content: package com.android.internal.view.menu;
  
  import java.lang.annotation.Retention;
  import java.lang.annotation.RetentionPolicy;
  import java.util.ArrayList;
  import java.util.LinkedList;
  import java.util.List;
  
  import android.annotation.AttrRes;
  import android.annotation.IntDef;
  import android.annotation.NonNull;
  import android.annotation.Nullable;
  import android.annotation.StyleRes;
  import android.content.Context;
  import android.content.res.Resources;
  import android.graphics.Rect;
  import android.os.Handler;
  import android.os.Parcelable;
  import android.os.SystemClock;
  import android.view.Gravity;
  import android.view.KeyEvent;
  import android.view.LayoutInflater;
  import android.view.MenuItem;
  import android.view.View;
  import android.view.ViewTreeObserver;
  import android.view.View.OnAttachStateChangeListener;
  import android.view.View.OnKeyListener;
  import android.view.ViewTreeObserver.OnGlobalLayoutListener;
  import android.widget.AbsListView;
  import android.widget.FrameLayout;
  import android.widget.HeaderViewListAdapter;
  import android.widget.ListAdapter;
  import android.widget.MenuItemHoverListener;
  import android.widget.ListView;
  import android.widget.MenuPopupWindow;
  import android.widget.PopupWindow;
  import android.widget.PopupWindow.OnDismissListener;
  import android.widget.TextView;
  
  import com.android.internal.R;
  import com.android.internal.util.Preconditions;
  
  /**
   * A popup for a menu which will allow multiple submenus to appear in a cascading fashion, side by
   * side.
   * @hide
   */
  final class CascadingMenuPopup extends MenuPopup implements MenuPresenter, OnKeyListener,
          PopupWindow.OnDismissListener {
      private static final int ITEM_LAYOUT = com.android.internal.R.layout.cascading_menu_item_layout;
  
      @Retention(RetentionPolicy.SOURCE)
      @IntDef({HORIZ_POSITION_LEFT, HORIZ_POSITION_RIGHT})
      public @interface HorizPosition {}
  
      private static final int HORIZ_POSITION_LEFT = 0;
      private static final int HORIZ_POSITION_RIGHT = 1;
  
      /**
       * Delay between hovering over a menu item with a mouse and receiving
       * side-effects (ex. opening a sub-menu or closing unrelated menus).
       */
      private static final int SUBMENU_TIMEOUT_MS = 200;
  
      private final Context mContext;
      private final int mMenuMaxWidth;
      private final int mPopupStyleAttr;
      private final int mPopupStyleRes;
      private final boolean mOverflowOnly;
      private final Handler mSubMenuHoverHandler;
  
      /** List of menus that were added before this popup was shown. */
      private final List<MenuBuilder> mPendingMenus = new LinkedList<>();
  
      /**
       * List of open menus. The first item is the root menu and each
       * subsequent item is a direct submenu of the previous item.
       */
      private final List<CascadingMenuInfo> mShowingMenus = new ArrayList<>();
  
      private final OnGlobalLayoutListener mGlobalLayoutListener = new OnGlobalLayoutListener() {
          @Override
          public void onGlobalLayout() {
              // Only move the popup if it's showing and non-modal. We don't want
              // to be moving around the only interactive window, since there's a
              // good chance the user is interacting with it.
              if (isShowing() && mShowingMenus.size() > 0
                      && !mShowingMenus.get(0).window.isModal()) {
                  final View anchor = mShownAnchorView;
                  if (anchor == null || !anchor.isShown()) {
                      dismiss();
                  } else {
                      // Recompute window sizes and positions.
                      for (CascadingMenuInfo info : mShowingMenus) {
                          info.window.show();
                      }
                  }
              }
          }
      };
  
      private final OnAttachStateChangeListener mAttachStateChangeListener =
              new OnAttachStateChangeListener() {
                  @Override
                  public void onViewAttachedToWindow(View v) {
                  }
  
                  @Override
                  public void onViewDetachedFromWindow(View v) {
                      if (mTreeObserver != null) {
                          if (!mTreeObserver.isAlive()) {
                              mTreeObserver = v.getViewTreeObserver();
                          }
                          mTreeObserver.removeGlobalOnLayoutListener(mGlobalLayoutListener);
                      }
                      v.removeOnAttachStateChangeListener(this);
                  }
              };
  
      private final MenuItemHoverListener mMenuItemHoverListener = new MenuItemHoverListener() {
          @Override
          public void onItemHoverExit(@NonNull MenuBuilder menu, @NonNull MenuItem item) {
              // If the mouse moves between two windows, hover enter/exit pairs
              // may be received out of order. So, instead of canceling all
              // pending runnables, only cancel runnables for the host menu.
              mSubMenuHoverHandler.removeCallbacksAndMessages(menu);
          }
  
          @Override
          public void onItemHoverEnter(
                  @NonNull final MenuBuilder menu, @NonNull final MenuItem item) {
              // Something new was hovered, cancel all scheduled runnables.
              mSubMenuHoverHandler.removeCallbacksAndMessages(null);
  
              // Find the position of the hovered menu within the added menus.
              int menuIndex = -1;
              for (int i = 0, count = mShowingMenus.size(); i < count; i++) {
                  if (menu == mShowingMenus.get(i).menu) {
                      menuIndex = i;
                      break;
                  }
              }
  
              if (menuIndex == -1) {
                  return;
              }
  
              final CascadingMenuInfo nextInfo;
              final int nextIndex = menuIndex + 1;
              if (nextIndex < mShowingMenus.size()) {
                  nextInfo = mShowingMenus.get(nextIndex);
              } else {
                  nextInfo = null;
              }
  
              final Runnable runnable = new Runnable() {
                  @Override
                  public void run() {
                      // Close any other submenus that might be open at the
                      // current or a deeper level.
                      if (nextInfo != null) {
                          // Disable exit animations to prevent overlapping
                          // fading out submenus.
                          mShouldCloseImmediately = true;
                          nextInfo.menu.close(false /* closeAllMenus */);
                          mShouldCloseImmediately = false;
                      }
  
                      // Then open the selected submenu, if there is one.
                      if (item.isEnabled() && item.hasSubMenu()) {
                          menu.performItemAction(item, 0);
                      }
                  }
              };
              final long uptimeMillis = SystemClock.uptimeMillis() + SUBMENU_TIMEOUT_MS;
              mSubMenuHoverHandler.postAtTime(runnable, menu, uptimeMillis);
          }
      };
  
      private int mRawDropDownGravity = Gravity.NO_GRAVITY;
      private int mDropDownGravity = Gravity.NO_GRAVITY;
      private View mAnchorView;
      private View mShownAnchorView;
      private int mLastPosition;
      private boolean mHasXOffset;
      private boolean mHasYOffset;
      private int mXOffset;
      private int mYOffset;
      private boolean mForceShowIcon;
      private boolean mShowTitle;
      private Callback mPresenterCallback;
      private ViewTreeObserver mTreeObserver;
      private PopupWindow.OnDismissListener mOnDismissListener;
  
      /** Whether popup menus should disable exit animations when closing. */
      private boolean mShouldCloseImmediately;
  
      /**
       * Initializes a new cascading-capable menu popup.
       *
       * @param anchor A parent view to get the {@link android.view.View#getWindowToken()} token from.
       */
      public CascadingMenuPopup(@NonNull Context context, @NonNull View anchor,
              @AttrRes int popupStyleAttr, @StyleRes int popupStyleRes, boolean overflowOnly) {
          mContext = Preconditions.checkNotNull(context);
          mAnchorView = Preconditions.checkNotNull(anchor);
          mPopupStyleAttr = popupStyleAttr;
          mPopupStyleRes = popupStyleRes;
          mOverflowOnly = overflowOnly;
  
          mForceShowIcon = false;
          mLastPosition = getInitialMenuPosition();
  
          final Resources res = context.getResources();
          mMenuMaxWidth = Math.max(res.getDisplayMetrics().widthPixels / 2,
                  res.getDimensionPixelSize(com.android.internal.R.dimen.config_prefDialogWidth));
  
          mSubMenuHoverHandler = new Handler();
      }
  
      @Override
      public void setForceShowIcon(boolean forceShow) {
          mForceShowIcon = forceShow;
      }
  
      private MenuPopupWindow createPopupWindow() {
          MenuPopupWindow popupWindow = new MenuPopupWindow(
                  mContext, null, mPopupStyleAttr, mPopupStyleRes);
          popupWindow.setHoverListener(mMenuItemHoverListener);
          popupWindow.setOnItemClickListener(this);
          popupWindow.setOnDismissListener(this);
          popupWindow.setAnchorView(mAnchorView);
          popupWindow.setDropDownGravity(mDropDownGravity);
          popupWindow.setModal(true);
          popupWindow.setInputMethodMode(PopupWindow.INPUT_METHOD_NOT_NEEDED);
          return popupWindow;
      }
  
      @Override
      public void show() {
          if (isShowing()) {
              return;
          }
  
          // Display all pending menus.
          for (MenuBuilder menu : mPendingMenus) {
              showMenu(menu);
          }
          mPendingMenus.clear();
  
          mShownAnchorView = mAnchorView;
  
          if (mShownAnchorView != null) {
              final boolean addGlobalListener = mTreeObserver == null;
              mTreeObserver = mShownAnchorView.getViewTreeObserver(); // Refresh to latest
              if (addGlobalListener) {
                  mTreeObserver.addOnGlobalLayoutListener(mGlobalLayoutListener);
              }
              mShownAnchorView.addOnAttachStateChangeListener(mAttachStateChangeListener);
          }
      }
  
      @Override
      public void dismiss() {
          // Need to make another list to avoid a concurrent modification
          // exception, as #onDismiss may clear mPopupWindows while we are
          // iterating. Remove from the last added menu so that the callbacks
          // are received in order from foreground to background.
          final int length = mShowingMenus.size();
          if (length > 0) {
              final CascadingMenuInfo[] addedMenus =
                      mShowingMenus.toArray(new CascadingMenuInfo[length]);
              for (int i = length - 1; i >= 0; i--) {
                  final CascadingMenuInfo info = addedMenus[i];
                  if (info.window.isShowing()) {
                      info.window.dismiss();
                  }
              }
          }
      }
  
      @Override
      public boolean onKey(View v, int keyCode, KeyEvent event) {
          if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_MENU) {
              dismiss();
              return true;
          }
          return false;
      }
  
      /**
       * Determines the proper initial menu position for the current LTR/RTL configuration.
       * @return The initial position.
       */
      @HorizPosition
      private int getInitialMenuPosition() {
          final int layoutDirection = mAnchorView.getLayoutDirection();
          return layoutDirection == View.LAYOUT_DIRECTION_RTL ? HORIZ_POSITION_LEFT :
                  HORIZ_POSITION_RIGHT;
      }
  
      /**
       * Determines whether the next submenu (of the given width) should display on the right or on
       * the left of the most recent menu.
       *
       * @param nextMenuWidth Width of the next submenu to display.
       * @return The position to display it.
       */
      @HorizPosition
      private int getNextMenuPosition(int nextMenuWidth) {
          ListView lastListView = mShowingMenus.get(mShowingMenus.size() - 1).getListView();
  
          final int[] screenLocation = new int[2];
          lastListView.getLocationOnScreen(screenLocation);
  
          final Rect displayFrame = new Rect();
          mShownAnchorView.getWindowVisibleDisplayFrame(displayFrame);
  
          if (mLastPosition == HORIZ_POSITION_RIGHT) {
              final int right = screenLocation[0] + lastListView.getWidth() + nextMenuWidth;
              if (right > displayFrame.right) {
                  return HORIZ_POSITION_LEFT;
              }
              return HORIZ_POSITION_RIGHT;
          } else { // LEFT
              final int left = screenLocation[0] - nextMenuWidth;
              if (left < 0) {
                  return HORIZ_POSITION_RIGHT;
              }
              return HORIZ_POSITION_LEFT;
          }
      }
  
      @Override
      public void addMenu(MenuBuilder menu) {
          menu.addMenuPresenter(this, mContext);
  
          if (isShowing()) {
              showMenu(menu);
          } else {
              mPendingMenus.add(menu);
          }
      }
  
      /**
       * Prepares and shows the specified menu immediately.
       *
       * @param menu the menu to show
       */
      private void showMenu(@NonNull MenuBuilder menu) {
          final LayoutInflater inflater = LayoutInflater.from(mContext);
          final MenuAdapter adapter = new MenuAdapter(menu, inflater, mOverflowOnly, ITEM_LAYOUT);
  
          // Apply "force show icon" setting. There are 3 cases:
          // (1) This is the top level menu and icon spacing is forced. Add spacing.
          // (2) This is a submenu. Add spacing if any of the visible menu items has an icon.
          // (3) This is the top level menu and icon spacing isn't forced. Do not add spacing.
          if (!isShowing() && mForceShowIcon) {
            // Case 1
            adapter.setForceShowIcon(true);
          } else if (isShowing()) {
            // Case 2
            adapter.setForceShowIcon(MenuPopup.shouldPreserveIconSpacing(menu));
          }
          // Case 3: Else, don't allow spacing for icons (default behavior; do nothing).
  
          final int menuWidth = measureIndividualMenuWidth(adapter, null, mContext, mMenuMaxWidth);
          final MenuPopupWindow popupWindow = createPopupWindow();
          popupWindow.setAdapter(adapter);
          popupWindow.setContentWidth(menuWidth);
          popupWindow.setDropDownGravity(mDropDownGravity);
  
          final CascadingMenuInfo parentInfo;
          final View parentView;
          if (mShowingMenus.size() > 0) {
              parentInfo = mShowingMenus.get(mShowingMenus.size() - 1);
              parentView = findParentViewForSubmenu(parentInfo, menu);
          } else {
              parentInfo = null;
              parentView = null;
          }
  
          if (parentView != null) {
              // This menu is a cascading submenu anchored to a parent view.
              popupWindow.setAnchorView(parentView);
              popupWindow.setTouchModal(false);
              popupWindow.setEnterTransition(null);
  
              final @HorizPosition int nextMenuPosition = getNextMenuPosition(menuWidth);
              final boolean showOnRight = nextMenuPosition == HORIZ_POSITION_RIGHT;
              mLastPosition = nextMenuPosition;
  
              // Compute the horizontal offset to display the submenu to the right or to the left
              // of the parent item.
              // By now, mDropDownGravity is the resolved absolute gravity, so
              // this should work in both LTR and RTL.
              final int x;
              if ((mDropDownGravity & Gravity.RIGHT) == Gravity.RIGHT) {
                  if (showOnRight) {
                      x = menuWidth;
                  } else {
                      x = -parentView.getWidth();
                  }
              } else {
                  if (showOnRight) {
                      x = parentView.getWidth();
                  } else {
                      x = -menuWidth;
                  }
              }
              popupWindow.setHorizontalOffset(x);
  
              // Align with the top edge of the parent view (or the bottom edge when the submenu is
              // flipped vertically).
              popupWindow.setOverlapAnchor(true);
              popupWindow.setVerticalOffset(0);
          } else {
              if (mHasXOffset) {
                  popupWindow.setHorizontalOffset(mXOffset);
              }
              if (mHasYOffset) {
                  popupWindow.setVerticalOffset(mYOffset);
              }
              final Rect epicenterBounds = getEpicenterBounds();
              popupWindow.setEpicenterBounds(epicenterBounds);
          }
  
  
          final CascadingMenuInfo menuInfo = new CascadingMenuInfo(popupWindow, menu, mLastPosition);
          mShowingMenus.add(menuInfo);
  
          popupWindow.show();
  
          final ListView listView = popupWindow.getListView();
          listView.setOnKeyListener(this);
  
          // If this is the root menu, show the title if requested.
          if (parentInfo == null && mShowTitle && menu.getHeaderTitle() != null) {
              final FrameLayout titleItemView = (FrameLayout) inflater.inflate(
                      R.layout.popup_menu_header_item_layout, listView, false);
              final TextView titleView = (TextView) titleItemView.findViewById(R.id.title);
              titleItemView.setEnabled(false);
              titleView.setText(menu.getHeaderTitle());
              listView.addHeaderView(titleItemView, null, false);
  
              // Show again to update the title.
              popupWindow.show();
          }
      }
  
      /**
       * Returns the menu item within the specified parent menu that owns
       * specified submenu.
       *
       * @param parent the parent menu
       * @param submenu the submenu for which the index should be returned
       * @return the menu item that owns the submenu, or {@code null} if not
       *         present
       */
      private MenuItem findMenuItemForSubmenu(
              @NonNull MenuBuilder parent, @NonNull MenuBuilder submenu) {
          for (int i = 0, count = parent.size(); i < count; i++) {
              final MenuItem item = parent.getItem(i);
              if (item.hasSubMenu() && submenu == item.getSubMenu()) {
                  return item;
              }
          }
  
          return null;
      }
  
      /**
       * Attempts to find the view for the menu item that owns the specified
       * submenu.
       *
       * @param parentInfo info for the parent menu
       * @param submenu the submenu whose parent view should be obtained
       * @return the parent view, or {@code null} if one could not be found
       */
      @Nullable
      private View findParentViewForSubmenu(
              @NonNull CascadingMenuInfo parentInfo, @NonNull MenuBuilder submenu) {
          final MenuItem owner = findMenuItemForSubmenu(parentInfo.menu, submenu);
          if (owner == null) {
              // Couldn't find the submenu owner.
              return null;
          }
  
          // The adapter may be wrapped. Adjust the index if necessary.
          final int headersCount;
          final MenuAdapter menuAdapter;
          final ListView listView = parentInfo.getListView();
          final ListAdapter listAdapter = listView.getAdapter();
          if (listAdapter instanceof HeaderViewListAdapter) {
              final HeaderViewListAdapter headerAdapter = (HeaderViewListAdapter) listAdapter;
              headersCount = headerAdapter.getHeadersCount();
              menuAdapter = (MenuAdapter) headerAdapter.getWrappedAdapter();
          } else {
              headersCount = 0;
              menuAdapter = (MenuAdapter) listAdapter;
          }
  
          // Find the index within the menu adapter's data set of the menu item.
          int ownerPosition = AbsListView.INVALID_POSITION;
          for (int i = 0, count = menuAdapter.getCount(); i < count; i++) {
              if (owner == menuAdapter.getItem(i)) {
                  ownerPosition = i;
                  break;
              }
          }
          if (ownerPosition == AbsListView.INVALID_POSITION) {
              // Couldn't find the owner within the menu adapter.
              return null;
          }
  
          // Adjust the index for the adapter used to display views.
          ownerPosition += headersCount;
  
          // Adjust the index for the visible views.
          final int ownerViewPosition = ownerPosition - listView.getFirstVisiblePosition();
          if (ownerViewPosition < 0 || ownerViewPosition >= listView.getChildCount()) {
              // Not visible on screen.
              return null;
          }
  
          return listView.getChildAt(ownerViewPosition);
      }
  
      /**
       * @return {@code true} if the popup is currently showing, {@code false} otherwise.
       */
      @Override
      public boolean isShowing() {
          return mShowingMenus.size() > 0 && mShowingMenus.get(0).window.isShowing();
      }
  
      /**
       * Called when one or more of the popup windows was dismissed.
       */
      @Override
      public void onDismiss() {
          // The dismiss listener doesn't pass the calling window, so walk
          // through the stack to figure out which one was just dismissed.
          CascadingMenuInfo dismissedInfo = null;
          for (int i = 0, count = mShowingMenus.size(); i < count; i++) {
              final CascadingMenuInfo info = mShowingMenus.get(i);
              if (!info.window.isShowing()) {
                  dismissedInfo = info;
                  break;
              }
          }
  
          // Close all menus starting from the dismissed menu, passing false
          // since we are manually closing only a subset of windows.
          if (dismissedInfo != null) {
              dismissedInfo.menu.close(false);
          }
      }
  
      @Override
      public void updateMenuView(boolean cleared) {
          for (CascadingMenuInfo info : mShowingMenus) {
              toMenuAdapter(info.getListView().getAdapter()).notifyDataSetChanged();
          }
      }
  
      @Override
      public void setCallback(Callback cb) {
          mPresenterCallback = cb;
      }
  
      @Override
      public boolean onSubMenuSelected(SubMenuBuilder subMenu) {
          // Don't allow double-opening of the same submenu.
          for (CascadingMenuInfo info : mShowingMenus) {
              if (subMenu == info.menu) {
                  // Just re-focus that one.
                  info.getListView().requestFocus();
                  return true;
              }
          }
  
          if (subMenu.hasVisibleItems()) {
              addMenu(subMenu);
  
              if (mPresenterCallback != null) {
                  mPresenterCallback.onOpenSubMenu(subMenu);
              }
              return true;
          }
          return false;
      }
  
      /**
       * Finds the index of the specified menu within the list of added menus.
       *
       * @param menu the menu to find
       * @return the index of the menu, or {@code -1} if not present
       */
      private int findIndexOfAddedMenu(@NonNull MenuBuilder menu) {
          for (int i = 0, count = mShowingMenus.size(); i < count; i++) {
              final CascadingMenuInfo info  = mShowingMenus.get(i);
              if (menu == info.menu) {
                  return i;
              }
          }
  
          return -1;
      }
  
      @Override
      public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) {
          final int menuIndex = findIndexOfAddedMenu(menu);
          if (menuIndex < 0) {
              return;
          }
  
          // Recursively close descendant menus.
          final int nextMenuIndex = menuIndex + 1;
          if (nextMenuIndex < mShowingMenus.size()) {
              final CascadingMenuInfo childInfo = mShowingMenus.get(nextMenuIndex);
              childInfo.menu.close(false /* closeAllMenus */);
          }
  
          // Close the target menu.
          final CascadingMenuInfo info = mShowingMenus.remove(menuIndex);
          info.menu.removeMenuPresenter(this);
          if (mShouldCloseImmediately) {
              // Disable all exit animations.
              info.window.setExitTransition(null);
              info.window.setAnimationStyle(0);
          }
          info.window.dismiss();
  
          final int count = mShowingMenus.size();
          if (count > 0) {
              mLastPosition = mShowingMenus.get(count - 1).position;
          } else {
              mLastPosition = getInitialMenuPosition();
          }
  
          if (count == 0) {
              // This was the last window. Clean up.
              dismiss();
  
              if (mPresenterCallback != null) {
                  mPresenterCallback.onCloseMenu(menu, true);
              }
  
              if (mTreeObserver != null) {
                  if (mTreeObserver.isAlive()) {
                      mTreeObserver.removeGlobalOnLayoutListener(mGlobalLayoutListener);
                  }
                  mTreeObserver = null;
              }
              mShownAnchorView.removeOnAttachStateChangeListener(mAttachStateChangeListener);
  
              // If every [sub]menu was dismissed, that means the whole thing was
              // dismissed, so notify the owner.
              mOnDismissListener.onDismiss();
          } else if (allMenusAreClosing) {
              // Close all menus starting from the root. This will recursively
              // close any remaining menus, so we don't need to propagate the
              // "closeAllMenus" flag. The last window will clean up.
              final CascadingMenuInfo rootInfo = mShowingMenus.get(0);
              rootInfo.menu.close(false /* closeAllMenus */);
          }
      }
  
      @Override
      public boolean flagActionItems() {
          return false;
      }
  
      @Override
      public Parcelable onSaveInstanceState() {
          return null;
      }
  
      @Override
      public void onRestoreInstanceState(Parcelable state) {
      }
  
      @Override
      public void setGravity(int dropDownGravity) {
          if (mRawDropDownGravity != dropDownGravity) {
              mRawDropDownGravity = dropDownGravity;
              mDropDownGravity = Gravity.getAbsoluteGravity(
                      dropDownGravity, mAnchorView.getLayoutDirection());
          }
      }
  
      @Override
      public void setAnchorView(@NonNull View anchor) {
          if (mAnchorView != anchor) {
              mAnchorView = anchor;
  
              // Gravity resolution may have changed, update from raw gravity.
              mDropDownGravity = Gravity.getAbsoluteGravity(
                      mRawDropDownGravity, mAnchorView.getLayoutDirection());
          }
      }
  
      @Override
      public void setOnDismissListener(OnDismissListener listener) {
          mOnDismissListener = listener;
      }
  
      @Override
      public ListView getListView() {
          return mShowingMenus.isEmpty() ? null : mShowingMenus.get(mShowingMenus.size() - 1).getListView();
      }
  
      @Override
      public void setHorizontalOffset(int x) {
          mHasXOffset = true;
          mXOffset = x;
      }
  
      @Override
      public void setVerticalOffset(int y) {
          mHasYOffset = true;
          mYOffset = y;
      }
  
      @Override
      public void setShowTitle(boolean showTitle) {
          mShowTitle = showTitle;
      }
  
      private static class CascadingMenuInfo {
          public final MenuPopupWindow window;
          public final MenuBuilder menu;
          public final int position;
  
          public CascadingMenuInfo(@NonNull MenuPopupWindow window, @NonNull MenuBuilder menu,
                  int position) {
              this.window = window;
              this.menu = menu;
              this.position = position;
          }
  
          public ListView getListView() {
              return window.getListView();
          }
      }
  }
  