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) orient = wxVERTICAL;
  65
  66     wxScrollEvent event( command, win->GetId(), value, orient );
  67     event.SetEventObject( win );
  68     win->GetEventHandler()->ProcessEvent( event );
  69
  70     wxCommandEvent cevent( wxEVT_COMMAND_SLIDER_UPDATED, win->GetId() );
  71     cevent.SetEventObject( win );
  72     win->GetEventHandler()->ProcessEvent( cevent );
  73 }
  74
  75 //-----------------------------------------------------------------------------
  76 // wxSlider
  77 //-----------------------------------------------------------------------------
  78
  79 IMPLEMENT_DYNAMIC_CLASS(wxSlider,wxControl)
  80
  81 wxSlider::wxSlider(void)
  82 {
  83 }
  84
  85 wxSlider::~wxSlider(void)
  86 {
  87 }
  88
  89 bool wxSlider::Create(wxWindow *parent, wxWindowID id,
  90         int value, int minValue, int maxValue,
  91         const wxPoint& pos, const wxSize& size,
  92         long style, const wxValidator& validator, const wxString& name )
  93 {
  94     m_acceptsFocus = TRUE;
  95     m_needParent = TRUE;
  96
  97     if (!PreCreation( parent, pos, size ) ||
  98         !CreateBase( parent, id, pos, size, style, validator, name ))
  99     {
 100         wxFAIL_MSG( wxT("wxSlider creation failed") );
 101         return FALSE;
 102     }
 103
 104     m_oldPos = 0.0;
 105
 106     if (style & wxSL_VERTICAL)
 107         m_widget = gtk_vscale_new( (GtkAdjustment *) NULL );
 108     else
 109         m_widget = gtk_hscale_new( (GtkAdjustment *) NULL );
 110
 111     if (style & wxSL_LABELS)
 112     {
 113         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), TRUE );
 114
 115         /* labels need more space and too small window will
 116            cause junk to appear on the dialog */
 117         if (style & wxSL_VERTICAL)
 118         {
 119             wxSize sz( size );
 120             if (sz.x < 35)
 121             {
 122                 sz.x = 35;
 123                 SetSize( sz );
 124             }
 125         }
 126         else
 127         {
 128             wxSize sz( size );
 129             if (sz.y < 35)
 130             {
 131                 sz.y = 35;
 132                 SetSize( sz );
 133             }
 134         }
 135     }
 136     else
 137         gtk_scale_set_draw_value( GTK_SCALE( m_widget ), FALSE );
 138
 139     m_adjust = gtk_range_get_adjustment( GTK_RANGE(m_widget) );
 140
 141     gtk_signal_connect( GTK_OBJECT(m_adjust),
 142                         "value_changed",
 143                         (GtkSignalFunc) gtk_slider_callback,
 144                         (gpointer) this );
 145
 146     SetRange( minValue, maxValue );
 147     SetValue( value );
 148
 149     m_parent->DoAddChild( this );
 150
 151     PostCreation();
 152
 153     SetBackgroundColour( parent->GetBackgroundColour() );
 154
 155     Show( TRUE );
 156
 157     return TRUE;
 158 }
 159
 160 int wxSlider::GetValue(void) const
 161 {
 162     return (int)(m_adjust->value+0.5);
 163 }
 164
 165 void wxSlider::SetValue( int value )
 166 {
 167     float fpos = (float)value;
 168     m_oldPos = fpos;
 169     if (fabs(fpos-m_adjust->value) < 0.2) return;
 170
 171     m_adjust->value = fpos;
 172
 173     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "value_changed" );
 174 }
 175
 176 void wxSlider::SetRange( int minValue, int maxValue )
 177 {
 178     float fmin = (float)minValue;
 179     float fmax = (float)maxValue;
 180
 181     if ((fabs(fmin-m_adjust->lower) < 0.2) &&
 182         (fabs(fmax-m_adjust->upper) < 0.2))
 183     {
 184         return;
 185     }
 186
 187     m_adjust->lower = fmin;
 188     m_adjust->upper = fmax;
 189
 190     gtk_signal_emit_by_name( GTK_OBJECT(m_adjust), "changed" );
 191 }
 192
 193 int wxSlider::GetMin(void) const
 194 {
 195     return (int)ceil(m_adjust->lower);
 196 }
 197
 198 int wxSlider::GetMax(void) 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(void) 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(void) 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(void) 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(void) const
 253 {
 254     return 0;
 255 }
 256
 257 void wxSlider::ClearTicks(void)
 258 {
 259 }
 260
 261 void wxSlider::SetSelection( int WXUNUSED(minPos), int WXUNUSED(maxPos) )
 262 {
 263 }
 264
 265 int wxSlider::GetSelEnd(void) const
 266 {
 267     return 0;
 268 }
 269
 270 int wxSlider::GetSelStart(void) const
 271 {
 272     return 0;
 273 }
 274
 275 void wxSlider::ClearSel(void)
 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