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egroupware_official/etemplate/js/et2_extension_nextmatch_dynheight.js
2013-02-22 16:01:28 +00:00

167 lines
4.3 KiB
JavaScript

/**
* eGroupWare eTemplate2 - JS Dynheight object
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @subpackage api
* @link http://www.egroupware.org
* @author Andreas Stöckel
* @copyright Stylite 2011
* @version $Id$
*/
"use strict"
/*egw:use
jquery.jquery;
et2_core_inheritance;
*/
/**
* Object which resizes an inner node to the maximum extend of an outer node
* (without creating a scrollbar) - it achieves that by performing some very
* nasty and time consuming calculations.
*/
var et2_dynheight = Class.extend({
/**
* Constructor for the dynheight object
*
* @param _outerNode is the node which surrounds the _innerNode and to
* which extend the innerNode should be expanded without creating a
* scrollbar. Note: The outer node must be a parent of the inner node.
* @param _innerNode is the node which should be scaled. Call update to
* scale the node.
* @param _minHeight is the minimum height the inner node should have
*/
init: function(_outerNode, _innerNode, _minHeight) {
this.outerNode = $j(_outerNode);
this.innerNode = $j(_innerNode);
this.minHeight = _minHeight;
this.bottomNodes = [];
this.initialized = false;
this.innerMargin = 0;
this.outerMargin = 0;
},
/**
* Resizes the inner node. When this is done, the callback function is
* called.
*/
update: function(_callback, _context) {
// Check whether the inner node is actually visible - if not, don't
// trigger the callback function
if (this.innerNode.is(":visible"))
{
// Initialize the height calculation
this._initialize();
// Get the outer container height and offset, if available
var oh = this.outerNode.height();
var ot = this.outerNode.offset() ? this.outerNode.offset().top : 0;
// Get top and height of the inner node
var it = this.innerNode.offset().top;
// Calculate the height of the "bottomNodes"
var bminTop = 0;
var bmaxBot = 0;
for (var i = 0; i < this.bottomNodes.length; i++)
{
// Get height, top and bottom and calculate the maximum/minimum
var bh = this.bottomNodes[i].outerHeight(true);
var bt = this.bottomNodes[i].offset().top;
var bb = bh + bt;
if (i == 0 || bminTop > bt)
{
bminTop = bt;
}
if (i == 0 || bmaxBot < bb)
{
bmaxBot = bb;
}
}
// Get the height of the bottom container
var bh = bmaxBot - bminTop;
// Calculate the new height of the inner container
var w = this.innerNode.width();
var h = Math.max(this.minHeight, oh + ot - it - bh -
this.innerMargin - this.outerMargin);
this.innerNode.height(h);
// Call the callback function
if (typeof _callback != "undefined")
{
_callback.call(_context, w, h);
}
}
},
/**
* Function used internally which collects all DOM-Nodes which are located
* below this element.
*/
_collectBottomNodes: function(_node, _bottom) {
// Calculate the bottom position of the inner node
if (typeof _bottom == "undefined")
{
_bottom = this.innerNode.offset().top + this.innerNode.height();
}
if (_node)
{
// Accumulate the outer margin of the parent elements
var node = $j(_node);
var ooh = node.outerHeight(true);
var oh = node.height();
this.outerMargin += (ooh - oh) / 2; // Divide by 2 as the value contains margin-top and -bottom
// Iterate over the children of the given node and do the same
// recursively to the parent nodes until the _outerNode or body is
// reached.
var self = this;
$j(_node).children().each(function() {
var $this = $j(this);
var top = $this.offset().top;
if (this != self.innerNode[0] && top > _bottom)
{
self.bottomNodes.push($this);
}
});
if (_node != this.outerNode[0] && _node != $j("body")[0])
{
this._collectBottomNodes(_node.parentNode, _bottom);
}
}
},
/**
* Used internally to calculate some information which will not change over
* the time.
*/
_initialize: function() {
if (!this.initialized)
{
// Collect all bottomNodes and calculates the outer margin
this.bottomNodes = [];
this.outerMargin = 0;
this._collectBottomNodes(this.innerNode[0].parentNode);
// Calculate the inner margin
var ioh = this.innerNode.outerHeight(true);
var ih = this.innerNode.height();
this.innerMargin = ioh - ih;
this.initialized = true;
}
}
});