Moves common code in ash/wm/overview to ash/common/wm/overview

ash/wm/overview/scoped_transform_overview_window.h

-// Copyright 2013 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_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
-#define ASH_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_
-
-#include <memory>
-#include <vector>
-
-#include "ash/ash_export.h"
-#include "ash/wm/overview/overview_animation_type.h"
-#include "base/macros.h"
-#include "ui/gfx/geometry/size.h"
-#include "ui/gfx/transform.h"
-
-namespace gfx {
-class Rect;
-}
-
-namespace ash {
-
-class ScopedOverviewAnimationSettings;
-class WmWindow;
-
-// Manages a window, and it's transient children, in the overview mode. This
-// class allows transforming the windows with a helper to determine the best
-// fit in certain bounds. The window's state is restored on destruction of this
-// object.
-class ASH_EXPORT ScopedTransformOverviewWindow {
- public:
-  using ScopedAnimationSettings =
-      std::vector<std::unique_ptr<ScopedOverviewAnimationSettings>>;
-
-  // Calculates and returns an optimal scale ratio. With MD this is only
-  // taking into account |size.height()| as the width can vary. Without MD this
-  // returns the scale that allows the item to fully fit within |size|.
-  static float GetItemScale(const gfx::Size& source,
-                            const gfx::Size& target,
-                            int top_view_inset,
-                            int title_height);
-
-  // Returns |rect| having been shrunk to fit within |bounds| (preserving the
-  // aspect ratio). Takes into account a window header that is |top_view_inset|
-  // tall in the original window getting replaced by a window caption that is
-  // |title_height| tall in transformed window.
-  static gfx::Rect ShrinkRectToFitPreservingAspectRatio(const gfx::Rect& rect,
-                                                        const gfx::Rect& bounds,
-                                                        int top_view_inset,
-                                                        int title_height);
-
-  // Returns the transform turning |src_rect| into |dst_rect|.
-  static gfx::Transform GetTransformForRect(const gfx::Rect& src_rect,
-                                            const gfx::Rect& dst_rect);
-
-  explicit ScopedTransformOverviewWindow(WmWindow* window);
-  ~ScopedTransformOverviewWindow();
-
-  gfx::Transform get_overview_transform() const { return overview_transform_; }
-
-  void set_overview_transform(const gfx::Transform& transform) {
-    overview_transform_ = transform;
-  }
-
-  // Starts an animation sequence which will use animation settings specified by
-  // |animation_type|. The |animation_settings| container is populated with
-  // scoped entities and the container should be destroyed at the end of the
-  // animation sequence.
-  //
-  // Example:
-  //  ScopedTransformOverviewWindow overview_window(window);
-  //  ScopedTransformOverviewWindow::ScopedAnimationSettings scoped_settings;
-  //  overview_window.BeginScopedAnimation(
-  //      OverviewAnimationType::OVERVIEW_ANIMATION_SELECTOR_ITEM_SCROLL_CANCEL,
-  //      &animation_settings);
-  //  // Calls to SetTransform & SetOpacity will use the same animation settings
-  //  // until scoped_settings is destroyed.
-  //  overview_window.SetTransform(root_window, new_transform);
-  //  overview_window.SetOpacity(1);
-  void BeginScopedAnimation(
-      OverviewAnimationType animation_type,
-      ScopedAnimationSettings* animation_settings);
-
-  // Returns true if this window selector window contains the |target|.
-  bool Contains(const WmWindow* target) const;
-
-  // Returns the original target bounds of all transformed windows.
-  gfx::Rect GetTargetBoundsInScreen() const;
-
-  // Restores and animates the managed window to it's non overview mode state.
-  void RestoreWindow();
-
-  // Forces the managed window to be shown (ie not hidden or minimized) when
-  // calling RestoreWindow().
-  void ShowWindowOnExit();
-
-  // Informs the ScopedTransformOverviewWindow that the window being watched was
-  // destroyed. This resets the internal window pointer.
-  void OnWindowDestroyed();
-
-  // Prepares for overview mode by doing any necessary actions before entering.
-  void PrepareForOverview();
-
-  // Applies the |transform| to the overview window and all of its transient
-  // children. With Material Design creates a mask layer with the bottom edge
-  // using rounded corners of |radius|.
-  void SetTransform(WmWindow* root_window,
-                    const gfx::Transform& transform,
-                    int radius);
-
-  // Set's the opacity of the managed windows.
-  void SetOpacity(float opacity);
-
-  WmWindow* window() const { return window_; }
-
-  // Closes the transient root of the window managed by |this|.
-  void Close();
-
- private:
-  class OverviewContentMask;
-
-  // Shows the window if it was minimized.
-  void ShowWindowIfMinimized();
-
-  // A weak pointer to the real window in the overview.
-  WmWindow* window_;
-
-  // Mask layer that hides the original window header.
-  std::unique_ptr<OverviewContentMask> mask_;
-
-  // If true, the window was minimized and should be restored if the window
-  // was not selected.
-  bool minimized_;
-
-  // Tracks if this window was ignored by the shelf.
-  bool ignored_by_shelf_;
-
-  // True if the window has been transformed for overview mode.
-  bool overview_started_;
-
-  // The original transform of the window before entering overview mode.
-  gfx::Transform original_transform_;
-
-  // Keeps track of the original transform used when |this| has been positioned
-  // during SelectorItem layout.
-  gfx::Transform overview_transform_;
-
-  // The original opacity of the window before entering overview mode.
-  float original_opacity_;
-
-  DISALLOW_COPY_AND_ASSIGN(ScopedTransformOverviewWindow);
-};
-
-}  // namespace ash
-
-#endif  // ASH_WM_OVERVIEW_SCOPED_TRANSFORM_OVERVIEW_WINDOW_H_