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#pragma once
#include "render_object.hpp"
#include <optional>
namespace cru::ui::render {
enum class FlexDirection {
Horizontal,
HorizontalReverse,
Vertical,
VertivalReverse
};
namespace internal {
constexpr int align_start = 0;
constexpr int align_end = align_start + 1;
constexpr int align_center = align_end + 1;
// constexpr int align_stretch = align_center + 1;
} // namespace internal
enum class FlexMainAlignment {
Start = internal::align_start,
End = internal::align_end,
Center = internal::align_center
};
enum class FlexCrossAlignment {
Start = internal::align_start,
End = internal::align_end,
Center = internal::align_center,
// Stretch = internal::align_stretch
};
struct FlexChildLayoutData {
// nullopt stands for looking at my content
std::optional<float> flex_basis = std::nullopt;
float flex_grow = 0;
float flex_shrink = 0;
// nullopt stands for looking at parent's setting
std::optional<FlexCrossAlignment> cross_alignment = std::nullopt;
};
class FlexLayoutRenderObject : public RenderObject {
public:
FlexLayoutRenderObject();
FlexLayoutRenderObject(const FlexLayoutRenderObject& other) = delete;
FlexLayoutRenderObject& operator=(const FlexLayoutRenderObject& other) =
delete;
FlexLayoutRenderObject(FlexLayoutRenderObject&& other) = delete;
FlexLayoutRenderObject& operator=(FlexLayoutRenderObject&& other) = delete;
~FlexLayoutRenderObject() override = default;
FlexDirection GetFlexDirection() const { return direction_; }
void SetFlexDirection(FlexDirection direction) {
direction_ = direction;
InvalidateLayout();
}
FlexMainAlignment GetContentMainAlign() const { return content_main_align_; }
void SetContentMainAlign(FlexMainAlignment align) {
content_main_align_ = align;
InvalidateLayout();
}
FlexCrossAlignment GetItemCrossAlign() const { return item_cross_align_; }
void SetItemCrossAlign(FlexCrossAlignment align) {
item_cross_align_ = align;
InvalidateLayout();
}
FlexChildLayoutData GetChildLayoutData(int position) {
assert(position >= 0 && position < child_layout_data_.size());
return child_layout_data_[position];
}
void SetChildLayoutData(int position, const FlexChildLayoutData& data) {
assert(position >= 0 && position < child_layout_data_.size());
child_layout_data_[position] = data;
InvalidateLayout();
}
void Draw(platform::graph::Painter* painter) override;
RenderObject* HitTest(const Point& point) override;
protected:
void OnAddChild(RenderObject* new_child, int position) override;
void OnRemoveChild(RenderObject* removed_child, int position) override;
Size OnMeasureContent(const Size& available_size) override;
void OnLayoutContent(const Rect& content_rect) override;
private:
FlexDirection direction_ = FlexDirection::Horizontal;
FlexMainAlignment content_main_align_ = FlexMainAlignment::Start;
FlexCrossAlignment item_cross_align_ = FlexCrossAlignment::Center;
std::vector<FlexChildLayoutData> child_layout_data_{};
};
} // namespace cru::ui::render
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