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 #include <math.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   m_parent->AddChild( this );
 131
 132   (m_parent->m_insertCallback)( m_parent, this );
 133
 134   PostCreation();
 135
 136   SetBackgroundColour( parent->GetBackgroundColour() );
 137
 138   Show( TRUE );
 139
 140   return TRUE;
 141 }
 142
 143 int wxScrollBar::GetPosition(void) const
 144 {
 145   return (int)(m_adjust->value+0.5);
 146 }
 147
 148 int wxScrollBar::GetThumbSize() const
 149 {
 150   return (int)(m_adjust->page_size+0.5);
 151 }
 152
 153 int wxScrollBar::GetPageSize() const
 154 {
 155   return (int)(m_adjust->page_increment+0.5);
 156 }
 157
 158 int wxScrollBar::GetRange() const
 159 {
 160   return (int)(m_adjust->upper+0.5);
 161 }
 162
 163 void wxScrollBar::SetPosition( int viewStart )
 164 {
 165   float fpos = (float)viewStart;
 166   m_oldPos = fpos;
 167   if (fabs(fpos-m_adjust->value) < 0.2) return;
 168   m_adjust->value = fpos;
 169
 170   if (!m_isScrolling)
 171     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 172 }
 173
 174 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 175       bool WXUNUSED(refresh) )
 176 {
 177   float fpos = (float)position;
 178   float frange = (float)range;
 179   float fthumb = (float)thumbSize;
 180   float fpage = (float)pageSize;
 181
 182   if ((fabs(frange-m_adjust->upper) < 0.2) &&
 183       (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 184       (fabs(fpage-m_adjust->page_increment) < 0.2))
 185   {
 186     SetPosition( position );
 187     return;
 188   }
 189
 190   m_oldPos = fpos;
 191
 192   m_adjust->lower = 0.0;
 193   m_adjust->upper = frange;
 194   m_adjust->value = fpos;
 195   m_adjust->step_increment = 1.0;
 196   m_adjust->page_increment = (float)(wxMax(fpage,0));
 197   m_adjust->page_size = fthumb;
 198
 199   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 200 }
 201
 202 // Backward compatibility
 203 int wxScrollBar::GetValue(void) const
 204 {
 205   return GetPosition();
 206 }
 207
 208 void wxScrollBar::SetValue( int viewStart )
 209 {
 210   SetPosition( viewStart );
 211 }
 212
 213 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 214 {
 215   int pos = (int)(m_adjust->value+0.5);
 216   int thumb = (int)(m_adjust->page_size+0.5);
 217   int page = (int)(m_adjust->page_increment+0.5);
 218   int range = (int)(m_adjust->upper+0.5);
 219
 220   *viewStart = pos;
 221   *viewLength = range;
 222   *objectLength = thumb;
 223   *pageLength = page;
 224 }
 225
 226 int wxScrollBar::GetViewLength() const
 227 {
 228   return (int)(m_adjust->upper+0.5);
 229 }
 230
 231 int wxScrollBar::GetObjectLength() const
 232 {
 233   return (int)(m_adjust->page_size+0.5);
 234 }
 235
 236 void wxScrollBar::SetPageSize( int pageLength )
 237 {
 238   int pos = (int)(m_adjust->value+0.5);
 239   int thumb = (int)(m_adjust->page_size+0.5);
 240   int range = (int)(m_adjust->upper+0.5);
 241   SetScrollbar( pos, thumb, range, pageLength );
 242 }
 243
 244 void wxScrollBar::SetObjectLength( int objectLength )
 245 {
 246   int pos = (int)(m_adjust->value+0.5);
 247   int page = (int)(m_adjust->page_increment+0.5);
 248   int range = (int)(m_adjust->upper+0.5);
 249   SetScrollbar( pos, objectLength, range, page );
 250 }
 251
 252 void wxScrollBar::SetViewLength( int viewLength )
 253 {
 254   int pos = (int)(m_adjust->value+0.5);
 255   int thumb = (int)(m_adjust->page_size+0.5);
 256   int page = (int)(m_adjust->page_increment+0.5);
 257   SetScrollbar( pos, thumb, viewLength, page );
 258 }
 259
 260 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 261 {
 262   GtkRange *range = GTK_RANGE(m_widget);
 263   return ( (window == GTK_WIDGET(range)->window) ||
 264            (window == range->trough) ||
 265            (window == range->slider) ||
 266            (window == range->step_forw) ||
 267            (window == range->step_back) );
 268 }
 269
 270 void wxScrollBar::ApplyWidgetStyle()
 271 {
 272   SetWidgetStyle();
 273   gtk_widget_set_style( m_widget, m_widgetStyle );
 274 }
 275