v17/leanback/src/android/support/v17/leanback/app/RowsSupportFragment.java - platform/frameworks/support - Git at Google

 /* This file is auto-generated from RowsFragment.java.  DO NOT MODIFY. */

 /*
  * Copyright (C) 2014 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 android.support.v17.leanback.app;

 import android.animation.TimeAnimator;
 import android.animation.TimeAnimator.TimeListener;
 import android.os.Bundle;
 import android.support.v17.leanback.R;
 import android.support.v17.leanback.widget.HorizontalGridView;
 import android.support.v17.leanback.widget.ItemBridgeAdapter;
 import android.support.v17.leanback.widget.ListRowPresenter;
 import android.support.v17.leanback.widget.ObjectAdapter;
 import android.support.v17.leanback.widget.BaseOnItemViewClickedListener;
 import android.support.v17.leanback.widget.BaseOnItemViewSelectedListener;
 import android.support.v17.leanback.widget.OnItemViewClickedListener;
 import android.support.v17.leanback.widget.OnItemViewSelectedListener;
 import android.support.v17.leanback.widget.Presenter;
 import android.support.v17.leanback.widget.PresenterSelector;
 import android.support.v17.leanback.widget.RowPresenter;
 import android.support.v17.leanback.widget.VerticalGridView;
 import android.support.v17.leanback.widget.ViewHolderTask;
 import android.support.v7.widget.RecyclerView;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.animation.DecelerateInterpolator;
 import android.view.animation.Interpolator;

 import java.util.ArrayList;

 /**
  * An ordered set of rows of leanback widgets.
  * <p>
  * A RowsSupportFragment renders the elements of its
  * {@link android.support.v17.leanback.widget.ObjectAdapter} as a set
  * of rows in a vertical list. The Adapter's {@link PresenterSelector} must maintain subclasses
  * of {@link RowPresenter}.
  * </p>
  */
 public class RowsSupportFragment extends BaseRowSupportFragment implements
         BrowseSupportFragment.MainFragmentRowsAdapterProvider,
         BrowseSupportFragment.MainFragmentAdapterProvider {

     private MainFragmentAdapter mMainFragmentAdapter;
     private MainFragmentRowsAdapter mMainFragmentRowsAdapter;

     @Override
     public BrowseSupportFragment.MainFragmentAdapter getMainFragmentAdapter() {
         if (mMainFragmentAdapter == null) {
             mMainFragmentAdapter = new MainFragmentAdapter(this);
         }
         return mMainFragmentAdapter;
     }

     @Override
     public BrowseSupportFragment.MainFragmentRowsAdapter getMainFragmentRowsAdapter() {
         if (mMainFragmentRowsAdapter == null) {
             mMainFragmentRowsAdapter = new MainFragmentRowsAdapter(this);
         }
         return mMainFragmentRowsAdapter;
     }

     /**
      * Internal helper class that manages row select animation and apply a default
      * dim to each row.
      */
     final class RowViewHolderExtra implements TimeListener {
         final RowPresenter mRowPresenter;
         final Presenter.ViewHolder mRowViewHolder;

         final TimeAnimator mSelectAnimator = new TimeAnimator();

         int mSelectAnimatorDurationInUse;
         Interpolator mSelectAnimatorInterpolatorInUse;
         float mSelectLevelAnimStart;
         float mSelectLevelAnimDelta;

         RowViewHolderExtra(ItemBridgeAdapter.ViewHolder ibvh) {
             mRowPresenter = (RowPresenter) ibvh.getPresenter();
             mRowViewHolder = ibvh.getViewHolder();
             mSelectAnimator.setTimeListener(this);
         }

         @Override
         public void onTimeUpdate(TimeAnimator animation, long totalTime, long deltaTime) {
             if (mSelectAnimator.isRunning()) {
                 updateSelect(totalTime, deltaTime);
             }
         }

         void updateSelect(long totalTime, long deltaTime) {
             float fraction;
             if (totalTime >= mSelectAnimatorDurationInUse) {
                 fraction = 1;
                 mSelectAnimator.end();
             } else {
                 fraction = (float) (totalTime / (double) mSelectAnimatorDurationInUse);
             }
             if (mSelectAnimatorInterpolatorInUse != null) {
                 fraction = mSelectAnimatorInterpolatorInUse.getInterpolation(fraction);
             }
             float level = mSelectLevelAnimStart + fraction * mSelectLevelAnimDelta;
             mRowPresenter.setSelectLevel(mRowViewHolder, level);
         }

         void animateSelect(boolean select, boolean immediate) {
             mSelectAnimator.end();
             final float end = select ? 1 : 0;
             if (immediate) {
                 mRowPresenter.setSelectLevel(mRowViewHolder, end);
             } else if (mRowPresenter.getSelectLevel(mRowViewHolder) != end) {
                 mSelectAnimatorDurationInUse = mSelectAnimatorDuration;
                 mSelectAnimatorInterpolatorInUse = mSelectAnimatorInterpolator;
                 mSelectLevelAnimStart = mRowPresenter.getSelectLevel(mRowViewHolder);
                 mSelectLevelAnimDelta = end - mSelectLevelAnimStart;
                 mSelectAnimator.start();
             }
         }

     }

     private static final String TAG = "RowsSupportFragment";
     private static final boolean DEBUG = false;

     private ItemBridgeAdapter.ViewHolder mSelectedViewHolder;
     private int mSubPosition;
     private boolean mExpand = true;
     private boolean mViewsCreated;
     private int mAlignedTop;
     private boolean mAfterEntranceTransition = true;

     private BaseOnItemViewSelectedListener mOnItemViewSelectedListener;
     private BaseOnItemViewClickedListener mOnItemViewClickedListener;

     // Select animation and interpolator are not intended to be
     // exposed at this moment. They might be synced with vertical scroll
     // animation later.
     int mSelectAnimatorDuration;
     Interpolator mSelectAnimatorInterpolator = new DecelerateInterpolator(2);

     private RecyclerView.RecycledViewPool mRecycledViewPool;
     private ArrayList<Presenter> mPresenterMapper;

     private ItemBridgeAdapter.AdapterListener mExternalAdapterListener;

     @Override
     protected VerticalGridView findGridViewFromRoot(View view) {
         return (VerticalGridView) view.findViewById(R.id.container_list);
     }

     /**
      * Sets an item clicked listener on the fragment.
      * OnItemViewClickedListener will override {@link View.OnClickListener} that
      * item presenter sets during {@link Presenter#onCreateViewHolder(ViewGroup)}.
      * So in general, developer should choose one of the listeners but not both.
      */
     public void setOnItemViewClickedListener(BaseOnItemViewClickedListener listener) {
         mOnItemViewClickedListener = listener;
         if (mViewsCreated) {
             throw new IllegalStateException(
                     "Item clicked listener must be set before views are created");
         }
     }

     /**
      * Returns the item clicked listener.
      */
     public BaseOnItemViewClickedListener getOnItemViewClickedListener() {
         return mOnItemViewClickedListener;
     }

     /**
      * @deprecated use {@link BrowseSupportFragment#enableRowScaling(boolean)} instead.
      *
      * @param enable true to enable row scaling
      */
     @Deprecated
     public void enableRowScaling(boolean enable) {
     }

     /**
      * Set the visibility of titles/hovercard of browse rows.
      */
     public void setExpand(boolean expand) {
         mExpand = expand;
         VerticalGridView listView = getVerticalGridView();
         if (listView != null) {
             final int count = listView.getChildCount();
             if (DEBUG) Log.v(TAG, "setExpand " + expand + " count " + count);
             for (int i = 0; i < count; i++) {
                 View view = listView.getChildAt(i);
                 ItemBridgeAdapter.ViewHolder vh
                         = (ItemBridgeAdapter.ViewHolder) listView.getChildViewHolder(view);
                 setRowViewExpanded(vh, mExpand);
             }
         }
     }

     /**
      * Sets an item selection listener.
      */
     public void setOnItemViewSelectedListener(BaseOnItemViewSelectedListener listener) {
         mOnItemViewSelectedListener = listener;
         VerticalGridView listView = getVerticalGridView();
         if (listView != null) {
             final int count = listView.getChildCount();
             for (int i = 0; i < count; i++) {
                 View view = listView.getChildAt(i);
                 ItemBridgeAdapter.ViewHolder ibvh = (ItemBridgeAdapter.ViewHolder)
                         listView.getChildViewHolder(view);
                 getRowViewHolder(ibvh).setOnItemViewSelectedListener(mOnItemViewSelectedListener);
             }
         }
     }

     /**
      * Returns an item selection listener.
      */
     public BaseOnItemViewSelectedListener getOnItemViewSelectedListener() {
         return mOnItemViewSelectedListener;
     }

     @Override
     void onRowSelected(RecyclerView parent, RecyclerView.ViewHolder viewHolder,
             int position, int subposition) {
         if (mSelectedViewHolder != viewHolder || mSubPosition != subposition) {
             if (DEBUG) Log.v(TAG, "new row selected position " + position + " subposition "
                     + subposition + " view " + viewHolder.itemView);
             mSubPosition = subposition;
             if (mSelectedViewHolder != null) {
                 setRowViewSelected(mSelectedViewHolder, false, false);
             }
             mSelectedViewHolder = (ItemBridgeAdapter.ViewHolder) viewHolder;
             if (mSelectedViewHolder != null) {
                 setRowViewSelected(mSelectedViewHolder, true, false);
             }
         }
         // When RowsSupportFragment is embedded inside a page fragment, we want to show
         // the title view only when we're on the first row or there is no data.
         if (mMainFragmentAdapter != null) {
             mMainFragmentAdapter.getFragmentHost().showTitleView(position <= 0);
         }
     }

     /**
      * Get row ViewHolder at adapter position.  Returns null if the row object is not in adapter or
      * the row object has not been bound to a row view.
      *
      * @param position Position of row in adapter.
      * @return Row ViewHolder at a given adapter position.
      */
     public RowPresenter.ViewHolder getRowViewHolder(int position) {
         VerticalGridView verticalView = getVerticalGridView();
         if (verticalView == null) {
             return null;
         }
         return getRowViewHolder((ItemBridgeAdapter.ViewHolder)
                 verticalView.findViewHolderForAdapterPosition(position));
     }

     @Override
     int getLayoutResourceId() {
         return R.layout.lb_rows_fragment;
     }

     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         mSelectAnimatorDuration = getResources().getInteger(
                 R.integer.lb_browse_rows_anim_duration);
     }

     @Override
     public void onViewCreated(View view, Bundle savedInstanceState) {
         if (DEBUG) Log.v(TAG, "onViewCreated");
         super.onViewCreated(view, savedInstanceState);
         // Align the top edge of child with id row_content.
         // Need set this for directly using RowsSupportFragment.
         getVerticalGridView().setItemAlignmentViewId(R.id.row_content);
         getVerticalGridView().setSaveChildrenPolicy(VerticalGridView.SAVE_LIMITED_CHILD);

         setAlignment(mAlignedTop);

         mRecycledViewPool = null;
         mPresenterMapper = null;
         if (mMainFragmentAdapter != null) {
             mMainFragmentAdapter.getFragmentHost().notifyViewCreated(mMainFragmentAdapter);
         }

     }

     @Override
     public void onDestroyView() {
         mViewsCreated = false;
         super.onDestroyView();
     }

     void setExternalAdapterListener(ItemBridgeAdapter.AdapterListener listener) {
         mExternalAdapterListener = listener;
     }

     private static void setRowViewExpanded(ItemBridgeAdapter.ViewHolder vh, boolean expanded) {
         ((RowPresenter) vh.getPresenter()).setRowViewExpanded(vh.getViewHolder(), expanded);
     }

     private static void setRowViewSelected(ItemBridgeAdapter.ViewHolder vh, boolean selected,
             boolean immediate) {
         RowViewHolderExtra extra = (RowViewHolderExtra) vh.getExtraObject();
         extra.animateSelect(selected, immediate);
         ((RowPresenter) vh.getPresenter()).setRowViewSelected(vh.getViewHolder(), selected);
     }

     private final ItemBridgeAdapter.AdapterListener mBridgeAdapterListener =
             new ItemBridgeAdapter.AdapterListener() {
         @Override
         public void onAddPresenter(Presenter presenter, int type) {
             if (mExternalAdapterListener != null) {
                 mExternalAdapterListener.onAddPresenter(presenter, type);
             }
         }

         @Override
         public void onCreate(ItemBridgeAdapter.ViewHolder vh) {
             VerticalGridView listView = getVerticalGridView();
             if (listView != null) {
                 // set clip children false for slide animation
                 listView.setClipChildren(false);
             }
             setupSharedViewPool(vh);
             mViewsCreated = true;
             vh.setExtraObject(new RowViewHolderExtra(vh));
             // selected state is initialized to false, then driven by grid view onChildSelected
             // events.  When there is rebind, grid view fires onChildSelected event properly.
             // So we don't need do anything special later in onBind or onAttachedToWindow.
             setRowViewSelected(vh, false, true);
             if (mExternalAdapterListener != null) {
                 mExternalAdapterListener.onCreate(vh);
             }
         }

         @Override
         public void onAttachedToWindow(ItemBridgeAdapter.ViewHolder vh) {
             if (DEBUG) Log.v(TAG, "onAttachToWindow");
             // All views share the same mExpand value.  When we attach a view to grid view,
             // we should make sure it pick up the latest mExpand value we set early on other
             // attached views.  For no-structure-change update,  the view is rebound to new data,
             // but again it should use the unchanged mExpand value,  so we don't need do any
             // thing in onBind.
             setRowViewExpanded(vh, mExpand);
             RowPresenter rowPresenter = (RowPresenter) vh.getPresenter();
             RowPresenter.ViewHolder rowVh = rowPresenter.getRowViewHolder(vh.getViewHolder());
             rowVh.setOnItemViewSelectedListener(mOnItemViewSelectedListener);
             rowVh.setOnItemViewClickedListener(mOnItemViewClickedListener);
             rowPresenter.setEntranceTransitionState(rowVh, mAfterEntranceTransition);
             if (mExternalAdapterListener != null) {
                 mExternalAdapterListener.onAttachedToWindow(vh);
             }
         }

         @Override
         public void onDetachedFromWindow(ItemBridgeAdapter.ViewHolder vh) {
             if (mSelectedViewHolder == vh) {
                 setRowViewSelected(mSelectedViewHolder, false, true);
                 mSelectedViewHolder = null;
             }
             if (mExternalAdapterListener != null) {
                 mExternalAdapterListener.onDetachedFromWindow(vh);
             }
         }

         @Override
         public void onBind(ItemBridgeAdapter.ViewHolder vh) {
             if (mExternalAdapterListener != null) {
                 mExternalAdapterListener.onBind(vh);
             }
         }

         @Override
         public void onUnbind(ItemBridgeAdapter.ViewHolder vh) {
             setRowViewSelected(vh, false, true);
             if (mExternalAdapterListener != null) {
                 mExternalAdapterListener.onUnbind(vh);
             }
         }
     };

     private void setupSharedViewPool(ItemBridgeAdapter.ViewHolder bridgeVh) {
         RowPresenter rowPresenter = (RowPresenter) bridgeVh.getPresenter();
         RowPresenter.ViewHolder rowVh = rowPresenter.getRowViewHolder(bridgeVh.getViewHolder());

         if (rowVh instanceof ListRowPresenter.ViewHolder) {
             HorizontalGridView view = ((ListRowPresenter.ViewHolder) rowVh).getGridView();
             // Recycled view pool is shared between all list rows
             if (mRecycledViewPool == null) {
                 mRecycledViewPool = view.getRecycledViewPool();
             } else {
                 view.setRecycledViewPool(mRecycledViewPool);
             }

             ItemBridgeAdapter bridgeAdapter =
                     ((ListRowPresenter.ViewHolder) rowVh).getBridgeAdapter();
             if (mPresenterMapper == null) {
                 mPresenterMapper = bridgeAdapter.getPresenterMapper();
             } else {
                 bridgeAdapter.setPresenterMapper(mPresenterMapper);
             }
         }
     }

     @Override
     void updateAdapter() {
         super.updateAdapter();
         mSelectedViewHolder = null;
         mViewsCreated = false;

         ItemBridgeAdapter adapter = getBridgeAdapter();
         if (adapter != null) {
             adapter.setAdapterListener(mBridgeAdapterListener);
         }
     }

     @Override
     public boolean onTransitionPrepare() {
         boolean prepared = super.onTransitionPrepare();
         if (prepared) {
             freezeRows(true);
         }
         return prepared;
     }

     @Override
     public void onTransitionEnd() {
         super.onTransitionEnd();
         freezeRows(false);
     }

     private void freezeRows(boolean freeze) {
         VerticalGridView verticalView = getVerticalGridView();
         if (verticalView != null) {
             final int count = verticalView.getChildCount();
             for (int i = 0; i < count; i++) {
                 ItemBridgeAdapter.ViewHolder ibvh = (ItemBridgeAdapter.ViewHolder)
                         verticalView.getChildViewHolder(verticalView.getChildAt(i));
                 RowPresenter rowPresenter = (RowPresenter) ibvh.getPresenter();
                 RowPresenter.ViewHolder vh = rowPresenter.getRowViewHolder(ibvh.getViewHolder());
                 rowPresenter.freeze(vh, freeze);
             }
         }
     }

     /**
      * For rows that willing to participate entrance transition,  this function
      * hide views if afterTransition is true,  show views if afterTransition is false.
      */
     public void setEntranceTransitionState(boolean afterTransition) {
         mAfterEntranceTransition = afterTransition;
         VerticalGridView verticalView = getVerticalGridView();
         if (verticalView != null) {
             final int count = verticalView.getChildCount();
             for (int i = 0; i < count; i++) {
                 ItemBridgeAdapter.ViewHolder ibvh = (ItemBridgeAdapter.ViewHolder)
                         verticalView.getChildViewHolder(verticalView.getChildAt(i));
                 RowPresenter rowPresenter = (RowPresenter) ibvh.getPresenter();
                 RowPresenter.ViewHolder vh = rowPresenter.getRowViewHolder(ibvh.getViewHolder());
                 rowPresenter.setEntranceTransitionState(vh, mAfterEntranceTransition);
             }
         }
     }

     /**
      * Selects a Row and perform an optional task on the Row. For example
      * <code>setSelectedPosition(10, true, new ListRowPresenterSelectItemViewHolderTask(5))</code>
      * Scroll to 11th row and selects 6th item on that row.  The method will be ignored if
      * RowsSupportFragment has not been created (i.e. before {@link #onCreateView(LayoutInflater,
      * ViewGroup, Bundle)}).
      *
      * @param rowPosition Which row to select.
      * @param smooth True to scroll to the row, false for no animation.
      * @param rowHolderTask Task to perform on the Row.
      */
     public void setSelectedPosition(int rowPosition, boolean smooth,
             final Presenter.ViewHolderTask rowHolderTask) {
         VerticalGridView verticalView = getVerticalGridView();
         if (verticalView == null) {
             return;
         }
         ViewHolderTask task = null;
         if (rowHolderTask != null) {
             // This task will execute once the scroll completes. Once the scrolling finishes,
             // we will get a success callback to update selected row position. Since the
             // update to selected row position happens in a post, we want to ensure that this
             // gets called after that.
             task = new ViewHolderTask() {
                 @Override
                 public void run(final RecyclerView.ViewHolder rvh) {
                     rvh.itemView.post(new Runnable() {
                         @Override
                         public void run() {
                             rowHolderTask.run(
                                     getRowViewHolder((ItemBridgeAdapter.ViewHolder) rvh));
                         }
                     });
                 }
             };
         }

         if (smooth) {
             verticalView.setSelectedPositionSmooth(rowPosition, task);
         } else {
             verticalView.setSelectedPosition(rowPosition, task);
         }
     }

     static RowPresenter.ViewHolder getRowViewHolder(ItemBridgeAdapter.ViewHolder ibvh) {
         if (ibvh == null) {
             return null;
         }
         RowPresenter rowPresenter = (RowPresenter) ibvh.getPresenter();
         return rowPresenter.getRowViewHolder(ibvh.getViewHolder());
     }

     public boolean isScrolling() {
         if (getVerticalGridView() == null) {
             return false;
         }
         return getVerticalGridView().getScrollState() != HorizontalGridView.SCROLL_STATE_IDLE;
     }

     @Override
     public void setAlignment(int windowAlignOffsetFromTop) {
         mAlignedTop = windowAlignOffsetFromTop;
         final VerticalGridView gridView = getVerticalGridView();

         if (gridView != null) {
             gridView.setItemAlignmentOffset(0);
             gridView.setItemAlignmentOffsetPercent(
                     VerticalGridView.ITEM_ALIGN_OFFSET_PERCENT_DISABLED);
             gridView.setItemAlignmentOffsetWithPadding(true);
             gridView.setWindowAlignmentOffset(mAlignedTop);
             // align to a fixed position from top
             gridView.setWindowAlignmentOffsetPercent(
                     VerticalGridView.WINDOW_ALIGN_OFFSET_PERCENT_DISABLED);
             gridView.setWindowAlignment(VerticalGridView.WINDOW_ALIGN_NO_EDGE);
         }
     }

     public static class MainFragmentAdapter extends BrowseSupportFragment.MainFragmentAdapter<RowsSupportFragment> {

         public MainFragmentAdapter(RowsSupportFragment fragment) {
             super(fragment);
             setScalingEnabled(true);
         }

         @Override
         public boolean isScrolling() {
             return getFragment().isScrolling();
         }

         @Override
         public void setExpand(boolean expand) {
             getFragment().setExpand(expand);
         }

         @Override
         public void setEntranceTransitionState(boolean state) {
             getFragment().setEntranceTransitionState(state);
         }

         @Override
         public void setAlignment(int windowAlignOffsetFromTop) {
             getFragment().setAlignment(windowAlignOffsetFromTop);
         }

         @Override
         public boolean onTransitionPrepare() {
             return getFragment().onTransitionPrepare();
         }

         @Override
         public void onTransitionStart() {
             getFragment().onTransitionStart();
         }

         @Override
         public void onTransitionEnd() {
             getFragment().onTransitionEnd();
         }

     }

     public static class MainFragmentRowsAdapter
             extends BrowseSupportFragment.MainFragmentRowsAdapter<RowsSupportFragment> {

         public MainFragmentRowsAdapter(RowsSupportFragment fragment) {
             super(fragment);
         }

         @Override
         public void setAdapter(ObjectAdapter adapter) {
             getFragment().setAdapter(adapter);
         }

         /**
          * Sets an item clicked listener on the fragment.
          */
         @Override
         public void setOnItemViewClickedListener(OnItemViewClickedListener listener) {
             getFragment().setOnItemViewClickedListener(listener);
         }

         @Override
         public void setOnItemViewSelectedListener(OnItemViewSelectedListener listener) {
             getFragment().setOnItemViewSelectedListener(listener);
         }

         @Override
         public void setSelectedPosition(int rowPosition,
                                         boolean smooth,
                                         final Presenter.ViewHolderTask rowHolderTask) {
             getFragment().setSelectedPosition(rowPosition, smooth, rowHolderTask);
         }

         @Override
         public void setSelectedPosition(int rowPosition, boolean smooth) {
             getFragment().setSelectedPosition(rowPosition, smooth);
         }

         @Override
         public int getSelectedPosition() {
             return getFragment().getSelectedPosition();
         }
     }
 }
	/* This file is auto-generated from RowsFragment.java. DO NOT MODIFY. */

	/*
	* Copyright (C) 2014 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 android.support.v17.leanback.app;

	import android.animation.TimeAnimator;
	import android.animation.TimeAnimator.TimeListener;
	import android.os.Bundle;
	import android.support.v17.leanback.R;
	import android.support.v17.leanback.widget.HorizontalGridView;
	import android.support.v17.leanback.widget.ItemBridgeAdapter;
	import android.support.v17.leanback.widget.ListRowPresenter;
	import android.support.v17.leanback.widget.ObjectAdapter;
	import android.support.v17.leanback.widget.BaseOnItemViewClickedListener;
	import android.support.v17.leanback.widget.BaseOnItemViewSelectedListener;
	import android.support.v17.leanback.widget.OnItemViewClickedListener;
	import android.support.v17.leanback.widget.OnItemViewSelectedListener;
	import android.support.v17.leanback.widget.Presenter;
	import android.support.v17.leanback.widget.PresenterSelector;
	import android.support.v17.leanback.widget.RowPresenter;
	import android.support.v17.leanback.widget.VerticalGridView;
	import android.support.v17.leanback.widget.ViewHolderTask;
	import android.support.v7.widget.RecyclerView;
	import android.util.Log;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.view.animation.DecelerateInterpolator;
	import android.view.animation.Interpolator;

	import java.util.ArrayList;

	/**
	* An ordered set of rows of leanback widgets.
	* <p>
	* A RowsSupportFragment renders the elements of its
	* {@link android.support.v17.leanback.widget.ObjectAdapter} as a set
	* of rows in a vertical list. The Adapter's {@link PresenterSelector} must maintain subclasses
	* of {@link RowPresenter}.
	* </p>
	*/
	public class RowsSupportFragment extends BaseRowSupportFragment implements
	BrowseSupportFragment.MainFragmentRowsAdapterProvider,
	BrowseSupportFragment.MainFragmentAdapterProvider {

	private MainFragmentAdapter mMainFragmentAdapter;
	private MainFragmentRowsAdapter mMainFragmentRowsAdapter;

	@Override
	public BrowseSupportFragment.MainFragmentAdapter getMainFragmentAdapter() {
	if (mMainFragmentAdapter == null) {
	mMainFragmentAdapter = new MainFragmentAdapter(this);
	}
	return mMainFragmentAdapter;
	}

	@Override
	public BrowseSupportFragment.MainFragmentRowsAdapter getMainFragmentRowsAdapter() {
	if (mMainFragmentRowsAdapter == null) {
	mMainFragmentRowsAdapter = new MainFragmentRowsAdapter(this);
	}
	return mMainFragmentRowsAdapter;
	}

	/**
	* Internal helper class that manages row select animation and apply a default
	* dim to each row.
	*/
	final class RowViewHolderExtra implements TimeListener {
	final RowPresenter mRowPresenter;
	final Presenter.ViewHolder mRowViewHolder;

	final TimeAnimator mSelectAnimator = new TimeAnimator();

	int mSelectAnimatorDurationInUse;
	Interpolator mSelectAnimatorInterpolatorInUse;
	float mSelectLevelAnimStart;
	float mSelectLevelAnimDelta;

	RowViewHolderExtra(ItemBridgeAdapter.ViewHolder ibvh) {
	mRowPresenter = (RowPresenter) ibvh.getPresenter();
	mRowViewHolder = ibvh.getViewHolder();
	mSelectAnimator.setTimeListener(this);
	}

	@Override
	public void onTimeUpdate(TimeAnimator animation, long totalTime, long deltaTime) {
	if (mSelectAnimator.isRunning()) {
	updateSelect(totalTime, deltaTime);
	}
	}

	void updateSelect(long totalTime, long deltaTime) {
	float fraction;
	if (totalTime >= mSelectAnimatorDurationInUse) {
	fraction = 1;
	mSelectAnimator.end();
	} else {
	fraction = (float) (totalTime / (double) mSelectAnimatorDurationInUse);
	}
	if (mSelectAnimatorInterpolatorInUse != null) {
	fraction = mSelectAnimatorInterpolatorInUse.getInterpolation(fraction);
	}
	float level = mSelectLevelAnimStart + fraction * mSelectLevelAnimDelta;
	mRowPresenter.setSelectLevel(mRowViewHolder, level);
	}

	void animateSelect(boolean select, boolean immediate) {
	mSelectAnimator.end();
	final float end = select ? 1 : 0;
	if (immediate) {
	mRowPresenter.setSelectLevel(mRowViewHolder, end);
	} else if (mRowPresenter.getSelectLevel(mRowViewHolder) != end) {
	mSelectAnimatorDurationInUse = mSelectAnimatorDuration;
	mSelectAnimatorInterpolatorInUse = mSelectAnimatorInterpolator;
	mSelectLevelAnimStart = mRowPresenter.getSelectLevel(mRowViewHolder);
	mSelectLevelAnimDelta = end - mSelectLevelAnimStart;
	mSelectAnimator.start();
	}
	}

	}

	private static final String TAG = "RowsSupportFragment";
	private static final boolean DEBUG = false;

	private ItemBridgeAdapter.ViewHolder mSelectedViewHolder;
	private int mSubPosition;
	private boolean mExpand = true;
	private boolean mViewsCreated;
	private int mAlignedTop;
	private boolean mAfterEntranceTransition = true;

	private BaseOnItemViewSelectedListener mOnItemViewSelectedListener;
	private BaseOnItemViewClickedListener mOnItemViewClickedListener;

	// Select animation and interpolator are not intended to be
	// exposed at this moment. They might be synced with vertical scroll
	// animation later.
	int mSelectAnimatorDuration;
	Interpolator mSelectAnimatorInterpolator = new DecelerateInterpolator(2);

	private RecyclerView.RecycledViewPool mRecycledViewPool;
	private ArrayList<Presenter> mPresenterMapper;

	private ItemBridgeAdapter.AdapterListener mExternalAdapterListener;

	@Override
	protected VerticalGridView findGridViewFromRoot(View view) {
	return (VerticalGridView) view.findViewById(R.id.container_list);
	}

	/**
	* Sets an item clicked listener on the fragment.
	* OnItemViewClickedListener will override {@link View.OnClickListener} that
	* item presenter sets during {@link Presenter#onCreateViewHolder(ViewGroup)}.
	* So in general, developer should choose one of the listeners but not both.
	*/
	public void setOnItemViewClickedListener(BaseOnItemViewClickedListener listener) {
	mOnItemViewClickedListener = listener;
	if (mViewsCreated) {
	throw new IllegalStateException(
	"Item clicked listener must be set before views are created");
	}
	}

	/**
	* Returns the item clicked listener.
	*/
	public BaseOnItemViewClickedListener getOnItemViewClickedListener() {
	return mOnItemViewClickedListener;
	}

	/**
	* @deprecated use {@link BrowseSupportFragment#enableRowScaling(boolean)} instead.
	*
	* @param enable true to enable row scaling
	*/
	@Deprecated
	public void enableRowScaling(boolean enable) {
	}

	/**
	* Set the visibility of titles/hovercard of browse rows.
	*/
	public void setExpand(boolean expand) {
	mExpand = expand;
	VerticalGridView listView = getVerticalGridView();
	if (listView != null) {
	final int count = listView.getChildCount();
	if (DEBUG) Log.v(TAG, "setExpand " + expand + " count " + count);
	for (int i = 0; i < count; i++) {
	View view = listView.getChildAt(i);
	ItemBridgeAdapter.ViewHolder vh
	= (ItemBridgeAdapter.ViewHolder) listView.getChildViewHolder(view);
	setRowViewExpanded(vh, mExpand);
	}
	}
	}

	/**
	* Sets an item selection listener.
	*/
	public void setOnItemViewSelectedListener(BaseOnItemViewSelectedListener listener) {
	mOnItemViewSelectedListener = listener;
	VerticalGridView listView = getVerticalGridView();
	if (listView != null) {
	final int count = listView.getChildCount();
	for (int i = 0; i < count; i++) {
	View view = listView.getChildAt(i);
	ItemBridgeAdapter.ViewHolder ibvh = (ItemBridgeAdapter.ViewHolder)
	listView.getChildViewHolder(view);
	getRowViewHolder(ibvh).setOnItemViewSelectedListener(mOnItemViewSelectedListener);
	}
	}
	}

	/**
	* Returns an item selection listener.
	*/
	public BaseOnItemViewSelectedListener getOnItemViewSelectedListener() {
	return mOnItemViewSelectedListener;
	}

	@Override
	void onRowSelected(RecyclerView parent, RecyclerView.ViewHolder viewHolder,
	int position, int subposition) {
	if (mSelectedViewHolder != viewHolder \|\| mSubPosition != subposition) {
	if (DEBUG) Log.v(TAG, "new row selected position " + position + " subposition "
	+ subposition + " view " + viewHolder.itemView);
	mSubPosition = subposition;
	if (mSelectedViewHolder != null) {
	setRowViewSelected(mSelectedViewHolder, false, false);
	}
	mSelectedViewHolder = (ItemBridgeAdapter.ViewHolder) viewHolder;
	if (mSelectedViewHolder != null) {
	setRowViewSelected(mSelectedViewHolder, true, false);
	}
	}
	// When RowsSupportFragment is embedded inside a page fragment, we want to show
	// the title view only when we're on the first row or there is no data.
	if (mMainFragmentAdapter != null) {
	mMainFragmentAdapter.getFragmentHost().showTitleView(position <= 0);
	}
	}

	/**
	* Get row ViewHolder at adapter position. Returns null if the row object is not in adapter or
	* the row object has not been bound to a row view.
	*
	* @param position Position of row in adapter.
	* @return Row ViewHolder at a given adapter position.
	*/
	public RowPresenter.ViewHolder getRowViewHolder(int position) {
	VerticalGridView verticalView = getVerticalGridView();
	if (verticalView == null) {
	return null;
	}
	return getRowViewHolder((ItemBridgeAdapter.ViewHolder)
	verticalView.findViewHolderForAdapterPosition(position));
	}

	@Override
	int getLayoutResourceId() {
	return R.layout.lb_rows_fragment;
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	mSelectAnimatorDuration = getResources().getInteger(
	R.integer.lb_browse_rows_anim_duration);
	}

	@Override
	public void onViewCreated(View view, Bundle savedInstanceState) {
	if (DEBUG) Log.v(TAG, "onViewCreated");
	super.onViewCreated(view, savedInstanceState);
	// Align the top edge of child with id row_content.
	// Need set this for directly using RowsSupportFragment.
	getVerticalGridView().setItemAlignmentViewId(R.id.row_content);
	getVerticalGridView().setSaveChildrenPolicy(VerticalGridView.SAVE_LIMITED_CHILD);

	setAlignment(mAlignedTop);

	mRecycledViewPool = null;
	mPresenterMapper = null;
	if (mMainFragmentAdapter != null) {
	mMainFragmentAdapter.getFragmentHost().notifyViewCreated(mMainFragmentAdapter);
	}

	}

	@Override
	public void onDestroyView() {
	mViewsCreated = false;
	super.onDestroyView();
	}

	void setExternalAdapterListener(ItemBridgeAdapter.AdapterListener listener) {
	mExternalAdapterListener = listener;
	}

	private static void setRowViewExpanded(ItemBridgeAdapter.ViewHolder vh, boolean expanded) {
	((RowPresenter) vh.getPresenter()).setRowViewExpanded(vh.getViewHolder(), expanded);
	}

	private static void setRowViewSelected(ItemBridgeAdapter.ViewHolder vh, boolean selected,
	boolean immediate) {
	RowViewHolderExtra extra = (RowViewHolderExtra) vh.getExtraObject();
	extra.animateSelect(selected, immediate);
	((RowPresenter) vh.getPresenter()).setRowViewSelected(vh.getViewHolder(), selected);
	}

	private final ItemBridgeAdapter.AdapterListener mBridgeAdapterListener =
	new ItemBridgeAdapter.AdapterListener() {
	@Override
	public void onAddPresenter(Presenter presenter, int type) {
	if (mExternalAdapterListener != null) {
	mExternalAdapterListener.onAddPresenter(presenter, type);
	}
	}

	@Override
	public void onCreate(ItemBridgeAdapter.ViewHolder vh) {
	VerticalGridView listView = getVerticalGridView();
	if (listView != null) {
	// set clip children false for slide animation
	listView.setClipChildren(false);
	}
	setupSharedViewPool(vh);
	mViewsCreated = true;
	vh.setExtraObject(new RowViewHolderExtra(vh));
	// selected state is initialized to false, then driven by grid view onChildSelected
	// events. When there is rebind, grid view fires onChildSelected event properly.
	// So we don't need do anything special later in onBind or onAttachedToWindow.
	setRowViewSelected(vh, false, true);
	if (mExternalAdapterListener != null) {
	mExternalAdapterListener.onCreate(vh);
	}
	}

	@Override
	public void onAttachedToWindow(ItemBridgeAdapter.ViewHolder vh) {
	if (DEBUG) Log.v(TAG, "onAttachToWindow");
	// All views share the same mExpand value. When we attach a view to grid view,
	// we should make sure it pick up the latest mExpand value we set early on other
	// attached views. For no-structure-change update, the view is rebound to new data,
	// but again it should use the unchanged mExpand value, so we don't need do any
	// thing in onBind.
	setRowViewExpanded(vh, mExpand);
	RowPresenter rowPresenter = (RowPresenter) vh.getPresenter();
	RowPresenter.ViewHolder rowVh = rowPresenter.getRowViewHolder(vh.getViewHolder());
	rowVh.setOnItemViewSelectedListener(mOnItemViewSelectedListener);
	rowVh.setOnItemViewClickedListener(mOnItemViewClickedListener);
	rowPresenter.setEntranceTransitionState(rowVh, mAfterEntranceTransition);
	if (mExternalAdapterListener != null) {
	mExternalAdapterListener.onAttachedToWindow(vh);
	}
	}

	@Override
	public void onDetachedFromWindow(ItemBridgeAdapter.ViewHolder vh) {
	if (mSelectedViewHolder == vh) {
	setRowViewSelected(mSelectedViewHolder, false, true);
	mSelectedViewHolder = null;
	}
	if (mExternalAdapterListener != null) {
	mExternalAdapterListener.onDetachedFromWindow(vh);
	}
	}

	@Override
	public void onBind(ItemBridgeAdapter.ViewHolder vh) {
	if (mExternalAdapterListener != null) {
	mExternalAdapterListener.onBind(vh);
	}
	}

	@Override
	public void onUnbind(ItemBridgeAdapter.ViewHolder vh) {
	setRowViewSelected(vh, false, true);
	if (mExternalAdapterListener != null) {
	mExternalAdapterListener.onUnbind(vh);
	}
	}
	};

	private void setupSharedViewPool(ItemBridgeAdapter.ViewHolder bridgeVh) {
	RowPresenter rowPresenter = (RowPresenter) bridgeVh.getPresenter();
	RowPresenter.ViewHolder rowVh = rowPresenter.getRowViewHolder(bridgeVh.getViewHolder());

	if (rowVh instanceof ListRowPresenter.ViewHolder) {
	HorizontalGridView view = ((ListRowPresenter.ViewHolder) rowVh).getGridView();
	// Recycled view pool is shared between all list rows
	if (mRecycledViewPool == null) {
	mRecycledViewPool = view.getRecycledViewPool();
	} else {
	view.setRecycledViewPool(mRecycledViewPool);
	}

	ItemBridgeAdapter bridgeAdapter =
	((ListRowPresenter.ViewHolder) rowVh).getBridgeAdapter();
	if (mPresenterMapper == null) {
	mPresenterMapper = bridgeAdapter.getPresenterMapper();
	} else {
	bridgeAdapter.setPresenterMapper(mPresenterMapper);
	}
	}
	}

	@Override
	void updateAdapter() {
	super.updateAdapter();
	mSelectedViewHolder = null;
	mViewsCreated = false;

	ItemBridgeAdapter adapter = getBridgeAdapter();
	if (adapter != null) {
	adapter.setAdapterListener(mBridgeAdapterListener);
	}
	}

	@Override
	public boolean onTransitionPrepare() {
	boolean prepared = super.onTransitionPrepare();
	if (prepared) {
	freezeRows(true);
	}
	return prepared;
	}

	@Override
	public void onTransitionEnd() {
	super.onTransitionEnd();
	freezeRows(false);
	}

	private void freezeRows(boolean freeze) {
	VerticalGridView verticalView = getVerticalGridView();
	if (verticalView != null) {
	final int count = verticalView.getChildCount();
	for (int i = 0; i < count; i++) {
	ItemBridgeAdapter.ViewHolder ibvh = (ItemBridgeAdapter.ViewHolder)
	verticalView.getChildViewHolder(verticalView.getChildAt(i));
	RowPresenter rowPresenter = (RowPresenter) ibvh.getPresenter();
	RowPresenter.ViewHolder vh = rowPresenter.getRowViewHolder(ibvh.getViewHolder());
	rowPresenter.freeze(vh, freeze);
	}
	}
	}

	/**
	* For rows that willing to participate entrance transition, this function
	* hide views if afterTransition is true, show views if afterTransition is false.
	*/
	public void setEntranceTransitionState(boolean afterTransition) {
	mAfterEntranceTransition = afterTransition;
	VerticalGridView verticalView = getVerticalGridView();
	if (verticalView != null) {
	final int count = verticalView.getChildCount();
	for (int i = 0; i < count; i++) {
	ItemBridgeAdapter.ViewHolder ibvh = (ItemBridgeAdapter.ViewHolder)
	verticalView.getChildViewHolder(verticalView.getChildAt(i));
	RowPresenter rowPresenter = (RowPresenter) ibvh.getPresenter();
	RowPresenter.ViewHolder vh = rowPresenter.getRowViewHolder(ibvh.getViewHolder());
	rowPresenter.setEntranceTransitionState(vh, mAfterEntranceTransition);
	}
	}
	}

	/**
	* Selects a Row and perform an optional task on the Row. For example
	* <code>setSelectedPosition(10, true, new ListRowPresenterSelectItemViewHolderTask(5))</code>
	* Scroll to 11th row and selects 6th item on that row. The method will be ignored if
	* RowsSupportFragment has not been created (i.e. before {@link #onCreateView(LayoutInflater,
	* ViewGroup, Bundle)}).
	*
	* @param rowPosition Which row to select.
	* @param smooth True to scroll to the row, false for no animation.
	* @param rowHolderTask Task to perform on the Row.
	*/
	public void setSelectedPosition(int rowPosition, boolean smooth,
	final Presenter.ViewHolderTask rowHolderTask) {
	VerticalGridView verticalView = getVerticalGridView();
	if (verticalView == null) {
	return;
	}
	ViewHolderTask task = null;
	if (rowHolderTask != null) {
	// This task will execute once the scroll completes. Once the scrolling finishes,
	// we will get a success callback to update selected row position. Since the
	// update to selected row position happens in a post, we want to ensure that this
	// gets called after that.
	task = new ViewHolderTask() {
	@Override
	public void run(final RecyclerView.ViewHolder rvh) {
	rvh.itemView.post(new Runnable() {
	@Override
	public void run() {
	rowHolderTask.run(
	getRowViewHolder((ItemBridgeAdapter.ViewHolder) rvh));
	}
	});
	}
	};
	}

	if (smooth) {
	verticalView.setSelectedPositionSmooth(rowPosition, task);
	} else {
	verticalView.setSelectedPosition(rowPosition, task);
	}
	}

	static RowPresenter.ViewHolder getRowViewHolder(ItemBridgeAdapter.ViewHolder ibvh) {
	if (ibvh == null) {
	return null;
	}
	RowPresenter rowPresenter = (RowPresenter) ibvh.getPresenter();
	return rowPresenter.getRowViewHolder(ibvh.getViewHolder());
	}

	public boolean isScrolling() {
	if (getVerticalGridView() == null) {
	return false;
	}
	return getVerticalGridView().getScrollState() != HorizontalGridView.SCROLL_STATE_IDLE;
	}

	@Override
	public void setAlignment(int windowAlignOffsetFromTop) {
	mAlignedTop = windowAlignOffsetFromTop;
	final VerticalGridView gridView = getVerticalGridView();

	if (gridView != null) {
	gridView.setItemAlignmentOffset(0);
	gridView.setItemAlignmentOffsetPercent(
	VerticalGridView.ITEM_ALIGN_OFFSET_PERCENT_DISABLED);
	gridView.setItemAlignmentOffsetWithPadding(true);
	gridView.setWindowAlignmentOffset(mAlignedTop);
	// align to a fixed position from top
	gridView.setWindowAlignmentOffsetPercent(
	VerticalGridView.WINDOW_ALIGN_OFFSET_PERCENT_DISABLED);
	gridView.setWindowAlignment(VerticalGridView.WINDOW_ALIGN_NO_EDGE);
	}
	}

	public static class MainFragmentAdapter extends BrowseSupportFragment.MainFragmentAdapter<RowsSupportFragment> {

	public MainFragmentAdapter(RowsSupportFragment fragment) {
	super(fragment);
	setScalingEnabled(true);
	}

	@Override
	public boolean isScrolling() {
	return getFragment().isScrolling();
	}

	@Override
	public void setExpand(boolean expand) {
	getFragment().setExpand(expand);
	}

	@Override
	public void setEntranceTransitionState(boolean state) {
	getFragment().setEntranceTransitionState(state);
	}

	@Override
	public void setAlignment(int windowAlignOffsetFromTop) {
	getFragment().setAlignment(windowAlignOffsetFromTop);
	}

	@Override
	public boolean onTransitionPrepare() {
	return getFragment().onTransitionPrepare();
	}

	@Override
	public void onTransitionStart() {
	getFragment().onTransitionStart();
	}

	@Override
	public void onTransitionEnd() {
	getFragment().onTransitionEnd();
	}

	}

	public static class MainFragmentRowsAdapter
	extends BrowseSupportFragment.MainFragmentRowsAdapter<RowsSupportFragment> {

	public MainFragmentRowsAdapter(RowsSupportFragment fragment) {
	super(fragment);
	}

	@Override
	public void setAdapter(ObjectAdapter adapter) {
	getFragment().setAdapter(adapter);
	}

	/**
	* Sets an item clicked listener on the fragment.
	*/
	@Override
	public void setOnItemViewClickedListener(OnItemViewClickedListener listener) {
	getFragment().setOnItemViewClickedListener(listener);
	}

	@Override
	public void setOnItemViewSelectedListener(OnItemViewSelectedListener listener) {
	getFragment().setOnItemViewSelectedListener(listener);
	}

	@Override
	public void setSelectedPosition(int rowPosition,
	boolean smooth,
	final Presenter.ViewHolderTask rowHolderTask) {
	getFragment().setSelectedPosition(rowPosition, smooth, rowHolderTask);
	}

	@Override
	public void setSelectedPosition(int rowPosition, boolean smooth) {
	getFragment().setSelectedPosition(rowPosition, smooth);
	}

	@Override
	public int getSelectedPosition() {
	return getFragment().getSelectedPosition();
	}
	}
	}