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 #include <math.h>
  21
  22 #include "gdk/gdk.h"
  23 #include "gtk/gtk.h"
  24
  25 //-----------------------------------------------------------------------------
  26 // idle system
  27 //-----------------------------------------------------------------------------
  28
  29 extern void wxapp_install_idle_handler();
  30 extern bool g_isIdle;
  31
  32 //-----------------------------------------------------------------------------
  33 // data
  34 //-----------------------------------------------------------------------------
  35
  36 extern bool   g_blockEventsOnDrag;
  37 extern bool   g_blockEventsOnScroll;
  38
  39 //-----------------------------------------------------------------------------
  40 // "value_changed"
  41 //-----------------------------------------------------------------------------
  42
  43 static void gtk_scrollbar_callback( GtkAdjustment *adjust, wxScrollBar *win )
  44 {
  45     if (g_isIdle) wxapp_install_idle_handler();
  46
  47     if (!win->m_hasVMT) return;
  48     if (g_blockEventsOnDrag) return;
  49
  50     float diff = adjust->value - win->m_oldPos;
  51     if (fabs(diff) < 0.2) return;
  52
  53     win->m_oldPos = adjust->value;
  54
  55     GtkRange *range = GTK_RANGE( win->m_widget );
  56
  57     wxEventType command = wxEVT_SCROLL_THUMBTRACK;
  58     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLL_LINEUP;
  59     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLL_LINEDOWN;
  60     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLL_PAGEUP;
  61     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLL_PAGEDOWN;
  62
  63     int value = (int)ceil(adjust->value);
  64
  65     int orient = win->HasFlag(wxSB_VERTICAL) ? wxVERTICAL : wxHORIZONTAL;
  66
  67     wxScrollEvent event( command, win->GetId(), value, orient );
  68     event.SetEventObject( win );
  69     win->GetEventHandler()->ProcessEvent( event );
  70
  71 /*
  72     wxCommandEvent cevent( wxEVT_COMMAND_SCROLLBAR_UPDATED, win->GetId() );
  73     cevent.SetEventObject( win );
  74     win->ProcessEvent( cevent );
  75 */
  76 }
  77
  78 //-----------------------------------------------------------------------------
  79 // "button_press_event" from slider
  80 //-----------------------------------------------------------------------------
  81
  82 static gint gtk_scrollbar_button_press_callback( GtkRange *WXUNUSED(widget),
  83                                                  GdkEventButton *WXUNUSED(gdk_event),
  84                                                  wxScrollBar *win )
  85 {
  86     if (g_isIdle) wxapp_install_idle_handler();
  87
  88     win->SetScrolling(TRUE);
  89 //  g_blockEventsOnScroll = TRUE;  doesn't work in DialogEd
  90
  91     return FALSE;
  92 }
  93
  94 //-----------------------------------------------------------------------------
  95 // "button_release_event" from slider
  96 //-----------------------------------------------------------------------------
  97
  98 static gint gtk_scrollbar_button_release_callback( GtkRange *WXUNUSED(widget),
  99                                                    GdkEventButton *WXUNUSED(gdk_event),
 100                                                    wxScrollBar *win )
 101 {
 102     if (g_isIdle) wxapp_install_idle_handler();
 103
 104     win->SetScrolling(FALSE);
 105 //  g_blockEventsOnScroll = FALSE;
 106
 107     gtk_signal_emit_by_name( GTK_OBJECT(win->m_adjust), "value_changed" );
 108
 109     return FALSE;
 110 }
 111
 112 //-----------------------------------------------------------------------------
 113 // wxScrollBar
 114 //-----------------------------------------------------------------------------
 115
 116 IMPLEMENT_DYNAMIC_CLASS(wxScrollBar,wxControl)
 117
 118 wxScrollBar::~wxScrollBar(void)
 119 {
 120 }
 121
 122 bool wxScrollBar::Create(wxWindow *parent, wxWindowID id,
 123            const wxPoint& pos, const wxSize& size,
 124            long style, const wxValidator& validator, const wxString& name )
 125 {
 126     m_needParent = TRUE;
 127     m_acceptsFocus = TRUE;
 128
 129     if (!PreCreation( parent, pos, size ) ||
 130         !CreateBase( parent, id, pos, size, style, validator, name ))
 131     {
 132         wxFAIL_MSG( wxT("wxScrollBar creation failed") );
 133         return FALSE;
 134     }
 135
 136     m_oldPos = 0.0;
 137
 138     if ((style & wxSB_VERTICAL) == wxSB_VERTICAL)
 139         m_widget = gtk_vscrollbar_new( (GtkAdjustment *) NULL );
 140     else
 141         m_widget = gtk_hscrollbar_new( (GtkAdjustment *) NULL );
 142
 143     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 144
 145     gtk_signal_connect( GTK_OBJECT(m_adjust),
 146                         "value_changed",
 147                         (GtkSignalFunc) gtk_scrollbar_callback,
 148                         (gpointer) this );
 149
 150     gtk_signal_connect( GTK_OBJECT(m_widget),
 151                         "button_press_event",
 152                         (GtkSignalFunc)gtk_scrollbar_button_press_callback,
 153                         (gpointer) this );
 154
 155     gtk_signal_connect( GTK_OBJECT(m_widget),
 156                         "button_release_event",
 157                         (GtkSignalFunc)gtk_scrollbar_button_release_callback,
 158                         (gpointer) this );
 159
 160     m_parent->DoAddChild( this );
 161
 162     PostCreation();
 163
 164     SetBackgroundColour( parent->GetBackgroundColour() );
 165
 166     Show( TRUE );
 167
 168     return TRUE;
 169 }
 170
 171 int wxScrollBar::GetThumbPosition(void) const
 172 {
 173     return (int)(m_adjust->value+0.5);
 174 }
 175
 176 int wxScrollBar::GetThumbSize() const
 177 {
 178     return (int)(m_adjust->page_size+0.5);
 179 }
 180
 181 int wxScrollBar::GetPageSize() const
 182 {
 183     return (int)(m_adjust->page_increment+0.5);
 184 }
 185
 186 int wxScrollBar::GetRange() const
 187 {
 188     return (int)(m_adjust->upper+0.5);
 189 }
 190
 191 void wxScrollBar::SetThumbPosition( int viewStart )
 192 {
 193     if (m_isScrolling) return;
 194
 195     float fpos = (float)viewStart;
 196     m_oldPos = fpos;
 197     if (fabs(fpos-m_adjust->value) < 0.2) return;
 198     m_adjust->value = fpos;
 199
 200     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 201 }
 202
 203 void wxScrollBar::SetScrollbar( int position, int thumbSize, int range, int pageSize,
 204       bool WXUNUSED(refresh) )
 205 {
 206     float fpos = (float)position;
 207     float frange = (float)range;
 208     float fthumb = (float)thumbSize;
 209     float fpage = (float)pageSize;
 210
 211     if ((fabs(frange-m_adjust->upper) < 0.2) &&
 212         (fabs(fthumb-m_adjust->page_size) < 0.2) &&
 213         (fabs(fpage-m_adjust->page_increment) < 0.2))
 214     {
 215         SetThumbPosition( position );
 216         return;
 217     }
 218
 219     m_oldPos = fpos;
 220
 221     m_adjust->lower = 0.0;
 222     m_adjust->upper = frange;
 223     m_adjust->value = fpos;
 224     m_adjust->step_increment = 1.0;
 225     m_adjust->page_increment = (float)(wxMax(fpage,0));
 226     m_adjust->page_size = fthumb;
 227
 228     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 229 }
 230
 231 /* Backward compatibility */
 232 int wxScrollBar::GetValue(void) const
 233 {
 234     return GetThumbPosition();
 235 }
 236
 237 void wxScrollBar::SetValue( int viewStart )
 238 {
 239     SetThumbPosition( viewStart );
 240 }
 241
 242 void wxScrollBar::GetValues( int *viewStart, int *viewLength, int *objectLength, int *pageLength ) const
 243 {
 244     int pos = (int)(m_adjust->value+0.5);
 245     int thumb = (int)(m_adjust->page_size+0.5);
 246     int page = (int)(m_adjust->page_increment+0.5);
 247     int range = (int)(m_adjust->upper+0.5);
 248
 249     *viewStart = pos;
 250     *viewLength = range;
 251     *objectLength = thumb;
 252     *pageLength = page;
 253 }
 254
 255 int wxScrollBar::GetViewLength() const
 256 {
 257     return (int)(m_adjust->upper+0.5);
 258 }
 259
 260 int wxScrollBar::GetObjectLength() const
 261 {
 262     return (int)(m_adjust->page_size+0.5);
 263 }
 264
 265 void wxScrollBar::SetPageSize( int pageLength )
 266 {
 267     int pos = (int)(m_adjust->value+0.5);
 268     int thumb = (int)(m_adjust->page_size+0.5);
 269     int range = (int)(m_adjust->upper+0.5);
 270     SetScrollbar( pos, thumb, range, pageLength );
 271 }
 272
 273 void wxScrollBar::SetObjectLength( int objectLength )
 274 {
 275     int pos = (int)(m_adjust->value+0.5);
 276     int page = (int)(m_adjust->page_increment+0.5);
 277     int range = (int)(m_adjust->upper+0.5);
 278     SetScrollbar( pos, objectLength, range, page );
 279 }
 280
 281 void wxScrollBar::SetViewLength( int viewLength )
 282 {
 283     int pos = (int)(m_adjust->value+0.5);
 284     int thumb = (int)(m_adjust->page_size+0.5);
 285     int page = (int)(m_adjust->page_increment+0.5);
 286     SetScrollbar( pos, thumb, viewLength, page );
 287 }
 288
 289 bool wxScrollBar::IsOwnGtkWindow( GdkWindow *window )
 290 {
 291     GtkRange *range = GTK_RANGE(m_widget);
 292     return ( (window == GTK_WIDGET(range)->window) ||
 293              (window == range->trough) ||
 294              (window == range->slider) ||
 295              (window == range->step_forw) ||
 296              (window == range->step_back) );
 297 }
 298
 299 void wxScrollBar::ApplyWidgetStyle()
 300 {
 301     SetWidgetStyle();
 302     gtk_widget_set_style( m_widget, m_widgetStyle );
 303 }
 304
 305 #endif