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     cevent.SetInt( value );
  77     win->GetEventHandler()->ProcessEvent( cevent );
  78 }
  79
  80 //-----------------------------------------------------------------------------
  81 // wxSlider
  82 //-----------------------------------------------------------------------------
  83
  84 IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
  85
  86 bool wxSlider::Create(wxWindow *parent, wxWindowID id,
  87         int value, int minValue, int maxValue,
  88         const wxPoint& pos, const wxSize& size,
  89         long style, const wxValidator& validator, const wxString& name )
  90 {
  91     m_acceptsFocus = TRUE;
  92     m_needParent = TRUE;
  93
  94     if (!PreCreation( parent, pos, size ) ||
  95         !CreateBase( parent, id, pos, size, style, validator, name ))
  96     {
  97         wxFAIL_MSG( wxT("wxSlider creation failed") );
  98             return FALSE;
  99     }
 100
 101     m_oldPos = 0.0;
 102
 103     if (style & wxSL_VERTICAL)
 104         m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
 105     else
 106         m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
 107
 108     if (style & wxSL_LABELS)
 109     {
 110         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
 111             gtk_scale_set_digits( GTK_SCALE( m_widget ), 0 );
 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() 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     m_adjust->step_increment = 1.0;
 188     m_adjust->page_increment = ceil((fmax-fmin) / 10.0);
 189
 190     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 191 }
 192
 193 int wxSlider::GetMin() const
 194 {
 195     return (int)ceil(m_adjust->lower);
 196 }
 197
 198 int wxSlider::GetMax() const
 199 {
 200     return (int)ceil(m_adjust->upper);
 201 }
 202
 203 void wxSlider::SetPageSize( int pageSize )
 204 {
 205     float fpage = (float)pageSize;
 206
 207     if (fabs(fpage-m_adjust->page_increment) < 0.2) return;
 208
 209     m_adjust->page_increment = fpage;
 210
 211     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 212 }
 213
 214 int wxSlider::GetPageSize() const
 215 {
 216     return (int)ceil(m_adjust->page_increment);
 217 }
 218
 219 void wxSlider::SetThumbLength( int len )
 220 {
 221     float flen = (float)len;
 222
 223     if (fabs(flen-m_adjust->page_size) < 0.2) return;
 224
 225     m_adjust->page_size = flen;
 226
 227     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 228 }
 229
 230 int wxSlider::GetThumbLength() const
 231 {
 232     return (int)ceil(m_adjust->page_size);
 233 }
 234
 235 void wxSlider::SetLineSize( int WXUNUSED(lineSize) )
 236 {
 237 }
 238
 239 int wxSlider::GetLineSize() const
 240 {
 241     return 0;
 242 }
 243
 244 void wxSlider::SetTick( int WXUNUSED(tickPos) )
 245 {
 246 }
 247
 248 void wxSlider::SetTickFreq( int WXUNUSED(n), int WXUNUSED(pos) )
 249 {
 250 }
 251
 252 int wxSlider::GetTickFreq() const
 253 {
 254     return 0;
 255 }
 256
 257 void wxSlider::ClearTicks()
 258 {
 259 }
 260
 261 void wxSlider::SetSelection( int WXUNUSED(minPos), int WXUNUSED(maxPos) )
 262 {
 263 }
 264
 265 int wxSlider::GetSelEnd() const
 266 {
 267     return 0;
 268 }
 269
 270 int wxSlider::GetSelStart() const
 271 {
 272     return 0;
 273 }
 274
 275 void wxSlider::ClearSel()
 276 {
 277 }
 278
 279 bool wxSlider::IsOwnGtkWindow( GdkWindow *window )
 280 {
 281     GtkRange *range = GTK_RANGE(m_widget);
 282     return ( (window == GTK_WIDGET(range)->window) ||
 283              (window == range->trough) ||
 284              (window == range->slider) ||
 285              (window == range->step_forw) ||
 286              (window == range->step_back) );
 287 }
 288
 289 void wxSlider::ApplyWidgetStyle()
 290 {
 291     SetWidgetStyle();
 292     gtk_widget_set_style( m_widget, m_widgetStyle );
 293 }
 294
 295 #endif