2 files changed, 355 insertions, 0 deletions
diff --git a/src/ui/render/render_object.cpp b/src/ui/render/render_object.cpp
new file mode 100644
index 00000000..0828fc9c
--- /dev/null
+++ b/src/ui/render/render_object.cpp
@@ -0,0 +1,98 @@
+#include "render_object.hpp"
+#include <utility>
+
+namespace cru::ui::render
+{
+    void RenderObject::SetRenderHost(IRenderHost* new_render_host)
+    {
+        if (new_render_host == render_host_)
+            return;
+
+        const auto old = render_host_;
+        render_host_ = new_render_host;
+        OnRenderHostChanged(old, new_render_host);
+    }
+
+    void RenderObject::OnRenderHostChanged(IRenderHost* old_render_host, IRenderHost* new_render_host)
+    {
+
+    }
+
+    void RenderObject::InvalidateRenderHost()
+    {
+        if (render_host_ != nullptr)
+            render_host_->InvalidateRender();
+    }
+
+    void StrokeRenderObject::SetStrokeWidth(const float new_stroke_width)
+    {
+        if (stroke_width_ == new_stroke_width)
+            return;
+
+        stroke_width_ = new_stroke_width;
+        InvalidateRenderHost();
+    }
+
+    void StrokeRenderObject::SetBrush(Microsoft::WRL::ComPtr<ID2D1Brush> new_brush)
+    {
+        if (brush_ == new_brush)
+            return;
+
+        brush_ = std::move(new_brush);
+        InvalidateRenderHost();
+    }
+
+    void StrokeRenderObject::SetStrokeStyle(Microsoft::WRL::ComPtr<ID2D1StrokeStyle> new_stroke_style)
+    {
+        if (stroke_style_ == new_stroke_style)
+            return;
+
+        stroke_style_ = std::move(new_stroke_style);
+        InvalidateRenderHost();
+    }
+
+    void FillRenderObject::SetBrush(Microsoft::WRL::ComPtr<ID2D1Brush> new_brush)
+    {
+        if (brush_ == new_brush)
+            return;
+
+        brush_ = std::move(new_brush);
+        InvalidateRenderHost();
+    }
+
+    namespace details
+    {
+        template class ShapeRenderObject<Rect>;
+        template class ShapeRenderObject<RoundedRect>;
+        template class ShapeRenderObject<Ellipse>;
+    }
+
+    namespace details
+    {
+        template ShapeStrokeRenderObject<Rect, D2D1_RECT_F, &ID2D1RenderTarget::DrawRectangle>;
+        template ShapeStrokeRenderObject<RoundedRect, D2D1_ROUNDED_RECT, &ID2D1RenderTarget::DrawRoundedRectangle>;
+        template ShapeStrokeRenderObject<Ellipse, D2D1_ELLIPSE, &ID2D1RenderTarget::DrawEllipse>;
+    }
+
+    namespace details
+    {
+        template ShapeFillRenderObject<Rect, D2D1_RECT_F, &ID2D1RenderTarget::FillRectangle>;
+        template ShapeFillRenderObject<RoundedRect, D2D1_ROUNDED_RECT, &ID2D1RenderTarget::FillRoundedRectangle>;
+        template ShapeFillRenderObject<Ellipse, D2D1_ELLIPSE, &ID2D1RenderTarget::FillEllipse>;
+    }
+
+    void CustomDrawHandlerRenderObject::SetDrawHandler(DrawHandler new_draw_handler)
+    {
+        if (draw_handler_ == nullptr && new_draw_handler == nullptr)
+            return;
+
+        draw_handler_ = std::move(new_draw_handler);
+        InvalidateRenderHost();
+    }
+
+    void CustomDrawHandlerRenderObject::Draw(ID2D1RenderTarget* render_target)
+    {
+        if (draw_handler_ != nullptr)
+            draw_handler_(render_target);
+    }
+}
diff --git a/src/ui/render/render_object.hpp b/src/ui/render/render_object.hpp
new file mode 100644
index 00000000..31745be5
--- /dev/null
+++ b/src/ui/render/render_object.hpp
@@ -0,0 +1,257 @@
+#pragma once
+
+#include "pre.hpp"
+
+#include "system_headers.hpp"
+#include <functional>
+#include <cassert>
+
+#include "base.hpp"
+#include "ui/ui_base.hpp"
+#include "ui/d2d_util.hpp"
+
+namespace cru::ui::render
+{
+    /* About Render Object
+     * 
+     * Render object is a concrete subclass of RenderObject class.
+     * It represents a painting action on a d2d render target. By
+     * overriding "Draw" virtual method, it can customize its painting
+     * action.
+     */
+
+
+    struct IRenderHost : Interface
+    {
+        virtual void InvalidateRender() = 0;
+    };
+
+
+    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;
+
+        virtual void Draw(ID2D1RenderTarget* render_target) = 0;
+
+        IRenderHost* GetRenderHost() const
+        {
+            return render_host_;
+        }
+
+        void SetRenderHost(IRenderHost* new_render_host);
+
+    protected:
+        virtual void OnRenderHostChanged(IRenderHost* old_render_host, IRenderHost* new_render_host);
+
+        void InvalidateRenderHost();
+
+    private:
+        IRenderHost* render_host_ = nullptr;
+    };
+
+
+    class StrokeRenderObject : public virtual RenderObject
+    {
+    protected:
+        StrokeRenderObject() = default;
+    public:
+        StrokeRenderObject(const StrokeRenderObject& other) = delete;
+        StrokeRenderObject(StrokeRenderObject&& other) = delete;
+        StrokeRenderObject& operator=(const StrokeRenderObject& other) = delete;
+        StrokeRenderObject& operator=(StrokeRenderObject&& other) = delete;
+        ~StrokeRenderObject() override = default;
+
+        float GetStrokeWidth() const
+        {
+            return stroke_width_;
+        }
+
+        void SetStrokeWidth(float new_stroke_width);
+
+        Microsoft::WRL::ComPtr<ID2D1Brush> GetBrush() const
+        {
+            return brush_;
+        }
+
+        void SetBrush(Microsoft::WRL::ComPtr<ID2D1Brush> new_brush);
+
+        Microsoft::WRL::ComPtr<ID2D1StrokeStyle> GetStrokeStyle() const
+        {
+            return stroke_style_;
+        }
+
+        void SetStrokeStyle(Microsoft::WRL::ComPtr<ID2D1StrokeStyle> new_stroke_style);
+
+    private:
+        float stroke_width_ = 1.0f;
+        Microsoft::WRL::ComPtr<ID2D1Brush> brush_ = nullptr;
+        Microsoft::WRL::ComPtr<ID2D1StrokeStyle> stroke_style_ = nullptr;
+    };
+
+
+    class FillRenderObject : public virtual RenderObject
+    {
+    protected:
+        FillRenderObject() = default;
+    public:
+        FillRenderObject(const FillRenderObject& other) = delete;
+        FillRenderObject(FillRenderObject&& other) = delete;
+        FillRenderObject& operator=(const FillRenderObject& other) = delete;
+        FillRenderObject& operator=(FillRenderObject&& other) = delete;
+        ~FillRenderObject() override = default;
+
+        Microsoft::WRL::ComPtr<ID2D1Brush> GetBrush() const
+        {
+            return brush_;
+        }
+
+        void SetBrush(Microsoft::WRL::ComPtr<ID2D1Brush> new_brush);
+
+    private:
+        Microsoft::WRL::ComPtr<ID2D1Brush> brush_ = nullptr;
+    };
+
+
+    namespace details
+    {
+        template <typename TShapeType>
+        class ShapeRenderObject : public virtual RenderObject
+        {
+        public:
+            using ShapeType = TShapeType;
+        protected:
+            ShapeRenderObject() = default;
+        public:
+            ShapeRenderObject(const ShapeRenderObject& other) = delete;
+            ShapeRenderObject& operator=(const ShapeRenderObject& other) = delete;
+            ShapeRenderObject(ShapeRenderObject&& other) = delete;
+            ShapeRenderObject& operator=(ShapeRenderObject&& other) = delete;
+            ~ShapeRenderObject() override = default;
+
+            ShapeType GetShape() const
+            {
+                return shape_;
+            }
+
+            void SetShape(const ShapeType& new_shape)
+            {
+                if (new_shape == shape_)
+                    return;
+
+                shape_ = new_shape;
+                InvalidateRenderHost();
+            }
+
+        private:
+            ShapeType shape_;
+        };
+
+
+        extern template class ShapeRenderObject<Rect>;
+        extern template class ShapeRenderObject<RoundedRect>;
+        extern template class ShapeRenderObject<Ellipse>;
+    }
+
+
+    using RectangleRenderObject = details::ShapeRenderObject<Rect>;
+    using RoundedRectangleRenderObject = details::ShapeRenderObject<RoundedRect>;
+    using EllipseRenderObject = details::ShapeRenderObject<Ellipse>;
+
+
+    namespace details
+    {
+        template<typename TShapeType, typename TD2D1ShapeType, void (ID2D1RenderTarget::*draw_function)(const TD2D1ShapeType&, ID2D1Brush*, float, ID2D1StrokeStyle*)>
+        class ShapeStrokeRenderObject : public ShapeRenderObject<TShapeType>, public StrokeRenderObject
+        {
+        public:
+            ShapeStrokeRenderObject() = default;
+            ShapeStrokeRenderObject(const ShapeStrokeRenderObject& other) = delete;
+            ShapeStrokeRenderObject& operator=(const ShapeStrokeRenderObject& other) = delete;
+            ShapeStrokeRenderObject(ShapeStrokeRenderObject&& other) = delete;
+            ShapeStrokeRenderObject& operator=(ShapeStrokeRenderObject&& other) = delete;
+            ~ShapeStrokeRenderObject() = default;
+
+        protected:
+            void Draw(ID2D1RenderTarget* render_target) override
+            {
+                const auto brush = GetBrush();
+                if (brush != nullptr)
+                    (render_target->*draw_function)(Convert(GetShape()), brush.Get(), GetStrokeWidth(), GetStrokeStyle().Get());
+            }
+        };
+
+        extern template ShapeStrokeRenderObject<Rect, D2D1_RECT_F, &ID2D1RenderTarget::DrawRectangle>;
+        extern template ShapeStrokeRenderObject<RoundedRect, D2D1_ROUNDED_RECT, &ID2D1RenderTarget::DrawRoundedRectangle>;
+        extern template ShapeStrokeRenderObject<Ellipse, D2D1_ELLIPSE, &ID2D1RenderTarget::DrawEllipse>;
+    }
+
+    using RectangleStrokeRenderObject = details::ShapeStrokeRenderObject<Rect, D2D1_RECT_F, &ID2D1RenderTarget::DrawRectangle>;
+    using RoundedRectangleStrokeRenderObject = details::ShapeStrokeRenderObject<RoundedRect, D2D1_ROUNDED_RECT, &ID2D1RenderTarget::DrawRoundedRectangle>;
+    using EllipseStrokeRenderObject = details::ShapeStrokeRenderObject<Ellipse, D2D1_ELLIPSE, &ID2D1RenderTarget::DrawEllipse>;
+
+
+    namespace details
+    {
+        template<typename TShapeType, typename TD2D1ShapeType, void (ID2D1RenderTarget::*fill_function)(const TD2D1ShapeType&, ID2D1Brush*)>
+        class ShapeFillRenderObject : public ShapeRenderObject<TShapeType>, public StrokeRenderObject
+        {
+        public:
+            ShapeFillRenderObject() = default;
+            ShapeFillRenderObject(const ShapeFillRenderObject& other) = delete;
+            ShapeFillRenderObject& operator=(const ShapeFillRenderObject& other) = delete;
+            ShapeFillRenderObject(ShapeFillRenderObject&& other) = delete;
+            ShapeFillRenderObject& operator=(ShapeFillRenderObject&& other) = delete;
+            ~ShapeFillRenderObject() = default;
+
+        protected:
+            void Draw(ID2D1RenderTarget* render_target) override
+            {
+                const auto brush = GetBrush();
+                if (brush != nullptr)
+                    (render_target->*fill_function)(Convert(GetShape()), brush.Get());
+            }
+        };
+
+        extern template ShapeFillRenderObject<Rect, D2D1_RECT_F, &ID2D1RenderTarget::FillRectangle>;
+        extern template ShapeFillRenderObject<RoundedRect, D2D1_ROUNDED_RECT, &ID2D1RenderTarget::FillRoundedRectangle>;
+        extern template ShapeFillRenderObject<Ellipse, D2D1_ELLIPSE, &ID2D1RenderTarget::FillEllipse>;
+    }
+
+    using RectangleFillRenderObject = details::ShapeFillRenderObject<Rect, D2D1_RECT_F, &ID2D1RenderTarget::FillRectangle>;
+    using RoundedRectangleFillRenderObject = details::ShapeFillRenderObject<RoundedRect, D2D1_ROUNDED_RECT, &ID2D1RenderTarget::FillRoundedRectangle>;
+    using EllipseFillRenderObject = details::ShapeFillRenderObject<Ellipse, D2D1_ELLIPSE, &ID2D1RenderTarget::FillEllipse>;
+
+
+    class CustomDrawHandlerRenderObject : public RenderObject
+    {
+    public:
+        using DrawHandler = std::function<void(ID2D1RenderTarget*)>;
+
+        CustomDrawHandlerRenderObject() = default;
+        CustomDrawHandlerRenderObject(const CustomDrawHandlerRenderObject& other) = delete;
+        CustomDrawHandlerRenderObject& operator=(const CustomDrawHandlerRenderObject& other) = delete;
+        CustomDrawHandlerRenderObject(CustomDrawHandlerRenderObject&& other) = delete;
+        CustomDrawHandlerRenderObject& operator=(CustomDrawHandlerRenderObject&& other) = delete;
+        ~CustomDrawHandlerRenderObject() override = default;
+
+        DrawHandler GetDrawHandler() const
+        {
+            return draw_handler_;
+        }
+
+        void SetDrawHandler(DrawHandler new_draw_handler);
+
+    protected:
+        void Draw(ID2D1RenderTarget* render_target) override;
+
+    private:
+        DrawHandler draw_handler_{};
+    };
+}