1 files changed, 75 insertions, 0 deletions
diff --git a/include/cru/ui/style/Trigger.hpp b/include/cru/ui/style/Trigger.hpp
new file mode 100644
index 00000000..ab012a3e
--- /dev/null
+++ b/include/cru/ui/style/Trigger.hpp
@@ -0,0 +1,75 @@
+#pragma once
+#include "../Base.hpp"
+#include "cru/common/Base.hpp"
+#include "cru/common/Event.hpp"
+#include "cru/ui/controls/IClickableControl.hpp"
+#include "cru/ui/helper/ClickDetector.hpp"
+
+#include <utility>
+#include <vector>
+
+namespace cru::ui::style {
+class Trigger {
+ public:
+  virtual ~Trigger() = default;
+
+  bool GetState() const { return current_; }
+  IEvent<bool>* ChangeEvent() { return &change_event_; }
+
+ protected:
+  void Raise(bool value);
+
+ private:
+  bool current_ = false;
+  Event<bool> change_event_;
+
+ protected:
+  EventRevokerListGuard guard_;
+};
+
+class CompoundTrigger : public Trigger {
+ public:
+  explicit CompoundTrigger(std::vector<Trigger*> triggers);
+
+  const std::vector<Trigger*>& GetTriggers() const { return triggers_; }
+
+ protected:
+  virtual bool CalculateState(const std::vector<Trigger*>& triggers) const = 0;
+
+ private:
+  std::vector<Trigger*> triggers_;
+};
+
+class AndTrigger : public CompoundTrigger {
+ public:
+  using CompoundTrigger::CompoundTrigger;
+
+ protected:
+  bool CalculateState(const std::vector<Trigger*>& triggers) const override;
+};
+
+class OrTrigger : public CompoundTrigger {
+ public:
+  using CompoundTrigger::CompoundTrigger;
+
+ protected:
+  bool CalculateState(const std::vector<Trigger*>& triggers) const override;
+};
+
+class FocusTrigger : public Trigger {
+ public:
+  FocusTrigger(controls::Control* control, bool has_focus);
+
+ private:
+  bool has_focus_;
+};
+
+class ClickStateTrigger : public Trigger {
+ public:
+  ClickStateTrigger(controls::IClickableControl* control,
+                    helper::ClickState click_state);
+
+ private:
+  helper::ClickState click_state_;
+};
+}  // namespace cru::ui::style