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 #include "gdk/gdk.h"
  20 #include "gtk/gtk.h"
  21
  22 //-----------------------------------------------------------------------------
  23 // data
  24 //-----------------------------------------------------------------------------
  25
  26 extern bool   g_blockEventsOnDrag;
  27 extern bool   g_blockEventsOnScroll;
  28
  29 //-----------------------------------------------------------------------------
  30 // "value_changed"
  31 //-----------------------------------------------------------------------------
  32
  33 static void gtk_scrollbar_callback( GtkWidget *WXUNUSED(widget), wxScrollBar *win )
  34 {
  35   if (!win->HasVMT()) return;
  36   if (g_blockEventsOnDrag) return;
  37
  38   float diff = win->m_adjust->value - win->m_oldPos;
  39   if (fabs(diff) < 0.2) return;
  40
  41   wxEventType command = wxEVT_NULL;
  42
  43   float line_step = win->m_adjust->step_increment;
  44   float page_step = win->m_adjust->page_increment;
  45
  46   if (win->m_isScrolling)
  47   {
  48       command = wxEVT_SCROLL_THUMBTRACK;
  49   }
  50   else
  51   {
  52       if (fabs(win->m_adjust->value-win->m_adjust->lower) < 0.2) command = wxEVT_SCROLL_BOTTOM;
  53       else if (fabs(win->m_adjust->value-win->m_adjust->upper) < 0.2) command = wxEVT_SCROLL_TOP;
  54       else if (fabs(diff-line_step) < 0.2) command = wxEVT_SCROLL_LINEDOWN;
  55       else if (fabs(diff+line_step) < 0.2) command = wxEVT_SCROLL_LINEUP;
  56       else if (fabs(diff-page_step) < 0.2) command = wxEVT_SCROLL_PAGEDOWN;
  57       else if (fabs(diff+page_step) < 0.2) command = wxEVT_SCROLL_PAGEUP;
  58       else command = wxEVT_SCROLL_THUMBTRACK;
  59   }
  60
  61   int value = (int)(win->m_adjust->value+0.5);
  62
  63   int orient = wxHORIZONTAL;
  64   if (win->GetWindowStyleFlag() & wxSB_VERTICAL == wxSB_VERTICAL) orient = wxVERTICAL;
  65
  66   wxScrollEvent event( command, win->GetId(), value, orient );
  67   event.SetEventObject( win );
  68   win->GetEventHandler()->ProcessEvent( event );
  69
  70 /*
  71   wxCommandEvent cevent( wxEVT_COMMAND_SCROLLBAR_UPDATED, win->GetId() );
  72   cevent.SetEventObject( win );
  73   win->ProcessEvent( cevent );
  74 */
  75 }
  76
  77 //-----------------------------------------------------------------------------
  78 // "button_press_event" from slider
  79 //-----------------------------------------------------------------------------
  80
  81 static gint gtk_scrollbar_button_press_callback( GtkRange *WXUNUSED(widget),
  82                                                  GdkEventButton *WXUNUSED(gdk_event),
  83                                                  wxScrollBar *win )
  84 {
  85   win->m_isScrolling = TRUE;
  86 //  g_blockEventsOnScroll = TRUE;  doesn't work in DialogEd
  87
  88   return FALSE;
  89 }
  90
  91 //-----------------------------------------------------------------------------
  92 // "button_release_event" from slider
  93 //-----------------------------------------------------------------------------
  94
  95 static gint gtk_scrollbar_button_release_callback( GtkRange *WXUNUSED(widget),
  96                                                    GdkEventButton *WXUNUSED(gdk_event),
  97                                                    wxScrollBar *win )
  98 {
  99   win->m_isScrolling = FALSE;
 100 //  g_blockEventsOnScroll = FALSE;
 101
 102   gtk_signal_emit_by_name( GTK_OBJECT(win->m_adjust), "value_changed" );
 103
 104   return FALSE;
 105 }
 106
 107 //-----------------------------------------------------------------------------
 108 // wxScrollBar
 109 //-----------------------------------------------------------------------------
 110
 111 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
 112
 113 wxScrollBar::~wxScrollBar(void)
 114 {
 115 }
 116
 117 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 118            const wxPoint& pos, const wxSize& size,
 119            long style, const wxValidator& validator, const wxString& name )
 120 {
 121   m_needParent = TRUE;
 122   m_acceptsFocus = TRUE;
 123
 124   PreCreation( parent, id, pos, size, style, name );
 125
 126   SetValidator( validator );
 127
 128   m_oldPos = 0.0;
 129
 130   if (style & wxSB_VERTICAL == wxSB_VERTICAL)
 131     m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 132   else
 133     m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 134
 135   m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 136
 137   gtk_signal_connect (GTK_OBJECT (m_adjust), "value_changed",
 138                       (GtkSignalFunc) gtk_scrollbar_callback, (gpointer) this );
 139
 140   gtk_signal_connect( GTK_OBJECT(m_widget), "button_press_event",
 141           (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
 142
 143   gtk_signal_connect( GTK_OBJECT(m_widget), "button_release_event",
 144           (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
 145
 146   m_parent->AddChild( this );
 147
 148   (m_parent->m_insertCallback)( m_parent, this );
 149
 150   PostCreation();
 151
 152   SetBackgroundColour( parent->GetBackgroundColour() );
 153
 154   Show( TRUE );
 155
 156   return TRUE;
 157 }
 158
 159 int wxScrollBar::GetThumbPosition(void) const
 160 {
 161   return (int)(m_adjust->value+0.5);
 162 }
 163
 164 int wxScrollBar::GetThumbSize() const
 165 {
 166   return (int)(m_adjust->page_size+0.5);
 167 }
 168
 169 int wxScrollBar::GetPageSize() const
 170 {
 171   return (int)(m_adjust->page_increment+0.5);
 172 }
 173
 174 int wxScrollBar::GetRange() const
 175 {
 176   return (int)(m_adjust->upper+0.5);
 177 }
 178
 179 void wxScrollBar::SetThumbPosition( int viewStart )
 180 {
 181   if (m_isScrolling) return;
 182
 183   float fpos = (float)viewStart;
 184   m_oldPos = fpos;
 185   if (fabs(fpos-m_adjust->value) < 0.2) return;
 186   m_adjust->value = fpos;
 187
 188   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 189 }
 190
 191 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 192       bool WXUNUSED(refresh) )
 193 {
 194   float fpos = (float)position;
 195   float frange = (float)range;
 196   float fthumb = (float)thumbSize;
 197   float fpage = (float)pageSize;
 198
 199   if ((fabs(frange-m_adjust->upper) < 0.2) &&
 200       (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 201       (fabs(fpage-m_adjust->page_increment) < 0.2))
 202   {
 203     SetThumbPosition( position );
 204     return;
 205   }
 206
 207   m_oldPos = fpos;
 208
 209   m_adjust->lower = 0.0;
 210   m_adjust->upper = frange;
 211   m_adjust->value = fpos;
 212   m_adjust->step_increment = 1.0;
 213   m_adjust->page_increment = (float)(wxMax(fpage,0));
 214   m_adjust->page_size = fthumb;
 215
 216   gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 217 }
 218
 219 // Backward compatibility
 220 int wxScrollBar::GetValue(void) const
 221 {
 222   return GetThumbPosition();
 223 }
 224
 225 void wxScrollBar::SetValue( int viewStart )
 226 {
 227   SetThumbPosition( viewStart );
 228 }
 229
 230 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 231 {
 232   int pos = (int)(m_adjust->value+0.5);
 233   int thumb = (int)(m_adjust->page_size+0.5);
 234   int page = (int)(m_adjust->page_increment+0.5);
 235   int range = (int)(m_adjust->upper+0.5);
 236
 237   *viewStart = pos;
 238   *viewLength = range;
 239   *objectLength = thumb;
 240   *pageLength = page;
 241 }
 242
 243 int wxScrollBar::GetViewLength() const
 244 {
 245   return (int)(m_adjust->upper+0.5);
 246 }
 247
 248 int wxScrollBar::GetObjectLength() const
 249 {
 250   return (int)(m_adjust->page_size+0.5);
 251 }
 252
 253 void wxScrollBar::SetPageSize( int pageLength )
 254 {
 255   int pos = (int)(m_adjust->value+0.5);
 256   int thumb = (int)(m_adjust->page_size+0.5);
 257   int range = (int)(m_adjust->upper+0.5);
 258   SetScrollbar( pos, thumb, range, pageLength );
 259 }
 260
 261 void wxScrollBar::SetObjectLength( int objectLength )
 262 {
 263   int pos = (int)(m_adjust->value+0.5);
 264   int page = (int)(m_adjust->page_increment+0.5);
 265   int range = (int)(m_adjust->upper+0.5);
 266   SetScrollbar( pos, objectLength, range, page );
 267 }
 268
 269 void wxScrollBar::SetViewLength( int viewLength )
 270 {
 271   int pos = (int)(m_adjust->value+0.5);
 272   int thumb = (int)(m_adjust->page_size+0.5);
 273   int page = (int)(m_adjust->page_increment+0.5);
 274   SetScrollbar( pos, thumb, viewLength, page );
 275 }
 276
 277 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 278 {
 279   GtkRange *range = GTK_RANGE(m_widget);
 280   return ( (window == GTK_WIDGET(range)->window) ||
 281            (window == range->trough) ||
 282            (window == range->slider) ||
 283            (window == range->step_forw) ||
 284            (window == range->step_back) );
 285 }
 286
 287 void wxScrollBar::ApplyWidgetStyle()
 288 {
 289   SetWidgetStyle();
 290   gtk_widget_set_style( m_widget, m_widgetStyle );
 291 }
 292