Add canvas render object.

2 files changed, 44 insertions, 0 deletions

diff --git a/include/cru/ui/render/canvas_render_object.hpp b/include/cru/ui/render/canvas_render_object.hpp
new file mode 100644
index 00000000..fea68576
--- /dev/null
+++ b/include/cru/ui/render/canvas_render_object.hpp
@@ -0,0 +1,43 @@
+#pragma once
+#include "render_object.hpp"
+
+#include "cru/common/event.hpp"
+
+namespace cru::ui::render {
+class CanvasPaintEventArgs {
+ public:
+  CanvasPaintEventArgs(platform::graph::IPainter* painter,
+                       const Rect& paint_rect)
+      : painter_(painter), paint_rect_(paint_rect) {}
+  CRU_DEFAULT_COPY(CanvasPaintEventArgs)
+  CRU_DEFAULT_MOVE(CanvasPaintEventArgs)
+  ~CanvasPaintEventArgs() = default;
+
+  platform::graph::IPainter* GetPainter() const { return painter_; }
+  Rect GetPaintRect() const { return paint_rect_; }
+
+ private:
+  platform::graph::IPainter* painter_;
+  Rect paint_rect_;
+};
+
+class CanvasRenderObject : public RenderObject {
+ public:
+  CanvasRenderObject();
+
+  CRU_DELETE_COPY(CanvasRenderObject)
+  CRU_DELETE_MOVE(CanvasRenderObject)
+
+  ~CanvasRenderObject();
+
+ public:
+  void Draw(platform::graph::IPainter* painter) override;
+
+  RenderObject* HitTest(const Point& point) override;
+
+  IEvent<CanvasPaintEventArgs>* PaintEvent() { return &paint_event_; }
+
+ private:
+  Event<CanvasPaintEventArgs> paint_event_;
+};
+}  // namespace cru::ui::render
diff --git a/include/cru/ui/render/render_object.hpp b/include/cru/ui/render/render_object.hpp
index 73543aa3..b0a65819 100644
--- a/include/cru/ui/render/render_object.hpp
+++ b/include/cru/ui/render/render_object.hpp
@@ -116,6 +116,7 @@ class RenderObject : public Object {
   virtual void OnAfterLayout();
   static void NotifyAfterLayoutRecursive(RenderObject* render_object);
 
+  Rect GetPaddingRect() const;
   Rect GetContentRect() const;
 
  private: