@almaobservatory/ngx-datatable
Version:
ngx-datatable is an Angular table grid component for presenting large and complex data.
138 lines • 16.8 kB
JavaScript
/**
* This object contains the cache of the various row heights that are present inside
* the data table. Its based on Fenwick tree data structure that helps with
* querying sums that have time complexity of log n.
*
* Fenwick Tree Credits: http://petr-mitrichev.blogspot.com/2013/05/fenwick-tree-range-updates.html
* https://github.com/mikolalysenko/fenwick-tree
*
*/
export class RowHeightCache {
constructor() {
/**
* Tree Array stores the cumulative information of the row heights to perform efficient
* range queries and updates. Currently the tree is initialized to the base row
* height instead of the detail row height.
*/
this.treeArray = [];
}
/**
* Clear the Tree array.
*/
clearCache() {
this.treeArray = [];
}
/**
* Initialize the Fenwick tree with row Heights.
*
* @param rows The array of rows which contain the expanded status.
* @param rowHeight The row height.
* @param detailRowHeight The detail row height.
*/
initCache(details) {
const { rows, rowHeight, detailRowHeight, externalVirtual, rowCount, rowIndexes, rowExpansions } = details;
const isFn = typeof rowHeight === 'function';
const isDetailFn = typeof detailRowHeight === 'function';
if (!isFn && isNaN(rowHeight)) {
throw new Error(`Row Height cache initialization failed. Please ensure that 'rowHeight' is a
valid number or function value: (${rowHeight}) when 'scrollbarV' is enabled.`);
}
// Add this additional guard in case detailRowHeight is set to 'auto' as it wont work.
if (!isDetailFn && isNaN(detailRowHeight)) {
throw new Error(`Row Height cache initialization failed. Please ensure that 'detailRowHeight' is a
valid number or function value: (${detailRowHeight}) when 'scrollbarV' is enabled.`);
}
const n = externalVirtual ? rowCount : rows.length;
this.treeArray = new Array(n);
for (let i = 0; i < n; ++i) {
this.treeArray[i] = 0;
}
for (let i = 0; i < n; ++i) {
const row = rows[i];
let currentRowHeight = rowHeight;
if (isFn) {
currentRowHeight = rowHeight(row);
}
// Add the detail row height to the already expanded rows.
// This is useful for the table that goes through a filter or sort.
const expanded = rowExpansions.has(row);
if (row && expanded) {
if (isDetailFn) {
const index = rowIndexes.get(row);
currentRowHeight += detailRowHeight(row, index);
}
else {
currentRowHeight += detailRowHeight;
}
}
this.update(i, currentRowHeight);
}
}
/**
* Given the ScrollY position i.e. sum, provide the rowIndex
* that is present in the current view port. Below handles edge cases.
*/
getRowIndex(scrollY) {
if (scrollY === 0)
return 0;
return this.calcRowIndex(scrollY);
}
/**
* When a row is expanded or rowHeight is changed, update the height. This can
* be utilized in future when Angular Data table supports dynamic row heights.
*/
update(atRowIndex, byRowHeight) {
if (!this.treeArray.length) {
throw new Error(`Update at index ${atRowIndex} with value ${byRowHeight} failed:
Row Height cache not initialized.`);
}
const n = this.treeArray.length;
atRowIndex |= 0;
while (atRowIndex < n) {
this.treeArray[atRowIndex] += byRowHeight;
atRowIndex |= atRowIndex + 1;
}
}
/**
* Range Sum query from 1 to the rowIndex
*/
query(atIndex) {
if (!this.treeArray.length) {
throw new Error(`query at index ${atIndex} failed: Fenwick tree array not initialized.`);
}
let sum = 0;
atIndex |= 0;
while (atIndex >= 0) {
sum += this.treeArray[atIndex];
atIndex = (atIndex & (atIndex + 1)) - 1;
}
return sum;
}
/**
* Find the total height between 2 row indexes
*/
queryBetween(atIndexA, atIndexB) {
return this.query(atIndexB) - this.query(atIndexA - 1);
}
/**
* Given the ScrollY position i.e. sum, provide the rowIndex
* that is present in the current view port.
*/
calcRowIndex(sum) {
if (!this.treeArray.length)
return 0;
let pos = -1;
const dataLength = this.treeArray.length;
// Get the highest bit for the block size.
const highestBit = Math.pow(2, dataLength.toString(2).length - 1);
for (let blockSize = highestBit; blockSize !== 0; blockSize >>= 1) {
const nextPos = pos + blockSize;
if (nextPos < dataLength && sum >= this.treeArray[nextPos]) {
sum -= this.treeArray[nextPos];
pos = nextPos;
}
}
return pos + 1;
}
}
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Its based on Fenwick tree data structure that helps with\r\n * querying sums that have time complexity of log n.\r\n *\r\n * Fenwick Tree Credits: http://petr-mitrichev.blogspot.com/2013/05/fenwick-tree-range-updates.html\r\n * https://github.com/mikolalysenko/fenwick-tree\r\n *\r\n */\r\nexport class RowHeightCache {\r\n  /**\r\n   * Tree Array stores the cumulative information of the row heights to perform efficient\r\n   * range queries and updates.  Currently the tree is initialized to the base row\r\n   * height instead of the detail row height.\r\n   */\r\n  private treeArray: number[] = [];\r\n\r\n  /**\r\n   * Clear the Tree array.\r\n   */\r\n  clearCache(): void {\r\n    this.treeArray = [];\r\n  }\r\n\r\n  /**\r\n   * Initialize the Fenwick tree with row Heights.\r\n   *\r\n   * @param rows The array of rows which contain the expanded status.\r\n   * @param rowHeight The row height.\r\n   * @param detailRowHeight The detail row height.\r\n   */\r\n  initCache(details: any): void {\r\n    const { rows, rowHeight, detailRowHeight, externalVirtual, rowCount, rowIndexes, rowExpansions } = details;\r\n    const isFn = typeof rowHeight === 'function';\r\n    const isDetailFn = typeof detailRowHeight === 'function';\r\n\r\n    if (!isFn && isNaN(rowHeight)) {\r\n      throw new Error(`Row Height cache initialization failed. Please ensure that 'rowHeight' is a\r\n        valid number or function value: (${rowHeight}) when 'scrollbarV' is enabled.`);\r\n    }\r\n\r\n    // Add this additional guard in case detailRowHeight is set to 'auto' as it wont work.\r\n    if (!isDetailFn && isNaN(detailRowHeight)) {\r\n      throw new Error(`Row Height cache initialization failed. Please ensure that 'detailRowHeight' is a\r\n        valid number or function value: (${detailRowHeight}) when 'scrollbarV' is enabled.`);\r\n    }\r\n\r\n    const n = externalVirtual ? rowCount : rows.length;\r\n    this.treeArray = new Array(n);\r\n\r\n    for (let i = 0; i < n; ++i) {\r\n      this.treeArray[i] = 0;\r\n    }\r\n\r\n    for (let i = 0; i < n; ++i) {\r\n      const row = rows[i];\r\n      let currentRowHeight = rowHeight;\r\n      if (isFn) {\r\n        currentRowHeight = rowHeight(row);\r\n      }\r\n\r\n      // Add the detail row height to the already expanded rows.\r\n      // This is useful for the table that goes through a filter or sort.\r\n      const expanded = rowExpansions.has(row);\r\n      if (row && expanded) {\r\n        if (isDetailFn) {\r\n          const index = rowIndexes.get(row);\r\n          currentRowHeight += detailRowHeight(row, index);\r\n        } else {\r\n          currentRowHeight += detailRowHeight;\r\n        }\r\n      }\r\n\r\n      this.update(i, currentRowHeight);\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Given the ScrollY position i.e. sum, provide the rowIndex\r\n   * that is present in the current view port.  Below handles edge cases.\r\n   */\r\n  getRowIndex(scrollY: number): number {\r\n    if (scrollY === 0) return 0;\r\n    return this.calcRowIndex(scrollY);\r\n  }\r\n\r\n  /**\r\n   * When a row is expanded or rowHeight is changed, update the height.  This can\r\n   * be utilized in future when Angular Data table supports dynamic row heights.\r\n   */\r\n  update(atRowIndex: number, byRowHeight: number): void {\r\n    if (!this.treeArray.length) {\r\n      throw new Error(`Update at index ${atRowIndex} with value ${byRowHeight} failed:\r\n        Row Height cache not initialized.`);\r\n    }\r\n\r\n    const n = this.treeArray.length;\r\n    atRowIndex |= 0;\r\n\r\n    while (atRowIndex < n) {\r\n      this.treeArray[atRowIndex] += byRowHeight;\r\n      atRowIndex |= atRowIndex + 1;\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Range Sum query from 1 to the rowIndex\r\n   */\r\n  query(atIndex: number): number {\r\n    if (!this.treeArray.length) {\r\n      throw new Error(`query at index ${atIndex} failed: Fenwick tree array not initialized.`);\r\n    }\r\n\r\n    let sum = 0;\r\n    atIndex |= 0;\r\n\r\n    while (atIndex >= 0) {\r\n      sum += this.treeArray[atIndex];\r\n      atIndex = (atIndex & (atIndex + 1)) - 1;\r\n    }\r\n\r\n    return sum;\r\n  }\r\n\r\n  /**\r\n   * Find the total height between 2 row indexes\r\n   */\r\n  queryBetween(atIndexA: number, atIndexB: number): number {\r\n    return this.query(atIndexB) - this.query(atIndexA - 1);\r\n  }\r\n\r\n  /**\r\n   * Given the ScrollY position i.e. sum, provide the rowIndex\r\n   * that is present in the current view port.\r\n   */\r\n  private calcRowIndex(sum: number): number {\r\n    if (!this.treeArray.length) return 0;\r\n\r\n    let pos = -1;\r\n    const dataLength = this.treeArray.length;\r\n\r\n    // Get the highest bit for the block size.\r\n    const highestBit = Math.pow(2, dataLength.toString(2).length - 1);\r\n\r\n    for (let blockSize = highestBit; blockSize !== 0; blockSize >>= 1) {\r\n      const nextPos = pos + blockSize;\r\n      if (nextPos < dataLength && sum >= this.treeArray[nextPos]) {\r\n        sum -= this.treeArray[nextPos];\r\n        pos = nextPos;\r\n      }\r\n    }\r\n\r\n    return pos + 1;\r\n  }\r\n}\r\n"]}