From 592f3f3f25f00232234399f4c5f51318a3fa49d2 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sat, 29 Jan 2022 22:09:29 +0800
Subject: ...

---
 include/cru/ui/Base.hpp                           |  6 ++++--
 include/cru/ui/controls/StackLayout.hpp           |  4 ++++
 include/cru/ui/render/StackLayoutRenderObject.hpp | 14 ++++++++++++++
 3 files changed, 22 insertions(+), 2 deletions(-)

(limited to 'include/cru/ui')

diff --git a/include/cru/ui/Base.hpp b/include/cru/ui/Base.hpp
index db360c07..e99c956f 100644
--- a/include/cru/ui/Base.hpp
+++ b/include/cru/ui/Base.hpp
@@ -62,12 +62,14 @@ namespace internal {
 constexpr int align_start = 0;
 constexpr int align_end = align_start + 1;
 constexpr int align_center = align_end + 1;
+constexpr int align_stretch = align_center + 1;
 }  // namespace internal
 
 enum class Alignment {
   Start = internal::align_start,
   End = internal::align_end,
   Center = internal::align_center,
+  Stretch = internal::align_stretch
 };
 
 struct CornerRadius {
@@ -144,7 +146,7 @@ struct FlexChildLayoutData {
 };
 
 struct StackChildLayoutData {
-  Alignment horizontal = Alignment::Start;
-  Alignment vertical = Alignment::Start;
+  std::optional<Alignment> horizontal;
+  std::optional<Alignment> vertical;
 };
 }  // namespace cru::ui
diff --git a/include/cru/ui/controls/StackLayout.hpp b/include/cru/ui/controls/StackLayout.hpp
index 657cadc6..5d90dfda 100644
--- a/include/cru/ui/controls/StackLayout.hpp
+++ b/include/cru/ui/controls/StackLayout.hpp
@@ -1,5 +1,6 @@
 #pragma once
 #include "LayoutControl.hpp"
+#include "cru/ui/Base.hpp"
 
 namespace cru::ui::controls {
 class CRU_UI_API StackLayout : public LayoutControl {
@@ -21,6 +22,9 @@ class CRU_UI_API StackLayout : public LayoutControl {
 
   render::RenderObject* GetRenderObject() const override;
 
+  const StackChildLayoutData& GetChildLayoutData(Index position);
+  void SetChildLayoutData(Index position, StackChildLayoutData data);
+
  private:
   std::shared_ptr<render::StackLayoutRenderObject> render_object_;
 };
diff --git a/include/cru/ui/render/StackLayoutRenderObject.hpp b/include/cru/ui/render/StackLayoutRenderObject.hpp
index b7b1502c..2f832e55 100644
--- a/include/cru/ui/render/StackLayoutRenderObject.hpp
+++ b/include/cru/ui/render/StackLayoutRenderObject.hpp
@@ -1,5 +1,6 @@
 #pragma once
 #include "LayoutRenderObject.hpp"
+#include "cru/ui/Base.hpp"
 
 namespace cru::ui::render {
 // Measure Logic:
@@ -35,9 +36,22 @@ class CRU_UI_API StackLayoutRenderObject
     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
-- 
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