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-/*!
- * Angular Material Design
- * https://github.com/angular/material
- * @license MIT
- * v0.9.8
- */
-(function( window, angular, undefined ){
-"use strict";
-
-/*
- * @ngdoc module
- * @name material.components.sticky
- * @description
- *
- * Sticky effects for md
- */
-
-angular.module('material.components.sticky', [
- 'material.core',
- 'material.components.content'
-])
- .factory('$mdSticky', MdSticky);
-
-/*
- * @ngdoc service
- * @name $mdSticky
- * @module material.components.sticky
- *
- * @description
- * The `$mdSticky`service provides a mixin to make elements sticky.
- *
- * @returns A `$mdSticky` function that takes three arguments:
- * - `scope`
- * - `element`: The element that will be 'sticky'
- * - `elementClone`: A clone of the element, that will be shown
- * when the user starts scrolling past the original element.
- * If not provided, it will use the result of `element.clone()`.
- */
-
-function MdSticky($document, $mdConstant, $compile, $$rAF, $mdUtil) {
-
- var browserStickySupport = checkStickySupport();
-
- /**
- * Registers an element as sticky, used internally by directives to register themselves
- */
- return function registerStickyElement(scope, element, stickyClone) {
- var contentCtrl = element.controller('mdContent');
- if (!contentCtrl) return;
-
- if (browserStickySupport) {
- element.css({
- position: browserStickySupport,
- top: 0,
- 'z-index': 2
- });
- } else {
- var $$sticky = contentCtrl.$element.data('$$sticky');
- if (!$$sticky) {
- $$sticky = setupSticky(contentCtrl);
- contentCtrl.$element.data('$$sticky', $$sticky);
- }
-
- var deregister = $$sticky.add(element, stickyClone || element.clone());
- scope.$on('$destroy', deregister);
- }
- };
-
- function setupSticky(contentCtrl) {
- var contentEl = contentCtrl.$element;
-
- // Refresh elements is very expensive, so we use the debounced
- // version when possible.
- var debouncedRefreshElements = $$rAF.throttle(refreshElements);
-
- // setupAugmentedScrollEvents gives us `$scrollstart` and `$scroll`,
- // more reliable than `scroll` on android.
- setupAugmentedScrollEvents(contentEl);
- contentEl.on('$scrollstart', debouncedRefreshElements);
- contentEl.on('$scroll', onScroll);
-
- var self;
- var stickyBaseoffset = contentEl.prop('offsetTop');
- return self = {
- prev: null,
- current: null, //the currently stickied item
- next: null,
- items: [],
- add: add,
- refreshElements: refreshElements
- };
-
- /***************
- * Public
- ***************/
- // Add an element and its sticky clone to this content's sticky collection
- function add(element, stickyClone) {
- stickyClone.addClass('md-sticky-clone');
- stickyClone.css('top', stickyBaseoffset + 'px');
-
- var item = {
- element: element,
- clone: stickyClone
- };
- self.items.push(item);
-
- contentEl.parent().prepend(item.clone);
-
- debouncedRefreshElements();
-
- return function remove() {
- self.items.forEach(function(item, index) {
- if (item.element[0] === element[0]) {
- self.items.splice(index, 1);
- item.clone.remove();
- }
- });
- debouncedRefreshElements();
- };
- }
-
- function refreshElements() {
- // Sort our collection of elements by their current position in the DOM.
- // We need to do this because our elements' order of being added may not
- // be the same as their order of display.
- self.items.forEach(refreshPosition);
- self.items = self.items.sort(function(a, b) {
- return a.top < b.top ? -1 : 1;
- });
-
- // Find which item in the list should be active,
- // based upon the content's current scroll position
- var item;
- var currentScrollTop = contentEl.prop('scrollTop');
- for (var i = self.items.length - 1; i >= 0; i--) {
- if (currentScrollTop > self.items[i].top) {
- item = self.items[i];
- break;
- }
- }
- setCurrentItem(item);
- }
-
-
- /***************
- * Private
- ***************/
-
- // Find the `top` of an item relative to the content element,
- // and also the height.
- function refreshPosition(item) {
- // Find the top of an item by adding to the offsetHeight until we reach the
- // content element.
- var current = item.element[0];
- item.top = 0;
- item.left = 0;
- while (current && current !== contentEl[0]) {
- item.top += current.offsetTop;
- item.left += current.offsetLeft;
- current = current.offsetParent;
- }
- item.height = item.element.prop('offsetHeight');
- item.clone.css('margin-left', item.left + 'px');
- if ($mdUtil.floatingScrollbars()) {
- item.clone.css('margin-right', '0');
- }
- }
-
-
- // As we scroll, push in and select the correct sticky element.
- function onScroll() {
- var scrollTop = contentEl.prop('scrollTop');
- var isScrollingDown = scrollTop > (onScroll.prevScrollTop || 0);
- onScroll.prevScrollTop = scrollTop;
-
- // At the top?
- if (scrollTop === 0) {
- setCurrentItem(null);
-
- // Going to next item?
- } else if (isScrollingDown && self.next) {
- if (self.next.top - scrollTop <= 0) {
- // Sticky the next item if we've scrolled past its position.
- setCurrentItem(self.next);
- } else if (self.current) {
- // Push the current item up when we're almost at the next item.
- if (self.next.top - scrollTop <= self.next.height) {
- translate(self.current, self.next.top - self.next.height - scrollTop);
- } else {
- translate(self.current, null);
- }
- }
-
- // Scrolling up with a current sticky item?
- } else if (!isScrollingDown && self.current) {
- if (scrollTop < self.current.top) {
- // Sticky the previous item if we've scrolled up past
- // the original position of the currently stickied item.
- setCurrentItem(self.prev);
- }
- // Scrolling up, and just bumping into the item above (just set to current)?
- // If we have a next item bumping into the current item, translate
- // the current item up from the top as it scrolls into view.
- if (self.current && self.next) {
- if (scrollTop >= self.next.top - self.current.height) {
- translate(self.current, self.next.top - scrollTop - self.current.height);
- } else {
- translate(self.current, null);
- }
- }
- }
- }
-
- function setCurrentItem(item) {
- if (self.current === item) return;
- // Deactivate currently active item
- if (self.current) {
- translate(self.current, null);
- setStickyState(self.current, null);
- }
-
- // Activate new item if given
- if (item) {
- setStickyState(item, 'active');
- }
-
- self.current = item;
- var index = self.items.indexOf(item);
- // If index === -1, index + 1 = 0. It works out.
- self.next = self.items[index + 1];
- self.prev = self.items[index - 1];
- setStickyState(self.next, 'next');
- setStickyState(self.prev, 'prev');
- }
-
- function setStickyState(item, state) {
- if (!item || item.state === state) return;
- if (item.state) {
- item.clone.attr('sticky-prev-state', item.state);
- item.element.attr('sticky-prev-state', item.state);
- }
- item.clone.attr('sticky-state', state);
- item.element.attr('sticky-state', state);
- item.state = state;
- }
-
- function translate(item, amount) {
- if (!item) return;
- if (amount === null || amount === undefined) {
- if (item.translateY) {
- item.translateY = null;
- item.clone.css($mdConstant.CSS.TRANSFORM, '');
- }
- } else {
- item.translateY = amount;
- item.clone.css(
- $mdConstant.CSS.TRANSFORM,
- 'translate3d(' + item.left + 'px,' + amount + 'px,0)'
- );
- }
- }
- }
-
- // Function to check for browser sticky support
- function checkStickySupport($el) {
- var stickyProp;
- var testEl = angular.element('<div>');
- $document[0].body.appendChild(testEl[0]);
-
- var stickyProps = ['sticky', '-webkit-sticky'];
- for (var i = 0; i < stickyProps.length; ++i) {
- testEl.css({position: stickyProps[i], top: 0, 'z-index': 2});
- if (testEl.css('position') == stickyProps[i]) {
- stickyProp = stickyProps[i];
- break;
- }
- }
- testEl.remove();
- return stickyProp;
- }
-
- // Android 4.4 don't accurately give scroll events.
- // To fix this problem, we setup a fake scroll event. We say:
- // > If a scroll or touchmove event has happened in the last DELAY milliseconds,
- // then send a `$scroll` event every animationFrame.
- // Additionally, we add $scrollstart and $scrollend events.
- function setupAugmentedScrollEvents(element) {
- var SCROLL_END_DELAY = 200;
- var isScrolling;
- var lastScrollTime;
- element.on('scroll touchmove', function() {
- if (!isScrolling) {
- isScrolling = true;
- $$rAF(loopScrollEvent);
- element.triggerHandler('$scrollstart');
- }
- element.triggerHandler('$scroll');
- lastScrollTime = +$mdUtil.now();
- });
-
- function loopScrollEvent() {
- if (+$mdUtil.now() - lastScrollTime > SCROLL_END_DELAY) {
- isScrolling = false;
- element.triggerHandler('$scrollend');
- } else {
- element.triggerHandler('$scroll');
- $$rAF(loopScrollEvent);
- }
- }
- }
-
-}
-MdSticky.$inject = ["$document", "$mdConstant", "$compile", "$$rAF", "$mdUtil"];
-
-})(window, window.angular); \ No newline at end of file