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diff --git a/Userland/Libraries/LibGUI/TreeView.h b/Userland/Libraries/LibGUI/TreeView.h
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+++ b/Userland/Libraries/LibGUI/TreeView.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 <AK/HashMap.h>
+#include <LibGUI/AbstractTableView.h>
+
+namespace GUI {
+
+class TreeView : public AbstractTableView {
+    C_OBJECT(TreeView)
+public:
+    virtual ~TreeView() override;
+
+    virtual void scroll_into_view(const ModelIndex&, bool scroll_horizontally, bool scroll_vertically) override;
+
+    virtual int item_count() const override;
+    virtual void toggle_index(const ModelIndex&) override;
+
+    void expand_tree(const ModelIndex& root = {});
+    void collapse_tree(const ModelIndex& root = {});
+
+    void expand_all_parents_of(const ModelIndex&);
+
+    Function<void(const ModelIndex&, const bool)> on_toggle;
+
+    void set_should_fill_selected_rows(bool fill) { m_should_fill_selected_rows = fill; }
+    bool should_fill_selected_rows() const { return m_should_fill_selected_rows; }
+
+protected:
+    TreeView();
+
+    virtual void paint_event(PaintEvent&) override;
+    virtual void doubleclick_event(MouseEvent&) override;
+    virtual void keydown_event(KeyEvent&) override;
+
+    virtual void did_update_selection() override;
+    virtual void model_did_update(unsigned flags) override;
+    virtual void move_cursor(CursorMovement, SelectionUpdate) override;
+
+private:
+    virtual ModelIndex index_at_event_position(const Gfx::IntPoint&, bool& is_toggle) const override;
+
+    int row_height() const { return 16; }
+    int max_item_width() const { return frame_inner_rect().width(); }
+    int indent_width_in_pixels() const { return 16; }
+    int icon_size() const { return 16; }
+    int icon_spacing() const { return 2; }
+    int toggle_size() const { return 9; }
+    int text_padding() const { return 2; }
+    int tree_column_x_offset() const;
+    virtual void update_column_sizes() override;
+
+    template<typename Callback>
+    void traverse_in_paint_order(Callback) const;
+
+    struct MetadataForIndex;
+
+    MetadataForIndex& ensure_metadata_for_index(const ModelIndex&) const;
+    void set_open_state_of_all_in_subtree(const ModelIndex& root, bool open);
+
+    mutable HashMap<void*, NonnullOwnPtr<MetadataForIndex>> m_view_metadata;
+
+    RefPtr<Gfx::Bitmap> m_expand_bitmap;
+    RefPtr<Gfx::Bitmap> m_collapse_bitmap;
+
+    bool m_should_fill_selected_rows { false };
+};
+
+}