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->SetScrolling(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     win->SetScrolling(FALSE);
 108 //  g_blockEventsOnScroll = FALSE;
 109
 110     gtk_signal_emit_by_name( GTK_OBJECT(win->m_adjust), "value_changed" );
 111
 112     return FALSE;
 113 }
 114
 115 //-----------------------------------------------------------------------------
 116 // wxScrollBar
 117 //-----------------------------------------------------------------------------
 118
 119 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
 120
 121 wxScrollBar::~wxScrollBar(void)
 122 {
 123 }
 124
 125 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 126            const wxPoint& pos, const wxSize& size,
 127            long style, const wxValidator& validator, const wxString& name )
 128 {
 129     m_needParent = TRUE;
 130     m_acceptsFocus = TRUE;
 131
 132     if (!PreCreation( parent, pos, size ) ||
 133         !CreateBase( parent, id, pos, size, style, validator, name ))
 134     {
 135         wxFAIL_MSG( wxT("wxScrollBar creation failed") );
 136         return FALSE;
 137     }
 138
 139     m_oldPos = 0.0;
 140
 141     if ((style & wxSB_VERTICAL) == wxSB_VERTICAL)
 142         m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 143     else
 144         m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 145
 146     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 147
 148     gtk_signal_connect( GTK_OBJECT(m_adjust),
 149                         "value_changed",
 150                         (GtkSignalFunc) gtk_scrollbar_callback,
 151                         (gpointer) this );
 152
 153     gtk_signal_connect( GTK_OBJECT(m_widget),
 154                         "button_press_event",
 155                         (GtkSignalFunc)gtk_scrollbar_button_press_callback,
 156                         (gpointer) this );
 157
 158     gtk_signal_connect( GTK_OBJECT(m_widget),
 159                         "button_release_event",
 160                         (GtkSignalFunc)gtk_scrollbar_button_release_callback,
 161                         (gpointer) this );
 162
 163     m_parent->DoAddChild( this );
 164
 165     PostCreation();
 166
 167     SetBackgroundColour( parent->GetBackgroundColour() );
 168
 169     Show( TRUE );
 170
 171     return TRUE;
 172 }
 173
 174 int wxScrollBar::GetThumbPosition(void) const
 175 {
 176     return (int)(m_adjust->value+0.5);
 177 }
 178
 179 int wxScrollBar::GetThumbSize() const
 180 {
 181     return (int)(m_adjust->page_size+0.5);
 182 }
 183
 184 int wxScrollBar::GetPageSize() const
 185 {
 186     return (int)(m_adjust->page_increment+0.5);
 187 }
 188
 189 int wxScrollBar::GetRange() const
 190 {
 191     return (int)(m_adjust->upper+0.5);
 192 }
 193
 194 void wxScrollBar::SetThumbPosition( int viewStart )
 195 {
 196     if (m_isScrolling) return;
 197
 198     float fpos = (float)viewStart;
 199     m_oldPos = fpos;
 200     if (fabs(fpos-m_adjust->value) < 0.2) return;
 201     m_adjust->value = fpos;
 202
 203     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 204 }
 205
 206 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 207       bool WXUNUSED(refresh) )
 208 {
 209     float fpos = (float)position;
 210     float frange = (float)range;
 211     float fthumb = (float)thumbSize;
 212     float fpage = (float)pageSize;
 213
 214     if ((fabs(frange-m_adjust->upper) < 0.2) &&
 215         (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 216         (fabs(fpage-m_adjust->page_increment) < 0.2))
 217     {
 218         SetThumbPosition( position );
 219         return;
 220     }
 221
 222     m_oldPos = fpos;
 223
 224     m_adjust->lower = 0.0;
 225     m_adjust->upper = frange;
 226     m_adjust->value = fpos;
 227     m_adjust->step_increment = 1.0;
 228     m_adjust->page_increment = (float)(wxMax(fpage,0));
 229     m_adjust->page_size = fthumb;
 230
 231     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 232 }
 233
 234 /* Backward compatibility */
 235 int wxScrollBar::GetValue(void) const
 236 {
 237     return GetThumbPosition();
 238 }
 239
 240 void wxScrollBar::SetValue( int viewStart )
 241 {
 242     SetThumbPosition( viewStart );
 243 }
 244
 245 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 246 {
 247     int pos = (int)(m_adjust->value+0.5);
 248     int thumb = (int)(m_adjust->page_size+0.5);
 249     int page = (int)(m_adjust->page_increment+0.5);
 250     int range = (int)(m_adjust->upper+0.5);
 251
 252     *viewStart = pos;
 253     *viewLength = range;
 254     *objectLength = thumb;
 255     *pageLength = page;
 256 }
 257
 258 int wxScrollBar::GetViewLength() const
 259 {
 260     return (int)(m_adjust->upper+0.5);
 261 }
 262
 263 int wxScrollBar::GetObjectLength() const
 264 {
 265     return (int)(m_adjust->page_size+0.5);
 266 }
 267
 268 void wxScrollBar::SetPageSize( int pageLength )
 269 {
 270     int pos = (int)(m_adjust->value+0.5);
 271     int thumb = (int)(m_adjust->page_size+0.5);
 272     int range = (int)(m_adjust->upper+0.5);
 273     SetScrollbar( pos, thumb, range, pageLength );
 274 }
 275
 276 void wxScrollBar::SetObjectLength( int objectLength )
 277 {
 278     int pos = (int)(m_adjust->value+0.5);
 279     int page = (int)(m_adjust->page_increment+0.5);
 280     int range = (int)(m_adjust->upper+0.5);
 281     SetScrollbar( pos, objectLength, range, page );
 282 }
 283
 284 void wxScrollBar::SetViewLength( int viewLength )
 285 {
 286     int pos = (int)(m_adjust->value+0.5);
 287     int thumb = (int)(m_adjust->page_size+0.5);
 288     int page = (int)(m_adjust->page_increment+0.5);
 289     SetScrollbar( pos, thumb, viewLength, page );
 290 }
 291
 292 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 293 {
 294     GtkRange *range = GTK_RANGE(m_widget);
 295     return ( (window == GTK_WIDGET(range)->window) ||
 296              (window == range->trough) ||
 297              (window == range->slider) ||
 298              (window == range->step_forw) ||
 299              (window == range->step_back) );
 300 }
 301
 302 void wxScrollBar::ApplyWidgetStyle()
 303 {
 304     SetWidgetStyle();
 305     gtk_widget_set_style( m_widget, m_widgetStyle );
 306 }
 307
 308 #endif