@angular/material
Version:
Angular Material
145 lines • 19.6 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
/**
* Class for determining, from a list of tiles, the (row, col) position of each of those tiles
* in the grid. This is necessary (rather than just rendering the tiles in normal document flow)
* because the tiles can have a rowspan.
*
* The positioning algorithm greedily places each tile as soon as it encounters a gap in the grid
* large enough to accommodate it so that the tiles still render in the same order in which they
* are given.
*
* The basis of the algorithm is the use of an array to track the already placed tiles. Each
* element of the array corresponds to a column, and the value indicates how many cells in that
* column are already occupied; zero indicates an empty cell. Moving "down" to the next row
* decrements each value in the tracking array (indicating that the column is one cell closer to
* being free).
*
* @docs-private
*/
export class TileCoordinator {
constructor() {
/** Index at which the search for the next gap will start. */
this.columnIndex = 0;
/** The current row index. */
this.rowIndex = 0;
}
/** Gets the total number of rows occupied by tiles */
get rowCount() {
return this.rowIndex + 1;
}
/**
* Gets the total span of rows occupied by tiles.
* Ex: A list with 1 row that contains a tile with rowspan 2 will have a total rowspan of 2.
*/
get rowspan() {
const lastRowMax = Math.max(...this.tracker);
// if any of the tiles has a rowspan that pushes it beyond the total row count,
// add the difference to the rowcount
return lastRowMax > 1 ? this.rowCount + lastRowMax - 1 : this.rowCount;
}
/**
* Updates the tile positions.
* @param numColumns Amount of columns in the grid.
* @param tiles Tiles to be positioned.
*/
update(numColumns, tiles) {
this.columnIndex = 0;
this.rowIndex = 0;
this.tracker = new Array(numColumns);
this.tracker.fill(0, 0, this.tracker.length);
this.positions = tiles.map(tile => this._trackTile(tile));
}
/** Calculates the row and col position of a tile. */
_trackTile(tile) {
// Find a gap large enough for this tile.
const gapStartIndex = this._findMatchingGap(tile.colspan);
// Place tile in the resulting gap.
this._markTilePosition(gapStartIndex, tile);
// The next time we look for a gap, the search will start at columnIndex, which should be
// immediately after the tile that has just been placed.
this.columnIndex = gapStartIndex + tile.colspan;
return new TilePosition(this.rowIndex, gapStartIndex);
}
/** Finds the next available space large enough to fit the tile. */
_findMatchingGap(tileCols) {
if (tileCols > this.tracker.length && (typeof ngDevMode === 'undefined' || ngDevMode)) {
throw Error(`mat-grid-list: tile with colspan ${tileCols} is wider than ` +
`grid with cols="${this.tracker.length}".`);
}
// Start index is inclusive, end index is exclusive.
let gapStartIndex = -1;
let gapEndIndex = -1;
// Look for a gap large enough to fit the given tile. Empty spaces are marked with a zero.
do {
// If we've reached the end of the row, go to the next row.
if (this.columnIndex + tileCols > this.tracker.length) {
this._nextRow();
gapStartIndex = this.tracker.indexOf(0, this.columnIndex);
gapEndIndex = this._findGapEndIndex(gapStartIndex);
continue;
}
gapStartIndex = this.tracker.indexOf(0, this.columnIndex);
// If there are no more empty spaces in this row at all, move on to the next row.
if (gapStartIndex == -1) {
this._nextRow();
gapStartIndex = this.tracker.indexOf(0, this.columnIndex);
gapEndIndex = this._findGapEndIndex(gapStartIndex);
continue;
}
gapEndIndex = this._findGapEndIndex(gapStartIndex);
// If a gap large enough isn't found, we want to start looking immediately after the current
// gap on the next iteration.
this.columnIndex = gapStartIndex + 1;
// Continue iterating until we find a gap wide enough for this tile. Since gapEndIndex is
// exclusive, gapEndIndex is 0 means we didn't find a gap and should continue.
} while (gapEndIndex - gapStartIndex < tileCols || gapEndIndex == 0);
// If we still didn't manage to find a gap, ensure that the index is
// at least zero so the tile doesn't get pulled out of the grid.
return Math.max(gapStartIndex, 0);
}
/** Move "down" to the next row. */
_nextRow() {
this.columnIndex = 0;
this.rowIndex++;
// Decrement all spaces by one to reflect moving down one row.
for (let i = 0; i < this.tracker.length; i++) {
this.tracker[i] = Math.max(0, this.tracker[i] - 1);
}
}
/**
* Finds the end index (exclusive) of a gap given the index from which to start looking.
* The gap ends when a non-zero value is found.
*/
_findGapEndIndex(gapStartIndex) {
for (let i = gapStartIndex + 1; i < this.tracker.length; i++) {
if (this.tracker[i] != 0) {
return i;
}
}
// The gap ends with the end of the row.
return this.tracker.length;
}
/** Update the tile tracker to account for the given tile in the given space. */
_markTilePosition(start, tile) {
for (let i = 0; i < tile.colspan; i++) {
this.tracker[start + i] = tile.rowspan;
}
}
}
/**
* Simple data structure for tile position (row, col).
* @docs-private
*/
export class TilePosition {
constructor(row, col) {
this.row = row;
this.col = col;
}
}
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This is necessary (rather than just rendering the tiles in normal document flow)\n * because the tiles can have a rowspan.\n *\n * The positioning algorithm greedily places each tile as soon as it encounters a gap in the grid\n * large enough to accommodate it so that the tiles still render in the same order in which they\n * are given.\n *\n * The basis of the algorithm is the use of an array to track the already placed tiles. Each\n * element of the array corresponds to a column, and the value indicates how many cells in that\n * column are already occupied; zero indicates an empty cell. Moving \"down\" to the next row\n * decrements each value in the tracking array (indicating that the column is one cell closer to\n * being free).\n *\n * @docs-private\n */\nexport class TileCoordinator {\n  /** Tracking array (see class description). */\n  tracker: number[];\n\n  /** Index at which the search for the next gap will start. */\n  columnIndex: number = 0;\n\n  /** The current row index. */\n  rowIndex: number = 0;\n\n  /** Gets the total number of rows occupied by tiles */\n  get rowCount(): number {\n    return this.rowIndex + 1;\n  }\n\n  /**\n   * Gets the total span of rows occupied by tiles.\n   * Ex: A list with 1 row that contains a tile with rowspan 2 will have a total rowspan of 2.\n   */\n  get rowspan() {\n    const lastRowMax = Math.max(...this.tracker);\n    // if any of the tiles has a rowspan that pushes it beyond the total row count,\n    // add the difference to the rowcount\n    return lastRowMax > 1 ? this.rowCount + lastRowMax - 1 : this.rowCount;\n  }\n\n  /** The computed (row, col) position of each tile (the output). */\n  positions: TilePosition[];\n\n  /**\n   * Updates the tile positions.\n   * @param numColumns Amount of columns in the grid.\n   * @param tiles Tiles to be positioned.\n   */\n  update(numColumns: number, tiles: Tile[]) {\n    this.columnIndex = 0;\n    this.rowIndex = 0;\n\n    this.tracker = new Array(numColumns);\n    this.tracker.fill(0, 0, this.tracker.length);\n    this.positions = tiles.map(tile => this._trackTile(tile));\n  }\n\n  /** Calculates the row and col position of a tile. */\n  private _trackTile(tile: Tile): TilePosition {\n    // Find a gap large enough for this tile.\n    const gapStartIndex = this._findMatchingGap(tile.colspan);\n\n    // Place tile in the resulting gap.\n    this._markTilePosition(gapStartIndex, tile);\n\n    // The next time we look for a gap, the search will start at columnIndex, which should be\n    // immediately after the tile that has just been placed.\n    this.columnIndex = gapStartIndex + tile.colspan;\n\n    return new TilePosition(this.rowIndex, gapStartIndex);\n  }\n\n  /** Finds the next available space large enough to fit the tile. */\n  private _findMatchingGap(tileCols: number): number {\n    if (tileCols > this.tracker.length && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error(\n        `mat-grid-list: tile with colspan ${tileCols} is wider than ` +\n          `grid with cols=\"${this.tracker.length}\".`,\n      );\n    }\n\n    // Start index is inclusive, end index is exclusive.\n    let gapStartIndex = -1;\n    let gapEndIndex = -1;\n\n    // Look for a gap large enough to fit the given tile. Empty spaces are marked with a zero.\n    do {\n      // If we've reached the end of the row, go to the next row.\n      if (this.columnIndex + tileCols > this.tracker.length) {\n        this._nextRow();\n        gapStartIndex = this.tracker.indexOf(0, this.columnIndex);\n        gapEndIndex = this._findGapEndIndex(gapStartIndex);\n        continue;\n      }\n\n      gapStartIndex = this.tracker.indexOf(0, this.columnIndex);\n\n      // If there are no more empty spaces in this row at all, move on to the next row.\n      if (gapStartIndex == -1) {\n        this._nextRow();\n        gapStartIndex = this.tracker.indexOf(0, this.columnIndex);\n        gapEndIndex = this._findGapEndIndex(gapStartIndex);\n        continue;\n      }\n\n      gapEndIndex = this._findGapEndIndex(gapStartIndex);\n\n      // If a gap large enough isn't found, we want to start looking immediately after the current\n      // gap on the next iteration.\n      this.columnIndex = gapStartIndex + 1;\n\n      // Continue iterating until we find a gap wide enough for this tile. Since gapEndIndex is\n      // exclusive, gapEndIndex is 0 means we didn't find a gap and should continue.\n    } while (gapEndIndex - gapStartIndex < tileCols || gapEndIndex == 0);\n\n    // If we still didn't manage to find a gap, ensure that the index is\n    // at least zero so the tile doesn't get pulled out of the grid.\n    return Math.max(gapStartIndex, 0);\n  }\n\n  /** Move \"down\" to the next row. */\n  private _nextRow(): void {\n    this.columnIndex = 0;\n    this.rowIndex++;\n\n    // Decrement all spaces by one to reflect moving down one row.\n    for (let i = 0; i < this.tracker.length; i++) {\n      this.tracker[i] = Math.max(0, this.tracker[i] - 1);\n    }\n  }\n\n  /**\n   * Finds the end index (exclusive) of a gap given the index from which to start looking.\n   * The gap ends when a non-zero value is found.\n   */\n  private _findGapEndIndex(gapStartIndex: number): number {\n    for (let i = gapStartIndex + 1; i < this.tracker.length; i++) {\n      if (this.tracker[i] != 0) {\n        return i;\n      }\n    }\n\n    // The gap ends with the end of the row.\n    return this.tracker.length;\n  }\n\n  /** Update the tile tracker to account for the given tile in the given space. */\n  private _markTilePosition(start: number, tile: Tile): void {\n    for (let i = 0; i < tile.colspan; i++) {\n      this.tracker[start + i] = tile.rowspan;\n    }\n  }\n}\n\n/**\n * Simple data structure for tile position (row, col).\n * @docs-private\n */\nexport class TilePosition {\n  constructor(public row: number, public col: number) {}\n}\n"]}