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diff --git a/Userland/Libraries/LibGUI/Dialog.h b/Userland/Libraries/LibGUI/Dialog.h
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+++ b/Userland/Libraries/LibGUI/Dialog.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/Window.h>
+
+namespace GUI {
+
+class Dialog : public Window {
+    C_OBJECT(Dialog)
+public:
+    enum ExecResult {
+        ExecOK = 0,
+        ExecCancel = 1,
+        ExecAborted = 2,
+        ExecYes = 3,
+        ExecNo = 4,
+    };
+
+    virtual ~Dialog() override;
+
+    int exec();
+
+    int result() const { return m_result; }
+    void done(int result);
+
+    virtual void event(Core::Event&) override;
+
+    virtual void close() override;
+
+protected:
+    explicit Dialog(Window* parent_window);
+
+private:
+    OwnPtr<Core::EventLoop> m_event_loop;
+    int m_result { ExecAborted };
+};
+
+}
+
+template<>
+struct AK::Formatter<GUI::Dialog> : Formatter<Core::Object> {
+};