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