src/com/android/settings/localepicker/LocaleDragAndDropAdapter.java - platform/packages/apps/Settings - Git at Google

 /*
  * 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.settings.localepicker;

 import android.content.Context;
 import android.graphics.Canvas;
 import android.os.Bundle;
 import android.os.LocaleList;
 import android.support.v4.view.MotionEventCompat;
 import android.support.v7.widget.RecyclerView;
 import android.support.v7.widget.helper.ItemTouchHelper;
 import android.util.Log;
 import android.util.TypedValue;
 import android.view.LayoutInflater;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.CompoundButton;

 import com.android.internal.app.LocalePicker;
 import com.android.internal.app.LocaleStore;

 import com.android.settings.R;

 import java.text.NumberFormat;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;


 class LocaleDragAndDropAdapter
         extends RecyclerView.Adapter<LocaleDragAndDropAdapter.CustomViewHolder> {

     private static final String TAG = "LocaleDragAndDropAdapter";
     private static final String CFGKEY_SELECTED_LOCALES = "selectedLocales";
     private final Context mContext;
     private final List<LocaleStore.LocaleInfo> mFeedItemList;
     private final ItemTouchHelper mItemTouchHelper;
     private RecyclerView mParentView = null;
     private boolean mRemoveMode = false;
     private boolean mDragEnabled = true;
     private NumberFormat mNumberFormatter = NumberFormat.getNumberInstance();

     class CustomViewHolder extends RecyclerView.ViewHolder implements View.OnTouchListener {
         private final LocaleDragCell mLocaleDragCell;

         public CustomViewHolder(LocaleDragCell view) {
             super(view);
             mLocaleDragCell = view;
             mLocaleDragCell.getDragHandle().setOnTouchListener(this);
         }

         public LocaleDragCell getLocaleDragCell() {
             return mLocaleDragCell;
         }

         @Override
         public boolean onTouch(View v, MotionEvent event) {
             if (mDragEnabled) {
                 switch (MotionEventCompat.getActionMasked(event)) {
                     case MotionEvent.ACTION_DOWN:
                         mItemTouchHelper.startDrag(this);
                 }
             }
             return false;
         }
     }

     public LocaleDragAndDropAdapter(Context context, List<LocaleStore.LocaleInfo> feedItemList) {
         this.mFeedItemList = feedItemList;

         this.mContext = context;

         final float dragElevation = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8,
                 context.getResources().getDisplayMetrics());

         this.mItemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(
                 ItemTouchHelper.UP | ItemTouchHelper.DOWN, 0 /* no swipe */) {

             @Override
             public boolean onMove(RecyclerView view, RecyclerView.ViewHolder source,
                     RecyclerView.ViewHolder target) {
                 onItemMove(source.getAdapterPosition(), target.getAdapterPosition());
                 return true;
             }

             @Override
             public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
                 // Swipe is disabled, this is intentionally empty.
             }

             private static final int SELECTION_GAINED = 1;
             private static final int SELECTION_LOST = 0;
             private static final int SELECTION_UNCHANGED = -1;
             private int mSelectionStatus = SELECTION_UNCHANGED;

             @Override
             public void onChildDraw(Canvas c, RecyclerView recyclerView,
                     RecyclerView.ViewHolder viewHolder, float dX, float dY,
                     int actionState, boolean isCurrentlyActive) {

                 super.onChildDraw(c, recyclerView, viewHolder, dX, dY,
                         actionState, isCurrentlyActive);
                 // We change the elevation if selection changed
                 if (mSelectionStatus != SELECTION_UNCHANGED) {
                     viewHolder.itemView.setElevation(
                             mSelectionStatus == SELECTION_GAINED ? dragElevation : 0);
                     mSelectionStatus = SELECTION_UNCHANGED;
                 }
             }

             @Override
             public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
                 super.onSelectedChanged(viewHolder, actionState);
                 if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) {
                     mSelectionStatus = SELECTION_GAINED;
                 } else if (actionState == ItemTouchHelper.ACTION_STATE_IDLE) {
                     mSelectionStatus = SELECTION_LOST;
                 }
             }
         });
     }

     public void setRecyclerView(RecyclerView rv) {
         mParentView = rv;
         mItemTouchHelper.attachToRecyclerView(rv);
     }

     @Override
     public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
         final LocaleDragCell item = (LocaleDragCell) LayoutInflater.from(mContext)
                 .inflate(R.layout.locale_drag_cell, viewGroup, false);
         return new CustomViewHolder(item);
     }

     @Override
     public void onBindViewHolder(final CustomViewHolder holder, int i) {
         final LocaleStore.LocaleInfo feedItem = mFeedItemList.get(i);
         final LocaleDragCell dragCell = holder.getLocaleDragCell();
         final String label = feedItem.getFullNameNative();
         final String description = feedItem.getFullNameInUiLanguage();
         dragCell.setLabelAndDescription(label, description);
         dragCell.setLocalized(feedItem.isTranslated());
         dragCell.setMiniLabel(mNumberFormatter.format(i + 1));
         dragCell.setShowCheckbox(mRemoveMode);
         dragCell.setShowMiniLabel(!mRemoveMode);
         dragCell.setShowHandle(!mRemoveMode && mDragEnabled);
         dragCell.setChecked(mRemoveMode ? feedItem.getChecked() : false);
         dragCell.setTag(feedItem);
         dragCell.getCheckbox()
                 .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                     @Override
                     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                         LocaleStore.LocaleInfo feedItem =
                                 (LocaleStore.LocaleInfo) dragCell.getTag();
                         feedItem.setChecked(isChecked);
                     }
                 });
     }

     @Override
     public int getItemCount() {
         int itemCount = (null != mFeedItemList ? mFeedItemList.size() : 0);
         if (itemCount < 2 || mRemoveMode) {
             setDragEnabled(false);
         } else {
             setDragEnabled(true);
         }
         return itemCount;
     }

     void onItemMove(int fromPosition, int toPosition) {
         if (fromPosition >= 0 && toPosition >= 0) {
             final LocaleStore.LocaleInfo saved = mFeedItemList.get(fromPosition);
             mFeedItemList.remove(fromPosition);
             mFeedItemList.add(toPosition, saved);
         } else {
             // TODO: It looks like sometimes the RecycleView tries to swap item -1
             // I did not see it in a while, but if it happens, investigate and file a bug.
             Log.e(TAG, String.format(Locale.US,
                     "Negative position in onItemMove %d -> %d", fromPosition, toPosition));
         }
         notifyItemChanged(fromPosition); // to update the numbers
         notifyItemChanged(toPosition);
         notifyItemMoved(fromPosition, toPosition);
         // We don't call doTheUpdate() here because this method is called for each item swap.
         // So if we drag something across several positions it will be called several times.
     }

     void setRemoveMode(boolean removeMode) {
         mRemoveMode = removeMode;
         int itemCount = mFeedItemList.size();
         for (int i = 0; i < itemCount; i++) {
             mFeedItemList.get(i).setChecked(false);
             notifyItemChanged(i);
         }
     }

     boolean isRemoveMode() {
         return mRemoveMode;
     }

     void removeItem(int position) {
         int itemCount = mFeedItemList.size();
         if (itemCount <= 1) {
             return;
         }
         if (position < 0 || position >= itemCount) {
             return;
         }
         mFeedItemList.remove(position);
         notifyDataSetChanged();
     }

     void removeChecked() {
         int itemCount = mFeedItemList.size();
         for (int i = itemCount - 1; i >= 0; i--) {
             if (mFeedItemList.get(i).getChecked()) {
                 mFeedItemList.remove(i);
             }
         }
         notifyDataSetChanged();
         doTheUpdate();
     }

     int getCheckedCount() {
         int result = 0;
         for (LocaleStore.LocaleInfo li : mFeedItemList) {
             if (li.getChecked()) {
                 result++;
             }
         }
         return result;
     }

     LocaleStore.LocaleInfo getFirstChecked() {
         for (LocaleStore.LocaleInfo li : mFeedItemList) {
             if (li.getChecked()) {
                 return li;
             }
         }
         return null;
     }

     void addLocale(LocaleStore.LocaleInfo li) {
         mFeedItemList.add(li);
         notifyItemInserted(mFeedItemList.size() - 1);
         doTheUpdate();
     }

     public void doTheUpdate() {
         int count = mFeedItemList.size();
         final Locale[] newList = new Locale[count];

         for (int i = 0; i < count; i++) {
             final LocaleStore.LocaleInfo li = mFeedItemList.get(i);
             newList[i] = li.getLocale();
         }

         final LocaleList ll = new LocaleList(newList);
         updateLocalesWhenAnimationStops(ll);
     }

     private LocaleList mLocalesToSetNext = null;
     private LocaleList mLocalesSetLast = null;

     public void updateLocalesWhenAnimationStops(final LocaleList localeList) {
         if (localeList.equals(mLocalesToSetNext)) {
             return;
         }

         // This will only update the Settings application to make things feel more responsive,
         // the system will be updated later, when animation stopped.
         LocaleList.setDefault(localeList);

         mLocalesToSetNext = localeList;
         final RecyclerView.ItemAnimator itemAnimator = mParentView.getItemAnimator();
         itemAnimator.isRunning(new RecyclerView.ItemAnimator.ItemAnimatorFinishedListener() {
             @Override
             public void onAnimationsFinished() {
                 if (mLocalesToSetNext == null || mLocalesToSetNext.equals(mLocalesSetLast)) {
                     // All animations finished, but the locale list did not change
                     return;
                 }

                 LocalePicker.updateLocales(mLocalesToSetNext);
                 mLocalesSetLast = mLocalesToSetNext;
                 mLocalesToSetNext = null;

                 mNumberFormatter = NumberFormat.getNumberInstance(Locale.getDefault());
             }
         });
     }

     private void setDragEnabled(boolean enabled) {
         mDragEnabled = enabled;
     }

     /**
      * Saves the list of checked locales to preserve status when the list is destroyed.
      * (for instance when the device is rotated)
      * @param outInstanceState Bundle in which to place the saved state
      */
     public void saveState(Bundle outInstanceState) {
         if (outInstanceState != null) {
             final ArrayList<String> selectedLocales = new ArrayList<>();
             for (LocaleStore.LocaleInfo li : mFeedItemList) {
                 if (li.getChecked()) {
                     selectedLocales.add(li.getId());
                 }
             }
             outInstanceState.putStringArrayList(CFGKEY_SELECTED_LOCALES, selectedLocales);
         }
     }

     /**
      * Restores the list of checked locales to preserve status when the list is recreated.
      * (for instance when the device is rotated)
      * @param savedInstanceState Bundle with the data saved by {@link #saveState(Bundle)}
      */
     public void restoreState(Bundle savedInstanceState) {
         if (savedInstanceState != null && mRemoveMode) {
             final ArrayList<String> selectedLocales =
                     savedInstanceState.getStringArrayList(CFGKEY_SELECTED_LOCALES);
             if (selectedLocales == null || selectedLocales.isEmpty()) {
                 return;
             }
             for (LocaleStore.LocaleInfo li : mFeedItemList) {
                 li.setChecked(selectedLocales.contains(li.getId()));
             }
             notifyItemRangeChanged(0, mFeedItemList.size());
         }
     }
 }
	/*
	* 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.settings.localepicker;

	import android.content.Context;
	import android.graphics.Canvas;
	import android.os.Bundle;
	import android.os.LocaleList;
	import android.support.v4.view.MotionEventCompat;
	import android.support.v7.widget.RecyclerView;
	import android.support.v7.widget.helper.ItemTouchHelper;
	import android.util.Log;
	import android.util.TypedValue;
	import android.view.LayoutInflater;
	import android.view.MotionEvent;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.CompoundButton;

	import com.android.internal.app.LocalePicker;
	import com.android.internal.app.LocaleStore;

	import com.android.settings.R;

	import java.text.NumberFormat;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.Locale;


	class LocaleDragAndDropAdapter
	extends RecyclerView.Adapter<LocaleDragAndDropAdapter.CustomViewHolder> {

	private static final String TAG = "LocaleDragAndDropAdapter";
	private static final String CFGKEY_SELECTED_LOCALES = "selectedLocales";
	private final Context mContext;
	private final List<LocaleStore.LocaleInfo> mFeedItemList;
	private final ItemTouchHelper mItemTouchHelper;
	private RecyclerView mParentView = null;
	private boolean mRemoveMode = false;
	private boolean mDragEnabled = true;
	private NumberFormat mNumberFormatter = NumberFormat.getNumberInstance();

	class CustomViewHolder extends RecyclerView.ViewHolder implements View.OnTouchListener {
	private final LocaleDragCell mLocaleDragCell;

	public CustomViewHolder(LocaleDragCell view) {
	super(view);
	mLocaleDragCell = view;
	mLocaleDragCell.getDragHandle().setOnTouchListener(this);
	}

	public LocaleDragCell getLocaleDragCell() {
	return mLocaleDragCell;
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
	if (mDragEnabled) {
	switch (MotionEventCompat.getActionMasked(event)) {
	case MotionEvent.ACTION_DOWN:
	mItemTouchHelper.startDrag(this);
	}
	}
	return false;
	}
	}

	public LocaleDragAndDropAdapter(Context context, List<LocaleStore.LocaleInfo> feedItemList) {
	this.mFeedItemList = feedItemList;

	this.mContext = context;

	final float dragElevation = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 8,
	context.getResources().getDisplayMetrics());

	this.mItemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(
	ItemTouchHelper.UP \| ItemTouchHelper.DOWN, 0 /* no swipe */) {

	@Override
	public boolean onMove(RecyclerView view, RecyclerView.ViewHolder source,
	RecyclerView.ViewHolder target) {
	onItemMove(source.getAdapterPosition(), target.getAdapterPosition());
	return true;
	}

	@Override
	public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
	// Swipe is disabled, this is intentionally empty.
	}

	private static final int SELECTION_GAINED = 1;
	private static final int SELECTION_LOST = 0;
	private static final int SELECTION_UNCHANGED = -1;
	private int mSelectionStatus = SELECTION_UNCHANGED;

	@Override
	public void onChildDraw(Canvas c, RecyclerView recyclerView,
	RecyclerView.ViewHolder viewHolder, float dX, float dY,
	int actionState, boolean isCurrentlyActive) {

	super.onChildDraw(c, recyclerView, viewHolder, dX, dY,
	actionState, isCurrentlyActive);
	// We change the elevation if selection changed
	if (mSelectionStatus != SELECTION_UNCHANGED) {
	viewHolder.itemView.setElevation(
	mSelectionStatus == SELECTION_GAINED ? dragElevation : 0);
	mSelectionStatus = SELECTION_UNCHANGED;
	}
	}

	@Override
	public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
	super.onSelectedChanged(viewHolder, actionState);
	if (actionState == ItemTouchHelper.ACTION_STATE_DRAG) {
	mSelectionStatus = SELECTION_GAINED;
	} else if (actionState == ItemTouchHelper.ACTION_STATE_IDLE) {
	mSelectionStatus = SELECTION_LOST;
	}
	}
	});
	}

	public void setRecyclerView(RecyclerView rv) {
	mParentView = rv;
	mItemTouchHelper.attachToRecyclerView(rv);
	}

	@Override
	public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
	final LocaleDragCell item = (LocaleDragCell) LayoutInflater.from(mContext)
	.inflate(R.layout.locale_drag_cell, viewGroup, false);
	return new CustomViewHolder(item);
	}

	@Override
	public void onBindViewHolder(final CustomViewHolder holder, int i) {
	final LocaleStore.LocaleInfo feedItem = mFeedItemList.get(i);
	final LocaleDragCell dragCell = holder.getLocaleDragCell();
	final String label = feedItem.getFullNameNative();
	final String description = feedItem.getFullNameInUiLanguage();
	dragCell.setLabelAndDescription(label, description);
	dragCell.setLocalized(feedItem.isTranslated());
	dragCell.setMiniLabel(mNumberFormatter.format(i + 1));
	dragCell.setShowCheckbox(mRemoveMode);
	dragCell.setShowMiniLabel(!mRemoveMode);
	dragCell.setShowHandle(!mRemoveMode && mDragEnabled);
	dragCell.setChecked(mRemoveMode ? feedItem.getChecked() : false);
	dragCell.setTag(feedItem);
	dragCell.getCheckbox()
	.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
	@Override
	public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
	LocaleStore.LocaleInfo feedItem =
	(LocaleStore.LocaleInfo) dragCell.getTag();
	feedItem.setChecked(isChecked);
	}
	});
	}

	@Override
	public int getItemCount() {
	int itemCount = (null != mFeedItemList ? mFeedItemList.size() : 0);
	if (itemCount < 2 \|\| mRemoveMode) {
	setDragEnabled(false);
	} else {
	setDragEnabled(true);
	}
	return itemCount;
	}

	void onItemMove(int fromPosition, int toPosition) {
	if (fromPosition >= 0 && toPosition >= 0) {
	final LocaleStore.LocaleInfo saved = mFeedItemList.get(fromPosition);
	mFeedItemList.remove(fromPosition);
	mFeedItemList.add(toPosition, saved);
	} else {
	// TODO: It looks like sometimes the RecycleView tries to swap item -1
	// I did not see it in a while, but if it happens, investigate and file a bug.
	Log.e(TAG, String.format(Locale.US,
	"Negative position in onItemMove %d -> %d", fromPosition, toPosition));
	}
	notifyItemChanged(fromPosition); // to update the numbers
	notifyItemChanged(toPosition);
	notifyItemMoved(fromPosition, toPosition);
	// We don't call doTheUpdate() here because this method is called for each item swap.
	// So if we drag something across several positions it will be called several times.
	}

	void setRemoveMode(boolean removeMode) {
	mRemoveMode = removeMode;
	int itemCount = mFeedItemList.size();
	for (int i = 0; i < itemCount; i++) {
	mFeedItemList.get(i).setChecked(false);
	notifyItemChanged(i);
	}
	}

	boolean isRemoveMode() {
	return mRemoveMode;
	}

	void removeItem(int position) {
	int itemCount = mFeedItemList.size();
	if (itemCount <= 1) {
	return;
	}
	if (position < 0 \|\| position >= itemCount) {
	return;
	}
	mFeedItemList.remove(position);
	notifyDataSetChanged();
	}

	void removeChecked() {
	int itemCount = mFeedItemList.size();
	for (int i = itemCount - 1; i >= 0; i--) {
	if (mFeedItemList.get(i).getChecked()) {
	mFeedItemList.remove(i);
	}
	}
	notifyDataSetChanged();
	doTheUpdate();
	}

	int getCheckedCount() {
	int result = 0;
	for (LocaleStore.LocaleInfo li : mFeedItemList) {
	if (li.getChecked()) {
	result++;
	}
	}
	return result;
	}

	LocaleStore.LocaleInfo getFirstChecked() {
	for (LocaleStore.LocaleInfo li : mFeedItemList) {
	if (li.getChecked()) {
	return li;
	}
	}
	return null;
	}

	void addLocale(LocaleStore.LocaleInfo li) {
	mFeedItemList.add(li);
	notifyItemInserted(mFeedItemList.size() - 1);
	doTheUpdate();
	}

	public void doTheUpdate() {
	int count = mFeedItemList.size();
	final Locale[] newList = new Locale[count];

	for (int i = 0; i < count; i++) {
	final LocaleStore.LocaleInfo li = mFeedItemList.get(i);
	newList[i] = li.getLocale();
	}

	final LocaleList ll = new LocaleList(newList);
	updateLocalesWhenAnimationStops(ll);
	}

	private LocaleList mLocalesToSetNext = null;
	private LocaleList mLocalesSetLast = null;

	public void updateLocalesWhenAnimationStops(final LocaleList localeList) {
	if (localeList.equals(mLocalesToSetNext)) {
	return;
	}

	// This will only update the Settings application to make things feel more responsive,
	// the system will be updated later, when animation stopped.
	LocaleList.setDefault(localeList);

	mLocalesToSetNext = localeList;
	final RecyclerView.ItemAnimator itemAnimator = mParentView.getItemAnimator();
	itemAnimator.isRunning(new RecyclerView.ItemAnimator.ItemAnimatorFinishedListener() {
	@Override
	public void onAnimationsFinished() {
	if (mLocalesToSetNext == null \|\| mLocalesToSetNext.equals(mLocalesSetLast)) {
	// All animations finished, but the locale list did not change
	return;
	}

	LocalePicker.updateLocales(mLocalesToSetNext);
	mLocalesSetLast = mLocalesToSetNext;
	mLocalesToSetNext = null;

	mNumberFormatter = NumberFormat.getNumberInstance(Locale.getDefault());
	}
	});
	}

	private void setDragEnabled(boolean enabled) {
	mDragEnabled = enabled;
	}

	/**
	* Saves the list of checked locales to preserve status when the list is destroyed.
	* (for instance when the device is rotated)
	* @param outInstanceState Bundle in which to place the saved state
	*/
	public void saveState(Bundle outInstanceState) {
	if (outInstanceState != null) {
	final ArrayList<String> selectedLocales = new ArrayList<>();
	for (LocaleStore.LocaleInfo li : mFeedItemList) {
	if (li.getChecked()) {
	selectedLocales.add(li.getId());
	}
	}
	outInstanceState.putStringArrayList(CFGKEY_SELECTED_LOCALES, selectedLocales);
	}
	}

	/**
	* Restores the list of checked locales to preserve status when the list is recreated.
	* (for instance when the device is rotated)
	* @param savedInstanceState Bundle with the data saved by {@link #saveState(Bundle)}
	*/
	public void restoreState(Bundle savedInstanceState) {
	if (savedInstanceState != null && mRemoveMode) {
	final ArrayList<String> selectedLocales =
	savedInstanceState.getStringArrayList(CFGKEY_SELECTED_LOCALES);
	if (selectedLocales == null \|\| selectedLocales.isEmpty()) {
	return;
	}
	for (LocaleStore.LocaleInfo li : mFeedItemList) {
	li.setChecked(selectedLocales.contains(li.getId()));
	}
	notifyItemRangeChanged(0, mFeedItemList.size());
	}
	}
	}