/**
* st_adjustment_get_values:
* @adjustment: an #StAdjustment
* @value: (out): the current value
* @lower: (out): the lower bound
* @upper: (out): the upper bound
* @step_increment: (out): the step increment
* @page_increment: (out): the page increment
* @page_size: (out): the page size
*
* Gets all of @adjustment's values at once.
*/
void
st_adjustment_get_values (StAdjustment *adjustment,
gdouble *value,
gdouble *lower,
gdouble *upper,
gdouble *step_increment,
gdouble *page_increment,
gdouble *page_size)
{
StAdjustmentPrivate *priv;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
priv = st_adjustment_get_instance_private (adjustment);
if (lower)
*lower = priv->lower;
if (upper)
*upper = priv->upper;
if (value)
*value = st_adjustment_get_value (adjustment);
if (step_increment)
*step_increment = priv->step_increment;
if (page_increment)
*page_increment = priv->page_increment;
if (page_size)
*page_size = priv->page_size;
}
void
st_adjustment_clamp_page (StAdjustment *adjustment,
gdouble lower,
gdouble upper)
{
StAdjustmentPrivate *priv;
gboolean changed;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
priv = st_adjustment_get_instance_private (adjustment);
lower = CLAMP (lower, priv->lower, priv->upper - priv->page_size);
upper = CLAMP (upper, priv->lower + priv->page_size, priv->upper);
changed = FALSE;
if (priv->value + priv->page_size > upper)
{
priv->value = upper - priv->page_size;
changed = TRUE;
}
if (priv->value < lower)
{
priv->value = lower;
changed = TRUE;
}
if (changed)
g_object_notify (G_OBJECT (adjustment), "value");
}
void
st_adjustment_set_value (StAdjustment *adjustment,
gdouble value)
{
StAdjustmentPrivate *priv;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
priv = st_adjustment_get_instance_private (adjustment);
/* Defer clamp until after construction. */
if (!priv->is_constructing)
{
value = CLAMP (value,
priv->lower,
MAX (priv->lower, priv->upper - priv->page_size));
}
if (priv->value != value)
{
priv->value = value;
g_object_notify (G_OBJECT (adjustment), "value");
}
}
gdouble
st_adjustment_get_value (StAdjustment *adjustment)
{
g_return_val_if_fail (ST_IS_ADJUSTMENT (adjustment), 0);
return ((StAdjustmentPrivate *)st_adjustment_get_instance_private (adjustment))->value;
}
gdouble
st_adjustment_get_value (StAdjustment *adjustment)
{
StAdjustmentPrivate *priv;
g_return_val_if_fail (ST_IS_ADJUSTMENT (adjustment), 0);
priv = adjustment->priv;
return priv->value;
}
/**
* st_adjustment_adjust_for_scroll_event:
* @adjustment: An #StAdjustment
* @delta: A delta, retrieved directly from clutter_event_get_scroll_delta()
* or similar.
*
* Adjusts the adjustment using delta values from a scroll event.
* You should use this instead of using st_adjustment_set_value()
* as this method will tweak the values directly using the same
* math as GTK+, to ensure that scrolling is consistent across
* the environment.
*/
void
st_adjustment_adjust_for_scroll_event (StAdjustment *adjustment,
gdouble delta)
{
StAdjustmentPrivate *priv;
gdouble new_value, scroll_unit;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
priv = st_adjustment_get_instance_private (adjustment);
scroll_unit = pow (priv->page_size, 2.0 / 3.0);
new_value = priv->value + delta * scroll_unit;
st_adjustment_set_value (adjustment, new_value);
}
void
st_adjustment_set_values (StAdjustment *adjustment,
gdouble value,
gdouble lower,
gdouble upper,
gdouble step_increment,
gdouble page_increment,
gdouble page_size)
{
StAdjustmentPrivate *priv;
gboolean emit_changed = FALSE;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
g_return_if_fail (page_size >= 0 && page_size <= G_MAXDOUBLE);
g_return_if_fail (step_increment >= 0 && step_increment <= G_MAXDOUBLE);
g_return_if_fail (page_increment >= 0 && page_increment <= G_MAXDOUBLE);
priv = st_adjustment_get_instance_private (adjustment);
emit_changed = FALSE;
g_object_freeze_notify (G_OBJECT (adjustment));
emit_changed |= st_adjustment_set_lower (adjustment, lower);
emit_changed |= st_adjustment_set_upper (adjustment, upper);
emit_changed |= st_adjustment_set_step_increment (adjustment, step_increment);
emit_changed |= st_adjustment_set_page_increment (adjustment, page_increment);
emit_changed |= st_adjustment_set_page_size (adjustment, page_size);
if (value != priv->value)
{
st_adjustment_set_value (adjustment, value);
emit_changed = TRUE;
}
if (emit_changed)
g_signal_emit (G_OBJECT (adjustment), signals[CHANGED], 0);
g_object_thaw_notify (G_OBJECT (adjustment));
}
