Add canvas render object.

3 files changed, 28 insertions, 8 deletions

diff --git a/src/ui/render/canvas_render_object.cpp b/src/ui/render/canvas_render_object.cpp
new file mode 100644
index 00000000..7a2a1af0
--- /dev/null
+++ b/src/ui/render/canvas_render_object.cpp
@@ -0,0 +1,18 @@
+#include "cru/ui/render/canvas_render_object.hpp"
+
+namespace cru::ui::render {
+CanvasRenderObject::CanvasRenderObject() : RenderObject(ChildMode::None) {}
+
+CanvasRenderObject::~CanvasRenderObject() = default;
+
+void CanvasRenderObject::Draw(platform::graph::IPainter* painter) {
+  const auto rect = GetContentRect();
+  CanvasPaintEventArgs args{painter, rect};
+  paint_event_.Raise(args);
+}
+
+RenderObject* CanvasRenderObject::HitTest(const Point& point) {
+  const auto padding_rect = GetPaddingRect();
+  return padding_rect.IsPointInside(point) ? this : nullptr;
+}
+}  // namespace cru::ui::render
diff --git a/src/ui/render/render_object.cpp b/src/ui/render/render_object.cpp
index d220b1c1..54c2d1b4 100644
--- a/src/ui/render/render_object.cpp
+++ b/src/ui/render/render_object.cpp
@@ -121,6 +121,14 @@ void RenderObject::OnLayoutCore(const Rect& rect) {
 
 void RenderObject::OnAfterLayout() {}
 
+Rect RenderObject::GetPaddingRect() const {
+  Rect rect{Point{}, GetSize()};
+  rect = rect.Shrink(GetMargin());
+  rect.width = std::max(rect.width, 0.0f);
+  rect.height = std::max(rect.height, 0.0f);
+  return rect;
+}
+
 Rect RenderObject::GetContentRect() const {
   Rect rect{Point{}, GetSize()};
   rect = rect.Shrink(GetMargin());
diff --git a/src/ui/render/text_render_object.cpp b/src/ui/render/text_render_object.cpp
index 5022cc04..6048f731 100644
--- a/src/ui/render/text_render_object.cpp
+++ b/src/ui/render/text_render_object.cpp
@@ -64,14 +64,8 @@ void TextRenderObject::Draw(platform::graph::IPainter* painter) {
 }
 
 RenderObject* TextRenderObject::HitTest(const Point& point) {
-  const auto margin = GetMargin();
-  const auto size = GetSize();
-  return Rect{margin.left, margin.top,
-              std::max(size.width - margin.GetHorizontalTotal(), 0.0f),
-              std::max(size.height - margin.GetVerticalTotal(), 0.0f)}
-                 .IsPointInside(point)
-             ? this
-             : nullptr;
+  const auto padding_rect = GetPaddingRect();
+  return padding_rect.IsPointInside(point) ? this : nullptr;
 }
 
 Size TextRenderObject::OnMeasureContent(const Size& available_size) {