@c8y/ngx-components
Version:
Angular modules for Cumulocity IoT applications
143 lines • 23.3 kB
JavaScript
import { fromEvent, Subject } from 'rxjs';
import { debounceTime, distinctUntilChanged, takeUntil } from 'rxjs/operators';
// This is an adapted version of the original FixedSizeVirtualScrollStrategy
// https://github.com/angular/components/blob/master/src/cdk/scrolling/fixed-size-virtual-scroll.ts
export class VirtualScrollWindowStrategy {
constructor(itemSizePx, offsetSizePx, minBufferPx, maxBufferPx) {
this._viewport = null;
this._scrolledIndexChange = new Subject();
this.destroy = new Subject();
this._itemSizePx = itemSizePx;
this._offsetSizePx = offsetSizePx;
this._minBufferPx = minBufferPx;
this._maxBufferPx = maxBufferPx;
this.scrolledIndexChange = this._scrolledIndexChange.pipe(distinctUntilChanged());
this.destroy$ = this.destroy.asObservable();
}
/**
* Attaches this scroll strategy to a viewport.
* @param viewport The viewport to attach this strategy to.
*/
attach(viewport) {
this._viewport = viewport;
this._updateTotalContentSize();
this._updateRenderedRange();
fromEvent(window, 'scroll')
.pipe(takeUntil(this.destroy$), debounceTime(10))
.subscribe(() => {
this._updateRenderedRange();
});
}
/** Detaches this scroll strategy from the currently attached viewport. */
detach() {
this._scrolledIndexChange.complete();
this._viewport = null;
this.destroy.next();
this.destroy.complete();
}
/**
* Update the item size and buffer size.
* @param itemSize The size of the items in the virtually scrolling list.
* @param offsetSizePx The size of the offset (in pixels)..
* @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more
* @param maxBufferPx The amount of buffer (in pixels) to render when rendering more.
*/
updateItemAndBufferSize(itemSize, offsetSizePx, minBufferPx, maxBufferPx) {
this._itemSizePx = itemSize;
this._offsetSizePx = offsetSizePx;
this._minBufferPx = minBufferPx;
this._maxBufferPx = maxBufferPx;
this._updateTotalContentSize();
this._updateRenderedRange();
}
/** @docs-private Implemented as part of VirtualScrollStrategy. */
onContentScrolled() {
this._updateRenderedRange();
}
/** @docs-private Implemented as part of VirtualScrollStrategy. */
onDataLengthChanged() {
this._updateTotalContentSize();
this._updateRenderedRange();
}
/** @docs-private Implemented as part of VirtualScrollStrategy. */
onContentRendered() {
/* no-op */
}
/** @docs-private Implemented as part of VirtualScrollStrategy. */
onRenderedOffsetChanged() {
/* no-op */
}
/**
* Scroll to the offset for the given index.
* @param index The index of the element to scroll to.
* @param behavior The ScrollBehavior to use when scrolling.
*/
scrollToIndex(index, behavior) {
if (this._viewport) {
this._viewport.scrollToOffset(index * this._itemSizePx, behavior);
}
}
/** Update the viewport's total content size. */
_updateTotalContentSize() {
if (!this._viewport) {
return;
}
this._viewport.setTotalContentSize(this._viewport.getDataLength() * this._itemSizePx + this._offsetSizePx);
this._viewport._changeDetectorRef.detectChanges();
setTimeout(() => {
const children = this._viewport.elementRef.nativeElement.children[0].children;
if (children.length > 0) {
this._itemSizePx = children[0]?.clientHeight;
this._viewport.setTotalContentSize(this._viewport.getDataLength() * this._itemSizePx + this._offsetSizePx);
}
}, 100);
}
/** Update the viewport's rendered range. */
_updateRenderedRange() {
if (!this._viewport) {
return;
}
// Use the window as a reference for viewPort size and offset
const viewportSize = window.innerHeight;
let scrollOffset = window.pageYOffset;
const renderedRange = this._viewport.getRenderedRange();
const newRange = { start: renderedRange.start, end: renderedRange.end };
const dataLength = this._viewport.getDataLength();
// Prevent NaN as result when dividing by zero.
let firstVisibleIndex = this._itemSizePx > 0 ? scrollOffset / this._itemSizePx : 0;
// If user scrolls to the bottom of the list and data changes to a smaller list
if (newRange.end > dataLength) {
// We have to recalculate the first visible index based on new data length and viewport size.
const maxVisibleItems = Math.ceil(viewportSize / this._itemSizePx);
const newVisibleIndex = Math.max(0, Math.min(firstVisibleIndex, dataLength - maxVisibleItems));
// If first visible index changed we must update scroll offset to handle start/end buffers
// Current range must also be adjusted to cover the new position (bottom of new list).
if (firstVisibleIndex !== newVisibleIndex) {
firstVisibleIndex = newVisibleIndex;
scrollOffset = newVisibleIndex * this._itemSizePx;
newRange.start = Math.floor(firstVisibleIndex);
}
newRange.end = Math.max(0, Math.min(dataLength, newRange.start + maxVisibleItems));
}
const startBuffer = scrollOffset - newRange.start * this._itemSizePx;
if (startBuffer < this._minBufferPx && newRange.start !== 0) {
const expandStart = Math.ceil((this._maxBufferPx - startBuffer) / this._itemSizePx);
newRange.start = Math.max(0, newRange.start - expandStart);
newRange.end = Math.min(dataLength, Math.ceil(firstVisibleIndex + (viewportSize + this._minBufferPx) / this._itemSizePx));
}
else {
const endBuffer = newRange.end * this._itemSizePx - (scrollOffset + viewportSize);
if (endBuffer < this._minBufferPx && newRange.end !== dataLength) {
const expandEnd = Math.ceil((this._maxBufferPx - endBuffer) / this._itemSizePx);
if (expandEnd > 0) {
newRange.end = Math.min(dataLength, newRange.end + expandEnd);
newRange.start = Math.max(0, Math.floor(firstVisibleIndex - this._minBufferPx / this._itemSizePx));
}
}
}
this._viewport.setRenderedRange(newRange);
this._viewport.setRenderedContentOffset(this._itemSizePx * newRange.start);
this._scrolledIndexChange.next(Math.floor(firstVisibleIndex));
}
}
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{ CdkVirtualScrollViewport, VirtualScrollStrategy } from '@angular/cdk/scrolling';\nimport { fromEvent, Observable, Subject } from 'rxjs';\nimport { debounceTime, distinctUntilChanged, takeUntil } from 'rxjs/operators';\n\n// This is an adapted version of the original FixedSizeVirtualScrollStrategy\n// https://github.com/angular/components/blob/master/src/cdk/scrolling/fixed-size-virtual-scroll.ts\nexport class VirtualScrollWindowStrategy implements VirtualScrollStrategy {\n  scrolledIndexChange: Observable<number>;\n\n  private destroy$: Observable<void>;\n\n  private _viewport: CdkVirtualScrollViewport | null = null;\n\n  private _itemSizePx: number;\n  private _offsetSizePx: number;\n  private _minBufferPx: number;\n  private _maxBufferPx: number;\n\n  private readonly _scrolledIndexChange = new Subject<number>();\n  private readonly destroy = new Subject<void>();\n\n  constructor(itemSizePx: number, offsetSizePx: number, minBufferPx: number, maxBufferPx: number) {\n    this._itemSizePx = itemSizePx;\n    this._offsetSizePx = offsetSizePx;\n    this._minBufferPx = minBufferPx;\n    this._maxBufferPx = maxBufferPx;\n\n    this.scrolledIndexChange = this._scrolledIndexChange.pipe(distinctUntilChanged());\n    this.destroy$ = this.destroy.asObservable();\n  }\n\n  /**\n   * Attaches this scroll strategy to a viewport.\n   * @param viewport The viewport to attach this strategy to.\n   */\n  attach(viewport: CdkVirtualScrollViewport) {\n    this._viewport = viewport;\n    this._updateTotalContentSize();\n    this._updateRenderedRange();\n\n    fromEvent(window, 'scroll')\n      .pipe(takeUntil(this.destroy$), debounceTime(10))\n      .subscribe(() => {\n        this._updateRenderedRange();\n      });\n  }\n\n  /** Detaches this scroll strategy from the currently attached viewport. */\n  detach() {\n    this._scrolledIndexChange.complete();\n    this._viewport = null;\n\n    this.destroy.next();\n    this.destroy.complete();\n  }\n\n  /**\n   * Update the item size and buffer size.\n   * @param itemSize The size of the items in the virtually scrolling list.\n   * @param offsetSizePx The size of the offset (in pixels)..\n   * @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more\n   * @param maxBufferPx The amount of buffer (in pixels) to render when rendering more.\n   */\n  updateItemAndBufferSize(\n    itemSize: number,\n    offsetSizePx: number,\n    minBufferPx: number,\n    maxBufferPx: number\n  ) {\n    this._itemSizePx = itemSize;\n    this._offsetSizePx = offsetSizePx;\n    this._minBufferPx = minBufferPx;\n    this._maxBufferPx = maxBufferPx;\n\n    this._updateTotalContentSize();\n    this._updateRenderedRange();\n  }\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onContentScrolled() {\n    this._updateRenderedRange();\n  }\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onDataLengthChanged() {\n    this._updateTotalContentSize();\n    this._updateRenderedRange();\n  }\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onContentRendered() {\n    /* no-op */\n  }\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onRenderedOffsetChanged() {\n    /* no-op */\n  }\n\n  /**\n   * Scroll to the offset for the given index.\n   * @param index The index of the element to scroll to.\n   * @param behavior The ScrollBehavior to use when scrolling.\n   */\n  scrollToIndex(index: number, behavior: ScrollBehavior): void {\n    if (this._viewport) {\n      this._viewport.scrollToOffset(index * this._itemSizePx, behavior);\n    }\n  }\n\n  /** Update the viewport's total content size. */\n  private _updateTotalContentSize() {\n    if (!this._viewport) {\n      return;\n    }\n\n    this._viewport.setTotalContentSize(\n      this._viewport.getDataLength() * this._itemSizePx + this._offsetSizePx\n    );\n    (this._viewport as any)._changeDetectorRef.detectChanges();\n\n    setTimeout(() => {\n      const children = this._viewport.elementRef.nativeElement.children[0].children;\n      if (children.length > 0) {\n        this._itemSizePx = children[0]?.clientHeight;\n        this._viewport.setTotalContentSize(\n          this._viewport.getDataLength() * this._itemSizePx + this._offsetSizePx\n        );\n      }\n    }, 100);\n  }\n\n  /** Update the viewport's rendered range. */\n  private _updateRenderedRange() {\n    if (!this._viewport) {\n      return;\n    }\n\n    // Use the window as a reference for viewPort size and offset\n    const viewportSize = window.innerHeight;\n    let scrollOffset = window.pageYOffset;\n\n    const renderedRange = this._viewport.getRenderedRange();\n    const newRange = { start: renderedRange.start, end: renderedRange.end };\n\n    const dataLength = this._viewport.getDataLength();\n    // Prevent NaN as result when dividing by zero.\n    let firstVisibleIndex = this._itemSizePx > 0 ? scrollOffset / this._itemSizePx : 0;\n\n    // If user scrolls to the bottom of the list and data changes to a smaller list\n    if (newRange.end > dataLength) {\n      // We have to recalculate the first visible index based on new data length and viewport size.\n      const maxVisibleItems = Math.ceil(viewportSize / this._itemSizePx);\n      const newVisibleIndex = Math.max(\n        0,\n        Math.min(firstVisibleIndex, dataLength - maxVisibleItems)\n      );\n\n      // If first visible index changed we must update scroll offset to handle start/end buffers\n      // Current range must also be adjusted to cover the new position (bottom of new list).\n      if (firstVisibleIndex !== newVisibleIndex) {\n        firstVisibleIndex = newVisibleIndex;\n        scrollOffset = newVisibleIndex * this._itemSizePx;\n        newRange.start = Math.floor(firstVisibleIndex);\n      }\n\n      newRange.end = Math.max(0, Math.min(dataLength, newRange.start + maxVisibleItems));\n    }\n\n    const startBuffer = scrollOffset - newRange.start * this._itemSizePx;\n    if (startBuffer < this._minBufferPx && newRange.start !== 0) {\n      const expandStart = Math.ceil((this._maxBufferPx - startBuffer) / this._itemSizePx);\n      newRange.start = Math.max(0, newRange.start - expandStart);\n      newRange.end = Math.min(\n        dataLength,\n        Math.ceil(firstVisibleIndex + (viewportSize + this._minBufferPx) / this._itemSizePx)\n      );\n    } else {\n      const endBuffer = newRange.end * this._itemSizePx - (scrollOffset + viewportSize);\n      if (endBuffer < this._minBufferPx && newRange.end !== dataLength) {\n        const expandEnd = Math.ceil((this._maxBufferPx - endBuffer) / this._itemSizePx);\n        if (expandEnd > 0) {\n          newRange.end = Math.min(dataLength, newRange.end + expandEnd);\n          newRange.start = Math.max(\n            0,\n            Math.floor(firstVisibleIndex - this._minBufferPx / this._itemSizePx)\n          );\n        }\n      }\n    }\n\n    this._viewport.setRenderedRange(newRange);\n    this._viewport.setRenderedContentOffset(this._itemSizePx * newRange.start);\n    this._scrolledIndexChange.next(Math.floor(firstVisibleIndex));\n  }\n}\n"]}