62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
#include <psemek/ui/impl/frame_base.hpp>
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#include <psemek/react/join.hpp>
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#include <psemek/react/map.hpp>
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namespace psemek::ui::impl
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{
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namespace
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{
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size_constraints compute_size_constraints(size_constraints const & child_size_constraints, float margin)
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{
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return { child_size_constraints.box + geom::vector{2.f * margin, 2.f * margin} };
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}
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geom::box<float, 2> compute_child_shape(geom::box<float, 2> const & shape, float margin)
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{
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return geom::expand(shape, -margin);
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}
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}
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frame_base::frame_base()
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: margin_(0.f)
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, child_size_constraints_(size_constraints::max())
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, size_constraints_(react::map(compute_size_constraints, react::join(child_size_constraints_), react::join(margin_)))
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{}
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void frame_base::reshape(geom::box<float, 2> const & new_shape)
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{
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single_container::reshape(new_shape);
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if (auto child = this->child())
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child->reshape(compute_child_shape(new_shape, **margin_));
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}
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react::value<struct size_constraints> frame_base::size_constraints() const
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{
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return size_constraints_;
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}
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void frame_base::set_child(std::unique_ptr<component> child)
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{
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if (child)
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child_size_constraints_.set(child->size_constraints());
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else
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child_size_constraints_.set(size_constraints::max());
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single_container::set_child(std::move(child));
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}
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std::unique_ptr<component> frame_base::release_child()
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{
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child_size_constraints_.set(size_constraints::max());
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return single_container::release_child();
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}
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void frame_base::update(frame const & value)
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{
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margin_.set(value.margin);
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}
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}
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