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diff --git a/Libraries/LibGUI/AutocompleteProvider.h b/Libraries/LibGUI/AutocompleteProvider.h
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+++ b/Libraries/LibGUI/AutocompleteProvider.h
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+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * 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/Forward.h>
+#include <LibGUI/TextEditor.h>
+#include <LibGUI/Window.h>
+
+namespace GUI {
+
+class AutocompleteProvider {
+    AK_MAKE_NONCOPYABLE(AutocompleteProvider);
+    AK_MAKE_NONMOVABLE(AutocompleteProvider);
+
+public:
+    virtual ~AutocompleteProvider() { }
+
+    enum class CompletionKind {
+        Identifier,
+    };
+
+    enum class Language {
+        Unspecified,
+        Cpp,
+    };
+
+    struct Entry {
+        String completion;
+        size_t partial_input_length { 0 };
+        CompletionKind kind { CompletionKind::Identifier };
+        Language language { Language::Unspecified };
+    };
+
+    virtual void provide_completions(Function<void(Vector<Entry>)>) = 0;
+
+    void attach(TextEditor& editor)
+    {
+        ASSERT(!m_editor);
+        m_editor = editor;
+    }
+    void detach() { m_editor.clear(); }
+
+protected:
+    AutocompleteProvider() { }
+
+    WeakPtr<TextEditor> m_editor;
+};
+
+class AutocompleteBox final {
+public:
+    explicit AutocompleteBox(TextEditor&);
+    ~AutocompleteBox();
+
+    void update_suggestions(Vector<AutocompleteProvider::Entry>&& suggestions);
+    bool is_visible() const;
+    void show(Gfx::IntPoint suggstion_box_location);
+    void close();
+
+    void next_suggestion();
+    void previous_suggestion();
+    void apply_suggestion();
+
+private:
+    WeakPtr<TextEditor> m_editor;
+    RefPtr<GUI::Window> m_popup_window;
+    RefPtr<GUI::TableView> m_suggestion_view;
+};
+
+}