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angular-stellar.js
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angular-stellar.js
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/*! tomchentw-boilerplate - v 0.2.6 - Fri Jan 17 2014 19:05:42 GMT+0800 (CST)
* https://github.com/tomchentw/angular-stellar
* Copyright (c) 2014 [tomchentw](https://github.com/tomchentw/);
* Licensed [MIT](http:https://tomchentw.mit-license.org/)
*//*global angular:false*/
(function(){
var bind, noop, extend, delayInFPS, $requestAnimationFrame, stellarConfig, Target, $css, $vendorPrefix, stellarTarget, stellarBackgroundRatio, stellarRatio;
bind = angular.bind, noop = angular.noop, extend = angular.extend;
delayInFPS = 1000 / 60;
$requestAnimationFrame = ['$window', '$log'].concat(function($window, $log){
var NAMES, i$, len$, name, that;
NAMES = ['request', 'webkitRequest', 'mozRequest', 'oRequest', 'msRequest'];
for (i$ = 0, len$ = NAMES.length; i$ < len$; ++i$) {
name = NAMES[i$];
if (that = $window[name + "AnimationFrame"]) {
return bind($window, that);
}
}
$log.warn('Can\'t find requestAnimationFrame in your browser. Use polyfill.');
return function(it){
return $window.setTimeout(it, delayInFPS);
};
});
stellarConfig = {
scrollProperty: 'scroll',
positionProperty: 'position',
horizontalScrolling: true,
verticalScrolling: true,
horizontalOffset: 0,
verticalOffset: 0,
hideDistantElements: true,
hideElement: function(it){
it.addClass('ng-hide');
},
showElement: function(it){
it.removeClass('ng-hide');
},
isElementHidden: function(it){
return it.hasClass('ng-hide');
}
};
Target = (function(){
Target.displayName = 'Target';
var prototype = Target.prototype, constructor = Target;
Target._lastTime = 0;
Target._targets = [];
Target.getInstance = function(name, $element){
return Target[name] || new Target(name, $element);
};
Target.handleUpdate = function(timestamp){
var justUpdated, rescheduled, i$, ref$, len$, target;
justUpdated = timestamp - this._lastTime < delayInFPS;
if (justUpdated) {
return true;
}
this._lastTime = timestamp;
rescheduled = false;
for (i$ = 0, len$ = (ref$ = this._targets).length; i$ < len$; ++i$) {
target = ref$[i$];
if (target.handleUpdate() && !rescheduled) {
rescheduled = true;
}
}
return rescheduled;
};
function Target(name, $element){
constructor[name] = this;
constructor._targets.push(this);
this._$element = $element;
this._callbacks = [];
this._props = {};
}
prototype.addCallbak = function(it){
var index;
index = -1 + this._callbacks.push(it);
return bind(this._callbacks, this._callbacks.splice, index);
};
prototype.handleUpdate = function(){
var updated, i$, ref$, len$, callback;
updated = this.getOffset();
updated.scrollTop = this.getTop();
updated.scrollLeft = this.getLeft();
if (angular.equals(updated, this._props)) {
return;
}
extend(this._props, updated);
for (i$ = 0, len$ = (ref$ = this._callbacks).length; i$ < len$; ++i$) {
callback = ref$[i$];
callback(this._props);
}
};
prototype.handleWebkitBug = function(){
var ref$, scrollTop, scrollLeft;
ref$ = this._props, scrollTop = ref$.scrollTop, scrollLeft = ref$.scrollLeft;
this.setTop(scrollTop + 1);
this.setLeft(scrollLeft + 1);
this.setTop(scrollTop);
this.setLeft(scrollLeft);
};
prototype.getLeft = function(){
return this._$element.prop('scrollLeft');
};
prototype.setLeft = function(it){
this._$element.prop('scrollLeft', it);
};
prototype.getTop = function(){
return this._$element.prop('scrollTop');
};
prototype.setTop = function(it){
this._$element.prop('scrollTop', it);
};
return Target;
}());
$css = ['$window'].concat(function($window){
return function($element, cssprop){
var el, style;
el = $element[0];
style = el.currentStyle
? el.currentStyle
: $window.getComputedStyle
? $window.getComputedStyle(el)
: el.style;
if (cssprop) {
return style[cssprop];
} else {
return style;
}
};
});
$vendorPrefix = ['$css'].concat(function($css){
var VENDORS, name, that, prefix;
VENDORS = /^(moz|webkit|khtml|o|ms)(?=[A-Z])/;
for (name in $css(angular.element('<script></script>'))) {
if (that = name.match(VENDORS)) {
prefix = that[0];
break;
}
}
return function(cssprop){
return prefix + (!prefix
? cssprop
: angular.uppercase(cssprop.charAt(0)) + "" + cssprop.slice(1));
};
});
stellarTarget = ['$window', '$document', '$position', '$requestAnimationFrame', '$css', '$vendorPrefix', 'stellarConfig'].concat(function($window, $document, $position, $requestAnimationFrame, $css, $vendorPrefix, stellarConfig){
var windowTarget, documentTarget, scrollProperty, schedule;
windowTarget = Target.getInstance('window', angular.element($window));
documentTarget = Target.getInstance('document', $document);
windowTarget.getOffset = documentTarget.getOffset = function(){
var docEl;
docEl = $document[0].documentElement;
return {
height: docEl.clientHeight,
width: docEl.clientWidth,
top: 0,
left: 0
};
};
windowTarget.getLeft = documentTarget.getLeft = function(){
return $window.pageXOffset;
};
windowTarget.getTop = documentTarget.getTop = function(){
return $window.pageYOffset;
};
windowTarget.setLeft = documentTarget.setLeft = function(it){
$window.scrollTo(it, $window.pageYOffset);
};
windowTarget.setTop = documentTarget.setLeft = function(it){
$window.scrollTo($window.pageXOffset, it);
};
scrollProperty = stellarConfig.scrollProperty;
extend(Target.prototype, {
getOffset: function(){
return $position.offset(this._$element);
}
}, angular.isObject(scrollProperty)
? scrollProperty
: (function(){
var cssInt, prefixedTransform;
cssInt = function($element, cssprop){
return parseInt($css($element, cssprop), 10);
};
prefixedTransform = $vendorPrefix('transform');
switch (scrollProperty) {
case 'position':
return {
getLeft: function(){
return -1 * cssInt(this._$element, 'left');
},
getTop: function(){
return -1 * cssInt(this._$element, 'top');
}
};
case 'margin':
return {
getLeft: function(){
return -1 * cssInt(this._$element, 'marginLeft');
},
getTop: function(){
return -1 * cssInt(this._$element, 'marginTop');
}
};
case 'transform':
return {
getLeft: function(){
var transform;
transform = $css(this._$element, prefixedTransform);
if ('none' === transform) {
return 0;
} else {
return -1 * parseInt(transform.match(/(-?[0-9]+)/g)[4], 10);
}
},
getTop: function(){
var transform;
transform = $css(this._$element, prefixedTransform);
if ('none' === transform) {
return 0;
} else {
return -1 * parseInt(transform.match(/(-?[0-9]+)/g)[5], 10);
}
}
};
case 'scroll':
// fallthrough
default:
return {};
}
}.call(this)));
schedule = bind(this, $requestAnimationFrame, function(timestamp){
var reschedule;
reschedule = Target.handleUpdate(timestamp);
if ('scroll' === scrollProperty && !reschedule) {
return;
}
schedule();
});
if (scrollProperty === 'scroll') {
windowTarget._$element.on('scroll resize', schedule);
}
return function(name, $element){
return schedule() && Target.getInstance(name, $element);
};
});
stellarBackgroundRatio = ['$position', '$css', 'stellarTarget'].concat(function($position, $css, stellarTarget){
var getBackgroundPosition, computeRatio;
getBackgroundPosition = function($element){
var bgPos;
bgPos = $css($element, 'backgroundPosition').split(' ');
return [parseInt(bgPos[0], 10), parseInt(bgPos[1], 10)];
};
computeRatio = function($element, $attrs){
var stellarBackgroundRatio, fixedRatioOffset;
stellarBackgroundRatio = $attrs.stellarBackgroundRatio || 1;
fixedRatioOffset = 'fixed' === $css($element, 'backgroundAttachment') ? 0 : 1;
return fixedRatioOffset - stellarBackgroundRatio;
};
return {
restrict: 'A',
link: function($scope, $element, $attrs){
var finalRatio, verticalOffset, horizontalOffset, selfProperties, selfBgPositions, parentProperties;
finalRatio = computeRatio($element, $attrs);
verticalOffset = $attrs.stellarVerticalOffset || stellarConfig.verticalOffset;
horizontalOffset = $attrs.stellarHorizontalOffset || stellarConfig.horizontalOffset;
selfProperties = $position.offset($element);
selfBgPositions = getBackgroundPosition($element);
parentProperties = {
top: 0,
left: 0
};
selfProperties.bgTop = selfBgPositions[1];
selfProperties.bgLeft = selfBgPositions[0];
$scope.$on('$destroy', stellarTarget('window').addCallbak(function(targetProps){
var bgTop, bgLeft;
bgTop = finalRatio * (targetProps.scrollTop + verticalOffset - targetProps.top - selfProperties.top + parentProperties.top - selfProperties.bgTop);
bgLeft = finalRatio * (targetProps.scrollLeft + horizontalOffset - targetProps.left - selfProperties.left + parentProperties.left - selfProperties.bgLeft);
$element.css('background-position', bgLeft + "px " + bgTop + "px");
}));
}
};
});
stellarRatio = ['$css', '$vendorPrefix', '$position', 'stellarConfig', 'stellarTarget'].concat(function($css, $vendorPrefix, $position, stellarConfig, stellarTarget){
var positionProperty, horizontalScrolling, verticalScrolling, setPosition, computeIsFixed, computeRatio;
positionProperty = stellarConfig.positionProperty, horizontalScrolling = stellarConfig.horizontalScrolling, verticalScrolling = stellarConfig.verticalScrolling;
setPosition = angular.isFunction(positionProperty.setPosition)
? positionProperty.setPosition
: (function(){
var prefixedTransform, setTop, setLeft;
prefixedTransform = $vendorPrefix('transform');
switch (positionProperty) {
case 'position':
setTop = function($element, top){
$element.css('top', top);
};
setLeft = function($element, left){
$element.css('left', left);
};
break;
case 'transform':
return function($element, left, startingLeft, top, startingTop){
$element.css(prefixedTransform, "translate3d(" + (left - startingLeft) + "px, " + (top - startingTop) + "px, 0)");
};
}
return function($element, left, startingLeft, top, startingTop){
if (horizontalScrolling) {
setLeft($element, left + "px", startingLeft + "px");
}
if (verticalScrolling) {
setTop($element, top + "px", startingTop + "px");
}
};
}.call(this));
computeIsFixed = function($element){
return 'fixed' === $css($element, 'position');
};
computeRatio = function($element, $attrs){
var stellarRatio, fixedRatioOffset;
stellarRatio = $attrs.stellarRatio || 1;
fixedRatioOffset = computeIsFixed($element) ? 1 : 0;
return stellarRatio + fixedRatioOffset - 1;
};
return {
restrict: 'A',
link: function($scope, $element, $attrs){
var isFixed, finalRatio, verticalOffset, horizontalOffset, selfProperties, selfPositions, parentProperties;
isFixed = computeIsFixed($element);
finalRatio = -1 * computeRatio($element, $attrs);
verticalOffset = $attrs.stellarVerticalOffset || stellarConfig.verticalOffset;
horizontalOffset = $attrs.stellarHorizontalOffset || stellarConfig.horizontalOffset;
selfProperties = $position.offset($element);
selfPositions = $position.position($element);
parentProperties = {
top: 0,
left: 0
};
selfProperties.positionTop = selfPositions.top;
selfProperties.positionLeft = selfPositions.left;
$scope.$on('$destroy', stellarTarget('window').addCallbak(function(targetProps){
var newTop, newOffsetTop, newLeft, newOffsetLeft, targetScrollLeft, targetScrollTop, isVisibleHorizontal, isVisibleVertical, isHidden;
newTop = selfProperties.positionTop;
newOffsetTop = selfProperties.top;
if (verticalScrolling) {
newTop += finalRatio * (targetProps.scrollTop + verticalOffset + targetProps.top + selfProperties.positionTop - selfProperties.top + parentProperties.top);
newOffsetTop += newTop - selfProperties.positionTop;
}
newLeft = selfProperties.positionLeft;
newOffsetLeft = selfProperties.left;
if (horizontalScrolling) {
newLeft += finalRatio * (targetProps.scrollLeft + horizontalOffset + targetProps.left + selfProperties.positionLeft - selfProperties.left + parentProperties.left);
newOffsetLeft += newLeft - selfProperties.positionLeft;
}
if (stellarConfig.hideDistantElements) {
targetScrollLeft = isFixed
? 0
: targetProps.scrollLeft;
targetScrollTop = isFixed
? 0
: targetProps.scrollTop;
isVisibleHorizontal = !horizontalScrolling || (newOffsetLeft + selfProperties.width > targetScrollLeft && newOffsetLeft < targetProps.width + targetProps.left + targetScrollLeft);
isVisibleVertical = !verticalScrolling || (newOffsetTop + selfProperties.height > targetScrollTop && newOffsetTop < targetProps.height + targetProps.top + targetScrollTop);
}
isHidden = stellarConfig.isElementHidden($element);
if (isVisibleHorizontal && isVisibleVertical) {
if (isHidden) {
stellarConfig.showElement($element);
}
setPosition($element, newLeft, selfProperties.positionLeft, newTop, selfProperties.positionTop);
} else if (!isHidden) {
stellarConfig.hideElement($element);
}
}));
}
};
});
angular.module('angular.stellar', ['ui.bootstrap.position']).constant('stellarConfig', stellarConfig).factory('$requestAnimationFrame', $requestAnimationFrame).factory('$css', $css).factory('$vendorPrefix', $vendorPrefix).factory('stellarTarget', stellarTarget).directive('stellarRatio', stellarRatio).directive('stellarBackgroundRatio', stellarBackgroundRatio);
}).call(this);