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#pragma once
#include "LayoutRenderObject.h"
namespace cru::ui::render {
struct StackChildLayoutData {
std::optional<Alignment> horizontal;
std::optional<Alignment> vertical;
};
// Measure Logic:
// Following rules are applied both horizontally and vertically.
//
// 1. Measure each children with min size not specified and max size as
// following rules:
//
// 1.1. If parent's preferred size is set and it is not less than child's min
// size, then it is used as child's max size.
//
// 1.2. Or if parent's max size is set, then it is used as child's max size.
// If it is less than child's min size, then log an warning about that.
//
// 2. Result size is children's max size.
//
// 3. If preferred size is specified and result size is smaller than it, coerce
// result size to preferred size.
//
// 4. If result size is smaller than min size (if specified), coerce result size
// to min size.
class CRU_UI_API StackLayoutRenderObject
: public LayoutRenderObject<StackChildLayoutData> {
CRU_DEFINE_CLASS_LOG_TAG(u"StackLayoutRenderObject")
public:
StackLayoutRenderObject() = default;
CRU_DELETE_COPY(StackLayoutRenderObject)
CRU_DELETE_MOVE(StackLayoutRenderObject)
~StackLayoutRenderObject() = default;
String GetName() const override { return u"StackLayoutRenderObject"; }
Alignment GetDefaultHorizontalAlignment() const {
return default_vertical_alignment_;
}
void SetDefaultHorizontalAlignment(Alignment alignment);
Alignment GetDefaultVerticalAlignment() {
return default_horizontal_alignment_;
}
void SetDefaultVertialAlignment(Alignment alignment);
protected:
Size OnMeasureContent(const MeasureRequirement& requirement,
const MeasureSize& preferred_size) override;
void OnLayoutContent(const Rect& content_rect) override;
private:
Alignment default_horizontal_alignment_ = Alignment::Start;
Alignment default_vertical_alignment_ = Alignment::Start;
};
} // namespace cru::ui::render
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