ZipCoin-RED/ZipCoinRedIonicClient/node_modules/ionic-angular/umd/components/virtual-scroll/virtual-scroll.js

(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define(["require", "exports", "@angular/core", "./virtual-util", "../../config/config", "../content/content", "../../platform/dom-controller", "../../util/util", "../../platform/platform", "../../navigation/view-controller", "./virtual-item", "./virtual-footer", "./virtual-header"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    var core_1 = require("@angular/core");
    var virtual_util_1 = require("./virtual-util");
    var config_1 = require("../../config/config");
    var content_1 = require("../content/content");
    var dom_controller_1 = require("../../platform/dom-controller");
    var util_1 = require("../../util/util");
    var platform_1 = require("../../platform/platform");
    var view_controller_1 = require("../../navigation/view-controller");
    var virtual_item_1 = require("./virtual-item");
    var virtual_footer_1 = require("./virtual-footer");
    var virtual_header_1 = require("./virtual-header");
    /**
     * @name VirtualScroll
     * @description
     * Virtual Scroll displays a virtual, "infinite" list. An array of records
     * is passed to the virtual scroll containing the data to create templates
     * for. The template created for each record, referred to as a cell, can
     * consist of items, headers, and footers.
     *
     * For performance reasons, not every record in the list is rendered at once;
     * instead a small subset of records (enough to fill the viewport) are rendered
     * and reused as the user scrolls.
     *
     * ### The Basics
     *
     * The array of records should be passed to the `virtualScroll` property.
     * The data given to the `virtualScroll` property must be an array. An item
     * template with the `*virtualItem` property is required in the `virtualScroll`.
     * The `virtualScroll` and `*virtualItem` properties can be added to any element.
     *
     * ```html
     * <ion-list [virtualScroll]="items">
     *
     *   <ion-item *virtualItem="let item">
     *     {% raw %}{{ item }}{% endraw %}
     *   </ion-item>
     *
     * </ion-list>
     * ```
     *
     *
     * ### Section Headers and Footers
     *
     * Section headers and footers are optional. They can be dynamically created
     * from developer-defined functions. For example, a large list of contacts
     * usually has a divider for each letter in the alphabet. Developers provide
     * their own custom function to be called on each record. The logic in the
     * custom function should determine whether to create the section template
     * and what data to provide to the template. The custom function should
     * return `null` if a template shouldn't be created.
     *
     * ```html
     * <ion-list [virtualScroll]="items" [headerFn]="myHeaderFn">
     *
     *   <ion-item-divider *virtualHeader="let header">
     *     Header: {% raw %}{{ header }}{% endraw %}
     *   </ion-item-divider>
     *
     *   <ion-item *virtualItem="let item">
     *     Item: {% raw %}{{ item }}{% endraw %}
     *   </ion-item>
     *
     * </ion-list>
     * ```
     *
     * Below is an example of a custom function called on every record. It
     * gets passed the individual record, the record's index number,
     * and the entire array of records. In this example, after every 20
     * records a header will be inserted. So between the 19th and 20th records,
     * between the 39th and 40th, and so on, a `<ion-item-divider>` will
     * be created and the template's data will come from the function's
     * returned data.
     *
     * ```ts
     * myHeaderFn(record, recordIndex, records) {
     *   if (recordIndex % 20 === 0) {
     *     return 'Header ' + recordIndex;
     *   }
     *   return null;
     * }
     * ```
     *
     *
     * ### Approximate Widths and Heights
     *
     * If the height of items in the virtual scroll are not close to the
     * default size of 40px, it is extremely important to provide a value for
     * approxItemHeight height. An exact pixel-perfect size is not necessary,
     * but without an estimate the virtual scroll will not render correctly.
     *
     * The approximate width and height of each template is used to help
     * determine how many cells should be created, and to help calculate
     * the height of the scrollable area. Note that the actual rendered size
     * of each cell comes from the app's CSS, whereas this approximation
     * is only used to help calculate initial dimensions.
     *
     * It's also important to know that Ionic's default item sizes have
     * slightly different heights between platforms, which is perfectly fine.
     *
     *
     * ### Images Within Virtual Scroll
     *
     * HTTP requests, image decoding, and image rendering can cause jank while
     * scrolling. In order to better control images, Ionic provides `<ion-img>`
     * to manage HTTP requests and image rendering. While scrolling through items
     * quickly, `<ion-img>` knows when and when not to make requests, when and
     * when not to render images, and only loads the images that are viewable
     * after scrolling. [Read more about `ion-img`.](../../img/Img/)
     *
     * It's also important for app developers to ensure image sizes are locked in,
     * and after images have fully loaded they do not change size and affect any
     * other element sizes. Simply put, to ensure rendering bugs are not introduced,
     * it's vital that elements within a virtual item does not dynamically change.
     *
     * For virtual scrolling, the natural effects of the `<img>` are not desirable
     * features. We recommend using the `<ion-img>` component over the native
     * `<img>` element because when an `<img>` element is added to the DOM, it
     * immediately makes a HTTP request for the image file. Additionally, `<img>`
     * renders whenever it wants which could be while the user is scrolling. However,
     * `<ion-img>` is governed by the containing `ion-content` and does not render
     * images while scrolling quickly.
     *
     * ```html
     * <ion-list [virtualScroll]="items">
     *
     *   <ion-item *virtualItem="let item">
     *     <ion-avatar item-start>
     *       <ion-img [src]="item.avatarUrl"></ion-img>
     *     </ion-avatar>
     *    {% raw %} {{ item.firstName }} {{ item.lastName }}{% endraw %}
     *   </ion-item>
     *
     * </ion-list>
     * ```
     *
     *
     * ### Custom Components
     *
     * If a custom component is going to be used within Virtual Scroll, it's best
     * to wrap it with a good old `<div>` to ensure the component is rendered
     * correctly. Since each custom component's implementation and internals can be
     * quite different, wrapping within a `<div>` is a safe way to make sure
     * dimensions are measured correctly.
     *
     * ```html
     * <ion-list [virtualScroll]="items">
     *
     *   <div *virtualItem="let item">
     *     <my-custom-item [item]="item">
     *       {% raw %} {{ item }}{% endraw %}
     *     </my-custom-item>
     *   </div>
     *
     * </ion-list>
     * ```
     *
     *
     * ## Virtual Scroll Performance Tips
     *
     * #### iOS Cordova WKWebView
     *
     * When deploying to iOS with Cordova, it's highly recommended to use the
     * [WKWebView plugin](http://blog.ionic.io/cordova-ios-performance-improvements-drop-in-speed-with-wkwebview/)
     * in order to take advantage of iOS's higher performimg webview. Additionally,
     * WKWebView is superior at scrolling efficiently in comparision to the older
     * UIWebView.
     *
     * #### Lock in element dimensions and locations
     *
     * In order for virtual scroll to efficiently size and locate every item, it's
     * very important every element within each virtual item does not dynamically
     * change its dimensions or location. The best way to ensure size and location
     * does not change, it's recommended each virtual item has locked in its size
     * via CSS.
     *
     * #### Use `ion-img` for images
     *
     * When including images within Virtual Scroll, be sure to use
     * [`ion-img`](../img/Img/) rather than the standard `<img>` HTML element.
     * With `ion-img`, images are lazy loaded so only the viewable ones are
     * rendered, and HTTP requests are efficiently controlled while scrolling.
     *
     * #### Set Approximate Widths and Heights
     *
     * As mentioned above, all elements should lock in their dimensions. However,
     * virtual scroll isn't aware of the dimensions until after they have been
     * rendered. For the initial render, virtual scroll still needs to set
     * how many items should be built. With "approx" property inputs, such as
     * `approxItemHeight`, we're able to give virtual scroll an approximate size,
     * therefore allowing virtual scroll to decide how many items should be
     * created.
     *
     * #### Changing dataset should use `virtualTrackBy`
     *
     * It is possible for the identities of elements in the iterator to change
     * while the data does not. This can happen, for example, if the iterator
     * produced from an RPC to the server, and that RPC is re-run. Even if the
     * "data" hasn't changed, the second response will produce objects with
     * different identities, and Ionic will tear down the entire DOM and rebuild
     * it. This is an expensive operation and should be avoided if possible.
     *
     * #### Efficient headers and footer functions
     *
     * Each virtual item must stay extremely efficient, but one way to really
     * kill its performance is to perform any DOM operations within section header
     * and footer functions. These functions are called for every record in the
     * dataset, so please make sure they're performant.
     *
     */
    var VirtualScroll = (function () {
        function VirtualScroll(_iterableDiffers, _elementRef, _renderer, _zone, _cd, _content, _plt, _ctrl, _config, _dom) {
            var _this = this;
            this._iterableDiffers = _iterableDiffers;
            this._elementRef = _elementRef;
            this._renderer = _renderer;
            this._zone = _zone;
            this._cd = _cd;
            this._content = _content;
            this._plt = _plt;
            this._ctrl = _ctrl;
            this._config = _config;
            this._dom = _dom;
            this._init = false;
            this._lastEle = false;
            this._records = [];
            this._cells = [];
            this._nodes = [];
            this._vHeight = 0;
            this._lastCheck = 0;
            this._recordSize = 0;
            this._data = {
                scrollTop: 0,
            };
            this._queue = 1 /* NoChanges */;
            /**
             * @input {number} The buffer ratio is used to decide how many cells
             * should get created when initially rendered. The number is a
             * multiplier against the viewable area's height. For example, if it
             * takes `20` cells to fill up the height of the viewable area, then
             * with a buffer ratio of `3` it will create `60` cells that are
             * available for reuse while scrolling. For better performance, it's
             * better to have more cells than what are required to fill the
             * viewable area. Default is `3`.
             */
            this.bufferRatio = 3;
            /**
             * @input {string} The approximate width of each item template's cell.
             * This dimension is used to help determine how many cells should
             * be created when initialized, and to help calculate the height of
             * the scrollable area. This value can use either `px` or `%` units.
             * Note that the actual rendered size of each cell comes from the
             * app's CSS, whereas this approximation is used to help calculate
             * initial dimensions before the item has been rendered. Default is
             * `100%`.
             */
            this.approxItemWidth = '100%';
            /**
             * @input {string} The approximate width of each header template's cell.
             * This dimension is used to help determine how many cells should
             * be created when initialized, and to help calculate the height of
             * the scrollable area. This value can use either `px` or `%` units.
             * Note that the actual rendered size of each cell comes from the
             * app's CSS, whereas this approximation is used to help calculate
             * initial dimensions. Default is `100%`.
             */
            this.approxHeaderWidth = '100%';
            /**
             * @input {string} The approximate height of each header template's cell.
             * This dimension is used to help determine how many cells should
             * be created when initialized, and to help calculate the height of
             * the scrollable area. This height value can only use `px` units.
             * Note that the actual rendered size of each cell comes from the
             * app's CSS, whereas this approximation is used to help calculate
             * initial dimensions before the item has been rendered. Default is `40px`.
             */
            this.approxHeaderHeight = '40px';
            /**
             * @input {string} The approximate width of each footer template's cell.
             * This dimension is used to help determine how many cells should
             * be created when initialized, and to help calculate the height of
             * the scrollable area. This value can use either `px` or `%` units.
             * Note that the actual rendered size of each cell comes from the
             * app's CSS, whereas this approximation is used to help calculate
             * initial dimensions before the item has been rendered. Default is `100%`.
             */
            this.approxFooterWidth = '100%';
            /**
             * @input {string} The approximate height of each footer template's cell.
             * This dimension is used to help determine how many cells should
             * be created when initialized, and to help calculate the height of
             * the scrollable area. This height value can only use `px` units.
             * Note that the actual rendered size of each cell comes from the
             * app's CSS, whereas this approximation is used to help calculate
             * initial dimensions before the item has been rendered. Default is `40px`.
             */
            this.approxFooterHeight = '40px';
            // hide the virtual scroll element with opacity so we don't
            // see jank as it loads up, but we're still able to read
            // dimensions because it's still rendered and only opacity hidden
            this.setElementClass('virtual-loading', true);
            // wait for the content to be rendered and has readable dimensions
            var readSub = _ctrl.readReady.subscribe(function () {
                readSub.unsubscribe();
                _this.readUpdate(true);
            });
            // wait for the content to be writable
            var writeSub = _ctrl.writeReady.subscribe(function () {
                writeSub.unsubscribe();
                _this._init = true;
                _this.writeUpdate(true);
                _this._listeners();
            });
        }
        Object.defineProperty(VirtualScroll.prototype, "virtualScroll", {
            get: function () {
                return this._records;
            },
            /**
             * @input {array} The data that builds the templates within the virtual scroll.
             * This is the same data that you'd pass to `*ngFor`. It's important to note
             * that when this data has changed, then the entire virtual scroll is reset,
             * which is an expensive operation and should be avoided if possible.
             */
            set: function (val) {
                this._records = val;
            },
            enumerable: true,
            configurable: true
        });
        Object.defineProperty(VirtualScroll.prototype, "headerFn", {
            /**
             * @input {function} Section headers and the data used within its given
             * template can be dynamically created by passing a function to `headerFn`.
             * For example, a large list of contacts usually has dividers between each
             * letter in the alphabet. App's can provide their own custom `headerFn`
             * which is called with each record within the dataset. The logic within
             * the header function can decide if the header template should be used,
             * and what data to give to the header template. The function must return
             * `null` if a header cell shouldn't be created.
             */
            set: function (val) {
                if (util_1.isFunction(val)) {
                    this._hdrFn = val.bind((this._ctrl._cmp) || this);
                }
            },
            enumerable: true,
            configurable: true
        });
        Object.defineProperty(VirtualScroll.prototype, "footerFn", {
            /**
             * @input {function} Section footers and the data used within its given
             * template can be dynamically created by passing a function to `footerFn`.
             * The logic within the footer function can decide if the footer template
             * should be used, and what data to give to the footer template. The function
             * must return `null` if a footer cell shouldn't be created.
             */
            set: function (val) {
                if (util_1.isFunction(val)) {
                    this._ftrFn = val.bind((this._ctrl._cmp) || this);
                }
            },
            enumerable: true,
            configurable: true
        });
        /**
         * @hidden
         */
        VirtualScroll.prototype.firstRecord = function () {
            var cells = this._cells;
            return (cells.length > 0) ? cells[0].record : 0;
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype.lastRecord = function () {
            var cells = this._cells;
            return (cells.length > 0) ? cells[cells.length - 1].record : 0;
        };
        /**
        * @hidden
        */
        VirtualScroll.prototype.ngOnChanges = function (changes) {
            if ('virtualScroll' in changes) {
                // React on virtualScroll changes only once all inputs have been initialized
                var value = changes['virtualScroll'].currentValue;
                if (!util_1.isPresent(this._differ) && util_1.isPresent(value)) {
                    try {
                        this._differ = this._iterableDiffers.find(value).create(this.virtualTrackBy);
                    }
                    catch (e) {
                        throw new Error("Cannot find a differ supporting object '" + value + "'. VirtualScroll only supports binding to Iterables such as Arrays.");
                    }
                }
            }
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype.ngDoCheck = function () {
            // only continue if we've already initialized
            if (!this._init) {
                return;
            }
            // and if there actually are changes
            var changes = util_1.isPresent(this._differ) ? this._differ.diff(this.virtualScroll) : null;
            if (!util_1.isPresent(changes)) {
                return;
            }
            var needClean = false;
            var lastRecord = this._recordSize;
            changes.forEachOperation(function (_, pindex, cindex) {
                // add new record after current position
                if (pindex === null && (cindex < lastRecord)) {
                    (void 0) /* console.debug */;
                    needClean = true;
                    return;
                }
                // remove record after current position
                if (pindex < lastRecord && cindex === null) {
                    (void 0) /* console.debug */;
                    needClean = true;
                    return;
                }
            });
            this._recordSize = this._records ? this._records.length : 0;
            this.readUpdate(needClean);
            this.writeUpdate(needClean);
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype.readUpdate = function (needClean) {
            if (needClean) {
                // reset everything
                (void 0) /* console.debug */;
                this._cells.length = 0;
                // this._nodes.length = 0;
                // this._itmTmp.viewContainer.clear();
                // ******** DOM READ ****************
                this.calcDimensions();
            }
            else {
                (void 0) /* console.debug */;
            }
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype.writeUpdate = function (needClean) {
            (void 0) /* console.debug */;
            var data = this._data;
            var stopAtHeight = (data.scrollTop + data.renderHeight);
            data.scrollDiff = SCROLL_DIFFERENCE_MINIMUM + 1;
            virtual_util_1.processRecords(stopAtHeight, this._records, this._cells, this._hdrFn, this._ftrFn, this._data);
            // ******** DOM WRITE ****************
            this.renderVirtual(needClean);
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype.calcDimensions = function () {
            virtual_util_1.calcDimensions(this._data, this._elementRef.nativeElement, this.approxItemWidth, this.approxItemHeight, this.approxHeaderWidth, this.approxHeaderHeight, this.approxFooterWidth, this.approxFooterHeight, this.bufferRatio);
        };
        /**
         * @hidden
         * DOM WRITE
         */
        VirtualScroll.prototype.renderVirtual = function (needClean) {
            var _this = this;
            this._plt.raf(function () {
                var nodes = _this._nodes;
                var cells = _this._cells;
                var data = _this._data;
                var records = _this._records;
                if (needClean) {
                    // ******** DOM WRITE ****************
                    virtual_util_1.updateDimensions(_this._plt, nodes, cells, data, true);
                    data.topCell = 0;
                    data.bottomCell = (cells.length - 1);
                }
                virtual_util_1.adjustRendered(cells, data);
                _this._zone.run(function () {
                    virtual_util_1.populateNodeData(data.topCell, data.bottomCell, true, cells, records, nodes, _this._itmTmp.viewContainer, _this._itmTmp.templateRef, _this._hdrTmp && _this._hdrTmp.templateRef, _this._ftrTmp && _this._ftrTmp.templateRef);
                });
                if (needClean) {
                    _this._cd.detectChanges();
                }
                // at this point, this fn was called from within another
                // requestAnimationFrame, so the next dom reads/writes within the next frame
                // wait a frame before trying to read and calculate the dimensions
                // ******** DOM READ ****************
                _this._dom.read(function () { return virtual_util_1.initReadNodes(_this._plt, nodes, cells, data); });
                _this._dom.write(function () {
                    // update the bound context for each node
                    virtual_util_1.updateNodeContext(nodes, cells, data);
                    // ******** DOM WRITE ****************
                    _this._stepChangeDetection();
                    // ******** DOM WRITE ****************
                    _this._stepDOMWrite();
                    // ******** DOM WRITE ****************
                    _this._content.imgsUpdate();
                    // First time load
                    if (!_this._lastEle) {
                        // add an element at the end so :last-child css doesn't get messed up
                        // ******** DOM WRITE ****************
                        var ele = _this._elementRef.nativeElement;
                        var lastEle = _this._renderer.createElement(ele, 'div');
                        lastEle.className = 'virtual-last';
                        _this._lastEle = true;
                        // ******** DOM WRITE ****************
                        _this.setElementClass('virtual-scroll', true);
                        // ******** DOM WRITE ****************
                        _this.setElementClass('virtual-loading', false);
                    }
                    (void 0) /* assert */;
                });
            });
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype.resize = function () {
            // only continue if we've already initialized
            if (!this._init) {
                return;
            }
            // check if component is rendered in the dom currently
            if (this._elementRef.nativeElement.offsetParent === null) {
                return;
            }
            (void 0) /* console.debug */;
            this.calcDimensions();
            this.writeUpdate(false);
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype._stepDOMWrite = function () {
            var cells = this._cells;
            var nodes = this._nodes;
            // ******** DOM WRITE ****************
            virtual_util_1.writeToNodes(this._plt, nodes, cells, this._recordSize);
            // ******** DOM WRITE ****************
            this._setHeight(virtual_util_1.estimateHeight(this._recordSize, cells[cells.length - 1], this._vHeight, 0.25));
            // we're done here, good work
            this._queue = 1 /* NoChanges */;
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype._stepChangeDetection = function () {
            // we need to do some change detection in this frame
            // we've got work painting do, let's throw it in the
            // domWrite callback so everyone plays nice
            // ******** DOM WRITE ****************
            var nodes = this._nodes;
            for (var i = 0; i < nodes.length; i++) {
                if (nodes[i].hasChanges) {
                    nodes[i].view.detectChanges();
                }
            }
            // on the next frame we need write to the dom nodes manually
            this._queue = 3 /* DomWrite */;
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype._stepNoChanges = function () {
            var data = this._data;
            // let's see if we've scroll far enough to require another check
            var diff = data.scrollDiff = (data.scrollTop - this._lastCheck);
            if (Math.abs(diff) < SCROLL_DIFFERENCE_MINIMUM) {
                return;
            }
            var cells = this._cells;
            var nodes = this._nodes;
            var records = this._records;
            // don't bother updating if the scrollTop hasn't changed much
            this._lastCheck = data.scrollTop;
            if (diff > 0) {
                // load data we may not have processed yet
                var stopAtHeight = (data.scrollTop + data.renderHeight);
                virtual_util_1.processRecords(stopAtHeight, records, cells, this._hdrFn, this._ftrFn, data);
            }
            // ******** DOM READ ****************
            virtual_util_1.updateDimensions(this._plt, nodes, cells, data, false);
            virtual_util_1.adjustRendered(cells, data);
            var hasChanges = virtual_util_1.populateNodeData(data.topCell, data.bottomCell, diff > 0, cells, records, nodes, this._itmTmp.viewContainer, this._itmTmp.templateRef, this._hdrTmp && this._hdrTmp.templateRef, this._ftrTmp && this._ftrTmp.templateRef);
            if (hasChanges) {
                // queue making updates in the next frame
                this._queue = 2 /* ChangeDetection */;
                // update the bound context for each node
                virtual_util_1.updateNodeContext(nodes, cells, data);
            }
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype.scrollUpdate = function (ev) {
            var _this = this;
            // set the scroll top from the scroll event
            this._data.scrollTop = ev.scrollTop;
            // there is a queue system so that we can
            // spread out the work over multiple frames
            var queue = this._queue;
            if (queue === 1 /* NoChanges */) {
                // no dom writes or change detection to take care of
                this._stepNoChanges();
            }
            else if (queue === 2 /* ChangeDetection */) {
                this._dom.write(function () { return _this._stepChangeDetection(); });
            }
            else {
                (void 0) /* assert */;
                // there are DOM writes we need to take care of in this frame
                this._dom.write(function () { return _this._stepDOMWrite(); });
            }
        };
        /**
         * @hidden
         * DOM WRITE
         */
        VirtualScroll.prototype.scrollEnd = function () {
            var _this = this;
            // ******** DOM READ ****************
            virtual_util_1.updateDimensions(this._plt, this._nodes, this._cells, this._data, false);
            virtual_util_1.adjustRendered(this._cells, this._data);
            virtual_util_1.populateNodeData(this._data.topCell, this._data.bottomCell, true, this._cells, this._records, this._nodes, this._itmTmp.viewContainer, this._itmTmp.templateRef, this._hdrTmp && this._hdrTmp.templateRef, this._ftrTmp && this._ftrTmp.templateRef);
            // ******** DOM WRITE ***************
            this._dom.write(function () {
                // update the bound context for each node
                virtual_util_1.updateNodeContext(_this._nodes, _this._cells, _this._data);
                // ******** DOM WRITE ***************
                _this._stepChangeDetection();
                // ******** DOM WRITE ****************
                _this._stepDOMWrite();
            });
        };
        /**
         * @hidden
         * NO DOM
         */
        VirtualScroll.prototype._listeners = function () {
            (void 0) /* assert */;
            if (!this._scrollSub) {
                if (this._config.getBoolean('virtualScrollEventAssist')) {
                    // use JS scrolling for iOS UIWebView
                    // goal is to completely remove this when iOS
                    // fully supports scroll events
                    // listen to JS scroll events
                    this._content.enableJsScroll();
                }
                this._resizeSub = this._plt.resize.subscribe(this.resize.bind(this));
                this._scrollSub = this._content.ionScroll.subscribe(this.scrollUpdate.bind(this));
                this._scrollEndSub = this._content.ionScrollEnd.subscribe(this.scrollEnd.bind(this));
            }
        };
        /**
         * @hidden
         * DOM WRITE
         */
        VirtualScroll.prototype._setHeight = function (newVirtualHeight) {
            if (newVirtualHeight !== this._vHeight) {
                // ******** DOM WRITE ****************
                this._renderer.setElementStyle(this._elementRef.nativeElement, 'height', newVirtualHeight > 0 ? newVirtualHeight + 'px' : '');
                this._vHeight = newVirtualHeight;
                (void 0) /* console.debug */;
            }
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype.ngAfterContentInit = function () {
            (void 0) /* assert */;
            if (!this.approxItemHeight) {
                this.approxItemHeight = '40px';
                console.warn('Virtual Scroll: Please provide an "approxItemHeight" input to ensure proper virtual scroll rendering');
            }
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype.setElementClass = function (className, add) {
            this._renderer.setElementClass(this._elementRef.nativeElement, className, add);
        };
        /**
         * @hidden
         */
        VirtualScroll.prototype.ngOnDestroy = function () {
            this._resizeSub && this._resizeSub.unsubscribe();
            this._scrollSub && this._scrollSub.unsubscribe();
            this._scrollEndSub && this._scrollEndSub.unsubscribe();
            this._resizeSub = this._scrollEndSub = this._scrollSub = null;
            this._hdrFn = this._ftrFn = this._records = this._cells = this._nodes = this._data = null;
        };
        VirtualScroll.decorators = [
            { type: core_1.Directive, args: [{
                        selector: '[virtualScroll]'
                    },] },
        ];
        /** @nocollapse */
        VirtualScroll.ctorParameters = function () { return [
            { type: core_1.IterableDiffers, },
            { type: core_1.ElementRef, },
            { type: core_1.Renderer, },
            { type: core_1.NgZone, },
            { type: core_1.ChangeDetectorRef, },
            { type: content_1.Content, },
            { type: platform_1.Platform, },
            { type: view_controller_1.ViewController, },
            { type: config_1.Config, },
            { type: dom_controller_1.DomController, },
        ]; };
        VirtualScroll.propDecorators = {
            '_itmTmp': [{ type: core_1.ContentChild, args: [virtual_item_1.VirtualItem,] },],
            '_hdrTmp': [{ type: core_1.ContentChild, args: [virtual_header_1.VirtualHeader,] },],
            '_ftrTmp': [{ type: core_1.ContentChild, args: [virtual_footer_1.VirtualFooter,] },],
            'virtualScroll': [{ type: core_1.Input },],
            'bufferRatio': [{ type: core_1.Input },],
            'approxItemWidth': [{ type: core_1.Input },],
            'approxItemHeight': [{ type: core_1.Input },],
            'approxHeaderWidth': [{ type: core_1.Input },],
            'approxHeaderHeight': [{ type: core_1.Input },],
            'approxFooterWidth': [{ type: core_1.Input },],
            'approxFooterHeight': [{ type: core_1.Input },],
            'headerFn': [{ type: core_1.Input },],
            'footerFn': [{ type: core_1.Input },],
            'virtualTrackBy': [{ type: core_1.Input },],
        };
        return VirtualScroll;
    }());
    exports.VirtualScroll = VirtualScroll;
    var SCROLL_DIFFERENCE_MINIMUM = 40;
});
//# sourceMappingURL=virtual-scroll.js.map