Merge "Removing QsbBlockerView" into ub-launcher3-dorval-polish

12 files changed, 8 insertions, 378 deletions

diff --git a/res/layout-land/launcher.xml b/res/layout-land/launcher.xml
index 1e82f2276..4e09ef953 100644
--- a/res/layout-land/launcher.xml
+++ b/res/layout-land/launcher.xml
@@ -67,12 +67,6 @@
             android:layout_height="@dimen/dynamic_grid_page_indicator_height"
             android:layout_gravity="bottom|left"/>
 
-        <!-- A place holder view instead of the QSB in transposed layout -->
-        <View
-            android:layout_width="0dp"
-            android:layout_height="10dp"
-            android:id="@+id/workspace_blocked_row" />
-
         <include layout="@layout/widgets_view"
             android:id="@+id/widgets_view"
             android:layout_width="match_parent"
diff --git a/res/layout-port/launcher.xml b/res/layout-port/launcher.xml
index c15e53d8d..0f88698f0 100644
--- a/res/layout-port/launcher.xml
+++ b/res/layout-port/launcher.xml
@@ -66,10 +66,6 @@
             android:id="@+id/drop_target_bar"
             layout="@layout/drop_target_bar_horz" />
 
-        <include
-            layout="@layout/qsb_container"
-            android:id="@+id/qsb_container" />
-
         <include layout="@layout/widgets_view"
             android:id="@+id/widgets_view"
             android:layout_width="match_parent"
diff --git a/res/layout-sw720dp/launcher.xml b/res/layout-sw720dp/launcher.xml
index c516c4697..b9b94b6b0 100644
--- a/res/layout-sw720dp/launcher.xml
+++ b/res/layout-sw720dp/launcher.xml
@@ -65,10 +65,6 @@
         <include layout="@layout/page_indicator"
                  android:id="@+id/page_indicator" />
 
-        <include
-            layout="@layout/qsb_container"
-            android:id="@+id/qsb_container" />
-
         <include layout="@layout/widgets_view"
             android:id="@+id/widgets_view"
             android:layout_width="match_parent"
diff --git a/res/layout/qsb_blocker_view.xml b/res/layout/qsb_blocker_view.xml
deleted file mode 100644
index 453eebe4f..000000000
--- a/res/layout/qsb_blocker_view.xml
+++ /dev/null
@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-     Copyright (C) 2016 The Android Open Source Project
-
-     Licensed under the Apache License, Version 2.0 (the "License");
-     you may not use this file except in compliance with the License.
-     You may obtain a copy of the License at
-
-          http://www.apache.org/licenses/LICENSE-2.0
-
-     Unless required by applicable law or agreed to in writing, software
-     distributed under the License is distributed on an "AS IS" BASIS,
-     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-     See the License for the specific language governing permissions and
-     limitations under the License.
--->
-<com.android.launcher3.qsb.QsbBlockerView
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent" />
\ No newline at end of file
diff --git a/res/values/config.xml b/res/values/config.xml
index 6df556b8d..d2272f256 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -114,9 +114,6 @@
     <!-- View ID to use for QSB widget -->
     <item type="id" name="qsb_widget" />
 
-    <!-- View ID to use for blocked area on the first screen -->
-    <item type="id" name="workspace_blocked_row" />
-
     <!-- View ID used by cell layout to jail its content -->
     <item type="id" name="cell_layout_jail_id" />
 
diff --git a/src/com/android/launcher3/DeviceProfile.java b/src/com/android/launcher3/DeviceProfile.java
index 508fc3406..9bb56d603 100644
--- a/src/com/android/launcher3/DeviceProfile.java
+++ b/src/com/android/launcher3/DeviceProfile.java
@@ -532,14 +532,6 @@ public class DeviceProfile {
                 workspacePadding.bottom);
         workspace.setPageSpacing(getWorkspacePageSpacing());
 
-        // Only display when enabled
-        if (FeatureFlags.QSB_ON_FIRST_SCREEN) {
-            View qsbContainer = launcher.getQsbContainer();
-            lp = (FrameLayout.LayoutParams) qsbContainer.getLayoutParams();
-            lp.topMargin = mInsets.top + workspacePadding.top;
-            qsbContainer.setLayoutParams(lp);
-        }
-
         // Layout the hotseat
         Hotseat hotseat = (Hotseat) launcher.findViewById(R.id.hotseat);
         lp = (FrameLayout.LayoutParams) hotseat.getLayoutParams();
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 909853e06..d23badc58 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -224,7 +224,6 @@ public class Launcher extends BaseActivity
     private View mLauncherView;
     @Thunk DragLayer mDragLayer;
     private DragController mDragController;
-    private View mQsbContainer;
 
     public View mWeightWatcher;
 
@@ -1278,9 +1277,7 @@ public class Launcher extends BaseActivity
     private void setupViews() {
         mDragLayer = (DragLayer) findViewById(R.id.drag_layer);
         mFocusHandler = mDragLayer.getFocusIndicatorHelper();
-        mWorkspace = (Workspace) mDragLayer.findViewById(R.id.workspace);
-        mQsbContainer = mDragLayer.findViewById(mDeviceProfile.isVerticalBarLayout()
-                ? R.id.workspace_blocked_row : R.id.qsb_container);
+        mWorkspace = mDragLayer.findViewById(R.id.workspace);
         mWorkspace.initParentViews(mDragLayer);
 
         mLauncherView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
@@ -1667,10 +1664,6 @@ public class Launcher extends BaseActivity
         return mWorkspace;
     }
 
-    public View getQsbContainer() {
-        return mQsbContainer;
-    }
-
     public Hotseat getHotseat() {
         return mHotseat;
     }
diff --git a/src/com/android/launcher3/PinchAnimationManager.java b/src/com/android/launcher3/PinchAnimationManager.java
index f8196e5f6..c3d3bb3df 100644
--- a/src/com/android/launcher3/PinchAnimationManager.java
+++ b/src/com/android/launcher3/PinchAnimationManager.java
@@ -56,11 +56,10 @@ public class PinchAnimationManager {
     private static final LinearInterpolator INTERPOLATOR = new LinearInterpolator();
 
     private static final int INDEX_HOTSEAT = 0;
-    private static final int INDEX_QSB = 1;
-    private static final int INDEX_OVERVIEW_PANEL_BUTTONS = 2;
-    private static final int INDEX_SCRIM = 3;
+    private static final int INDEX_OVERVIEW_PANEL_BUTTONS = 1;
+    private static final int INDEX_SCRIM = 2;
 
-    private final Animator[] mAnimators = new Animator[4];
+    private final Animator[] mAnimators = new Animator[3];
 
     private Launcher mLauncher;
     private Workspace mWorkspace;
@@ -196,8 +195,6 @@ public class PinchAnimationManager {
     private void animateHotseatAndQsb(boolean show) {
         startAnimator(INDEX_HOTSEAT,
                 mWorkspace.createHotseatAlphaAnimator(show ? 1 : 0), THRESHOLD_ANIM_DURATION);
-        startAnimator(INDEX_QSB, mWorkspace.mQsbAlphaController.animateAlphaAtIndex(
-                show ? 1 : 0, Workspace.QSB_ALPHA_INDEX_STATE_CHANGE), THRESHOLD_ANIM_DURATION);
     }
 
     private void animateOverviewPanelButtons(boolean show) {
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index ea4a662d3..ce92c8eb0 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -80,7 +80,6 @@ import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
 import com.android.launcher3.util.ItemInfoMatcher;
 import com.android.launcher3.util.LongArrayMap;
-import com.android.launcher3.util.MultiStateAlphaController;
 import com.android.launcher3.util.PackageUserKey;
 import com.android.launcher3.util.Thunk;
 import com.android.launcher3.util.VerticalFlingDetector;
@@ -234,14 +233,6 @@ public class Workspace extends PagedView
      */
     private float[] mHotseatAlpha = new float[] {1, 1, 1};
 
-    public static final int QSB_ALPHA_INDEX_STATE_CHANGE = 0;
-    public static final int QSB_ALPHA_INDEX_Y_TRANSLATION = 1;
-    public static final int QSB_ALPHA_INDEX_PAGE_SCROLL = 2;
-    public static final int QSB_ALPHA_INDEX_OVERLAY_SCROLL = 3;
-
-
-    MultiStateAlphaController mQsbAlphaController;
-
     @ViewDebug.ExportedProperty(category = "launcher")
     private State mState = State.NORMAL;
     private boolean mIsSwitchingState = false;
@@ -323,7 +314,6 @@ public class Workspace extends PagedView
     private WorkspaceStateTransitionAnimation mStateTransitionAnimation;
 
     private AccessibilityDelegate mPagesAccessibilityDelegate;
-    private OnStateChangeListener mOnStateChangeListener;
 
     /**
      * Used to inflate the Workspace from XML.
@@ -378,10 +368,6 @@ public class Workspace extends PagedView
         }
     }
 
-    public void setOnStateChangeListener(OnStateChangeListener listener) {
-        mOnStateChangeListener = listener;
-    }
-
     /**
      * Estimates the size of an item using spans: hSpan, vSpan.
      *
@@ -536,7 +522,6 @@ public class Workspace extends PagedView
     public void initParentViews(View parent) {
         super.initParentViews(parent);
         mPageIndicator.setAccessibilityDelegate(new OverviewAccessibilityDelegate());
-        mQsbAlphaController = new MultiStateAlphaController(mLauncher.getQsbContainer(), 4);
     }
 
     private int getDefaultPage() {
@@ -576,11 +561,6 @@ public class Workspace extends PagedView
         return mTouchState != TOUCH_STATE_REST;
     }
 
-    private int getEmbeddedQsbId() {
-        return mLauncher.getDeviceProfile().isVerticalBarLayout()
-                ? R.id.qsb_container : R.id.workspace_blocked_row;
-    }
-
     /**
      * Initializes and binds the first page
      * @param qsb an existing qsb to recycle or null.
@@ -622,41 +602,17 @@ public class Workspace extends PagedView
         if (qsb == null) {
             // In transposed layout, we add the QSB in the Grid. As workspace does not touch the
             // edges, we do not need a full width QSB.
-            qsb = LayoutInflater.from(getContext()).inflate(
-                    mLauncher.getDeviceProfile().isVerticalBarLayout()
-                            ? R.layout.qsb_container : R.layout.qsb_blocker_view,
-                    firstPage, false);
+            qsb = LayoutInflater.from(getContext())
+                    .inflate(R.layout.qsb_container,firstPage, false);
         }
 
         CellLayout.LayoutParams lp = new CellLayout.LayoutParams(0, 0, firstPage.getCountX(), 1);
         lp.canReorder = false;
-        if (!firstPage.addViewToCellLayout(qsb, 0, getEmbeddedQsbId(), lp, true)) {
+        if (!firstPage.addViewToCellLayout(qsb, 0, R.id.qsb_container, lp, true)) {
             Log.e(TAG, "Failed to add to item at (0, 0) to CellLayout");
         }
     }
 
-    @Override
-    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
-
-        // Update the QSB to match the cell height. This is treating the QSB essentially as a child
-        // of workspace despite that it's not a true child.
-        // Note that it relies on the strict ordering of measuring the workspace before the QSB
-        // at the dragLayer level.
-        // Only measure the QSB when the view is enabled
-        if (FeatureFlags.QSB_ON_FIRST_SCREEN && getChildCount() > 0) {
-            CellLayout firstPage = (CellLayout) getChildAt(0);
-            int cellHeight = firstPage.getCellHeight();
-
-            View qsbContainer = mLauncher.getQsbContainer();
-            ViewGroup.LayoutParams lp = qsbContainer.getLayoutParams();
-            if (cellHeight > 0 && lp.height != cellHeight) {
-                lp.height = cellHeight;
-                qsbContainer.setLayoutParams(lp);
-            }
-        }
-    }
-
     public void removeAllWorkspaceScreens() {
         // Disable all layout transitions before removing all pages to ensure that we don't get the
         // transition animations competing with us changing the scroll when we add pages or the
@@ -670,7 +626,7 @@ public class Workspace extends PagedView
         }
 
         // Recycle the QSB widget
-        View qsb = findViewById(getEmbeddedQsbId());
+        View qsb = findViewById(R.id.qsb_container);
         if (qsb != null) {
             ((ViewGroup) qsb.getParent()).removeView(qsb);
         }
@@ -1406,17 +1362,9 @@ public class Workspace extends PagedView
         super.scrollTo(x, y);
     }
 
-    private void onWorkspaceOverallScrollChanged() {
-        if (!mIgnoreQsbScroll) {
-            mLauncher.getQsbContainer().setTranslationX(
-                    mOverlayTranslation + mFirstPageScrollX - getScrollX());
-        }
-    }
-
     @Override
     protected void onScrollChanged(int l, int t, int oldl, int oldt) {
         super.onScrollChanged(l, t, oldl, oldt);
-        onWorkspaceOverallScrollChanged();
 
         // Update the page indicator progress.
         boolean isTransitioning = mIsSwitchingState
@@ -1497,9 +1445,6 @@ public class Workspace extends PagedView
         // device I've tried, translating the launcher causes things to get quite laggy.
         setWorkspaceTranslationAndAlpha(Direction.X, transX, alpha);
         setHotseatTranslationAndAlpha(Direction.X, transX, alpha);
-        onWorkspaceOverallScrollChanged();
-
-        mQsbAlphaController.setAlphaAtIndex(alpha, QSB_ALPHA_INDEX_OVERLAY_SCROLL);
     }
 
     /**
@@ -1509,9 +1454,6 @@ public class Workspace extends PagedView
      */
     public void setWorkspaceYTranslationAndAlpha(float translation, float alpha) {
         setWorkspaceTranslationAndAlpha(Direction.Y, translation, alpha);
-
-        mLauncher.getQsbContainer().setTranslationY(translation);
-        mQsbAlphaController.setAlphaAtIndex(alpha, QSB_ALPHA_INDEX_Y_TRANSLATION);
     }
 
     /**
@@ -1707,10 +1649,6 @@ public class Workspace extends PagedView
                     float scrollProgress = getScrollProgress(screenCenter, child, i);
                     float alpha = 1 - Math.abs(scrollProgress);
                     child.getShortcutsAndWidgets().setAlpha(alpha);
-
-                    if (isQsbContainerPage(i)) {
-                        mQsbAlphaController.setAlphaAtIndex(alpha, QSB_ALPHA_INDEX_PAGE_SCROLL);
-                    }
                 }
             }
         }
@@ -1805,7 +1743,6 @@ public class Workspace extends PagedView
         }
         super.onLayout(changed, left, top, right, bottom);
         mFirstPageScrollX = getScrollForPage(0);
-        onWorkspaceOverallScrollChanged();
 
         final LayoutTransition transition = getLayoutTransition();
         // If the transition is running defer updating max scroll, as some empty pages could
@@ -1827,7 +1764,6 @@ public class Workspace extends PagedView
                         mIgnoreQsbScroll = false;
                         transition.removeTransitionListener(this);
                         mFirstPageScrollX = getScrollForPage(0);
-                        onWorkspaceOverallScrollChanged();
                     }
                 }
             });
@@ -2070,10 +2006,6 @@ public class Workspace extends PagedView
             mLauncher.notifyWidgetProvidersChanged();
         }
 
-        if (mOnStateChangeListener != null) {
-            mOnStateChangeListener.prepareStateChange(toState, animated ? workspaceAnim : null);
-        }
-
         onPrepareStateTransition(mState.hasMultipleVisiblePages);
 
         StateTransitionListener listener = new StateTransitionListener();
@@ -4230,20 +4162,6 @@ public class Workspace extends PagedView
         }
     }
 
-    public interface OnStateChangeListener {
-
-        /**
-         * Called when the workspace state is changing.
-         * @param toState final state
-         * @param targetAnim animation which will be played during the transition or null.
-         */
-        void prepareStateChange(State toState, AnimatorSet targetAnim);
-    }
-
-    public static final boolean isQsbContainerPage(int pageNo) {
-        return pageNo == 0;
-    }
-
     private class StateTransitionListener extends AnimatorListenerAdapter
             implements AnimatorUpdateListener {
         @Override
diff --git a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
index 482a2c93b..32deaf286 100644
--- a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
+++ b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
@@ -355,27 +355,10 @@ public class WorkspaceStateTransitionAnimation {
                 cl.setBackgroundAlpha(finalBackgroundAlpha);
                 cl.setShortcutAndWidgetAlpha(finalAlpha);
             }
-
-            if (Workspace.isQsbContainerPage(i) &&
-                    states.stateIsNormal && mWorkspaceFadeInAdjacentScreens) {
-                if (animated) {
-                    Animator anim = mWorkspace.mQsbAlphaController
-                            .animateAlphaAtIndex(finalAlpha, Workspace.QSB_ALPHA_INDEX_PAGE_SCROLL);
-                    anim.setDuration(duration);
-                    anim.setInterpolator(mZoomInInterpolator);
-                    mStateAnimator.play(anim);
-                } else {
-                    mWorkspace.mQsbAlphaController.setAlphaAtIndex(
-                            finalAlpha, Workspace.QSB_ALPHA_INDEX_PAGE_SCROLL);
-                }
-            }
         }
 
         final ViewGroup overviewPanel = mLauncher.getOverviewPanel();
 
-        Animator qsbAlphaAnimation = mWorkspace.mQsbAlphaController
-                .animateAlphaAtIndex(finalQsbAlpha, Workspace.QSB_ALPHA_INDEX_STATE_CHANGE);
-
         if (animated) {
             Animator scale = LauncherAnimUtils.ofPropertyValuesHolder(mWorkspace,
                     new PropertyListBuilder().scale(mNewScale)
@@ -393,7 +376,6 @@ public class WorkspaceStateTransitionAnimation {
             // For animation optimization, we may need to provide the Launcher transition
             // with a set of views on which to force build and manage layers in certain scenarios.
             layerViews.addView(overviewPanel);
-            layerViews.addView(mLauncher.getQsbContainer());
             layerViews.addView(mLauncher.getHotseat());
             layerViews.addView(mWorkspace.getPageIndicator());
 
@@ -407,11 +389,9 @@ public class WorkspaceStateTransitionAnimation {
 
             overviewPanelAlpha.setDuration(duration);
             hotseatAlpha.setDuration(duration);
-            qsbAlphaAnimation.setDuration(duration);
 
             mStateAnimator.play(overviewPanelAlpha);
             mStateAnimator.play(hotseatAlpha);
-            mStateAnimator.play(qsbAlphaAnimation);
             mStateAnimator.addListener(new AnimatorListenerAdapter() {
                 boolean canceled = false;
                 @Override
@@ -439,7 +419,6 @@ public class WorkspaceStateTransitionAnimation {
             AlphaUpdateListener.updateVisibility(overviewPanel, accessibilityEnabled);
             mWorkspace.getPageIndicator().setShouldAutoHide(!states.stateIsSpringLoaded);
 
-            qsbAlphaAnimation.end();
             mWorkspace.createHotseatAlphaAnimator(finalHotseatAlpha).end();
             mWorkspace.updateCustomContentVisibility();
             mWorkspace.setScaleX(mNewScale);
diff --git a/src/com/android/launcher3/qsb/QsbBlockerView.java b/src/com/android/launcher3/qsb/QsbBlockerView.java
deleted file mode 100644
index 5379336de..000000000
--- a/src/com/android/launcher3/qsb/QsbBlockerView.java
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
- * Copyright (C) 2016 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.launcher3.qsb;
-
-import android.animation.AnimatorSet;
-import android.animation.ObjectAnimator;
-import android.animation.ValueAnimator;
-import android.animation.ValueAnimator.AnimatorUpdateListener;
-import android.content.Context;
-import android.graphics.Canvas;
-import android.graphics.Color;
-import android.graphics.Paint;
-import android.util.AttributeSet;
-import android.view.View;
-
-import com.android.launcher3.Launcher;
-import com.android.launcher3.Workspace;
-import com.android.launcher3.Workspace.OnStateChangeListener;
-import com.android.launcher3.Workspace.State;
-
-/**
- * A simple view used to show the region blocked by QSB during drag and drop.
- */
-public class QsbBlockerView extends View implements OnStateChangeListener {
-
-    private static final int VISIBLE_ALPHA = 100;
-
-    private final Paint mBgPaint;
-
-    public QsbBlockerView(Context context, AttributeSet attrs) {
-        super(context, attrs);
-
-        mBgPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
-        mBgPaint.setColor(Color.WHITE);
-        mBgPaint.setAlpha(0);
-    }
-
-    @Override
-    protected void onAttachedToWindow() {
-        super.onAttachedToWindow();
-
-        Workspace w = Launcher.getLauncher(getContext()).getWorkspace();
-        w.setOnStateChangeListener(this);
-        prepareStateChange(w.getState(), null);
-    }
-
-    @Override
-    public void prepareStateChange(State toState, AnimatorSet targetAnim) {
-        int finalAlpha = getAlphaForState(toState);
-        if (targetAnim == null) {
-            mBgPaint.setAlpha(finalAlpha);
-            invalidate();
-        } else {
-            ObjectAnimator anim = ObjectAnimator.ofArgb(mBgPaint, "alpha", finalAlpha);
-            anim.addUpdateListener(new AnimatorUpdateListener() {
-                @Override
-                public void onAnimationUpdate(ValueAnimator valueAnimator) {
-                    invalidate();
-                }
-            });
-            targetAnim.play(anim);
-        }
-    }
-
-    private static int getAlphaForState(State state) {
-        switch (state) {
-            case SPRING_LOADED:
-            case OVERVIEW:
-            case OVERVIEW_HIDDEN:
-                return VISIBLE_ALPHA;
-        }
-        return 0;
-    }
-
-    @Override
-    protected void onDraw(Canvas canvas) {
-        canvas.drawPaint(mBgPaint);
-    }
-}
diff --git a/src/com/android/launcher3/util/MultiStateAlphaController.java b/src/com/android/launcher3/util/MultiStateAlphaController.java
deleted file mode 100644
index 956fc9eba..000000000
--- a/src/com/android/launcher3/util/MultiStateAlphaController.java
+++ /dev/null
@@ -1,119 +0,0 @@
-/*
- * Copyright (C) 2016 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.launcher3.util;
-
-import android.animation.Animator;
-import android.animation.AnimatorListenerAdapter;
-import android.animation.ValueAnimator;
-import android.animation.ValueAnimator.AnimatorUpdateListener;
-import android.content.Context;
-import android.view.View;
-import android.view.accessibility.AccessibilityManager;
-
-import java.util.Arrays;
-
-/**
- * A utility class which divides the alpha for a view across multiple states.
- */
-public class MultiStateAlphaController {
-
-    private final View mTargetView;
-    private final float[] mAlphas;
-    private final AccessibilityManager mAm;
-    private int mZeroAlphaListenerCount = 0;
-
-    public MultiStateAlphaController(View view, int stateCount) {
-        mTargetView = view;
-        mAlphas = new float[stateCount];
-        Arrays.fill(mAlphas, 1);
-
-        mAm = (AccessibilityManager) view.getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
-    }
-
-    public void setAlphaAtIndex(float alpha, int index) {
-        mAlphas[index] = alpha;
-        updateAlpha();
-    }
-
-    private void updateAlpha() {
-        // Only update the alpha if no zero-alpha animation is running.
-        if (mZeroAlphaListenerCount > 0) {
-            return;
-        }
-        float finalAlpha = 1;
-        for (float a : mAlphas) {
-            finalAlpha = finalAlpha * a;
-        }
-        mTargetView.setAlpha(finalAlpha);
-        mTargetView.setVisibility(finalAlpha > 0 ? View.VISIBLE
-                : (mAm.isEnabled() ? View.GONE : View.INVISIBLE));
-    }
-
-    /**
-     * Returns an animator which changes the alpha at the index {@param index}
-     * to {@param finalAlpha}. Alphas at other index are not affected.
-     */
-    public Animator animateAlphaAtIndex(float finalAlpha, final int index) {
-        final ValueAnimator anim;
-
-        if (Float.compare(finalAlpha, mAlphas[index]) == 0) {
-            // Return a dummy animator to avoid null checks.
-            anim = ValueAnimator.ofFloat(0, 0);
-        } else {
-            ValueAnimator animator = ValueAnimator.ofFloat(mAlphas[index], finalAlpha);
-            animator.addUpdateListener(new AnimatorUpdateListener() {
-                @Override
-                public void onAnimationUpdate(ValueAnimator valueAnimator) {
-                    float value = (Float) valueAnimator.getAnimatedValue();
-                    setAlphaAtIndex(value, index);
-                }
-            });
-            anim = animator;
-        }
-
-        if (Float.compare(finalAlpha, 0f) == 0) {
-            // In case when any channel is animating to 0, and the current alpha is also 0, do not
-            // update alpha of the target view while the animation is running.
-            // We special case '0' because if any channel is set to 0, values of other
-            // channels do not matter.
-            anim.addListener(new ZeroAlphaAnimatorListener());
-        }
-        return anim;
-    }
-
-    private class ZeroAlphaAnimatorListener extends AnimatorListenerAdapter {
-
-        private boolean mStartedAtZero = false;
-
-        @Override
-        public void onAnimationStart(Animator animation) {
-            mStartedAtZero = Float.compare(mTargetView.getAlpha(), 0f) == 0;
-            if (mStartedAtZero) {
-                mZeroAlphaListenerCount++;
-                mTargetView.setAlpha(0);
-            }
-        }
-
-        @Override
-        public void onAnimationEnd(Animator animation) {
-            if (mStartedAtZero) {
-                mZeroAlphaListenerCount--;
-                updateAlpha();
-            }
-        }
-    }
-}