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ui/views/layout/box_layout.h

Index: ui/views/layout/box_layout.h
diff --git a/ui/views/layout/box_layout.h b/ui/views/layout/box_layout.h
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--- a/ui/views/layout/box_layout.h
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-// Copyright (c) 2012 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_BOX_LAYOUT_H_
-#define UI_VIEWS_LAYOUT_BOX_LAYOUT_H_
-
-#include <map>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "ui/gfx/insets.h"
-#include "ui/views/layout/layout_manager.h"
-
-namespace gfx {
-class Rect;
-class Size;
-}
-
-namespace views {
-
-class View;
-
-// A Layout manager that arranges child views vertically or horizontally in a
-// side-by-side fashion with spacing around and between the child views. The
-// child views are always sized according to their preferred size. If the
-// host's bounds provide insufficient space, child views will be clamped.
-// Excess space will not be distributed.
-class VIEWS_EXPORT BoxLayout : public LayoutManager {
- public:
-  enum Orientation {
-    kHorizontal,
-    kVertical,
-  };
-
-  // This specifies where along the main axis the children should be laid out.
-  // e.g. a horizontal layout of MAIN_AXIS_ALIGNMENT_END will result in the
-  // child views being right-aligned.
-  enum MainAxisAlignment {
-    MAIN_AXIS_ALIGNMENT_START,
-    MAIN_AXIS_ALIGNMENT_CENTER,
-    MAIN_AXIS_ALIGNMENT_END,
-    // TODO(calamity): Add MAIN_AXIS_ALIGNMENT_JUSTIFY which spreads blank space
-    // in-between the child views.
-  };
-
-  // This specifies where along the cross axis the children should be laid out.
-  // e.g. a horizontal layout of CROSS_AXIS_ALIGNMENT_END will result in the
-  // child views being bottom-aligned.
-  enum CrossAxisAlignment {
-    // This causes the child view to stretch to fit the host in the cross axis.
-    CROSS_AXIS_ALIGNMENT_STRETCH,
-    CROSS_AXIS_ALIGNMENT_START,
-    CROSS_AXIS_ALIGNMENT_CENTER,
-    CROSS_AXIS_ALIGNMENT_END,
-  };
-
-  // Use |inside_border_horizontal_spacing| and
-  // |inside_border_vertical_spacing| to add additional space between the child
-  // view area and the host view border. |between_child_spacing| controls the
-  // space in between child views.
-  BoxLayout(Orientation orientation,
-            int inside_border_horizontal_spacing,
-            int inside_border_vertical_spacing,
-            int between_child_spacing);
-  virtual ~BoxLayout();
-
-  void set_main_axis_alignment(MainAxisAlignment main_axis_alignment) {
-    main_axis_alignment_ = main_axis_alignment;
-  }
-
-  void set_cross_axis_alignment(CrossAxisAlignment cross_axis_alignment) {
-    cross_axis_alignment_ = cross_axis_alignment;
-  }
-
-  void set_inside_border_insets(const gfx::Insets& insets) {
-    inside_border_insets_ = insets;
-  }
-
-  void set_minimum_cross_axis_size(int size) {
-    minimum_cross_axis_size_ = size;
-  }
-
-  // Sets the flex weight for the given |view|. Using the preferred size as
-  // the basis, free space along the main axis is distributed to views in the
-  // ratio of their flex weights. Similarly, if the views will overflow the
-  // parent, space is subtracted in these ratios.
-  //
-  // A flex of 0 means this view is not resized. Flex values must not be
-  // negative.
-  void SetFlexForView(const View* view, int flex);
-
-  // Clears the flex for the given |view|, causing it to use the default
-  // flex.
-  void ClearFlexForView(const View* view);
-
-  // Sets the flex for views to use when none is specified.
-  void SetDefaultFlex(int default_flex);
-
-  // Overridden from views::LayoutManager:
-  virtual void Installed(View* host) override;
-  virtual void Uninstalled(View* host) override;
-  virtual void ViewRemoved(View* host, View* view) override;
-  virtual void Layout(View* host) override;
-  virtual gfx::Size GetPreferredSize(const View* host) const override;
-  virtual int GetPreferredHeightForWidth(const View* host,
-                                         int width) const override;
-
- private:
-  // Returns the flex for the specified |view|.
-  int GetFlexForView(const View* view) const;
-
-  // Returns the size and position along the main axis of |rect|.
-  int MainAxisSize(const gfx::Rect& rect) const;
-  int MainAxisPosition(const gfx::Rect& rect) const;
-
-  // Sets the size and position along the main axis of |rect|.
-  void SetMainAxisSize(int size, gfx::Rect* rect) const;
-  void SetMainAxisPosition(int position, gfx::Rect* rect) const;
-
-  // Returns the size and position along the cross axis of |rect|.
-  int CrossAxisSize(const gfx::Rect& rect) const;
-  int CrossAxisPosition(const gfx::Rect& rect) const;
-
-  // Sets the size and position along the cross axis of |rect|.
-  void SetCrossAxisSize(int size, gfx::Rect* rect) const;
-  void SetCrossAxisPosition(int size, gfx::Rect* rect) const;
-
-  // Returns the main axis size for the given view. |child_area_width| is needed
-  // to calculate the height of the view when the orientation is vertical.
-  int MainAxisSizeForView(const View* view, int child_area_width) const;
-
-  // Returns the cross axis size for the given view.
-  int CrossAxisSizeForView(const View* view) const;
-
-  // The preferred size for the dialog given the width of the child area.
-  gfx::Size GetPreferredSizeForChildWidth(const View* host,
-                                          int child_area_width) const;
-
-  // The amount of space the layout requires in addition to any space for the
-  // child views.
-  gfx::Size NonChildSize(const View* host) const;
-
-  const Orientation orientation_;
-
-  // Spacing between child views and host view border.
-  gfx::Insets inside_border_insets_;
-
-  // Spacing to put in between child views.
-  const int between_child_spacing_;
-
-  // The alignment of children in the main axis. This is
-  // MAIN_AXIS_ALIGNMENT_START by default.
-  MainAxisAlignment main_axis_alignment_;
-
-  // The alignment of children in the cross axis. This is
-  // CROSS_AXIS_ALIGNMENT_STRETCH by default.
-  CrossAxisAlignment cross_axis_alignment_;
-
-  // A map of views to their flex weights.
-  std::map<const View*, int> flex_map_;
-
-  // The flex weight for views if none is set. Defaults to 0.
-  int default_flex_;
-
-  // The minimum cross axis size for the layout.
-  int minimum_cross_axis_size_;
-
-  // The view that this BoxLayout is managing the layout for.
-  views::View* host_;
-
-  DISALLOW_IMPLICIT_CONSTRUCTORS(BoxLayout);
-};
-
-} // namespace views
-
-#endif  // UI_VIEWS_LAYOUT_BOX_LAYOUT_H_