Unifies the two tab dragging variants. I would have liked to better

chrome/browser/ui/views/tabs/tab_drag_controller2.h

Index: chrome/browser/ui/views/tabs/tab_drag_controller2.h
===================================================================
--- chrome/browser/ui/views/tabs/tab_drag_controller2.h	(revision 135842)
+++ chrome/browser/ui/views/tabs/tab_drag_controller2.h	(working copy)
@@ -1,395 +0,0 @@
-// 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 CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER2_H_
-#define CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER2_H_
-#pragma once
-
-#include <vector>
-
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
-#include "base/timer.h"
-#include "chrome/browser/tabs/tab_strip_model_observer.h"
-#include "chrome/browser/tabs/tab_strip_selection_model.h"
-#include "chrome/browser/ui/tabs/dock_info.h"
-#include "chrome/browser/ui/views/tabs/tab_drag_controller.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-#include "ui/gfx/rect.h"
-#include "ui/views/widget/widget.h"
-
-namespace views {
-class View;
-}  // namespace views
-
-class BaseTab;
-class Browser;
-class TabContentsWrapper;
-struct TabRendererData;
-class TabStripModel;
-
-// Implementation of TabDragController that creates a real Browser.
-class TabDragController2 : public TabDragController,
-                           public content::NotificationObserver,
-                           public MessageLoopForUI::Observer,
-                           public views::Widget::Observer,
-                           public TabStripModelObserver {
- public:
-  TabDragController2();
-  virtual ~TabDragController2();
-
-  // Initializes TabDragController2 to drag the tabs in |tabs| originating
-  // from |source_tabstrip|. |source_tab| is the tab that initiated the drag and
-  // is contained in |tabs|.  |mouse_offset| is the distance of the mouse
-  // pointer from the origin of the first tab in |tabs| and |source_tab_offset|
-  // the offset from |source_tab|. |source_tab_offset| is the horizontal distant
-  // for a horizontal tab strip, and the vertical distance for a vertical tab
-  // strip. |initial_selection_model| is the selection model before the drag
-  // started and is only non-empty if |source_tab| was not initially selected.
-  void Init(TabStrip* source_tabstrip,
-            BaseTab* source_tab,
-            const std::vector<BaseTab*>& tabs,
-            const gfx::Point& mouse_offset,
-            int source_tab_offset,
-            const TabStripSelectionModel& initial_selection_model);
-
-  // Returns true if there is an active TabDragController2 that is attached to
-  // |tab_strip|.
-  static bool IsActiveAndAttachedTo(TabStrip* tab_strip);
-
-  // Returns true if there is an active TabDragController2.
-  static bool IsActive();
-
- private:
-  class DockDisplayer;
-  friend class DockDisplayer;
-
-  typedef std::set<gfx::NativeView> DockWindows;
-
-  // Specifies what should happen when RunMoveLoop complets.
-  enum EndRunLoopBehavior {
-    // Indicates the drag should end.
-    END_RUN_LOOP_STOP_DRAGGING,
-
-    // Indicates the drag should continue.
-    END_RUN_LOOP_CONTINUE_DRAGGING
-  };
-
-  // Enumeration of the ways a drag session can end.
-  enum EndDragType {
-    // Drag session exited normally: the user released the mouse.
-    NORMAL,
-
-    // The drag session was canceled (alt-tab during drag, escape ...)
-    CANCELED,
-
-    // The tab (NavigationController) was destroyed during the drag.
-    TAB_DESTROYED
-  };
-
-  // Enumeration of the possible positions the detached tab may detach from.
-  enum DetachPosition {
-    DETACH_BEFORE,
-    DETACH_AFTER,
-    DETACH_ABOVE_OR_BELOW
-  };
-
-  // Stores the date associated with a single tab that is being dragged.
-  struct TabDragData {
-    TabDragData();
-    ~TabDragData();
-
-    // The TabContentsWrapper being dragged.
-    TabContentsWrapper* contents;
-
-    // This is the index of the tab in |source_tabstrip_| when the drag
-    // began. This is used to restore the previous state if the drag is aborted.
-    int source_model_index;
-
-    // If attached this is the tab in |attached_tabstrip_|.
-    BaseTab* attached_tab;
-
-    // Is the tab pinned?
-    bool pinned;
-  };
-
-  typedef std::vector<TabDragData> DragData;
-
-  // Sets |drag_data| from |tab|. This also registers for necessary
-  // notifications and resets the delegate of the TabContentsWrapper.
-  void InitTabDragData(BaseTab* tab, TabDragData* drag_data);
-
-  // TabDragController overrides;
-  virtual void Drag() OVERRIDE;
-  virtual void EndDrag(bool canceled) OVERRIDE;
-  virtual bool GetStartedDrag() const OVERRIDE;
-
-  // Overridden from content::NotificationObserver:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
-
-  // Overridden from MessageLoop::Observer:
-#if defined(OS_WIN) || defined(USE_AURA)
-  virtual base::EventStatus WillProcessEvent(
-      const base::NativeEvent& event) OVERRIDE;
-  virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE;
-#endif
-
-  // Overriden from views::Widget::Observer:
-  virtual void OnWidgetMoved(views::Widget* widget) OVERRIDE;
-
-  // Overriden from TabStripModelObserver:
-  virtual void TabStripEmpty() OVERRIDE;
-
-  // Initialize the offset used to calculate the position to create windows
-  // in |GetWindowCreatePoint|. This should only be invoked from |Init|.
-  void InitWindowCreatePoint(TabStrip* tab_strip);
-
-  // Returns the point where a detached window should be created given the
-  // current mouse position.
-  gfx::Point GetWindowCreatePoint() const;
-
-  void UpdateDockInfo(const gfx::Point& screen_point);
-
-  // Saves focus in the window that the drag initiated from. Focus will be
-  // restored appropriately if the drag ends within this same window.
-  void SaveFocus();
-
-  // Restore focus to the View that had focus before the drag was started, if
-  // the drag ends within the same Window as it began.
-  void RestoreFocus();
-
-  // Tests whether the position of the mouse is past a minimum elasticity
-  // threshold required to start a drag.
-  bool CanStartDrag() const;
-
-  // Move the DraggedTabView according to the current mouse screen position,
-  // potentially updating the source and other TabStrips.
-  void ContinueDragging();
-
-  // Handles dragging tabs while the tabs are attached.
-  void MoveAttached(const gfx::Point& screen_point);
-
-  // Returns the DetachPosition given the specified location in screen
-  // coordinates.
-  DetachPosition GetDetachPosition(const gfx::Point& screen_point);
-
-  // Returns the TabStrip for the specified window, or NULL if one doesn't exist
-  // or isn't appropriate.
-  TabStrip* GetTabStripForWindow(gfx::NativeWindow window);
-
-  // Returns the compatible TabStrip that is under the specified point (screen
-  // coordinates), or NULL if there is none.
-  TabStrip* GetTabStripForPoint(const gfx::Point& screen_point);
-
-  DockInfo GetDockInfoAtPoint(const gfx::Point& screen_point);
-
-  // Returns true if |tabstrip| contains the specified point in screen
-  // coordinates.
-  bool DoesTabStripContain(TabStrip* tabstrip,
-                           const gfx::Point& screen_point) const;
-
-  // Attach the dragged Tab to the specified TabStrip.
-  void Attach(TabStrip* attached_tabstrip, const gfx::Point& screen_point);
-
-  // Detach the dragged Tab from the current TabStrip.
-  void Detach();
-
-  // Detaches the tabs being dragged, creates a new Browser to contain them and
-  // runs a nested move loop.
-  void DetachIntoNewBrowserAndRunMoveLoop(const gfx::Point& screen_point);
-
-  // Runs a nested message loop that handles moving the current Browser.
-  void RunMoveLoop();
-
-  // Returns the index where the dragged WebContents should be inserted into
-  // |attached_tabstrip_| given the DraggedTabView's bounds |dragged_bounds| in
-  // coordinates relative to |attached_tabstrip_| and has had the mirroring
-  // transformation applied.
-  // NOTE: this is invoked from |Attach| before the tabs have been inserted.
-  int GetInsertionIndexForDraggedBounds(const gfx::Rect& dragged_bounds) const;
-
-  // Retrieve the bounds of the DraggedTabView relative to the attached
-  // TabStrip. |tab_strip_point| is in the attached TabStrip's coordinate
-  // system.
-  gfx::Rect GetDraggedViewTabStripBounds(const gfx::Point& tab_strip_point);
-
-  // Get the position of the dragged tab view relative to the attached tab
-  // strip with the mirroring transform applied.
-  gfx::Point GetAttachedDragPoint(const gfx::Point& screen_point);
-
-  // Finds the Tabs within the specified TabStrip that corresponds to the
-  // WebContents of the dragged tabs. Returns an empty vector if not attached.
-  std::vector<BaseTab*> GetTabsMatchingDraggedContents(TabStrip* tabstrip);
-
-  // Does the work for EndDrag. If we actually started a drag and |how_end| is
-  // not TAB_DESTROYED then one of EndDrag or RevertDrag is invoked.
-  void EndDragImpl(EndDragType how_end);
-
-  // Reverts a cancelled drag operation.
-  void RevertDrag();
-
-  // Reverts the tab at |drag_index| in |drag_data_|.
-  void RevertDragAt(size_t drag_index);
-
-  // Selects the dragged tabs in |model|. Does nothing if there are no longer
-  // any dragged contents (as happens when a WebContents is deleted out from
-  // under us).
-  void ResetSelection(TabStripModel* model);
-
-  // Finishes a succesful drag operation.
-  void CompleteDrag();
-
-  // Utility for getting the mouse position in screen coordinates.
-  gfx::Point GetCursorScreenPoint() const;
-
-  // Returns the bounds (in screen coordinates) of the specified View.
-  gfx::Rect GetViewScreenBounds(views::View* tabstrip) const;
-
-  void DockDisplayerDestroyed(DockDisplayer* controller);
-
-  void BringWindowUnderMouseToFront();
-
-  // Convenience for getting the TabDragData corresponding to the tab the user
-  // started dragging.
-  TabDragData* source_tab_drag_data() {
-    return &(drag_data_[source_tab_index_]);
-  }
-
-  // Convenience for |source_tab_drag_data()->contents|.
-  TabContentsWrapper* source_dragged_contents() {
-    return source_tab_drag_data()->contents;
-  }
-
-  // Returns true if the tabs were originality one after the other in
-  // |source_tabstrip_|.
-  bool AreTabsConsecutive();
-
-  // Returns the TabStripModel for the specified tabstrip.
-  static TabStripModel* GetModel(TabStrip* tabstrip);
-
-  // Returns the Widget of the currently attached TabStrip's BrowserView.
-  views::Widget* GetAttachedBrowserWidget();
-
-  // Creates and returns a new Browser to handle the drag.
-  Browser* CreateBrowserForDrag(TabStrip* source,
-                                const gfx::Point& screen_point,
-                                std::vector<gfx::Rect>* drag_bounds);
-
-  // Marks whether |window| is constrained. While dragging we set this to false
-  // to allow maximized windows to move any where.
-  void SetTrackedByWorkspace(gfx::NativeWindow window, bool value);
-
-  // Handles registering for notifications.
-  content::NotificationRegistrar registrar_;
-
-  // The TabStrip the drag originated from. This is set to NULL if the source
-  // tabstrip is deleted while we're detached.
-  TabStrip* source_tabstrip_;
-
-  // The TabStrip the dragged Tab is currently attached to, or NULL if the
-  // dragged Tab is detached.
-  TabStrip* attached_tabstrip_;
-
-  // Set to true if we've detached from a tabstrip and are running a nested
-  // move message loop.
-  bool is_dragging_window_;
-
-  // The position of the mouse (in screen coordinates) at the start of the drag
-  // operation. This is used to calculate minimum elasticity before a
-  // DraggedTabView is constructed.
-  gfx::Point start_screen_point_;
-
-  // This is the offset of the mouse from the top left of the Tab where
-  // dragging begun. This is used to ensure that the dragged view is always
-  // positioned at the correct location during the drag, and to ensure that the
-  // detached window is created at the right location.
-  gfx::Point mouse_offset_;
-
-  // Offset of the mouse relative to the source tab.
-  int source_tab_offset_;
-
-  // Ratio of the x-coordinate of the |source_tab_offset_| to the width of the
-  // tab. Not used for vertical tabs.
-  float offset_to_width_ratio_;
-
-  // A hint to use when positioning new windows created by detaching Tabs. This
-  // is the distance of the mouse from the top left of the dragged tab as if it
-  // were the distance of the mouse from the top left of the first tab in the
-  // attached TabStrip from the top left of the window.
-  // TODO(sky): clean this up, can likely be removed.
-  gfx::Point window_create_point_;
-
-  // Location of the first tab in the source tabstrip in screen coordinates.
-  // This is used to calculate window_create_point_.
-  gfx::Point first_source_tab_point_;
-
-  // The bounds of the browser window before the last Tab was detached. When
-  // the last Tab is detached, rather than destroying the frame (which would
-  // abort the drag session), the frame is moved off-screen. If the drag is
-  // aborted (e.g. by the user pressing Esc, or capture being lost), the Tab is
-  // attached to the hidden frame and the frame moved back to these bounds.
-  gfx::Rect restore_bounds_;
-
-  // The last view that had focus in the window containing |source_tab_|. This
-  // is saved so that focus can be restored properly when a drag begins and
-  // ends within this same window.
-  views::View* old_focused_view_;
-
-  // The position along the major axis of the mouse cursor in screen coordinates
-  // at the time of the last re-order event.
-  int last_move_screen_loc_;
-
-  DockInfo dock_info_;
-
-  DockWindows dock_windows_;
-
-  std::vector<DockDisplayer*> dock_controllers_;
-
-  // Timer used to bring the window under the cursor to front. If the user
-  // stops moving the mouse for a brief time over a browser window, it is
-  // brought to front.
-  base::OneShotTimer<TabDragController2> bring_to_front_timer_;
-
-  // Did the mouse move enough that we started a drag?
-  bool started_drag_;
-
-  // Is the drag active?
-  bool active_;
-
-  DragData drag_data_;
-
-  // Index of the source tab in drag_data_.
-  size_t source_tab_index_;
-
-  // True until |MoveAttached| is invoked once.
-  bool initial_move_;
-
-  // The selection model before the drag started. See comment above Init() for
-  // details.
-  TabStripSelectionModel initial_selection_model_;
-
-  // The selection model of |attached_tabstrip_| before the tabs were attached.
-  TabStripSelectionModel selection_model_before_attach_;
-
-  EndRunLoopBehavior end_run_loop_behavior_;
-
-  // If true, we're waiting for a move loop to complete.
-  bool waiting_for_run_loop_to_exit_;
-
-  // The TabStrip to attach to after the move loop completes.
-  TabStrip* tab_strip_to_attach_to_after_exit_;
-
-  // Non-null for the duration of RunMoveLoop.
-  views::Widget* move_loop_widget_;
-
-  // If non-null set to true from destructor.
-  bool* destroyed_;
-
-  DISALLOW_COPY_AND_ASSIGN(TabDragController2);
-};
-
-#endif  // CHROME_BROWSER_UI_VIEWS_TABS_TAB_DRAG_CONTROLLER2_H_