com.goforer.base.ui.view.SwipeViewPager.java Source code

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Here is the source code for com.goforer.base.ui.view.SwipeViewPager.java

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/*
 * Copyright (C) 2016 Lukoh Nam, goForer
 *
 * 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.goforer.base.ui.view;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;

public class SwipeViewPager extends ViewPager {
    float mStartDragX;
    OnSwipeOutListener mListener;

    public SwipeViewPager(Context context) {
        super(context);
    }

    public SwipeViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void setOnSwipeOutListener(OnSwipeOutListener listener) {
        mListener = listener;
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        float x = ev.getX();
        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            mStartDragX = x;
            break;
        case MotionEvent.ACTION_MOVE:
            if (mStartDragX < x && getCurrentItem() == 0) {
                mListener.onSwipeOutAtStart();
            } else if (mStartDragX > x && getCurrentItem() == getAdapter().getCount() - 1) {
                mListener.onSwipeOutAtEnd();
            }
            break;
        }
        try {
            return super.onInterceptTouchEvent(ev);
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
            return false;
        }
    }

    public interface OnSwipeOutListener {
        void onSwipeOutAtStart();

        void onSwipeOutAtEnd();
    }
}