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 <gdk/gdk.h>
  23 #include <gtk/gtk.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, wxSlider *win )
  45 {
  46     if (g_isIdle) wxapp_install_idle_handler();
  47
  48     if (!win->m_hasVMT) return;
  49     if (g_blockEventsOnDrag) return;
  50
  51     float diff = adjust->value - win->m_oldPos;
  52     if (fabs(diff) < sensitivity) return;
  53
  54     win->m_oldPos = adjust->value;
  55
  56     GtkRange *range = GTK_RANGE( win->m_widget );
  57
  58     wxEventType command = wxEVT_SCROLL_THUMBTRACK;
  59     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLL_LINEUP;
  60     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLL_LINEDOWN;
  61     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLL_PAGEUP;
  62     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLL_PAGEDOWN;
  63
  64     double dvalue = adjust->value;
  65     int value = (int)(dvalue < 0 ? dvalue - 0.5 : dvalue + 0.5);
  66
  67     int orient = win->GetWindowStyleFlag() & wxSL_VERTICAL ? wxVERTICAL
  68                                                            : wxHORIZONTAL;
  69
  70     wxScrollEvent event( command, win->GetId(), value, orient );
  71     event.SetEventObject( win );
  72     win->GetEventHandler()->ProcessEvent( event );
  73
  74     wxCommandEvent cevent( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
  75     cevent.SetEventObject( win );
  76     cevent.SetInt( value );
  77     win->GetEventHandler()->ProcessEvent( cevent );
  78 }
  79
  80 //-----------------------------------------------------------------------------
  81 // wxSlider
  82 //-----------------------------------------------------------------------------
  83
  84 IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
  85
  86 bool wxSlider::Create(wxWindow *parent, wxWindowID id,
  87         int value, int minValue, int maxValue,
  88         const wxPoint& pos, const wxSize& size,
  89         long style, const wxValidator& validator, const wxString& name )
  90 {
  91     m_acceptsFocus = TRUE;
  92     m_needParent = TRUE;
  93
  94     if (!PreCreation( parent, pos, size ) ||
  95         !CreateBase( parent, id, pos, size, style, validator, name ))
  96     {
  97         wxFAIL_MSG( wxT("wxSlider creation failed") );
  98         return FALSE;
  99     }
 100
 101     m_oldPos = 0.0;
 102
 103     if (style & wxSL_VERTICAL)
 104         m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
 105     else
 106         m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
 107
 108     if (style & wxSL_LABELS)
 109     {
 110         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
 111         gtk_scale_set_digits( GTK_SCALE( m_widget ), 0 );
 112
 113         /* labels need more space and too small window will
 114            cause junk to appear on the dialog */
 115         if (style & wxSL_VERTICAL)
 116         {
 117             wxSize sz( size );
 118             if (sz.x < 35)
 119             {
 120                 sz.x = 35;
 121                 SetSize( sz );
 122             }
 123         }
 124         else
 125         {
 126             wxSize sz( size );
 127             if (sz.y < 35)
 128             {
 129                 sz.y = 35;
 130                 SetSize( sz );
 131             }
 132         }
 133     }
 134     else
 135         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 136
 137     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 138
 139     gtk_signal_connect( GTK_OBJECT(m_adjust),
 140                         "value_changed",
 141                         (GtkSignalFunc) gtk_slider_callback,
 142                         (gpointer) this );
 143
 144     SetRange( minValue, maxValue );
 145     SetValue( value );
 146
 147     m_parent->DoAddChild( this );
 148
 149     PostCreation();
 150
 151     SetBackgroundColour( parent->GetBackgroundColour() );
 152
 153     Show( TRUE );
 154
 155     return TRUE;
 156 }
 157
 158 int wxSlider::GetValue() const
 159 {
 160     // we want to round to the nearest integer, i.e. 0.9 is rounded to 1 and
 161     // -0.9 is rounded to -1
 162     double val = m_adjust->value;
 163     return (int)(val < 0 ? val - 0.5 : val + 0.5);
 164 }
 165
 166 void wxSlider::SetValue( int value )
 167 {
 168     float fpos = (float)value;
 169     m_oldPos = fpos;
 170     if (fabs(fpos-m_adjust->value) < 0.2) return;
 171
 172     m_adjust->value = fpos;
 173
 174     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 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     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 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     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 215 }
 216
 217 int wxSlider::GetPageSize() const
 218 {
 219     return (int)ceil(m_adjust->page_increment);
 220 }
 221
 222 void wxSlider::SetThumbLength( int len )
 223 {
 224     float flen = (float)len;
 225
 226     if (fabs(flen-m_adjust->page_size) < 0.2) return;
 227
 228     m_adjust->page_size = flen;
 229
 230     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 231 }
 232
 233 int wxSlider::GetThumbLength() const
 234 {
 235     return (int)ceil(m_adjust->page_size);
 236 }
 237
 238 void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
 239 {
 240 }
 241
 242 int wxSlider::GetLineSize() const
 243 {
 244     return 0;
 245 }
 246
 247 bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
 248 {
 249     GtkRange *range = GTK_RANGE(m_widget);
 250     return ( (window == GTK_WIDGET(range)->window) ||
 251              (window == range->trough) ||
 252              (window == range->slider) ||
 253              (window == range->step_forw) ||
 254              (window == range->step_back) );
 255 }
 256
 257 void wxSlider::ApplyWidgetStyle()
 258 {
 259     SetWidgetStyle();
 260     gtk_widget_set_style( m_widget, m_widgetStyle );
 261 }
 262
 263 #endif