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