ngx-infinite-scroller
Version:
Infinite bidirectional scroll directive for Angular 11
796 lines (776 loc) • 36.2 kB
JavaScript
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('@angular/core'), require('@angular/common'), require('rxjs'), require('rxjs/operators'), require('is-number')) :
typeof define === 'function' && define.amd ? define('ngx-infinite-scroller', ['exports', '@angular/core', '@angular/common', 'rxjs', 'rxjs/operators', 'is-number'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global['ngx-infinite-scroller'] = {}, global.ng.core, global.ng.common, global.rxjs, global.rxjs.operators, global.isNumber));
}(this, (function (exports, core, common, rxjs, operators, isNumber) { 'use strict';
function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }
var isNumber__default = /*#__PURE__*/_interopDefaultLegacy(isNumber);
/*! *****************************************************************************
Copyright (c) Microsoft Corporation.
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
***************************************************************************** */
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var DirectiveStateService = /** @class */ (function () {
function DirectiveStateService() {
}
Object.defineProperty(DirectiveStateService.prototype, "scrollTop", {
get: function () {
return this._el.nativeElement.scrollTop;
},
enumerable: false,
configurable: true
});
Object.defineProperty(DirectiveStateService.prototype, "scrollHeight", {
get: function () {
return this._el.nativeElement.scrollHeight;
},
enumerable: false,
configurable: true
});
Object.defineProperty(DirectiveStateService.prototype, "clientHeight", {
get: function () {
return this._el.nativeElement.clientHeight;
},
enumerable: false,
configurable: true
});
Object.defineProperty(DirectiveStateService.prototype, "initMode", {
get: function () {
return this._initMode;
},
set: function (initMode) {
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},
enumerable: false,
configurable: true
});
Object.defineProperty(DirectiveStateService.prototype, "scrollStreamActive", {
get: function () {
return this._scrollStreamActive;
},
set: function (active) {
this._scrollStreamActive = active;
},
enumerable: false,
configurable: true
});
Object.defineProperty(DirectiveStateService.prototype, "previousScrollPositionpUpdated", {
get: function () {
return this._previousScrollPositionpUpdated;
},
set: function (previousScrollPositionpUpdated) {
this._previousScrollPositionpUpdated = previousScrollPositionpUpdated;
},
enumerable: false,
configurable: true
});
Object.defineProperty(DirectiveStateService.prototype, "previousScrollTop", {
get: function () {
return this._previousScrollTop;
},
enumerable: false,
configurable: true
});
Object.defineProperty(DirectiveStateService.prototype, "previousScrollHeight", {
get: function () {
return this._previousScrollHeight;
},
enumerable: false,
configurable: true
});
DirectiveStateService.prototype.setup = function (params) {
this._el = params.el;
this._initMode = params.initMode;
this._scrollStreamActive = params.scrollStreamActive;
this._previousScrollPositionpUpdated = params.previousScrollPositionpUpdated;
this.updatePreviousScrollTop();
this.updatePreviousScrollHeight();
};
DirectiveStateService.prototype.updatePreviousScrollTop = function () {
this._previousScrollTop = this._el.nativeElement.scrollTop;
};
DirectiveStateService.prototype.updatePreviousScrollHeight = function () {
this._previousScrollHeight = this._el.nativeElement.scrollHeight;
};
return DirectiveStateService;
}());
DirectiveStateService.decorators = [
{ type: core.Injectable }
];
var InitialScrollPosition;
(function (InitialScrollPosition) {
InitialScrollPosition["DEFAULT"] = "DEFAULT";
InitialScrollPosition["TOP"] = "TOP";
InitialScrollPosition["MIDDLE"] = "MIDDLE";
InitialScrollPosition["BOTTOM"] = "BOTTOM";
})(InitialScrollPosition || (InitialScrollPosition = {}));
var DirectiveContext = /** @class */ (function () {
function DirectiveContext() {
}
return DirectiveContext;
}());
var StrategyBase = /** @class */ (function () {
function StrategyBase(directive, state) {
this.directive = directive;
this.state = state;
}
StrategyBase.prototype.wasScrolledDown = function (prevPos, currentPos) {
return prevPos.scrollTop < currentPos.scrollTop;
};
StrategyBase.prototype.wasScrolledUp = function (prevPos, currentPos) {
return !this.wasScrolledDown(prevPos, currentPos);
};
StrategyBase.prototype.isScrollDownEnough = function (pos, scrollPositionTrigger) {
return ((pos.scrollTop + pos.clientHeight) / pos.scrollHeight) > (scrollPositionTrigger / 100);
};
StrategyBase.prototype.isScrollUpEnough = function (pos, scrollPositionTrigger) {
return (pos.scrollTop / pos.scrollHeight) < (scrollPositionTrigger / 100);
};
StrategyBase.prototype.getInitialScrollPositionValue = function (defaultScrollPosition) {
var initialScrollPosition = this.directive.initialScrollPosition;
if (isNumber__default['default'](initialScrollPosition)) {
return Number(initialScrollPosition);
}
var initialScrollPositions = this.getInitialScrollPositions();
if (initialScrollPosition === InitialScrollPosition.DEFAULT) {
return initialScrollPositions[defaultScrollPosition];
}
return initialScrollPositions[initialScrollPosition];
};
StrategyBase.prototype.getInitialScrollPositions = function () {
var _a;
var _b = this.state, scrollHeight = _b.scrollHeight, clientHeight = _b.clientHeight;
return _a = {},
_a[InitialScrollPosition.TOP] = 0,
_a[InitialScrollPosition.MIDDLE] = scrollHeight / 2 - clientHeight / 2,
_a[InitialScrollPosition.BOTTOM] = scrollHeight,
_a;
};
return StrategyBase;
}());
var ScrollingToTop = /** @class */ (function (_super) {
__extends(ScrollingToTop, _super);
function ScrollingToTop(directive, state) {
return _super.call(this, directive, state) || this;
}
ScrollingToTop.prototype.scrollDirectionChanged = function (scrollPairChanged) {
var _this = this;
return scrollPairChanged.pipe(operators.filter(function (scrollPositions) {
return _super.prototype.wasScrolledUp.call(_this, scrollPositions[0], scrollPositions[1]);
}));
};
ScrollingToTop.prototype.scrollRequestZoneChanged = function (scrollDirectionChanged) {
var _this = this;
return scrollDirectionChanged.pipe(operators.filter(function (scrollPositions) {
return _super.prototype.isScrollUpEnough.call(_this, scrollPositions[1], _this.directive.scrollUpPercentilePositionTrigger);
}));
};
ScrollingToTop.prototype.askForUpdate = function () {
this.directive.onScrollUp.next();
};
ScrollingToTop.prototype.setInitialScrollPosition = function () {
var initialScrollPositionValue = _super.prototype.getInitialScrollPositionValue.call(this, InitialScrollPosition.BOTTOM);
this.directive.scrollTo(initialScrollPositionValue);
};
ScrollingToTop.prototype.setPreviousScrollPosition = function () {
var prevScrollPosition = this.state.previousScrollTop +
(this.state.scrollHeight - this.state.previousScrollHeight);
this.directive.scrollTo(prevScrollPosition);
};
return ScrollingToTop;
}(StrategyBase));
var ScrollingToBottom = /** @class */ (function (_super) {
__extends(ScrollingToBottom, _super);
function ScrollingToBottom(directive, state) {
return _super.call(this, directive, state) || this;
}
ScrollingToBottom.prototype.scrollDirectionChanged = function (scrollPairChanged) {
var _this = this;
return scrollPairChanged.pipe(operators.filter(function (scrollPositions) {
return _super.prototype.wasScrolledDown.call(_this, scrollPositions[0], scrollPositions[1]);
}));
};
ScrollingToBottom.prototype.scrollRequestZoneChanged = function (scrollDirectionChanged) {
var _this = this;
return scrollDirectionChanged.pipe(operators.filter(function (scrollPositions) {
return _super.prototype.isScrollDownEnough.call(_this, scrollPositions[1], _this.directive.scrollDownPercentilePositionTrigger);
}));
};
ScrollingToBottom.prototype.askForUpdate = function () {
this.directive.onScrollDown.next();
};
ScrollingToBottom.prototype.setInitialScrollPosition = function () {
var initialScrollPositionValue = _super.prototype.getInitialScrollPositionValue.call(this, InitialScrollPosition.TOP);
this.directive.scrollTo(initialScrollPositionValue);
};
ScrollingToBottom.prototype.setPreviousScrollPosition = function () {
var prevScrollPosition = this.state.previousScrollTop;
this.directive.scrollTo(prevScrollPosition);
};
return ScrollingToBottom;
}(StrategyBase));
var ScrollingToBoth = /** @class */ (function (_super) {
__extends(ScrollingToBoth, _super);
function ScrollingToBoth(directive, state) {
return _super.call(this, directive, state) || this;
}
ScrollingToBoth.prototype.scrollDirectionChanged = function (scrollPairChanged) {
return scrollPairChanged;
};
ScrollingToBoth.prototype.scrollRequestZoneChanged = function (scrollDirectionChanged) {
var _this = this;
return scrollDirectionChanged.pipe(operators.filter(function (scrollPositions) {
return (_super.prototype.isScrollUpEnough.call(_this, scrollPositions[1], _this.directive.scrollUpPercentilePositionTrigger) || _super.prototype.isScrollDownEnough.call(_this, scrollPositions[1], _this.directive.scrollDownPercentilePositionTrigger));
}), operators.tap(function (scrollPositions) {
_this.scrolledUp = _super.prototype.wasScrolledUp.call(_this, scrollPositions[0], scrollPositions[1]);
}));
};
ScrollingToBoth.prototype.askForUpdate = function () {
if (this.scrolledUp) {
this.directive.onScrollUp.next();
}
else {
this.directive.onScrollDown.next();
}
};
ScrollingToBoth.prototype.setInitialScrollPosition = function () {
var initialScrollPositionValue = _super.prototype.getInitialScrollPositionValue.call(this, InitialScrollPosition.MIDDLE);
this.directive.scrollTo(initialScrollPositionValue);
};
ScrollingToBoth.prototype.setPreviousScrollPosition = function () {
var prevScrollPosition;
if (this.scrolledUp) {
prevScrollPosition = this.state.previousScrollTop +
(this.state.scrollHeight - this.state.previousScrollHeight);
}
else {
prevScrollPosition = this.state.previousScrollTop;
}
this.directive.scrollTo(prevScrollPosition);
};
return ScrollingToBoth;
}(StrategyBase));
var ScrollHeightListener = /** @class */ (function () {
function ScrollHeightListener(directive, state) {
this.directive = directive;
this.state = state;
this.DEFAULT_REQUEST_TIMEOUT = 30000;
}
ScrollHeightListener.prototype.start = function () {
var _this = this;
this.listener = window.requestAnimationFrame(this.listen.bind(this));
if (!this.httpRequestTimeout) {
this.httpRequestTimeout = setTimeout(function () {
_this.stopIfRequestTimeout();
}, this.DEFAULT_REQUEST_TIMEOUT);
}
};
ScrollHeightListener.prototype.stop = function () {
window.cancelAnimationFrame(this.listener);
clearTimeout(this.httpRequestTimeout);
this.httpRequestTimeout = null;
};
ScrollHeightListener.prototype.listen = function () {
if (this.state.previousScrollHeight !== this.state.scrollHeight) {
this.stop();
this.directive.onScrollbarHeightChanged();
}
else {
this.start();
}
};
ScrollHeightListener.prototype.stopIfRequestTimeout = function () {
if (!this.state.previousScrollPositionpUpdated) {
this.stop();
}
};
return ScrollHeightListener;
}());
var NgxInfiniteScrollerDirective = /** @class */ (function (_super) {
__extends(NgxInfiniteScrollerDirective, _super);
function NgxInfiniteScrollerDirective(platformId, el, renderer, state) {
var _this = _super.call(this) || this;
_this.platformId = platformId;
_this.el = el;
_this.renderer = renderer;
_this.state = state;
_this.strategy = 'scrollingToBottom';
_this.initialScrollPosition = InitialScrollPosition.DEFAULT;
_this.scrollbarAnimationInterval = 100;
_this.scrollDebounceTimeAfterScrollHeightChanged = 50;
_this.scrollDebounceTimeAfterDOMMutationOnInit = 1000;
_this.scrollUpPercentilePositionTrigger = 2;
_this.scrollDownPercentilePositionTrigger = 98;
_this.onScrollUp = new core.EventEmitter();
_this.onScrollDown = new core.EventEmitter();
_this.scrollHeightChanged = new rxjs.Subject();
_this.domMutationEmitter = new rxjs.Subject();
_this.isBrowser = common.isPlatformBrowser(platformId);
_this.state.setup({
el: el,
initMode: true,
scrollStreamActive: true,
previousScrollPositionpUpdated: false
});
return _this;
}
Object.defineProperty(NgxInfiniteScrollerDirective.prototype, "scrollPairChanged", {
get: function () {
var _this = this;
if (this.scrollChanged) {
return this.scrollChanged.pipe(operators.takeWhile(function () { return _this.state.scrollStreamActive; }), operators.map(function (e) {
return {
scrollHeight: e.target.scrollHeight,
scrollTop: e.target.scrollTop,
clientHeight: e.target.clientHeight,
};
}), operators.pairwise(), operators.debounceTime(this.scrollbarAnimationInterval));
}
},
enumerable: false,
configurable: true
});
Object.defineProperty(NgxInfiniteScrollerDirective.prototype, "scrollDirectionChanged", {
get: function () {
return this.scrollingStrategy.scrollDirectionChanged(this.scrollPairChanged);
},
enumerable: false,
configurable: true
});
Object.defineProperty(NgxInfiniteScrollerDirective.prototype, "scrollRequestZoneChanged", {
get: function () {
var _this = this;
return this.scrollingStrategy.scrollRequestZoneChanged(this.scrollDirectionChanged).pipe(operators.tap(function () {
_this.state.updatePreviousScrollTop();
_this.state.updatePreviousScrollHeight();
_this.state.previousScrollPositionpUpdated = false;
_this.scrollHeightListener.start();
}));
},
enumerable: false,
configurable: true
});
NgxInfiniteScrollerDirective.prototype.ngOnInit = function () {
this.useStrategy();
this.useScrollHeightListener();
this.registerScrollEventHandler();
this.registerMutationObserver();
this.registerInitialScrollPostionHandler();
this.registerPreviousScrollPositionHandler();
};
NgxInfiniteScrollerDirective.prototype.ngAfterViewInit = function () {
this.registerScrollSpy();
};
NgxInfiniteScrollerDirective.prototype.ngOnDestroy = function () {
this.unregisterMutationObserver();
};
NgxInfiniteScrollerDirective.prototype.scrollTo = function (position) {
this.state.scrollStreamActive = false;
this.renderer.setProperty(this.el.nativeElement, 'scrollTop', position);
this.state.scrollStreamActive = true;
};
NgxInfiniteScrollerDirective.prototype.onScrollbarHeightChanged = function () {
this.scrollHeightChanged.next();
};
NgxInfiniteScrollerDirective.prototype.registerScrollEventHandler = function () {
this.scrollChanged = rxjs.fromEvent(this.el.nativeElement, 'scroll');
};
NgxInfiniteScrollerDirective.prototype.registerMutationObserver = function () {
var _this = this;
if (this.isBrowser) {
this.domMutationObserver = new MutationObserver(function (mutations) {
_this.domMutationEmitter.next(mutations);
});
var config = { attributes: true, childList: true, characterData: true };
this.domMutationObserver.observe(this.el.nativeElement, config);
}
};
NgxInfiniteScrollerDirective.prototype.registerInitialScrollPostionHandler = function () {
var _this = this;
this.domMutationEmitter.pipe(operators.takeWhile(function () { return _this.state.initMode; }), operators.debounceTime(this.scrollDebounceTimeAfterDOMMutationOnInit)).subscribe(function () {
_this.scrollingStrategy.setInitialScrollPosition();
_this.state.initMode = false;
});
};
NgxInfiniteScrollerDirective.prototype.registerPreviousScrollPositionHandler = function () {
var _this = this;
rxjs.zip(this.scrollRequestZoneChanged, this.scrollHeightChanged).pipe(operators.skipWhile(function () { return _this.state.initMode; }), operators.debounceTime(this.scrollDebounceTimeAfterScrollHeightChanged)).subscribe(function () {
_this.scrollingStrategy.setPreviousScrollPosition();
_this.state.previousScrollPositionpUpdated = true;
});
};
NgxInfiniteScrollerDirective.prototype.registerScrollSpy = function () {
var _this = this;
this.scrollRequestZoneChanged.subscribe(function () {
_this.scrollingStrategy.askForUpdate();
});
};
NgxInfiniteScrollerDirective.prototype.unregisterMutationObserver = function () {
if (this.domMutationObserver) {
this.domMutationObserver.disconnect();
}
};
NgxInfiniteScrollerDirective.prototype.useStrategy = function () {
switch (this.strategy) {
case 'scrollingToBoth':
this.scrollingStrategy = new ScrollingToBoth(this, this.state);
break;
case 'scrollingToTop':
this.scrollingStrategy = new ScrollingToTop(this, this.state);
break;
case 'scrollingToBottom':
default:
this.scrollingStrategy = new ScrollingToBottom(this, this.state);
break;
}
};
NgxInfiniteScrollerDirective.prototype.useScrollHeightListener = function () {
this.scrollHeightListener = new ScrollHeightListener(this, this.state);
};
return NgxInfiniteScrollerDirective;
}(DirectiveContext));
NgxInfiniteScrollerDirective.decorators = [
{ type: core.Directive, args: [{
selector: '[ngxInfiniteScroller]'
},] }
];
NgxInfiniteScrollerDirective.ctorParameters = function () { return [
{ type: undefined, decorators: [{ type: core.Inject, args: [core.PLATFORM_ID,] }] },
{ type: core.ElementRef },
{ type: core.Renderer2 },
{ type: DirectiveStateService }
]; };
NgxInfiniteScrollerDirective.propDecorators = {
strategy: [{ type: core.Input }],
initialScrollPosition: [{ type: core.Input }],
scrollbarAnimationInterval: [{ type: core.Input }],
scrollDebounceTimeAfterScrollHeightChanged: [{ type: core.Input }],
scrollDebounceTimeAfterDOMMutationOnInit: [{ type: core.Input }],
scrollUpPercentilePositionTrigger: [{ type: core.Input }],
scrollDownPercentilePositionTrigger: [{ type: core.Input }],
onScrollUp: [{ type: core.Output }],
onScrollDown: [{ type: core.Output }]
};
var NgxInfiniteScrollerModule = /** @class */ (function () {
function NgxInfiniteScrollerModule() {
}
return NgxInfiniteScrollerModule;
}());
NgxInfiniteScrollerModule.decorators = [
{ type: core.NgModule, args: [{
declarations: [
NgxInfiniteScrollerDirective
],
imports: [],
exports: [
NgxInfiniteScrollerDirective
],
providers: [
DirectiveStateService
],
bootstrap: []
},] }
];
/**
* Generated bundle index. Do not edit.
*/
exports.NgxInfiniteScrollerModule = NgxInfiniteScrollerModule;
exports.ɵa = NgxInfiniteScrollerDirective;
exports.ɵb = DirectiveContext;
exports.ɵc = DirectiveStateService;
Object.defineProperty(exports, '__esModule', { value: true });
})));
//# sourceMappingURL=ngx-infinite-scroller.umd.js.map