1 files changed, 60 insertions, 0 deletions
diff --git a/src/animator.hh b/src/animator.hh
new file mode 100644
index 0000000..c8072ac
--- /dev/null
+++ b/src/animator.hh
@@ -0,0 +1,60 @@
+#ifndef ANIMATOR_HH
+#define ANIMATOR_HH
+
+#include <memory>
+
+class Animation;
+class Looper;
+
+class Animator {
+public:
+  class Observer {
+  public:
+    virtual ~Observer() {}
+
+    // Called after all active animations callbacks has been called.
+    // Not called if there are no active animations.
+    virtual void tick(Animator* animator) = 0;
+
+  protected:
+    Observer() {}
+  };
+
+  class AnimationObserver {
+  public:
+    virtual ~AnimationObserver() {}
+
+    // Called after the animation has been updated with the new value
+    virtual void ticked(Animator* animator, Animation* animation,
+                        double value) = 0;
+    // Called after the animation stopped, either because stop() was called
+    // or because animation->tick() return false.
+    // If animation->tick() returned false ticked method above is always called
+    // first
+    virtual void stopped(Animator* animator, Animation* animation) = 0;
+
+  protected:
+    AnimationObserver() {}
+  };
+
+  virtual ~Animator() {}
+
+  static Animator* create(std::shared_ptr<Looper> const& looper);
+
+  virtual void start(std::shared_ptr<Animation> const& animation,
+                     AnimationObserver* observer) = 0;
+  virtual bool observe(Animation* animation, AnimationObserver* observer) = 0;
+  virtual bool stop(Animation* animation) = 0;
+  virtual bool active(Animation* animation) const = 0;
+  virtual bool active() const = 0;
+
+  virtual void add_observer(Observer* observer) = 0;
+  virtual void remove_observer(Observer* observer) = 0;
+
+protected:
+  Animator() {}
+  Animator(Animator const&) = delete;
+  Animator& operator=(Animator const&) = delete;
+};
+
+#endif  // ANIMATOR_HH