angular2-infinite-scroll/src/position-resolver.js

"use strict";
var core_1 = require('@angular/core');
var axis_resolver_1 = require('./axis-resolver');
var PositionResolverFactory = (function () {
    function PositionResolverFactory(axisResolver) {
        this.axisResolver = axisResolver;
    }
    PositionResolverFactory.prototype.create = function (options) {
        return new PositionResolver(this.axisResolver.create(!options.horizontal), options);
    };
    PositionResolverFactory.decorators = [
        { type: core_1.Injectable },
    ];
    /** @nocollapse */
    PositionResolverFactory.ctorParameters = function () { return [
        { type: axis_resolver_1.AxisResolverFactory, },
    ]; };
    return PositionResolverFactory;
}());
exports.PositionResolverFactory = PositionResolverFactory;
var PositionResolver = (function () {
    function PositionResolver(axis, options) {
        this.axis = axis;
        this.options = options;
        this.resolveContainer(this.options.windowElement);
        this.defineContainer(this.options.windowElement);
    }
    PositionResolver.prototype.defineContainer = function (windowElement) {
        if (this.resolveContainer(windowElement) || !windowElement.nativeElement) {
            this.container = windowElement;
        }
        else {
            this.container = windowElement.nativeElement;
        }
        return this.container;
    };
    PositionResolver.prototype.resolveContainer = function (windowElement) {
        var isContainerWindow = Object.prototype.toString.call(windowElement).includes('Window');
        this.isContainerWindow = isContainerWindow;
        return isContainerWindow;
    };
    PositionResolver.prototype.getDocumentElement = function () {
        return this.isContainerWindow
            ? this.options.windowElement.document.documentElement
            : null;
    };
    PositionResolver.prototype.calculatePoints = function (element) {
        return this.isContainerWindow
            ? this.calculatePointsForWindow(element)
            : this.calculatePointsForElement(element);
    };
    PositionResolver.prototype.calculatePointsForWindow = function (element) {
        // container's height
        var height = this.height(this.container);
        // scrolled until now / current y point
        var scrolledUntilNow = height + this.pageYOffset(this.getDocumentElement());
        // total height / most bottom y point
        var totalToScroll = this.offsetTop(element.nativeElement) + this.height(element.nativeElement);
        return { height: height, scrolledUntilNow: scrolledUntilNow, totalToScroll: totalToScroll };
    };
    PositionResolver.prototype.calculatePointsForElement = function (element) {
        var scrollTop = this.axis.scrollTopKey();
        var scrollHeight = this.axis.scrollHeightKey();
        var container = this.container;
        var height = this.height(container);
        // perhaps use this.container.offsetTop instead of 'scrollTop'
        var scrolledUntilNow = container[scrollTop];
        var containerTopOffset = 0;
        var offsetTop = this.offsetTop(container);
        if (offsetTop !== void 0) {
            containerTopOffset = offsetTop;
        }
        var totalToScroll = container[scrollHeight];
        return { height: height, scrolledUntilNow: scrolledUntilNow, totalToScroll: totalToScroll };
    };
    PositionResolver.prototype.height = function (elem) {
        var offsetHeight = this.axis.offsetHeightKey();
        var clientHeight = this.axis.clientHeightKey();
        // elem = elem.nativeElement;
        if (isNaN(elem[offsetHeight])) {
            return this.getDocumentElement()[clientHeight];
        }
        else {
            return elem[offsetHeight];
        }
    };
    PositionResolver.prototype.offsetTop = function (elem) {
        var top = this.axis.topKey();
        // elem = elem.nativeElement;
        if (!elem.getBoundingClientRect) {
            return;
        }
        return elem.getBoundingClientRect()[top] + this.pageYOffset(elem);
    };
    PositionResolver.prototype.pageYOffset = function (elem) {
        var pageYOffset = this.axis.pageYOffsetKey();
        var scrollTop = this.axis.scrollTopKey();
        var offsetTop = this.axis.offsetTopKey();
        // elem = elem.nativeElement;
        if (isNaN(window[pageYOffset])) {
            return this.getDocumentElement()[scrollTop];
        }
        else if (elem.ownerDocument) {
            return elem.ownerDocument.defaultView[pageYOffset];
        }
        else {
            return elem[offsetTop];
        }
    };
    return PositionResolver;
}());
exports.PositionResolver = PositionResolver;
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{ Injectable, ElementRef } from '@angular/core';\nimport { AxisResolver, AxisResolverFactory } from './axis-resolver';\nimport { ContainerRef, PositionElements, PositionStats } from './models';\n\n\nexport class PositionResolverFactory {\n\n  constructor(private axisResolver: AxisResolverFactory) {\n  }\n\n  create (options: PositionElements) {\n    return new PositionResolver(this.axisResolver.create(!options.horizontal), options);\n  }\nstatic decorators: DecoratorInvocation[] = [\n{ type: Injectable },\n];\n/** @nocollapse */\nstatic ctorParameters: () => ({type: any, decorators?: DecoratorInvocation[]}|null)[] = () => [\n{type: AxisResolverFactory, },\n];\n}\n\nexport class PositionResolver {\n  private documentElement: ContainerRef;\n  private isContainerWindow: boolean;\n  public container: ContainerRef;\n\n  constructor (private axis: AxisResolver, private options: PositionElements) {\n    this.resolveContainer(this.options.windowElement);\n    this.defineContainer(this.options.windowElement);\n  }\n\n  defineContainer(windowElement: ContainerRef) {\n    if (this.resolveContainer(windowElement) || !windowElement.nativeElement) {\n      this.container = windowElement;\n    } else {\n      this.container = windowElement.nativeElement;\n    }\n    return this.container;\n  }\n\n  resolveContainer(windowElement: ContainerRef): boolean {\n    const isContainerWindow = Object.prototype.toString.call(windowElement).includes('Window');\n    this.isContainerWindow = isContainerWindow;\n    return isContainerWindow;\n  }\n\n  getDocumentElement() {\n    return this.isContainerWindow\n      ? this.options.windowElement.document.documentElement\n      : null;\n  }\n\n  calculatePoints (element: ElementRef) {\n    return this.isContainerWindow\n      ? this.calculatePointsForWindow(element)\n      : this.calculatePointsForElement(element);\n  }\n\n  calculatePointsForWindow (element: ElementRef): PositionStats {\n    // container's height\n    const height = this.height(this.container);\n    // scrolled until now / current y point\n    const scrolledUntilNow = height + this.pageYOffset(this.getDocumentElement());\n    // total height / most bottom y point\n    const totalToScroll = this.offsetTop(element.nativeElement) + this.height(element.nativeElement);\n    return { height, scrolledUntilNow, totalToScroll };\n  }\n\n  calculatePointsForElement (element: ElementRef) {\n    let scrollTop    = this.axis.scrollTopKey();\n    let scrollHeight = this.axis.scrollHeightKey();\n    const container = this.container;\n\n    const height = this.height(container);\n    // perhaps use this.container.offsetTop instead of 'scrollTop'\n    const scrolledUntilNow = container[scrollTop];\n    let containerTopOffset = 0;\n    const offsetTop = this.offsetTop(container);\n    if (offsetTop !== void 0) {\n      containerTopOffset = offsetTop;\n    }\n    const totalToScroll = container[scrollHeight];\n    return { height, scrolledUntilNow, totalToScroll };\n  }\n\n  private height (elem: any) {\n    let offsetHeight = this.axis.offsetHeightKey();\n    let clientHeight = this.axis.clientHeightKey();\n\n    // elem = elem.nativeElement;\n    if (isNaN(elem[offsetHeight])) {\n      return this.getDocumentElement()[clientHeight];\n    } else {\n      return elem[offsetHeight];\n    }\n  }\n\n  private offsetTop (elem: any) {\n    let top = this.axis.topKey();\n\n    // elem = elem.nativeElement;\n    if (!elem.getBoundingClientRect) { // || elem.css('none')) {\n      return;\n    }\n    return elem.getBoundingClientRect()[top] + this.pageYOffset(elem);\n  }\n\n  pageYOffset (elem: any) {\n    let pageYOffset = this.axis.pageYOffsetKey();\n    let scrollTop   = this.axis.scrollTopKey();\n    let offsetTop   = this.axis.offsetTopKey();\n\n    // elem = elem.nativeElement;\n    if (isNaN(window[pageYOffset])) {\n      return this.getDocumentElement()[scrollTop];\n    } else if (elem.ownerDocument) {\n      return elem.ownerDocument.defaultView[pageYOffset];\n    } else {\n      return elem[offsetTop];\n    }\n  }\n}\n\ninterface DecoratorInvocation {\n  type: Function;\n  args?: any[];\n}\n"]}