package com.wpc.library.widget;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.widget.Gallery;

public class CustomGallery extends Gallery {
	private float mLastMotionX;// 初始x坐标
	private float mLastMotionY;// 初始y坐标
	private int mTouchSlop;// 触摸最短距离

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

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

	public CustomGallery(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);

	}

	public boolean onInterceptTouchEvent(MotionEvent ev) {
		final ViewConfiguration configuration = ViewConfiguration
				.get(getContext());
		mTouchSlop = configuration.getScaledTouchSlop();// 触摸最短距离
		final int action = ev.getAction();
		// x坐标
		final float x = ev.getX();// 每次触摸发生变化的低吼都会记录下坐标
		// y坐标
		final float y = ev.getY();// 每次触摸发生变化的低吼都会记录下坐标
		switch (action) {
		case MotionEvent.ACTION_DOWN:// 记录初始位置
			mLastMotionX = x;
			mLastMotionY = y;
			break;
		case MotionEvent.ACTION_MOVE:
			// 此时的xy是手指离开时的位置坐标
			final int deltaX = (int) (mLastMotionX - x);// 水平方向滑动距离
			final int deltaY = (int) (mLastMotionY - y);// 垂直方向滑动距离

			if (Math.abs(deltaX) > mTouchSlop
					&& Math.abs(deltaY) < Math.abs(deltaX)) {// 表明是横向滑动交给，Gallery
				return true;
			}
			break;
		}
		return false;
	}
}