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