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