src/gtk/slider.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/slider.cpp
   3 // Purpose:
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11 #pragma implementation "slider.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #include "wx/slider.h"
  18
  19 #if wxUSE_SLIDER
  20
  21 #include "wx/utils.h"
  22
  23 #include <math.h>
  24
  25 #include "wx/gtk/private.h"
  26
  27 //-----------------------------------------------------------------------------
  28 // idle system
  29 //-----------------------------------------------------------------------------
  30
  31 extern void wxapp_install_idle_handler();
  32 extern bool g_isIdle;
  33
  34 //-----------------------------------------------------------------------------
  35 // data
  36 //-----------------------------------------------------------------------------
  37
  38 extern bool g_blockEventsOnDrag;
  39
  40 static const float sensitivity = 0.02;
  41
  42 //-----------------------------------------------------------------------------
  43 // "value_changed"
  44 //-----------------------------------------------------------------------------
  45
  46 static void gtk_slider_callback( GtkAdjustment *adjust,
  47                                  SCROLLBAR_CBACK_ARG
  48                                  wxSlider *win )
  49 {
  50     if (g_isIdle) wxapp_install_idle_handler();
  51
  52     if (!win->m_hasVMT) return;
  53     if (g_blockEventsOnDrag) return;
  54
  55     float diff = adjust->value - win->m_oldPos;
  56     if (fabs(diff) < sensitivity) return;
  57
  58     win->m_oldPos = adjust->value;
  59
  60     wxEventType command = GtkScrollTypeToWx(GET_SCROLL_TYPE(win->m_widget));
  61
  62     double dvalue = adjust->value;
  63     int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5);
  64
  65     int orient = win->GetWindowStyleFlag() & wxSL_VERTICAL ? wxVERTICAL
  66                                                            : wxHORIZONTAL;
  67
  68     wxScrollEvent event( command, win->GetId(), value, orient );
  69     event.SetEventObject( win );
  70     win->GetEventHandler()->ProcessEvent( event );
  71
  72     wxCommandEvent cevent( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
  73     cevent.SetEventObject( win );
  74     cevent.SetInt( value );
  75     win->GetEventHandler()->ProcessEvent( cevent );
  76 }
  77
  78 //-----------------------------------------------------------------------------
  79 // wxSlider
  80 //-----------------------------------------------------------------------------
  81
  82 IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
  83
  84 bool wxSlider::Create(wxWindow *parent, wxWindowID id,
  85         int value, int minValue, int maxValue,
  86         const wxPoint& pos, const wxSize& size,
  87         long style, const wxValidator& validator, const wxString& name )
  88 {
  89     m_acceptsFocus = TRUE;
  90     m_needParent = TRUE;
  91
  92     if (!PreCreation( parent, pos, size ) ||
  93         !CreateBase( parent, id, pos, size, style, validator, name ))
  94     {
  95         wxFAIL_MSG( wxT("wxSlider creation failed") );
  96         return FALSE;
  97     }
  98
  99     m_oldPos = 0.0;
 100
 101     if (style & wxSL_VERTICAL)
 102         m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
 103     else
 104         m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
 105
 106     if (style & wxSL_LABELS)
 107     {
 108         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
 109         gtk_scale_set_digits( GTK_SCALE( m_widget ), 0 );
 110
 111         /* labels need more space and too small window will
 112            cause junk to appear on the dialog */
 113         if (style & wxSL_VERTICAL)
 114         {
 115             wxSize sz( size );
 116             if (sz.x < 35)
 117             {
 118                 sz.x = 35;
 119                 SetSize( sz );
 120             }
 121         }
 122         else
 123         {
 124             wxSize sz( size );
 125             if (sz.y < 35)
 126             {
 127                 sz.y = 35;
 128                 SetSize( sz );
 129             }
 130         }
 131     }
 132     else
 133         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 134
 135     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 136
 137     GtkEnableEvents();
 138
 139     SetRange( minValue, maxValue );
 140     SetValue( value );
 141
 142     m_parent->DoAddChild( this );
 143
 144     PostCreation(size);
 145
 146     return TRUE;
 147 }
 148
 149 int wxSlider::GetValue() const
 150 {
 151     // we want to round to the nearest integer, i.e. 0.9 is rounded to 1 and
 152     // -0.9 is rounded to -1
 153     double val = m_adjust->value;
 154     return (int)(val < 0 ? val - 0.5 : val + 0.5);
 155 }
 156
 157 void wxSlider::SetValue( int value )
 158 {
 159     float fpos = (float)value;
 160     m_oldPos = fpos;
 161     if (fabs(fpos-m_adjust->value) < 0.2) return;
 162
 163     m_adjust->value = fpos;
 164
 165     GtkDisableEvents();
 166
 167     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 168
 169     GtkEnableEvents();
 170 }
 171
 172 void wxSlider::SetRange( int minValue, int maxValue )
 173 {
 174     float fmin = (float)minValue;
 175     float fmax = (float)maxValue;
 176
 177     if ((fabs(fmin-m_adjust->lower) < 0.2) &&
 178         (fabs(fmax-m_adjust->upper) < 0.2))
 179     {
 180         return;
 181     }
 182
 183     m_adjust->lower = fmin;
 184     m_adjust->upper = fmax;
 185     m_adjust->step_increment = 1.0;
 186     m_adjust->page_increment = ceil((fmax-fmin) / 10.0);
 187
 188     GtkDisableEvents();
 189
 190     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 191
 192     GtkEnableEvents();
 193 }
 194
 195 int wxSlider::GetMin() const
 196 {
 197     return (int)ceil(m_adjust->lower);
 198 }
 199
 200 int wxSlider::GetMax() const
 201 {
 202     return (int)ceil(m_adjust->upper);
 203 }
 204
 205 void wxSlider::SetPageSize( int pageSize )
 206 {
 207     float fpage = (float)pageSize;
 208
 209     if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
 210
 211     m_adjust->page_increment = fpage;
 212
 213     GtkDisableEvents();
 214
 215     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 216
 217     GtkEnableEvents();
 218 }
 219
 220 int wxSlider::GetPageSize() const
 221 {
 222     return (int)ceil(m_adjust->page_increment);
 223 }
 224
 225 void wxSlider::SetThumbLength( int len )
 226 {
 227     float flen = (float)len;
 228
 229     if (fabs(flen-m_adjust->page_size) < 0.2) return;
 230
 231     m_adjust->page_size = flen;
 232
 233     GtkDisableEvents();
 234
 235     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 236
 237     GtkEnableEvents();
 238 }
 239
 240 int wxSlider::GetThumbLength() const
 241 {
 242     return (int)ceil(m_adjust->page_size);
 243 }
 244
 245 void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
 246 {
 247 }
 248
 249 int wxSlider::GetLineSize() const
 250 {
 251     return 0;
 252 }
 253
 254 bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
 255 {
 256     GtkRange *range = GTK_RANGE(m_widget);
 257 #ifdef __WXGTK20__
 258     return (range->event_window == window);
 259 #else
 260     return ( (window == GTK_WIDGET(range)->window)
 261                 || (window == range->trough)
 262                 || (window == range->slider)
 263                 || (window == range->step_forw)
 264                 || (window == range->step_back) );
 265 #endif
 266 }
 267
 268 void wxSlider::GtkDisableEvents()
 269 {
 270     gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust),
 271                         GTK_SIGNAL_FUNC(gtk_slider_callback),
 272                         (gpointer) this );
 273 }
 274
 275 void wxSlider::GtkEnableEvents()
 276 {
 277     gtk_signal_connect( GTK_OBJECT (m_adjust),
 278                         "value_changed",
 279                         GTK_SIGNAL_FUNC(gtk_slider_callback),
 280                         (gpointer) this );
 281 }
 282
 283 // static
 284 wxVisualAttributes
 285 wxSlider::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 286 {
 287     return GetDefaultAttributesFromGTKWidget(gtk_vscale_new);
 288 }
 289
 290 #endif