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libgimpwidgets: improve gimp_scroll_adjustment_values()

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so it works for very small adjustment page sizes. Same as GTK+ commit
c0ba041c73214f82d2c32b2ca1fa8f3c388c6170
This commit is contained in:
Michael Natterer 2018-06-13 15:20:21 +02:00
parent e490aa8393
commit 8d66e7eaa1
1 changed files with 12 additions and 2 deletions
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14
libgimpwidgets/gimpscrolledpreview.c
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@ -966,12 +966,22 @@ gimp_scroll_adjustment_values (GdkEventScroll *sevent,
}
if (adj_x)
scroll_unit_x = pow (gtk_adjustment_get_page_size (adj_x), 2.0 / 3.0);
{
gdouble page_size = gtk_adjustment_get_page_size (adj_x);
gdouble pow_unit = pow (page_size, 2.0 / 3.0);
scroll_unit_x = MIN (page_size / 2.0, pow_unit);
}
else
scroll_unit_x = 1.0;
if (adj_y)
scroll_unit_y = pow (gtk_adjustment_get_page_size (adj_y), 2.0 / 3.0);
{
gdouble page_size = gtk_adjustment_get_page_size (adj_y);
gdouble pow_unit = pow (page_size, 2.0 / 3.0);
scroll_unit_y = MIN (page_size / 2.0, pow_unit);
}
else
scroll_unit_y = 1.0;