cn.org.eshow.framwork.view.sample.AbInnerViewPager.java Source code

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Here is the source code for cn.org.eshow.framwork.view.sample.AbInnerViewPager.java

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/*
 * Copyright (C) 2012 www.amsoft.cn
 * 
 * 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 cn.org.eshow.framwork.view.sample;

import android.content.Context;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.widget.ListView;
import android.widget.ScrollView;

// TODO: Auto-generated Javadoc
/**
 * ViewPager?ViewListscrollView
 * ?View?
 *
 */
public class AbInnerViewPager extends ViewPager {

    /** The parent scroll view. */
    private ScrollView parentScrollView;

    /** The parent list view. */
    private ListView parentListView;

    /** The m gesture detector. */
    private GestureDetector mGestureDetector;

    /**
     * ?ViewPager.
     *
     * @param context the context
     */
    public AbInnerViewPager(Context context) {
        super(context);
        mGestureDetector = new GestureDetector(new YScrollDetector());
        setFadingEdgeLength(0);
    }

    /**
     * ?ViewPager.
     *
     * @param context the context
     * @param attrs the attrs
     */
    public AbInnerViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
        mGestureDetector = new GestureDetector(new YScrollDetector());
        setFadingEdgeLength(0);
    }

    /**
     * ??.
     *
     * @param ev the ev
     * @return true, if successful
     */
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        return super.onInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);
    }

    /**
     * View.
     *
     * @param flag ?
     */
    private void setParentScrollAble(boolean flag) {
        if (parentScrollView != null) {
            parentScrollView.requestDisallowInterceptTouchEvent(!flag);
        }

        if (parentListView != null) {
            parentListView.requestDisallowInterceptTouchEvent(!flag);
        }

    }

    /**
     * ScrollView?.
     *
     * @param parentScrollView the new parent scroll view
     */
    public void setParentScrollView(ScrollView parentScrollView) {
        this.parentScrollView = parentScrollView;
    }

    /**
     * ListView?.
     *
     * @param parentListView the new parent scroll view
     */
    public void setParentListView(ListView parentListView) {
        this.parentListView = parentListView;
    }

    /**
     * The Class YScrollDetector.
     */
    class YScrollDetector extends SimpleOnGestureListener {

        /* (non-Javadoc)
         * @see android.view.GestureDetector.SimpleOnGestureListener#onScroll(android.view.MotionEvent, android.view.MotionEvent, float, float)
         */
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {

            if (Math.abs(distanceX) >= Math.abs(distanceY)) {
                //?
                setParentScrollAble(false);
                return true;
            } else {
                setParentScrollAble(true);
            }
            return false;
        }
    }

}