// $Id: textarea.js,v 1.22 2008/01/17 19:31:56 goba Exp $

Drupal.behaviors.textarea = function(context) {

  $('textarea.resizable:not(.textarea-processed)', context).each(function() {

    // Avoid non-processed teasers.

    if ($(this).is(('textarea.teaser:not(.teaser-processed)'))) {

      return false;  

    }

    var textarea = $(this).addClass('textarea-processed'), staticOffset = null;

    // When wrapping the text area, work around an IE margin bug.  See:

    // http://jaspan.com/ie-inherited-margin-bug-form-elements-and-haslayout

    $(this).wrap('<div class="resizable-textarea"><span></span></div>')

      .parent().append($('<div class="grippie"></div>').mousedown(startDrag));

    var grippie = $('div.grippie', $(this).parent())[0];

    grippie.style.marginRight = (grippie.offsetWidth - $(this)[0].offsetWidth) +'px';

    function startDrag(e) {

      staticOffset = textarea.height() - e.pageY;

      textarea.css('opacity', 0.25);

      $(document).mousemove(performDrag).mouseup(endDrag);

      return false;

    }

    function performDrag(e) {

      textarea.height(Math.max(32, staticOffset + e.pageY) + 'px');

      return false;

    }

    function endDrag(e) {

      $(document).unbind("mousemove", performDrag).unbind("mouseup", endDrag);

      textarea.css('opacity', 1);

    }

  });

};