@angular/cdk
Version:
Angular Material Component Development Kit
301 lines • 41.9 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
*/
/**
* List of all possible directions that can be used for sticky positioning.
* @docs-private
*/
export const STICKY_DIRECTIONS = ['top', 'bottom', 'left', 'right'];
/**
* Applies and removes sticky positioning styles to the `CdkTable` rows and columns cells.
* @docs-private
*/
export class StickyStyler {
/**
* @param _isNativeHtmlTable Whether the sticky logic should be based on a table
* that uses the native `<table>` element.
* @param _stickCellCss The CSS class that will be applied to every row/cell that has
* sticky positioning applied.
* @param direction The directionality context of the table (ltr/rtl); affects column positioning
* by reversing left/right positions.
* @param _isBrowser Whether the table is currently being rendered on the server or the client.
* @param _needsPositionStickyOnElement Whether we need to specify position: sticky on cells
* using inline styles. If false, it is assumed that position: sticky is included in
* the component stylesheet for _stickCellCss.
*/
constructor(_isNativeHtmlTable, _stickCellCss, direction,
/**
* @deprecated `_coalescedStyleScheduler` parameter to become required.
* @breaking-change 11.0.0
*/
_coalescedStyleScheduler, _isBrowser = true, _needsPositionStickyOnElement = true) {
this._isNativeHtmlTable = _isNativeHtmlTable;
this._stickCellCss = _stickCellCss;
this.direction = direction;
this._coalescedStyleScheduler = _coalescedStyleScheduler;
this._isBrowser = _isBrowser;
this._needsPositionStickyOnElement = _needsPositionStickyOnElement;
}
/**
* Clears the sticky positioning styles from the row and its cells by resetting the `position`
* style, setting the zIndex to 0, and unsetting each provided sticky direction.
* @param rows The list of rows that should be cleared from sticking in the provided directions
* @param stickyDirections The directions that should no longer be set as sticky on the rows.
*/
clearStickyPositioning(rows, stickyDirections) {
const elementsToClear = [];
for (const row of rows) {
// If the row isn't an element (e.g. if it's an `ng-container`),
// it won't have inline styles or `children` so we skip it.
if (row.nodeType !== row.ELEMENT_NODE) {
continue;
}
elementsToClear.push(row);
for (let i = 0; i < row.children.length; i++) {
elementsToClear.push(row.children[i]);
}
}
// Coalesce with sticky row/column updates (and potentially other changes like column resize).
this._scheduleStyleChanges(() => {
for (const element of elementsToClear) {
this._removeStickyStyle(element, stickyDirections);
}
});
}
/**
* Applies sticky left and right positions to the cells of each row according to the sticky
* states of the rendered column definitions.
* @param rows The rows that should have its set of cells stuck according to the sticky states.
* @param stickyStartStates A list of boolean states where each state represents whether the cell
* in this index position should be stuck to the start of the row.
* @param stickyEndStates A list of boolean states where each state represents whether the cell
* in this index position should be stuck to the end of the row.
*/
updateStickyColumns(rows, stickyStartStates, stickyEndStates) {
if (!rows.length || !this._isBrowser || !(stickyStartStates.some(state => state) ||
stickyEndStates.some(state => state))) {
return;
}
const firstRow = rows[0];
const numCells = firstRow.children.length;
const cellWidths = this._getCellWidths(firstRow);
const startPositions = this._getStickyStartColumnPositions(cellWidths, stickyStartStates);
const endPositions = this._getStickyEndColumnPositions(cellWidths, stickyEndStates);
// Coalesce with sticky row updates (and potentially other changes like column resize).
this._scheduleStyleChanges(() => {
const isRtl = this.direction === 'rtl';
const start = isRtl ? 'right' : 'left';
const end = isRtl ? 'left' : 'right';
for (const row of rows) {
for (let i = 0; i < numCells; i++) {
const cell = row.children[i];
if (stickyStartStates[i]) {
this._addStickyStyle(cell, start, startPositions[i]);
}
if (stickyEndStates[i]) {
this._addStickyStyle(cell, end, endPositions[i]);
}
}
}
});
}
/**
* Applies sticky positioning to the row's cells if using the native table layout, and to the
* row itself otherwise.
* @param rowsToStick The list of rows that should be stuck according to their corresponding
* sticky state and to the provided top or bottom position.
* @param stickyStates A list of boolean states where each state represents whether the row
* should be stuck in the particular top or bottom position.
* @param position The position direction in which the row should be stuck if that row should be
* sticky.
*
*/
stickRows(rowsToStick, stickyStates, position) {
// Since we can't measure the rows on the server, we can't stick the rows properly.
if (!this._isBrowser) {
return;
}
// If positioning the rows to the bottom, reverse their order when evaluating the sticky
// position such that the last row stuck will be "bottom: 0px" and so on. Note that the
// sticky states need to be reversed as well.
const rows = position === 'bottom' ? rowsToStick.slice().reverse() : rowsToStick;
const states = position === 'bottom' ? stickyStates.slice().reverse() : stickyStates;
// Measure row heights all at once before adding sticky styles to reduce layout thrashing.
const stickyHeights = [];
const elementsToStick = [];
for (let rowIndex = 0, stickyHeight = 0; rowIndex < rows.length; rowIndex++) {
stickyHeights[rowIndex] = stickyHeight;
if (!states[rowIndex]) {
continue;
}
const row = rows[rowIndex];
elementsToStick[rowIndex] = this._isNativeHtmlTable ?
Array.from(row.children) : [row];
if (rowIndex !== rows.length - 1) {
stickyHeight += row.getBoundingClientRect().height;
}
}
// Coalesce with other sticky row updates (top/bottom), sticky columns updates
// (and potentially other changes like column resize).
this._scheduleStyleChanges(() => {
for (let rowIndex = 0; rowIndex < rows.length; rowIndex++) {
if (!states[rowIndex]) {
continue;
}
const height = stickyHeights[rowIndex];
for (const element of elementsToStick[rowIndex]) {
this._addStickyStyle(element, position, height);
}
}
});
}
/**
* When using the native table in Safari, sticky footer cells do not stick. The only way to stick
* footer rows is to apply sticky styling to the tfoot container. This should only be done if
* all footer rows are sticky. If not all footer rows are sticky, remove sticky positioning from
* the tfoot element.
*/
updateStickyFooterContainer(tableElement, stickyStates) {
if (!this._isNativeHtmlTable) {
return;
}
const tfoot = tableElement.querySelector('tfoot');
// Coalesce with other sticky updates (and potentially other changes like column resize).
this._scheduleStyleChanges(() => {
if (stickyStates.some(state => !state)) {
this._removeStickyStyle(tfoot, ['bottom']);
}
else {
this._addStickyStyle(tfoot, 'bottom', 0);
}
});
}
/**
* Removes the sticky style on the element by removing the sticky cell CSS class, re-evaluating
* the zIndex, removing each of the provided sticky directions, and removing the
* sticky position if there are no more directions.
*/
_removeStickyStyle(element, stickyDirections) {
for (const dir of stickyDirections) {
element.style[dir] = '';
}
// If the element no longer has any more sticky directions, remove sticky positioning and
// the sticky CSS class.
// Short-circuit checking element.style[dir] for stickyDirections as they
// were already removed above.
const hasDirection = STICKY_DIRECTIONS.some(dir => stickyDirections.indexOf(dir) === -1 && element.style[dir]);
if (hasDirection) {
element.style.zIndex = this._getCalculatedZIndex(element);
}
else {
// When not hasDirection, _getCalculatedZIndex will always return ''.
element.style.zIndex = '';
if (this._needsPositionStickyOnElement) {
element.style.position = '';
}
element.classList.remove(this._stickCellCss);
}
}
/**
* Adds the sticky styling to the element by adding the sticky style class, changing position
* to be sticky (and -webkit-sticky), setting the appropriate zIndex, and adding a sticky
* direction and value.
*/
_addStickyStyle(element, dir, dirValue) {
element.classList.add(this._stickCellCss);
element.style[dir] = `${dirValue}px`;
element.style.zIndex = this._getCalculatedZIndex(element);
if (this._needsPositionStickyOnElement) {
element.style.cssText += 'position: -webkit-sticky; position: sticky; ';
}
}
/**
* Calculate what the z-index should be for the element, depending on what directions (top,
* bottom, left, right) have been set. It should be true that elements with a top direction
* should have the highest index since these are elements like a table header. If any of those
* elements are also sticky in another direction, then they should appear above other elements
* that are only sticky top (e.g. a sticky column on a sticky header). Bottom-sticky elements
* (e.g. footer rows) should then be next in the ordering such that they are below the header
* but above any non-sticky elements. Finally, left/right sticky elements (e.g. sticky columns)
* should minimally increment so that they are above non-sticky elements but below top and bottom
* elements.
*/
_getCalculatedZIndex(element) {
const zIndexIncrements = {
top: 100,
bottom: 10,
left: 1,
right: 1,
};
let zIndex = 0;
// Use `Iterable` instead of `Array` because TypeScript, as of 3.6.3,
// loses the array generic type in the `for of`. But we *also* have to use `Array` because
// typescript won't iterate over an `Iterable` unless you compile with `--downlevelIteration`
for (const dir of STICKY_DIRECTIONS) {
if (element.style[dir]) {
zIndex += zIndexIncrements[dir];
}
}
return zIndex ? `${zIndex}` : '';
}
/** Gets the widths for each cell in the provided row. */
_getCellWidths(row) {
const cellWidths = [];
const firstRowCells = row.children;
for (let i = 0; i < firstRowCells.length; i++) {
let cell = firstRowCells[i];
cellWidths.push(cell.getBoundingClientRect().width);
}
return cellWidths;
}
/**
* Determines the left and right positions of each sticky column cell, which will be the
* accumulation of all sticky column cell widths to the left and right, respectively.
* Non-sticky cells do not need to have a value set since their positions will not be applied.
*/
_getStickyStartColumnPositions(widths, stickyStates) {
const positions = [];
let nextPosition = 0;
for (let i = 0; i < widths.length; i++) {
if (stickyStates[i]) {
positions[i] = nextPosition;
nextPosition += widths[i];
}
}
return positions;
}
/**
* Determines the left and right positions of each sticky column cell, which will be the
* accumulation of all sticky column cell widths to the left and right, respectively.
* Non-sticky cells do not need to have a value set since their positions will not be applied.
*/
_getStickyEndColumnPositions(widths, stickyStates) {
const positions = [];
let nextPosition = 0;
for (let i = widths.length; i > 0; i--) {
if (stickyStates[i]) {
positions[i] = nextPosition;
nextPosition += widths[i];
}
}
return positions;
}
/**
* Schedules styles to be applied when the style scheduler deems appropriate.
* @breaking-change 11.0.0 This method can be removed in favor of calling
* `CoalescedStyleScheduler.schedule` directly once the scheduler is a required parameter.
*/
_scheduleStyleChanges(changes) {
if (this._coalescedStyleScheduler) {
this._coalescedStyleScheduler.schedule(changes);
}
else {
changes();
}
}
}
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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';\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  /**\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   */\n  constructor(private _isNativeHtmlTable: boolean,\n              private _stickCellCss: string,\n              public direction: Direction,\n              /**\n               * @deprecated `_coalescedStyleScheduler` parameter to become required.\n               * @breaking-change 11.0.0\n               */\n              private _coalescedStyleScheduler?: _CoalescedStyleScheduler,\n              private _isBrowser = true,\n              private readonly _needsPositionStickyOnElement = true) { }\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._scheduleStyleChanges(() => {\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   */\n  updateStickyColumns(\n      rows: HTMLElement[], stickyStartStates: boolean[], stickyEndStates: boolean[]) {\n    if (!rows.length || !this._isBrowser || !(stickyStartStates.some(state => state) ||\n        stickyEndStates.some(state => state))) {\n      return;\n    }\n\n    const firstRow = rows[0];\n    const numCells = firstRow.children.length;\n    const cellWidths: number[] = this._getCellWidths(firstRow);\n\n    const startPositions = this._getStickyStartColumnPositions(cellWidths, stickyStartStates);\n    const endPositions = this._getStickyEndColumnPositions(cellWidths, stickyEndStates);\n\n    // Coalesce with sticky row updates (and potentially other changes like column resize).\n    this._scheduleStyleChanges(() => {\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]);\n          }\n\n          if (stickyEndStates[i]) {\n            this._addStickyStyle(cell, end, endPositions[i]);\n          }\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 stickyHeights: number[] = [];\n    const elementsToStick: HTMLElement[][] = [];\n    for (let rowIndex = 0, stickyHeight = 0; rowIndex < rows.length; rowIndex++) {\n      stickyHeights[rowIndex] = stickyHeight;\n\n      if (!states[rowIndex]) {\n        continue;\n      }\n\n      const row = rows[rowIndex];\n      elementsToStick[rowIndex] = this._isNativeHtmlTable ?\n          Array.from(row.children) as HTMLElement[] : [row];\n\n      if (rowIndex !== rows.length - 1) {\n        stickyHeight += row.getBoundingClientRect().height;\n      }\n    }\n\n    // Coalesce with other sticky row updates (top/bottom), sticky columns updates\n    // (and potentially other changes like column resize).\n    this._scheduleStyleChanges(() => {\n      for (let rowIndex = 0; rowIndex < rows.length; rowIndex++) {\n        if (!states[rowIndex]) {\n          continue;\n        }\n\n        const height = stickyHeights[rowIndex];\n        for (const element of elementsToStick[rowIndex]) {\n          this._addStickyStyle(element, position, height);\n        }\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._scheduleStyleChanges(() => {\n      if (stickyStates.some(state => !state)) {\n        this._removeStickyStyle(tfoot, ['bottom']);\n      } else {\n        this._addStickyStyle(tfoot, 'bottom', 0);\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    }\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    element.classList.add(this._stickCellCss);\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): number[] {\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    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  /**\n   * Schedules styles to be applied when the style scheduler deems appropriate.\n   * @breaking-change 11.0.0 This method can be removed in favor of calling\n   * `CoalescedStyleScheduler.schedule` directly once the scheduler is a required parameter.\n   */\n  private _scheduleStyleChanges(changes: () => void) {\n    if (this._coalescedStyleScheduler) {\n      this._coalescedStyleScheduler.schedule(changes);\n    } else {\n      changes();\n    }\n  }\n}\n"]}