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 static void gtk_slider_callback( GtkAdjustment *adjust,
  45                                  SCROLLBAR_CBACK_ARG
  46                                  wxSlider *win )
  47 {
  48     if (g_isIdle) wxapp_install_idle_handler();
  49
  50     if (!win->m_hasVMT) return;
  51     if (g_blockEventsOnDrag) return;
  52
  53     float diff = adjust->value - win->m_oldPos;
  54     if (fabs(diff) < sensitivity) return;
  55
  56     win->m_oldPos = adjust->value;
  57
  58     wxEventType command = GtkScrollTypeToWx(GET_SCROLL_TYPE(win->m_widget));
  59
  60     double dvalue = adjust->value;
  61     int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5);
  62
  63     int orient = win->GetWindowStyleFlag() & wxSL_VERTICAL ? wxVERTICAL
  64                                                            : wxHORIZONTAL;
  65
  66     wxScrollEvent event( command, win->GetId(), value, orient );
  67     event.SetEventObject( win );
  68     win->GetEventHandler()->ProcessEvent( event );
  69
  70     wxCommandEvent cevent( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
  71     cevent.SetEventObject( win );
  72     cevent.SetInt( value );
  73     win->GetEventHandler()->ProcessEvent( cevent );
  74 }
  75
  76 //-----------------------------------------------------------------------------
  77 // wxSlider
  78 //-----------------------------------------------------------------------------
  79
  80 IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
  81
  82 bool wxSlider::Create(wxWindow *parent, wxWindowID id,
  83         int value, int minValue, int maxValue,
  84         const wxPoint& pos, const wxSize& size,
  85         long style, const wxValidator& validator, const wxString& name )
  86 {
  87     m_acceptsFocus = TRUE;
  88     m_needParent = TRUE;
  89
  90     if (!PreCreation( parent, pos, size ) ||
  91         !CreateBase( parent, id, pos, size, style, validator, name ))
  92     {
  93         wxFAIL_MSG( wxT("wxSlider creation failed") );
  94         return FALSE;
  95     }
  96
  97     m_oldPos = 0.0;
  98
  99     if (style & wxSL_VERTICAL)
 100         m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
 101     else
 102         m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
 103
 104     if (style & wxSL_LABELS)
 105     {
 106         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
 107         gtk_scale_set_digits( GTK_SCALE( m_widget ), 0 );
 108
 109         /* labels need more space and too small window will
 110            cause junk to appear on the dialog */
 111         if (style & wxSL_VERTICAL)
 112         {
 113             wxSize sz( size );
 114             if (sz.x < 35)
 115             {
 116                 sz.x = 35;
 117                 SetSize( sz );
 118             }
 119         }
 120         else
 121         {
 122             wxSize sz( size );
 123             if (sz.y < 35)
 124             {
 125                 sz.y = 35;
 126                 SetSize( sz );
 127             }
 128         }
 129     }
 130     else
 131         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 132
 133     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 134
 135 #ifdef __WXGTK20__
 136     if (style & wxSL_INVERSE)
 137         gtk_range_set_inverted( GTK_RANGE(m_widget), TRUE );
 138 #endif
 139
 140     GtkEnableEvents();
 141
 142     SetRange( minValue, maxValue );
 143     SetValue( value );
 144
 145     m_parent->DoAddChild( this );
 146
 147     PostCreation(size);
 148
 149     return TRUE;
 150 }
 151
 152 int wxSlider::GetValue() const
 153 {
 154     // we want to round to the nearest integer, i.e. 0.9 is rounded to 1 and
 155     // -0.9 is rounded to -1
 156     double val = m_adjust->value;
 157     return (int)(val < 0 ? val - 0.5 : val + 0.5);
 158 }
 159
 160 void wxSlider::SetValue( int value )
 161 {
 162     float fpos = (float)value;
 163     m_oldPos = fpos;
 164     if (fabs(fpos-m_adjust->value) < 0.2) return;
 165
 166     m_adjust->value = fpos;
 167
 168     GtkDisableEvents();
 169
 170     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 171
 172     GtkEnableEvents();
 173 }
 174
 175 void wxSlider::SetRange( int minValue, int maxValue )
 176 {
 177     float fmin = (float)minValue;
 178     float fmax = (float)maxValue;
 179
 180     if ((fabs(fmin-m_adjust->lower) < 0.2) &&
 181         (fabs(fmax-m_adjust->upper) < 0.2))
 182     {
 183         return;
 184     }
 185
 186     m_adjust->lower = fmin;
 187     m_adjust->upper = fmax;
 188     m_adjust->step_increment = 1.0;
 189     m_adjust->page_increment = ceil((fmax-fmin) / 10.0);
 190
 191     GtkDisableEvents();
 192
 193     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 194
 195     GtkEnableEvents();
 196 }
 197
 198 int wxSlider::GetMin() const
 199 {
 200     return (int)ceil(m_adjust->lower);
 201 }
 202
 203 int wxSlider::GetMax() const
 204 {
 205     return (int)ceil(m_adjust->upper);
 206 }
 207
 208 void wxSlider::SetPageSize( int pageSize )
 209 {
 210     float fpage = (float)pageSize;
 211
 212     if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
 213
 214     m_adjust->page_increment = fpage;
 215
 216     GtkDisableEvents();
 217
 218     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 219
 220     GtkEnableEvents();
 221 }
 222
 223 int wxSlider::GetPageSize() const
 224 {
 225     return (int)ceil(m_adjust->page_increment);
 226 }
 227
 228 void wxSlider::SetThumbLength( int len )
 229 {
 230     float flen = (float)len;
 231
 232     if (fabs(flen-m_adjust->page_size) < 0.2) return;
 233
 234     m_adjust->page_size = flen;
 235
 236     GtkDisableEvents();
 237
 238     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 239
 240     GtkEnableEvents();
 241 }
 242
 243 int wxSlider::GetThumbLength() const
 244 {
 245     return (int)ceil(m_adjust->page_size);
 246 }
 247
 248 void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
 249 {
 250 }
 251
 252 int wxSlider::GetLineSize() const
 253 {
 254     return 0;
 255 }
 256
 257 bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
 258 {
 259     GtkRange *range = GTK_RANGE(m_widget);
 260 #ifdef __WXGTK20__
 261     return (range->event_window == window);
 262 #else
 263     return ( (window == GTK_WIDGET(range)->window)
 264                 || (window == range->trough)
 265                 || (window == range->slider)
 266                 || (window == range->step_forw)
 267                 || (window == range->step_back) );
 268 #endif
 269 }
 270
 271 void wxSlider::GtkDisableEvents()
 272 {
 273     gtk_signal_disconnect_by_func( GTK_OBJECT(m_adjust),
 274                         GTK_SIGNAL_FUNC(gtk_slider_callback),
 275                         (gpointer) this );
 276 }
 277
 278 void wxSlider::GtkEnableEvents()
 279 {
 280     gtk_signal_connect( GTK_OBJECT (m_adjust),
 281                         "value_changed",
 282                         GTK_SIGNAL_FUNC(gtk_slider_callback),
 283                         (gpointer) this );
 284 }
 285
 286 // static
 287 wxVisualAttributes
 288 wxSlider::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
 289 {
 290     return GetDefaultAttributesFromGTKWidget(gtk_vscale_new);
 291 }
 292
 293 #endif