1 files changed, 131 insertions, 0 deletions
diff --git a/src/ui/animations/animation.hpp b/src/ui/animations/animation.hpp
new file mode 100644
index 00000000..99389f33
--- /dev/null
+++ b/src/ui/animations/animation.hpp
@@ -0,0 +1,131 @@
+#pragma once
+
+#include <unordered_map>
+
+#include "base.hpp"
+#include "application.hpp"
+#include "timer.hpp"
+
+namespace cru::ui::animations
+{
+    using AnimationTimeUnit = FloatSecond;
+
+    struct IAnimationDelegate : virtual Interface
+    {
+        virtual void Cancel() = 0;
+    };
+
+    using AnimationDelegatePtr = std::shared_ptr<IAnimationDelegate>;
+
+    using AnimationStepHandler = std::function<void(AnimationDelegatePtr, double)>;
+    using AnimationStartHandler = std::function<void(AnimationDelegatePtr)>;
+    using AnimationFinishHandler = std::function<void()>;
+    using AnimationCancelHandler = std::function<void()>;
+
+    namespace details
+    {
+        class Animation;
+        using AnimationPtr = std::unique_ptr<Animation>;
+
+        class AnimationInfo
+        {
+        public:
+            AnimationInfo(String tag, const AnimationTimeUnit duration)
+                : tag(std::move(tag)),
+                  duration(duration)
+            {
+
+            }
+            AnimationInfo(const AnimationInfo& other) = default;
+            AnimationInfo(AnimationInfo&& other) = default;
+            AnimationInfo& operator=(const AnimationInfo& other) = default;
+            AnimationInfo& operator=(AnimationInfo&& other) = default;
+            ~AnimationInfo() = default;
+
+            String tag;
+            AnimationTimeUnit duration;
+            std::vector<AnimationStepHandler> step_handlers{};
+            std::vector<AnimationStartHandler> start_handlers{};
+            std::vector<AnimationFinishHandler> finish_handlers{};
+            std::vector<AnimationCancelHandler> cancel_handlers{};
+        };
+
+        class AnimationManager : public Object
+        {
+        public:
+            static AnimationManager* GetInstance()
+            {
+                return Application::GetInstance()->GetAnimationManager();
+            }
+
+        public:
+            AnimationManager();
+            AnimationManager(const AnimationManager& other) = delete;
+            AnimationManager(AnimationManager&& other) = delete;
+            AnimationManager& operator=(const AnimationManager& other) = delete;
+            AnimationManager& operator=(AnimationManager&& other) = delete;
+            ~AnimationManager() override;
+
+            AnimationDelegatePtr CreateAnimation(AnimationInfo info);
+            void RemoveAnimation(const String& tag);
+
+        private:
+            void SetTimer();
+            void KillTimer();
+
+        private:
+            std::unordered_map<String, AnimationPtr> animations_;
+            std::optional<TimerTask> timer_;
+        };
+    }
+
+    class AnimationBuilder : public Object
+    {
+    public:
+        AnimationBuilder(String tag, const AnimationTimeUnit duration)
+            : info_(std::move(tag), duration)
+        {
+
+        }
+
+        AnimationBuilder& AddStepHandler(const AnimationStepHandler& handler)
+        {
+            CheckValid();
+            info_.step_handlers.push_back(handler);
+            return *this;
+        }
+
+        AnimationBuilder& AddStartHandler(const AnimationStartHandler& handler)
+        {
+            CheckValid();
+            info_.start_handlers.push_back(handler);
+            return *this;
+        }
+
+        AnimationBuilder& AddFinishHandler(const AnimationFinishHandler& handler)
+        {
+            CheckValid();
+            info_.finish_handlers.push_back(handler);
+            return *this;
+        }
+
+        AnimationBuilder& AddCancelHandler(const AnimationCancelHandler& handler)
+        {
+            CheckValid();
+            info_.cancel_handlers.push_back(handler);
+            return *this;
+        }
+
+        AnimationDelegatePtr Start();
+
+    private:
+        void CheckValid() const
+        {
+            if (!valid_)
+                throw std::runtime_error("The animation builder is invalid.");
+        }
+
+        bool valid_ = true;
+        details::AnimationInfo info_;
+    };
+}