBJECT(m_widget), "button_release_event",
 140           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 141
 142   m_parent->AddChild( this );
 143
 144   (m_parent->m_insertCallback)( m_parent, this );
 145
 146   PostCreation();
 147
 148   SetBackgroundColour( parent->GetBackgroundColour() );
 149
 150   Show( TRUE );
 151
 152   return TRUE;
 153 }
 154
 155 int wxScrollBar::GetThumbPosition(void) const
 156 {
 157   return (int)(m_adjust->value+0.5);
 158 }
 159
 160 int wxScrollBar::GetThumbSize() const
 161 {
 162   return (int)(m_adjust->page_size+0.5);
 163 }
 164
 165 int wxScrollBar::GetPageSize() const
 166 {
 167   return (int)(m_adjust->page_increment+0.5);
 168 }
 169
 170 int wxScrollBar::GetRange() const
 171 {
 172   return (int)(m_adjust->upper+0.5);
 173 }
 174
 175 void wxScrollBar::SetThumbPosition( int viewStart )
 176 {
 177   if (m_isScrolling) return;
 178
 179   float fpos = (float)viewStart;
 180   m_oldPos = fpos;
 181   if (fabs(fpos-m_adjust->value) < 0.2) return;
 182   m_adjust->value = fpos;
 183
 184   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 185 }
 186
 187 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 188       bool WXUNUSED(refresh) )
 189 {
 190   float fpos = (float)position;
 191   float frange = (float)range;
 192   float fthumb = (float)thumbSize;
 193   float fpage = (float)pageSize;
 194
 195   if ((fabs(frange-m_adjust->upper) < 0.2) &&
 196       (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 197       (fabs(fpage-m_adjust->page_increment) < 0.2))
 198   {
 199     SetThumbPosition( position );
 200     return;
 201   }
 202
 203   m_oldPos = fpos;
 204
 205   m_adjust->lower = 0.0;
 206   m_adjust->upper = frange;
 207   m_adjust->value = fpos;
 208   m_adjust->step_increment = 1.0;
 209   m_adjust->page_increment = (float)(wxMax(fpage,0));
 210   m_adjust->page_size = fthumb;
 211
 212   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 213 }
 214
 215 // Backward compatibility
 216 int wxScrollBar::GetValue(void) const
 217 {
 218   return GetThumbPosition();
 219 }
 220
 221 void wxScrollBar::SetValue( int viewStart )
 222 {
 223   SetThumbPosition( viewStart );
 224 }
 225
 226 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 227 {
 228   int pos = (int)(m_adjust->value+0.5);
 229   int thumb = (int)(m_adjust->page_size+0.5);
 230   int page = (int)(m_adjust->page_increment+0.5);
 231   int range = (int)(m_adjust->upper+0.5);
 232
 233   *viewStart = pos;
 234   *viewLength = range;
 235   *objectLength = thumb;
 236   *pageLength = page;
 237 }
 238
 239 int wxScrollBar::GetViewLength() const
 240 {
 241   return (int)(m_adjust->upper+0.5);
 242 }
 243
 244 int wxScrollBar::GetObjectLength() const
 245 {
 246   return (int)(m_adjust->page_size+0.5);
 247 }
 248
 249 void wxScrollBar::SetPageSize( int pageLength )
 250 {
 251   int pos = (int)(m_adjust->value+0.5);
 252   int thumb = (int)(m_adjust->page_size+0.5);
 253   int range = (int)(m_adjust->upper+0.5);
 254   SetScrollbar( pos, thumb, range, pageLength );
 255 }
 256
 257 void wxScrollBar::SetObjectLength( int objectLength )
 258 {
 259   int pos = (int)(m_adjust->value+0.5);
 260   int page = (int)(m_adjust->page_increment+0.5);
 261   int range = (int)(m_adjust->upper+0.5);
 262   SetScrollbar( pos, objectLength, range, page );
 263 }
 264
 265 void wxScrollBar::SetViewLength( int viewLength )
 266 {
 267   int pos = (int)(m_adjust->value+0.5);
 268   int thumb = (int)(m_adjust->page_size+0.5);
 269   int page = (int)(m_adjust->page_increment+0.5);
 270   SetScrollbar( pos, thumb, viewLength, page );
 271 }
 272
 273 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 274 {
 275   GtkRange *range = GTK_RANGE(m_widget);
 276   return ( (window == GTK_WIDGET(range)->window) ||
 277            (window == range->trough) ||
 278            (window == range->slider) ||
 279            (window == range->step_forw) ||
 280            (window == range->step_back) );
 281 }
 282
 283 void wxScrollBar::ApplyWidgetStyle()
 284 {
 285   SetWidgetStyle();
 286   gtk_widget_set_style( m_widget, m_widgetStyle );
 287 }
 288