RubyLouvre/avalon

import { avalon } from '../../seed/core'
import { getWindow } from './share'


avalon.fn.offset = function () { //取得距离页面左右角的坐标
    var node = this[0]
    try {
        var rect = node.getBoundingClientRect()
        // Make sure element is not hidden (display: none) or disconnected
        // https://github.com/jquery/jquery/pull/2043/files#r23981494
        if (rect.width || rect.height || node.getClientRects().length) {
            var doc = node.ownerDocument
            var root = doc.documentElement
            var win = doc.defaultView
            return {
                top: rect.top + win.pageYOffset - root.clientTop,
                left: rect.left + win.pageXOffset - root.clientLeft
            }
        }
    } catch (e) {
        return {
            left: 0,
            top: 0
        }
    }
}

avalon.each({
    scrollLeft: "pageXOffset",
    scrollTop: "pageYOffset"
}, function (method, prop) {
    avalon.fn[method] = function (val) {
        var node = this[0] || {}
        var win = getWindow(node)
        var top = method === "scrollTop"
        if (!arguments.length) {
            return win ? win[prop] : node[method]
        } else {
            if (win) {
                win.scrollTo(!top ? val : win[prop], top ? val : win[prop])
            } else {
                node[method] = val
            }
        }
    }
})

function getWindow(node) {
    return node.window || node.defaultView || false
}