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