Moves handful of files to ash/wm/common

ash/wm/window_state.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_WINDOW_STATE_H_
-#define ASH_WM_WINDOW_STATE_H_
-
-#include <memory>
-
-#include "ash/ash_export.h"
-#include "ash/wm/common/wm_types.h"
-#include "ash/wm/drag_details.h"
-#include "base/gtest_prod_util.h"
-#include "base/macros.h"
-#include "base/observer_list.h"
-#include "ui/base/ui_base_types.h"
-
-namespace aura {
-class Window;
-}
-
-namespace gfx {
-class Rect;
-}
-
-namespace ash {
-class LockWindowState;
-class MaximizeModeWindowState;
-
-namespace wm {
-class WindowStateDelegate;
-class WindowStateObserver;
-class WMEvent;
-class WmWindow;
-
-// WindowState manages and defines ash specific window state and
-// behavior. Ash specific per-window state (such as ones that controls
-// window manager behavior) and ash specific window behavior (such as
-// maximize, minimize, snap sizing etc) should be added here instead
-// of defining separate functions (like |MaximizeWindow(aura::Window*
-// window)|) or using aura Window property.
-// The WindowState gets created when first accessed by
-// |wm::GetWindowState|, and deleted when the window is deleted.
-// Prefer using this class instead of passing aura::Window* around in
-// ash code as this is often what you need to interact with, and
-// accessing the window using |window()| is cheap.
-class ASH_EXPORT WindowState {
- public:
-
-  // A subclass of State class represents one of the window's states
-  // that corresponds to WindowStateType in Ash environment, e.g.
-  // maximized, minimized or side snapped, as subclass.
-  // Each subclass defines its own behavior and transition for each WMEvent.
-  class State {
-   public:
-    State() {}
-    virtual ~State() {}
-
-    // Update WindowState based on |event|.
-    virtual void OnWMEvent(WindowState* window_state, const WMEvent* event) = 0;
-
-    virtual WindowStateType GetType() const = 0;
-
-    // Gets called when the state object became active and the managed window
-    // needs to be adjusted to the State's requirement.
-    // The passed |previous_state| may be used to properly implement state
-    // transitions such as bound animations from the previous state.
-    // Note: This only gets called when the state object gets changed.
-    virtual void AttachState(WindowState* window_state,
-                             State* previous_state) = 0;
-
-    // Gets called before the state objects gets deactivated / detached from the
-    // window, so that it can save the various states it is interested in.
-    // Note: This only gets called when the state object gets changed.
-    virtual void DetachState(WindowState* window_state) = 0;
-
-   private:
-    DISALLOW_COPY_AND_ASSIGN(State);
-  };
-
-  // Call GetWindowState() to instantiate this class.
-  ~WindowState();
-
-  WmWindow* window() { return window_; }
-  const WmWindow* window() const { return window_; }
-
-  bool HasDelegate() const;
-  void SetDelegate(std::unique_ptr<WindowStateDelegate> delegate);
-
-  // Returns the window's current ash state type.
-  // Refer to WindowStateType definition in wm_types.h as for why Ash
-  // has its own state type.
-  WindowStateType GetStateType() const;
-
-  // Predicates to check window state.
-  bool IsMinimized() const;
-  bool IsMaximized() const;
-  bool IsFullscreen() const;
-  bool IsMaximizedOrFullscreen() const;
-  bool IsSnapped() const;
-
-  // True if the window's state type is WINDOW_STATE_TYPE_NORMAL or
-  // WINDOW_STATE_TYPE_DEFAULT.
-  bool IsNormalStateType() const;
-
-  bool IsNormalOrSnapped() const;
-
-  bool IsActive() const;
-  bool IsDocked() const;
-
-  // Returns true if the window's location can be controlled by the user.
-  bool IsUserPositionable() const;
-
-  // Checks if the window can change its state accordingly.
-  bool CanMaximize() const;
-  bool CanMinimize() const;
-  bool CanResize() const;
-  bool CanSnap() const;
-  bool CanActivate() const;
-
-  // Returns true if the window has restore bounds.
-  bool HasRestoreBounds() const;
-
-  // These methods use aura::WindowProperty to change the window's state
-  // instead of using WMEvent directly. This is to use the same mechanism as
-  // what views::Widget is using.
-  void Maximize();
-  void Minimize();
-  void Unminimize();
-
-  void Activate();
-  void Deactivate();
-
-  // Set the window state to normal.
-  // TODO(oshima): Change to use RESTORE event.
-  void Restore();
-
-  // Caches, then disables always on top state and then stacks |window_| below
-  // |window_on_top| if a |window_| is currently in always on top state.
-  void DisableAlwaysOnTop(WmWindow* window_on_top);
-
-  // Restores always on top state that a window might have cached.
-  void RestoreAlwaysOnTop();
-
-  // Invoked when a WMevent occurs, which drives the internal
-  // state machine.
-  void OnWMEvent(const WMEvent* event);
-
-  // TODO(oshima): Try hiding these methods and making them accessible only to
-  // state impl. State changes should happen through events (as much
-  // as possible).
-
-  // Saves the current bounds to be used as a restore bounds.
-  void SaveCurrentBoundsForRestore();
-
-  // Same as |GetRestoreBoundsInScreen| except that it returns the
-  // bounds in the parent's coordinates.
-  gfx::Rect GetRestoreBoundsInParent() const;
-
-  // Returns the restore bounds property on the window in the virtual screen
-  // coordinates. The bounds can be NULL if the bounds property does not
-  // exist for the window. The window owns the bounds object.
-  gfx::Rect GetRestoreBoundsInScreen() const;
-
-  // Same as |SetRestoreBoundsInScreen| except that the bounds is in the
-  // parent's coordinates.
-  void SetRestoreBoundsInParent(const gfx::Rect& bounds_in_parent);
-
-  // Sets the restore bounds property on the window in the virtual screen
-  // coordinates.  Deletes existing bounds value if exists.
-  void SetRestoreBoundsInScreen(const gfx::Rect& bounds_in_screen);
-
-  // Deletes and clears the restore bounds property on the window.
-  void ClearRestoreBounds();
-
-  // Replace the State object of a window with a state handler which can
-  // implement a new window manager type. The passed object will be owned
-  // by this object and the returned object will be owned by the caller.
-  std::unique_ptr<State> SetStateObject(std::unique_ptr<State> new_state);
-
-  // True if the window should be unminimized to the restore bounds, as
-  // opposed to the window's current bounds. |unminimized_to_restore_bounds_| is
-  // reset to the default value after the window is unminimized.
-  bool unminimize_to_restore_bounds() const {
-    return unminimize_to_restore_bounds_;
-  }
-  void set_unminimize_to_restore_bounds(bool value) {
-    unminimize_to_restore_bounds_ = value;
-  }
-
-  // Gets/sets whether the shelf should be hidden when this window is
-  // fullscreen.
-  bool hide_shelf_when_fullscreen() const {
-    return hide_shelf_when_fullscreen_;
-  }
-
-  void set_hide_shelf_when_fullscreen(bool value) {
-    hide_shelf_when_fullscreen_ = value;
-  }
-
-  // If the minimum visibility is true, ash will try to keep a
-  // minimum amount of the window is always visible on the work area
-  // when shown.
-  // TODO(oshima): Consolidate this and window_position_managed
-  // into single parameter to control the window placement.
-  bool minimum_visibility() const {
-    return minimum_visibility_;
-  }
-  void set_minimum_visibility(bool minimum_visibility) {
-    minimum_visibility_ = minimum_visibility;
-  }
-
-  // Specifies if the window can be dragged by the user via the caption or not.
-  bool can_be_dragged() const {
-    return can_be_dragged_;
-  }
-  void set_can_be_dragged(bool can_be_dragged) {
-    can_be_dragged_ = can_be_dragged;
-  }
-
-  // Gets/Sets the bounds of the window before it was moved by the auto window
-  // management. As long as it was not auto-managed, it will return NULL.
-  const gfx::Rect* pre_auto_manage_window_bounds() const {
-    return pre_auto_manage_window_bounds_.get();
-  }
-  void SetPreAutoManageWindowBounds(const gfx::Rect& bounds);
-
-  // Layout related properties
-
-  void AddObserver(WindowStateObserver* observer);
-  void RemoveObserver(WindowStateObserver* observer);
-
-  // Whether the window is being dragged.
-  bool is_dragged() const { return !!drag_details_; }
-
-  // Whether or not the window's position can be managed by the
-  // auto management logic.
-  bool window_position_managed() const { return window_position_managed_; }
-  void set_window_position_managed(bool window_position_managed) {
-    window_position_managed_ = window_position_managed;
-  }
-
-  // Whether or not the window's position or size was changed by a user.
-  bool bounds_changed_by_user() const { return bounds_changed_by_user_; }
-  void set_bounds_changed_by_user(bool bounds_changed_by_user);
-
-  // True if this window is an attached panel.
-  bool panel_attached() const {
-    return panel_attached_;
-  }
-  void set_panel_attached(bool panel_attached) {
-    panel_attached_ = panel_attached;
-  }
-
-  // True if the window is ignored by the shelf layout manager for
-  // purposes of darkening the shelf.
-  bool ignored_by_shelf() const { return ignored_by_shelf_; }
-  void set_ignored_by_shelf(bool ignored_by_shelf) {
-    ignored_by_shelf_ = ignored_by_shelf;
-  }
-
-  // True if the window should be offered a chance to consume special system
-  // keys such as brightness, volume, etc. that are usually handled by the
-  // shell.
-  bool can_consume_system_keys() const { return can_consume_system_keys_; }
-  void set_can_consume_system_keys(bool can_consume_system_keys) {
-    can_consume_system_keys_ = can_consume_system_keys;
-  }
-
-  // True if this window has requested that the top-row keys (back, forward,
-  // brightness, volume) should be treated as function keys.
-  bool top_row_keys_are_function_keys() const {
-    return top_row_keys_are_function_keys_;
-  }
-  void set_top_row_keys_are_function_keys(bool value) {
-    top_row_keys_are_function_keys_ = value;
-  }
-
-  // True if the window is in "immersive full screen mode" which is slightly
-  // different from the normal fullscreen mode by allowing the user to reveal
-  // the top portion of the window through a touch / mouse gesture. It might
-  // also allow the shelf to be shown in some situations.
-  bool in_immersive_fullscreen() const {
-    return in_immersive_fullscreen_;
-  }
-  void set_in_immersive_fullscreen(bool enable) {
-    in_immersive_fullscreen_ = enable;
-  }
-
-  // Creates and takes ownership of a pointer to DragDetails when resizing is
-  // active. This should be done before a resizer gets created.
-  void CreateDragDetails(const gfx::Point& point_in_parent,
-                         int window_component,
-                         aura::client::WindowMoveSource source);
-
-  // Deletes and clears a pointer to DragDetails. This should be done when the
-  // resizer gets destroyed.
-  void DeleteDragDetails();
-
-  // Sets the currently stored restore bounds and clears the restore bounds.
-  void SetAndClearRestoreBounds();
-
-  // Returns a pointer to DragDetails during drag operations.
-  const DragDetails* drag_details() const { return drag_details_.get(); }
-  DragDetails* drag_details() { return drag_details_.get(); }
-
-  // Called from the associated WmWindow once the show state changes.
-  void OnWindowShowStateChanged();
-
- private:
-  friend class DefaultState;
-  friend class ash::LockWindowState;
-  friend class ash::MaximizeModeWindowState;
-  friend ASH_EXPORT WindowState* GetWindowState(aura::Window*);
-  FRIEND_TEST_ALL_PREFIXES(WindowAnimationsTest, CrossFadeToBounds);
-  FRIEND_TEST_ALL_PREFIXES(WindowAnimationsTest,
-                           CrossFadeToBoundsFromTransform);
-
-  explicit WindowState(WmWindow* window);
-
-  WindowStateDelegate* delegate() { return delegate_.get(); }
-
-  // Returns the window's current always_on_top state.
-  bool GetAlwaysOnTop() const;
-
-  // Returns the window's current show state.
-  ui::WindowShowState GetShowState() const;
-
-  // Sets the window's bounds in screen coordinates.
-  void SetBoundsInScreen(const gfx::Rect& bounds_in_screen);
-
-  // Adjusts the |bounds| so that they are flush with the edge of the
-  // workspace if the window represented by |window_state| is side snapped.
-  void AdjustSnappedBounds(gfx::Rect* bounds);
-
-  // Updates the window show state according to the current window state type.
-  // Note that this does not update the window bounds.
-  void UpdateWindowShowStateFromStateType();
-
-  void NotifyPreStateTypeChange(WindowStateType old_window_state_type);
-  void NotifyPostStateTypeChange(WindowStateType old_window_state_type);
-
-  // Sets |bounds| as is and ensure the layer is aligned with pixel boundary.
-  void SetBoundsDirect(const gfx::Rect& bounds);
-
-  // Sets the window's |bounds| with constraint where the size of the
-  // new bounds will not exceeds the size of the work area.
-  void SetBoundsConstrained(const gfx::Rect& bounds);
-
-  // Sets the wndow's |bounds| and transitions to the new bounds with
-  // a scale animation.
-  void SetBoundsDirectAnimated(const gfx::Rect& bounds);
-
-  // Sets the window's |bounds| and transition to the new bounds with
-  // a cross fade animation.
-  void SetBoundsDirectCrossFade(const gfx::Rect& bounds);
-
-  // The owner of this window settings.
-  WmWindow* window_;
-  std::unique_ptr<WindowStateDelegate> delegate_;
-
-  bool window_position_managed_;
-  bool bounds_changed_by_user_;
-  bool panel_attached_;
-  bool ignored_by_shelf_;
-  bool can_consume_system_keys_;
-  bool top_row_keys_are_function_keys_;
-  std::unique_ptr<DragDetails> drag_details_;
-
-  bool unminimize_to_restore_bounds_;
-  bool in_immersive_fullscreen_;
-  bool hide_shelf_when_fullscreen_;
-  bool minimum_visibility_;
-  bool can_be_dragged_;
-  bool cached_always_on_top_;
-
-  // A property to remember the window position which was set before the
-  // auto window position manager changed the window bounds, so that it can get
-  // restored when only this one window gets shown.
-  std::unique_ptr<gfx::Rect> pre_auto_manage_window_bounds_;
-
-  base::ObserverList<WindowStateObserver> observer_list_;
-
-  // True to ignore a property change event to avoid reentrance in
-  // UpdateWindowStateType()
-  bool ignore_property_change_;
-
-  std::unique_ptr<State> current_state_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowState);
-};
-
-}  // namespace wm
-}  // namespace ash
-
-#endif  // ASH_WM_WINDOW_STATE_H_