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( GtkWidget *WXUNUSED(widget), 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 = win->m_adjust->value - win->m_oldPos;
  49     if (fabs(diff) < 0.2) return;
  50     win->m_oldPos = win->m_adjust->value;
  51
  52     wxEventType command = wxEVT_NULL;
  53
  54     float line_step = win->m_adjust->step_increment;
  55     float page_step = win->m_adjust->page_increment;
  56
  57     if (fabs(win->m_adjust->value-win->m_adjust->lower) < 0.2) command = wxEVT_SCROLL_BOTTOM;
  58     else if (fabs(win->m_adjust->value-win->m_adjust->upper) < 0.2) command = wxEVT_SCROLL_TOP;
  59     else if (fabs(diff-line_step) < 0.2) command = wxEVT_SCROLL_LINEDOWN;
  60     else if (fabs(diff+line_step) < 0.2) command = wxEVT_SCROLL_LINEUP;
  61     else if (fabs(diff-page_step) < 0.2) command = wxEVT_SCROLL_PAGEDOWN;
  62     else if (fabs(diff+page_step) < 0.2) command = wxEVT_SCROLL_PAGEUP;
  63     else command = wxEVT_SCROLL_THUMBTRACK;
  64
  65     int value = (int)ceil(win->m_adjust->value);
  66
  67     int orient = wxHORIZONTAL;
  68     if (win->GetWindowStyleFlag() & wxSB_VERTICAL == wxSB_VERTICAL) 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 wxSlider::wxSlider(void)
  86 {
  87 }
  88
  89 wxSlider::~wxSlider(void)
  90 {
  91 }
  92
  93 bool wxSlider::Create(wxWindow *parent, wxWindowID id,
  94         int value, int minValue, int maxValue,
  95         const wxPoint& pos, const wxSize& size,
  96         long style, const wxValidator& validator, const wxString& name )
  97 {
  98     m_acceptsFocus = TRUE;
  99     m_needParent = TRUE;
 100
 101     if (!PreCreation( parent, pos, size ) ||
 102         !CreateBase( parent, id, pos, size, style, validator, name ))
 103     {
 104         wxFAIL_MSG( _T("wxSlider creation failed") );
 105         return FALSE;
 106     }
 107
 108     m_oldPos = 0.0;
 109
 110     if (style & wxSL_VERTICAL)
 111         m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
 112     else
 113         m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
 114
 115     if (style & wxSL_LABELS)
 116     {
 117         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
 118
 119         /* labels need more space and too small window will
 120            cause junk to appear on the dialog */
 121         if (style & wxSL_VERTICAL)
 122         {
 123             wxSize sz( size );
 124             if (sz.x < 35)
 125             {
 126                 sz.x = 35;
 127                 SetSize( sz );
 128             }
 129         }
 130         else
 131         {
 132             wxSize sz( size );
 133             if (sz.y < 35)
 134             {
 135                 sz.y = 35;
 136                 SetSize( sz );
 137             }
 138         }
 139     }
 140     else
 141         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 142
 143     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 144
 145     gtk_signal_connect( GTK_OBJECT(m_adjust),
 146                         "value_changed",
 147                         (GtkSignalFunc) gtk_slider_callback,
 148                         (gpointer) this );
 149
 150     SetRange( minValue, maxValue );
 151     SetValue( value );
 152
 153     m_parent->DoAddChild( this );
 154
 155     PostCreation();
 156
 157     SetBackgroundColour( parent->GetBackgroundColour() );
 158
 159     Show( TRUE );
 160
 161     return TRUE;
 162 }
 163
 164 int wxSlider::GetValue(void) const
 165 {
 166     return (int)(m_adjust->value+0.5);
 167 }
 168
 169 void wxSlider::SetValue( int value )
 170 {
 171     float fpos = (float)value;
 172     m_oldPos = fpos;
 173     if (fabs(fpos-m_adjust->value) < 0.2) return;
 174
 175     m_adjust->value = fpos;
 176
 177     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 178 }
 179
 180 void wxSlider::SetRange( int minValue, int maxValue )
 181 {
 182     float fmin = (float)minValue;
 183     float fmax = (float)maxValue;
 184
 185     if ((fabs(fmin-m_adjust->lower) < 0.2) &&
 186         (fabs(fmax-m_adjust->upper) < 0.2))
 187     {
 188         return;
 189     }
 190
 191     m_adjust->lower = fmin;
 192     m_adjust->upper = fmax;
 193
 194     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 195 }
 196
 197 int wxSlider::GetMin(void) const
 198 {
 199     return (int)ceil(m_adjust->lower);
 200 }
 201
 202 int wxSlider::GetMax(void) 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(void) 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(void) 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(void) 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(void) const
 257 {
 258     return 0;
 259 }
 260
 261 void wxSlider::ClearTicks(void)
 262 {
 263 }
 264
 265 void wxSlider::SetSelection( int WXUNUSED(minPos), int WXUNUSED(maxPos) )
 266 {
 267 }
 268
 269 int wxSlider::GetSelEnd(void) const
 270 {
 271     return 0;
 272 }
 273
 274 int wxSlider::GetSelStart(void) const
 275 {
 276     return 0;
 277 }
 278
 279 void wxSlider::ClearSel(void)
 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