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

"use strict";
var core_1 = require('@angular/core');
var ScrollResolver = (function () {
    function ScrollResolver() {
        this.lastScrollPosition = 0;
    }
    ScrollResolver.prototype.shouldScroll = function (container, config, scrollingDown) {
        var distance = config.distance;
        var remaining;
        var containerBreakpoint;
        if (scrollingDown) {
            remaining = container.totalToScroll - container.scrolledUntilNow;
            containerBreakpoint = container.height * distance.down + 1;
        }
        else {
            remaining = container.scrolledUntilNow;
            containerBreakpoint = container.height * distance.up + 1;
        }
        var shouldScroll = remaining <= containerBreakpoint;
        this.lastScrollPosition = container.scrolledUntilNow;
        return shouldScroll;
    };
    ScrollResolver.prototype.isScrollingDown = function (container) {
        return this.lastScrollPosition < container.scrolledUntilNow;
    };
    ScrollResolver.prototype.getScrollStats = function (container, config) {
        var isScrollingDown = this.isScrollingDown(container);
        var shouldScroll = this.shouldScroll(container, config, isScrollingDown);
        return { isScrollingDown: isScrollingDown, shouldScroll: shouldScroll };
    };
    ScrollResolver.decorators = [
        { type: core_1.Injectable },
    ];
    /** @nocollapse */
    ScrollResolver.ctorParameters = function () { return []; };
    return ScrollResolver;
}());
exports.ScrollResolver = ScrollResolver;
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