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 #include <math.h>
  20
  21 #include "gdk/gdk.h"
  22 #include "gtk/gtk.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 //-----------------------------------------------------------------------------
  38 // "value_changed"
  39 //-----------------------------------------------------------------------------
  40
  41 static void gtk_slider_callback( GtkAdjustment *adjust, wxSlider *win )
  42 {
  43     if (g_isIdle) wxapp_install_idle_handler();
  44
  45     if (!win->m_hasVMT) return;
  46     if (g_blockEventsOnDrag) return;
  47
  48     float diff = adjust->value - win->m_oldPos;
  49     if (fabs(diff) < 0.2) return;
  50
  51     win->m_oldPos = adjust->value;
  52
  53     GtkRange *range = GTK_RANGE( win->m_widget );
  54
  55     wxEventType command = wxEVT_SCROLL_THUMBTRACK;
  56     if      (range->scroll_type == GTK_SCROLL_STEP_BACKWARD) command = wxEVT_SCROLL_LINEUP;
  57     else if (range->scroll_type == GTK_SCROLL_STEP_FORWARD)  command = wxEVT_SCROLL_LINEDOWN;
  58     else if (range->scroll_type == GTK_SCROLL_PAGE_BACKWARD) command = wxEVT_SCROLL_PAGEUP;
  59     else if (range->scroll_type == GTK_SCROLL_PAGE_FORWARD)  command = wxEVT_SCROLL_PAGEDOWN;
  60
  61     int value = (int)ceil(adjust->value);
  62
  63     int orient = wxHORIZONTAL;
  64     if ( (win->GetWindowStyleFlag() & wxSB_VERTICAL) == wxSB_VERTICAL)
  65         orient = wxVERTICAL;
  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     win->GetEventHandler()->ProcessEvent( cevent );
  74 }
  75
  76 //-----------------------------------------------------------------------------
  77 // wxSlider
  78 //-----------------------------------------------------------------------------
  79
  80 IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
  81
  82 wxSlider::wxSlider(void)
  83 {
  84 }
  85
  86 wxSlider::~wxSlider(void)
  87 {
  88 }
  89
  90 bool wxSlider::Create(wxWindow *parent, wxWindowID id,
  91         int value, int minValue, int maxValue,
  92         const wxPoint& pos, const wxSize& size,
  93         long style, const wxValidator& validator, const wxString& name )
  94 {
  95     m_acceptsFocus = TRUE;
  96     m_needParent = TRUE;
  97
  98     if (!PreCreation( parent, pos, size ) ||
  99         !CreateBase( parent, id, pos, size, style, validator, name ))
 100     {
 101         wxFAIL_MSG( wxT("wxSlider creation failed") );
 102         return FALSE;
 103     }
 104
 105     m_oldPos = 0.0;
 106
 107     if (style & wxSL_VERTICAL)
 108         m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
 109     else
 110         m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
 111
 112     if (style & wxSL_LABELS)
 113     {
 114         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
 115         gtk_scale_set_digits( GTK_SCALE( m_widget ), 0 );
 116
 117         /* labels need more space and too small window will
 118            cause junk to appear on the dialog */
 119         if (style & wxSL_VERTICAL)
 120         {
 121             wxSize sz( size );
 122             if (sz.x < 35)
 123             {
 124                 sz.x = 35;
 125                 SetSize( sz );
 126             }
 127         }
 128         else
 129         {
 130             wxSize sz( size );
 131             if (sz.y < 35)
 132             {
 133                 sz.y = 35;
 134                 SetSize( sz );
 135             }
 136         }
 137     }
 138     else
 139         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 140
 141     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 142
 143     gtk_signal_connect( GTK_OBJECT(m_adjust),
 144                         "value_changed",
 145                         (GtkSignalFunc) gtk_slider_callback,
 146                         (gpointer) this );
 147
 148     SetRange( minValue, maxValue );
 149     SetValue( value );
 150
 151     m_parent->DoAddChild( this );
 152
 153     PostCreation();
 154
 155     SetBackgroundColour( parent->GetBackgroundColour() );
 156
 157     Show( TRUE );
 158
 159     return TRUE;
 160 }
 161
 162 int wxSlider::GetValue(void) const
 163 {
 164     return (int)(m_adjust->value+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
 192     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 193 }
 194
 195 int wxSlider::GetMin(void) const
 196 {
 197     return (int)ceil(m_adjust->lower);
 198 }
 199
 200 int wxSlider::GetMax(void) const
 201 {
 202     return (int)ceil(m_adjust->upper);
 203 }
 204
 205 void wxSlider::SetPageSize( int pageSize )
 206 {
 207     float fpage = (float)pageSize;
 208
 209     if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
 210
 211     m_adjust->page_increment = fpage;
 212
 213     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 214 }
 215
 216 int wxSlider::GetPageSize(void) const
 217 {
 218     return (int)ceil(m_adjust->page_increment);
 219 }
 220
 221 void wxSlider::SetThumbLength( int len )
 222 {
 223     float flen = (float)len;
 224
 225     if (fabs(flen-m_adjust->page_size) < 0.2) return;
 226
 227     m_adjust->page_size = flen;
 228
 229     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 230 }
 231
 232 int wxSlider::GetThumbLength(void) const
 233 {
 234     return (int)ceil(m_adjust->page_size);
 235 }
 236
 237 void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
 238 {
 239 }
 240
 241 int wxSlider::GetLineSize(void) const
 242 {
 243     return 0;
 244 }
 245
 246 void wxSlider::SetTick( int WXUNUSED(tickPos) )
 247 {
 248 }
 249
 250 void wxSlider::SetTickFreq( int WXUNUSED(n), int WXUNUSED(pos) )
 251 {
 252 }
 253
 254 int wxSlider::GetTickFreq(void) const
 255 {
 256     return 0;
 257 }
 258
 259 void wxSlider::ClearTicks(void)
 260 {
 261 }
 262
 263 void wxSlider::SetSelection( int WXUNUSED(minPos), int WXUNUSED(maxPos) )
 264 {
 265 }
 266
 267 int wxSlider::GetSelEnd(void) const
 268 {
 269     return 0;
 270 }
 271
 272 int wxSlider::GetSelStart(void) const
 273 {
 274     return 0;
 275 }
 276
 277 void wxSlider::ClearSel(void)
 278 {
 279 }
 280
 281 bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
 282 {
 283     GtkRange *range = GTK_RANGE(m_widget);
 284     return ( (window == GTK_WIDGET(range)->window) ||
 285              (window == range->trough) ||
 286              (window == range->slider) ||
 287              (window == range->step_forw) ||
 288              (window == range->step_back) );
 289 }
 290
 291 void wxSlider::ApplyWidgetStyle()
 292 {
 293     SetWidgetStyle();
 294     gtk_widget_set_style( m_widget, m_widgetStyle );
 295 }
 296
 297 #endif