@greg-md/ng-elevator
Version:
Make a container to elevate on the screen while scrolling with Angular.
189 lines (188 loc) • 20.1 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes} checked by tsc
*/
import { Component, Input, HostBinding, HostListener, ElementRef, Renderer2, ChangeDetectionStrategy, ViewChildren, QueryList, Inject, PLATFORM_ID } from '@angular/core';
import { isPlatformBrowser } from '@angular/common';
import { offset } from './elevator.utils';
export class ElevatorComponent {
/**
* @param {?} elementRef
* @param {?} renderer
* @param {?} platformId
*/
constructor(elementRef, renderer, platformId) {
this.elementRef = elementRef;
this.renderer = renderer;
this.platformId = platformId;
this.lastPosition = 0;
this.marginTop = 0;
this.marginBottom = 0;
}
/**
* @return {?}
*/
ngAfterViewInit() {
this.initImagesLoad();
setTimeout(() => this.reloadPositions(true));
}
/**
* @return {?}
*/
windowScroll() {
this.reloadPositions();
}
/**
* @return {?}
*/
windowResize() {
this.reloadPositions(true);
}
/**
* @return {?}
*/
initImagesLoad() {
this.images.forEach(img => {
const /** @type {?} */ loadUnload = this.renderer.listen(img, 'load', () => {
this.reloadPositions(true);
loadUnload();
});
});
}
/**
* @param {?=} keepPositions
* @return {?}
*/
reloadPositions(keepPositions = false) {
if (!isPlatformBrowser(this.platformId)) {
return;
}
this.reloadYPositions(keepPositions);
}
/**
* @param {?=} keepPositions
* @return {?}
*/
reloadYPositions(keepPositions = false) {
const /** @type {?} */ styles = getComputedStyle(this.elementRef.nativeElement);
const /** @type {?} */ elevatorMarginTop = parseFloat(styles.marginTop);
const /** @type {?} */ elevatorMarginBottom = parseFloat(styles.marginBottom);
const /** @type {?} */ elevatorHeight = this.elementRef.nativeElement.offsetHeight + elevatorMarginTop + elevatorMarginBottom;
if (elevatorHeight >= this.elementRef.nativeElement.parentNode.clientHeight) {
this.setPosition();
return;
}
const /** @type {?} */ isScrollDown = window.scrollY > this.lastPosition;
this.lastPosition = window.scrollY;
const /** @type {?} */ elevatorDiff = (window.innerHeight - (elevatorHeight + this.marginTop + this.marginBottom));
const /** @type {?} */ hostPosition = this.elementRef.nativeElement.parentNode.getBoundingClientRect();
const /** @type {?} */ hostTop = (hostPosition.top * -1) + this.marginTop;
const /** @type {?} */ hostBottom = (hostPosition.bottom - window.innerHeight) + this.marginBottom;
const /** @type {?} */ elevatorPosition = this.elementRef.nativeElement.getBoundingClientRect();
const /** @type {?} */ elevatorTop = (elevatorPosition.top * -1) + elevatorMarginTop + this.marginTop;
const /** @type {?} */ elevatorBottom = (elevatorPosition.bottom - window.innerHeight) + elevatorMarginBottom + this.marginBottom;
const /** @type {?} */ elevatorWidth = parseFloat(this.elementRef.nativeElement.parentNode.clientWidth)
- parseFloat(styles.marginLeft)
- parseFloat(styles.marginRight);
if (elevatorDiff >= 0 ? hostTop <= 0 : elevatorBottom > 0 && (!this.cssPosition || hostTop <= 0)) {
this.setPosition();
}
else {
if (elevatorDiff >= 0) {
if (hostBottom + elevatorDiff <= 0) {
this.setPosition('absolute', null, 0, elevatorWidth);
}
else {
this.setPosition('fixed', this.marginTop, null, elevatorWidth);
}
}
else {
this.setPosition('absolute', offset(this.elementRef.nativeElement).top - offset(this.elementRef.nativeElement.parentNode).top - elevatorMarginTop, null, elevatorWidth);
if (isScrollDown || keepPositions) {
if (hostBottom <= 0) {
this.setPosition('absolute', null, 0, elevatorWidth);
}
else if (elevatorBottom <= 0) {
this.setPosition('fixed', null, this.marginBottom);
}
}
else {
if (elevatorTop <= 0) {
this.setPosition('fixed', this.marginTop, null, elevatorWidth);
}
}
}
}
}
/**
* @return {?}
*/
prepareAbsolutePositions() {
const /** @type {?} */ styles = getComputedStyle(this.elementRef.nativeElement);
const /** @type {?} */ elevatorMarginTop = parseFloat(styles.marginTop);
this.setPosition('absolute', offset(this.elementRef.nativeElement).top - offset(this.elementRef.nativeElement.parentNode).top - elevatorMarginTop);
}
/**
* @param {?=} position
* @param {?=} top
* @param {?=} bottom
* @param {?=} width
* @return {?}
*/
setPosition(position = null, top = null, bottom = null, width = null) {
this.cssPosition = position;
this.cssTop = top;
this.cssBottom = bottom;
this.cssWidth = width;
}
}
ElevatorComponent.decorators = [
{ type: Component, args: [{
selector: 'greg-elevator',
template: '<ng-content></ng-content>',
styles: [':host { display: block; }'],
changeDetection: ChangeDetectionStrategy.OnPush,
},] },
];
/** @nocollapse */
ElevatorComponent.ctorParameters = () => [
{ type: ElementRef },
{ type: Renderer2 },
{ type: String, decorators: [{ type: Inject, args: [PLATFORM_ID,] }] }
];
ElevatorComponent.propDecorators = {
marginTop: [{ type: Input }],
marginBottom: [{ type: Input }],
cssPosition: [{ type: HostBinding, args: ['style.position',] }],
cssTop: [{ type: HostBinding, args: ['style.top.px',] }],
cssBottom: [{ type: HostBinding, args: ['style.bottom.px',] }],
cssWidth: [{ type: HostBinding, args: ['style.width.px',] }],
images: [{ type: ViewChildren, args: ['img',] }],
windowScroll: [{ type: HostListener, args: ['window:scroll',] }],
windowResize: [{ type: HostListener, args: ['window:resize',] }]
};
function ElevatorComponent_tsickle_Closure_declarations() {
/** @type {?} */
ElevatorComponent.prototype.lastPosition;
/** @type {?} */
ElevatorComponent.prototype.marginTop;
/** @type {?} */
ElevatorComponent.prototype.marginBottom;
/** @type {?} */
ElevatorComponent.prototype.cssPosition;
/** @type {?} */
ElevatorComponent.prototype.cssTop;
/** @type {?} */
ElevatorComponent.prototype.cssBottom;
/** @type {?} */
ElevatorComponent.prototype.cssWidth;
/** @type {?} */
ElevatorComponent.prototype.images;
/** @type {?} */
ElevatorComponent.prototype.elementRef;
/** @type {?} */
ElevatorComponent.prototype.renderer;
/** @type {?} */
ElevatorComponent.prototype.platformId;
}
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{\n  Component,\n  Input,\n  HostBinding,\n  HostListener,\n  ElementRef,\n  AfterViewInit,\n  Renderer2,\n  ChangeDetectionStrategy,\n  ViewChildren,\n  QueryList,\n  Inject,\n  PLATFORM_ID\n} from '@angular/core';\nimport { isPlatformBrowser } from '@angular/common';\n\nimport { offset } from './elevator.utils';\n\n@Component({\n  selector: 'greg-elevator',\n  template: '<ng-content></ng-content>',\n  styles: [':host { display: block; }'],\n  changeDetection: ChangeDetectionStrategy.OnPush,\n})\nexport class ElevatorComponent implements AfterViewInit {\n  lastPosition = 0;\n\n  @Input() marginTop = 0;\n  @Input() marginBottom = 0;\n\n  @HostBinding('style.position') cssPosition: string;\n\n  @HostBinding('style.top.px') cssTop: number;\n\n  @HostBinding('style.bottom.px') cssBottom: number;\n\n  @HostBinding('style.width.px') cssWidth: number;\n\n  @ViewChildren('img') images: QueryList<any>;\n\n  constructor(\n    private elementRef: ElementRef,\n    private renderer: Renderer2,\n    @Inject(PLATFORM_ID) private platformId: string\n  ) {\n  }\n\n  ngAfterViewInit() {\n    this.initImagesLoad();\n\n    setTimeout(() => this.reloadPositions(true));\n  }\n\n  @HostListener('window:scroll')\n  windowScroll() {\n    this.reloadPositions();\n  }\n\n  @HostListener('window:resize')\n  windowResize() {\n    this.reloadPositions(true);\n  }\n\n  initImagesLoad() {\n    this.images.forEach(img => {\n      const loadUnload = this.renderer.listen(img, 'load', () => {\n        this.reloadPositions(true);\n\n        loadUnload();\n      });\n    });\n  }\n\n  reloadPositions(keepPositions = false) {\n    if (!isPlatformBrowser(this.platformId)) {\n      return;\n    }\n\n    this.reloadYPositions(keepPositions);\n  }\n\n  reloadYPositions(keepPositions = false) {\n    const styles = getComputedStyle(this.elementRef.nativeElement);\n\n    const elevatorMarginTop = parseFloat(styles.marginTop);\n    const elevatorMarginBottom = parseFloat(styles.marginBottom);\n\n    const elevatorHeight = this.elementRef.nativeElement.offsetHeight + elevatorMarginTop + elevatorMarginBottom;\n\n    if (elevatorHeight >= this.elementRef.nativeElement.parentNode.clientHeight) {\n      this.setPosition();\n\n      return;\n    }\n\n    const isScrollDown = window.scrollY > this.lastPosition;\n\n    this.lastPosition = window.scrollY;\n\n    const elevatorDiff = (window.innerHeight - (elevatorHeight + this.marginTop + this.marginBottom));\n\n    const hostPosition = this.elementRef.nativeElement.parentNode.getBoundingClientRect();\n\n    const hostTop = (hostPosition.top * -1) + this.marginTop;\n\n    const hostBottom = (hostPosition.bottom - window.innerHeight) + this.marginBottom;\n\n    const elevatorPosition = this.elementRef.nativeElement.getBoundingClientRect();\n\n    const elevatorTop = (elevatorPosition.top * -1) + elevatorMarginTop + this.marginTop;\n\n    const elevatorBottom = (elevatorPosition.bottom - window.innerHeight) + elevatorMarginBottom + this.marginBottom;\n\n    const elevatorWidth = parseFloat(this.elementRef.nativeElement.parentNode.clientWidth)\n      - parseFloat(styles.marginLeft)\n      - parseFloat(styles.marginRight);\n\n    if (elevatorDiff >= 0 ? hostTop <= 0 : elevatorBottom > 0 && (!this.cssPosition || hostTop <= 0)) {\n      this.setPosition();\n    } else {\n      if (elevatorDiff >= 0) {\n        if (hostBottom + elevatorDiff <= 0) {\n          this.setPosition('absolute', null, 0, elevatorWidth);\n        } else {\n          this.setPosition('fixed', this.marginTop, null, elevatorWidth);\n        }\n      } else {\n        this.setPosition(\n          'absolute',\n          offset(this.elementRef.nativeElement).top - offset(this.elementRef.nativeElement.parentNode).top - elevatorMarginTop,\n          null,\n          elevatorWidth\n        );\n\n        if (isScrollDown || keepPositions) {\n          if (hostBottom <= 0) {\n            this.setPosition('absolute', null, 0, elevatorWidth);\n          } else if (elevatorBottom <= 0) {\n            this.setPosition('fixed', null, this.marginBottom);\n          }\n        } else {\n          if (elevatorTop <= 0) {\n            this.setPosition('fixed', this.marginTop, null, elevatorWidth);\n          }\n        }\n      }\n    }\n  }\n\n  prepareAbsolutePositions() {\n    const styles = getComputedStyle(this.elementRef.nativeElement);\n\n    const elevatorMarginTop = parseFloat(styles.marginTop);\n\n    this.setPosition(\n      'absolute',\n      offset(this.elementRef.nativeElement).top - offset(this.elementRef.nativeElement.parentNode).top - elevatorMarginTop\n    );\n  }\n\n  setPosition(position: string = null, top: number = null, bottom: number = null, width: number = null) {\n    this.cssPosition = position;\n    this.cssTop = top;\n    this.cssBottom = bottom;\n    this.cssWidth = width;\n  }\n}\n"]}