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 #include "wx/math.h"
  23 #include "wx/gtk/private.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
  38 static const float sensitivity = 0.02;
  39
  40 //-----------------------------------------------------------------------------
  41 // "value_changed"
  42 //-----------------------------------------------------------------------------
  43
  44 extern "C" {
  45 static void gtk_slider_callback( GtkAdjustment *adjust,
  46                                  SCROLLBAR_CBACK_ARG
  47                                  wxSlider *win )
  48 {
  49     if (g_isIdle) wxapp_install_idle_handler();
  50
  51     if (!win->m_hasVMT) return;
  52     if (g_blockEventsOnDrag) return;
  53
  54     float diff = adjust->value - win->m_oldPos;
  55     if (fabs(diff) < sensitivity) return;
  56
  57     win->m_oldPos = adjust->value;
  58
  59     wxEventType command = GtkScrollTypeToWx(GET_SCROLL_TYPE(win->m_widget));
  60
  61     double dvalue = adjust->value;
  62     int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5);
  63
  64     int orient = win->GetWindowStyleFlag() & wxSL_VERTICAL ? wxVERTICAL
  65                                                            : wxHORIZONTAL;
  66
  67     wxScrollEvent event( command, win->GetId(), value, orient );
  68     event.SetEventObject( win );
  69     win->GetEventHandler()->ProcessEvent( event );
  70
  71     wxCommandEvent cevent( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
  72     cevent.SetEventObject( win );
  73     cevent.SetInt( value );
  74     win->GetEventHandler()->ProcessEvent( cevent );
  75 }
  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 #ifdef __WXGTK20__
 138     if (style & wxSL_INVERSE)
 139         gtk_range_set_inverted( GTK_RANGE(m_widget), TRUE );
 140 #endif
 141
 142     GtkEnableEvents();
 143
 144     SetRange( minValue, maxValue );
 145     SetValue( value );
 146
 147     m_parent->DoAddChild( this );
 148
 149     PostCreation(size);
 150
 151     return TRUE;
 152 }
 153
 154 int wxSlider::GetValue() const
 155 {
 156     // we want to round to the nearest integer, i.e. 0.9 is rounded to 1 and
 157     // -0.9 is rounded to -1
 158     double val = m_adjust->value;
 159     return (int)(val < 0 ? val - 0.5 : val + 0.5);
 160 }
 161
 162 void wxSlider::SetValue( int value )
 163 {
 164     float fpos = (float)value;
 165     m_oldPos = fpos;
 166     if (fabs(fpos-m_adjust->value) < 0.2) return;
 167
 168     m_adjust->value = fpos;
 169
 170     GtkDisableEvents();
 171
 172     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 173
 174     GtkEnableEvents();
 175 }
 176
 177 void wxSlider::SetRange( int minValue, int maxValue )
 178 {
 179     float fmin = (float)minValue;
 180     float fmax = (float)maxValue;
 181
 182     if ((fabs(fmin-m_adjust->lower) < 0.2) &&
 183         (fabs(fmax-m_adjust->upper) < 0.2))
 184     {
 185         return;
 186     }
 187
 188     m_adjust->lower = fmin;
 189     m_adjust->upper = fmax;
 190     m_adjust->step_increment = 1.0;
 191     m_adjust->page_increment = ceil((fmax-fmin) / 10.0);
 192
 193     GtkDisableEvents();
 194
 195     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 196
 197     GtkEnableEvents();
 198 }
 199
 200 int wxSlider::GetMin() const
 201 {
 202     return (int)ceil(m_adjust->lower);
 203 }
 204
 205 int wxSlider::GetMax() const
 206 {
 207     return (int)ceil(m_adjust->upper);
 208 }
 209
 210 void wxSlider::SetPageSize( int pageSize )
 211 {
 212     float fpage = (float)pageSize;
 213
 214     if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
 215
 216     m_adjust->page_increment = fpage;
 217
 218     GtkDisableEvents();
 219
 220     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 221
 222     GtkEnableEvents();
 223 }
 224
 225 int wxSlider::GetPageSize() const
 226 {
 227     return (int)ceil(m_adjust->page_increment);
 228 }
 229
 230 void wxSlider::SetThumbLength( int len )
 231 {
 232     float flen = (float)len;
 233
 234     if (fabs(flen-m_adjust->page_size) < 0.2) return;
 235
 236     m_adjust->page_size = flen;
 237
 238     GtkDisableEvents();
 239
 240     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 241
 242     GtkEnableEvents();
 243 }
 244
 245 int wxSlider::GetThumbLength() const
 246 {
 247     return (int)ceil(m_adjust->page_size);
 248 }
 249
 250 void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
 251 {
 252 }
 253
 254 int wxSlider::GetLineSize() const
 255 {
 256     return 0;
 257 }
 258
 259 bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
 260 {
 261     GtkRange *range = GTK_RANGE(m_widget);
 262 #ifdef __WXGTK20__
 263     return (range->event_window == window);
 264 #else
 265     return ( (window == GTK_WIDGET(range)->window)
 266                 || (window == range->trough)
 267                 || (window == range->slider)
 268                 || (window == range->step_forw)
 269                 || (window == range->step_back) );
 270 #endif
 271 }
 272
 273 void wxSlider::GtkDisableEvents()
 274 {
 275     gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust),
 276                         GTK_SIGNAL_FUNC(gtk_slider_callback),
 277                         (gpointer) this );
 278 }
 279
 280 void wxSlider::GtkEnableEvents()
 281 {
 282     gtk_signal_connect( GTK_OBJECT (m_adjust),
 283                         "value_changed",
 284                         GTK_SIGNAL_FUNC(gtk_slider_callback),
 285                         (gpointer) this );
 286 }
 287
 288 // static
 289 wxVisualAttributes
 290 wxSlider::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 291 {
 292     return GetDefaultAttributesFromGTKWidget(gtk_vscale_new);
 293 }
 294
 295 #endif