3 files changed, 93 insertions, 3 deletions
diff --git a/include/cru/ui/style/Condition.hpp b/include/cru/ui/style/Condition.hpp
index 97d29287..c4fd2106 100644
--- a/include/cru/ui/style/Condition.hpp
+++ b/include/cru/ui/style/Condition.hpp
@@ -5,6 +5,7 @@
 #include "cru/ui/controls/IClickableControl.hpp"
 #include "cru/ui/helper/ClickDetector.hpp"
 
+#include <memory>
 #include <type_traits>
 #include <utility>
 #include <vector>
@@ -15,18 +16,26 @@ class Condition : public Object {
   virtual std::vector<IBaseEvent*> ChangeOn(
       controls::Control* control) const = 0;
   virtual bool Judge(controls::Control* control) const = 0;
+
+  virtual std::unique_ptr<Condition> Clone() const = 0;
 };
 
 class CompoundCondition : public Condition {
  public:
-  explicit CompoundCondition(std::vector<Condition*> conditions);
+  explicit CompoundCondition(
+      std::vector<std::unique_ptr<Condition>> conditions);
+
+  const std::vector<Condition*>& GetConditions() const {
+    return readonly_conditions_;
+  }
 
-  const std::vector<Condition*>& GetConditions() const { return conditions_; }
+  std::vector<std::unique_ptr<Condition>> CloneConditions() const;
 
   std::vector<IBaseEvent*> ChangeOn(controls::Control* control) const override;
 
  private:
-  std::vector<Condition*> conditions_;
+  std::vector<std::unique_ptr<Condition>> conditions_;
+  std::vector<Condition*> readonly_conditions_;
 };
 
 class AndCondition : public CompoundCondition {
@@ -34,6 +43,10 @@ class AndCondition : public CompoundCondition {
   using CompoundCondition::CompoundCondition;
 
   bool Judge(controls::Control* control) const override;
+
+  std::unique_ptr<Condition> Clone() const override {
+    return std::make_unique<AndCondition>(CloneConditions());
+  }
 };
 
 class OrCondition : public CompoundCondition {
@@ -41,6 +54,10 @@ class OrCondition : public CompoundCondition {
   using CompoundCondition::CompoundCondition;
 
   bool Judge(controls::Control* control) const override;
+
+  std::unique_ptr<Condition> Clone() const override {
+    return std::make_unique<OrCondition>(CloneConditions());
+  }
 };
 
 class FocusCondition : public Condition {
@@ -50,6 +67,10 @@ class FocusCondition : public Condition {
   std::vector<IBaseEvent*> ChangeOn(controls::Control* control) const override;
   bool Judge(controls::Control* control) const override;
 
+  std::unique_ptr<Condition> Clone() const override {
+    return std::make_unique<FocusCondition>(has_focus_);
+  }
+
  private:
   bool has_focus_;
 };
@@ -61,6 +82,10 @@ class ClickStateCondition : public Condition {
   std::vector<IBaseEvent*> ChangeOn(controls::Control* control) const override;
   bool Judge(controls::Control* control) const override;
 
+  std::unique_ptr<Condition> Clone() const override {
+    return std::make_unique<ClickStateCondition>(click_state_);
+  }
+
  private:
   helper::ClickState click_state_;
 };
diff --git a/include/cru/ui/style/StyleRule.hpp b/include/cru/ui/style/StyleRule.hpp
new file mode 100644
index 00000000..f1283e24
--- /dev/null
+++ b/include/cru/ui/style/StyleRule.hpp
@@ -0,0 +1,57 @@
+#pragma once
+#include "Condition.hpp"
+#include "Styler.hpp"
+#include "cru/common/Base.hpp"
+#include "cru/ui/Base.hpp"
+
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace cru::ui::style {
+class StyleRule : public Object {
+ public:
+  StyleRule(std::unique_ptr<Condition> condition,
+            std::unique_ptr<Styler> styler, std::u16string name = {});
+
+  StyleRule(const StyleRule& other)
+      : condition_(other.condition_->Clone()),
+        styler_(other.styler_->Clone()),
+        name_(other.name_) {}
+
+  StyleRule& operator=(const StyleRule& other) {
+    if (this != &other) {
+      condition_ = other.condition_->Clone();
+      styler_ = other.styler_->Clone();
+      name_ = other.name_;
+    }
+    return *this;
+  }
+
+  CRU_DEFAULT_MOVE(StyleRule)
+
+  ~StyleRule() override = default;
+
+ public:
+  const std::u16string& GetName() const { return name_; }
+  Condition* GetCondition() const { return condition_.get(); }
+  Styler* GetStyler() const { return styler_.get(); }
+
+  StyleRule WithNewCondition(std::unique_ptr<Condition> condition,
+                             std::u16string name = {}) const {
+    return StyleRule{std::move(condition), styler_->Clone(), std::move(name)};
+  }
+
+  StyleRule WithNewStyler(std::unique_ptr<Styler> styler,
+                          std::u16string name = {}) const {
+    return StyleRule{condition_->Clone(), std::move(styler), std::move(name)};
+  }
+
+  bool CheckAndApply(controls::Control* control) const;
+
+ private:
+  std::unique_ptr<Condition> condition_;
+  std::unique_ptr<Styler> styler_;
+  std::u16string name_;
+};
+}  // namespace cru::ui::style
diff --git a/include/cru/ui/style/Styler.hpp b/include/cru/ui/style/Styler.hpp
index 89731033..4f4b18ba 100644
--- a/include/cru/ui/style/Styler.hpp
+++ b/include/cru/ui/style/Styler.hpp
@@ -3,10 +3,14 @@
 #include "ApplyBorderStyleInfo.hpp"
 #include "cru/common/Base.hpp"
 
+#include <memory>
+
 namespace cru::ui::style {
 class Styler : public Object {
  public:
   virtual void Apply(controls::Control* control) const;
+
+  virtual std::unique_ptr<Styler> Clone() const = 0;
 };
 
 class BorderStyler : public Styler {
@@ -15,6 +19,10 @@ class BorderStyler : public Styler {
 
   void Apply(controls::Control* control) const override;
 
+  std::unique_ptr<Styler> Clone() const override {
+    return std::make_unique<BorderStyler>(style_);
+  }
+
  private:
   ApplyBorderStyleInfo style_;
 };