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 // idle system
  24 //-----------------------------------------------------------------------------
  25
  26 extern void wxapp_install_idle_handler();
  27 extern bool g_isIdle;
  28
  29 //-----------------------------------------------------------------------------
  30 // data
  31 //-----------------------------------------------------------------------------
  32
  33 extern bool   g_blockEventsOnDrag;
  34 extern bool   g_blockEventsOnScroll;
  35
  36 //-----------------------------------------------------------------------------
  37 // "value_changed"
  38 //-----------------------------------------------------------------------------
  39
  40 static void gtk_scrollbar_callback( GtkWidget *WXUNUSED(widget), wxScrollBar *win )
  41 {
  42     if (g_isIdle) wxapp_install_idle_handler();
  43
  44     if (!win->m_hasVMT) return;
  45     if (g_blockEventsOnDrag) return;
  46
  47     float diff = win->m_adjust->value - win->m_oldPos;
  48     if (fabs(diff) < 0.2) return;
  49     win->m_oldPos = win->m_adjust->value;
  50
  51     wxEventType command = wxEVT_NULL;
  52
  53     float line_step = win->m_adjust->step_increment;
  54     float page_step = win->m_adjust->page_increment;
  55
  56     if (win->IsScrolling())
  57     {
  58         command = wxEVT_SCROLL_THUMBTRACK;
  59     }
  60     else
  61     {
  62         if (fabs(win->m_adjust->value-win->m_adjust->lower) < 0.2) command = wxEVT_SCROLL_BOTTOM;
  63         else if (fabs(win->m_adjust->value-win->m_adjust->upper) < 0.2) command = wxEVT_SCROLL_TOP;
  64         else if (fabs(diff-line_step) < 0.2) command = wxEVT_SCROLL_LINEDOWN;
  65         else if (fabs(diff+line_step) < 0.2) command = wxEVT_SCROLL_LINEUP;
  66         else if (fabs(diff-page_step) < 0.2) command = wxEVT_SCROLL_PAGEDOWN;
  67         else if (fabs(diff+page_step) < 0.2) command = wxEVT_SCROLL_PAGEUP;
  68         else command = wxEVT_SCROLL_THUMBTRACK;
  69     }
  70
  71     int value = (int)(win->m_adjust->value+0.5);
  72
  73     int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
  74
  75     wxScrollEvent event( command, win->GetId(), value, orient );
  76     event.SetEventObject( win );
  77     win->GetEventHandler()->ProcessEvent( event );
  78
  79 /*
  80     wxCommandEvent cevent( wxEVT_COMMAND_SCROLLBAR_UPDATED, win->GetId() );
  81     cevent.SetEventObject( win );
  82     win->ProcessEvent( cevent );
  83 */
  84 }
  85
  86 //-----------------------------------------------------------------------------
  87 // "button_press_event" from slider
  88 //-----------------------------------------------------------------------------
  89
  90 static gint gtk_scrollbar_button_press_callback( GtkRange *WXUNUSED(widget),
  91                                                  GdkEventButton *WXUNUSED(gdk_event),
  92                                                  wxScrollBar *win )
  93 {
  94     if (g_isIdle) wxapp_install_idle_handler();
  95
  96     win->SetScrolling(TRUE);
  97 //  g_blockEventsOnScroll = TRUE;  doesn't work in DialogEd
  98
  99     return FALSE;
 100 }
 101
 102 //-----------------------------------------------------------------------------
 103 // "button_release_event" from slider
 104 //-----------------------------------------------------------------------------
 105
 106 static gint gtk_scrollbar_button_release_callback( GtkRange *WXUNUSED(widget),
 107                                                    GdkEventButton *WXUNUSED(gdk_event),
 108                                                    wxScrollBar *win )
 109 {
 110     if (g_isIdle) wxapp_install_idle_handler();
 111
 112     win->SetScrolling(FALSE);
 113 //  g_blockEventsOnScroll = FALSE;
 114
 115     gtk_signal_emit_by_name( GTK_OBJECT(win->m_adjust), "value_changed" );
 116
 117     return FALSE;
 118 }
 119
 120 //-----------------------------------------------------------------------------
 121 // wxScrollBar
 122 //-----------------------------------------------------------------------------
 123
 124 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
 125
 126 wxScrollBar::~wxScrollBar(void)
 127 {
 128 }
 129
 130 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 131            const wxPoint& pos, const wxSize& size,
 132            long style, const wxValidator& validator, const wxString& name )
 133 {
 134     m_needParent = TRUE;
 135     m_acceptsFocus = TRUE;
 136
 137     PreCreation( parent, id, pos, size, style, name );
 138
 139     SetValidator( validator );
 140
 141     m_oldPos = 0.0;
 142
 143     if (style & wxSB_VERTICAL == wxSB_VERTICAL)
 144         m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 145     else
 146         m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 147
 148     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 149
 150     gtk_signal_connect( GTK_OBJECT(m_adjust),
 151                         "value_changed",
 152                         (GtkSignalFunc) gtk_scrollbar_callback,
 153                         (gpointer) this );
 154
 155     gtk_signal_connect( GTK_OBJECT(m_widget),
 156                         "button_press_event",
 157                         (GtkSignalFunc)gtk_scrollbar_button_press_callback,
 158                         (gpointer) this );
 159
 160     gtk_signal_connect( GTK_OBJECT(m_widget),
 161                         "button_release_event",
 162                         (GtkSignalFunc)gtk_scrollbar_button_release_callback,
 163                         (gpointer) this );
 164
 165     m_parent->DoAddChild( this );
 166
 167     PostCreation();
 168
 169     SetBackgroundColour( parent->GetBackgroundColour() );
 170
 171     Show( TRUE );
 172
 173     return TRUE;
 174 }
 175
 176 int wxScrollBar::GetThumbPosition(void) const
 177 {
 178     return (int)(m_adjust->value+0.5);
 179 }
 180
 181 int wxScrollBar::GetThumbSize() const
 182 {
 183     return (int)(m_adjust->page_size+0.5);
 184 }
 185
 186 int wxScrollBar::GetPageSize() const
 187 {
 188     return (int)(m_adjust->page_increment+0.5);
 189 }
 190
 191 int wxScrollBar::GetRange() const
 192 {
 193     return (int)(m_adjust->upper+0.5);
 194 }
 195
 196 void wxScrollBar::SetThumbPosition( int viewStart )
 197 {
 198     if (m_isScrolling) return;
 199
 200     float fpos = (float)viewStart;
 201     m_oldPos = fpos;
 202     if (fabs(fpos-m_adjust->value) < 0.2) return;
 203     m_adjust->value = fpos;
 204
 205     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 206 }
 207
 208 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 209       bool WXUNUSED(refresh) )
 210 {
 211     float fpos = (float)position;
 212     float frange = (float)range;
 213     float fthumb = (float)thumbSize;
 214     float fpage = (float)pageSize;
 215
 216     if ((fabs(frange-m_adjust->upper) < 0.2) &&
 217         (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 218         (fabs(fpage-m_adjust->page_increment) < 0.2))
 219     {
 220         SetThumbPosition( position );
 221         return;
 222     }
 223
 224     m_oldPos = fpos;
 225
 226     m_adjust->lower = 0.0;
 227     m_adjust->upper = frange;
 228     m_adjust->value = fpos;
 229     m_adjust->step_increment = 1.0;
 230     m_adjust->page_increment = (float)(wxMax(fpage,0));
 231     m_adjust->page_size = fthumb;
 232
 233     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 234 }
 235
 236 /* Backward compatibility */
 237 int wxScrollBar::GetValue(void) const
 238 {
 239     return GetThumbPosition();
 240 }
 241
 242 void wxScrollBar::SetValue( int viewStart )
 243 {
 244     SetThumbPosition( viewStart );
 245 }
 246
 247 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 248 {
 249     int pos = (int)(m_adjust->value+0.5);
 250     int thumb = (int)(m_adjust->page_size+0.5);
 251     int page = (int)(m_adjust->page_increment+0.5);
 252     int range = (int)(m_adjust->upper+0.5);
 253
 254     *viewStart = pos;
 255     *viewLength = range;
 256     *objectLength = thumb;
 257     *pageLength = page;
 258 }
 259
 260 int wxScrollBar::GetViewLength() const
 261 {
 262     return (int)(m_adjust->upper+0.5);
 263 }
 264
 265 int wxScrollBar::GetObjectLength() const
 266 {
 267     return (int)(m_adjust->page_size+0.5);
 268 }
 269
 270 void wxScrollBar::SetPageSize( int pageLength )
 271 {
 272     int pos = (int)(m_adjust->value+0.5);
 273     int thumb = (int)(m_adjust->page_size+0.5);
 274     int range = (int)(m_adjust->upper+0.5);
 275     SetScrollbar( pos, thumb, range, pageLength );
 276 }
 277
 278 void wxScrollBar::SetObjectLength( int objectLength )
 279 {
 280     int pos = (int)(m_adjust->value+0.5);
 281     int page = (int)(m_adjust->page_increment+0.5);
 282     int range = (int)(m_adjust->upper+0.5);
 283     SetScrollbar( pos, objectLength, range, page );
 284 }
 285
 286 void wxScrollBar::SetViewLength( int viewLength )
 287 {
 288     int pos = (int)(m_adjust->value+0.5);
 289     int thumb = (int)(m_adjust->page_size+0.5);
 290     int page = (int)(m_adjust->page_increment+0.5);
 291     SetScrollbar( pos, thumb, viewLength, page );
 292 }
 293
 294 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 295 {
 296     GtkRange *range = GTK_RANGE(m_widget);
 297     return ( (window == GTK_WIDGET(range)->window) ||
 298              (window == range->trough) ||
 299              (window == range->slider) ||
 300              (window == range->step_forw) ||
 301              (window == range->step_back) );
 302 }
 303
 304 void wxScrollBar::ApplyWidgetStyle()
 305 {
 306     SetWidgetStyle();
 307     gtk_widget_set_style( m_widget, m_widgetStyle );
 308 }
 309