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Fix pane allocation and size constraints

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Correctly divide the fractions of *available* requested child-space.

This fixes issue with Trigger Page bottom attachment not showing
Frame content.

When calculating constraints the divider width/height was ignored.
When setting child allocation, the divider girth was only
subtracted *after* the first child, and iteratively subtracted
after each subsequent child widget.
This over-allocated the first child and later child widgets
were increasingly too small (factor * remaining).
This commit is contained in:
Robin Gareus 2025-10-11 21:04:45 +02:00
parent b1841f9857
commit 882ed91f2f
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GPG key ID: A090BCE02CF57F04
1 changed files with 4 additions and 5 deletions
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9
libs/widgets/pane.cc
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@ -257,6 +257,7 @@ Pane::reallocate (Gtk::Allocation const & alloc)
} else {
remaining = alloc.get_height ();
}
remaining = max<int> (0, remaining - (children.size() - 1) * divider_width);
Children::iterator child;
Children::iterator next;
@ -298,8 +299,6 @@ Pane::reallocate (Gtk::Allocation const & alloc)
fract = (*div)->fract;
}
Gtk::Requisition cr = (*child)->w->size_request ();
if (horizontal) {
child_alloc.set_width ((gint) floor (remaining * fract));
child_alloc.set_height (alloc.get_height());
@ -319,6 +318,7 @@ Pane::reallocate (Gtk::Allocation const & alloc)
child_alloc.set_height (max (child_alloc.get_height(), (*child)->minsize));
}
} else if (!check_fract && (*child)->w->get_visible ()) {
Gtk::Requisition cr = (*child)->w->size_request ();
if (horizontal) {
child_alloc.set_width (max (child_alloc.get_width(), cr.width));
} else {
@ -347,12 +347,10 @@ Pane::reallocate (Gtk::Allocation const & alloc)
if (horizontal) {
divider_allocation.set_width (divider_width);
divider_allocation.set_height (alloc.get_height());
remaining = max (0, remaining - divider_width);
xpos += divider_width;
} else {
divider_allocation.set_width (alloc.get_width());
divider_allocation.set_height (divider_width);
remaining = max (0, remaining - divider_width);
ypos += divider_width;
}
@ -433,7 +431,8 @@ Pane::constrain_fract (Dividers::size_type div, float fract)
if (children.size () <= div + 1) { return fract; } // XXX remove once hidden divs are skipped
assert(children.size () > div + 1);
const float size = horizontal ? get_allocation().get_width() : get_allocation().get_height();
float size = horizontal ? get_allocation().get_width() : get_allocation().get_height();
size = max<float> (0, size - (children.size() - 1) * divider_width);
// TODO: optimize: cache in Pane::on_size_request
Gtk::Requisition prev_req(children.at (div)->w->size_request ());