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#pragma once
#include "pre.hpp"
#include <optional>
#include <vector>
#include "system_headers.hpp"
#include "base.hpp"
#include "ui/ui_base.hpp"
namespace cru::ui::render
{
struct MeasureConstraint
{
std::optional<float> min_width;
std::optional<float> min_height;
std::optional<float> max_width;
std::optional<float> max_height;
};
struct LayoutConstraint
{
float preferred_width;
float preferred_height;
};
struct IRenderHost : Interface
{
virtual void InvalidatePaint() = 0;
virtual void InvalidateLayout() = 0;
};
// features:
// 1. tree
// 2. layout
// 3. paint
// 3. hit test
class RenderObject : public Object
{
protected:
RenderObject() = default;
public:
RenderObject(const RenderObject& other) = delete;
RenderObject(RenderObject&& other) = delete;
RenderObject& operator=(const RenderObject& other) = delete;
RenderObject& operator=(RenderObject&& other) = delete;
~RenderObject() override = default;
IRenderHost* GetRenderHost() const { return render_host_; }
void SetRenderHost(IRenderHost* new_render_host);
RenderObject* GetParent() const { return parent_; }
const std::vector<RenderObject*>& GetChildren() const { return children_; }
void AddChild(RenderObject* render_object, int position);
void RemoveChild(int position);
virtual void Measure(const MeasureConstraint& constraint) = 0;
virtual void Layout(const LayoutConstraint& constraint) = 0;
virtual void Draw(ID2D1RenderTarget* render_target) = 0;
virtual void HitTest(const Point& point) = 0;
protected:
virtual void OnRenderHostChanged(IRenderHost* old_render_host,
IRenderHost* new_render_host);
void InvalidateRenderHostPaint() const;
void InvalidateRenderHostLayout() const;
virtual void OnParentChanged(RenderObject* old_parent,
RenderObject* new_parent);
virtual void OnAddChild(RenderObject* new_child, int position);
virtual void OnRemoveChild(RenderObject* removed_child, int position);
private:
void SetParent(RenderObject* new_parent);
private:
IRenderHost* render_host_ = nullptr;
RenderObject* parent_ = nullptr;
std::vector<RenderObject*> children_;
};
class LinearLayoutRenderObject : public RenderObject
{
public:
LinearLayoutRenderObject() = default;
LinearLayoutRenderObject(const LinearLayoutRenderObject& other) = delete;
LinearLayoutRenderObject& operator=(const LinearLayoutRenderObject& other) =
delete;
LinearLayoutRenderObject(LinearLayoutRenderObject&& other) = delete;
LinearLayoutRenderObject& operator=(LinearLayoutRenderObject&& other) =
delete;
~LinearLayoutRenderObject() = default;
void Measure(const MeasureConstraint& constraint) override;
private:
};
} // namespace cru::ui::render
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