| 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 | /**
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| 9 | * List of all possible directions that can be used for sticky positioning.
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| 10 | * @docs-private
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| 11 | */
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| 12 | export const STICKY_DIRECTIONS = ['top', 'bottom', 'left', 'right'];
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| 13 | /**
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| 14 | * Applies and removes sticky positioning styles to the `CdkTable` rows and columns cells.
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| 15 | * @docs-private
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| 16 | */
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| 17 | export class StickyStyler {
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| 18 | /**
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| 19 | * @param _isNativeHtmlTable Whether the sticky logic should be based on a table
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| 20 | * that uses the native `<table>` element.
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| 21 | * @param _stickCellCss The CSS class that will be applied to every row/cell that has
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| 22 | * sticky positioning applied.
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| 23 | * @param direction The directionality context of the table (ltr/rtl); affects column positioning
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| 24 | * by reversing left/right positions.
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| 25 | * @param _isBrowser Whether the table is currently being rendered on the server or the client.
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| 26 | * @param _needsPositionStickyOnElement Whether we need to specify position: sticky on cells
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| 27 | * using inline styles. If false, it is assumed that position: sticky is included in
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| 28 | * the component stylesheet for _stickCellCss.
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| 29 | * @param _positionListener A listener that is notified of changes to sticky rows/columns
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| 30 | * and their dimensions.
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| 31 | */
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| 32 | constructor(_isNativeHtmlTable, _stickCellCss, direction, _coalescedStyleScheduler, _isBrowser = true, _needsPositionStickyOnElement = true, _positionListener) {
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| 33 | this._isNativeHtmlTable = _isNativeHtmlTable;
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| 34 | this._stickCellCss = _stickCellCss;
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| 35 | this.direction = direction;
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| 36 | this._coalescedStyleScheduler = _coalescedStyleScheduler;
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| 37 | this._isBrowser = _isBrowser;
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| 38 | this._needsPositionStickyOnElement = _needsPositionStickyOnElement;
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| 39 | this._positionListener = _positionListener;
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| 40 | this._cachedCellWidths = [];
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| 41 | this._borderCellCss = {
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| 42 | 'top': `${_stickCellCss}-border-elem-top`,
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| 43 | 'bottom': `${_stickCellCss}-border-elem-bottom`,
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| 44 | 'left': `${_stickCellCss}-border-elem-left`,
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| 45 | 'right': `${_stickCellCss}-border-elem-right`,
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| 46 | };
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| 47 | }
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| 48 | /**
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| 49 | * Clears the sticky positioning styles from the row and its cells by resetting the `position`
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| 50 | * style, setting the zIndex to 0, and unsetting each provided sticky direction.
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| 51 | * @param rows The list of rows that should be cleared from sticking in the provided directions
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| 52 | * @param stickyDirections The directions that should no longer be set as sticky on the rows.
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| 53 | */
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| 54 | clearStickyPositioning(rows, stickyDirections) {
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| 55 | const elementsToClear = [];
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| 56 | for (const row of rows) {
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| 57 | // If the row isn't an element (e.g. if it's an `ng-container`),
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| 58 | // it won't have inline styles or `children` so we skip it.
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| 59 | if (row.nodeType !== row.ELEMENT_NODE) {
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| 60 | continue;
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| 61 | }
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| 62 | elementsToClear.push(row);
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| 63 | for (let i = 0; i < row.children.length; i++) {
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| 64 | elementsToClear.push(row.children[i]);
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| 65 | }
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| 66 | }
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| 67 | // Coalesce with sticky row/column updates (and potentially other changes like column resize).
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| 68 | this._coalescedStyleScheduler.schedule(() => {
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| 69 | for (const element of elementsToClear) {
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| 70 | this._removeStickyStyle(element, stickyDirections);
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| 71 | }
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| 72 | });
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| 73 | }
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| 74 | /**
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| 75 | * Applies sticky left and right positions to the cells of each row according to the sticky
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| 76 | * states of the rendered column definitions.
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| 77 | * @param rows The rows that should have its set of cells stuck according to the sticky states.
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| 78 | * @param stickyStartStates A list of boolean states where each state represents whether the cell
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| 79 | * in this index position should be stuck to the start of the row.
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| 80 | * @param stickyEndStates A list of boolean states where each state represents whether the cell
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| 81 | * in this index position should be stuck to the end of the row.
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| 82 | * @param recalculateCellWidths Whether the sticky styler should recalculate the width of each
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| 83 | * column cell. If `false` cached widths will be used instead.
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| 84 | */
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| 85 | updateStickyColumns(rows, stickyStartStates, stickyEndStates, recalculateCellWidths = true) {
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| 86 | if (!rows.length || !this._isBrowser || !(stickyStartStates.some(state => state) ||
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| 87 | stickyEndStates.some(state => state))) {
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| 88 | if (this._positionListener) {
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| 89 | this._positionListener.stickyColumnsUpdated({ sizes: [] });
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| 90 | this._positionListener.stickyEndColumnsUpdated({ sizes: [] });
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| 91 | }
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| 92 | return;
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| 93 | }
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| 94 | const firstRow = rows[0];
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| 95 | const numCells = firstRow.children.length;
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| 96 | const cellWidths = this._getCellWidths(firstRow, recalculateCellWidths);
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| 97 | const startPositions = this._getStickyStartColumnPositions(cellWidths, stickyStartStates);
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| 98 | const endPositions = this._getStickyEndColumnPositions(cellWidths, stickyEndStates);
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| 99 | const lastStickyStart = stickyStartStates.lastIndexOf(true);
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| 100 | const firstStickyEnd = stickyEndStates.indexOf(true);
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| 101 | // Coalesce with sticky row updates (and potentially other changes like column resize).
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| 102 | this._coalescedStyleScheduler.schedule(() => {
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| 103 | const isRtl = this.direction === 'rtl';
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| 104 | const start = isRtl ? 'right' : 'left';
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| 105 | const end = isRtl ? 'left' : 'right';
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| 106 | for (const row of rows) {
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| 107 | for (let i = 0; i < numCells; i++) {
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| 108 | const cell = row.children[i];
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| 109 | if (stickyStartStates[i]) {
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| 110 | this._addStickyStyle(cell, start, startPositions[i], i === lastStickyStart);
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| 111 | }
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| 112 | if (stickyEndStates[i]) {
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| 113 | this._addStickyStyle(cell, end, endPositions[i], i === firstStickyEnd);
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| 114 | }
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| 115 | }
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| 116 | }
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| 117 | if (this._positionListener) {
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| 118 | this._positionListener.stickyColumnsUpdated({
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| 119 | sizes: lastStickyStart === -1 ?
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| 120 | [] :
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| 121 | cellWidths
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| 122 | .slice(0, lastStickyStart + 1)
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| 123 | .map((width, index) => stickyStartStates[index] ? width : null)
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| 124 | });
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| 125 | this._positionListener.stickyEndColumnsUpdated({
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| 126 | sizes: firstStickyEnd === -1 ?
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| 127 | [] :
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| 128 | cellWidths
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| 129 | .slice(firstStickyEnd)
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| 130 | .map((width, index) => stickyEndStates[index + firstStickyEnd] ? width : null)
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| 131 | .reverse()
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| 132 | });
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| 133 | }
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| 134 | });
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| 135 | }
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| 136 | /**
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| 137 | * Applies sticky positioning to the row's cells if using the native table layout, and to the
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| 138 | * row itself otherwise.
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| 139 | * @param rowsToStick The list of rows that should be stuck according to their corresponding
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| 140 | * sticky state and to the provided top or bottom position.
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| 141 | * @param stickyStates A list of boolean states where each state represents whether the row
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| 142 | * should be stuck in the particular top or bottom position.
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| 143 | * @param position The position direction in which the row should be stuck if that row should be
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| 144 | * sticky.
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| 145 | *
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| 146 | */
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| 147 | stickRows(rowsToStick, stickyStates, position) {
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| 148 | // Since we can't measure the rows on the server, we can't stick the rows properly.
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| 149 | if (!this._isBrowser) {
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| 150 | return;
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| 151 | }
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| 152 | // If positioning the rows to the bottom, reverse their order when evaluating the sticky
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| 153 | // position such that the last row stuck will be "bottom: 0px" and so on. Note that the
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| 154 | // sticky states need to be reversed as well.
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| 155 | const rows = position === 'bottom' ? rowsToStick.slice().reverse() : rowsToStick;
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| 156 | const states = position === 'bottom' ? stickyStates.slice().reverse() : stickyStates;
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| 157 | // Measure row heights all at once before adding sticky styles to reduce layout thrashing.
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| 158 | const stickyOffsets = [];
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| 159 | const stickyCellHeights = [];
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| 160 | const elementsToStick = [];
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| 161 | for (let rowIndex = 0, stickyOffset = 0; rowIndex < rows.length; rowIndex++) {
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| 162 | if (!states[rowIndex]) {
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| 163 | continue;
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| 164 | }
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| 165 | stickyOffsets[rowIndex] = stickyOffset;
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| 166 | const row = rows[rowIndex];
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| 167 | elementsToStick[rowIndex] = this._isNativeHtmlTable ?
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| 168 | Array.from(row.children) : [row];
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| 169 | const height = row.getBoundingClientRect().height;
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| 170 | stickyOffset += height;
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| 171 | stickyCellHeights[rowIndex] = height;
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| 172 | }
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| 173 | const borderedRowIndex = states.lastIndexOf(true);
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| 174 | // Coalesce with other sticky row updates (top/bottom), sticky columns updates
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| 175 | // (and potentially other changes like column resize).
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| 176 | this._coalescedStyleScheduler.schedule(() => {
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| 177 | var _a, _b;
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| 178 | for (let rowIndex = 0; rowIndex < rows.length; rowIndex++) {
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| 179 | if (!states[rowIndex]) {
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| 180 | continue;
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| 181 | }
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| 182 | const offset = stickyOffsets[rowIndex];
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| 183 | const isBorderedRowIndex = rowIndex === borderedRowIndex;
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| 184 | for (const element of elementsToStick[rowIndex]) {
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| 185 | this._addStickyStyle(element, position, offset, isBorderedRowIndex);
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| 186 | }
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| 187 | }
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| 188 | if (position === 'top') {
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| 189 | (_a = this._positionListener) === null || _a === void 0 ? void 0 : _a.stickyHeaderRowsUpdated({ sizes: stickyCellHeights, offsets: stickyOffsets, elements: elementsToStick });
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| 190 | }
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| 191 | else {
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| 192 | (_b = this._positionListener) === null || _b === void 0 ? void 0 : _b.stickyFooterRowsUpdated({ sizes: stickyCellHeights, offsets: stickyOffsets, elements: elementsToStick });
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| 193 | }
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| 194 | });
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| 195 | }
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| 196 | /**
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| 197 | * When using the native table in Safari, sticky footer cells do not stick. The only way to stick
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| 198 | * footer rows is to apply sticky styling to the tfoot container. This should only be done if
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| 199 | * all footer rows are sticky. If not all footer rows are sticky, remove sticky positioning from
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| 200 | * the tfoot element.
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| 201 | */
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| 202 | updateStickyFooterContainer(tableElement, stickyStates) {
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| 203 | if (!this._isNativeHtmlTable) {
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| 204 | return;
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| 205 | }
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| 206 | const tfoot = tableElement.querySelector('tfoot');
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| 207 | // Coalesce with other sticky updates (and potentially other changes like column resize).
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| 208 | this._coalescedStyleScheduler.schedule(() => {
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| 209 | if (stickyStates.some(state => !state)) {
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| 210 | this._removeStickyStyle(tfoot, ['bottom']);
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| 211 | }
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| 212 | else {
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| 213 | this._addStickyStyle(tfoot, 'bottom', 0, false);
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| 214 | }
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| 215 | });
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| 216 | }
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| 217 | /**
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| 218 | * Removes the sticky style on the element by removing the sticky cell CSS class, re-evaluating
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| 219 | * the zIndex, removing each of the provided sticky directions, and removing the
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| 220 | * sticky position if there are no more directions.
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| 221 | */
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| 222 | _removeStickyStyle(element, stickyDirections) {
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| 223 | for (const dir of stickyDirections) {
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| 224 | element.style[dir] = '';
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| 225 | element.classList.remove(this._borderCellCss[dir]);
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| 226 | }
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| 227 | // If the element no longer has any more sticky directions, remove sticky positioning and
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| 228 | // the sticky CSS class.
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| 229 | // Short-circuit checking element.style[dir] for stickyDirections as they
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| 230 | // were already removed above.
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| 231 | const hasDirection = STICKY_DIRECTIONS.some(dir => stickyDirections.indexOf(dir) === -1 && element.style[dir]);
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| 232 | if (hasDirection) {
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| 233 | element.style.zIndex = this._getCalculatedZIndex(element);
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| 234 | }
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| 235 | else {
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| 236 | // When not hasDirection, _getCalculatedZIndex will always return ''.
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| 237 | element.style.zIndex = '';
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| 238 | if (this._needsPositionStickyOnElement) {
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| 239 | element.style.position = '';
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| 240 | }
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| 241 | element.classList.remove(this._stickCellCss);
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| 242 | }
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| 243 | }
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| 244 | /**
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| 245 | * Adds the sticky styling to the element by adding the sticky style class, changing position
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| 246 | * to be sticky (and -webkit-sticky), setting the appropriate zIndex, and adding a sticky
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| 247 | * direction and value.
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| 248 | */
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| 249 | _addStickyStyle(element, dir, dirValue, isBorderElement) {
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| 250 | element.classList.add(this._stickCellCss);
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| 251 | if (isBorderElement) {
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| 252 | element.classList.add(this._borderCellCss[dir]);
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| 253 | }
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| 254 | element.style[dir] = `${dirValue}px`;
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| 255 | element.style.zIndex = this._getCalculatedZIndex(element);
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| 256 | if (this._needsPositionStickyOnElement) {
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| 257 | element.style.cssText += 'position: -webkit-sticky; position: sticky; ';
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| 258 | }
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| 259 | }
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| 260 | /**
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| 261 | * Calculate what the z-index should be for the element, depending on what directions (top,
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| 262 | * bottom, left, right) have been set. It should be true that elements with a top direction
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| 263 | * should have the highest index since these are elements like a table header. If any of those
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| 264 | * elements are also sticky in another direction, then they should appear above other elements
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| 265 | * that are only sticky top (e.g. a sticky column on a sticky header). Bottom-sticky elements
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| 266 | * (e.g. footer rows) should then be next in the ordering such that they are below the header
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| 267 | * but above any non-sticky elements. Finally, left/right sticky elements (e.g. sticky columns)
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| 268 | * should minimally increment so that they are above non-sticky elements but below top and bottom
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| 269 | * elements.
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| 270 | */
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| 271 | _getCalculatedZIndex(element) {
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| 272 | const zIndexIncrements = {
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| 273 | top: 100,
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| 274 | bottom: 10,
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| 275 | left: 1,
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| 276 | right: 1,
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| 277 | };
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| 278 | let zIndex = 0;
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| 279 | // Use `Iterable` instead of `Array` because TypeScript, as of 3.6.3,
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| 280 | // loses the array generic type in the `for of`. But we *also* have to use `Array` because
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| 281 | // typescript won't iterate over an `Iterable` unless you compile with `--downlevelIteration`
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| 282 | for (const dir of STICKY_DIRECTIONS) {
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| 283 | if (element.style[dir]) {
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| 284 | zIndex += zIndexIncrements[dir];
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| 285 | }
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| 286 | }
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| 287 | return zIndex ? `${zIndex}` : '';
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| 288 | }
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| 289 | /** Gets the widths for each cell in the provided row. */
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| 290 | _getCellWidths(row, recalculateCellWidths = true) {
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| 291 | if (!recalculateCellWidths && this._cachedCellWidths.length) {
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| 292 | return this._cachedCellWidths;
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| 293 | }
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| 294 | const cellWidths = [];
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| 295 | const firstRowCells = row.children;
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| 296 | for (let i = 0; i < firstRowCells.length; i++) {
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| 297 | let cell = firstRowCells[i];
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| 298 | cellWidths.push(cell.getBoundingClientRect().width);
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| 299 | }
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| 300 | this._cachedCellWidths = cellWidths;
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| 301 | return cellWidths;
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| 302 | }
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| 303 | /**
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| 304 | * Determines the left and right positions of each sticky column cell, which will be the
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| 305 | * accumulation of all sticky column cell widths to the left and right, respectively.
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| 306 | * Non-sticky cells do not need to have a value set since their positions will not be applied.
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| 307 | */
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| 308 | _getStickyStartColumnPositions(widths, stickyStates) {
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| 309 | const positions = [];
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| 310 | let nextPosition = 0;
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| 311 | for (let i = 0; i < widths.length; i++) {
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| 312 | if (stickyStates[i]) {
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| 313 | positions[i] = nextPosition;
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| 314 | nextPosition += widths[i];
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| 315 | }
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| 316 | }
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| 317 | return positions;
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| 318 | }
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| 319 | /**
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| 320 | * Determines the left and right positions of each sticky column cell, which will be the
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| 321 | * accumulation of all sticky column cell widths to the left and right, respectively.
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| 322 | * Non-sticky cells do not need to have a value set since their positions will not be applied.
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| 323 | */
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| 324 | _getStickyEndColumnPositions(widths, stickyStates) {
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| 325 | const positions = [];
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| 326 | let nextPosition = 0;
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| 327 | for (let i = widths.length; i > 0; i--) {
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| 328 | if (stickyStates[i]) {
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| 329 | positions[i] = nextPosition;
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| 330 | nextPosition += widths[i];
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| 331 | }
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| 332 | }
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| 333 | return positions;
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| 334 | }
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| 335 | }
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| 336 | //# 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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\n/**\n * Directions that can be used when setting sticky positioning.\n * @docs-private\n */\nimport {Direction} from '@angular/cdk/bidi';\nimport {_CoalescedStyleScheduler} from './coalesced-style-scheduler';\nimport {StickyPositioningListener} from './sticky-position-listener';\n\nexport type StickyDirection = 'top' | 'bottom' | 'left' | 'right';\n\n/**\n * List of all possible directions that can be used for sticky positioning.\n * @docs-private\n */\nexport const STICKY_DIRECTIONS: StickyDirection[] = ['top', 'bottom', 'left', 'right'];\n\n\n/**\n * Applies and removes sticky positioning styles to the `CdkTable` rows and columns cells.\n * @docs-private\n */\nexport class StickyStyler {\n  private _cachedCellWidths: number[] = [];\n  private readonly _borderCellCss: Readonly<{[d in StickyDirection]: string}>;\n\n  /**\n   * @param _isNativeHtmlTable Whether the sticky logic should be based on a table\n   *     that uses the native `<table>` element.\n   * @param _stickCellCss The CSS class that will be applied to every row/cell that has\n   *     sticky positioning applied.\n   * @param direction The directionality context of the table (ltr/rtl); affects column positioning\n   *     by reversing left/right positions.\n   * @param _isBrowser Whether the table is currently being rendered on the server or the client.\n   * @param _needsPositionStickyOnElement Whether we need to specify position: sticky on cells\n   *     using inline styles. If false, it is assumed that position: sticky is included in\n   *     the component stylesheet for _stickCellCss.\n   * @param _positionListener A listener that is notified of changes to sticky rows/columns\n   *     and their dimensions.\n   */\n  constructor(private _isNativeHtmlTable: boolean,\n              private _stickCellCss: string,\n              public direction: Direction,\n              private _coalescedStyleScheduler: _CoalescedStyleScheduler,\n              private _isBrowser = true,\n              private readonly _needsPositionStickyOnElement = true,\n              private readonly _positionListener?: StickyPositioningListener) {\n    this._borderCellCss = {\n      'top': `${_stickCellCss}-border-elem-top`,\n      'bottom': `${_stickCellCss}-border-elem-bottom`,\n      'left': `${_stickCellCss}-border-elem-left`,\n      'right': `${_stickCellCss}-border-elem-right`,\n    };\n  }\n\n  /**\n   * Clears the sticky positioning styles from the row and its cells by resetting the `position`\n   * style, setting the zIndex to 0, and unsetting each provided sticky direction.\n   * @param rows The list of rows that should be cleared from sticking in the provided directions\n   * @param stickyDirections The directions that should no longer be set as sticky on the rows.\n   */\n  clearStickyPositioning(rows: HTMLElement[], stickyDirections: StickyDirection[]) {\n    const elementsToClear: HTMLElement[] = [];\n    for (const row of rows) {\n      // If the row isn't an element (e.g. if it's an `ng-container`),\n      // it won't have inline styles or `children` so we skip it.\n      if (row.nodeType !== row.ELEMENT_NODE) {\n        continue;\n      }\n\n      elementsToClear.push(row);\n      for (let i = 0; i < row.children.length; i++) {\n        elementsToClear.push(row.children[i] as HTMLElement);\n      }\n    }\n\n    // Coalesce with sticky row/column updates (and potentially other changes like column resize).\n    this._coalescedStyleScheduler.schedule(() => {\n      for (const element of elementsToClear) {\n        this._removeStickyStyle(element, stickyDirections);\n      }\n    });\n  }\n\n  /**\n   * Applies sticky left and right positions to the cells of each row according to the sticky\n   * states of the rendered column definitions.\n   * @param rows The rows that should have its set of cells stuck according to the sticky states.\n   * @param stickyStartStates A list of boolean states where each state represents whether the cell\n   *     in this index position should be stuck to the start of the row.\n   * @param stickyEndStates A list of boolean states where each state represents whether the cell\n   *     in this index position should be stuck to the end of the row.\n   * @param recalculateCellWidths Whether the sticky styler should recalculate the width of each\n   *     column cell. If `false` cached widths will be used instead.\n   */\n  updateStickyColumns(\n      rows: HTMLElement[], stickyStartStates: boolean[], stickyEndStates: boolean[],\n      recalculateCellWidths = true) {\n    if (!rows.length || !this._isBrowser || !(stickyStartStates.some(state => state) ||\n        stickyEndStates.some(state => state))) {\n      if (this._positionListener) {\n        this._positionListener.stickyColumnsUpdated({sizes: []});\n        this._positionListener.stickyEndColumnsUpdated({sizes: []});\n      }\n\n      return;\n    }\n\n    const firstRow = rows[0];\n    const numCells = firstRow.children.length;\n    const cellWidths: number[] = this._getCellWidths(firstRow, recalculateCellWidths);\n\n    const startPositions = this._getStickyStartColumnPositions(cellWidths, stickyStartStates);\n    const endPositions = this._getStickyEndColumnPositions(cellWidths, stickyEndStates);\n\n    const lastStickyStart = stickyStartStates.lastIndexOf(true);\n    const firstStickyEnd = stickyEndStates.indexOf(true);\n\n    // Coalesce with sticky row updates (and potentially other changes like column resize).\n    this._coalescedStyleScheduler.schedule(() => {\n      const isRtl = this.direction === 'rtl';\n      const start = isRtl ? 'right' : 'left';\n      const end = isRtl ? 'left' : 'right';\n\n      for (const row of rows) {\n        for (let i = 0; i < numCells; i++) {\n          const cell = row.children[i] as HTMLElement;\n          if (stickyStartStates[i]) {\n            this._addStickyStyle(cell, start, startPositions[i], i === lastStickyStart);\n          }\n\n          if (stickyEndStates[i]) {\n            this._addStickyStyle(cell, end, endPositions[i], i === firstStickyEnd);\n          }\n        }\n      }\n\n      if (this._positionListener) {\n        this._positionListener.stickyColumnsUpdated({\n          sizes: lastStickyStart === -1 ?\n            [] :\n            cellWidths\n                .slice(0, lastStickyStart + 1)\n                .map((width, index) => stickyStartStates[index] ? width : null)\n        });\n        this._positionListener.stickyEndColumnsUpdated({\n          sizes: firstStickyEnd === -1 ?\n            [] :\n            cellWidths\n                .slice(firstStickyEnd)\n                .map((width, index) => stickyEndStates[index + firstStickyEnd] ? width : null)\n                .reverse()\n        });\n      }\n    });\n  }\n\n  /**\n   * Applies sticky positioning to the row's cells if using the native table layout, and to the\n   * row itself otherwise.\n   * @param rowsToStick The list of rows that should be stuck according to their corresponding\n   *     sticky state and to the provided top or bottom position.\n   * @param stickyStates A list of boolean states where each state represents whether the row\n   *     should be stuck in the particular top or bottom position.\n   * @param position The position direction in which the row should be stuck if that row should be\n   *     sticky.\n   *\n   */\n  stickRows(rowsToStick: HTMLElement[], stickyStates: boolean[], position: 'top' | 'bottom') {\n    // Since we can't measure the rows on the server, we can't stick the rows properly.\n    if (!this._isBrowser) {\n      return;\n    }\n\n    // If positioning the rows to the bottom, reverse their order when evaluating the sticky\n    // position such that the last row stuck will be \"bottom: 0px\" and so on. Note that the\n    // sticky states need to be reversed as well.\n    const rows = position === 'bottom' ? rowsToStick.slice().reverse() : rowsToStick;\n    const states = position === 'bottom' ? stickyStates.slice().reverse() : stickyStates;\n\n    // Measure row heights all at once before adding sticky styles to reduce layout thrashing.\n    const stickyOffsets: number[] = [];\n    const stickyCellHeights: (number|undefined)[] = [];\n    const elementsToStick: HTMLElement[][] = [];\n    for (let rowIndex = 0, stickyOffset = 0; rowIndex < rows.length; rowIndex++) {\n      if (!states[rowIndex]) {\n        continue;\n      }\n\n      stickyOffsets[rowIndex] = stickyOffset;\n      const row = rows[rowIndex];\n      elementsToStick[rowIndex] = this._isNativeHtmlTable ?\n          Array.from(row.children) as HTMLElement[] : [row];\n\n      const height = row.getBoundingClientRect().height;\n      stickyOffset += height;\n      stickyCellHeights[rowIndex] = height;\n    }\n\n    const borderedRowIndex = states.lastIndexOf(true);\n\n    // Coalesce with other sticky row updates (top/bottom), sticky columns updates\n    // (and potentially other changes like column resize).\n    this._coalescedStyleScheduler.schedule(() => {\n      for (let rowIndex = 0; rowIndex < rows.length; rowIndex++) {\n        if (!states[rowIndex]) {\n          continue;\n        }\n\n        const offset = stickyOffsets[rowIndex];\n        const isBorderedRowIndex = rowIndex === borderedRowIndex;\n        for (const element of elementsToStick[rowIndex]) {\n          this._addStickyStyle(element, position, offset, isBorderedRowIndex);\n        }\n      }\n\n      if (position === 'top') {\n        this._positionListener?.stickyHeaderRowsUpdated(\n            {sizes: stickyCellHeights, offsets: stickyOffsets, elements: elementsToStick});\n      } else {\n        this._positionListener?.stickyFooterRowsUpdated(\n            {sizes: stickyCellHeights, offsets: stickyOffsets, elements: elementsToStick});\n      }\n    });\n  }\n\n  /**\n   * When using the native table in Safari, sticky footer cells do not stick. The only way to stick\n   * footer rows is to apply sticky styling to the tfoot container. This should only be done if\n   * all footer rows are sticky. If not all footer rows are sticky, remove sticky positioning from\n   * the tfoot element.\n   */\n  updateStickyFooterContainer(tableElement: Element, stickyStates: boolean[]) {\n    if (!this._isNativeHtmlTable) {\n      return;\n    }\n\n    const tfoot = tableElement.querySelector('tfoot')!;\n\n    // Coalesce with other sticky updates (and potentially other changes like column resize).\n    this._coalescedStyleScheduler.schedule(() => {\n      if (stickyStates.some(state => !state)) {\n        this._removeStickyStyle(tfoot, ['bottom']);\n      } else {\n        this._addStickyStyle(tfoot, 'bottom', 0, false);\n      }\n    });\n  }\n\n  /**\n   * Removes the sticky style on the element by removing the sticky cell CSS class, re-evaluating\n   * the zIndex, removing each of the provided sticky directions, and removing the\n   * sticky position if there are no more directions.\n   */\n  _removeStickyStyle(element: HTMLElement, stickyDirections: StickyDirection[]) {\n    for (const dir of stickyDirections) {\n      element.style[dir] = '';\n      element.classList.remove(this._borderCellCss[dir]);\n    }\n\n    // If the element no longer has any more sticky directions, remove sticky positioning and\n    // the sticky CSS class.\n    // Short-circuit checking element.style[dir] for stickyDirections as they\n    // were already removed above.\n    const hasDirection = STICKY_DIRECTIONS.some(dir =>\n        stickyDirections.indexOf(dir) === -1 && element.style[dir]);\n    if (hasDirection) {\n      element.style.zIndex = this._getCalculatedZIndex(element);\n    } else {\n      // When not hasDirection, _getCalculatedZIndex will always return ''.\n      element.style.zIndex = '';\n      if (this._needsPositionStickyOnElement) {\n        element.style.position = '';\n      }\n      element.classList.remove(this._stickCellCss);\n    }\n  }\n\n  /**\n   * Adds the sticky styling to the element by adding the sticky style class, changing position\n   * to be sticky (and -webkit-sticky), setting the appropriate zIndex, and adding a sticky\n   * direction and value.\n   */\n  _addStickyStyle(element: HTMLElement, dir: StickyDirection, dirValue: number,\n      isBorderElement: boolean) {\n    element.classList.add(this._stickCellCss);\n    if (isBorderElement) {\n      element.classList.add(this._borderCellCss[dir]);\n    }\n    element.style[dir] = `${dirValue}px`;\n    element.style.zIndex = this._getCalculatedZIndex(element);\n    if (this._needsPositionStickyOnElement) {\n      element.style.cssText += 'position: -webkit-sticky; position: sticky; ';\n    }\n  }\n\n  /**\n   * Calculate what the z-index should be for the element, depending on what directions (top,\n   * bottom, left, right) have been set. It should be true that elements with a top direction\n   * should have the highest index since these are elements like a table header. If any of those\n   * elements are also sticky in another direction, then they should appear above other elements\n   * that are only sticky top (e.g. a sticky column on a sticky header). Bottom-sticky elements\n   * (e.g. footer rows) should then be next in the ordering such that they are below the header\n   * but above any non-sticky elements. Finally, left/right sticky elements (e.g. sticky columns)\n   * should minimally increment so that they are above non-sticky elements but below top and bottom\n   * elements.\n   */\n  _getCalculatedZIndex(element: HTMLElement): string {\n    const zIndexIncrements = {\n      top: 100,\n      bottom: 10,\n      left: 1,\n      right: 1,\n    };\n\n    let zIndex = 0;\n    // Use `Iterable` instead of `Array` because TypeScript, as of 3.6.3,\n    // loses the array generic type in the `for of`. But we *also* have to use `Array` because\n    // typescript won't iterate over an `Iterable` unless you compile with `--downlevelIteration`\n    for (const dir of STICKY_DIRECTIONS as Iterable<StickyDirection> & StickyDirection[]) {\n      if (element.style[dir]) {\n        zIndex += zIndexIncrements[dir];\n      }\n    }\n\n    return zIndex ? `${zIndex}` : '';\n  }\n\n  /** Gets the widths for each cell in the provided row. */\n  _getCellWidths(row: HTMLElement, recalculateCellWidths = true): number[] {\n    if (!recalculateCellWidths && this._cachedCellWidths.length) {\n      return this._cachedCellWidths;\n    }\n\n    const cellWidths: number[] = [];\n    const firstRowCells = row.children;\n    for (let i = 0; i < firstRowCells.length; i++) {\n      let cell: HTMLElement = firstRowCells[i] as HTMLElement;\n      cellWidths.push(cell.getBoundingClientRect().width);\n    }\n\n    this._cachedCellWidths = cellWidths;\n    return cellWidths;\n  }\n\n  /**\n   * Determines the left and right positions of each sticky column cell, which will be the\n   * accumulation of all sticky column cell widths to the left and right, respectively.\n   * Non-sticky cells do not need to have a value set since their positions will not be applied.\n   */\n  _getStickyStartColumnPositions(widths: number[], stickyStates: boolean[]): number[] {\n    const positions: number[] = [];\n    let nextPosition = 0;\n\n    for (let i = 0; i < widths.length; i++) {\n      if (stickyStates[i]) {\n        positions[i] = nextPosition;\n        nextPosition += widths[i];\n      }\n    }\n\n    return positions;\n  }\n\n  /**\n   * Determines the left and right positions of each sticky column cell, which will be the\n   * accumulation of all sticky column cell widths to the left and right, respectively.\n   * Non-sticky cells do not need to have a value set since their positions will not be applied.\n   */\n  _getStickyEndColumnPositions(widths: number[], stickyStates: boolean[]): number[] {\n    const positions: number[] = [];\n    let nextPosition = 0;\n\n    for (let i = widths.length; i > 0; i--) {\n      if (stickyStates[i]) {\n        positions[i] = nextPosition;\n        nextPosition += widths[i];\n      }\n    }\n\n    return positions;\n  }\n}\n"]} |
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