From 565057cf77c6161eab259fd52eab5371e9deeccb Mon Sep 17 00:00:00 2001
From: David Capello <david@igarastudio.com>
Date: Wed, 7 Apr 2021 18:51:48 -0300
Subject: [PATCH] Add missing file in 67eeac8045eb126c4cc0d956a83a3f58de134e49

---
 src/app/ui/timeline/timeline_observer.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 src/app/ui/timeline/timeline_observer.h

diff --git a/src/app/ui/timeline/timeline_observer.h b/src/app/ui/timeline/timeline_observer.h
new file mode 100644
index 000000000..df011a2c1
--- /dev/null
+++ b/src/app/ui/timeline/timeline_observer.h
@@ -0,0 +1,24 @@
+// Aseprite
+// Copyright (C) 2021  Igara Studio S.A.
+//
+// This program is distributed under the terms of
+// the End-User License Agreement for Aseprite.
+
+#ifndef APP_UI_TIMELINE_TIMELINE_OBSERVER_H_INCLUDED
+#define APP_UI_TIMELINE_TIMELINE_OBSERVER_H_INCLUDED
+#pragma once
+
+namespace app {
+  class Timeline;
+
+  class TimelineObserver {
+  public:
+    virtual ~TimelineObserver() { }
+
+    // Called when the current timeline range is going to change.
+    virtual void onBeforeRangeChanged(Timeline* timeline) { }
+  };
+
+} // namespace app
+
+#endif