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
  17 #if wxUSE_SCROLLBAR
  18
  19 #include "wx/utils.h"
  20
  21 #include <math.h>
  22
  23 #include <gdk/gdk.h>
  24 #include <gtk/gtk.h>
  25
  26 //-----------------------------------------------------------------------------
  27 // idle system
  28 //-----------------------------------------------------------------------------
  29
  30 extern void wxapp_install_idle_handler();
  31 extern bool g_isIdle;
  32
  33 //-----------------------------------------------------------------------------
  34 // data
  35 //-----------------------------------------------------------------------------
  36
  37 extern bool   g_blockEventsOnDrag;
  38 extern bool   g_blockEventsOnScroll;
  39
  40 static const float sensitivity = 0.02;
  41
  42 //-----------------------------------------------------------------------------
  43 // "value_changed"
  44 //-----------------------------------------------------------------------------
  45
  46 static void gtk_scrollbar_callback( GtkAdjustment *adjust, wxScrollBar *win )
  47 {
  48     if (g_isIdle) wxapp_install_idle_handler();
  49
  50     if (!win->m_hasVMT) return;
  51     if (g_blockEventsOnDrag) return;
  52
  53     float diff = adjust->value - win->m_oldPos;
  54     if (fabs(diff) < sensitivity) return;
  55
  56     win->m_oldPos = adjust->value;
  57
  58     GtkRange *range = GTK_RANGE( win->m_widget );
  59
  60     wxEventType command = wxEVT_SCROLL_THUMBTRACK;
  61     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLL_LINEUP;
  62     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLL_LINEDOWN;
  63     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLL_PAGEUP;
  64     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLL_PAGEDOWN;
  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     win->m_isScrolling = (gdk_event->window == widget->slider);
  95
  96     return FALSE;
  97 }
  98
  99 //-----------------------------------------------------------------------------
 100 // "button_release_event" from slider
 101 //-----------------------------------------------------------------------------
 102
 103 static gint gtk_scrollbar_button_release_callback( GtkRange *WXUNUSED(widget),
 104                                                    GdkEventButton *WXUNUSED(gdk_event),
 105                                                    wxScrollBar *win )
 106 {
 107     if (g_isIdle) wxapp_install_idle_handler();
 108
 109 //  g_blockEventsOnScroll = FALSE;
 110
 111     if (win->m_isScrolling)
 112     {
 113         wxEventType command = wxEVT_SCROLL_THUMBRELEASE;
 114         int value = (int)ceil(win->m_adjust->value);
 115         int dir = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
 116
 117         wxScrollEvent event( command, value, dir );
 118         event.SetEventObject( win );
 119         win->GetEventHandler()->ProcessEvent( event );
 120     }
 121
 122     win->m_isScrolling = FALSE;
 123
 124     return FALSE;
 125 }
 126
 127 //-----------------------------------------------------------------------------
 128 // wxScrollBar
 129 //-----------------------------------------------------------------------------
 130
 131 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
 132
 133 wxScrollBar::~wxScrollBar()
 134 {
 135 }
 136
 137 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 138            const wxPoint& pos, const wxSize& size,
 139            long style, const wxValidator& validator, const wxString& name )
 140 {
 141     m_needParent = TRUE;
 142     m_acceptsFocus = TRUE;
 143
 144     if (!PreCreation( parent, pos, size ) ||
 145         !CreateBase( parent, id, pos, size, style, validator, name ))
 146     {
 147         wxFAIL_MSG( wxT("wxScrollBar creation failed") );
 148         return FALSE;
 149     }
 150
 151     m_oldPos = 0.0;
 152
 153     if ((style & wxSB_VERTICAL) == wxSB_VERTICAL)
 154         m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 155     else
 156         m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 157
 158     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 159
 160     gtk_signal_connect( GTK_OBJECT(m_adjust),
 161                         "value_changed",
 162                         (GtkSignalFunc) gtk_scrollbar_callback,
 163                         (gpointer) this );
 164
 165     gtk_signal_connect( GTK_OBJECT(m_widget),
 166                         "button_press_event",
 167                         (GtkSignalFunc)gtk_scrollbar_button_press_callback,
 168                         (gpointer) this );
 169
 170     gtk_signal_connect( GTK_OBJECT(m_widget),
 171                         "button_release_event",
 172                         (GtkSignalFunc)gtk_scrollbar_button_release_callback,
 173                         (gpointer) this );
 174
 175     m_parent->DoAddChild( this );
 176
 177     PostCreation();
 178
 179     SetBackgroundColour( parent->GetBackgroundColour() );
 180
 181     Show( TRUE );
 182
 183     return TRUE;
 184 }
 185
 186 int wxScrollBar::GetThumbPosition() const
 187 {
 188     double val = m_adjust->value;
 189     return (int)(val >= 0 ? val - 0.5 : val + 0.5);
 190 }
 191
 192 int wxScrollBar::GetThumbSize() const
 193 {
 194     return (int)(m_adjust->page_size+0.5);
 195 }
 196
 197 int wxScrollBar::GetPageSize() const
 198 {
 199     return (int)(m_adjust->page_increment+0.5);
 200 }
 201
 202 int wxScrollBar::GetRange() const
 203 {
 204     return (int)(m_adjust->upper+0.5);
 205 }
 206
 207 void wxScrollBar::SetThumbPosition( int viewStart )
 208 {
 209     if (m_isScrolling) return;
 210
 211     float fpos = (float)viewStart;
 212     m_oldPos = fpos;
 213     if (fabs(fpos-m_adjust->value) < 0.2) return;
 214     m_adjust->value = fpos;
 215
 216     gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust),
 217                         (GtkSignalFunc) gtk_scrollbar_callback,
 218                         (gpointer) this );
 219
 220     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 221
 222     gtk_signal_connect( GTK_OBJECT(m_adjust),
 223                         "value_changed",
 224                         (GtkSignalFunc) gtk_scrollbar_callback,
 225                         (gpointer) this );
 226 }
 227
 228 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 229       bool WXUNUSED(refresh) )
 230 {
 231     float fpos = (float)position;
 232     float frange = (float)range;
 233     float fthumb = (float)thumbSize;
 234     float fpage = (float)pageSize;
 235
 236     if ((fabs(frange-m_adjust->upper) < 0.2) &&
 237         (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 238         (fabs(fpage-m_adjust->page_increment) < 0.2))
 239     {
 240         SetThumbPosition( position );
 241         return;
 242     }
 243
 244     m_oldPos = fpos;
 245
 246     m_adjust->lower = 0.0;
 247     m_adjust->upper = frange;
 248     m_adjust->value = fpos;
 249     m_adjust->step_increment = 1.0;
 250     m_adjust->page_increment = (float)(wxMax(fpage,0));
 251     m_adjust->page_size = fthumb;
 252
 253     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 254 }
 255
 256 /* Backward compatibility */
 257 int wxScrollBar::GetValue() const
 258 {
 259     return GetThumbPosition();
 260 }
 261
 262 void wxScrollBar::SetValue( int viewStart )
 263 {
 264     SetThumbPosition( viewStart );
 265 }
 266
 267 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 268 {
 269     int pos = (int)(m_adjust->value+0.5);
 270     int thumb = (int)(m_adjust->page_size+0.5);
 271     int page = (int)(m_adjust->page_increment+0.5);
 272     int range = (int)(m_adjust->upper+0.5);
 273
 274     *viewStart = pos;
 275     *viewLength = range;
 276     *objectLength = thumb;
 277     *pageLength = page;
 278 }
 279
 280 int wxScrollBar::GetViewLength() const
 281 {
 282     return (int)(m_adjust->upper+0.5);
 283 }
 284
 285 int wxScrollBar::GetObjectLength() const
 286 {
 287     return (int)(m_adjust->page_size+0.5);
 288 }
 289
 290 void wxScrollBar::SetPageSize( int pageLength )
 291 {
 292     int pos = (int)(m_adjust->value+0.5);
 293     int thumb = (int)(m_adjust->page_size+0.5);
 294     int range = (int)(m_adjust->upper+0.5);
 295     SetScrollbar( pos, thumb, range, pageLength );
 296 }
 297
 298 void wxScrollBar::SetObjectLength( int objectLength )
 299 {
 300     int pos = (int)(m_adjust->value+0.5);
 301     int page = (int)(m_adjust->page_increment+0.5);
 302     int range = (int)(m_adjust->upper+0.5);
 303     SetScrollbar( pos, objectLength, range, page );
 304 }
 305
 306 void wxScrollBar::SetViewLength( int viewLength )
 307 {
 308     int pos = (int)(m_adjust->value+0.5);
 309     int thumb = (int)(m_adjust->page_size+0.5);
 310     int page = (int)(m_adjust->page_increment+0.5);
 311     SetScrollbar( pos, thumb, viewLength, page );
 312 }
 313
 314 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 315 {
 316     GtkRange *range = GTK_RANGE(m_widget);
 317     return ( (window == GTK_WIDGET(range)->window) ||
 318              (window == range->trough) ||
 319              (window == range->slider) ||
 320              (window == range->step_forw) ||
 321              (window == range->step_back) );
 322 }
 323
 324 void wxScrollBar::ApplyWidgetStyle()
 325 {
 326     SetWidgetStyle();
 327     gtk_widget_set_style( m_widget, m_widgetStyle );
 328 }
 329
 330 #endif