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     PreCreation( parent, id, pos, size, style, name );
 141
 142 #if wxUSE_VALIDATORS
 143     SetValidator( validator );
 144 #endif
 145
 146     m_oldPos = 0.0;
 147
 148     if (style & wxSB_VERTICAL == wxSB_VERTICAL)
 149         m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 150     else
 151         m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 152
 153     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 154
 155     gtk_signal_connect( GTK_OBJECT(m_adjust),
 156                         "value_changed",
 157                         (GtkSignalFunc) gtk_scrollbar_callback,
 158                         (gpointer) this );
 159
 160     gtk_signal_connect( GTK_OBJECT(m_widget),
 161                         "button_press_event",
 162                         (GtkSignalFunc)gtk_scrollbar_button_press_callback,
 163                         (gpointer) this );
 164
 165     gtk_signal_connect( GTK_OBJECT(m_widget),
 166                         "button_release_event",
 167                         (GtkSignalFunc)gtk_scrollbar_button_release_callback,
 168                         (gpointer) this );
 169
 170     m_parent->DoAddChild( this );
 171
 172     PostCreation();
 173
 174     SetBackgroundColour( parent->GetBackgroundColour() );
 175
 176     Show( TRUE );
 177
 178     return TRUE;
 179 }
 180
 181 int wxScrollBar::GetThumbPosition(void) const
 182 {
 183     return (int)(m_adjust->value+0.5);
 184 }
 185
 186 int wxScrollBar::GetThumbSize() const
 187 {
 188     return (int)(m_adjust->page_size+0.5);
 189 }
 190
 191 int wxScrollBar::GetPageSize() const
 192 {
 193     return (int)(m_adjust->page_increment+0.5);
 194 }
 195
 196 int wxScrollBar::GetRange() const
 197 {
 198     return (int)(m_adjust->upper+0.5);
 199 }
 200
 201 void wxScrollBar::SetThumbPosition( int viewStart )
 202 {
 203     if (m_isScrolling) return;
 204
 205     float fpos = (float)viewStart;
 206     m_oldPos = fpos;
 207     if (fabs(fpos-m_adjust->value) < 0.2) return;
 208     m_adjust->value = fpos;
 209
 210     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 211 }
 212
 213 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 214       bool WXUNUSED(refresh) )
 215 {
 216     float fpos = (float)position;
 217     float frange = (float)range;
 218     float fthumb = (float)thumbSize;
 219     float fpage = (float)pageSize;
 220
 221     if ((fabs(frange-m_adjust->upper) < 0.2) &&
 222         (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 223         (fabs(fpage-m_adjust->page_increment) < 0.2))
 224     {
 225         SetThumbPosition( position );
 226         return;
 227     }
 228
 229     m_oldPos = fpos;
 230
 231     m_adjust->lower = 0.0;
 232     m_adjust->upper = frange;
 233     m_adjust->value = fpos;
 234     m_adjust->step_increment = 1.0;
 235     m_adjust->page_increment = (float)(wxMax(fpage,0));
 236     m_adjust->page_size = fthumb;
 237
 238     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 239 }
 240
 241 /* Backward compatibility */
 242 int wxScrollBar::GetValue(void) const
 243 {
 244     return GetThumbPosition();
 245 }
 246
 247 void wxScrollBar::SetValue( int viewStart )
 248 {
 249     SetThumbPosition( viewStart );
 250 }
 251
 252 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 253 {
 254     int pos = (int)(m_adjust->value+0.5);
 255     int thumb = (int)(m_adjust->page_size+0.5);
 256     int page = (int)(m_adjust->page_increment+0.5);
 257     int range = (int)(m_adjust->upper+0.5);
 258
 259     *viewStart = pos;
 260     *viewLength = range;
 261     *objectLength = thumb;
 262     *pageLength = page;
 263 }
 264
 265 int wxScrollBar::GetViewLength() const
 266 {
 267     return (int)(m_adjust->upper+0.5);
 268 }
 269
 270 int wxScrollBar::GetObjectLength() const
 271 {
 272     return (int)(m_adjust->page_size+0.5);
 273 }
 274
 275 void wxScrollBar::SetPageSize( int pageLength )
 276 {
 277     int pos = (int)(m_adjust->value+0.5);
 278     int thumb = (int)(m_adjust->page_size+0.5);
 279     int range = (int)(m_adjust->upper+0.5);
 280     SetScrollbar( pos, thumb, range, pageLength );
 281 }
 282
 283 void wxScrollBar::SetObjectLength( int objectLength )
 284 {
 285     int pos = (int)(m_adjust->value+0.5);
 286     int page = (int)(m_adjust->page_increment+0.5);
 287     int range = (int)(m_adjust->upper+0.5);
 288     SetScrollbar( pos, objectLength, range, page );
 289 }
 290
 291 void wxScrollBar::SetViewLength( int viewLength )
 292 {
 293     int pos = (int)(m_adjust->value+0.5);
 294     int thumb = (int)(m_adjust->page_size+0.5);
 295     int page = (int)(m_adjust->page_increment+0.5);
 296     SetScrollbar( pos, thumb, viewLength, page );
 297 }
 298
 299 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 300 {
 301     GtkRange *range = GTK_RANGE(m_widget);
 302     return ( (window == GTK_WIDGET(range)->window) ||
 303              (window == range->trough) ||
 304              (window == range->slider) ||
 305              (window == range->step_forw) ||
 306              (window == range->step_back) );
 307 }
 308
 309 void wxScrollBar::ApplyWidgetStyle()
 310 {
 311     SetWidgetStyle();
 312     gtk_widget_set_style( m_widget, m_widgetStyle );
 313 }
 314
 315 #endif