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diff --git a/Userland/DevTools/HackStudio/Tool.h b/Userland/DevTools/HackStudio/Tool.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/Noncopyable.h>
+#include <LibGUI/Forward.h>
+
+namespace HackStudio {
+
+class FormEditorWidget;
+
+class Tool {
+    AK_MAKE_NONCOPYABLE(Tool);
+    AK_MAKE_NONMOVABLE(Tool);
+
+public:
+    virtual ~Tool() { }
+
+    virtual void on_mousedown(GUI::MouseEvent&) = 0;
+    virtual void on_mouseup(GUI::MouseEvent&) = 0;
+    virtual void on_mousemove(GUI::MouseEvent&) = 0;
+    virtual void on_keydown(GUI::KeyEvent&) = 0;
+    virtual void on_second_paint(GUI::Painter&, GUI::PaintEvent&) { }
+
+    virtual const char* class_name() const = 0;
+
+    virtual void attach() { }
+    virtual void detach() { }
+
+protected:
+    explicit Tool(FormEditorWidget& editor)
+        : m_editor(editor)
+    {
+    }
+
+    FormEditorWidget& m_editor;
+};
+
+}