Write canvas render object layout logic.

3 files changed, 23 insertions, 2 deletions

diff --git a/src/ui/CMakeLists.txt b/src/ui/CMakeLists.txt
index cb34e590..2220740e 100644
--- a/src/ui/CMakeLists.txt
+++ b/src/ui/CMakeLists.txt
@@ -21,6 +21,7 @@ add_library(cru_ui STATIC
     render/border_render_object.cpp
     render/canvas_render_object.cpp
     render/flex_layout_render_object.cpp
+    render/layout_utility.cpp
     render/render_object.cpp
     render/stack_layout_render_object.cpp
     render/text_render_object.cpp
@@ -46,6 +47,7 @@ target_sources(cru_ui PUBLIC
 	${CRU_UI_INCLUDE_DIR}/render/canvas_render_object.hpp
 	${CRU_UI_INCLUDE_DIR}/render/flex_layout_render_object.hpp
 	${CRU_UI_INCLUDE_DIR}/render/layout_render_object.hpp
+	${CRU_UI_INCLUDE_DIR}/render/layout_utility.hpp
 	${CRU_UI_INCLUDE_DIR}/render/render_object.hpp
     ${CRU_UI_INCLUDE_DIR}/render/stack_layout_render_object.hpp
 	${CRU_UI_INCLUDE_DIR}/render/text_render_object.hpp
diff --git a/src/ui/render/canvas_render_object.cpp b/src/ui/render/canvas_render_object.cpp
index 0a442317..0508e276 100644
--- a/src/ui/render/canvas_render_object.cpp
+++ b/src/ui/render/canvas_render_object.cpp
@@ -1,5 +1,7 @@
 #include "cru/ui/render/canvas_render_object.hpp"
 
+#include "cru/ui/render/layout_utility.hpp"
+
 namespace cru::ui::render {
 CanvasRenderObject::CanvasRenderObject() : RenderObject(ChildMode::None) {}
 
@@ -17,8 +19,10 @@ RenderObject* CanvasRenderObject::HitTest(const Point& point) {
 }
 
 Size CanvasRenderObject::OnMeasureContent(const Size& available_size) {
-  return Size{};
+  return Min(available_size, GetDesiredSize());
 }
 
-void CanvasRenderObject::OnLayoutContent(const Rect& content_rect) {}
+void CanvasRenderObject::OnLayoutContent(const Rect& content_rect) {
+  CRU_UNUSED(content_rect)
+}
 }  // namespace cru::ui::render
diff --git a/src/ui/render/layout_utility.cpp b/src/ui/render/layout_utility.cpp
new file mode 100644
index 00000000..aae62d35
--- /dev/null
+++ b/src/ui/render/layout_utility.cpp
@@ -0,0 +1,15 @@
+#include "cru/ui/render/layout_utility.hpp"
+
+#include <algorithm>
+
+namespace cru::ui::render {
+Size Min(const Size& left, const Size& right) {
+  return Size{std::min(left.width, right.width),
+              std::min(left.height, right.height)};
+}
+
+Size Max(const Size& left, const Size& right) {
+  return Size{std::max(left.width, right.width),
+              std::max(left.height, right.height)};
+}
+}  // namespace cru::ui::render