views: Move BoxLayout class into views/examples directory.

views/examples/box_layout.h

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef VIEWS_EXAMPLES_BOX_LAYOUT_H_
+#define VIEWS_EXAMPLES_BOX_LAYOUT_H_
+
+#include "views/layout_manager.h"
+
+namespace examples {
+
+// A layout manager that layouts child views vertically or horizontally.
+class BoxLayout : public views::LayoutManager {
+ public:
+  enum Orientation {
+    kHorizontal,
+    kVertical,
+  };
+
+  BoxLayout(Orientation orientation, int margin);
+
+  virtual ~BoxLayout() {}
+
+  // Overridden from views::LayoutManager:
+  virtual void Layout(views::View* host);
+
+  virtual gfx::Size GetPreferredSize(views::View* host);
+
+ private:
+  const Orientation orientation_;
+
+  // The pixel distance between children.
+  const int margin_;
+
+  DISALLOW_COPY_AND_ASSIGN(BoxLayout);
+};
+
+}  // namespace examples
+
+#endif  // VIEWS_EXAMPLES_BOX_LAYOUT_H_