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