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#include "cru/ui/render/stack_layout_render_object.hpp"
#include <algorithm>
namespace cru::ui::render {
Size StackLayoutRenderObject::OnMeasureContent(const Size& available_size) {
auto size = Size{};
for (const auto child : GetChildren()) {
child->Measure(available_size);
const auto& preferred_size = child->GetPreferredSize();
size.width = std::max(size.width, preferred_size.width);
size.height = std::max(size.height, preferred_size.height);
}
return size;
}
void StackLayoutRenderObject::OnLayoutContent(const Rect& rect) {
auto calculate_anchor = [](int alignment, float start_point,
float total_length,
float content_length) -> float {
switch (alignment) {
case internal::align_start:
return start_point;
case internal::align_center:
return start_point + (total_length - content_length) / 2.0f;
case internal::align_end:
return start_point + total_length - content_length;
default:
return 0;
}
};
const auto count = GetChildCount();
const auto& children = GetChildren();
for (int i = 0; i < count; i++) {
const auto layout_data = GetChildLayoutData(i);
const auto child = children[i];
const auto& size = child->GetPreferredSize();
child->Layout(
Rect{calculate_anchor(static_cast<int>(layout_data->horizontal),
rect.left, rect.width, size.width),
calculate_anchor(static_cast<int>(layout_data->vertical), rect.top,
rect.height, size.height),
size.width, size.height});
}
}
} // namespace cru::ui::render
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