chromeos: Move files in //ash/common to //ash, part 1

ash/common/system/tray/tri_view.h

-// Copyright 2016 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 ASH_COMMON_SYSTEM_TRAY_TRI_VIEW_H_
-#define ASH_COMMON_SYSTEM_TRAY_TRI_VIEW_H_
-
-#include <memory>
-
-#include "ash/ash_export.h"
-#include "base/macros.h"
-#include "ui/gfx/geometry/insets.h"
-#include "ui/gfx/geometry/size.h"
-#include "ui/views/view.h"
-
-namespace views {
-class Border;
-class BoxLayout;
-class LayoutManager;
-}  // namespace views
-
-namespace ash {
-class SizeRangeLayout;
-
-// A View which has 3 child containers (START, CENTER, END) which can be
-// arranged vertically or horizontally. The child containers can have minimum
-// and/or maximum preferred size defined as well as a flex weight that is used
-// to distribute excess space across the main axis, i.e. flexible width for the
-// horizontal orientation. By default all the containers have a flex weight of
-// 0, meaning no flexibility, and no minimum or maximum size.
-//
-// Child views should not be added to |this| directly via View::AddChildView()
-// or View::AddChildViewAt() and will fail a DCHECK() if attempted.
-//
-// Views added to the containers are laid out as per the LayoutManager that has
-// been installed on that container. By default a BoxLayout manager is installed
-// on each container with the same orientation as |this| has been created with.
-// The default BoxLayout will use a center alignment for both the main axis and
-// cross axis alignment.
-class ASH_EXPORT TriView : public views::View {
- public:
-  enum class Orientation {
-    HORIZONTAL,
-    VERTICAL,
-  };
-
-  // The different containers that child Views can be added to.
-  enum class Container { START = 0, CENTER = 1, END = 2 };
-
-  // Constructs a layout with horizontal orientation and 0 padding between
-  // containers.
-  TriView();
-
-  // Creates |this| with a Horizontal orientation and the specified padding
-  // between containers.
-  //
-  // TODO(bruthig): The |padding_between_containers| can only be set on
-  // BoxLayouts during construction. Investigate whether this can be a mutable
-  // property of BoxLayouts and if so consider dropping it as a constructor
-  // parameter here.
-  explicit TriView(int padding_between_containers);
-
-  // Creates |this| with the specified orientation and 0 padding between
-  // containers.
-  explicit TriView(Orientation orientation);
-
-  // Creates this with the specified |orientation| and
-  // |padding_between_containers|.
-  TriView(Orientation orientation, int padding_between_containers);
-
-  ~TriView() override;
-
-  // Set the minimum height for all containers to |height|.
-  void SetMinHeight(int height);
-
-  // Set the minimum size for the given |container|.
-  void SetMinSize(Container container, const gfx::Size& size);
-
-  // Get the minimum size for the given |container|.
-  gfx::Size GetMinSize(Container container);
-
-  // Set the maximum size for the given |container|.
-  void SetMaxSize(Container container, const gfx::Size& size);
-
-  // Adds the child |view| to the specified |container|.
-  void AddView(Container container, views::View* view);
-
-  // Removes all the children from the specified |container|. If
-  // |delete_children| is true, the views are deleted, unless marked as not
-  // parent owned.
-  void RemoveAllChildren(Container container, bool delete_children);
-
-  // During layout the |insets| are applied to the host views entire space
-  // before allocating the remaining space to the container views.
-  void SetInsets(const gfx::Insets& insets);
-
-  // Sets the border for the given |container|.
-  void SetContainerBorder(Container container,
-                          std::unique_ptr<views::Border> border);
-
-  // Sets whether the |container| is visible. During a layout the space will be
-  // allocated to the visible containers only. i.e. non-visible containers will
-  // not be allocated any space.
-  void SetContainerVisible(Container container, bool visible);
-
-  // Sets the flex weight for the given |container|. 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.
-  //
-  // Note that non-zero flex values will take precedence over size constraints.
-  // i.e. even if |container| has a max size set the space allocated during
-  // layout may be larger if |flex| > 0 and similar for min size constraints.
-  void SetFlexForContainer(Container container, int flex);
-
-  // Sets the |layout_manager| used by the given |container|.
-  void SetContainerLayout(Container container,
-                          std::unique_ptr<views::LayoutManager> layout_manager);
-
- protected:
-  // View:
-  void ViewHierarchyChanged(
-      const views::View::ViewHierarchyChangedDetails& details) override;
-  const char* GetClassName() const override;
-
- private:
-  friend class TriViewTest;
-
-  // Returns the View for the given |container|.
-  views::View* GetContainer(Container container);
-
-  // Returns the layout manager for the given |container|.
-  SizeRangeLayout* GetLayoutManager(Container container);
-
-  // Type spcific layout manager installed on |this|. Responsible for laying out
-  // the container Views.
-  views::BoxLayout* box_layout_;
-
-  SizeRangeLayout* start_container_layout_manager_;
-  SizeRangeLayout* center_container_layout_manager_;
-  SizeRangeLayout* end_container_layout_manager_;
-
-  // In order to detect direct manipulation of child views the
-  // ViewHierarchyChanged() event override fails on a DCHECK. However, we need
-  // to manipulate the child views during construction/destruction so this flag
-  // is used to disable the DCHECK during construction/destruction.
-  bool enable_hierarchy_changed_dcheck_ = false;
-
-  DISALLOW_COPY_AND_ASSIGN(TriView);
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_SYSTEM_TRAY_TRI_VIEW_H_