1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | import { coerceNumberProperty } from '@angular/cdk/coercion';
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9 | import { Directive, forwardRef, Input } from '@angular/core';
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10 | import { Subject } from 'rxjs';
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11 | import { distinctUntilChanged } from 'rxjs/operators';
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12 | import { VIRTUAL_SCROLL_STRATEGY } from './virtual-scroll-strategy';
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13 | import * as i0 from "@angular/core";
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14 | /** Virtual scrolling strategy for lists with items of known fixed size. */
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15 | export class FixedSizeVirtualScrollStrategy {
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16 | /**
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17 | * @param itemSize The size of the items in the virtually scrolling list.
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18 | * @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more
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19 | * @param maxBufferPx The amount of buffer (in pixels) to render when rendering more.
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20 | */
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21 | constructor(itemSize, minBufferPx, maxBufferPx) {
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22 | this._scrolledIndexChange = new Subject();
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23 | /** @docs-private Implemented as part of VirtualScrollStrategy. */
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24 | this.scrolledIndexChange = this._scrolledIndexChange.pipe(distinctUntilChanged());
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25 | /** The attached viewport. */
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26 | this._viewport = null;
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27 | this._itemSize = itemSize;
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28 | this._minBufferPx = minBufferPx;
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29 | this._maxBufferPx = maxBufferPx;
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30 | }
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31 | /**
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32 | * Attaches this scroll strategy to a viewport.
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33 | * @param viewport The viewport to attach this strategy to.
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34 | */
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35 | attach(viewport) {
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36 | this._viewport = viewport;
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37 | this._updateTotalContentSize();
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38 | this._updateRenderedRange();
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39 | }
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40 | /** Detaches this scroll strategy from the currently attached viewport. */
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41 | detach() {
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42 | this._scrolledIndexChange.complete();
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43 | this._viewport = null;
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44 | }
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45 | /**
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46 | * Update the item size and buffer size.
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47 | * @param itemSize The size of the items in the virtually scrolling list.
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48 | * @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more
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49 | * @param maxBufferPx The amount of buffer (in pixels) to render when rendering more.
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50 | */
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51 | updateItemAndBufferSize(itemSize, minBufferPx, maxBufferPx) {
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52 | if (maxBufferPx < minBufferPx && (typeof ngDevMode === 'undefined' || ngDevMode)) {
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53 | throw Error('CDK virtual scroll: maxBufferPx must be greater than or equal to minBufferPx');
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54 | }
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55 | this._itemSize = itemSize;
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56 | this._minBufferPx = minBufferPx;
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57 | this._maxBufferPx = maxBufferPx;
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58 | this._updateTotalContentSize();
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59 | this._updateRenderedRange();
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60 | }
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61 | /** @docs-private Implemented as part of VirtualScrollStrategy. */
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62 | onContentScrolled() {
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63 | this._updateRenderedRange();
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64 | }
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65 | /** @docs-private Implemented as part of VirtualScrollStrategy. */
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66 | onDataLengthChanged() {
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67 | this._updateTotalContentSize();
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68 | this._updateRenderedRange();
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69 | }
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70 | /** @docs-private Implemented as part of VirtualScrollStrategy. */
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71 | onContentRendered() {
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72 | /* no-op */
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73 | }
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74 | /** @docs-private Implemented as part of VirtualScrollStrategy. */
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75 | onRenderedOffsetChanged() {
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76 | /* no-op */
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77 | }
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78 | /**
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79 | * Scroll to the offset for the given index.
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80 | * @param index The index of the element to scroll to.
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81 | * @param behavior The ScrollBehavior to use when scrolling.
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82 | */
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83 | scrollToIndex(index, behavior) {
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84 | if (this._viewport) {
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85 | this._viewport.scrollToOffset(index * this._itemSize, behavior);
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86 | }
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87 | }
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88 | /** Update the viewport's total content size. */
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89 | _updateTotalContentSize() {
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90 | if (!this._viewport) {
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91 | return;
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92 | }
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93 | this._viewport.setTotalContentSize(this._viewport.getDataLength() * this._itemSize);
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94 | }
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95 | /** Update the viewport's rendered range. */
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96 | _updateRenderedRange() {
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97 | if (!this._viewport) {
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98 | return;
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99 | }
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100 | const renderedRange = this._viewport.getRenderedRange();
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101 | const newRange = { start: renderedRange.start, end: renderedRange.end };
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102 | const viewportSize = this._viewport.getViewportSize();
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103 | const dataLength = this._viewport.getDataLength();
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104 | let scrollOffset = this._viewport.measureScrollOffset();
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105 | // Prevent NaN as result when dividing by zero.
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106 | let firstVisibleIndex = this._itemSize > 0 ? scrollOffset / this._itemSize : 0;
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107 | // If user scrolls to the bottom of the list and data changes to a smaller list
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108 | if (newRange.end > dataLength) {
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109 | // We have to recalculate the first visible index based on new data length and viewport size.
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110 | const maxVisibleItems = Math.ceil(viewportSize / this._itemSize);
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111 | const newVisibleIndex = Math.max(0, Math.min(firstVisibleIndex, dataLength - maxVisibleItems));
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112 | // If first visible index changed we must update scroll offset to handle start/end buffers
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113 | // Current range must also be adjusted to cover the new position (bottom of new list).
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114 | if (firstVisibleIndex != newVisibleIndex) {
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115 | firstVisibleIndex = newVisibleIndex;
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116 | scrollOffset = newVisibleIndex * this._itemSize;
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117 | newRange.start = Math.floor(firstVisibleIndex);
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118 | }
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119 | newRange.end = Math.max(0, Math.min(dataLength, newRange.start + maxVisibleItems));
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120 | }
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121 | const startBuffer = scrollOffset - newRange.start * this._itemSize;
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122 | if (startBuffer < this._minBufferPx && newRange.start != 0) {
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123 | const expandStart = Math.ceil((this._maxBufferPx - startBuffer) / this._itemSize);
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124 | newRange.start = Math.max(0, newRange.start - expandStart);
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125 | newRange.end = Math.min(dataLength, Math.ceil(firstVisibleIndex + (viewportSize + this._minBufferPx) / this._itemSize));
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126 | }
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127 | else {
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128 | const endBuffer = newRange.end * this._itemSize - (scrollOffset + viewportSize);
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129 | if (endBuffer < this._minBufferPx && newRange.end != dataLength) {
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130 | const expandEnd = Math.ceil((this._maxBufferPx - endBuffer) / this._itemSize);
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131 | if (expandEnd > 0) {
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132 | newRange.end = Math.min(dataLength, newRange.end + expandEnd);
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133 | newRange.start = Math.max(0, Math.floor(firstVisibleIndex - this._minBufferPx / this._itemSize));
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134 | }
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135 | }
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136 | }
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137 | this._viewport.setRenderedRange(newRange);
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138 | this._viewport.setRenderedContentOffset(this._itemSize * newRange.start);
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139 | this._scrolledIndexChange.next(Math.floor(firstVisibleIndex));
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140 | }
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141 | }
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142 | /**
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143 | * Provider factory for `FixedSizeVirtualScrollStrategy` that simply extracts the already created
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144 | * `FixedSizeVirtualScrollStrategy` from the given directive.
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145 | * @param fixedSizeDir The instance of `CdkFixedSizeVirtualScroll` to extract the
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146 | * `FixedSizeVirtualScrollStrategy` from.
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147 | */
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148 | export function _fixedSizeVirtualScrollStrategyFactory(fixedSizeDir) {
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149 | return fixedSizeDir._scrollStrategy;
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150 | }
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151 | /** A virtual scroll strategy that supports fixed-size items. */
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152 | class CdkFixedSizeVirtualScroll {
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153 | constructor() {
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154 | this._itemSize = 20;
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155 | this._minBufferPx = 100;
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156 | this._maxBufferPx = 200;
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157 | /** The scroll strategy used by this directive. */
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158 | this._scrollStrategy = new FixedSizeVirtualScrollStrategy(this.itemSize, this.minBufferPx, this.maxBufferPx);
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159 | }
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160 | /** The size of the items in the list (in pixels). */
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161 | get itemSize() {
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162 | return this._itemSize;
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163 | }
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164 | set itemSize(value) {
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165 | this._itemSize = coerceNumberProperty(value);
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166 | }
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167 | /**
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168 | * The minimum amount of buffer rendered beyond the viewport (in pixels).
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169 | * If the amount of buffer dips below this number, more items will be rendered. Defaults to 100px.
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170 | */
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171 | get minBufferPx() {
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172 | return this._minBufferPx;
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173 | }
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174 | set minBufferPx(value) {
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175 | this._minBufferPx = coerceNumberProperty(value);
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176 | }
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177 | /**
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178 | * The number of pixels worth of buffer to render for when rendering new items. Defaults to 200px.
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179 | */
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180 | get maxBufferPx() {
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181 | return this._maxBufferPx;
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182 | }
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183 | set maxBufferPx(value) {
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184 | this._maxBufferPx = coerceNumberProperty(value);
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185 | }
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186 | ngOnChanges() {
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187 | this._scrollStrategy.updateItemAndBufferSize(this.itemSize, this.minBufferPx, this.maxBufferPx);
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188 | }
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189 | static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: CdkFixedSizeVirtualScroll, deps: [], target: i0.ɵɵFactoryTarget.Directive }); }
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190 | static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.0.0", type: CdkFixedSizeVirtualScroll, isStandalone: true, selector: "cdk-virtual-scroll-viewport[itemSize]", inputs: { itemSize: "itemSize", minBufferPx: "minBufferPx", maxBufferPx: "maxBufferPx" }, providers: [
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191 | {
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192 | provide: VIRTUAL_SCROLL_STRATEGY,
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193 | useFactory: _fixedSizeVirtualScrollStrategyFactory,
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194 | deps: [forwardRef(() => CdkFixedSizeVirtualScroll)],
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195 | },
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196 | ], usesOnChanges: true, ngImport: i0 }); }
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197 | }
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198 | export { CdkFixedSizeVirtualScroll };
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199 | i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: CdkFixedSizeVirtualScroll, decorators: [{
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200 | type: Directive,
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201 | args: [{
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202 | selector: 'cdk-virtual-scroll-viewport[itemSize]',
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203 | standalone: true,
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204 | providers: [
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205 | {
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206 | provide: VIRTUAL_SCROLL_STRATEGY,
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207 | useFactory: _fixedSizeVirtualScrollStrategyFactory,
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208 | deps: [forwardRef(() => CdkFixedSizeVirtualScroll)],
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209 | },
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210 | ],
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211 | }]
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212 | }], propDecorators: { itemSize: [{
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213 | type: Input
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214 | }], minBufferPx: [{
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215 | type: Input
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216 | }], maxBufferPx: [{
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217 | type: Input
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218 | }] } });
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {coerceNumberProperty, NumberInput} from '@angular/cdk/coercion';\nimport {Directive, forwardRef, Input, OnChanges} from '@angular/core';\nimport {Observable, Subject} from 'rxjs';\nimport {distinctUntilChanged} from 'rxjs/operators';\nimport {VIRTUAL_SCROLL_STRATEGY, VirtualScrollStrategy} from './virtual-scroll-strategy';\nimport {CdkVirtualScrollViewport} from './virtual-scroll-viewport';\n\n/** Virtual scrolling strategy for lists with items of known fixed size. */\nexport class FixedSizeVirtualScrollStrategy implements VirtualScrollStrategy {\n  private readonly _scrolledIndexChange = new Subject<number>();\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  scrolledIndexChange: Observable<number> = this._scrolledIndexChange.pipe(distinctUntilChanged());\n\n  /** The attached viewport. */\n  private _viewport: CdkVirtualScrollViewport | null = null;\n\n  /** The size of the items in the virtually scrolling list. */\n  private _itemSize: number;\n\n  /** The minimum amount of buffer rendered beyond the viewport (in pixels). */\n  private _minBufferPx: number;\n\n  /** The number of buffer items to render beyond the edge of the viewport (in pixels). */\n  private _maxBufferPx: number;\n\n  /**\n   * @param itemSize The size of the items in the virtually scrolling list.\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  constructor(itemSize: number, minBufferPx: number, maxBufferPx: number) {\n    this._itemSize = itemSize;\n    this._minBufferPx = minBufferPx;\n    this._maxBufferPx = maxBufferPx;\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\n  /** Detaches this scroll strategy from the currently attached viewport. */\n  detach() {\n    this._scrolledIndexChange.complete();\n    this._viewport = null;\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 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(itemSize: number, minBufferPx: number, maxBufferPx: number) {\n    if (maxBufferPx < minBufferPx && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error('CDK virtual scroll: maxBufferPx must be greater than or equal to minBufferPx');\n    }\n    this._itemSize = itemSize;\n    this._minBufferPx = minBufferPx;\n    this._maxBufferPx = maxBufferPx;\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._itemSize, 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(this._viewport.getDataLength() * this._itemSize);\n  }\n\n  /** Update the viewport's rendered range. */\n  private _updateRenderedRange() {\n    if (!this._viewport) {\n      return;\n    }\n\n    const renderedRange = this._viewport.getRenderedRange();\n    const newRange = {start: renderedRange.start, end: renderedRange.end};\n    const viewportSize = this._viewport.getViewportSize();\n    const dataLength = this._viewport.getDataLength();\n    let scrollOffset = this._viewport.measureScrollOffset();\n    // Prevent NaN as result when dividing by zero.\n    let firstVisibleIndex = this._itemSize > 0 ? scrollOffset / this._itemSize : 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._itemSize);\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._itemSize;\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._itemSize;\n    if (startBuffer < this._minBufferPx && newRange.start != 0) {\n      const expandStart = Math.ceil((this._maxBufferPx - startBuffer) / this._itemSize);\n      newRange.start = Math.max(0, newRange.start - expandStart);\n      newRange.end = Math.min(\n        dataLength,\n        Math.ceil(firstVisibleIndex + (viewportSize + this._minBufferPx) / this._itemSize),\n      );\n    } else {\n      const endBuffer = newRange.end * this._itemSize - (scrollOffset + viewportSize);\n      if (endBuffer < this._minBufferPx && newRange.end != dataLength) {\n        const expandEnd = Math.ceil((this._maxBufferPx - endBuffer) / this._itemSize);\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._itemSize),\n          );\n        }\n      }\n    }\n\n    this._viewport.setRenderedRange(newRange);\n    this._viewport.setRenderedContentOffset(this._itemSize * newRange.start);\n    this._scrolledIndexChange.next(Math.floor(firstVisibleIndex));\n  }\n}\n\n/**\n * Provider factory for `FixedSizeVirtualScrollStrategy` that simply extracts the already created\n * `FixedSizeVirtualScrollStrategy` from the given directive.\n * @param fixedSizeDir The instance of `CdkFixedSizeVirtualScroll` to extract the\n *     `FixedSizeVirtualScrollStrategy` from.\n */\nexport function _fixedSizeVirtualScrollStrategyFactory(fixedSizeDir: CdkFixedSizeVirtualScroll) {\n  return fixedSizeDir._scrollStrategy;\n}\n\n/** A virtual scroll strategy that supports fixed-size items. */\n@Directive({\n  selector: 'cdk-virtual-scroll-viewport[itemSize]',\n  standalone: true,\n  providers: [\n    {\n      provide: VIRTUAL_SCROLL_STRATEGY,\n      useFactory: _fixedSizeVirtualScrollStrategyFactory,\n      deps: [forwardRef(() => CdkFixedSizeVirtualScroll)],\n    },\n  ],\n})\nexport class CdkFixedSizeVirtualScroll implements OnChanges {\n  /** The size of the items in the list (in pixels). */\n  @Input()\n  get itemSize(): number {\n    return this._itemSize;\n  }\n  set itemSize(value: NumberInput) {\n    this._itemSize = coerceNumberProperty(value);\n  }\n  _itemSize = 20;\n\n  /**\n   * The minimum amount of buffer rendered beyond the viewport (in pixels).\n   * If the amount of buffer dips below this number, more items will be rendered. Defaults to 100px.\n   */\n  @Input()\n  get minBufferPx(): number {\n    return this._minBufferPx;\n  }\n  set minBufferPx(value: NumberInput) {\n    this._minBufferPx = coerceNumberProperty(value);\n  }\n  _minBufferPx = 100;\n\n  /**\n   * The number of pixels worth of buffer to render for when rendering new items. Defaults to 200px.\n   */\n  @Input()\n  get maxBufferPx(): number {\n    return this._maxBufferPx;\n  }\n  set maxBufferPx(value: NumberInput) {\n    this._maxBufferPx = coerceNumberProperty(value);\n  }\n  _maxBufferPx = 200;\n\n  /** The scroll strategy used by this directive. */\n  _scrollStrategy = new FixedSizeVirtualScrollStrategy(\n    this.itemSize,\n    this.minBufferPx,\n    this.maxBufferPx,\n  );\n\n  ngOnChanges() {\n    this._scrollStrategy.updateItemAndBufferSize(this.itemSize, this.minBufferPx, this.maxBufferPx);\n  }\n}\n"]} |
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