Folder.java revision 715a322e9ad62b4f0fc0ddca17c98a0ed6d048de 
1/*
2 * Copyright (C) 2008 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 com.android.launcher3.folder;
18
19import android.animation.Animator;
20import android.animation.AnimatorListenerAdapter;
21import android.animation.AnimatorSet;
22import android.animation.ObjectAnimator;
23import android.animation.PropertyValuesHolder;
24import android.annotation.SuppressLint;
25import android.content.Context;
26import android.content.res.Resources;
27import android.graphics.Rect;
28import android.text.InputType;
29import android.text.Selection;
30import android.util.AttributeSet;
31import android.util.Log;
32import android.view.ActionMode;
33import android.view.FocusFinder;
34import android.view.KeyEvent;
35import android.view.Menu;
36import android.view.MenuItem;
37import android.view.MotionEvent;
38import android.view.View;
39import android.view.ViewDebug;
40import android.view.accessibility.AccessibilityEvent;
41import android.view.animation.AccelerateInterpolator;
42import android.view.animation.AnimationUtils;
43import android.view.inputmethod.EditorInfo;
44import android.widget.TextView;
45
46import com.android.launcher3.AbstractFloatingView;
47import com.android.launcher3.Alarm;
48import com.android.launcher3.AppInfo;
49import com.android.launcher3.CellLayout;
50import com.android.launcher3.DeviceProfile;
51import com.android.launcher3.DragSource;
52import com.android.launcher3.DropTarget;
53import com.android.launcher3.ExtendedEditText;
54import com.android.launcher3.FolderInfo;
55import com.android.launcher3.FolderInfo.FolderListener;
56import com.android.launcher3.ItemInfo;
57import com.android.launcher3.Launcher;
58import com.android.launcher3.LauncherAnimUtils;
59import com.android.launcher3.LauncherSettings;
60import com.android.launcher3.LogDecelerateInterpolator;
61import com.android.launcher3.OnAlarmListener;
62import com.android.launcher3.PagedView;
63import com.android.launcher3.R;
64import com.android.launcher3.ShortcutInfo;
65import com.android.launcher3.UninstallDropTarget.DropTargetSource;
66import com.android.launcher3.Utilities;
67import com.android.launcher3.Workspace.ItemOperator;
68import com.android.launcher3.accessibility.AccessibleDragListenerAdapter;
69import com.android.launcher3.config.FeatureFlags;
70import com.android.launcher3.config.ProviderConfig;
71import com.android.launcher3.dragndrop.DragController;
72import com.android.launcher3.dragndrop.DragController.DragListener;
73import com.android.launcher3.dragndrop.DragLayer;
74import com.android.launcher3.dragndrop.DragOptions;
75import com.android.launcher3.pageindicators.PageIndicatorDots;
76import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
77import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
78import com.android.launcher3.util.CircleRevealOutlineProvider;
79import com.android.launcher3.util.Thunk;
80
81import java.util.ArrayList;
82import java.util.Collections;
83import java.util.Comparator;
84
85/**
86 * Represents a set of icons chosen by the user or generated by the system.
87 */
88public class Folder extends AbstractFloatingView implements DragSource, View.OnClickListener,
89        View.OnLongClickListener, DropTarget, FolderListener, TextView.OnEditorActionListener,
90        View.OnFocusChangeListener, DragListener, DropTargetSource,
91        ExtendedEditText.OnBackKeyListener {
92    private static final String TAG = "Launcher.Folder";
93
94    /**
95     * We avoid measuring {@link #mContent} with a 0 width or height, as this
96     * results in CellLayout being measured as UNSPECIFIED, which it does not support.
97     */
98    private static final int MIN_CONTENT_DIMEN = 5;
99
100    static final int STATE_NONE = -1;
101    static final int STATE_SMALL = 0;
102    static final int STATE_ANIMATING = 1;
103    static final int STATE_OPEN = 2;
104
105    /**
106     * Time for which the scroll hint is shown before automatically changing page.
107     */
108    public static final int SCROLL_HINT_DURATION = 500;
109    public static final int RESCROLL_DELAY = PagedView.PAGE_SNAP_ANIMATION_DURATION + 150;
110
111    public static final int SCROLL_NONE = -1;
112    public static final int SCROLL_LEFT = 0;
113    public static final int SCROLL_RIGHT = 1;
114
115    /**
116     * Fraction of icon width which behave as scroll region.
117     */
118    private static final float ICON_OVERSCROLL_WIDTH_FACTOR = 0.45f;
119
120    private static final int FOLDER_NAME_ANIMATION_DURATION = 633;
121
122    private static final int REORDER_DELAY = 250;
123    private static final int ON_EXIT_CLOSE_DELAY = 400;
124    private static final Rect sTempRect = new Rect();
125
126    private static String sDefaultFolderName;
127    private static String sHintText;
128
129    private final Alarm mReorderAlarm = new Alarm();
130    private final Alarm mOnExitAlarm = new Alarm();
131    private final Alarm mOnScrollHintAlarm = new Alarm();
132    @Thunk final Alarm mScrollPauseAlarm = new Alarm();
133
134    @Thunk final ArrayList<View> mItemsInReadingOrder = new ArrayList<View>();
135
136    private final int mExpandDuration;
137    private final int mMaterialExpandDuration;
138    private final int mMaterialExpandStagger;
139
140    protected final Launcher mLauncher;
141    protected DragController mDragController;
142    public FolderInfo mInfo;
143
144    @Thunk FolderIcon mFolderIcon;
145
146    @Thunk FolderPagedView mContent;
147    public ExtendedEditText mFolderName;
148    private PageIndicatorDots mPageIndicator;
149
150    private View mFooter;
151    private int mFooterHeight;
152
153    // Cell ranks used for drag and drop
154    @Thunk int mTargetRank, mPrevTargetRank, mEmptyCellRank;
155
156    @ViewDebug.ExportedProperty(category = "launcher",
157            mapping = {
158                    @ViewDebug.IntToString(from = STATE_NONE, to = "STATE_NONE"),
159                    @ViewDebug.IntToString(from = STATE_SMALL, to = "STATE_SMALL"),
160                    @ViewDebug.IntToString(from = STATE_ANIMATING, to = "STATE_ANIMATING"),
161                    @ViewDebug.IntToString(from = STATE_OPEN, to = "STATE_OPEN"),
162            })
163    @Thunk int mState = STATE_NONE;
164    @ViewDebug.ExportedProperty(category = "launcher")
165    private boolean mRearrangeOnClose = false;
166    boolean mItemsInvalidated = false;
167    private View mCurrentDragView;
168    private boolean mIsExternalDrag;
169    private boolean mDragInProgress = false;
170    private boolean mDeleteFolderOnDropCompleted = false;
171    private boolean mSuppressFolderDeletion = false;
172    private boolean mItemAddedBackToSelfViaIcon = false;
173    @Thunk float mFolderIconPivotX;
174    @Thunk float mFolderIconPivotY;
175    private boolean mIsEditingName = false;
176
177    @ViewDebug.ExportedProperty(category = "launcher")
178    private boolean mDestroyed;
179
180    @Thunk Runnable mDeferredAction;
181    private boolean mDeferDropAfterUninstall;
182    private boolean mUninstallSuccessful;
183
184    // Folder scrolling
185    private int mScrollAreaOffset;
186
187    @Thunk int mScrollHintDir = SCROLL_NONE;
188    @Thunk int mCurrentScrollDir = SCROLL_NONE;
189
190    /**
191     * Used to inflate the Workspace from XML.
192     *
193     * @param context The application's context.
194     * @param attrs The attributes set containing the Workspace's customization values.
195     */
196    public Folder(Context context, AttributeSet attrs) {
197        super(context, attrs);
198        setAlwaysDrawnWithCacheEnabled(false);
199        Resources res = getResources();
200        mExpandDuration = res.getInteger(R.integer.config_folderExpandDuration);
201        mMaterialExpandDuration = res.getInteger(R.integer.config_materialFolderExpandDuration);
202        mMaterialExpandStagger = res.getInteger(R.integer.config_materialFolderExpandStagger);
203
204        if (sDefaultFolderName == null) {
205            sDefaultFolderName = res.getString(R.string.folder_name);
206        }
207        if (sHintText == null) {
208            sHintText = res.getString(R.string.folder_hint_text);
209        }
210        mLauncher = Launcher.getLauncher(context);
211        // We need this view to be focusable in touch mode so that when text editing of the folder
212        // name is complete, we have something to focus on, thus hiding the cursor and giving
213        // reliable behavior when clicking the text field (since it will always gain focus on click).
214        setFocusableInTouchMode(true);
215    }
216
217    @Override
218    protected void onFinishInflate() {
219        super.onFinishInflate();
220        mContent = (FolderPagedView) findViewById(R.id.folder_content);
221        mContent.setFolder(this);
222
223        mPageIndicator = (PageIndicatorDots) findViewById(R.id.folder_page_indicator);
224        mFolderName = (ExtendedEditText) findViewById(R.id.folder_name);
225        mFolderName.setOnBackKeyListener(this);
226        mFolderName.setOnFocusChangeListener(this);
227
228        if (!Utilities.ATLEAST_MARSHMALLOW) {
229            // We disable action mode in older OSes where floating selection menu is not yet
230            // available.
231            mFolderName.setCustomSelectionActionModeCallback(new ActionMode.Callback() {
232                public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
233                    return false;
234                }
235
236                public boolean onCreateActionMode(ActionMode mode, Menu menu) {
237                    return false;
238                }
239
240                public void onDestroyActionMode(ActionMode mode) {
241                }
242
243                public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
244                    return false;
245                }
246            });
247        }
248        mFolderName.setOnEditorActionListener(this);
249        mFolderName.setSelectAllOnFocus(true);
250        mFolderName.setInputType(mFolderName.getInputType()
251                & ~InputType.TYPE_TEXT_FLAG_AUTO_CORRECT
252                & ~InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS
253                | InputType.TYPE_TEXT_FLAG_CAP_WORDS);
254        mFolderName.forceDisableSuggestions(true);
255
256        mFooter = findViewById(R.id.folder_footer);
257
258        // We find out how tall footer wants to be (it is set to wrap_content), so that
259        // we can allocate the appropriate amount of space for it.
260        int measureSpec = MeasureSpec.UNSPECIFIED;
261        mFooter.measure(measureSpec, measureSpec);
262        mFooterHeight = mFooter.getMeasuredHeight();
263    }
264
265    public void onClick(View v) {
266        Object tag = v.getTag();
267        if (tag instanceof ShortcutInfo) {
268            mLauncher.onClick(v);
269        }
270    }
271
272    public boolean onLongClick(View v) {
273        // Return if global dragging is not enabled
274        if (!mLauncher.isDraggingEnabled()) return true;
275        return startDrag(v, new DragOptions());
276    }
277
278    public boolean startDrag(View v, DragOptions options) {
279        Object tag = v.getTag();
280        if (tag instanceof ShortcutInfo) {
281            ShortcutInfo item = (ShortcutInfo) tag;
282            if (!v.isInTouchMode()) {
283                return false;
284            }
285
286            mEmptyCellRank = item.rank;
287            mCurrentDragView = v;
288
289            mDragController.addDragListener(this);
290            if (options.isAccessibleDrag) {
291                mDragController.addDragListener(new AccessibleDragListenerAdapter(
292                        mContent, CellLayout.FOLDER_ACCESSIBILITY_DRAG) {
293
294                    @Override
295                    protected void enableAccessibleDrag(boolean enable) {
296                        super.enableAccessibleDrag(enable);
297                        mFooter.setImportantForAccessibility(enable
298                                ? IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS
299                                : IMPORTANT_FOR_ACCESSIBILITY_AUTO);
300                    }
301                });
302            }
303
304            mLauncher.getWorkspace().beginDragShared(v, this, options);
305        }
306        return true;
307    }
308
309    @Override
310    public void onDragStart(DropTarget.DragObject dragObject, DragOptions options) {
311        if (dragObject.dragSource != this) {
312            return;
313        }
314
315        mContent.removeItem(mCurrentDragView);
316        if (dragObject.dragInfo instanceof ShortcutInfo) {
317            mItemsInvalidated = true;
318
319            // We do not want to get events for the item being removed, as they will get handled
320            // when the drop completes
321            try (SuppressInfoChanges s = new SuppressInfoChanges()) {
322                mInfo.remove((ShortcutInfo) dragObject.dragInfo, true);
323            }
324        }
325        mDragInProgress = true;
326        mItemAddedBackToSelfViaIcon = false;
327    }
328
329    @Override
330    public void onDragEnd() {
331        if (mIsExternalDrag && mDragInProgress) {
332            completeDragExit();
333        }
334        mDragController.removeDragListener(this);
335    }
336
337    public boolean isEditingName() {
338        return mIsEditingName;
339    }
340
341    public void startEditingFolderName() {
342        post(new Runnable() {
343            @Override
344            public void run() {
345                mFolderName.setHint("");
346                mIsEditingName = true;
347            }
348        });
349    }
350
351
352    @Override
353    public boolean onBackKey() {
354        mFolderName.setHint(sHintText);
355        // Convert to a string here to ensure that no other state associated with the text field
356        // gets saved.
357        String newTitle = mFolderName.getText().toString();
358        mInfo.setTitle(newTitle);
359        mLauncher.getModelWriter().updateItemInDatabase(mInfo);
360
361        Utilities.sendCustomAccessibilityEvent(
362                this, AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED,
363                getContext().getString(R.string.folder_renamed, newTitle));
364
365        // This ensures that focus is gained every time the field is clicked, which selects all
366        // the text and brings up the soft keyboard if necessary.
367        mFolderName.clearFocus();
368
369        Selection.setSelection(mFolderName.getText(), 0, 0);
370        mIsEditingName = false;
371        return true;
372    }
373
374    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
375        if (actionId == EditorInfo.IME_ACTION_DONE) {
376            mFolderName.dispatchBackKey();
377            return true;
378        }
379        return false;
380    }
381
382    @Override
383    public ExtendedEditText getActiveTextView() {
384        return isEditingName() ? mFolderName : null;
385    }
386
387    public FolderIcon getFolderIcon() {
388        return mFolderIcon;
389    }
390
391    /**
392     * We need to handle touch events to prevent them from falling through to the workspace below.
393     */
394    @SuppressLint("ClickableViewAccessibility")
395    @Override
396    public boolean onTouchEvent(MotionEvent ev) {
397        return true;
398    }
399
400    public void setDragController(DragController dragController) {
401        mDragController = dragController;
402    }
403
404    public void setFolderIcon(FolderIcon icon) {
405        mFolderIcon = icon;
406    }
407
408    @Override
409    protected void onAttachedToWindow() {
410        // requestFocus() causes the focus onto the folder itself, which doesn't cause visual
411        // effect but the next arrow key can start the keyboard focus inside of the folder, not
412        // the folder itself.
413        requestFocus();
414        super.onAttachedToWindow();
415    }
416
417    @Override
418    public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
419        // When the folder gets focus, we don't want to announce the list of items.
420        return true;
421    }
422
423    @Override
424    public View focusSearch(int direction) {
425        // When the folder is focused, further focus search should be within the folder contents.
426        return FocusFinder.getInstance().findNextFocus(this, null, direction);
427    }
428
429    /**
430     * @return the FolderInfo object associated with this folder
431     */
432    public FolderInfo getInfo() {
433        return mInfo;
434    }
435
436    void bind(FolderInfo info) {
437        mInfo = info;
438        ArrayList<ShortcutInfo> children = info.contents;
439        Collections.sort(children, ITEM_POS_COMPARATOR);
440
441        ArrayList<ShortcutInfo> overflow = mContent.bindItems(children);
442
443        // If our folder has too many items we prune them from the list. This is an issue
444        // when upgrading from the old Folders implementation which could contain an unlimited
445        // number of items.
446        // TODO: Remove this, as with multi-page folders, there will never be any overflow
447        for (ShortcutInfo item: overflow) {
448            mInfo.remove(item, false);
449            mLauncher.getModelWriter().deleteItemFromDatabase(item);
450        }
451
452        DragLayer.LayoutParams lp = (DragLayer.LayoutParams) getLayoutParams();
453        if (lp == null) {
454            lp = new DragLayer.LayoutParams(0, 0);
455            lp.customPosition = true;
456            setLayoutParams(lp);
457        }
458        centerAboutIcon();
459
460        mItemsInvalidated = true;
461        updateTextViewFocus();
462        mInfo.addListener(this);
463
464        if (!sDefaultFolderName.contentEquals(mInfo.title)) {
465            mFolderName.setText(mInfo.title);
466        } else {
467            mFolderName.setText("");
468        }
469
470        // In case any children didn't come across during loading, clean up the folder accordingly
471        mFolderIcon.post(new Runnable() {
472            public void run() {
473                if (getItemCount() <= 1) {
474                    replaceFolderWithFinalItem();
475                }
476            }
477        });
478    }
479
480    /**
481     * Creates a new UserFolder, inflated from R.layout.user_folder.
482     *
483     * @param launcher The main activity.
484     *
485     * @return A new UserFolder.
486     */
487    @SuppressLint("InflateParams")
488    static Folder fromXml(Launcher launcher) {
489        return (Folder) launcher.getLayoutInflater().inflate(
490                FeatureFlags.LAUNCHER3_DISABLE_ICON_NORMALIZATION
491                        ? R.layout.user_folder : R.layout.user_folder_icon_normalized, null);
492    }
493
494    /**
495     * This method is intended to make the UserFolder to be visually identical in size and position
496     * to its associated FolderIcon. This allows for a seamless transition into the expanded state.
497     */
498    private void positionAndSizeAsIcon() {
499        if (!(getParent() instanceof DragLayer)) return;
500        setScaleX(0.8f);
501        setScaleY(0.8f);
502        setAlpha(0f);
503        mState = STATE_SMALL;
504    }
505
506    private void prepareReveal() {
507        setScaleX(1f);
508        setScaleY(1f);
509        setAlpha(1f);
510        mState = STATE_SMALL;
511    }
512
513    /**
514     * Opens the user folder described by the specified tag. The opening of the folder
515     * is animated relative to the specified View. If the View is null, no animation
516     * is played.
517     */
518    public void animateOpen() {
519        Folder openFolder = getOpen(mLauncher);
520        if (openFolder != null && openFolder != this) {
521            // Close any open folder before opening a folder.
522            openFolder.close(true);
523        }
524
525        DragLayer dragLayer = mLauncher.getDragLayer();
526        // Just verify that the folder hasn't already been added to the DragLayer.
527        // There was a one-off crash where the folder had a parent already.
528        if (getParent() == null) {
529            dragLayer.addView(this);
530            mDragController.addDropTarget(this);
531        } else {
532            if (ProviderConfig.IS_DOGFOOD_BUILD) {
533                Log.e(TAG, "Opening folder (" + this + ") which already has a parent:"
534                        + getParent());
535            }
536        }
537
538        mIsOpen = true;
539
540        mContent.completePendingPageChanges();
541        if (!mDragInProgress) {
542            // Open on the first page.
543            mContent.snapToPageImmediately(0);
544        }
545
546        // This is set to true in close(), but isn't reset to false until onDropCompleted(). This
547        // leads to an inconsistent state if you drag out of the folder and drag back in without
548        // dropping. One resulting issue is that replaceFolderWithFinalItem() can be called twice.
549        mDeleteFolderOnDropCompleted = false;
550
551        final Runnable onCompleteRunnable;
552        prepareReveal();
553        centerAboutIcon();
554
555        mFolderIcon.growAndFadeOut();
556
557        AnimatorSet anim = LauncherAnimUtils.createAnimatorSet();
558        int width = getFolderWidth();
559        int height = getFolderHeight();
560
561        float transX = - 0.075f * (width / 2 - getPivotX());
562        float transY = - 0.075f * (height / 2 - getPivotY());
563        setTranslationX(transX);
564        setTranslationY(transY);
565        PropertyValuesHolder tx = PropertyValuesHolder.ofFloat(TRANSLATION_X, transX, 0);
566        PropertyValuesHolder ty = PropertyValuesHolder.ofFloat(TRANSLATION_Y, transY, 0);
567
568        Animator drift = ObjectAnimator.ofPropertyValuesHolder(this, tx, ty);
569        drift.setDuration(mMaterialExpandDuration);
570        drift.setStartDelay(mMaterialExpandStagger);
571        drift.setInterpolator(new LogDecelerateInterpolator(100, 0));
572
573        int rx = (int) Math.max(Math.max(width - getPivotX(), 0), getPivotX());
574        int ry = (int) Math.max(Math.max(height - getPivotY(), 0), getPivotY());
575        float radius = (float) Math.hypot(rx, ry);
576
577        Animator reveal = new CircleRevealOutlineProvider((int) getPivotX(),
578                (int) getPivotY(), 0, radius).createRevealAnimator(this);
579        reveal.setDuration(mMaterialExpandDuration);
580        reveal.setInterpolator(new LogDecelerateInterpolator(100, 0));
581
582        mContent.setAlpha(0f);
583        Animator iconsAlpha = ObjectAnimator.ofFloat(mContent, "alpha", 0f, 1f);
584        iconsAlpha.setDuration(mMaterialExpandDuration);
585        iconsAlpha.setStartDelay(mMaterialExpandStagger);
586        iconsAlpha.setInterpolator(new AccelerateInterpolator(1.5f));
587
588        mFooter.setAlpha(0f);
589        Animator textAlpha = ObjectAnimator.ofFloat(mFooter, "alpha", 0f, 1f);
590        textAlpha.setDuration(mMaterialExpandDuration);
591        textAlpha.setStartDelay(mMaterialExpandStagger);
592        textAlpha.setInterpolator(new AccelerateInterpolator(1.5f));
593
594        anim.play(drift);
595        anim.play(iconsAlpha);
596        anim.play(textAlpha);
597        anim.play(reveal);
598
599        mContent.setLayerType(LAYER_TYPE_HARDWARE, null);
600        mFooter.setLayerType(LAYER_TYPE_HARDWARE, null);
601        onCompleteRunnable = new Runnable() {
602            @Override
603            public void run() {
604                mContent.setLayerType(LAYER_TYPE_NONE, null);
605                mFooter.setLayerType(LAYER_TYPE_NONE, null);
606                mLauncher.getUserEventDispatcher().resetElapsedContainerMillis();
607            }
608        };
609        anim.addListener(new AnimatorListenerAdapter() {
610            @Override
611            public void onAnimationStart(Animator animation) {
612                Utilities.sendCustomAccessibilityEvent(
613                        Folder.this,
614                        AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED,
615                        mContent.getAccessibilityDescription());
616                mState = STATE_ANIMATING;
617            }
618            @Override
619            public void onAnimationEnd(Animator animation) {
620                mState = STATE_OPEN;
621
622                onCompleteRunnable.run();
623                mContent.setFocusOnFirstChild();
624
625                // Temporary fix b/36246234
626                setTranslationX(0f);
627                setTranslationY(0f);
628                mContent.setAlpha(1f);
629                mFooter.setAlpha(1f);
630            }
631        });
632
633        // Footer animation
634        if (mContent.getPageCount() > 1 && !mInfo.hasOption(FolderInfo.FLAG_MULTI_PAGE_ANIMATION)) {
635            int footerWidth = mContent.getDesiredWidth()
636                    - mFooter.getPaddingLeft() - mFooter.getPaddingRight();
637
638            float textWidth =  mFolderName.getPaint().measureText(mFolderName.getText().toString());
639            float translation = (footerWidth - textWidth) / 2;
640            mFolderName.setTranslationX(mContent.mIsRtl ? -translation : translation);
641            mPageIndicator.prepareEntryAnimation();
642
643            // Do not update the flag if we are in drag mode. The flag will be updated, when we
644            // actually drop the icon.
645            final boolean updateAnimationFlag = !mDragInProgress;
646            anim.addListener(new AnimatorListenerAdapter() {
647
648                @SuppressLint("InlinedApi")
649                @Override
650                public void onAnimationEnd(Animator animation) {
651                    mFolderName.animate().setDuration(FOLDER_NAME_ANIMATION_DURATION)
652                        .translationX(0)
653                        .setInterpolator(AnimationUtils.loadInterpolator(
654                                mLauncher, android.R.interpolator.fast_out_slow_in));
655                    mPageIndicator.playEntryAnimation();
656
657                    if (updateAnimationFlag) {
658                        mInfo.setOption(FolderInfo.FLAG_MULTI_PAGE_ANIMATION, true,
659                                mLauncher.getModelWriter());
660                    }
661                }
662            });
663        } else {
664            mFolderName.setTranslationX(0);
665        }
666
667        mPageIndicator.stopAllAnimations();
668        anim.start();
669
670        // Make sure the folder picks up the last drag move even if the finger doesn't move.
671        if (mDragController.isDragging()) {
672            mDragController.forceTouchMove();
673        }
674
675        mContent.verifyVisibleHighResIcons(mContent.getNextPage());
676
677        // Notify the accessibility manager that this folder "window" has appeared and occluded
678        // the workspace items
679        sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
680        dragLayer.sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED);
681    }
682
683    public void beginExternalDrag() {
684        mEmptyCellRank = mContent.allocateRankForNewItem();
685        mIsExternalDrag = true;
686        mDragInProgress = true;
687
688        // Since this folder opened by another controller, it might not get onDrop or
689        // onDropComplete. Perform cleanup once drag-n-drop ends.
690        mDragController.addDragListener(this);
691    }
692
693    @Override
694    protected boolean isOfType(int type) {
695        return (type & TYPE_FOLDER) != 0;
696    }
697
698    @Override
699    protected void handleClose(boolean animate) {
700        mIsOpen = false;
701
702        if (isEditingName()) {
703            mFolderName.dispatchBackKey();
704        }
705
706        if (mFolderIcon != null) {
707            mFolderIcon.shrinkAndFadeIn(animate);
708        }
709
710        if (!(getParent() instanceof DragLayer)) return;
711        DragLayer parent = (DragLayer) getParent();
712
713        if (animate) {
714            animateClosed();
715        } else {
716            closeComplete(false);
717        }
718
719        // Notify the accessibility manager that this folder "window" has disappeared and no
720        // longer occludes the workspace items
721        parent.sendAccessibilityEvent(AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
722    }
723
724    private void animateClosed() {
725        final ObjectAnimator oa = LauncherAnimUtils.ofViewAlphaAndScale(this, 0, 0.9f, 0.9f);
726        oa.addListener(new AnimatorListenerAdapter() {
727            @Override
728            public void onAnimationEnd(Animator animation) {
729                setLayerType(LAYER_TYPE_NONE, null);
730                closeComplete(true);
731            }
732            @Override
733            public void onAnimationStart(Animator animation) {
734                Utilities.sendCustomAccessibilityEvent(
735                        Folder.this,
736                        AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED,
737                        getContext().getString(R.string.folder_closed));
738                mState = STATE_ANIMATING;
739            }
740        });
741        oa.setDuration(mExpandDuration);
742        setLayerType(LAYER_TYPE_HARDWARE, null);
743        oa.start();
744    }
745
746    private void closeComplete(boolean wasAnimated) {
747        // TODO: Clear all active animations.
748        DragLayer parent = (DragLayer) getParent();
749        if (parent != null) {
750            parent.removeView(this);
751        }
752        mDragController.removeDropTarget(this);
753        clearFocus();
754        if (wasAnimated) {
755            mFolderIcon.requestFocus();
756        }
757
758        if (mRearrangeOnClose) {
759            rearrangeChildren();
760            mRearrangeOnClose = false;
761        }
762        if (getItemCount() <= 1) {
763            if (!mDragInProgress && !mSuppressFolderDeletion) {
764                replaceFolderWithFinalItem();
765            } else if (mDragInProgress) {
766                mDeleteFolderOnDropCompleted = true;
767            }
768        }
769        mSuppressFolderDeletion = false;
770        clearDragInfo();
771        mState = STATE_SMALL;
772    }
773
774    public boolean acceptDrop(DragObject d) {
775        final ItemInfo item = d.dragInfo;
776        final int itemType = item.itemType;
777        return ((itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION ||
778                itemType == LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT ||
779                itemType == LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT) &&
780                    !isFull());
781    }
782
783    public void onDragEnter(DragObject d) {
784        mPrevTargetRank = -1;
785        mOnExitAlarm.cancelAlarm();
786        // Get the area offset such that the folder only closes if half the drag icon width
787        // is outside the folder area
788        mScrollAreaOffset = d.dragView.getDragRegionWidth() / 2 - d.xOffset;
789    }
790
791    OnAlarmListener mReorderAlarmListener = new OnAlarmListener() {
792        public void onAlarm(Alarm alarm) {
793            mContent.realTimeReorder(mEmptyCellRank, mTargetRank);
794            mEmptyCellRank = mTargetRank;
795        }
796    };
797
798    public boolean isLayoutRtl() {
799        return (getLayoutDirection() == LAYOUT_DIRECTION_RTL);
800    }
801
802    @Override
803    public void onDragOver(DragObject d) {
804        onDragOver(d, REORDER_DELAY);
805    }
806
807    private int getTargetRank(DragObject d, float[] recycle) {
808        recycle = d.getVisualCenter(recycle);
809        return mContent.findNearestArea(
810                (int) recycle[0] - getPaddingLeft(), (int) recycle[1] - getPaddingTop());
811    }
812
813    @Thunk void onDragOver(DragObject d, int reorderDelay) {
814        if (mScrollPauseAlarm.alarmPending()) {
815            return;
816        }
817        final float[] r = new float[2];
818        mTargetRank = getTargetRank(d, r);
819
820        if (mTargetRank != mPrevTargetRank) {
821            mReorderAlarm.cancelAlarm();
822            mReorderAlarm.setOnAlarmListener(mReorderAlarmListener);
823            mReorderAlarm.setAlarm(REORDER_DELAY);
824            mPrevTargetRank = mTargetRank;
825
826            if (d.stateAnnouncer != null) {
827                d.stateAnnouncer.announce(getContext().getString(R.string.move_to_position,
828                        mTargetRank + 1));
829            }
830        }
831
832        float x = r[0];
833        int currentPage = mContent.getNextPage();
834
835        float cellOverlap = mContent.getCurrentCellLayout().getCellWidth()
836                * ICON_OVERSCROLL_WIDTH_FACTOR;
837        boolean isOutsideLeftEdge = x < cellOverlap;
838        boolean isOutsideRightEdge = x > (getWidth() - cellOverlap);
839
840        if (currentPage > 0 && (mContent.mIsRtl ? isOutsideRightEdge : isOutsideLeftEdge)) {
841            showScrollHint(SCROLL_LEFT, d);
842        } else if (currentPage < (mContent.getPageCount() - 1)
843                && (mContent.mIsRtl ? isOutsideLeftEdge : isOutsideRightEdge)) {
844            showScrollHint(SCROLL_RIGHT, d);
845        } else {
846            mOnScrollHintAlarm.cancelAlarm();
847            if (mScrollHintDir != SCROLL_NONE) {
848                mContent.clearScrollHint();
849                mScrollHintDir = SCROLL_NONE;
850            }
851        }
852    }
853
854    private void showScrollHint(int direction, DragObject d) {
855        // Show scroll hint on the right
856        if (mScrollHintDir != direction) {
857            mContent.showScrollHint(direction);
858            mScrollHintDir = direction;
859        }
860
861        // Set alarm for when the hint is complete
862        if (!mOnScrollHintAlarm.alarmPending() || mCurrentScrollDir != direction) {
863            mCurrentScrollDir = direction;
864            mOnScrollHintAlarm.cancelAlarm();
865            mOnScrollHintAlarm.setOnAlarmListener(new OnScrollHintListener(d));
866            mOnScrollHintAlarm.setAlarm(SCROLL_HINT_DURATION);
867
868            mReorderAlarm.cancelAlarm();
869            mTargetRank = mEmptyCellRank;
870        }
871    }
872
873    OnAlarmListener mOnExitAlarmListener = new OnAlarmListener() {
874        public void onAlarm(Alarm alarm) {
875            completeDragExit();
876        }
877    };
878
879    public void completeDragExit() {
880        if (mIsOpen) {
881            close(true);
882            mRearrangeOnClose = true;
883        } else if (mState == STATE_ANIMATING) {
884            mRearrangeOnClose = true;
885        } else {
886            rearrangeChildren();
887            clearDragInfo();
888        }
889    }
890
891    private void clearDragInfo() {
892        mCurrentDragView = null;
893        mIsExternalDrag = false;
894    }
895
896    public void onDragExit(DragObject d) {
897        // We only close the folder if this is a true drag exit, ie. not because
898        // a drop has occurred above the folder.
899        if (!d.dragComplete) {
900            mOnExitAlarm.setOnAlarmListener(mOnExitAlarmListener);
901            mOnExitAlarm.setAlarm(ON_EXIT_CLOSE_DELAY);
902        }
903        mReorderAlarm.cancelAlarm();
904
905        mOnScrollHintAlarm.cancelAlarm();
906        mScrollPauseAlarm.cancelAlarm();
907        if (mScrollHintDir != SCROLL_NONE) {
908            mContent.clearScrollHint();
909            mScrollHintDir = SCROLL_NONE;
910        }
911    }
912
913    /**
914     * When performing an accessibility drop, onDrop is sent immediately after onDragEnter. So we
915     * need to complete all transient states based on timers.
916     */
917    @Override
918    public void prepareAccessibilityDrop() {
919        if (mReorderAlarm.alarmPending()) {
920            mReorderAlarm.cancelAlarm();
921            mReorderAlarmListener.onAlarm(mReorderAlarm);
922        }
923    }
924
925    public void onDropCompleted(final View target, final DragObject d,
926            final boolean isFlingToDelete, final boolean success) {
927        if (mDeferDropAfterUninstall) {
928            Log.d(TAG, "Deferred handling drop because waiting for uninstall.");
929            mDeferredAction = new Runnable() {
930                    public void run() {
931                        onDropCompleted(target, d, isFlingToDelete, success);
932                        mDeferredAction = null;
933                    }
934                };
935            return;
936        }
937
938        boolean beingCalledAfterUninstall = mDeferredAction != null;
939        boolean successfulDrop =
940                success && (!beingCalledAfterUninstall || mUninstallSuccessful);
941
942        if (successfulDrop) {
943            if (mDeleteFolderOnDropCompleted && !mItemAddedBackToSelfViaIcon && target != this) {
944                replaceFolderWithFinalItem();
945            }
946        } else {
947            // The drag failed, we need to return the item to the folder
948            ShortcutInfo info = (ShortcutInfo) d.dragInfo;
949            View icon = (mCurrentDragView != null && mCurrentDragView.getTag() == info)
950                    ? mCurrentDragView : mContent.createNewView(info);
951            ArrayList<View> views = getItemsInReadingOrder();
952            views.add(info.rank, icon);
953            mContent.arrangeChildren(views, views.size());
954            mItemsInvalidated = true;
955
956            try (SuppressInfoChanges s = new SuppressInfoChanges()) {
957                mFolderIcon.onDrop(d);
958            }
959        }
960
961        if (target != this) {
962            if (mOnExitAlarm.alarmPending()) {
963                mOnExitAlarm.cancelAlarm();
964                if (!successfulDrop) {
965                    mSuppressFolderDeletion = true;
966                }
967                mScrollPauseAlarm.cancelAlarm();
968                completeDragExit();
969            }
970        }
971
972        mDeleteFolderOnDropCompleted = false;
973        mDragInProgress = false;
974        mItemAddedBackToSelfViaIcon = false;
975        mCurrentDragView = null;
976
977        // Reordering may have occured, and we need to save the new item locations. We do this once
978        // at the end to prevent unnecessary database operations.
979        updateItemLocationsInDatabaseBatch();
980
981        // Use the item count to check for multi-page as the folder UI may not have
982        // been refreshed yet.
983        if (getItemCount() <= mContent.itemsPerPage()) {
984            // Show the animation, next time something is added to the folder.
985            mInfo.setOption(FolderInfo.FLAG_MULTI_PAGE_ANIMATION, false,
986                    mLauncher.getModelWriter());
987        }
988
989        if (!isFlingToDelete) {
990            // Fling to delete already exits spring loaded mode after the animation finishes.
991            mLauncher.exitSpringLoadedDragModeDelayed(successfulDrop,
992                    Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT, null);
993        }
994    }
995
996    @Override
997    public void deferCompleteDropAfterUninstallActivity() {
998        mDeferDropAfterUninstall = true;
999    }
1000
1001    @Override
1002    public void onDragObjectRemoved(boolean success) {
1003        mDeferDropAfterUninstall = false;
1004        mUninstallSuccessful = success;
1005        if (mDeferredAction != null) {
1006            mDeferredAction.run();
1007        }
1008    }
1009
1010    @Override
1011    public float getIntrinsicIconScaleFactor() {
1012        return 1f;
1013    }
1014
1015    @Override
1016    public boolean supportsAppInfoDropTarget() {
1017        return true;
1018    }
1019
1020    @Override
1021    public boolean supportsDeleteDropTarget() {
1022        return true;
1023    }
1024
1025    private void updateItemLocationsInDatabaseBatch() {
1026        ArrayList<View> list = getItemsInReadingOrder();
1027        ArrayList<ItemInfo> items = new ArrayList<ItemInfo>();
1028        for (int i = 0; i < list.size(); i++) {
1029            View v = list.get(i);
1030            ItemInfo info = (ItemInfo) v.getTag();
1031            info.rank = i;
1032            items.add(info);
1033        }
1034
1035        mLauncher.getModelWriter().moveItemsInDatabase(items, mInfo.id, 0);
1036    }
1037
1038    public void notifyDrop() {
1039        if (mDragInProgress) {
1040            mItemAddedBackToSelfViaIcon = true;
1041        }
1042    }
1043
1044    public boolean isDropEnabled() {
1045        return true;
1046    }
1047
1048    public boolean isFull() {
1049        return mContent.isFull();
1050    }
1051
1052    private void centerAboutIcon() {
1053        DeviceProfile grid = mLauncher.getDeviceProfile();
1054
1055        DragLayer.LayoutParams lp = (DragLayer.LayoutParams) getLayoutParams();
1056        DragLayer parent = (DragLayer) mLauncher.findViewById(R.id.drag_layer);
1057        int width = getFolderWidth();
1058        int height = getFolderHeight();
1059
1060        float scale = parent.getDescendantRectRelativeToSelf(mFolderIcon, sTempRect);
1061        int centerX = sTempRect.centerX();
1062        int centerY = sTempRect.centerY();
1063        int centeredLeft = centerX - width / 2;
1064        int centeredTop = centerY - height / 2;
1065
1066        // We need to bound the folder to the currently visible workspace area
1067        mLauncher.getWorkspace().getPageAreaRelativeToDragLayer(sTempRect);
1068        int left = Math.min(Math.max(sTempRect.left, centeredLeft),
1069                sTempRect.right- width);
1070        int top = Math.min(Math.max(sTempRect.top, centeredTop),
1071                sTempRect.bottom - height);
1072
1073        int distFromEdgeOfScreen = mLauncher.getWorkspace().getPaddingLeft() + getPaddingLeft();
1074
1075        if (grid.isPhone && (grid.availableWidthPx - width) < 4 * distFromEdgeOfScreen) {
1076            // Center the folder if it is very close to being centered anyway, by virtue of
1077            // filling the majority of the viewport. ie. remove it from the uncanny valley
1078            // of centeredness.
1079            left = (grid.availableWidthPx - width) / 2;
1080        } else if (width >= sTempRect.width()) {
1081            // If the folder doesn't fit within the bounds, center it about the desired bounds
1082            left = sTempRect.left + (sTempRect.width() - width) / 2;
1083        }
1084        if (height >= sTempRect.height()) {
1085            // Folder height is greater than page height, center on page
1086            top = sTempRect.top + (sTempRect.height() - height) / 2;
1087        } else {
1088            // Folder height is less than page height, so bound it to the absolute open folder
1089            // bounds if necessary
1090            Rect folderBounds = grid.getAbsoluteOpenFolderBounds();
1091            left = Math.max(folderBounds.left, Math.min(left, folderBounds.right - width));
1092            top = Math.max(folderBounds.top, Math.min(top, folderBounds.bottom - height));
1093        }
1094
1095        int folderPivotX = width / 2 + (centeredLeft - left);
1096        int folderPivotY = height / 2 + (centeredTop - top);
1097        setPivotX(folderPivotX);
1098        setPivotY(folderPivotY);
1099
1100        mFolderIconPivotX = (int) (mFolderIcon.getMeasuredWidth() *
1101                (1.0f * folderPivotX / width));
1102        mFolderIconPivotY = (int) (mFolderIcon.getMeasuredHeight() *
1103                (1.0f * folderPivotY / height));
1104
1105        lp.width = width;
1106        lp.height = height;
1107        lp.x = left;
1108        lp.y = top;
1109    }
1110
1111    public float getPivotXForIconAnimation() {
1112        return mFolderIconPivotX;
1113    }
1114    public float getPivotYForIconAnimation() {
1115        return mFolderIconPivotY;
1116    }
1117
1118    private int getContentAreaHeight() {
1119        DeviceProfile grid = mLauncher.getDeviceProfile();
1120        int maxContentAreaHeight = grid.availableHeightPx
1121                - grid.getTotalWorkspacePadding().y - mFooterHeight;
1122        int height = Math.min(maxContentAreaHeight,
1123                mContent.getDesiredHeight());
1124        return Math.max(height, MIN_CONTENT_DIMEN);
1125    }
1126
1127    private int getContentAreaWidth() {
1128        return Math.max(mContent.getDesiredWidth(), MIN_CONTENT_DIMEN);
1129    }
1130
1131    private int getFolderWidth() {
1132        return getPaddingLeft() + getPaddingRight() + mContent.getDesiredWidth();
1133    }
1134
1135    private int getFolderHeight() {
1136        return getFolderHeight(getContentAreaHeight());
1137    }
1138
1139    private int getFolderHeight(int contentAreaHeight) {
1140        return getPaddingTop() + getPaddingBottom() + contentAreaHeight + mFooterHeight;
1141    }
1142
1143    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
1144        int contentWidth = getContentAreaWidth();
1145        int contentHeight = getContentAreaHeight();
1146
1147        int contentAreaWidthSpec = MeasureSpec.makeMeasureSpec(contentWidth, MeasureSpec.EXACTLY);
1148        int contentAreaHeightSpec = MeasureSpec.makeMeasureSpec(contentHeight, MeasureSpec.EXACTLY);
1149
1150        mContent.setFixedSize(contentWidth, contentHeight);
1151        mContent.measure(contentAreaWidthSpec, contentAreaHeightSpec);
1152
1153        if (mContent.getChildCount() > 0) {
1154            int cellIconGap = (mContent.getPageAt(0).getCellWidth()
1155                    - mLauncher.getDeviceProfile().iconSizePx) / 2;
1156            mFooter.setPadding(mContent.getPaddingLeft() + cellIconGap,
1157                    mFooter.getPaddingTop(),
1158                    mContent.getPaddingRight() + cellIconGap,
1159                    mFooter.getPaddingBottom());
1160        }
1161        mFooter.measure(contentAreaWidthSpec,
1162                MeasureSpec.makeMeasureSpec(mFooterHeight, MeasureSpec.EXACTLY));
1163
1164        int folderWidth = getPaddingLeft() + getPaddingRight() + contentWidth;
1165        int folderHeight = getFolderHeight(contentHeight);
1166        setMeasuredDimension(folderWidth, folderHeight);
1167    }
1168
1169    /**
1170     * Rearranges the children based on their rank.
1171     */
1172    public void rearrangeChildren() {
1173        rearrangeChildren(-1);
1174    }
1175
1176    /**
1177     * Rearranges the children based on their rank.
1178     * @param itemCount if greater than the total children count, empty spaces are left at the end,
1179     * otherwise it is ignored.
1180     */
1181    public void rearrangeChildren(int itemCount) {
1182        ArrayList<View> views = getItemsInReadingOrder();
1183        mContent.arrangeChildren(views, Math.max(itemCount, views.size()));
1184        mItemsInvalidated = true;
1185    }
1186
1187    public int getItemCount() {
1188        return mContent.getItemCount();
1189    }
1190
1191    @Thunk void replaceFolderWithFinalItem() {
1192        // Add the last remaining child to the workspace in place of the folder
1193        Runnable onCompleteRunnable = new Runnable() {
1194            @Override
1195            public void run() {
1196                int itemCount = mInfo.contents.size();
1197                if (itemCount <= 1) {
1198                    View newIcon = null;
1199
1200                    if (itemCount == 1) {
1201                        // Move the item from the folder to the workspace, in the position of the
1202                        // folder
1203                        CellLayout cellLayout = mLauncher.getCellLayout(mInfo.container,
1204                                mInfo.screenId);
1205                        ShortcutInfo finalItem = mInfo.contents.remove(0);
1206                        newIcon = mLauncher.createShortcut(cellLayout, finalItem);
1207                        mLauncher.getModelWriter().addOrMoveItemInDatabase(finalItem,
1208                                mInfo.container, mInfo.screenId, mInfo.cellX, mInfo.cellY);
1209                    }
1210
1211                    // Remove the folder
1212                    mLauncher.removeItem(mFolderIcon, mInfo, true /* deleteFromDb */);
1213                    if (mFolderIcon instanceof DropTarget) {
1214                        mDragController.removeDropTarget((DropTarget) mFolderIcon);
1215                    }
1216
1217                    if (newIcon != null) {
1218                        // We add the child after removing the folder to prevent both from existing
1219                        // at the same time in the CellLayout.  We need to add the new item with
1220                        // addInScreenFromBind() to ensure that hotseat items are placed correctly.
1221                        mLauncher.getWorkspace().addInScreenFromBind(newIcon, mInfo);
1222
1223                        // Focus the newly created child
1224                        newIcon.requestFocus();
1225                    }
1226                }
1227            }
1228        };
1229        View finalChild = mContent.getLastItem();
1230        if (finalChild != null) {
1231            mFolderIcon.performDestroyAnimation(finalChild, onCompleteRunnable);
1232        } else {
1233            onCompleteRunnable.run();
1234        }
1235        mDestroyed = true;
1236    }
1237
1238    public boolean isDestroyed() {
1239        return mDestroyed;
1240    }
1241
1242    // This method keeps track of the first and last item in the folder for the purposes
1243    // of keyboard focus
1244    public void updateTextViewFocus() {
1245        final View firstChild = mContent.getFirstItem();
1246        final View lastChild = mContent.getLastItem();
1247        if (firstChild != null && lastChild != null) {
1248            mFolderName.setNextFocusDownId(lastChild.getId());
1249            mFolderName.setNextFocusRightId(lastChild.getId());
1250            mFolderName.setNextFocusLeftId(lastChild.getId());
1251            mFolderName.setNextFocusUpId(lastChild.getId());
1252            // Hitting TAB from the folder name wraps around to the first item on the current
1253            // folder page, and hitting SHIFT+TAB from that item wraps back to the folder name.
1254            mFolderName.setNextFocusForwardId(firstChild.getId());
1255            // When clicking off the folder when editing the name, this Folder gains focus. When
1256            // pressing an arrow key from that state, give the focus to the first item.
1257            this.setNextFocusDownId(firstChild.getId());
1258            this.setNextFocusRightId(firstChild.getId());
1259            this.setNextFocusLeftId(firstChild.getId());
1260            this.setNextFocusUpId(firstChild.getId());
1261            // When pressing shift+tab in the above state, give the focus to the last item.
1262            setOnKeyListener(new OnKeyListener() {
1263                @Override
1264                public boolean onKey(View v, int keyCode, KeyEvent event) {
1265                    boolean isShiftPlusTab = keyCode == KeyEvent.KEYCODE_TAB &&
1266                            event.hasModifiers(KeyEvent.META_SHIFT_ON);
1267                    if (isShiftPlusTab && Folder.this.isFocused()) {
1268                        return lastChild.requestFocus();
1269                    }
1270                    return false;
1271                }
1272            });
1273        }
1274    }
1275
1276    public void onDrop(DragObject d) {
1277        Runnable cleanUpRunnable = null;
1278
1279        // If we are coming from All Apps space, we defer removing the extra empty screen
1280        // until the folder closes
1281        if (d.dragSource != mLauncher.getWorkspace() && !(d.dragSource instanceof Folder)) {
1282            cleanUpRunnable = new Runnable() {
1283                @Override
1284                public void run() {
1285                    mLauncher.exitSpringLoadedDragModeDelayed(true,
1286                            Launcher.EXIT_SPRINGLOADED_MODE_SHORT_TIMEOUT,
1287                            null);
1288                }
1289            };
1290        }
1291
1292        // If the icon was dropped while the page was being scrolled, we need to compute
1293        // the target location again such that the icon is placed of the final page.
1294        if (!mContent.rankOnCurrentPage(mEmptyCellRank)) {
1295            // Reorder again.
1296            mTargetRank = getTargetRank(d, null);
1297
1298            // Rearrange items immediately.
1299            mReorderAlarmListener.onAlarm(mReorderAlarm);
1300
1301            mOnScrollHintAlarm.cancelAlarm();
1302            mScrollPauseAlarm.cancelAlarm();
1303        }
1304        mContent.completePendingPageChanges();
1305
1306        View currentDragView;
1307        final ShortcutInfo si;
1308        if (d.dragInfo instanceof AppInfo) {
1309            // Came from all apps -- make a copy.
1310            si = ((AppInfo) d.dragInfo).makeShortcut();
1311        } else {
1312            // ShortcutInfo
1313            si = (ShortcutInfo) d.dragInfo;
1314        }
1315        if (mIsExternalDrag) {
1316            currentDragView = mContent.createAndAddViewForRank(si, mEmptyCellRank);
1317            // Actually move the item in the database if it was an external drag. Call this
1318            // before creating the view, so that ShortcutInfo is updated appropriately.
1319            mLauncher.getModelWriter().addOrMoveItemInDatabase(
1320                    si, mInfo.id, 0, si.cellX, si.cellY);
1321
1322            // We only need to update the locations if it doesn't get handled in #onDropCompleted.
1323            if (d.dragSource != this) {
1324                updateItemLocationsInDatabaseBatch();
1325            }
1326            mIsExternalDrag = false;
1327        } else {
1328            currentDragView = mCurrentDragView;
1329            mContent.addViewForRank(currentDragView, si, mEmptyCellRank);
1330        }
1331
1332        if (d.dragView.hasDrawn()) {
1333
1334            // Temporarily reset the scale such that the animation target gets calculated correctly.
1335            float scaleX = getScaleX();
1336            float scaleY = getScaleY();
1337            setScaleX(1.0f);
1338            setScaleY(1.0f);
1339            mLauncher.getDragLayer().animateViewIntoPosition(d.dragView, currentDragView,
1340                    cleanUpRunnable, null);
1341            setScaleX(scaleX);
1342            setScaleY(scaleY);
1343        } else {
1344            d.deferDragViewCleanupPostAnimation = false;
1345            currentDragView.setVisibility(VISIBLE);
1346        }
1347        mItemsInvalidated = true;
1348        rearrangeChildren();
1349
1350        // Temporarily suppress the listener, as we did all the work already here.
1351        try (SuppressInfoChanges s = new SuppressInfoChanges()) {
1352            mInfo.add(si, false);
1353        }
1354
1355        // Clear the drag info, as it is no longer being dragged.
1356        mDragInProgress = false;
1357
1358        if (mContent.getPageCount() > 1) {
1359            // The animation has already been shown while opening the folder.
1360            mInfo.setOption(FolderInfo.FLAG_MULTI_PAGE_ANIMATION, true, mLauncher.getModelWriter());
1361        }
1362
1363        if (d.stateAnnouncer != null) {
1364            d.stateAnnouncer.completeAction(R.string.item_moved);
1365        }
1366    }
1367
1368    // This is used so the item doesn't immediately appear in the folder when added. In one case
1369    // we need to create the illusion that the item isn't added back to the folder yet, to
1370    // to correspond to the animation of the icon back into the folder. This is
1371    public void hideItem(ShortcutInfo info) {
1372        View v = getViewForInfo(info);
1373        v.setVisibility(INVISIBLE);
1374    }
1375    public void showItem(ShortcutInfo info) {
1376        View v = getViewForInfo(info);
1377        v.setVisibility(VISIBLE);
1378    }
1379
1380    @Override
1381    public void onAdd(ShortcutInfo item) {
1382        mContent.createAndAddViewForRank(item, mContent.allocateRankForNewItem());
1383        mItemsInvalidated = true;
1384        mLauncher.getModelWriter().addOrMoveItemInDatabase(
1385                item, mInfo.id, 0, item.cellX, item.cellY);
1386    }
1387
1388    public void onRemove(ShortcutInfo item) {
1389        mItemsInvalidated = true;
1390        View v = getViewForInfo(item);
1391        mContent.removeItem(v);
1392        if (mState == STATE_ANIMATING) {
1393            mRearrangeOnClose = true;
1394        } else {
1395            rearrangeChildren();
1396        }
1397        if (getItemCount() <= 1) {
1398            if (mIsOpen) {
1399                close(true);
1400            } else {
1401                replaceFolderWithFinalItem();
1402            }
1403        }
1404    }
1405
1406    private View getViewForInfo(final ShortcutInfo item) {
1407        return mContent.iterateOverItems(new ItemOperator() {
1408
1409            @Override
1410            public boolean evaluate(ItemInfo info, View view) {
1411                return info == item;
1412            }
1413        });
1414    }
1415
1416    @Override
1417    public void onItemsChanged(boolean animate) {
1418        updateTextViewFocus();
1419    }
1420
1421    @Override
1422    public void prepareAutoUpdate() {
1423        close(false);
1424    }
1425
1426    public void onTitleChanged(CharSequence title) {
1427    }
1428
1429    public ArrayList<View> getItemsInReadingOrder() {
1430        if (mItemsInvalidated) {
1431            mItemsInReadingOrder.clear();
1432            mContent.iterateOverItems(new ItemOperator() {
1433
1434                @Override
1435                public boolean evaluate(ItemInfo info, View view) {
1436                    mItemsInReadingOrder.add(view);
1437                    return false;
1438                }
1439            });
1440            mItemsInvalidated = false;
1441        }
1442        return mItemsInReadingOrder;
1443    }
1444
1445    public void onFocusChange(View v, boolean hasFocus) {
1446        if (v == mFolderName) {
1447            if (hasFocus) {
1448                startEditingFolderName();
1449            } else {
1450                mFolderName.dispatchBackKey();
1451            }
1452        }
1453    }
1454
1455    @Override
1456    public void getHitRectRelativeToDragLayer(Rect outRect) {
1457        getHitRect(outRect);
1458        outRect.left -= mScrollAreaOffset;
1459        outRect.right += mScrollAreaOffset;
1460    }
1461
1462    @Override
1463    public void fillInLogContainerData(View v, ItemInfo info, Target target, Target targetParent) {
1464        target.gridX = info.cellX;
1465        target.gridY = info.cellY;
1466        target.pageIndex = mContent.getCurrentPage();
1467        targetParent.containerType = ContainerType.FOLDER;
1468    }
1469
1470    private class OnScrollHintListener implements OnAlarmListener {
1471
1472        private final DragObject mDragObject;
1473
1474        OnScrollHintListener(DragObject object) {
1475            mDragObject = object;
1476        }
1477
1478        /**
1479         * Scroll hint has been shown long enough. Now scroll to appropriate page.
1480         */
1481        @Override
1482        public void onAlarm(Alarm alarm) {
1483            if (mCurrentScrollDir == SCROLL_LEFT) {
1484                mContent.scrollLeft();
1485                mScrollHintDir = SCROLL_NONE;
1486            } else if (mCurrentScrollDir == SCROLL_RIGHT) {
1487                mContent.scrollRight();
1488                mScrollHintDir = SCROLL_NONE;
1489            } else {
1490                // This should not happen
1491                return;
1492            }
1493            mCurrentScrollDir = SCROLL_NONE;
1494
1495            // Pause drag event until the scrolling is finished
1496            mScrollPauseAlarm.setOnAlarmListener(new OnScrollFinishedListener(mDragObject));
1497            mScrollPauseAlarm.setAlarm(RESCROLL_DELAY);
1498        }
1499    }
1500
1501    private class OnScrollFinishedListener implements OnAlarmListener {
1502
1503        private final DragObject mDragObject;
1504
1505        OnScrollFinishedListener(DragObject object) {
1506            mDragObject = object;
1507        }
1508
1509        /**
1510         * Page scroll is complete.
1511         */
1512        @Override
1513        public void onAlarm(Alarm alarm) {
1514            // Reorder immediately on page change.
1515            onDragOver(mDragObject, 1);
1516        }
1517    }
1518
1519    // Compares item position based on rank and position giving priority to the rank.
1520    public static final Comparator<ItemInfo> ITEM_POS_COMPARATOR = new Comparator<ItemInfo>() {
1521
1522        @Override
1523        public int compare(ItemInfo lhs, ItemInfo rhs) {
1524            if (lhs.rank != rhs.rank) {
1525                return lhs.rank - rhs.rank;
1526            } else if (lhs.cellY != rhs.cellY) {
1527                return lhs.cellY - rhs.cellY;
1528            } else {
1529                return lhs.cellX - rhs.cellX;
1530            }
1531        }
1532    };
1533
1534    /**
1535     * Temporary resource held while we don't want to handle info changes
1536     */
1537    private class SuppressInfoChanges implements AutoCloseable {
1538
1539        SuppressInfoChanges() {
1540            mInfo.removeListener(Folder.this);
1541        }
1542
1543        @Override
1544        public void close() {
1545            mInfo.addListener(Folder.this);
1546            updateTextViewFocus();
1547        }
1548    }
1549
1550    /**
1551     * Returns a folder which is already open or null
1552     */
1553    public static Folder getOpen(Launcher launcher) {
1554        return getOpenView(launcher, TYPE_FOLDER);
1555    }
1556
1557    @Override
1558    public int getLogContainerType() {
1559        return ContainerType.FOLDER;
1560    }
1561}
1562