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LibGUI: Add Widget shrink-to-fit layout flag

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If this flag is enabled for a widget, it will be automatically sized
based on its children. This only works for widgets using a layout.

This allows you to put widgets inside each other without having to
manually calculate how large the container should be. It's not the
perfect API but it's a decent progression in ergonomics. :^)
This commit is contained in:
Andreas Kling 2021-01-04 18:17:14 +01:00
parent ce7b09a3c5
commit b03e1b08b5
Notes: sideshowbarker 2024-07-19 00:07:53 +09:00
5 changed files with 90 additions and 0 deletions
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70
Libraries/LibGUI/BoxLayout.cpp
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@ -44,6 +44,70 @@ BoxLayout::BoxLayout(Orientation orientation)
"orientation", [this] { return m_orientation == Gfx::Orientation::Vertical ? "Vertical" : "Horizontal"; }, nullptr);
}
Gfx::IntSize BoxLayout::preferred_size() const
{
Gfx::IntSize size;
size.set_primary_size_for_orientation(orientation(), preferred_primary_size());
size.set_secondary_size_for_orientation(orientation(), preferred_secondary_size());
return size;
}
int BoxLayout::preferred_primary_size() const
{
int size = 0;
for (auto& entry : m_entries) {
if (!entry.widget)
continue;
int min_size = entry.widget->min_size().primary_size_for_orientation(orientation());
int max_size = entry.widget->max_size().primary_size_for_orientation(orientation());
int preferred_primary_size = -1;
if (entry.widget->is_shrink_to_fit() && entry.widget->layout()) {
preferred_primary_size = entry.widget->layout()->preferred_size().primary_size_for_orientation(orientation());
}
int item_size = max(0, preferred_primary_size);
item_size = max(min_size, item_size);
item_size = min(max_size, item_size);
size += item_size + spacing();
}
if (size > 0)
size -= spacing();
if (orientation() == Gfx::Orientation::Horizontal)
size += margins().left() + margins().right();
else
size += margins().top() + margins().bottom();
if (!size)
return -1;
return size;
}
int BoxLayout::preferred_secondary_size() const
{
int size = 0;
for (auto& entry : m_entries) {
if (!entry.widget)
continue;
int min_size = entry.widget->min_size().secondary_size_for_orientation(orientation());
int preferred_secondary_size = -1;
if (entry.widget->is_shrink_to_fit() && entry.widget->layout()) {
preferred_secondary_size = entry.widget->layout()->preferred_size().secondary_size_for_orientation(orientation());
size = max(size, preferred_secondary_size);
}
size = max(min_size, size);
}
if (orientation() == Gfx::Orientation::Horizontal)
size += margins().top() + margins().bottom();
else
size += margins().left() + margins().right();
if (!size)
return -1;
return size;
}
void BoxLayout::run(Widget& widget)
{
if (m_entries.is_empty())
@ -71,6 +135,12 @@ void BoxLayout::run(Widget& widget)
continue;
auto min_size = entry.widget->min_size();
auto max_size = entry.widget->max_size();
if (entry.widget->is_shrink_to_fit() && entry.widget->layout()) {
auto preferred_size = entry.widget->layout()->preferred_size();
min_size = max_size = preferred_size;
}
items.append(Item { entry.widget.ptr(), min_size.primary_size_for_orientation(orientation()), max_size.primary_size_for_orientation(orientation()) });
}