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