* _gtk_range_get_wheel_delta:
* @range: a #GtkRange
* @event: A #GdkEventScroll
- *
+ *
* Returns a good step value for the mouse wheel.
- *
- * Return value: A good step value for the mouse wheel.
- *
+ *
+ * Return value: A good step value for the mouse wheel.
+ *
* Since: 2.4
**/
gdouble
gdouble dx, dy;
gdouble delta;
gdouble page_size;
- gdouble size;
+ gdouble page_increment;
+ gdouble scroll_unit;
page_size = gtk_adjustment_get_page_size (adjustment);
+ page_increment = gtk_adjustment_get_page_increment (adjustment);
+
+ if (GTK_IS_SCROLLBAR (range))
+ scroll_unit = pow (page_size, 2.0 / 3.0);
+ else
+ scroll_unit = page_increment;
if (gdk_event_get_scroll_deltas ((GdkEvent *) event, &dx, &dy))
{
- GtkAllocation allocation;
-
- gtk_widget_get_allocation (GTK_WIDGET (range), &allocation);
-
- if (gtk_orientable_get_orientation (GTK_ORIENTABLE (range)) == GTK_ORIENTATION_HORIZONTAL)
- size = allocation.width;
- else
- size = allocation.height;
-
if (dx != 0 &&
gtk_orientable_get_orientation (GTK_ORIENTABLE (range)) == GTK_ORIENTATION_HORIZONTAL)
- {
- if (GTK_IS_SCROLLBAR (range) && page_size > 0)
- delta = dx * page_size / size;
- else
- delta = dx * (gtk_adjustment_get_upper (adjustment) -
- gtk_adjustment_get_lower (adjustment)) / size;
- }
+ delta = dx * scroll_unit;
else
- {
- if (GTK_IS_SCROLLBAR (range) && page_size > 0)
- delta = dy * page_size / size;
- else
- delta = dy * (gtk_adjustment_get_upper (adjustment) -
- gtk_adjustment_get_lower (adjustment)) / size;
- }
+ delta = dy * scroll_unit;
}
else
{
- if (GTK_IS_SCROLLBAR (range))
- delta = pow (page_size, 2.0 / 3.0);
- else
- delta = gtk_adjustment_get_page_increment (adjustment) * 2;
-
if (event->direction == GDK_SCROLL_UP ||
event->direction == GDK_SCROLL_LEFT)
- delta = - delta;
+ delta = - scroll_unit;
+ else
+ delta = scroll_unit;
}
if (priv->inverted)