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diff --git a/Libraries/LibGUI/Splitter.h b/Libraries/LibGUI/Splitter.h
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+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <LibGUI/Frame.h>
+
+namespace GUI {
+
+class Splitter : public Frame {
+    C_OBJECT(Splitter)
+public:
+    virtual ~Splitter() override;
+
+protected:
+    Splitter(Orientation, Widget* parent);
+
+    virtual void mousedown_event(MouseEvent&) override;
+    virtual void mousemove_event(MouseEvent&) override;
+    virtual void mouseup_event(MouseEvent&) override;
+    virtual void enter_event(Core::Event&) override;
+    virtual void leave_event(Core::Event&) override;
+
+private:
+    Orientation m_orientation;
+    bool m_resizing { false };
+    Gfx::Point m_resize_origin;
+    WeakPtr<Widget> m_first_resizee;
+    WeakPtr<Widget> m_second_resizee;
+    Gfx::Size m_first_resizee_start_size;
+    Gfx::Size m_second_resizee_start_size;
+};
+
+class VerticalSplitter final : public Splitter {
+    C_OBJECT(VerticalSplitter)
+public:
+    virtual ~VerticalSplitter() override {}
+
+private:
+    explicit VerticalSplitter(Widget* parent)
+        : Splitter(Orientation::Vertical, parent)
+    {
+    }
+};
+
+class HorizontalSplitter final : public Splitter {
+    C_OBJECT(HorizontalSplitter)
+public:
+    virtual ~HorizontalSplitter() override {}
+
+private:
+    explicit HorizontalSplitter(Widget* parent)
+        : Splitter(Orientation::Horizontal, parent)
+    {
+    }
+};
+
+}