net.soulwolf.meetrecycle.SimpleClickListener.java Source code

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Here is the source code for net.soulwolf.meetrecycle.SimpleClickListener.java

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/*
 * Copyright 2015 Soulwolf Ching
 *
 * 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 net.soulwolf.meetrecycle;

import android.support.annotation.Nullable;
import android.support.v4.view.GestureDetectorCompat;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by Soulwolf on 2016/8/03.
 * <p>
 * This can be useful for applications that wish to implement various forms of click and longclick and childView click
 * manipulation of item views within the RecyclerView. SimpleClickListener may intercept
 * a touch interaction already in progress even if the SimpleClickListener is already handling that
 * gesture stream itself for the purposes of scrolling.
 *
 * @see RecyclerView.OnItemTouchListener
 */
public abstract class SimpleClickListener
        implements RecyclerView.OnItemTouchListener, GestureDetector.OnGestureListener {

    private GestureDetectorCompat mGestureDetector;
    private RecyclerView mRecyclerView;

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        if (mRecyclerView == null) {
            this.mRecyclerView = rv;
            this.mGestureDetector = new GestureDetectorCompat(rv.getContext(), this);
        }
        this.mGestureDetector.onTouchEvent(e);
        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {
    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
    }

    @Override
    public boolean onDown(MotionEvent e) {
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {
        View view = getChildViewUnder(e);
        if (view != null) {
            view.setPressed(true);
        }
    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        View view = getChildViewUnder(e);
        if (view == null)
            return false;
        view.setPressed(false);
        int position = shiftAdjustInt(mRecyclerView.getChildAdapterPosition(view));
        if (position != -1) {
            this.onItemClick(mRecyclerView, view, position);
        }
        return true;
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e) {
        View view = getChildViewUnder(e);
        if (view == null)
            return;
        int position = shiftAdjustInt(mRecyclerView.getChildAdapterPosition(view));
        if (position != -1) {
            this.onItemLongClick(mRecyclerView, view, position);
        }
        view.setPressed(false);
    }

    private int shiftAdjustInt(int position) {
        RecyclerView.Adapter adapter = mRecyclerView.getAdapter();
        if (adapter != null && adapter instanceof PositionAdjustShift) {
            return ((PositionAdjustShift) adapter).shiftAdjustPosition(position);
        }
        return position;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        return false;
    }

    @Nullable
    private View getChildViewUnder(MotionEvent e) {
        return mRecyclerView.findChildViewUnder(e.getX(), e.getY());
    }

    public abstract void onItemClick(RecyclerView parent, View clickedView, int position);

    public abstract void onItemLongClick(RecyclerView parent, View clickedView, int position);
}