Method _getAllRenderRows

src/cdk/table/table.ts:1048–1086

* Get the list of RenderRow objects to render according to the current list of data and defined * row definitions. If the previous list already contained a particular pair, it should be reused * so that the differ equates their references.

()

   * so that the differ equates their references.
   */
  private _getAllRenderRows(): RenderRow<T>[] {
    // Note: the `_data` is typed as an array, but some internal apps end up passing diffrent types.
    if (!Array.isArray(this._data) || !this._renderedRange) {
      return [];
    }

    const renderRows: RenderRow<T>[] = [];
    const end = Math.min(this._data.length, this._renderedRange.end);

    // Store the cache and create a new one. Any re-used RenderRow objects will be moved into the
    // new cache while unused ones can be picked up by garbage collection.
    const prevCachedRenderRows = this._cachedRenderRowsMap;
    this._cachedRenderRowsMap = new Map();

    // For each data object, get the list of rows that should be rendered, represented by the
    // respective `RenderRow` object which is the pair of `data` and `CdkRowDef`.
    for (let i = this._renderedRange.start; i < end; i++) {
      const data = this._data[i];
      const renderRowsForData = this._getRenderRowsForData(data, i, prevCachedRenderRows.get(data));

      if (!this._cachedRenderRowsMap.has(data)) {
        this._cachedRenderRowsMap.set(data, new WeakMap());
      }

      for (let j = 0; j < renderRowsForData.length; j++) {
        let renderRow = renderRowsForData[j];

        const cache = this._cachedRenderRowsMap.get(renderRow.data)!;
        if (cache.has(renderRow.rowDef)) {
          cache.get(renderRow.rowDef)!.push(renderRow);
        } else {
          cache.set(renderRow.rowDef, [renderRow]);
        }
        renderRows.push(renderRow);
      }
    }

    return renderRows;
  }

  /**
   * Gets a list of `RenderRow<T>` for the provided data object and any `CdkRowDef` objects that