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 #ifdef __GNUG__
  11 #pragma implementation "slider.h"
  12 #endif
  13
  14 #include "wx/slider.h"
  15
  16 #if wxUSE_SLIDER
  17
  18 #include "wx/utils.h"
  19
  20 #include <math.h>
  21
  22 #include "wx/gtk/private.h"
  23
  24 //-----------------------------------------------------------------------------
  25 // idle system
  26 //-----------------------------------------------------------------------------
  27
  28 extern void wxapp_install_idle_handler();
  29 extern bool g_isIdle;
  30
  31 //-----------------------------------------------------------------------------
  32 // data
  33 //-----------------------------------------------------------------------------
  34
  35 extern bool g_blockEventsOnDrag;
  36
  37 static const float sensitivity = 0.02;
  38
  39 //-----------------------------------------------------------------------------
  40 // "value_changed"
  41 //-----------------------------------------------------------------------------
  42
  43 static void gtk_slider_callback( GtkAdjustment *adjust,
  44                                  SCROLLBAR_CBACK_ARG
  45                                  wxSlider *win )
  46 {
  47     if (g_isIdle) wxapp_install_idle_handler();
  48
  49     if (!win->m_hasVMT) return;
  50     if (g_blockEventsOnDrag) return;
  51
  52     float diff = adjust->value - win->m_oldPos;
  53     if (fabs(diff) < sensitivity) return;
  54
  55     win->m_oldPos = adjust->value;
  56
  57     wxEventType command = GtkScrollTypeToWx(GET_SCROLL_TYPE(win->m_widget));
  58
  59     double dvalue = adjust->value;
  60     int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5);
  61
  62     int orient = win->GetWindowStyleFlag() & wxSL_VERTICAL ? wxVERTICAL
  63                                                            : wxHORIZONTAL;
  64
  65     wxScrollEvent event( command, win->GetId(), value, orient );
  66     event.SetEventObject( win );
  67     win->GetEventHandler()->ProcessEvent( event );
  68
  69     wxCommandEvent cevent( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
  70     cevent.SetEventObject( win );
  71     cevent.SetInt( value );
  72     win->GetEventHandler()->ProcessEvent( cevent );
  73 }
  74
  75 //-----------------------------------------------------------------------------
  76 // wxSlider
  77 //-----------------------------------------------------------------------------
  78
  79 IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
  80
  81 bool wxSlider::Create(wxWindow *parent, wxWindowID id,
  82         int value, int minValue, int maxValue,
  83         const wxPoint& pos, const wxSize& size,
  84         long style, const wxValidator& validator, const wxString& name )
  85 {
  86     m_acceptsFocus = TRUE;
  87     m_needParent = TRUE;
  88
  89     if (!PreCreation( parent, pos, size ) ||
  90         !CreateBase( parent, id, pos, size, style, validator, name ))
  91     {
  92         wxFAIL_MSG( wxT("wxSlider creation failed") );
  93         return FALSE;
  94     }
  95
  96     m_oldPos = 0.0;
  97
  98     if (style & wxSL_VERTICAL)
  99         m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
 100     else
 101         m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
 102
 103     if (style & wxSL_LABELS)
 104     {
 105         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
 106         gtk_scale_set_digits( GTK_SCALE( m_widget ), 0 );
 107
 108         /* labels need more space and too small window will
 109            cause junk to appear on the dialog */
 110         if (style & wxSL_VERTICAL)
 111         {
 112             wxSize sz( size );
 113             if (sz.x < 35)
 114             {
 115                 sz.x = 35;
 116                 SetSize( sz );
 117             }
 118         }
 119         else
 120         {
 121             wxSize sz( size );
 122             if (sz.y < 35)
 123             {
 124                 sz.y = 35;
 125                 SetSize( sz );
 126             }
 127         }
 128     }
 129     else
 130         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 131
 132     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 133
 134     GtkEnableEvents();
 135
 136     SetRange( minValue, maxValue );
 137     SetValue( value );
 138
 139     m_parent->DoAddChild( this );
 140
 141     PostCreation();
 142
 143     SetBackgroundColour( parent->GetBackgroundColour() );
 144
 145     Show( TRUE );
 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::ApplyWidgetStyle()
 270 {
 271     SetWidgetStyle();
 272     gtk_widget_set_style( m_widget, m_widgetStyle );
 273 }
 274
 275 void wxSlider::GtkDisableEvents()
 276 {
 277     gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust),
 278                         GTK_SIGNAL_FUNC(gtk_slider_callback),
 279                         (gpointer) this );
 280 }
 281
 282 void wxSlider::GtkEnableEvents()
 283 {
 284     gtk_signal_connect( GTK_OBJECT (m_adjust),
 285                         "value_changed",
 286                         GTK_SIGNAL_FUNC(gtk_slider_callback),
 287                         (gpointer) this );
 288 }
 289
 290 #endif