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     int value = (int)ceil(adjust->value);
  65
  66     int orient = wxHORIZONTAL;
  67     if ( (win->GetWindowStyleFlag() & wxSB_VERTICAL) == wxSB_VERTICAL)
  68         orient = wxVERTICAL;
  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     win->GetEventHandler()->ProcessEvent( cevent );
  77 }
  78
  79 //-----------------------------------------------------------------------------
  80 // wxSlider
  81 //-----------------------------------------------------------------------------
  82
  83 IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
  84
  85 bool wxSlider::Create(wxWindow *parent, wxWindowID id,
  86         int value, int minValue, int maxValue,
  87         const wxPoint& pos, const wxSize& size,
  88         long style, const wxValidator& validator, const wxString& name )
  89 {
  90     m_acceptsFocus = TRUE;
  91     m_needParent = TRUE;
  92
  93     if (!PreCreation( parent, pos, size ) ||
  94         !CreateBase( parent, id, pos, size, style, validator, name ))
  95     {
  96         wxFAIL_MSG( wxT("wxSlider creation failed") );
  97         return FALSE;
  98     }
  99
 100     m_oldPos = 0.0;
 101
 102     if (style & wxSL_VERTICAL)
 103         m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
 104     else
 105         m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
 106
 107     if (style & wxSL_LABELS)
 108     {
 109         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
 110         gtk_scale_set_digits( GTK_SCALE( m_widget ), 0 );
 111
 112         /* labels need more space and too small window will
 113            cause junk to appear on the dialog */
 114         if (style & wxSL_VERTICAL)
 115         {
 116             wxSize sz( size );
 117             if (sz.x < 35)
 118             {
 119                 sz.x = 35;
 120                 SetSize( sz );
 121             }
 122         }
 123         else
 124         {
 125             wxSize sz( size );
 126             if (sz.y < 35)
 127             {
 128                 sz.y = 35;
 129                 SetSize( sz );
 130             }
 131         }
 132     }
 133     else
 134         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 135
 136     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 137
 138     gtk_signal_connect( GTK_OBJECT(m_adjust),
 139                         "value_changed",
 140                         (GtkSignalFunc) gtk_slider_callback,
 141                         (gpointer) this );
 142
 143     SetRange( minValue, maxValue );
 144     SetValue( value );
 145
 146     m_parent->DoAddChild( this );
 147
 148     PostCreation();
 149
 150     SetBackgroundColour( parent->GetBackgroundColour() );
 151
 152     Show( TRUE );
 153
 154     return TRUE;
 155 }
 156
 157 int wxSlider::GetValue() const
 158 {
 159     return (int)(m_adjust->value+0.5);
 160 }
 161
 162 void wxSlider::SetValue( int value )
 163 {
 164     float fpos = (float)value;
 165     m_oldPos = fpos;
 166     if (fabs(fpos-m_adjust->value) < 0.2) return;
 167
 168     m_adjust->value = fpos;
 169
 170     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 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
 187     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 188 }
 189
 190 int wxSlider::GetMin() const
 191 {
 192     return (int)ceil(m_adjust->lower);
 193 }
 194
 195 int wxSlider::GetMax() const
 196 {
 197     return (int)ceil(m_adjust->upper);
 198 }
 199
 200 void wxSlider::SetPageSize( int pageSize )
 201 {
 202     float fpage = (float)pageSize;
 203
 204     if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
 205
 206     m_adjust->page_increment = fpage;
 207
 208     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 209 }
 210
 211 int wxSlider::GetPageSize() const
 212 {
 213     return (int)ceil(m_adjust->page_increment);
 214 }
 215
 216 void wxSlider::SetThumbLength( int len )
 217 {
 218     float flen = (float)len;
 219
 220     if (fabs(flen-m_adjust->page_size) < 0.2) return;
 221
 222     m_adjust->page_size = flen;
 223
 224     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 225 }
 226
 227 int wxSlider::GetThumbLength() const
 228 {
 229     return (int)ceil(m_adjust->page_size);
 230 }
 231
 232 void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
 233 {
 234 }
 235
 236 int wxSlider::GetLineSize() const
 237 {
 238     return 0;
 239 }
 240
 241 void wxSlider::SetTick( int WXUNUSED(tickPos) )
 242 {
 243 }
 244
 245 void wxSlider::SetTickFreq( int WXUNUSED(n), int WXUNUSED(pos) )
 246 {
 247 }
 248
 249 int wxSlider::GetTickFreq() const
 250 {
 251     return 0;
 252 }
 253
 254 void wxSlider::ClearTicks()
 255 {
 256 }
 257
 258 void wxSlider::SetSelection( int WXUNUSED(minPos), int WXUNUSED(maxPos) )
 259 {
 260 }
 261
 262 int wxSlider::GetSelEnd() const
 263 {
 264     return 0;
 265 }
 266
 267 int wxSlider::GetSelStart() const
 268 {
 269     return 0;
 270 }
 271
 272 void wxSlider::ClearSel()
 273 {
 274 }
 275
 276 bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
 277 {
 278     GtkRange *range = GTK_RANGE(m_widget);
 279     return ( (window == GTK_WIDGET(range)->window) ||
 280              (window == range->trough) ||
 281              (window == range->slider) ||
 282              (window == range->step_forw) ||
 283              (window == range->step_back) );
 284 }
 285
 286 void wxSlider::ApplyWidgetStyle()
 287 {
 288     SetWidgetStyle();
 289     gtk_widget_set_style( m_widget, m_widgetStyle );
 290 }
 291
 292 #endif