layout/xul/nsXULPopupManager.h
author Tyler Maklebust <maklebus@msu.edu>
Mon, 26 Dec 2016 10:50:28 -0500
changeset 453921 fec15f0d5be6840b7e5007fb239039b20756c66e
parent 447722 70791e56e69ae0ce66c430a6e453eff5aeeef09e
child 485276 d280a7a149bba92ecdb59b9de0a0336c336de889
permissions -rw-r--r--
Bug 1309935 - Add ability to find within select dropdown when over 40 elements. r?jaws, mconley, enndeakin Search implemented for select dropdown options. List navigation takes keyboard input as before, until search field is focused. Pref added to enable search (dom.forms.selectSearch). Task added to test search functionality. MozReview-Commit-ID: BiKRvNbQnxx

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/**
 * The XUL Popup Manager keeps track of all open popups.
 */

#ifndef nsXULPopupManager_h__
#define nsXULPopupManager_h__

#include "mozilla/Logging.h"
#include "nsIContent.h"
#include "nsIRollupListener.h"
#include "nsIDOMEventListener.h"
#include "nsPoint.h"
#include "nsCOMPtr.h"
#include "nsTArray.h"
#include "nsIObserver.h"
#include "nsITimer.h"
#include "nsIReflowCallback.h"
#include "nsThreadUtils.h"
#include "nsStyleConsts.h"
#include "nsWidgetInitData.h"
#include "mozilla/Attributes.h"
#include "Units.h"

// X.h defines KeyPress
#ifdef KeyPress
#undef KeyPress
#endif

/**
 * There are two types that are used:
 *   - dismissable popups such as menus, which should close up when there is a
 *     click outside the popup. In this situation, the entire chain of menus
 *     above should also be closed.
 *   - panels, which stay open until a request is made to close them. This
 *     type is used by tooltips.
 *
 * When a new popup is opened, it is appended to the popup chain, stored in a
 * linked list in mPopups for dismissable menus and panels or mNoHidePanels
 * for tooltips and panels with noautohide="true".
 * Popups are stored in this list linked from newest to oldest. When a click
 * occurs outside one of the open dismissable popups, the chain is closed by
 * calling Rollup.
 */

class nsContainerFrame;
class nsMenuFrame;
class nsMenuPopupFrame;
class nsMenuBarFrame;
class nsMenuParent;
class nsIDOMKeyEvent;
class nsIDocShellTreeItem;
class nsPIDOMWindowOuter;

// when a menu command is executed, the closemenu attribute may be used
// to define how the menu should be closed up
enum CloseMenuMode {
  CloseMenuMode_Auto, // close up the chain of menus, default value
  CloseMenuMode_None, // don't close up any menus
  CloseMenuMode_Single // close up only the menu the command is inside
};

/**
 * nsNavigationDirection: an enum expressing navigation through the menus in
 * terms which are independent of the directionality of the chrome. The
 * terminology, derived from XSL-FO and CSS3 (e.g. 
 * http://www.w3.org/TR/css3-text/#TextLayout), is BASE (Before, After, Start,
 * End), with the addition of First and Last (mapped to Home and End
 * respectively).
 *
 * In languages such as English where the inline progression is left-to-right
 * and the block progression is top-to-bottom (lr-tb), these terms will map out
 * as in the following diagram
 *
 *  --- inline progression --->
 *
 *           First              |
 *           ...                |
 *           Before             |
 *         +--------+         block
 *   Start |        | End  progression
 *         +--------+           |
 *           After              |
 *           ...                |
 *           Last               V
 * 
 */

enum nsNavigationDirection {
  eNavigationDirection_Last,
  eNavigationDirection_First,
  eNavigationDirection_Start,
  eNavigationDirection_Before,
  eNavigationDirection_End,
  eNavigationDirection_After
};

enum nsIgnoreKeys {
  eIgnoreKeys_False,
  eIgnoreKeys_True,
  eIgnoreKeys_Shortcuts,
};

#define NS_DIRECTION_IS_INLINE(dir) (dir == eNavigationDirection_Start ||     \
                                     dir == eNavigationDirection_End)
#define NS_DIRECTION_IS_BLOCK(dir) (dir == eNavigationDirection_Before || \
                                    dir == eNavigationDirection_After)
#define NS_DIRECTION_IS_BLOCK_TO_EDGE(dir) (dir == eNavigationDirection_First ||    \
                                            dir == eNavigationDirection_Last)

static_assert(NS_STYLE_DIRECTION_LTR == 0 && NS_STYLE_DIRECTION_RTL == 1,
              "Left to Right should be 0 and Right to Left should be 1");

/**
 * DirectionFromKeyCodeTable: two arrays, the first for left-to-right and the
 * other for right-to-left, that map keycodes to values of
 * nsNavigationDirection.
 */
extern const nsNavigationDirection DirectionFromKeyCodeTable[2][6];

#define NS_DIRECTION_FROM_KEY_CODE(frame, keycode)                     \
  (DirectionFromKeyCodeTable[frame->StyleVisibility()->mDirection]  \
                            [keycode - nsIDOMKeyEvent::DOM_VK_END])

// nsMenuChainItem holds info about an open popup. Items are stored in a
// doubly linked list. Note that the linked list is stored beginning from
// the lowest child in a chain of menus, as this is the active submenu.
class nsMenuChainItem
{
private:
  nsMenuPopupFrame* mFrame; // the popup frame
  nsPopupType mPopupType; // the popup type of the frame
  bool mIsContext; // true for context menus
  bool mOnMenuBar; // true if the menu is on a menu bar
  nsIgnoreKeys mIgnoreKeys; // indicates how keyboard listeners should be used

  nsMenuChainItem* mParent;
  nsMenuChainItem* mChild;

public:
  nsMenuChainItem(nsMenuPopupFrame* aFrame, bool aIsContext, nsPopupType aPopupType)
    : mFrame(aFrame),
      mPopupType(aPopupType),
      mIsContext(aIsContext),
      mOnMenuBar(false),
      mIgnoreKeys(eIgnoreKeys_False),
      mParent(nullptr),
      mChild(nullptr)
  {
    NS_ASSERTION(aFrame, "null frame passed to nsMenuChainItem constructor");
    MOZ_COUNT_CTOR(nsMenuChainItem);
  }

  ~nsMenuChainItem()
  {
    MOZ_COUNT_DTOR(nsMenuChainItem);
  }

  nsIContent* Content();
  nsMenuPopupFrame* Frame() { return mFrame; }
  nsPopupType PopupType() { return mPopupType; }
  bool IsMenu() { return mPopupType == ePopupTypeMenu; }
  bool IsContextMenu() { return mIsContext; }
  nsIgnoreKeys IgnoreKeys() { return mIgnoreKeys; }
  void SetIgnoreKeys(nsIgnoreKeys aIgnoreKeys) { mIgnoreKeys = aIgnoreKeys; }
  bool IsOnMenuBar() { return mOnMenuBar; }
  void SetOnMenuBar(bool aOnMenuBar) { mOnMenuBar = aOnMenuBar; }
  nsMenuChainItem* GetParent() { return mParent; }
  nsMenuChainItem* GetChild() { return mChild; }

  // set the parent of this item to aParent, also changing the parent
  // to have this as a child.
  void SetParent(nsMenuChainItem* aParent);

  // removes an item from the chain. The root pointer must be supplied in case
  // the item is the first item in the chain in which case the pointer will be
  // set to the next item, or null if there isn't another item. After detaching,
  // this item will not have a parent or a child.
  void Detach(nsMenuChainItem** aRoot);
};

// this class is used for dispatching popupshowing events asynchronously.
class nsXULPopupShowingEvent : public mozilla::Runnable
{
public:
  nsXULPopupShowingEvent(nsIContent *aPopup,
                         bool aIsContextMenu,
                         bool aSelectFirstItem)
    : mPopup(aPopup),
      mIsContextMenu(aIsContextMenu),
      mSelectFirstItem(aSelectFirstItem)
  {
    NS_ASSERTION(aPopup, "null popup supplied to nsXULPopupShowingEvent constructor");
  }

  NS_IMETHOD Run() override;

private:
  nsCOMPtr<nsIContent> mPopup;
  bool mIsContextMenu;
  bool mSelectFirstItem;
};

// this class is used for dispatching popuphiding events asynchronously.
class nsXULPopupHidingEvent : public mozilla::Runnable
{
public:
  nsXULPopupHidingEvent(nsIContent *aPopup,
                        nsIContent* aNextPopup,
                        nsIContent* aLastPopup,
                        nsPopupType aPopupType,
                        bool aDeselectMenu,
                        bool aIsCancel)
    : mPopup(aPopup),
      mNextPopup(aNextPopup),
      mLastPopup(aLastPopup),
      mPopupType(aPopupType),
      mDeselectMenu(aDeselectMenu),
      mIsRollup(aIsCancel)
  {
    NS_ASSERTION(aPopup, "null popup supplied to nsXULPopupHidingEvent constructor");
    // aNextPopup and aLastPopup may be null
  }

  NS_IMETHOD Run() override;

private:
  nsCOMPtr<nsIContent> mPopup;
  nsCOMPtr<nsIContent> mNextPopup;
  nsCOMPtr<nsIContent> mLastPopup;
  nsPopupType mPopupType;
  bool mDeselectMenu;
  bool mIsRollup;
};

// this class is used for dispatching popuppositioned events asynchronously.
class nsXULPopupPositionedEvent : public mozilla::Runnable
{
public:
  explicit nsXULPopupPositionedEvent(nsIContent *aPopup,
                                     bool aIsContextMenu,
                                     bool aSelectFirstItem)
    : mPopup(aPopup)
    , mIsContextMenu(aIsContextMenu)
    , mSelectFirstItem(aSelectFirstItem)
  {
    NS_ASSERTION(aPopup, "null popup supplied to nsXULPopupShowingEvent constructor");
  }

  NS_IMETHOD Run() override;

  // Asynchronously dispatch a popuppositioned event at aPopup if this is a
  // panel that should receieve such events. Return true if the event was sent.
  static bool DispatchIfNeeded(nsIContent *aPopup,
                               bool aIsContextMenu,
                               bool aSelectFirstItem);

private:
  nsCOMPtr<nsIContent> mPopup;
  bool mIsContextMenu;
  bool mSelectFirstItem;
};

// this class is used for dispatching menu command events asynchronously.
class nsXULMenuCommandEvent : public mozilla::Runnable
{
public:
  nsXULMenuCommandEvent(nsIContent *aMenu,
                        bool aIsTrusted,
                        bool aShift,
                        bool aControl,
                        bool aAlt,
                        bool aMeta,
                        bool aUserInput,
                        bool aFlipChecked)
    : mMenu(aMenu),
      mIsTrusted(aIsTrusted),
      mShift(aShift),
      mControl(aControl),
      mAlt(aAlt),
      mMeta(aMeta),
      mUserInput(aUserInput),
      mFlipChecked(aFlipChecked),
      mCloseMenuMode(CloseMenuMode_Auto)
  {
    NS_ASSERTION(aMenu, "null menu supplied to nsXULMenuCommandEvent constructor");
  }

  NS_IMETHOD Run() override;

  void SetCloseMenuMode(CloseMenuMode aCloseMenuMode) { mCloseMenuMode = aCloseMenuMode; }

private:
  nsCOMPtr<nsIContent> mMenu;
  bool mIsTrusted;
  bool mShift;
  bool mControl;
  bool mAlt;
  bool mMeta;
  bool mUserInput;
  bool mFlipChecked;
  CloseMenuMode mCloseMenuMode;
};

class nsXULPopupManager final : public nsIDOMEventListener,
                                public nsIRollupListener,
                                public nsITimerCallback,
                                public nsIObserver
{

public:
  friend class nsXULPopupShowingEvent;
  friend class nsXULPopupHidingEvent;
  friend class nsXULPopupPositionedEvent;
  friend class nsXULMenuCommandEvent;
  friend class TransitionEnder;

  NS_DECL_ISUPPORTS
  NS_DECL_NSIOBSERVER
  NS_DECL_NSITIMERCALLBACK
  NS_DECL_NSIDOMEVENTLISTENER

  // nsIRollupListener
  virtual bool Rollup(uint32_t aCount, bool aFlush,
                      const nsIntPoint* pos, nsIContent** aLastRolledUp) override;
  virtual bool ShouldRollupOnMouseWheelEvent() override;
  virtual bool ShouldConsumeOnMouseWheelEvent() override;
  virtual bool ShouldRollupOnMouseActivate() override;
  virtual uint32_t GetSubmenuWidgetChain(nsTArray<nsIWidget*> *aWidgetChain) override;
  virtual void NotifyGeometryChange() override {}
  virtual nsIWidget* GetRollupWidget() override;

  static nsXULPopupManager* sInstance;

  // initialize and shutdown methods called by nsLayoutStatics
  static nsresult Init();
  static void Shutdown();

  // returns a weak reference to the popup manager instance, could return null
  // if a popup manager could not be allocated
  static nsXULPopupManager* GetInstance();

  // This should be called when a window is moved or resized to adjust the
  // popups accordingly.
  void AdjustPopupsOnWindowChange(nsPIDOMWindowOuter* aWindow);
  void AdjustPopupsOnWindowChange(nsIPresShell* aPresShell);

  // given a menu frame, find the prevous or next menu frame. If aPopup is
  // true then navigate a menupopup, from one item on the menu to the previous
  // or next one. This is used for cursor navigation between items in a popup
  // menu. If aIsPopup is false, the navigation is on a menubar, so navigate
  // between menus on the menubar. This is used for left/right cursor navigation.
  //
  // Items that are not valid, such as non-menu or non-menuitem elements are
  // skipped, and the next or previous item after that is checked.
  //
  // If aStart is null, the first valid item is retrieved by GetNextMenuItem
  // and the last valid item is retrieved by GetPreviousMenuItem.
  //
  // Both methods will loop around the beginning or end if needed.
  //
  // aParent - the parent menubar or menupopup
  // aStart - the menu/menuitem to start navigation from. GetPreviousMenuItem
  //          returns the item before it, while GetNextMenuItem returns the
  //          item after it.
  // aIsPopup - true for menupopups, false for menubars
  // aWrap - true to wrap around to the beginning and continue searching if not
  //         found. False to end at the beginning or end of the menu.
  static nsMenuFrame* GetPreviousMenuItem(nsContainerFrame* aParent,
                                          nsMenuFrame* aStart,
                                          bool aIsPopup,
                                          bool aWrap);
  static nsMenuFrame* GetNextMenuItem(nsContainerFrame* aParent,
                                      nsMenuFrame* aStart,
                                      bool aIsPopup,
                                      bool aWrap);

  // returns true if the menu item aContent is a valid menuitem which may
  // be navigated to. aIsPopup should be true for items on a popup, or false
  // for items on a menubar.
  static bool IsValidMenuItem(nsIContent* aContent, bool aOnPopup);

  // inform the popup manager that a menu bar has been activated or deactivated,
  // either because one of its menus has opened or closed, or that the menubar
  // has been focused such that its menus may be navigated with the keyboard.
  // aActivate should be true when the menubar should be focused, and false
  // when the active menu bar should be defocused. In the latter case, if
  // aMenuBar isn't currently active, yet another menu bar is, that menu bar
  // will remain active.
  void SetActiveMenuBar(nsMenuBarFrame* aMenuBar, bool aActivate);

  // retrieve the node and offset of the last mouse event used to open a
  // context menu. This information is determined from the rangeParent and
  // the rangeOffset of the event supplied to ShowPopup or ShowPopupAtScreen.
  // This is used by the implementation of nsIDOMXULDocument::GetPopupRangeParent
  // and nsIDOMXULDocument::GetPopupRangeOffset.
  void GetMouseLocation(nsIDOMNode** aNode, int32_t* aOffset);

  /**
   * Open a <menu> given its content node. If aSelectFirstItem is
   * set to true, the first item on the menu will automatically be
   * selected. If aAsynchronous is true, the event will be dispatched
   * asynchronously. This should be true when called from frame code.
   */
  void ShowMenu(nsIContent *aMenu, bool aSelectFirstItem, bool aAsynchronous);

  /**
   * Open a popup, either anchored or unanchored. If aSelectFirstItem is
   * true, then the first item in the menu is selected. The arguments are
   * similar to those for nsIPopupBoxObject::OpenPopup.
   *
   * aTriggerEvent should be the event that triggered the event. This is used
   * to determine the coordinates and trigger node for the popup. This may be
   * null if the popup was not triggered by an event.
   *
   * This fires the popupshowing event synchronously.
   */
  void ShowPopup(nsIContent* aPopup,
                 nsIContent* aAnchorContent,
                 const nsAString& aPosition,
                 int32_t aXPos, int32_t aYPos,
                 bool aIsContextMenu,
                 bool aAttributesOverride,
                 bool aSelectFirstItem,
                 nsIDOMEvent* aTriggerEvent);

  /**
   * Open a popup at a specific screen position specified by aXPos and aYPos,
   * measured in CSS pixels.
   *
   * This fires the popupshowing event synchronously.
   * 
   * If aIsContextMenu is true, the popup is positioned at a slight
   * offset from aXPos/aYPos to ensure that it is not under the mouse
   * cursor.
   */
  void ShowPopupAtScreen(nsIContent* aPopup,
                         int32_t aXPos, int32_t aYPos,
                         bool aIsContextMenu,
                         nsIDOMEvent* aTriggerEvent);

  /* Open a popup anchored at a screen rectangle specified by aRect.
   * The remaining arguments are similar to ShowPopup.
   */
  void ShowPopupAtScreenRect(nsIContent* aPopup,
                             const nsAString& aPosition,
                             const nsIntRect& aRect,
                             bool aIsContextMenu,
                             bool aAttributesOverride,
                             nsIDOMEvent* aTriggerEvent);

  /**
   * Open a tooltip at a specific screen position specified by aXPos and aYPos,
   * measured in CSS pixels.
   *
   * This fires the popupshowing event synchronously.
   */
  void ShowTooltipAtScreen(nsIContent* aPopup,
                           nsIContent* aTriggerContent,
                           int32_t aXPos, int32_t aYPos);

  /**
   * This method is provided only for compatibility with an older popup API.
   * New code should not call this function and should call ShowPopup instead.
   *
   * This fires the popupshowing event synchronously.
   */
  void ShowPopupWithAnchorAlign(nsIContent* aPopup,
                                nsIContent* aAnchorContent,
                                nsAString& aAnchor,
                                nsAString& aAlign,
                                int32_t aXPos, int32_t aYPos,
                                bool aIsContextMenu);

  /*
   * Hide a popup aPopup. If the popup is in a <menu>, then also inform the
   * menu that the popup is being hidden.
   *
   * aHideChain - true if the entire chain of menus should be closed. If false,
   *              only this popup is closed.
   * aDeselectMenu - true if the parent <menu> of the popup should be deselected.
   *                 This will be false when the menu is closed by pressing the
   *                 Escape key.
   * aAsynchronous - true if the first popuphiding event should be sent
   *                 asynchrously. This should be true if HidePopup is called
   *                 from a frame.
   * aIsCancel - true if this popup is hiding due to being cancelled.
   * aLastPopup - optional popup to close last when hiding a chain of menus.
   *              If null, then all popups will be closed.
   */
  void HidePopup(nsIContent* aPopup,
                 bool aHideChain,
                 bool aDeselectMenu,
                 bool aAsynchronous,
                 bool aIsCancel,
                 nsIContent* aLastPopup = nullptr);

  /**
   * Hide the popup aFrame. This method is called by the view manager when the
   * close button is pressed.
   */
  void HidePopup(nsIFrame* aFrame);

  /**
   * Hide a popup after a short delay. This is used when rolling over menu items.
   * This timer is stored in mCloseTimer. The timer may be cancelled and the popup
   * closed by calling KillMenuTimer.
   */
  void HidePopupAfterDelay(nsMenuPopupFrame* aPopup);

  /**
   * Hide all of the popups from a given docshell. This should be called when the
   * document is hidden.
   */
  void HidePopupsInDocShell(nsIDocShellTreeItem* aDocShellToHide);

  /**
   * Enable or disable the dynamic noautohide state of a panel.
   *
   * aPanel - the panel whose state is to change
   * aShouldRollup - whether the panel is no longer noautohide
   */
  void EnableRollup(nsIContent* aPopup, bool aShouldRollup);

  /**
   * Execute a menu command from the triggering event aEvent.
   *
   * aMenu - a menuitem to execute
   * aEvent - an nsXULMenuCommandEvent that contains all the info from the mouse
   *          event which triggered the menu to be executed, may not be null
   */
  void ExecuteMenu(nsIContent* aMenu, nsXULMenuCommandEvent* aEvent);

  /**
   * Return true if the popup for the supplied content node is open.
   */
  bool IsPopupOpen(nsIContent* aPopup);

  /**
   * Return true if the popup for the supplied menu parent is open.
   */
  bool IsPopupOpenForMenuParent(nsMenuParent* aMenuParent);

  /**
   * Return the frame for the topmost open popup of a given type, or null if
   * no popup of that type is open. If aType is ePopupTypeAny, a menu of any
   * type is returned, except for popups in the mNoHidePanels list.
   */
  nsIFrame* GetTopPopup(nsPopupType aType);

  /**
   * Return an array of all the open and visible popup frames for
   * menus, in order from top to bottom.
   */
  void GetVisiblePopups(nsTArray<nsIFrame *>& aPopups);

  /**
   * Get the node that last triggered a popup or tooltip in the document
   * aDocument. aDocument must be non-null and be a document contained within
   * the same window hierarchy as the popup to retrieve.
   */
  already_AddRefed<nsIDOMNode> GetLastTriggerPopupNode(nsIDocument* aDocument)
  {
    return GetLastTriggerNode(aDocument, false);
  }

  already_AddRefed<nsIDOMNode> GetLastTriggerTooltipNode(nsIDocument* aDocument)
  {
    return GetLastTriggerNode(aDocument, true);
  }

  /**
   * Return false if a popup may not be opened. This will return false if the
   * popup is already open, if the popup is in a content shell that is not
   * focused, or if it is a submenu of another menu that isn't open.
   */
  bool MayShowPopup(nsMenuPopupFrame* aFrame);

  /**
   * Indicate that the popup associated with aView has been moved to the
   * specified screen coordiates.
   */
  void PopupMoved(nsIFrame* aFrame, nsIntPoint aPoint);

  /**
   * Indicate that the popup associated with aView has been resized to the
   * given device pixel size aSize.
   */
  void PopupResized(nsIFrame* aFrame, mozilla::LayoutDeviceIntSize aSize);

  /**
   * Called when a popup frame is destroyed. In this case, just remove the
   * item and later popups from the list. No point going through HidePopup as
   * the frames have gone away.
   */
  void PopupDestroyed(nsMenuPopupFrame* aFrame);

  /**
   * Returns true if there is a context menu open. If aPopup is specified,
   * then the context menu must be later in the chain than aPopup. If aPopup
   * is null, returns true if any context menu at all is open.
   */
  bool HasContextMenu(nsMenuPopupFrame* aPopup);

  /**
   * Update the commands for the menus within the menu popup for a given
   * content node. aPopup should be a XUL menupopup element. This method
   * changes attributes on the children of aPopup, and deals only with the
   * content of the popup, not the frames.
   */
  void UpdateMenuItems(nsIContent* aPopup);

  /**
   * Stop the timer which hides a popup after a delay, started by a previous
   * call to HidePopupAfterDelay. In addition, the popup awaiting to be hidden
   * is closed asynchronously.
   */
  void KillMenuTimer();

  /**
   * Cancel the timer which closes menus after delay, but only if the menu to
   * close is aMenuParent. When a submenu is opened, the user might move the
   * mouse over a sibling menuitem which would normally close the menu. This
   * menu is closed via a timer. However, if the user moves the mouse over the
   * submenu before the timer fires, we should instead cancel the timer. This
   * ensures that the user can move the mouse diagonally over a menu.
   */
  void CancelMenuTimer(nsMenuParent* aMenuParent);

  /**
   * Handles navigation for menu accelkeys. If aFrame is specified, then the
   * key is handled by that popup, otherwise if aFrame is null, the key is
   * handled by the active popup or menubar.
   */
  bool HandleShortcutNavigation(nsIDOMKeyEvent* aKeyEvent,
                                nsMenuPopupFrame* aFrame);

  /**
   * Handles cursor navigation within a menu. Returns true if the key has
   * been handled.
   */
  bool HandleKeyboardNavigation(uint32_t aKeyCode);

  /**
   * Handle keyboard navigation within a menu popup specified by aFrame.
   * Returns true if the key was handled and other default handling
   * should not occur.
   */
  bool HandleKeyboardNavigationInPopup(nsMenuPopupFrame* aFrame,
                                         nsNavigationDirection aDir)
  {
    return HandleKeyboardNavigationInPopup(nullptr, aFrame, aDir);
  }

  /**
   * Handles the keyboard event with keyCode value. Returns true if the event
   * has been handled.
   */
  bool HandleKeyboardEventWithKeyCode(nsIDOMKeyEvent* aKeyEvent,
                                      nsMenuChainItem* aTopVisibleMenuItem);

  // Sets mIgnoreKeys of the Top Visible Menu Item
  nsresult UpdateIgnoreKeys(bool aIgnoreKeys);

  nsresult KeyUp(nsIDOMKeyEvent* aKeyEvent);
  nsresult KeyDown(nsIDOMKeyEvent* aKeyEvent);
  nsresult KeyPress(nsIDOMKeyEvent* aKeyEvent);

protected:
  nsXULPopupManager();
  ~nsXULPopupManager();

  // get the nsMenuPopupFrame, if any, for the given content node
  nsMenuPopupFrame* GetPopupFrameForContent(nsIContent* aContent, bool aShouldFlush);

  // return the topmost menu, skipping over invisible popups
  nsMenuChainItem* GetTopVisibleMenu();

  // Hide all of the visible popups from the given list. This function can
  // cause style changes and frame destruction.
  void HidePopupsInList(const nsTArray<nsMenuPopupFrame *> &aFrames);

  // set the event that was used to trigger the popup, or null to clear the
  // event details. aTriggerContent will be set to the target of the event.
  void InitTriggerEvent(nsIDOMEvent* aEvent, nsIContent* aPopup, nsIContent** aTriggerContent);

  // callbacks for ShowPopup and HidePopup as events may be done asynchronously
  void ShowPopupCallback(nsIContent* aPopup,
                         nsMenuPopupFrame* aPopupFrame,
                         bool aIsContextMenu,
                         bool aSelectFirstItem);
  void HidePopupCallback(nsIContent* aPopup,
                         nsMenuPopupFrame* aPopupFrame,
                         nsIContent* aNextPopup,
                         nsIContent* aLastPopup,
                         nsPopupType aPopupType,
                         bool aDeselectMenu);

  /**
   * Fire a popupshowing event on the popup and then open the popup.
   *
   * aPopup - the popup to open
   * aIsContextMenu - true for context menus
   * aSelectFirstItem - true to select the first item in the menu
   */
  void FirePopupShowingEvent(nsIContent* aPopup,
                             bool aIsContextMenu,
                             bool aSelectFirstItem);

  /**
   * Fire a popuphiding event and then hide the popup. This will be called
   * recursively if aNextPopup and aLastPopup are set in order to hide a chain
   * of open menus. If these are not set, only one popup is closed. However,
   * if the popup type indicates a menu, yet the next popup is not a menu,
   * then this ends the closing of popups. This allows a menulist inside a
   * non-menu to close up the menu but not close up the panel it is contained
   * within.
   *
   * The caller must keep a strong reference to aPopup, aNextPopup and aLastPopup.
   *
   * aPopup - the popup to hide
   * aNextPopup - the next popup to hide
   * aLastPopup - the last popup in the chain to hide
   * aPresContext - nsPresContext for the popup's frame
   * aPopupType - the PopupType of the frame. 
   * aDeselectMenu - true to unhighlight the menu when hiding it
   * aIsCancel - true if this popup is hiding due to being cancelled.
   */
  void FirePopupHidingEvent(nsIContent* aPopup,
                            nsIContent* aNextPopup,
                            nsIContent* aLastPopup,
                            nsPresContext *aPresContext,
                            nsPopupType aPopupType,
                            bool aDeselectMenu,
                            bool aIsCancel);

  /**
   * Handle keyboard navigation within a menu popup specified by aItem.
   */
  bool HandleKeyboardNavigationInPopup(nsMenuChainItem* aItem,
                                         nsNavigationDirection aDir)
  {
    return HandleKeyboardNavigationInPopup(aItem, aItem->Frame(), aDir);
  }

private:
  /**
   * Handle keyboard navigation within a menu popup aFrame. If aItem is
   * supplied, then it is expected to have a frame equal to aFrame.
   * If aItem is non-null, then the navigation may be redirected to
   * an open submenu if one exists. Returns true if the key was
   * handled and other default handling should not occur.
   */
  bool HandleKeyboardNavigationInPopup(nsMenuChainItem* aItem,
                                         nsMenuPopupFrame* aFrame,
                                         nsNavigationDirection aDir);

protected:

  already_AddRefed<nsIDOMNode> GetLastTriggerNode(nsIDocument* aDocument, bool aIsTooltip);

  /**
   * Set mouse capturing for the current popup. This traps mouse clicks that
   * occur outside the popup so that it can be closed up. aOldPopup should be
   * set to the popup that was previously the current popup.
   */
  void SetCaptureState(nsIContent *aOldPopup);

  /**
   * Key event listeners are attached to the document containing the current
   * menu for menu and shortcut navigation. Only one listener is needed at a
   * time, stored in mKeyListener, so switch it only if the document changes.
   * Having menus in different documents is very rare, so the listeners will
   * usually only be attached when the first menu opens and removed when all
   * menus have closed.
   *
   * This is also used when only a menubar is active without any open menus,
   * so that keyboard navigation between menus on the menubar may be done.
   */
  void UpdateKeyboardListeners();

  /*
   * Returns true if the docshell for aDoc is aExpected or a child of aExpected.
   */
  bool IsChildOfDocShell(nsIDocument* aDoc, nsIDocShellTreeItem* aExpected);

  // the document the key event listener is attached to
  nsCOMPtr<mozilla::dom::EventTarget> mKeyListener;

  // widget that is currently listening to rollup events
  nsCOMPtr<nsIWidget> mWidget;

  // range parent and offset set in SetTriggerEvent
  nsCOMPtr<nsIDOMNode> mRangeParent;
  int32_t mRangeOffset;
  // Device pixels relative to the showing popup's presshell's
  // root prescontext's root frame.
  mozilla::LayoutDeviceIntPoint mCachedMousePoint;

  // cached modifiers
  mozilla::Modifiers mCachedModifiers;

  // set to the currently active menu bar, if any
  nsMenuBarFrame* mActiveMenuBar;

  // linked list of normal menus and panels.
  nsMenuChainItem* mPopups;

  // linked list of noautohide panels and tooltips.
  nsMenuChainItem* mNoHidePanels;

  // timer used for HidePopupAfterDelay
  nsCOMPtr<nsITimer> mCloseTimer;

  // a popup that is waiting on the timer
  nsMenuPopupFrame* mTimerMenu;

  // the popup that is currently being opened, stored only during the
  // popupshowing event
  nsCOMPtr<nsIContent> mOpeningPopup;

  // If true, all popups won't hide automatically on blur
  static bool sDevtoolsDisableAutoHide;
};

#endif