src/com/android/car/notification/template/GroupNotificationViewHolder.java - platform/packages/apps/Car/Notification - Git at Google

 /*
  * Copyright (C) 2018 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.car.notification.template;

 import android.car.drivingstate.CarUxRestrictions;
 import android.car.drivingstate.CarUxRestrictionsManager;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Paint;
 import android.graphics.drawable.Drawable;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;

 import androidx.cardview.widget.CardView;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 import androidx.recyclerview.widget.SimpleItemAnimator;

 import com.android.car.notification.AlertEntry;
 import com.android.car.notification.CarNotificationItemTouchListener;
 import com.android.car.notification.CarNotificationViewAdapter;
 import com.android.car.notification.NotificationClickHandlerFactory;
 import com.android.car.notification.NotificationGroup;
 import com.android.car.notification.R;

 import java.util.ArrayList;
 import java.util.List;

 /**
  * ViewHolder that binds a list of notifications as a grouped notification.
  */
 public class GroupNotificationViewHolder extends CarNotificationBaseViewHolder
         implements CarUxRestrictionsManager.OnUxRestrictionsChangedListener {
     private final Context mContext;
     private final CardView mCardView;
     private final View mHeaderDividerView;
     private final ImageView mToggleIcon;
     private final TextView mExpansionFooterView;
     private final RecyclerView mNotificationListView;
     private final CarNotificationViewAdapter mAdapter;
     private final Drawable mExpandDrawable;
     private final Drawable mCollapseDrawable;
     private final Paint mPaint;
     private final int mDividerHeight;
     private final CarNotificationHeaderView mGroupHeaderView;
     private final View mTouchInterceptorView;
     private AlertEntry mSummaryNotification;
     private NotificationGroup mNotificationGroup;

     public GroupNotificationViewHolder(
             View view, NotificationClickHandlerFactory clickHandlerFactory) {
         super(view, clickHandlerFactory);
         mContext = view.getContext();

         mCardView = itemView.findViewById(R.id.card_view);
         mGroupHeaderView = view.findViewById(R.id.group_header);
         mHeaderDividerView = view.findViewById(R.id.header_divider);
         mToggleIcon = view.findViewById(R.id.group_toggle_icon);
         mExpansionFooterView = view.findViewById(R.id.expansion_footer);
         mNotificationListView = view.findViewById(R.id.notification_list);
         mTouchInterceptorView = view.findViewById(R.id.touch_interceptor_view);

         mExpandDrawable = mContext.getDrawable(R.drawable.expand_more);
         mCollapseDrawable = mContext.getDrawable(R.drawable.expand_less);

         mPaint = new Paint();
         mPaint.setColor(mContext.getColor(R.color.notification_list_divider_color));
         mDividerHeight = mContext.getResources().getDimensionPixelSize(
                 R.dimen.notification_list_divider_height);

         mNotificationListView.setLayoutManager(new LinearLayoutManager(mContext));
         mNotificationListView.addItemDecoration(new GroupedNotificationItemDecoration());
         ((SimpleItemAnimator) mNotificationListView.getItemAnimator())
                 .setSupportsChangeAnimations(false);
         mNotificationListView.setNestedScrollingEnabled(false);
         mAdapter = new CarNotificationViewAdapter(mContext, /* isGroupNotificationAdapter= */
                 true, /* notificationItemController= */ null);
         mAdapter.setClickHandlerFactory(clickHandlerFactory);
         mNotificationListView.addOnItemTouchListener(
                 new CarNotificationItemTouchListener(view.getContext(), mAdapter));
         mNotificationListView.setAdapter(mAdapter);
     }

     /**
      * Because this view holder does not call {@link CarNotificationBaseViewHolder#bind},
      * we need to override this method.
      */
     @Override
     public AlertEntry getAlertEntry() {
         return mSummaryNotification;
     }

     /**
      * Returns the notification group for this viewholder.
      *
      * @return NotificationGroup {@link NotificationGroup}.
      */
     public NotificationGroup getNotificationGroup() {
         return mNotificationGroup;
     }

     /**
      * Group notification view holder is special in that it requires extra data to bind,
      * therefore the standard bind() method is not used. We are calling super.reset()
      * directly and binding the onclick listener manually because the card's on click behavior is
      * different when collapsed/expanded.
      */
     public void bind(
             NotificationGroup group, CarNotificationViewAdapter parentAdapter, boolean isExpanded) {
         reset();

         mNotificationGroup = group;
         mSummaryNotification = group.getGroupSummaryNotification();

         // Bind the notification's data to the headerView.
         mGroupHeaderView.bind(mSummaryNotification, /* isInGroup= */ false);
         // Set the header's UI attributes (i.e. smallIconColor, etc.) based on the BaseViewHolder.
         bindHeader(mGroupHeaderView, /* isInGroup= */ false);

         // use the same view pool with all the grouped notifications
         // to increase the number of the shared views and reduce memory cost
         // the view pool is created and stored in the root adapter
         mNotificationListView.setRecycledViewPool(parentAdapter.getViewPool());

         // notification cards
         List<NotificationGroup> list = new ArrayList<>();
         if (isExpanded) {
             // show header divider
             mHeaderDividerView.setVisibility(View.VISIBLE);

             // all child notifications
             group.getChildNotifications().forEach(notification -> {
                 NotificationGroup notificationGroup = new NotificationGroup();
                 notificationGroup.addNotification(notification);
                 list.add(notificationGroup);
             });
         } else {
             // hide header divider
             mHeaderDividerView.setVisibility(View.GONE);

             // only show group summary notification
             NotificationGroup newGroup = new NotificationGroup();
             newGroup.addNotification(group.getGroupSummaryNotification());
             // If the group summary notification is automatically generated,
             // it does not contain a summary of the titles of the child notifications.
             // Therefore, we generate a list of the child notification titles from
             // the parent notification group, and pass them on.
             newGroup.setChildTitles(group.generateChildTitles());
             list.add(newGroup);
         }
         mAdapter.setNotifications(list,
                 /* setRecyclerViewListHeaderAndFooter= */ false);

         updateExpansionIcon(group.getChildCount(), isExpanded);
         updateOnClickListener(parentAdapter, group, isExpanded);
     }

     private void updateExpansionIcon(int childCount, boolean isExpanded) {
         // expansion button in the group header
         if (childCount == 0) {
             mToggleIcon.setVisibility(View.GONE);
             return;
         }
         mToggleIcon.setVisibility(View.VISIBLE);
         mToggleIcon.setImageDrawable(isExpanded ? mCollapseDrawable : mExpandDrawable);

         // Don't allow most controls to be focused when collapsed.
         mNotificationListView.setDescendantFocusability(isExpanded
                 ? ViewGroup.FOCUS_BEFORE_DESCENDANTS : ViewGroup.FOCUS_BLOCK_DESCENDANTS);
         mNotificationListView.setFocusable(false);
         mGroupHeaderView.setFocusable(isExpanded);
         mExpansionFooterView.setFocusable(isExpanded);

         // expansion button in the group footer
         if (isExpanded) {
             mExpansionFooterView.setText(mContext.getString(R.string.show_less));
             hideDismissButton();
             return;
         }

         int unshownCount = childCount - 2;
         mExpansionFooterView.setText(
                 unshownCount <= 0
                         ? mContext.getString(R.string.show_more)
                         : mContext.getString(R.string.show_count_more, unshownCount));
         updateDismissButton(getAlertEntry(), /* isHeadsUp= */ false);
     }

     private void updateOnClickListener(
             CarNotificationViewAdapter parentAdapter, NotificationGroup group, boolean isExpanded) {

         View.OnClickListener expansionClickListener = view -> {
             boolean isExpanding = !isExpanded;
             parentAdapter.setExpanded(group.getGroupKey(), isExpanding);
             mAdapter.notifyDataSetChanged();
         };

         if (isExpanded) {
             mCardView.setOnClickListener(null);
             mCardView.setClickable(false);
             mCardView.setFocusable(false);
         } else {
             mCardView.setOnClickListener(expansionClickListener);
         }
         mGroupHeaderView.setOnClickListener(expansionClickListener);
         mExpansionFooterView.setOnClickListener(expansionClickListener);
         mTouchInterceptorView.setOnClickListener(expansionClickListener);
         mTouchInterceptorView.setVisibility(isExpanded ? View.GONE : View.VISIBLE);
     }

     @Override
     public boolean isDismissible() {
         return mNotificationGroup == null || mNotificationGroup.isDismissible();
     }

     @Override
     void reset() {
         super.reset();
         mCardView.setOnClickListener(null);
         mGroupHeaderView.reset();
     }

     @Override
     public void onUxRestrictionsChanged(CarUxRestrictions restrictionInfo) {
         mAdapter.setCarUxRestrictions(mAdapter.getCarUxRestrictions());
     }

     private class GroupedNotificationItemDecoration extends RecyclerView.ItemDecoration {

         @Override
         public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
             // not drawing the divider for the last item
             for (int i = 0; i < parent.getChildCount() - 1; i++) {
                 drawDivider(c, parent.getChildAt(i));
             }
         }

         /**
          * Draws a divider under {@code container}.
          */
         private void drawDivider(Canvas c, View container) {
             int left = container.getLeft();
             int right = container.getRight();
             int bottom = container.getBottom() + mDividerHeight;
             int top = bottom - mDividerHeight;

             c.drawRect(left, top, right, bottom, mPaint);
         }
     }
 }
	/*
	* Copyright (C) 2018 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.car.notification.template;

	import android.car.drivingstate.CarUxRestrictions;
	import android.car.drivingstate.CarUxRestrictionsManager;
	import android.content.Context;
	import android.graphics.Canvas;
	import android.graphics.Paint;
	import android.graphics.drawable.Drawable;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.ImageView;
	import android.widget.TextView;

	import androidx.cardview.widget.CardView;
	import androidx.recyclerview.widget.LinearLayoutManager;
	import androidx.recyclerview.widget.RecyclerView;
	import androidx.recyclerview.widget.SimpleItemAnimator;

	import com.android.car.notification.AlertEntry;
	import com.android.car.notification.CarNotificationItemTouchListener;
	import com.android.car.notification.CarNotificationViewAdapter;
	import com.android.car.notification.NotificationClickHandlerFactory;
	import com.android.car.notification.NotificationGroup;
	import com.android.car.notification.R;

	import java.util.ArrayList;
	import java.util.List;

	/**
	* ViewHolder that binds a list of notifications as a grouped notification.
	*/
	public class GroupNotificationViewHolder extends CarNotificationBaseViewHolder
	implements CarUxRestrictionsManager.OnUxRestrictionsChangedListener {
	private final Context mContext;
	private final CardView mCardView;
	private final View mHeaderDividerView;
	private final ImageView mToggleIcon;
	private final TextView mExpansionFooterView;
	private final RecyclerView mNotificationListView;
	private final CarNotificationViewAdapter mAdapter;
	private final Drawable mExpandDrawable;
	private final Drawable mCollapseDrawable;
	private final Paint mPaint;
	private final int mDividerHeight;
	private final CarNotificationHeaderView mGroupHeaderView;
	private final View mTouchInterceptorView;
	private AlertEntry mSummaryNotification;
	private NotificationGroup mNotificationGroup;

	public GroupNotificationViewHolder(
	View view, NotificationClickHandlerFactory clickHandlerFactory) {
	super(view, clickHandlerFactory);
	mContext = view.getContext();

	mCardView = itemView.findViewById(R.id.card_view);
	mGroupHeaderView = view.findViewById(R.id.group_header);
	mHeaderDividerView = view.findViewById(R.id.header_divider);
	mToggleIcon = view.findViewById(R.id.group_toggle_icon);
	mExpansionFooterView = view.findViewById(R.id.expansion_footer);
	mNotificationListView = view.findViewById(R.id.notification_list);
	mTouchInterceptorView = view.findViewById(R.id.touch_interceptor_view);

	mExpandDrawable = mContext.getDrawable(R.drawable.expand_more);
	mCollapseDrawable = mContext.getDrawable(R.drawable.expand_less);

	mPaint = new Paint();
	mPaint.setColor(mContext.getColor(R.color.notification_list_divider_color));
	mDividerHeight = mContext.getResources().getDimensionPixelSize(
	R.dimen.notification_list_divider_height);

	mNotificationListView.setLayoutManager(new LinearLayoutManager(mContext));
	mNotificationListView.addItemDecoration(new GroupedNotificationItemDecoration());
	((SimpleItemAnimator) mNotificationListView.getItemAnimator())
	.setSupportsChangeAnimations(false);
	mNotificationListView.setNestedScrollingEnabled(false);
	mAdapter = new CarNotificationViewAdapter(mContext, /* isGroupNotificationAdapter= */
	true, /* notificationItemController= */ null);
	mAdapter.setClickHandlerFactory(clickHandlerFactory);
	mNotificationListView.addOnItemTouchListener(
	new CarNotificationItemTouchListener(view.getContext(), mAdapter));
	mNotificationListView.setAdapter(mAdapter);
	}

	/**
	* Because this view holder does not call {@link CarNotificationBaseViewHolder#bind},
	* we need to override this method.
	*/
	@Override
	public AlertEntry getAlertEntry() {
	return mSummaryNotification;
	}

	/**
	* Returns the notification group for this viewholder.
	*
	* @return NotificationGroup {@link NotificationGroup}.
	*/
	public NotificationGroup getNotificationGroup() {
	return mNotificationGroup;
	}

	/**
	* Group notification view holder is special in that it requires extra data to bind,
	* therefore the standard bind() method is not used. We are calling super.reset()
	* directly and binding the onclick listener manually because the card's on click behavior is
	* different when collapsed/expanded.
	*/
	public void bind(
	NotificationGroup group, CarNotificationViewAdapter parentAdapter, boolean isExpanded) {
	reset();

	mNotificationGroup = group;
	mSummaryNotification = group.getGroupSummaryNotification();

	// Bind the notification's data to the headerView.
	mGroupHeaderView.bind(mSummaryNotification, /* isInGroup= */ false);
	// Set the header's UI attributes (i.e. smallIconColor, etc.) based on the BaseViewHolder.
	bindHeader(mGroupHeaderView, /* isInGroup= */ false);

	// use the same view pool with all the grouped notifications
	// to increase the number of the shared views and reduce memory cost
	// the view pool is created and stored in the root adapter
	mNotificationListView.setRecycledViewPool(parentAdapter.getViewPool());

	// notification cards
	List<NotificationGroup> list = new ArrayList<>();
	if (isExpanded) {
	// show header divider
	mHeaderDividerView.setVisibility(View.VISIBLE);

	// all child notifications
	group.getChildNotifications().forEach(notification -> {
	NotificationGroup notificationGroup = new NotificationGroup();
	notificationGroup.addNotification(notification);
	list.add(notificationGroup);
	});
	} else {
	// hide header divider
	mHeaderDividerView.setVisibility(View.GONE);

	// only show group summary notification
	NotificationGroup newGroup = new NotificationGroup();
	newGroup.addNotification(group.getGroupSummaryNotification());
	// If the group summary notification is automatically generated,
	// it does not contain a summary of the titles of the child notifications.
	// Therefore, we generate a list of the child notification titles from
	// the parent notification group, and pass them on.
	newGroup.setChildTitles(group.generateChildTitles());
	list.add(newGroup);
	}
	mAdapter.setNotifications(list,
	/* setRecyclerViewListHeaderAndFooter= */ false);

	updateExpansionIcon(group.getChildCount(), isExpanded);
	updateOnClickListener(parentAdapter, group, isExpanded);
	}

	private void updateExpansionIcon(int childCount, boolean isExpanded) {
	// expansion button in the group header
	if (childCount == 0) {
	mToggleIcon.setVisibility(View.GONE);
	return;
	}
	mToggleIcon.setVisibility(View.VISIBLE);
	mToggleIcon.setImageDrawable(isExpanded ? mCollapseDrawable : mExpandDrawable);

	// Don't allow most controls to be focused when collapsed.
	mNotificationListView.setDescendantFocusability(isExpanded
	? ViewGroup.FOCUS_BEFORE_DESCENDANTS : ViewGroup.FOCUS_BLOCK_DESCENDANTS);
	mNotificationListView.setFocusable(false);
	mGroupHeaderView.setFocusable(isExpanded);
	mExpansionFooterView.setFocusable(isExpanded);

	// expansion button in the group footer
	if (isExpanded) {
	mExpansionFooterView.setText(mContext.getString(R.string.show_less));
	hideDismissButton();
	return;
	}

	int unshownCount = childCount - 2;
	mExpansionFooterView.setText(
	unshownCount <= 0
	? mContext.getString(R.string.show_more)
	: mContext.getString(R.string.show_count_more, unshownCount));
	updateDismissButton(getAlertEntry(), /* isHeadsUp= */ false);
	}

	private void updateOnClickListener(
	CarNotificationViewAdapter parentAdapter, NotificationGroup group, boolean isExpanded) {

	View.OnClickListener expansionClickListener = view -> {
	boolean isExpanding = !isExpanded;
	parentAdapter.setExpanded(group.getGroupKey(), isExpanding);
	mAdapter.notifyDataSetChanged();
	};

	if (isExpanded) {
	mCardView.setOnClickListener(null);
	mCardView.setClickable(false);
	mCardView.setFocusable(false);
	} else {
	mCardView.setOnClickListener(expansionClickListener);
	}
	mGroupHeaderView.setOnClickListener(expansionClickListener);
	mExpansionFooterView.setOnClickListener(expansionClickListener);
	mTouchInterceptorView.setOnClickListener(expansionClickListener);
	mTouchInterceptorView.setVisibility(isExpanded ? View.GONE : View.VISIBLE);
	}

	@Override
	public boolean isDismissible() {
	return mNotificationGroup == null \|\| mNotificationGroup.isDismissible();
	}

	@Override
	void reset() {
	super.reset();
	mCardView.setOnClickListener(null);
	mGroupHeaderView.reset();
	}

	@Override
	public void onUxRestrictionsChanged(CarUxRestrictions restrictionInfo) {
	mAdapter.setCarUxRestrictions(mAdapter.getCarUxRestrictions());
	}

	private class GroupedNotificationItemDecoration extends RecyclerView.ItemDecoration {

	@Override
	public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {
	// not drawing the divider for the last item
	for (int i = 0; i < parent.getChildCount() - 1; i++) {
	drawDivider(c, parent.getChildAt(i));
	}
	}

	/**
	* Draws a divider under {@code container}.
	*/
	private void drawDivider(Canvas c, View container) {
	int left = container.getLeft();
	int right = container.getRight();
	int bottom = container.getBottom() + mDividerHeight;
	int top = bottom - mDividerHeight;

	c.drawRect(left, top, right, bottom, mPaint);
	}
	}
	}