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grid: Work harder for tight homogeneous allocation

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When doing homogeneous allocation in the presence of
overlapping spanning children, we need to avoid uneven
line allocations, otherwise, the final homogenization
will blow up the size request of the grid.

https://bugzilla.gnome.org/show_bug.cgi?id=671170
This commit is contained in:
Matthias Clasen 2012-03-04 17:19:16 -05:00
parent 897dc37289
commit 47c190a1b7
1 changed files with 53 additions and 18 deletions
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71
gtk/gtkgrid.c
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@ -770,37 +770,72 @@ gtk_grid_request_spanning (GtkGridRequest *request,
/* If we need to request more space for this child to fill
* its requisition, then divide up the needed space amongst the
* lines it spans, favoring expandable lines if any.
*
* When doing homogeneous allocation though, try to keep the
* line allocations even, since we're going to force them to
* be the same anyway, and we don't want to introduce unnecessary
* extra space.
*/
if (span_minimum < minimum)
{
extra = minimum - span_minimum;
expand = span_expand;
for (i = 0; i < attach->span; i++)
if (linedata->homogeneous)
{
line = &lines->lines[attach->pos - lines->min + i];
if (force_expand || line->expand)
gint total, m;
total = minimum - (attach->span - 1) * linedata->spacing;
m = total / attach->span + (total % attach->span ? 1 : 0);
for (i = 0; i < attach->span; i++)
{
line_extra = extra / expand;
line->minimum += line_extra;
extra -= line_extra;
expand -= 1;
line = &lines->lines[attach->pos - lines->min + i];
line->minimum = MAX(line->minimum, m);
}
}
else
{
extra = minimum - span_minimum;
expand = span_expand;
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
if (force_expand || line->expand)
{
line_extra = extra / expand;
line->minimum += line_extra;
extra -= line_extra;
expand -= 1;
}
}
}
}
if (span_natural < natural)
{
extra = natural - span_natural;
expand = span_expand;
for (i = 0; i < attach->span; i++)
if (linedata->homogeneous)
{
line = &lines->lines[attach->pos - lines->min + i];
if (force_expand || line->expand)
gint total, n;
total = natural - (attach->span - 1) * linedata->spacing;
n = total / attach->span + (total % attach->span ? 1 : 0);
for (i = 0; i < attach->span; i++)
{
line_extra = extra / expand;
line->natural += line_extra;
extra -= line_extra;
expand -= 1;
line = &lines->lines[attach->pos - lines->min + i];
line->natural = MAX(line->natural, n);
}
}
else
{
extra = natural - span_natural;
expand = span_expand;
for (i = 0; i < attach->span; i++)
{
line = &lines->lines[attach->pos - lines->min + i];
if (force_expand || line->expand)
{
line_extra = extra / expand;
line->natural += line_extra;
extra -= line_extra;
expand -= 1;
}
}
}
}