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