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 #include "wx/utils.h"
  16 #include <math.h>
  17
  18 #include "gdk/gdk.h"
  19 #include "gtk/gtk.h"
  20
  21 //-----------------------------------------------------------------------------
  22 // idle system
  23 //-----------------------------------------------------------------------------
  24
  25 extern void wxapp_install_idle_handler();
  26 extern bool g_isIdle;
  27
  28 //-----------------------------------------------------------------------------
  29 // data
  30 //-----------------------------------------------------------------------------
  31
  32 extern bool   g_blockEventsOnDrag;
  33
  34 //-----------------------------------------------------------------------------
  35 // "value_changed"
  36 //-----------------------------------------------------------------------------
  37
  38 static void gtk_slider_callback( GtkWidget *WXUNUSED(widget), wxSlider *win )
  39 {
  40     if (g_isIdle) wxapp_install_idle_handler();
  41
  42     if (!win->m_hasVMT) return;
  43     if (g_blockEventsOnDrag) return;
  44
  45     float diff = win->m_adjust->value - win->m_oldPos;
  46     if (fabs(diff) < 0.2) return;
  47     win->m_oldPos = win->m_adjust->value;
  48
  49     wxEventType command = wxEVT_NULL;
  50
  51     float line_step = win->m_adjust->step_increment;
  52     float page_step = win->m_adjust->page_increment;
  53
  54     if (fabs(win->m_adjust->value-win->m_adjust->lower) < 0.2) command = wxEVT_SCROLL_BOTTOM;
  55     else if (fabs(win->m_adjust->value-win->m_adjust->upper) < 0.2) command = wxEVT_SCROLL_TOP;
  56     else if (fabs(diff-line_step) < 0.2) command = wxEVT_SCROLL_LINEDOWN;
  57     else if (fabs(diff+line_step) < 0.2) command = wxEVT_SCROLL_LINEUP;
  58     else if (fabs(diff-page_step) < 0.2) command = wxEVT_SCROLL_PAGEDOWN;
  59     else if (fabs(diff+page_step) < 0.2) command = wxEVT_SCROLL_PAGEUP;
  60     else command = wxEVT_SCROLL_THUMBTRACK;
  61
  62     int value = (int)ceil(win->m_adjust->value);
  63
  64     int orient = wxHORIZONTAL;
  65     if (win->GetWindowStyleFlag() & wxSB_VERTICAL == wxSB_VERTICAL) 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     PreCreation( parent, id, pos, size, style, name );
  99
 100     SetValidator( validator );
 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
 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(void) const
 159 {
 160     return (int)(m_adjust->value+0.5);
 161 }
 162
 163 void wxSlider::SetValue( int value )
 164 {
 165     float fpos = (float)value;
 166     m_oldPos = fpos;
 167     if (fabs(fpos-m_adjust->value) < 0.2) return;
 168
 169     m_adjust->value = fpos;
 170
 171     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 172 }
 173
 174 void wxSlider::SetRange( int minValue, int maxValue )
 175 {
 176     float fmin = (float)minValue;
 177     float fmax = (float)maxValue;
 178
 179     if ((fabs(fmin-m_adjust->lower) < 0.2) &&
 180         (fabs(fmax-m_adjust->upper) < 0.2))
 181     {
 182         return;
 183     }
 184
 185     m_adjust->lower = fmin;
 186     m_adjust->upper = fmax;
 187
 188     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 189 }
 190
 191 int wxSlider::GetMin(void) const
 192 {
 193     return (int)ceil(m_adjust->lower);
 194 }
 195
 196 int wxSlider::GetMax(void) const
 197 {
 198     return (int)ceil(m_adjust->upper);
 199 }
 200
 201 void wxSlider::SetPageSize( int pageSize )
 202 {
 203     float fpage = (float)pageSize;
 204
 205     if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
 206
 207     m_adjust->page_increment = fpage;
 208
 209     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 210 }
 211
 212 int wxSlider::GetPageSize(void) const
 213 {
 214     return (int)ceil(m_adjust->page_increment);
 215 }
 216
 217 void wxSlider::SetThumbLength( int len )
 218 {
 219     float flen = (float)len;
 220
 221     if (fabs(flen-m_adjust->page_size) < 0.2) return;
 222
 223     m_adjust->page_size = flen;
 224
 225     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 226 }
 227
 228 int wxSlider::GetThumbLength(void) const
 229 {
 230     return (int)ceil(m_adjust->page_size);
 231 }
 232
 233 void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
 234 {
 235 }
 236
 237 int wxSlider::GetLineSize(void) const
 238 {
 239     return 0;
 240 }
 241
 242 void wxSlider::SetTick( int WXUNUSED(tickPos) )
 243 {
 244 }
 245
 246 void wxSlider::SetTickFreq( int WXUNUSED(n), int WXUNUSED(pos) )
 247 {
 248 }
 249
 250 int wxSlider::GetTickFreq(void) const
 251 {
 252     return 0;
 253 }
 254
 255 void wxSlider::ClearTicks(void)
 256 {
 257 }
 258
 259 void wxSlider::SetSelection( int WXUNUSED(minPos), int WXUNUSED(maxPos) )
 260 {
 261 }
 262
 263 int wxSlider::GetSelEnd(void) const
 264 {
 265     return 0;
 266 }
 267
 268 int wxSlider::GetSelStart(void) const
 269 {
 270     return 0;
 271 }
 272
 273 void wxSlider::ClearSel(void)
 274 {
 275 }
 276
 277 bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
 278 {
 279     GtkRange *range = GTK_RANGE(m_widget);
 280     return ( (window == GTK_WIDGET(range)->window) ||
 281              (window == range->trough) ||
 282              (window == range->slider) ||
 283              (window == range->step_forw) ||
 284              (window == range->step_back) );
 285 }
 286
 287 void wxSlider::ApplyWidgetStyle()
 288 {
 289     SetWidgetStyle();
 290     gtk_widget_set_style( m_widget, m_widgetStyle );
 291 }