2 files changed, 68 insertions, 0 deletions
diff --git a/src/ui/style/Condition.cpp b/src/ui/style/Condition.cpp
index 891eb062..f4866c04 100644
--- a/src/ui/style/Condition.cpp
+++ b/src/ui/style/Condition.cpp
@@ -51,6 +51,16 @@ bool FocusCondition::Judge(controls::Control* control) const {
   return control->HasFocus() == has_focus_;
 }
 
+std::vector<IBaseEvent*> HoverCondition::ChangeOn(
+    controls::Control* control) const {
+  return {control->MouseEnterEvent()->Direct(),
+          control->MouseLeaveEvent()->Direct()};
+}
+
+bool HoverCondition::Judge(controls::Control* control) const {
+  return control->IsMouseOver() == hover_;
+}
+
 ClickStateCondition::ClickStateCondition(helper::ClickState click_state)
     : click_state_(click_state) {}
 
diff --git a/src/ui/style/StyleRuleSet.cpp b/src/ui/style/StyleRuleSet.cpp
index e69de29b..403fe114 100644
--- a/src/ui/style/StyleRuleSet.cpp
+++ b/src/ui/style/StyleRuleSet.cpp
@@ -0,0 +1,58 @@
+#include "cru/ui/style/StyleRuleSet.hpp"
+#include "cru/common/Event.hpp"
+#include "gsl/gsl_assert"
+
+#include <unordered_set>
+
+namespace cru::ui::style {
+void StyleRuleSet::AddStyleRule(StyleRule rule, gsl::index index) {
+  Expects(index >= 0 && index <= GetSize());
+
+  rules_.insert(rules_.cbegin() + index, std::move(rule));
+
+  UpdateChangeListener();
+  UpdateStyle();
+}
+
+void StyleRuleSet::RemoveStyleRule(gsl::index index, gsl::index count) {
+  Expects(index >= 0);
+  Expects(count >= 0 && index + count <= GetSize());
+
+  rules_.erase(rules_.cbegin() + index, rules_.cbegin() + index + count);
+
+  UpdateChangeListener();
+  UpdateStyle();
+}
+
+void StyleRuleSet::Set(const StyleRuleSet& other) {
+  rules_ = other.rules_;
+  UpdateChangeListener();
+  UpdateStyle();
+}
+
+void StyleRuleSet::UpdateChangeListener() {
+  if (control_ == nullptr) return;
+
+  guard_.Clear();
+
+  std::unordered_set<IBaseEvent*> events;
+  for (const auto& rule : rules_) {
+    auto e = rule.GetCondition()->ChangeOn(control_);
+    events.insert(e.cbegin(), e.cend());
+  }
+
+  for (auto e : events) {
+    guard_ += e->AddSpyOnlyHandler([this] { this->UpdateStyle(); });
+  }
+}
+
+void StyleRuleSet::UpdateStyle() {
+  if (control_ == nullptr) return;
+
+  for (const auto& rule : rules_) {
+    if (rule.GetCondition()->Judge(control_)) {
+      rule.GetStyler()->Apply(control_);
+    }
+  }
+}
+}  // namespace cru::ui::style