src/gtk/slider.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 = wxHORIZONTAL;
  68     if ( (win->GetWindowStyleFlag() & wxSB_VERTICAL) == wxSB_VERTICAL)
  69         orient = wxVERTICAL;
  70
  71     wxScrollEvent event( command, win->GetId(), value, orient );
  72     event.SetEventObject( win );
  73     win->GetEventHandler()->ProcessEvent( event );
  74
  75     wxCommandEvent cevent( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
  76     cevent.SetEventObject( win );
  77     cevent.SetInt( value );
  78     win->GetEventHandler()->ProcessEvent( cevent );
  79 }
  80
  81 //-----------------------------------------------------------------------------
  82 // wxSlider
  83 //-----------------------------------------------------------------------------
  84
  85 IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
  86
  87 bool wxSlider::Create(wxWindow *parent, wxWindowID id,
  88         int value, int minValue, int maxValue,
  89         const wxPoint& pos, const wxSize& size,
  90         long style, const wxValidator& validator, const wxString& name )
  91 {
  92     m_acceptsFocus = TRUE;
  93     m_needParent = TRUE;
  94
  95     if (!PreCreation( parent, pos, size ) ||
  96         !CreateBase( parent, id, pos, size, style, validator, name ))
  97     {
  98         wxFAIL_MSG( wxT("wxSlider creation failed") );
  99         return FALSE;
 100     }
 101
 102     m_oldPos = 0.0;
 103
 104     if (style & wxSL_VERTICAL)
 105         m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
 106     else
 107         m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
 108
 109     if (style & wxSL_LABELS)
 110     {
 111         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
 112         gtk_scale_set_digits( GTK_SCALE( m_widget ), 0 );
 113
 114         /* labels need more space and too small window will
 115            cause junk to appear on the dialog */
 116         if (style & wxSL_VERTICAL)
 117         {
 118             wxSize sz( size );
 119             if (sz.x < 35)
 120             {
 121                 sz.x = 35;
 122                 SetSize( sz );
 123             }
 124         }
 125         else
 126         {
 127             wxSize sz( size );
 128             if (sz.y < 35)
 129             {
 130                 sz.y = 35;
 131                 SetSize( sz );
 132             }
 133         }
 134     }
 135     else
 136         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 137
 138     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 139
 140     gtk_signal_connect( GTK_OBJECT(m_adjust),
 141                         "value_changed",
 142                         (GtkSignalFunc) gtk_slider_callback,
 143                         (gpointer) this );
 144
 145     SetRange( minValue, maxValue );
 146     SetValue( value );
 147
 148     m_parent->DoAddChild( this );
 149
 150     PostCreation();
 151
 152     SetBackgroundColour( parent->GetBackgroundColour() );
 153
 154     Show( TRUE );
 155
 156     return TRUE;
 157 }
 158
 159 int wxSlider::GetValue() const
 160 {
 161     // we want to round to the nearest integer, i.e. 0.9 is rounded to 1 and
 162     // -0.9 is rounded to -1
 163     double val = m_adjust->value;
 164     return (int)(val >= 0 ? val - 0.5 : val + 0.5);
 165 }
 166
 167 void wxSlider::SetValue( int value )
 168 {
 169     float fpos = (float)value;
 170     m_oldPos = fpos;
 171     if (fabs(fpos-m_adjust->value) < 0.2) return;
 172
 173     m_adjust->value = fpos;
 174
 175     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 176 }
 177
 178 void wxSlider::SetRange( int minValue, int maxValue )
 179 {
 180     float fmin = (float)minValue;
 181     float fmax = (float)maxValue;
 182
 183     if ((fabs(fmin-m_adjust->lower) < 0.2) &&
 184         (fabs(fmax-m_adjust->upper) < 0.2))
 185     {
 186         return;
 187     }
 188
 189     m_adjust->lower = fmin;
 190     m_adjust->upper = fmax;
 191     m_adjust->step_increment = 1.0;
 192     m_adjust->page_increment = ceil((fmax-fmin) / 10.0);
 193
 194     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 195 }
 196
 197 int wxSlider::GetMin() const
 198 {
 199     return (int)ceil(m_adjust->lower);
 200 }
 201
 202 int wxSlider::GetMax() const
 203 {
 204     return (int)ceil(m_adjust->upper);
 205 }
 206
 207 void wxSlider::SetPageSize( int pageSize )
 208 {
 209     float fpage = (float)pageSize;
 210
 211     if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
 212
 213     m_adjust->page_increment = fpage;
 214
 215     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 216 }
 217
 218 int wxSlider::GetPageSize() const
 219 {
 220     return (int)ceil(m_adjust->page_increment);
 221 }
 222
 223 void wxSlider::SetThumbLength( int len )
 224 {
 225     float flen = (float)len;
 226
 227     if (fabs(flen-m_adjust->page_size) < 0.2) return;
 228
 229     m_adjust->page_size = flen;
 230
 231     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 232 }
 233
 234 int wxSlider::GetThumbLength() const
 235 {
 236     return (int)ceil(m_adjust->page_size);
 237 }
 238
 239 void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
 240 {
 241 }
 242
 243 int wxSlider::GetLineSize() const
 244 {
 245     return 0;
 246 }
 247
 248 void wxSlider::SetTick( int WXUNUSED(tickPos) )
 249 {
 250 }
 251
 252 void wxSlider::SetTickFreq( int WXUNUSED(n), int WXUNUSED(pos) )
 253 {
 254 }
 255
 256 int wxSlider::GetTickFreq() const
 257 {
 258     return 0;
 259 }
 260
 261 void wxSlider::ClearTicks()
 262 {
 263 }
 264
 265 void wxSlider::SetSelection( int WXUNUSED(minPos), int WXUNUSED(maxPos) )
 266 {
 267 }
 268
 269 int wxSlider::GetSelEnd() const
 270 {
 271     return 0;
 272 }
 273
 274 int wxSlider::GetSelStart() const
 275 {
 276     return 0;
 277 }
 278
 279 void wxSlider::ClearSel()
 280 {
 281 }
 282
 283 bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
 284 {
 285     GtkRange *range = GTK_RANGE(m_widget);
 286     return ( (window == GTK_WIDGET(range)->window) ||
 287              (window == range->trough) ||
 288              (window == range->slider) ||
 289              (window == range->step_forw) ||
 290              (window == range->step_back) );
 291 }
 292
 293 void wxSlider::ApplyWidgetStyle()
 294 {
 295     SetWidgetStyle();
 296     gtk_widget_set_style( m_widget, m_widgetStyle );
 297 }
 298
 299 #endif