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range: Straighten the wheel delta calculation

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Scroll events report normalized deltas in terms of an abstract
'scroll unit' now, so our job is to determine a suitable scroll
unit here. Since we are changing the value of the adjustment,
the allocation of the widget does not factor into this at all.
This commit is contained in:
Matthias Clasen 2012-03-04 19:15:32 -05:00
parent 3dd5e88c07
commit 5714454a73
1 changed files with 17 additions and 34 deletions
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51
gtk/gtkrange.c
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@ -2788,11 +2788,11 @@ gtk_range_button_release (GtkWidget *widget,
* _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
@ -2804,49 +2804,32 @@ _gtk_range_get_wheel_delta (GtkRange *range,
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)