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1 files changed, 57 insertions, 0 deletions

diff --git a/include/cru/ui/render/StackLayoutRenderObject.h b/include/cru/ui/render/StackLayoutRenderObject.h
new file mode 100644
index 00000000..e141d16e
--- /dev/null
+++ b/include/cru/ui/render/StackLayoutRenderObject.h
@@ -0,0 +1,57 @@
+#pragma once
+#include "LayoutRenderObject.h"
+#include "cru/ui/Base.h"
+
+namespace cru::ui::render {
+// Measure Logic:
+// Following rules are applied both horizontally and vertically.
+//
+// 1. Measure each children with min size not specified and max size as
+// following rules:
+//
+//    1.1. If parent's preferred size is set and it is not less than child's min
+//    size, then it is used as child's max size.
+//
+//    1.2. Or if parent's max size is set, then it is used as child's max size.
+//    If it is less than child's min size, then log an warning about that.
+//
+// 2. Result size is children's max size.
+//
+// 3. If preferred size is specified and result size is smaller than it, coerce
+// result size to preferred size.
+//
+// 4. If result size is smaller than min size (if specified), coerce result size
+// to min size.
+class CRU_UI_API StackLayoutRenderObject
+    : public LayoutRenderObject<StackChildLayoutData> {
+  CRU_DEFINE_CLASS_LOG_TAG(u"cru::ui::render:StackLayoutRenderObject")
+
+ public:
+  StackLayoutRenderObject() = default;
+  CRU_DELETE_COPY(StackLayoutRenderObject)
+  CRU_DELETE_MOVE(StackLayoutRenderObject)
+  ~StackLayoutRenderObject() = default;
+
+  std::u16string_view GetName() const override {
+    return u"StackLayoutRenderObject";
+  }
+
+  Alignment GetDefaultHorizontalAlignment() const {
+    return default_vertical_alignment_;
+  }
+  void SetDefaultHorizontalAlignment(Alignment alignment);
+  Alignment GetDefaultVerticalAlignment() {
+    return default_horizontal_alignment_;
+  }
+  void SetDefaultVertialAlignment(Alignment alignment);
+
+ protected:
+  Size OnMeasureContent(const MeasureRequirement& requirement,
+                        const MeasureSize& preferred_size) override;
+  void OnLayoutContent(const Rect& content_rect) override;
+
+ private:
+  Alignment default_horizontal_alignment_ = Alignment::Start;
+  Alignment default_vertical_alignment_ = Alignment::Start;
+};
+}  // namespace cru::ui::render