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 *widget,
  86                                                  GdkEventButton *gdk_event,
  87                                                  wxScrollBar *win )
  88 {
  89     if (g_isIdle) wxapp_install_idle_handler();
  90
  91 //  g_blockEventsOnScroll = TRUE;  doesn't work in DialogEd
  92
  93     win->m_isScrolling = (gdk_event->window == widget->slider);
  94
  95     return FALSE;
  96 }
  97
  98 //-----------------------------------------------------------------------------
  99 // "button_release_event" from slider
 100 //-----------------------------------------------------------------------------
 101
 102 static gint gtk_scrollbar_button_release_callback( GtkRange *WXUNUSED(widget),
 103                                                    GdkEventButton *WXUNUSED(gdk_event),
 104                                                    wxScrollBar *win )
 105 {
 106     if (g_isIdle) wxapp_install_idle_handler();
 107
 108 //  g_blockEventsOnScroll = FALSE;
 109
 110     if (win->m_isScrolling)
 111     {
 112         wxEventType command = wxEVT_SCROLL_THUMBRELEASE;
 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.SetEventObject( win );
 118         win->GetEventHandler()->ProcessEvent( event );
 119     }
 120
 121     win->m_isScrolling = FALSE;
 122
 123     return FALSE;
 124 }
 125
 126 //-----------------------------------------------------------------------------
 127 // wxScrollBar
 128 //-----------------------------------------------------------------------------
 129
 130 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
 131
 132 wxScrollBar::~wxScrollBar(void)
 133 {
 134 }
 135
 136 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 137            const wxPoint& pos, const wxSize& size,
 138            long style, const wxValidator& validator, const wxString& name )
 139 {
 140     m_needParent = TRUE;
 141     m_acceptsFocus = TRUE;
 142
 143     if (!PreCreation( parent, pos, size ) ||
 144         !CreateBase( parent, id, pos, size, style, validator, name ))
 145     {
 146         wxFAIL_MSG( wxT("wxScrollBar creation failed") );
 147         return FALSE;
 148     }
 149
 150     m_oldPos = 0.0;
 151
 152     if ((style & wxSB_VERTICAL) == wxSB_VERTICAL)
 153         m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 154     else
 155         m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 156
 157     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 158
 159     gtk_signal_connect( GTK_OBJECT(m_adjust),
 160                         "value_changed",
 161                         (GtkSignalFunc) gtk_scrollbar_callback,
 162                         (gpointer) this );
 163
 164     gtk_signal_connect( GTK_OBJECT(m_widget),
 165                         "button_press_event",
 166                         (GtkSignalFunc)gtk_scrollbar_button_press_callback,
 167                         (gpointer) this );
 168
 169     gtk_signal_connect( GTK_OBJECT(m_widget),
 170                         "button_release_event",
 171                         (GtkSignalFunc)gtk_scrollbar_button_release_callback,
 172                         (gpointer) this );
 173
 174     m_parent->DoAddChild( this );
 175
 176     PostCreation();
 177
 178     SetBackgroundColour( parent->GetBackgroundColour() );
 179
 180     Show( TRUE );
 181
 182     return TRUE;
 183 }
 184
 185 int wxScrollBar::GetThumbPosition(void) const
 186 {
 187     return (int)(m_adjust->value+0.5);
 188 }
 189
 190 int wxScrollBar::GetThumbSize() const
 191 {
 192     return (int)(m_adjust->page_size+0.5);
 193 }
 194
 195 int wxScrollBar::GetPageSize() const
 196 {
 197     return (int)(m_adjust->page_increment+0.5);
 198 }
 199
 200 int wxScrollBar::GetRange() const
 201 {
 202     return (int)(m_adjust->upper+0.5);
 203 }
 204
 205 void wxScrollBar::SetThumbPosition( int viewStart )
 206 {
 207     if (m_isScrolling) return;
 208
 209     float fpos = (float)viewStart;
 210     m_oldPos = fpos;
 211     if (fabs(fpos-m_adjust->value) < 0.2) return;
 212     m_adjust->value = fpos;
 213
 214     gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust),
 215                         (GtkSignalFunc) gtk_scrollbar_callback,
 216                         (gpointer) this );
 217
 218     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 219
 220     gtk_signal_connect( GTK_OBJECT(m_adjust),
 221                         "value_changed",
 222                         (GtkSignalFunc) gtk_scrollbar_callback,
 223                         (gpointer) this );
 224 }
 225
 226 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 227       bool WXUNUSED(refresh) )
 228 {
 229     float fpos = (float)position;
 230     float frange = (float)range;
 231     float fthumb = (float)thumbSize;
 232     float fpage = (float)pageSize;
 233
 234     if ((fabs(frange-m_adjust->upper) < 0.2) &&
 235         (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 236         (fabs(fpage-m_adjust->page_increment) < 0.2))
 237     {
 238         SetThumbPosition( position );
 239         return;
 240     }
 241
 242     m_oldPos = fpos;
 243
 244     m_adjust->lower = 0.0;
 245     m_adjust->upper = frange;
 246     m_adjust->value = fpos;
 247     m_adjust->step_increment = 1.0;
 248     m_adjust->page_increment = (float)(wxMax(fpage,0));
 249     m_adjust->page_size = fthumb;
 250
 251     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 252 }
 253
 254 /* Backward compatibility */
 255 int wxScrollBar::GetValue(void) const
 256 {
 257     return GetThumbPosition();
 258 }
 259
 260 void wxScrollBar::SetValue( int viewStart )
 261 {
 262     SetThumbPosition( viewStart );
 263 }
 264
 265 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 266 {
 267     int pos = (int)(m_adjust->value+0.5);
 268     int thumb = (int)(m_adjust->page_size+0.5);
 269     int page = (int)(m_adjust->page_increment+0.5);
 270     int range = (int)(m_adjust->upper+0.5);
 271
 272     *viewStart = pos;
 273     *viewLength = range;
 274     *objectLength = thumb;
 275     *pageLength = page;
 276 }
 277
 278 int wxScrollBar::GetViewLength() const
 279 {
 280     return (int)(m_adjust->upper+0.5);
 281 }
 282
 283 int wxScrollBar::GetObjectLength() const
 284 {
 285     return (int)(m_adjust->page_size+0.5);
 286 }
 287
 288 void wxScrollBar::SetPageSize( int pageLength )
 289 {
 290     int pos = (int)(m_adjust->value+0.5);
 291     int thumb = (int)(m_adjust->page_size+0.5);
 292     int range = (int)(m_adjust->upper+0.5);
 293     SetScrollbar( pos, thumb, range, pageLength );
 294 }
 295
 296 void wxScrollBar::SetObjectLength( int objectLength )
 297 {
 298     int pos = (int)(m_adjust->value+0.5);
 299     int page = (int)(m_adjust->page_increment+0.5);
 300     int range = (int)(m_adjust->upper+0.5);
 301     SetScrollbar( pos, objectLength, range, page );
 302 }
 303
 304 void wxScrollBar::SetViewLength( int viewLength )
 305 {
 306     int pos = (int)(m_adjust->value+0.5);
 307     int thumb = (int)(m_adjust->page_size+0.5);
 308     int page = (int)(m_adjust->page_increment+0.5);
 309     SetScrollbar( pos, thumb, viewLength, page );
 310 }
 311
 312 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 313 {
 314     GtkRange *range = GTK_RANGE(m_widget);
 315     return ( (window == GTK_WIDGET(range)->window) ||
 316              (window == range->trough) ||
 317              (window == range->slider) ||
 318              (window == range->step_forw) ||
 319              (window == range->step_back) );
 320 }
 321
 322 void wxScrollBar::ApplyWidgetStyle()
 323 {
 324     SetWidgetStyle();
 325     gtk_widget_set_style( m_widget, m_widgetStyle );
 326 }
 327
 328 #endif