src/gtk/scrolbar.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/gtk/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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  12 #pragma implementation "scrolbar.h"
  13 #endif
  14
  15 // For compilers that support precompilation, includes "wx.h".
  16 #include "wx/wxprec.h"
  17
  18 #if wxUSE_SCROLLBAR
  19
  20 #include "wx/scrolbar.h"
  21
  22 #include "wx/utils.h"
  23
  24 #include <math.h>
  25
  26 #include "wx/gtk/private.h"
  27
  28 //-----------------------------------------------------------------------------
  29 // idle system
  30 //-----------------------------------------------------------------------------
  31
  32 extern void wxapp_install_idle_handler();
  33 extern bool g_isIdle;
  34
  35 //-----------------------------------------------------------------------------
  36 // data
  37 //-----------------------------------------------------------------------------
  38
  39 extern bool   g_blockEventsOnDrag;
  40 extern bool   g_blockEventsOnScroll;
  41
  42 static const float sensitivity = 0.02;
  43
  44 //-----------------------------------------------------------------------------
  45 // "value_changed"
  46 //-----------------------------------------------------------------------------
  47
  48 // FIXME: is GtkScrollType really passed to us as 2nd argument?
  49
  50 static void gtk_scrollbar_callback( GtkAdjustment *adjust,
  51                                     SCROLLBAR_CBACK_ARG
  52                                     wxScrollBar *win )
  53 {
  54     if (g_isIdle) wxapp_install_idle_handler();
  55
  56     if (!win->m_hasVMT) return;
  57     if (g_blockEventsOnDrag) return;
  58
  59     float diff = adjust->value - win->m_oldPos;
  60     if (fabs(diff) < sensitivity) return;
  61
  62     win->m_oldPos = adjust->value;
  63
  64     wxEventType command = GtkScrollTypeToWx(GET_SCROLL_TYPE(win->m_widget));
  65
  66     double dvalue = adjust->value;
  67     int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5);
  68
  69     int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
  70
  71     wxScrollEvent event( command, win->GetId(), value, orient );
  72     event.SetEventObject( win );
  73     win->GetEventHandler()->ProcessEvent( event );
  74
  75 /*
  76     wxCommandEvent cevent( wxEVT_COMMAND_SCROLLBAR_UPDATED, win->GetId() );
  77     cevent.SetEventObject( win );
  78     win->ProcessEvent( cevent );
  79 */
  80 }
  81
  82 //-----------------------------------------------------------------------------
  83 // "button_press_event" from slider
  84 //-----------------------------------------------------------------------------
  85
  86 static gint gtk_scrollbar_button_press_callback( GtkRange *widget,
  87                                                  GdkEventButton *gdk_event,
  88                                                  wxScrollBar *win )
  89 {
  90     if (g_isIdle) wxapp_install_idle_handler();
  91
  92 //  g_blockEventsOnScroll = TRUE;  doesn't work in DialogEd
  93
  94     // FIXME: there is no slider field any more, what was meant here?
  95 #ifndef __WXGTK20__
  96     win->m_isScrolling = (gdk_event->window == widget->slider);
  97 #endif
  98
  99     return FALSE;
 100 }
 101
 102 //-----------------------------------------------------------------------------
 103 // "button_release_event" from slider
 104 //-----------------------------------------------------------------------------
 105
 106 static gint
 107 gtk_scrollbar_button_release_callback( GtkRange *WXUNUSED(widget),
 108                                        GdkEventButton *WXUNUSED(gdk_event),
 109                                        wxScrollBar *win )
 110 {
 111     if (g_isIdle)
 112         wxapp_install_idle_handler();
 113
 114 //  g_blockEventsOnScroll = FALSE;
 115
 116     if (win->m_isScrolling)
 117     {
 118         wxEventType command = wxEVT_SCROLL_THUMBRELEASE;
 119         int value = (int)ceil(win->m_adjust->value);
 120         int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
 121
 122         wxScrollEvent event( command, win->GetId(), value, orient );
 123         event.SetEventObject( win );
 124         win->GetEventHandler()->ProcessEvent( event );
 125     }
 126
 127     win->m_isScrolling = FALSE;
 128
 129     return FALSE;
 130 }
 131
 132 //-----------------------------------------------------------------------------
 133 // wxScrollBar
 134 //-----------------------------------------------------------------------------
 135
 136 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
 137
 138 wxScrollBar::~wxScrollBar()
 139 {
 140 }
 141
 142 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 143            const wxPoint& pos, const wxSize& size,
 144            long style, const wxValidator& validator, const wxString& name )
 145 {
 146     m_needParent = TRUE;
 147     m_acceptsFocus = TRUE;
 148
 149     if (!PreCreation( parent, pos, size ) ||
 150         !CreateBase( parent, id, pos, size, style, validator, name ))
 151     {
 152         wxFAIL_MSG( wxT("wxScrollBar creation failed") );
 153         return FALSE;
 154     }
 155
 156     m_oldPos = 0.0;
 157
 158     if ((style & wxSB_VERTICAL) == wxSB_VERTICAL)
 159         m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 160     else
 161         m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 162
 163     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 164
 165     gtk_signal_connect( GTK_OBJECT(m_adjust),
 166                         "value_changed",
 167                         (GtkSignalFunc) gtk_scrollbar_callback,
 168                         (gpointer) this );
 169
 170     gtk_signal_connect( GTK_OBJECT(m_widget),
 171                         "button_press_event",
 172                         (GtkSignalFunc)gtk_scrollbar_button_press_callback,
 173                         (gpointer) this );
 174
 175     gtk_signal_connect( GTK_OBJECT(m_widget),
 176                         "button_release_event",
 177                         (GtkSignalFunc)gtk_scrollbar_button_release_callback,
 178                         (gpointer) this );
 179
 180     m_parent->DoAddChild( this );
 181
 182     PostCreation();
 183     InheritAttributes();
 184
 185     SetBestSize(size);
 186
 187     Show( TRUE );
 188
 189     return TRUE;
 190 }
 191
 192 int wxScrollBar::GetThumbPosition() const
 193 {
 194     double val = m_adjust->value;
 195     return (int)(val < 0 ? val - 0.5 : val + 0.5);
 196 }
 197
 198 int wxScrollBar::GetThumbSize() const
 199 {
 200     return (int)(m_adjust->page_size+0.5);
 201 }
 202
 203 int wxScrollBar::GetPageSize() const
 204 {
 205     return (int)(m_adjust->page_increment+0.5);
 206 }
 207
 208 int wxScrollBar::GetRange() const
 209 {
 210     return (int)(m_adjust->upper+0.5);
 211 }
 212
 213 void wxScrollBar::SetThumbPosition( int viewStart )
 214 {
 215     if (m_isScrolling) return;
 216
 217     float fpos = (float)viewStart;
 218     m_oldPos = fpos;
 219     if (fabs(fpos-m_adjust->value) < 0.2) return;
 220     m_adjust->value = fpos;
 221
 222     gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust),
 223                         (GtkSignalFunc) gtk_scrollbar_callback,
 224                         (gpointer) this );
 225
 226     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 227
 228     gtk_signal_connect( GTK_OBJECT(m_adjust),
 229                         "value_changed",
 230                         (GtkSignalFunc) gtk_scrollbar_callback,
 231                         (gpointer) this );
 232 }
 233
 234 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 235       bool WXUNUSED(refresh) )
 236 {
 237     float fpos = (float)position;
 238     float frange = (float)range;
 239     float fthumb = (float)thumbSize;
 240     float fpage = (float)pageSize;
 241
 242     if ((fabs(frange-m_adjust->upper) < 0.2) &&
 243         (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 244         (fabs(fpage-m_adjust->page_increment) < 0.2))
 245     {
 246         SetThumbPosition( position );
 247         return;
 248     }
 249
 250     m_oldPos = fpos;
 251
 252     m_adjust->lower = 0.0;
 253     m_adjust->upper = frange;
 254     m_adjust->value = fpos;
 255     m_adjust->step_increment = 1.0;
 256     m_adjust->page_increment = (float)(wxMax(fpage,0));
 257     m_adjust->page_size = fthumb;
 258
 259     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 260 }
 261
 262 /* Backward compatibility */
 263 int wxScrollBar::GetValue() const
 264 {
 265     return GetThumbPosition();
 266 }
 267
 268 void wxScrollBar::SetValue( int viewStart )
 269 {
 270     SetThumbPosition( viewStart );
 271 }
 272
 273 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 274 {
 275     int pos = (int)(m_adjust->value+0.5);
 276     int thumb = (int)(m_adjust->page_size+0.5);
 277     int page = (int)(m_adjust->page_increment+0.5);
 278     int range = (int)(m_adjust->upper+0.5);
 279
 280     *viewStart = pos;
 281     *viewLength = range;
 282     *objectLength = thumb;
 283     *pageLength = page;
 284 }
 285
 286 int wxScrollBar::GetViewLength() const
 287 {
 288     return (int)(m_adjust->upper+0.5);
 289 }
 290
 291 int wxScrollBar::GetObjectLength() const
 292 {
 293     return (int)(m_adjust->page_size+0.5);
 294 }
 295
 296 void wxScrollBar::SetPageSize( int pageLength )
 297 {
 298     int pos = (int)(m_adjust->value+0.5);
 299     int thumb = (int)(m_adjust->page_size+0.5);
 300     int range = (int)(m_adjust->upper+0.5);
 301     SetScrollbar( pos, thumb, range, pageLength );
 302 }
 303
 304 void wxScrollBar::SetObjectLength( int objectLength )
 305 {
 306     int pos = (int)(m_adjust->value+0.5);
 307     int page = (int)(m_adjust->page_increment+0.5);
 308     int range = (int)(m_adjust->upper+0.5);
 309     SetScrollbar( pos, objectLength, range, page );
 310 }
 311
 312 void wxScrollBar::SetViewLength( int viewLength )
 313 {
 314     int pos = (int)(m_adjust->value+0.5);
 315     int thumb = (int)(m_adjust->page_size+0.5);
 316     int page = (int)(m_adjust->page_increment+0.5);
 317     SetScrollbar( pos, thumb, viewLength, page );
 318 }
 319
 320 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 321 {
 322     GtkRange *range = GTK_RANGE(m_widget);
 323     return ( (window == GTK_WIDGET(range)->window)
 324 #ifndef __WXGTK20__
 325                 || (window == range->trough)
 326                 || (window == range->slider)
 327                 || (window == range->step_forw)
 328                 || (window == range->step_back)
 329 #endif // GTK+ 1.x
 330            );
 331 }
 332
 333 void wxScrollBar::ApplyWidgetStyle()
 334 {
 335     SetWidgetStyle();
 336     gtk_widget_set_style( m_widget, m_widgetStyle );
 337 }
 338
 339 wxSize wxScrollBar::DoGetBestSize() const
 340 {
 341     return wxControl::DoGetBestSize();
 342 }
 343
 344 #endif