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
 116         /* labels need more space and too small window will
 117            cause junk to appear on the dialog */
 118         if (style & wxSL_VERTICAL)
 119         {
 120             wxSize sz( size );
 121             if (sz.x < 35)
 122             {
 123                 sz.x = 35;
 124                 SetSize( sz );
 125             }
 126         }
 127         else
 128         {
 129             wxSize sz( size );
 130             if (sz.y < 35)
 131             {
 132                 sz.y = 35;
 133                 SetSize( sz );
 134             }
 135         }
 136     }
 137     else
 138         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 139
 140     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 141
 142     gtk_signal_connect( GTK_OBJECT(m_adjust),
 143                         "value_changed",
 144                         (GtkSignalFunc) gtk_slider_callback,
 145                         (gpointer) this );
 146
 147     SetRange( minValue, maxValue );
 148     SetValue( value );
 149
 150     m_parent->DoAddChild( this );
 151
 152     PostCreation();
 153
 154     SetBackgroundColour( parent->GetBackgroundColour() );
 155
 156     Show( TRUE );
 157
 158     return TRUE;
 159 }
 160
 161 int wxSlider::GetValue(void) const
 162 {
 163     return (int)(m_adjust->value+0.5);
 164 }
 165
 166 void wxSlider::SetValue( int value )
 167 {
 168     float fpos = (float)value;
 169     m_oldPos = fpos;
 170     if (fabs(fpos-m_adjust->value) < 0.2) return;
 171
 172     m_adjust->value = fpos;
 173
 174     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 175 }
 176
 177 void wxSlider::SetRange( int minValue, int maxValue )
 178 {
 179     float fmin = (float)minValue;
 180     float fmax = (float)maxValue;
 181
 182     if ((fabs(fmin-m_adjust->lower) < 0.2) &&
 183         (fabs(fmax-m_adjust->upper) < 0.2))
 184     {
 185         return;
 186     }
 187
 188     m_adjust->lower = fmin;
 189     m_adjust->upper = fmax;
 190
 191     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 192 }
 193
 194 int wxSlider::GetMin(void) const
 195 {
 196     return (int)ceil(m_adjust->lower);
 197 }
 198
 199 int wxSlider::GetMax(void) const
 200 {
 201     return (int)ceil(m_adjust->upper);
 202 }
 203
 204 void wxSlider::SetPageSize( int pageSize )
 205 {
 206     float fpage = (float)pageSize;
 207
 208     if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
 209
 210     m_adjust->page_increment = fpage;
 211
 212     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 213 }
 214
 215 int wxSlider::GetPageSize(void) const
 216 {
 217     return (int)ceil(m_adjust->page_increment);
 218 }
 219
 220 void wxSlider::SetThumbLength( int len )
 221 {
 222     float flen = (float)len;
 223
 224     if (fabs(flen-m_adjust->page_size) < 0.2) return;
 225
 226     m_adjust->page_size = flen;
 227
 228     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 229 }
 230
 231 int wxSlider::GetThumbLength(void) const
 232 {
 233     return (int)ceil(m_adjust->page_size);
 234 }
 235
 236 void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
 237 {
 238 }
 239
 240 int wxSlider::GetLineSize(void) const
 241 {
 242     return 0;
 243 }
 244
 245 void wxSlider::SetTick( int WXUNUSED(tickPos) )
 246 {
 247 }
 248
 249 void wxSlider::SetTickFreq( int WXUNUSED(n), int WXUNUSED(pos) )
 250 {
 251 }
 252
 253 int wxSlider::GetTickFreq(void) const
 254 {
 255     return 0;
 256 }
 257
 258 void wxSlider::ClearTicks(void)
 259 {
 260 }
 261
 262 void wxSlider::SetSelection( int WXUNUSED(minPos), int WXUNUSED(maxPos) )
 263 {
 264 }
 265
 266 int wxSlider::GetSelEnd(void) const
 267 {
 268     return 0;
 269 }
 270
 271 int wxSlider::GetSelStart(void) const
 272 {
 273     return 0;
 274 }
 275
 276 void wxSlider::ClearSel(void)
 277 {
 278 }
 279
 280 bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
 281 {
 282     GtkRange *range = GTK_RANGE(m_widget);
 283     return ( (window == GTK_WIDGET(range)->window) ||
 284              (window == range->trough) ||
 285              (window == range->slider) ||
 286              (window == range->step_forw) ||
 287              (window == range->step_back) );
 288 }
 289
 290 void wxSlider::ApplyWidgetStyle()
 291 {
 292     SetWidgetStyle();
 293     gtk_widget_set_style( m_widget, m_widgetStyle );
 294 }
 295
 296 #endif