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1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.support.v7.view.menu;
18
19import android.content.Context;
20import android.content.res.Resources;
21import android.graphics.Rect;
22import android.os.Handler;
23import android.os.Parcelable;
24import android.os.SystemClock;
25import android.support.annotation.AttrRes;
26import android.support.annotation.IntDef;
27import android.support.annotation.NonNull;
28import android.support.annotation.Nullable;
29import android.support.annotation.StyleRes;
30import android.support.v4.view.GravityCompat;
31import android.support.v4.view.ViewCompat;
32import android.support.v7.appcompat.R;
33import android.support.v7.widget.MenuItemHoverListener;
34import android.support.v7.widget.MenuPopupWindow;
35import android.view.Gravity;
36import android.view.KeyEvent;
37import android.view.LayoutInflater;
38import android.view.MenuItem;
39import android.view.View;
40import android.view.View.OnAttachStateChangeListener;
41import android.view.View.OnKeyListener;
42import android.view.ViewTreeObserver;
43import android.view.ViewTreeObserver.OnGlobalLayoutListener;
44import android.widget.AbsListView;
45import android.widget.FrameLayout;
46import android.widget.HeaderViewListAdapter;
47import android.widget.ListAdapter;
48import android.widget.ListView;
49import android.widget.PopupWindow;
50import android.widget.PopupWindow.OnDismissListener;
51import android.widget.TextView;
52
53import java.lang.annotation.Retention;
54import java.lang.annotation.RetentionPolicy;
55import java.util.ArrayList;
56import java.util.LinkedList;
57import java.util.List;
58
59/**
60 * A popup for a menu which will allow multiple submenus to appear in a cascading fashion, side by
61 * side.
62 */
63final class CascadingMenuPopup extends MenuPopup implements MenuPresenter, OnKeyListener,
64        PopupWindow.OnDismissListener {
65
66    @Retention(RetentionPolicy.SOURCE)
67    @IntDef({HORIZ_POSITION_LEFT, HORIZ_POSITION_RIGHT})
68    public @interface HorizPosition {}
69
70    private static final int HORIZ_POSITION_LEFT = 0;
71    private static final int HORIZ_POSITION_RIGHT = 1;
72
73    /**
74     * Delay between hovering over a menu item with a mouse and receiving
75     * side-effects (ex. opening a sub-menu or closing unrelated menus).
76     */
77    private static final int SUBMENU_TIMEOUT_MS = 200;
78
79    private final Context mContext;
80    private final int mMenuMaxWidth;
81    private final int mPopupStyleAttr;
82    private final int mPopupStyleRes;
83    private final boolean mOverflowOnly;
84    private final Handler mSubMenuHoverHandler;
85
86    /** List of menus that were added before this popup was shown. */
87    private final List<MenuBuilder> mPendingMenus = new LinkedList<>();
88
89    /**
90     * List of open menus. The first item is the root menu and each
91     * subsequent item is a direct submenu of the previous item.
92     */
93    private final List<CascadingMenuInfo> mShowingMenus = new ArrayList<>();
94
95    private final OnGlobalLayoutListener mGlobalLayoutListener = new OnGlobalLayoutListener() {
96        @Override
97        public void onGlobalLayout() {
98            // Only move the popup if it's showing and non-modal. We don't want
99            // to be moving around the only interactive window, since there's a
100            // good chance the user is interacting with it.
101            if (isShowing() && mShowingMenus.size() > 0
102                    && !mShowingMenus.get(0).window.isModal()) {
103                final View anchor = mShownAnchorView;
104                if (anchor == null || !anchor.isShown()) {
105                    dismiss();
106                } else {
107                    // Recompute window sizes and positions.
108                    for (CascadingMenuInfo info : mShowingMenus) {
109                        info.window.show();
110                    }
111                }
112            }
113        }
114    };
115
116    private final MenuItemHoverListener mMenuItemHoverListener = new MenuItemHoverListener() {
117        @Override
118        public void onItemHoverExit(@NonNull MenuBuilder menu, @NonNull MenuItem item) {
119            // If the mouse moves between two windows, hover enter/exit pairs
120            // may be received out of order. So, instead of canceling all
121            // pending runnables, only cancel runnables for the host menu.
122            mSubMenuHoverHandler.removeCallbacksAndMessages(menu);
123        }
124
125        @Override
126        public void onItemHoverEnter(
127                @NonNull final MenuBuilder menu, @NonNull final MenuItem item) {
128            // Something new was hovered, cancel all scheduled runnables.
129            mSubMenuHoverHandler.removeCallbacksAndMessages(null);
130
131            // Find the position of the hovered menu within the added menus.
132            int menuIndex = -1;
133            for (int i = 0, count = mShowingMenus.size(); i < count; i++) {
134                if (menu == mShowingMenus.get(i).menu) {
135                    menuIndex = i;
136                    break;
137                }
138            }
139
140            if (menuIndex == -1) {
141                return;
142            }
143
144            final CascadingMenuInfo nextInfo;
145            final int nextIndex = menuIndex + 1;
146            if (nextIndex < mShowingMenus.size()) {
147                nextInfo = mShowingMenus.get(nextIndex);
148            } else {
149                nextInfo = null;
150            }
151
152            final Runnable runnable = new Runnable() {
153                @Override
154                public void run() {
155                    // Close any other submenus that might be open at the
156                    // current or a deeper level.
157                    if (nextInfo != null) {
158                        // Disable exit animations to prevent overlapping
159                        // fading out submenus.
160                        mShouldCloseImmediately = true;
161                        nextInfo.menu.close(false /* closeAllMenus */);
162                        mShouldCloseImmediately = false;
163                    }
164
165                    // Then open the selected submenu, if there is one.
166                    if (item.isEnabled() && item.hasSubMenu()) {
167                        menu.performItemAction(item, 0);
168                    }
169                }
170            };
171            final long uptimeMillis = SystemClock.uptimeMillis() + SUBMENU_TIMEOUT_MS;
172            mSubMenuHoverHandler.postAtTime(runnable, menu, uptimeMillis);
173        }
174    };
175
176    private int mRawDropDownGravity = Gravity.NO_GRAVITY;
177    private int mDropDownGravity = Gravity.NO_GRAVITY;
178    private View mAnchorView;
179    private View mShownAnchorView;
180    private int mLastPosition;
181    private boolean mHasXOffset;
182    private boolean mHasYOffset;
183    private int mXOffset;
184    private int mYOffset;
185    private boolean mForceShowIcon;
186    private boolean mShowTitle;
187    private Callback mPresenterCallback;
188    private ViewTreeObserver mTreeObserver;
189    private PopupWindow.OnDismissListener mOnDismissListener;
190
191    /** Whether popup menus should disable exit animations when closing. */
192    private boolean mShouldCloseImmediately;
193
194    /**
195     * Initializes a new cascading-capable menu popup.
196     *
197     * @param anchor A parent view to get the {@link android.view.View#getWindowToken()} token from.
198     */
199    public CascadingMenuPopup(@NonNull Context context, @NonNull View anchor,
200            @AttrRes int popupStyleAttr, @StyleRes int popupStyleRes, boolean overflowOnly) {
201        mContext = context;
202        mAnchorView = anchor;
203        mPopupStyleAttr = popupStyleAttr;
204        mPopupStyleRes = popupStyleRes;
205        mOverflowOnly = overflowOnly;
206
207        mForceShowIcon = false;
208        mLastPosition = getInitialMenuPosition();
209
210        final Resources res = context.getResources();
211        mMenuMaxWidth = Math.max(res.getDisplayMetrics().widthPixels / 2,
212                res.getDimensionPixelSize(R.dimen.abc_config_prefDialogWidth));
213
214        mSubMenuHoverHandler = new Handler();
215    }
216
217    @Override
218    public void setForceShowIcon(boolean forceShow) {
219        mForceShowIcon = forceShow;
220    }
221
222    private MenuPopupWindow createPopupWindow() {
223        MenuPopupWindow popupWindow = new MenuPopupWindow(
224                mContext, null, mPopupStyleAttr, mPopupStyleRes);
225        popupWindow.setHoverListener(mMenuItemHoverListener);
226        popupWindow.setOnItemClickListener(this);
227        popupWindow.setOnDismissListener(this);
228        popupWindow.setAnchorView(mAnchorView);
229        popupWindow.setDropDownGravity(mDropDownGravity);
230        popupWindow.setModal(true);
231        return popupWindow;
232    }
233
234    @Override
235    public void show() {
236        if (isShowing()) {
237            return;
238        }
239
240        // Display all pending menus.
241        for (MenuBuilder menu : mPendingMenus) {
242            showMenu(menu);
243        }
244        mPendingMenus.clear();
245
246        mShownAnchorView = mAnchorView;
247
248        if (mShownAnchorView != null) {
249            final boolean addGlobalListener = mTreeObserver == null;
250            mTreeObserver = mShownAnchorView.getViewTreeObserver(); // Refresh to latest
251            if (addGlobalListener) {
252                mTreeObserver.addOnGlobalLayoutListener(mGlobalLayoutListener);
253            }
254        }
255    }
256
257    @Override
258    public void dismiss() {
259        // Need to make another list to avoid a concurrent modification
260        // exception, as #onDismiss may clear mPopupWindows while we are
261        // iterating. Remove from the last added menu so that the callbacks
262        // are received in order from foreground to background.
263        final int length = mShowingMenus.size();
264        if (length > 0) {
265            final CascadingMenuInfo[] addedMenus =
266                    mShowingMenus.toArray(new CascadingMenuInfo[length]);
267            for (int i = length - 1; i >= 0; i--) {
268                final CascadingMenuInfo info = addedMenus[i];
269                if (info.window.isShowing()) {
270                    info.window.dismiss();
271                }
272            }
273        }
274    }
275
276    @Override
277    public boolean onKey(View v, int keyCode, KeyEvent event) {
278        if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_MENU) {
279            dismiss();
280            return true;
281        }
282        return false;
283    }
284
285    /**
286     * Determines the proper initial menu position for the current LTR/RTL configuration.
287     * @return The initial position.
288     */
289    @HorizPosition
290    private int getInitialMenuPosition() {
291        final int layoutDirection = ViewCompat.getLayoutDirection(mAnchorView);
292        return layoutDirection == ViewCompat.LAYOUT_DIRECTION_RTL ? HORIZ_POSITION_LEFT :
293                HORIZ_POSITION_RIGHT;
294    }
295
296    /**
297     * Determines whether the next submenu (of the given width) should display on the right or on
298     * the left of the most recent menu.
299     *
300     * @param nextMenuWidth Width of the next submenu to display.
301     * @return The position to display it.
302     */
303    @HorizPosition
304    private int getNextMenuPosition(int nextMenuWidth) {
305        ListView lastListView = mShowingMenus.get(mShowingMenus.size() - 1).getListView();
306
307        final int[] screenLocation = new int[2];
308        lastListView.getLocationOnScreen(screenLocation);
309
310        final Rect displayFrame = new Rect();
311        mShownAnchorView.getWindowVisibleDisplayFrame(displayFrame);
312
313        if (mLastPosition == HORIZ_POSITION_RIGHT) {
314            final int right = screenLocation[0] + lastListView.getWidth() + nextMenuWidth;
315            if (right > displayFrame.right) {
316                return HORIZ_POSITION_LEFT;
317            }
318            return HORIZ_POSITION_RIGHT;
319        } else { // LEFT
320            final int left = screenLocation[0] - nextMenuWidth;
321            if (left < 0) {
322                return HORIZ_POSITION_RIGHT;
323            }
324            return HORIZ_POSITION_LEFT;
325        }
326    }
327
328    @Override
329    public void addMenu(MenuBuilder menu) {
330        menu.addMenuPresenter(this, mContext);
331
332        if (isShowing()) {
333            showMenu(menu);
334        } else {
335            mPendingMenus.add(menu);
336        }
337    }
338
339    /**
340     * Prepares and shows the specified menu immediately.
341     *
342     * @param menu the menu to show
343     */
344    private void showMenu(@NonNull MenuBuilder menu) {
345        final LayoutInflater inflater = LayoutInflater.from(mContext);
346        final MenuAdapter adapter = new MenuAdapter(menu, inflater, mOverflowOnly);
347
348        // Apply "force show icon" setting. There are 3 cases:
349        // (1) This is the top level menu and icon spacing is forced. Add spacing.
350        // (2) This is a submenu. Add spacing if any of the visible menu items has an icon.
351        // (3) This is the top level menu and icon spacing isn't forced. Do not add spacing.
352        if (!isShowing() && mForceShowIcon) {
353          // Case 1
354          adapter.setForceShowIcon(true);
355        } else if (isShowing()) {
356          // Case 2
357          adapter.setForceShowIcon(MenuPopup.shouldPreserveIconSpacing(menu));
358        }
359        // Case 3: Else, don't allow spacing for icons (default behavior; do nothing).
360
361        final int menuWidth = measureIndividualMenuWidth(adapter, null, mContext, mMenuMaxWidth);
362        final MenuPopupWindow popupWindow = createPopupWindow();
363        popupWindow.setAdapter(adapter);
364        popupWindow.setWidth(menuWidth);
365        popupWindow.setDropDownGravity(mDropDownGravity);
366
367        final CascadingMenuInfo parentInfo;
368        final View parentView;
369        if (mShowingMenus.size() > 0) {
370            parentInfo = mShowingMenus.get(mShowingMenus.size() - 1);
371            parentView = findParentViewForSubmenu(parentInfo, menu);
372        } else {
373            parentInfo = null;
374            parentView = null;
375        }
376
377        if (parentView != null) {
378            // This menu is a cascading submenu anchored to a parent view.
379            popupWindow.setTouchModal(false);
380            popupWindow.setEnterTransition(null);
381
382            final @HorizPosition int nextMenuPosition = getNextMenuPosition(menuWidth);
383            final boolean showOnRight = nextMenuPosition == HORIZ_POSITION_RIGHT;
384            mLastPosition = nextMenuPosition;
385
386            final int[] tempLocation = new int[2];
387
388            // This popup menu will be positioned relative to the top-left edge
389            // of the view representing its parent menu.
390            parentView.getLocationInWindow(tempLocation);
391            final int parentOffsetLeft = parentInfo.window.getHorizontalOffset() + tempLocation[0];
392            final int parentOffsetTop = parentInfo.window.getVerticalOffset() + tempLocation[1];
393
394            // By now, mDropDownGravity is the resolved absolute gravity, so
395            // this should work in both LTR and RTL.
396            final int x;
397            if ((mDropDownGravity & Gravity.RIGHT) == Gravity.RIGHT) {
398                if (showOnRight) {
399                    x = parentOffsetLeft + menuWidth;
400                } else {
401                    x = parentOffsetLeft - parentView.getWidth();
402                }
403            } else {
404                if (showOnRight) {
405                    x = parentOffsetLeft + parentView.getWidth();
406                } else {
407                    x = parentOffsetLeft - menuWidth;
408                }
409            }
410
411            popupWindow.setHorizontalOffset(x);
412
413            final int y = parentOffsetTop;
414            popupWindow.setVerticalOffset(y);
415        } else {
416            if (mHasXOffset) {
417                popupWindow.setHorizontalOffset(mXOffset);
418            }
419            if (mHasYOffset) {
420                popupWindow.setVerticalOffset(mYOffset);
421            }
422            final Rect epicenterBounds = getEpicenterBounds();
423            popupWindow.setEpicenterBounds(epicenterBounds);
424        }
425
426        final CascadingMenuInfo menuInfo = new CascadingMenuInfo(popupWindow, menu, mLastPosition);
427        mShowingMenus.add(menuInfo);
428
429        popupWindow.show();
430
431        // If this is the root menu, show the title if requested.
432        if (parentInfo == null && mShowTitle && menu.getHeaderTitle() != null) {
433            final ListView listView = popupWindow.getListView();
434            final FrameLayout titleItemView = (FrameLayout) inflater.inflate(
435                    R.layout.abc_popup_menu_header_item_layout, listView, false);
436            final TextView titleView = (TextView) titleItemView.findViewById(android.R.id.title);
437            titleItemView.setEnabled(false);
438            titleView.setText(menu.getHeaderTitle());
439            listView.addHeaderView(titleItemView, null, false);
440
441            // Show again to update the title.
442            popupWindow.show();
443        }
444    }
445
446    /**
447     * Returns the menu item within the specified parent menu that owns
448     * specified submenu.
449     *
450     * @param parent the parent menu
451     * @param submenu the submenu for which the index should be returned
452     * @return the menu item that owns the submenu, or {@code null} if not
453     *         present
454     */
455    private MenuItem findMenuItemForSubmenu(
456            @NonNull MenuBuilder parent, @NonNull MenuBuilder submenu) {
457        for (int i = 0, count = parent.size(); i < count; i++) {
458            final MenuItem item = parent.getItem(i);
459            if (item.hasSubMenu() && submenu == item.getSubMenu()) {
460                return item;
461            }
462        }
463
464        return null;
465    }
466
467    /**
468     * Attempts to find the view for the menu item that owns the specified
469     * submenu.
470     *
471     * @param parentInfo info for the parent menu
472     * @param submenu the submenu whose parent view should be obtained
473     * @return the parent view, or {@code null} if one could not be found
474     */
475    @Nullable
476    private View findParentViewForSubmenu(
477            @NonNull CascadingMenuInfo parentInfo, @NonNull MenuBuilder submenu) {
478        final MenuItem owner = findMenuItemForSubmenu(parentInfo.menu, submenu);
479        if (owner == null) {
480            // Couldn't find the submenu owner.
481            return null;
482        }
483
484        // The adapter may be wrapped. Adjust the index if necessary.
485        final int headersCount;
486        final MenuAdapter menuAdapter;
487        final ListView listView = parentInfo.getListView();
488        final ListAdapter listAdapter = listView.getAdapter();
489        if (listAdapter instanceof HeaderViewListAdapter) {
490            final HeaderViewListAdapter headerAdapter = (HeaderViewListAdapter) listAdapter;
491            headersCount = headerAdapter.getHeadersCount();
492            menuAdapter = (MenuAdapter) headerAdapter.getWrappedAdapter();
493        } else {
494            headersCount = 0;
495            menuAdapter = (MenuAdapter) listAdapter;
496        }
497
498        // Find the index within the menu adapter's data set of the menu item.
499        int ownerPosition = AbsListView.INVALID_POSITION;
500        for (int i = 0, count = menuAdapter.getCount(); i < count; i++) {
501            if (owner == menuAdapter.getItem(i)) {
502                ownerPosition = i;
503                break;
504            }
505        }
506        if (ownerPosition == AbsListView.INVALID_POSITION) {
507            // Couldn't find the owner within the menu adapter.
508            return null;
509        }
510
511        // Adjust the index for the adapter used to display views.
512        ownerPosition += headersCount;
513
514        // Adjust the index for the visible views.
515        final int ownerViewPosition = ownerPosition - listView.getFirstVisiblePosition();
516        if (ownerViewPosition < 0 || ownerViewPosition >= listView.getChildCount()) {
517            // Not visible on screen.
518            return null;
519        }
520
521        return listView.getChildAt(ownerViewPosition);
522    }
523
524    /**
525     * @return {@code true} if the popup is currently showing, {@code false} otherwise.
526     */
527    @Override
528    public boolean isShowing() {
529        return mShowingMenus.size() > 0 && mShowingMenus.get(0).window.isShowing();
530    }
531
532    /**
533     * Called when one or more of the popup windows was dismissed.
534     */
535    @Override
536    public void onDismiss() {
537        // The dismiss listener doesn't pass the calling window, so walk
538        // through the stack to figure out which one was just dismissed.
539        CascadingMenuInfo dismissedInfo = null;
540        for (int i = 0, count = mShowingMenus.size(); i < count; i++) {
541            final CascadingMenuInfo info = mShowingMenus.get(i);
542            if (!info.window.isShowing()) {
543                dismissedInfo = info;
544                break;
545            }
546        }
547
548        // Close all menus starting from the dismissed menu, passing false
549        // since we are manually closing only a subset of windows.
550        if (dismissedInfo != null) {
551            dismissedInfo.menu.close(false);
552        }
553    }
554
555    @Override
556    public void updateMenuView(boolean cleared) {
557        for (CascadingMenuInfo info : mShowingMenus) {
558            toMenuAdapter(info.getListView().getAdapter()).notifyDataSetChanged();
559        }
560    }
561
562    @Override
563    public void setCallback(Callback cb) {
564        mPresenterCallback = cb;
565    }
566
567    @Override
568    public boolean onSubMenuSelected(SubMenuBuilder subMenu) {
569        // Don't allow double-opening of the same submenu.
570        for (CascadingMenuInfo info : mShowingMenus) {
571            if (subMenu == info.menu) {
572                // Just re-focus that one.
573                info.getListView().requestFocus();
574                return true;
575            }
576        }
577
578        if (subMenu.hasVisibleItems()) {
579            addMenu(subMenu);
580
581            if (mPresenterCallback != null) {
582                mPresenterCallback.onOpenSubMenu(subMenu);
583            }
584            return true;
585        }
586        return false;
587    }
588
589    /**
590     * Finds the index of the specified menu within the list of added menus.
591     *
592     * @param menu the menu to find
593     * @return the index of the menu, or {@code -1} if not present
594     */
595    private int findIndexOfAddedMenu(@NonNull MenuBuilder menu) {
596        for (int i = 0, count = mShowingMenus.size(); i < count; i++) {
597            final CascadingMenuInfo info  = mShowingMenus.get(i);
598            if (menu == info.menu) {
599                return i;
600            }
601        }
602
603        return -1;
604    }
605
606    @Override
607    public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) {
608        final int menuIndex = findIndexOfAddedMenu(menu);
609        if (menuIndex < 0) {
610            return;
611        }
612
613        // Recursively close descendant menus.
614        final int nextMenuIndex = menuIndex + 1;
615        if (nextMenuIndex < mShowingMenus.size()) {
616            final CascadingMenuInfo childInfo = mShowingMenus.get(nextMenuIndex);
617            childInfo.menu.close(false /* closeAllMenus */);
618        }
619
620        // Close the target menu.
621        final CascadingMenuInfo info = mShowingMenus.remove(menuIndex);
622        info.menu.removeMenuPresenter(this);
623        if (mShouldCloseImmediately) {
624            // Disable all exit animations.
625            info.window.setExitTransition(null);
626            info.window.setAnimationStyle(0);
627        }
628        info.window.dismiss();
629
630        final int count = mShowingMenus.size();
631        if (count > 0) {
632            mLastPosition = mShowingMenus.get(count - 1).position;
633        } else {
634            mLastPosition = getInitialMenuPosition();
635        }
636
637        if (count == 0) {
638            // This was the last window. Clean up.
639            dismiss();
640
641            if (mPresenterCallback != null) {
642                mPresenterCallback.onCloseMenu(menu, true);
643            }
644
645            if (mTreeObserver != null) {
646                if (mTreeObserver.isAlive()) {
647                    mTreeObserver.removeGlobalOnLayoutListener(mGlobalLayoutListener);
648                }
649                mTreeObserver = null;
650            }
651
652
653            // If every [sub]menu was dismissed, that means the whole thing was
654            // dismissed, so notify the owner.
655            mOnDismissListener.onDismiss();
656        } else if (allMenusAreClosing) {
657            // Close all menus starting from the root. This will recursively
658            // close any remaining menus, so we don't need to propagate the
659            // "closeAllMenus" flag. The last window will clean up.
660            final CascadingMenuInfo rootInfo = mShowingMenus.get(0);
661            rootInfo.menu.close(false /* closeAllMenus */);
662        }
663    }
664
665    @Override
666    public boolean flagActionItems() {
667        return false;
668    }
669
670    @Override
671    public Parcelable onSaveInstanceState() {
672        return null;
673    }
674
675    @Override
676    public void onRestoreInstanceState(Parcelable state) {
677    }
678
679    @Override
680    public void setGravity(int dropDownGravity) {
681        if (mRawDropDownGravity != dropDownGravity) {
682            mRawDropDownGravity = dropDownGravity;
683            mDropDownGravity = GravityCompat.getAbsoluteGravity(
684                    dropDownGravity, ViewCompat.getLayoutDirection(mAnchorView));
685        }
686    }
687
688    @Override
689    public void setAnchorView(@NonNull View anchor) {
690        if (mAnchorView != anchor) {
691            mAnchorView = anchor;
692
693            // Gravity resolution may have changed, update from raw gravity.
694            mDropDownGravity = GravityCompat.getAbsoluteGravity(
695                    mRawDropDownGravity, ViewCompat.getLayoutDirection(mAnchorView));
696        }
697    }
698
699    @Override
700    public void setOnDismissListener(OnDismissListener listener) {
701        mOnDismissListener = listener;
702    }
703
704    @Override
705    public ListView getListView() {
706        return mShowingMenus.isEmpty()
707                ? null
708                : mShowingMenus.get(mShowingMenus.size() - 1).getListView();
709    }
710
711    @Override
712    public void setHorizontalOffset(int x) {
713        mHasXOffset = true;
714        mXOffset = x;
715    }
716
717    @Override
718    public void setVerticalOffset(int y) {
719        mHasYOffset = true;
720        mYOffset = y;
721    }
722
723    @Override
724    public void setShowTitle(boolean showTitle) {
725        mShowTitle = showTitle;
726    }
727
728    private static class CascadingMenuInfo {
729        public final MenuPopupWindow window;
730        public final MenuBuilder menu;
731        public final int position;
732
733        public CascadingMenuInfo(@NonNull MenuPopupWindow window, @NonNull MenuBuilder menu,
734                int position) {
735            this.window = window;
736            this.menu = menu;
737            this.position = position;
738        }
739
740        public ListView getListView() {
741            return window.getListView();
742        }
743    }
744}