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import utils from './utils';
import getOffsetParent from './getOffsetParent';
import isAncestorFixed from './isAncestorFixed';
/**
* 获得元素的显示部分的区域
*/
function getVisibleRectForElement(element) {
var visibleRect = {
left: 0,
right: Infinity,
top: 0,
bottom: Infinity
};
var el = getOffsetParent(element);
var doc = utils.getDocument(element);
var win = doc.defaultView || doc.parentWindow;
var body = doc.body;
var documentElement = doc.documentElement;
// Determine the size of the visible rect by climbing the dom accounting for
// all scrollable containers.
while (el) {
// clientWidth is zero for inline block elements in ie.
if ((navigator.userAgent.indexOf('MSIE') === -1 || el.clientWidth !== 0) &&
// body may have overflow set on it, yet we still get the entire
// viewport. In some browsers, el.offsetParent may be
// document.documentElement, so check for that too.
el !== body && el !== documentElement && utils.css(el, 'overflow') !== 'visible') {
var pos = utils.offset(el);
// add border
pos.left += el.clientLeft;
pos.top += el.clientTop;
visibleRect.top = Math.max(visibleRect.top, pos.top);
visibleRect.right = Math.min(visibleRect.right,
// consider area without scrollBar
pos.left + el.clientWidth);
visibleRect.bottom = Math.min(visibleRect.bottom, pos.top + el.clientHeight);
visibleRect.left = Math.max(visibleRect.left, pos.left);
} else if (el === body || el === documentElement) {
break;
}
el = getOffsetParent(el);
}
// Set element position to fixed
// make sure absolute element itself don't affect it's visible area
// https://github.com/ant-design/ant-design/issues/7601
var originalPosition = null;
if (!utils.isWindow(element) && element.nodeType !== 9) {
originalPosition = element.style.position;
var position = utils.css(element, 'position');
if (position === 'absolute') {
element.style.position = 'fixed';
}
}
var scrollX = utils.getWindowScrollLeft(win);
var scrollY = utils.getWindowScrollTop(win);
var viewportWidth = utils.viewportWidth(win);
var viewportHeight = utils.viewportHeight(win);
var documentWidth = documentElement.scrollWidth;
var documentHeight = documentElement.scrollHeight;
// scrollXXX on html is sync with body which means overflow: hidden on body gets wrong scrollXXX.
// We should cut this ourself.
var bodyStyle = window.getComputedStyle(body);
if (bodyStyle.overflowX === 'hidden') {
documentWidth = win.innerWidth;
}
if (bodyStyle.overflowY === 'hidden') {
documentHeight = win.innerHeight;
}
// Reset element position after calculate the visible area
if (element.style) {
element.style.position = originalPosition;
}
if (isAncestorFixed(element)) {
// Clip by viewport's size.
visibleRect.left = Math.max(visibleRect.left, scrollX);
visibleRect.top = Math.max(visibleRect.top, scrollY);
visibleRect.right = Math.min(visibleRect.right, scrollX + viewportWidth);
visibleRect.bottom = Math.min(visibleRect.bottom, scrollY + viewportHeight);
} else {
// Clip by document's size.
var maxVisibleWidth = Math.max(documentWidth, scrollX + viewportWidth);
visibleRect.right = Math.min(visibleRect.right, maxVisibleWidth);
var maxVisibleHeight = Math.max(documentHeight, scrollY + viewportHeight);
visibleRect.bottom = Math.min(visibleRect.bottom, maxVisibleHeight);
}
return visibleRect.top >= 0 && visibleRect.left >= 0 && visibleRect.bottom > visibleRect.top && visibleRect.right > visibleRect.left ? visibleRect : null;
}
export default getVisibleRectForElement;