Experimental alignment layout manager using a property on the views

ui/views/layout/align_layout.h

+// Copyright (c) 2011 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 UI_VIEWS_LAYOUT_ALIGN_LAYOUT_H_
+#define UI_VIEWS_LAYOUT_ALIGN_LAYOUT_H_
+
+#include <stddef.h>
+
+#include <algorithm>
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/views/fill_attribute.h"
+#include "ui/views/layout/layout_manager.h"
+#include "ui/views/view.h"
+
+namespace views {
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// AlignLayout
+//  A LayoutManager that causes the associated view's children to be aligned
+//  and/or anchored within the bounds of their parent based on the value of the
+//  views' align or anchor attributes.
+//
+///////////////////////////////////////////////////////////////////////////////
+class VIEWS_EXPORT AlignLayout : public LayoutManager {
+ public:
+  AlignLayout();
+  ~AlignLayout() override;
+
+  // Overridden from LayoutManager:
+  void Layout(View* host) override;
+  gfx::Size GetPreferredSize(const View* host) const override;
+  int GetPreferredHeightForWidth(const View* host, int width) const override;
+
+ private:
+  void AlignViews(View* host, views::Fill fill, gfx::Rect& contents);
+  void PlaceView(View* view, views::Fill fill, gfx::Rect& contents);
+  bool ShouldAlign(View* host);
+  bool ShouldInsert(View* child1, View* child2, views::Fill fill);
+  DISALLOW_COPY_AND_ASSIGN(AlignLayout);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_LAYOUT_FILL_LAYOUT_H_