gtkspinbutton.c

gtk是linux一款强大的夸平台的图形化开发工具

      return TRUE;

    case GDK_Page_Down:

      if (event->state & GDK_CONTROL_MASK)
	{
	  gfloat diff = spin->adjustment->value - spin->adjustment->lower;
	  if (diff > EPSILON)
	    gtk_spin_button_real_spin (spin, -diff);
	}
      else
	gtk_spin_button_real_spin (spin, -spin->adjustment->page_increment);
      return TRUE;

    default:
      break;
    }

  return GTK_WIDGET_CLASS (parent_class)->key_press_event (widget, event);
}

static gint
gtk_spin_button_key_release (GtkWidget   *widget,
			     GdkEventKey *event)
{
  GtkSpinButton *spin;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_SPIN_BUTTON (widget), FALSE);
  
  spin = GTK_SPIN_BUTTON (widget);
  
  spin->ev_time = event->time;
  return TRUE;
}

static void
gtk_spin_button_snap (GtkSpinButton *spin_button,
		      gfloat         val)
{
  gfloat inc;
  gfloat tmp;
  
  inc = spin_button->adjustment->step_increment;
  tmp = (val - spin_button->adjustment->lower) / inc;
  if (tmp - floor (tmp) < ceil (tmp) - tmp)
    val = spin_button->adjustment->lower + floor (tmp) * inc;
  else
    val = spin_button->adjustment->lower + ceil (tmp) * inc;

  if (fabs (val - spin_button->adjustment->value) > EPSILON)
    gtk_adjustment_set_value (spin_button->adjustment, val);
  else
    {
      char buf[MAX_TEXT_LENGTH];

      sprintf (buf, "%0.*f", spin_button->digits, 
	       spin_button->adjustment->value);
      if (strcmp (buf, gtk_entry_get_text (GTK_ENTRY (spin_button))))
	gtk_entry_set_text (GTK_ENTRY (spin_button), buf);
    }
}

void 
gtk_spin_button_update (GtkSpinButton *spin_button)
{
  gfloat val;
  gchar *error = NULL;

  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));

  val = strtod (gtk_entry_get_text (GTK_ENTRY (spin_button)), &error);

  if (spin_button->update_policy == GTK_UPDATE_ALWAYS)
    {
      if (val < spin_button->adjustment->lower)
	val = spin_button->adjustment->lower;
      else if (val > spin_button->adjustment->upper)
	val = spin_button->adjustment->upper;
    }
  else if ((spin_button->update_policy == GTK_UPDATE_IF_VALID) && 
	   (*error ||
	   val < spin_button->adjustment->lower ||
	   val > spin_button->adjustment->upper))
    {
      gtk_spin_button_value_changed (spin_button->adjustment, spin_button);
      return;
    }

  if (spin_button->snap_to_ticks)
    gtk_spin_button_snap (spin_button, val);
  else
    {
      if (fabs (val - spin_button->adjustment->value) > EPSILON)
	gtk_adjustment_set_value (spin_button->adjustment, val);
      else
	{
	  char buf[MAX_TEXT_LENGTH];
	  
	  sprintf (buf, "%0.*f", spin_button->digits, 
		   spin_button->adjustment->value);
	  if (strcmp (buf, gtk_entry_get_text (GTK_ENTRY (spin_button))))
	    gtk_entry_set_text (GTK_ENTRY (spin_button), buf);
	}
    }
}

static void
gtk_spin_button_activate (GtkEditable *editable)
{
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (editable));

  if (editable->editable)
    gtk_spin_button_update (GTK_SPIN_BUTTON (editable));
}

static void
gtk_spin_button_insert_text (GtkEditable *editable,
			     const gchar *new_text,
			     gint         new_text_length,
			     gint        *position)
{
  GtkEntry *entry;
  GtkSpinButton *spin;
 
  g_return_if_fail (editable != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (editable));

  entry = GTK_ENTRY (editable);
  spin  = GTK_SPIN_BUTTON (editable);

  if (spin->numeric)
    {
      struct lconv *lc;
      gboolean sign;
      gint dotpos = -1;
      gint i;
      GdkWChar pos_sign;
      GdkWChar neg_sign;
      guint entry_length;

      entry_length = entry->text_length;

      lc = localeconv ();

      if (*(lc->negative_sign))
	neg_sign = *(lc->negative_sign);
      else 
	neg_sign = '-';

      if (*(lc->positive_sign))
	pos_sign = *(lc->positive_sign);
      else 
	pos_sign = '+';

      for (sign=0, i=0; i<entry_length; i++)
	if ((entry->text[i] == neg_sign) ||
	    (entry->text[i] == pos_sign))
	  {
	    sign = 1;
	    break;
	  }

      if (sign && !(*position))
	return;

      for (dotpos=-1, i=0; i<entry_length; i++)
	if (entry->text[i] == *(lc->decimal_point))
	  {
	    dotpos = i;
	    break;
	  }

      if (dotpos > -1 && *position > dotpos &&
	  spin->digits - entry_length
	    + dotpos - new_text_length + 1 < 0)
	return;

      for (i = 0; i < new_text_length; i++)
	{
	  if (new_text[i] == neg_sign || new_text[i] == pos_sign)
	    {
	      if (sign || (*position) || i)
		return;
	      sign = TRUE;
	    }
	  else if (new_text[i] == *(lc->decimal_point))
	    {
	      if (!spin->digits || dotpos > -1 || 
 		  (new_text_length - 1 - i + entry_length
		    - *position > spin->digits)) 
		return;
	      dotpos = *position + i;
	    }
	  else if (new_text[i] < 0x30 || new_text[i] > 0x39)
	    return;
	}
    }

  GTK_EDITABLE_CLASS (parent_class)->insert_text (editable, new_text,
						  new_text_length, position);
}

static void
gtk_spin_button_real_spin (GtkSpinButton *spin_button,
			   gfloat         increment)
{
  GtkAdjustment *adj;
  gfloat new_value = 0.0;

  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));
  
  adj = spin_button->adjustment;

  new_value = adj->value + increment;

  if (increment > 0)
    {
      if (spin_button->wrap)
	{
	  if (fabs (adj->value - adj->upper) < EPSILON)
	    new_value = adj->lower;
	  else if (new_value > adj->upper)
	    new_value = adj->upper;
	}
      else
	new_value = MIN (new_value, adj->upper);
    }
  else if (increment < 0) 
    {
      if (spin_button->wrap)
	{
	  if (fabs (adj->value - adj->lower) < EPSILON)
	    new_value = adj->upper;
	  else if (new_value < adj->lower)
	    new_value = adj->lower;
	}
      else
	new_value = MAX (new_value, adj->lower);
    }

  if (fabs (new_value - adj->value) > EPSILON)
    gtk_adjustment_set_value (adj, new_value);
}


/***********************************************************
 ***********************************************************
 ***                  Public interface                   ***
 ***********************************************************
 ***********************************************************/


void
gtk_spin_button_configure (GtkSpinButton  *spin_button,
			   GtkAdjustment  *adjustment,
			   gfloat          climb_rate,
			   guint           digits)
{
  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));
  g_return_if_fail (digits < 6);

  if (adjustment)
    gtk_spin_button_set_adjustment (spin_button, adjustment);
  else
    adjustment = spin_button->adjustment;

  spin_button->digits = digits;
  spin_button->climb_rate = climb_rate;
  gtk_adjustment_value_changed (adjustment);
}

GtkWidget *
gtk_spin_button_new (GtkAdjustment *adjustment,
		     gfloat         climb_rate,
		     guint          digits)
{
  GtkSpinButton *spin;

  if (adjustment)
    g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), NULL);
  g_return_val_if_fail (digits < 6, NULL);

  spin = gtk_type_new (GTK_TYPE_SPIN_BUTTON);

  gtk_spin_button_configure (spin, adjustment, climb_rate, digits);

  return GTK_WIDGET (spin);
}

void
gtk_spin_button_set_adjustment (GtkSpinButton *spin_button,
				GtkAdjustment *adjustment)
{
  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));

  if (spin_button->adjustment != adjustment)
    {
      if (spin_button->adjustment)
        {
          gtk_signal_disconnect_by_data (GTK_OBJECT (spin_button->adjustment),
                                         (gpointer) spin_button);
          gtk_object_unref (GTK_OBJECT (spin_button->adjustment));
        }
      spin_button->adjustment = adjustment;
      if (adjustment)
        {
          gtk_object_ref (GTK_OBJECT (adjustment));
	  gtk_object_sink (GTK_OBJECT (adjustment));
          gtk_signal_connect (GTK_OBJECT (adjustment), "value_changed",
			      (GtkSignalFunc) gtk_spin_button_value_changed,
			      (gpointer) spin_button);
        }
    }
}

GtkAdjustment *
gtk_spin_button_get_adjustment (GtkSpinButton *spin_button)
{
  g_return_val_if_fail (spin_button != NULL, NULL);
  g_return_val_if_fail (GTK_IS_SPIN_BUTTON (spin_button), NULL);

  return spin_button->adjustment;
}

void
gtk_spin_button_set_digits (GtkSpinButton *spin_button,
			    guint          digits)
{
  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));
  g_return_if_fail (digits < 6);

  if (spin_button->digits != digits)
    {
      spin_button->digits = digits;
      gtk_spin_button_value_changed (spin_button->adjustment, spin_button);
    }
}

gfloat
gtk_spin_button_get_value_as_float (GtkSpinButton *spin_button)
{
  g_return_val_if_fail (spin_button != NULL, 0.0);
  g_return_val_if_fail (GTK_IS_SPIN_BUTTON (spin_button), 0.0);

  return spin_button->adjustment->value;
}

gint
gtk_spin_button_get_value_as_int (GtkSpinButton *spin_button)
{
  gfloat val;

  g_return_val_if_fail (spin_button != NULL, 0);
  g_return_val_if_fail (GTK_IS_SPIN_BUTTON (spin_button), 0);

  val = spin_button->adjustment->value;
  if (val - floor (val) < ceil (val) - val)
    return floor (val);
  else
    return ceil (val);
}

void 
gtk_spin_button_set_value (GtkSpinButton *spin_button, 
			   gfloat         value)
{
  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));

  if (fabs (value - spin_button->adjustment->value) > EPSILON)
    gtk_adjustment_set_value (spin_button->adjustment, value);
  else
    {
      char buf[MAX_TEXT_LENGTH];

      sprintf (buf, "%0.*f", spin_button->digits, 
               spin_button->adjustment->value);
      if (strcmp (buf, gtk_entry_get_text (GTK_ENTRY (spin_button))))
        gtk_entry_set_text (GTK_ENTRY (spin_button), buf);
    }
}

void
gtk_spin_button_set_update_policy (GtkSpinButton             *spin_button,
				   GtkSpinButtonUpdatePolicy  policy)
{
  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));

  spin_button->update_policy = policy;
}

void
gtk_spin_button_set_numeric (GtkSpinButton  *spin_button,
			     gboolean        numeric)
{
  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));

  spin_button->numeric = (numeric != 0);
}

void
gtk_spin_button_set_wrap (GtkSpinButton  *spin_button,
			  gboolean        wrap)
{
  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));

  spin_button->wrap = (wrap != 0);
}

void
gtk_spin_button_set_shadow_type (GtkSpinButton *spin_button,
				 GtkShadowType  shadow_type)
{
  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));

  if (shadow_type != spin_button->shadow_type)
    {
      spin_button->shadow_type = shadow_type;
      if (GTK_WIDGET_DRAWABLE (spin_button))
	gtk_widget_queue_draw (GTK_WIDGET (spin_button));
    }
}

void
gtk_spin_button_set_snap_to_ticks (GtkSpinButton *spin_button,
				   gboolean       snap_to_ticks)
{
  guint new_val;

  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));

  new_val = (snap_to_ticks != 0);

  if (new_val != spin_button->snap_to_ticks)
    {
      spin_button->snap_to_ticks = new_val;
      if (new_val)
	{
	  gchar *error = NULL;
	  gfloat val;

	  val = strtod (gtk_entry_get_text (GTK_ENTRY (spin_button)), &error);
	  gtk_spin_button_snap (spin_button, val);
	}
    }
}

void
gtk_spin_button_spin (GtkSpinButton *spin_button,
		      GtkSpinType    direction,
		      gfloat         increment)
{
  GtkAdjustment *adj;
  gfloat diff;

  g_return_if_fail (spin_button != NULL);
  g_return_if_fail (GTK_IS_SPIN_BUTTON (spin_button));
  
  adj = spin_button->adjustment;

  /* for compatibility with the 1.0.x version of this function */
  if (increment != 0 && increment != adj->step_increment &&
      (direction == GTK_SPIN_STEP_FORWARD ||
       direction == GTK_SPIN_STEP_BACKWARD))
    {
      if (direction == GTK_SPIN_STEP_BACKWARD && increment > 0)
	increment = -increment;
      direction = GTK_SPIN_USER_DEFINED;
    }

  switch (direction)
    {
    case GTK_SPIN_STEP_FORWARD:

      gtk_spin_button_real_spin (spin_button, adj->step_increment);
      break;

    case GTK_SPIN_STEP_BACKWARD:

      gtk_spin_button_real_spin (spin_button, -adj->step_increment);
      break;

    case GTK_SPIN_PAGE_FORWARD:

      gtk_spin_button_real_spin (spin_button, adj->page_increment);
      break;

    case GTK_SPIN_PAGE_BACKWARD:

      gtk_spin_button_real_spin (spin_button, -adj->page_increment);
      break;

    case GTK_SPIN_HOME:

      diff = adj->value - adj->lower;
      if (diff > EPSILON)
	gtk_spin_button_real_spin (spin_button, -diff);
      break;

    case GTK_SPIN_END:

      diff = adj->upper - adj->value;
      if (diff > EPSILON)
	gtk_spin_button_real_spin (spin_button, diff);
      break;

    case GTK_SPIN_USER_DEFINED:

      if (increment != 0)
	gtk_spin_button_real_spin (spin_button, increment);
      break;

    default:
      break;
    }
}