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// $Id$
(function ($) {
/**
* Provides a generic method to position elements fixed to the viewport.
*
* Fixed positioning (CSS declaration position:fixed) is done relative to the
* viewport. This makes it hard to position multiple fixed positioned element
* relative to each other (e.g. multiple toolbars should come after each other,
* not on top of each other).
*
* To position an element fixed at the top of the viewport add the class
* "displace-top" to that element, and to position it to the bottom of the view-
* port add the class "displace-bottom".
*
* When a browser doesn't support position:fixed (like IE6) the element gets
* positioned absolutely by default, but this can be overridden by using the
* "displace-unsupported" class.
*/
/**
* Attaches the displace behavior.
*/
Drupal.behaviors.displace = {
attach: function (context, settings) {
// Test for position:fixed support.
if (!Drupal.positionFixedSupported()) {
$(document.documentElement).addClass('displace-unsupported');
}
$(document.body).once('displace', function () {
$(window).bind('resize.drupal-displace', function () {
Drupal.displace.clearCache();
$(document.body).css({
paddingTop: Drupal.displace.getDisplacement('top'),
paddingBottom: Drupal.displace.getDisplacement('bottom')
});
});
});
Drupal.displace.clearCache(true);
$(window).triggerHandler('resize');
}
};
/**
* The displace object.
*/
Drupal.displace = Drupal.displace || {};
Drupal.displace.elements = [];
Drupal.displace.displacement = [];
/**
* Get all displaced elements of given region.
*
* @param region
* Region name. Either "top" or "bottom".
*
* @return
* jQuery object containing all displaced elements of given region.
*/
Drupal.displace.getDisplacedElements = function (region) {
if (!this.elements[region]) {
this.elements[region] = $('.displace-' + region);
}
return this.elements[region];
};
/**
* Get the total displacement of given region.
*
* @param region
* Region name. Either "top" or "bottom".
*
* @return
* The total displacement of given region in pixels.
*/
Drupal.displace.getDisplacement = function (region) {
if (!this.displacement[region]) {
var offset = 0;
var height = 0;
this.getDisplacedElements(region).each(function () {
offset = offset + height;
height = $(this).css(region, offset).outerHeight();
// In IE, Shadow filter adds some extra height, so we need to remove it
// from the returned height.
if (this.filters && this.filters.length && this.filters.item('DXImageTransform.Microsoft.Shadow')) {
height -= this.filters.item('DXImageTransform.Microsoft.Shadow').strength;
}
});
// Use offset of latest displaced element as the total displacement.
this.displacement[region] = offset + height;
}
return this.displacement[region];
};
/**
* Clear cache.
*
* @param selectorCache
* Boolean whether to also clear the selector cache.
*/
Drupal.displace.clearCache = function (selectorCache) {
if (selectorCache) {
this.elements = [];
}
this.displacement = [];
};
})(jQuery);
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