yjfc_xinxi/ckfinder/plugins/fileeditor/codemirror/js/select.js

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/* Functionality for finding, storing, and restoring selections
 *
 * This does not provide a generic API, just the minimal functionality
 * required by the CodeMirror system.
 */

// Namespace object.
var select = {};

(function() {
  select.ie_selection = document.selection && document.selection.createRangeCollection;

  // Find the 'top-level' (defined as 'a direct child of the node
  // passed as the top argument') node that the given node is
  // contained in. Return null if the given node is not inside the top
  // node.
  function topLevelNodeAt(node, top) {
    while (node && node.parentNode != top)
      node = node.parentNode;
    return node;
  }

  // Find the top-level node that contains the node before this one.
  function topLevelNodeBefore(node, top) {
    while (!node.previousSibling && node.parentNode != top)
      node = node.parentNode;
    return topLevelNodeAt(node.previousSibling, top);
  }

  var fourSpaces = "\u00a0\u00a0\u00a0\u00a0";

  select.scrollToNode = function(element) {
    if (!element) return;
    var doc = element.ownerDocument, body = doc.body,
        win = (doc.defaultView || doc.parentWindow),
        html = doc.documentElement,
        atEnd = !element.nextSibling || !element.nextSibling.nextSibling
                || !element.nextSibling.nextSibling.nextSibling;
    // In Opera (and recent Webkit versions), BR elements *always*
    // have a offsetTop property of zero.
    var compensateHack = 0;
    while (element && !element.offsetTop) {
      compensateHack++;
      element = element.previousSibling;
    }
    // atEnd is another kludge for these browsers -- if the cursor is
    // at the end of the document, and the node doesn't have an
    // offset, just scroll to the end.
    if (compensateHack == 0) atEnd = false;

    var y = compensateHack * (element ? element.offsetHeight : 0), x = 0, pos = element;
    while (pos && pos.offsetParent) {
      y += pos.offsetTop;
      // Don't count X offset for <br> nodes
      if (!isBR(pos))
        x += pos.offsetLeft;
      pos = pos.offsetParent;
    }

    var scroll_x = body.scrollLeft || html.scrollLeft || 0,