angular-cached-resource
Version:
An AngularJS module to interact with RESTful resources, even when browser is offline
191 lines • 7.43 kB
JavaScript
/**
* angular-strap
* @version v2.0.1 - 2014-04-10
* @link http://mgcrea.github.io/angular-strap
* @author Olivier Louvignes (olivier@mg-crea.com)
* @license MIT License, http://www.opensource.org/licenses/MIT
*/
'use strict';
angular.module('mgcrea.ngStrap.affix', [
'mgcrea.ngStrap.helpers.dimensions',
'mgcrea.ngStrap.helpers.debounce'
]).provider('$affix', function () {
var defaults = this.defaults = { offsetTop: 'auto' };
this.$get = [
'$window',
'debounce',
'dimensions',
function ($window, debounce, dimensions) {
var bodyEl = angular.element($window.document.body);
var windowEl = angular.element($window);
function AffixFactory(element, config) {
var $affix = {};
// Common vars
var options = angular.extend({}, defaults, config);
var targetEl = options.target;
// Initial private vars
var reset = 'affix affix-top affix-bottom', initialAffixTop = 0, initialOffsetTop = 0, offsetTop = 0, offsetBottom = 0, affixed = null, unpin = null;
var parent = element.parent();
// Options: custom parent
if (options.offsetParent) {
if (options.offsetParent.match(/^\d+$/)) {
for (var i = 0; i < options.offsetParent * 1 - 1; i++) {
parent = parent.parent();
}
} else {
parent = angular.element(options.offsetParent);
}
}
$affix.init = function () {
$affix.$parseOffsets();
initialOffsetTop = dimensions.offset(element[0]).top + initialAffixTop;
// Bind events
targetEl.on('scroll', $affix.checkPosition);
targetEl.on('click', $affix.checkPositionWithEventLoop);
windowEl.on('resize', $affix.$debouncedOnResize);
// Both of these checkPosition() calls are necessary for the case where
// the user hits refresh after scrolling to the bottom of the page.
$affix.checkPosition();
$affix.checkPositionWithEventLoop();
};
$affix.destroy = function () {
// Unbind events
targetEl.off('scroll', $affix.checkPosition);
targetEl.off('click', $affix.checkPositionWithEventLoop);
windowEl.off('resize', $affix.$debouncedOnResize);
};
$affix.checkPositionWithEventLoop = function () {
setTimeout($affix.checkPosition, 1);
};
$affix.checkPosition = function () {
// if (!this.$element.is(':visible')) return
var scrollTop = getScrollTop();
var position = dimensions.offset(element[0]);
var elementHeight = dimensions.height(element[0]);
// Get required affix class according to position
var affix = getRequiredAffixClass(unpin, position, elementHeight);
// Did affix status changed this last check?
if (affixed === affix)
return;
affixed = affix;
// Add proper affix class
element.removeClass(reset).addClass('affix' + (affix !== 'middle' ? '-' + affix : ''));
if (affix === 'top') {
unpin = null;
element.css('position', options.offsetParent ? '' : 'relative');
element.css('top', '');
} else if (affix === 'bottom') {
if (options.offsetUnpin) {
unpin = -(options.offsetUnpin * 1);
} else {
// Calculate unpin threshold when affixed to bottom.
// Hopefully the browser scrolls pixel by pixel.
unpin = position.top - scrollTop;
}
element.css('position', options.offsetParent ? '' : 'relative');
element.css('top', options.offsetParent ? '' : bodyEl[0].offsetHeight - offsetBottom - elementHeight - initialOffsetTop + 'px');
} else {
// affix === 'middle'
unpin = null;
element.css('position', 'fixed');
element.css('top', initialAffixTop + 'px');
}
};
$affix.$onResize = function () {
$affix.$parseOffsets();
$affix.checkPosition();
};
$affix.$debouncedOnResize = debounce($affix.$onResize, 50);
$affix.$parseOffsets = function () {
// Reset position to calculate correct offsetTop
element.css('position', options.offsetParent ? '' : 'relative');
if (options.offsetTop) {
if (options.offsetTop === 'auto') {
options.offsetTop = '+0';
}
if (options.offsetTop.match(/^[-+]\d+$/)) {
initialAffixTop = -options.offsetTop * 1;
if (options.offsetParent) {
offsetTop = dimensions.offset(parent[0]).top + options.offsetTop * 1;
} else {
offsetTop = dimensions.offset(element[0]).top - dimensions.css(element[0], 'marginTop', true) + options.offsetTop * 1;
}
} else {
offsetTop = options.offsetTop * 1;
}
}
if (options.offsetBottom) {
if (options.offsetParent && options.offsetBottom.match(/^[-+]\d+$/)) {
// add 1 pixel due to rounding problems...
offsetBottom = getScrollHeight() - (dimensions.offset(parent[0]).top + dimensions.height(parent[0])) + options.offsetBottom * 1 + 1;
} else {
offsetBottom = options.offsetBottom * 1;
}
}
};
// Private methods
function getRequiredAffixClass(unpin, position, elementHeight) {
var scrollTop = getScrollTop();
var scrollHeight = getScrollHeight();
if (scrollTop <= offsetTop) {
return 'top';
} else if (unpin !== null && scrollTop + unpin <= position.top) {
return 'middle';
} else if (offsetBottom !== null && position.top + elementHeight + initialAffixTop >= scrollHeight - offsetBottom) {
return 'bottom';
} else {
return 'middle';
}
}
function getScrollTop() {
return targetEl[0] === $window ? $window.pageYOffset : targetEl[0] === $window;
}
function getScrollHeight() {
return targetEl[0] === $window ? $window.document.body.scrollHeight : targetEl[0].scrollHeight;
}
$affix.init();
return $affix;
}
return AffixFactory;
}
];
}).directive('bsAffix', [
'$affix',
'$window',
function ($affix, $window) {
return {
restrict: 'EAC',
require: '^?bsAffixTarget',
link: function postLink(scope, element, attr, affixTarget) {
var options = {
scope: scope,
offsetTop: 'auto',
target: affixTarget ? affixTarget.$element : angular.element($window)
};
angular.forEach([
'offsetTop',
'offsetBottom',
'offsetParent',
'offsetUnpin'
], function (key) {
if (angular.isDefined(attr[key]))
options[key] = attr[key];
});
var affix = $affix(element, options);
scope.$on('$destroy', function () {
options = null;
affix = null;
});
}
};
}
]).directive('bsAffixTarget', function () {
return {
controller: [
'$element',
function ($element) {
this.$element = $element;
}
]
};
});