@angular/cdk
Version:
Angular Material Component Development Kit
119 lines • 15.8 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
*/
import { Directionality } from '@angular/cdk/bidi';
import { coerceNumberProperty } from '@angular/cdk/coercion';
import { Directive, ElementRef, Input, Optional } from '@angular/core';
import { takeUntil } from 'rxjs/operators';
import { Subject } from 'rxjs';
import { CdkTree, CdkTreeNode } from './tree';
/** Regex used to split a string on its CSS units. */
const cssUnitPattern = /([A-Za-z%]+)$/;
/**
* Indent for the children tree dataNodes.
* This directive will add left-padding to the node to show hierarchy.
*/
export class CdkTreeNodePadding {
constructor(_treeNode, _tree, _element, _dir) {
this._treeNode = _treeNode;
this._tree = _tree;
this._element = _element;
this._dir = _dir;
/** Subject that emits when the component has been destroyed. */
this._destroyed = new Subject();
/** CSS units used for the indentation value. */
this.indentUnits = 'px';
this._indent = 40;
this._setPadding();
if (_dir) {
_dir.change.pipe(takeUntil(this._destroyed)).subscribe(() => this._setPadding(true));
}
// In Ivy the indentation binding might be set before the tree node's data has been added,
// which means that we'll miss the first render. We have to subscribe to changes in the
// data to ensure that everything is up to date.
_treeNode._dataChanges.subscribe(() => this._setPadding());
}
/** The level of depth of the tree node. The padding will be `level * indent` pixels. */
get level() { return this._level; }
set level(value) { this._setLevelInput(value); }
/**
* The indent for each level. Can be a number or a CSS string.
* Default number 40px from material design menu sub-menu spec.
*/
get indent() { return this._indent; }
set indent(indent) { this._setIndentInput(indent); }
ngOnDestroy() {
this._destroyed.next();
this._destroyed.complete();
}
/** The padding indent value for the tree node. Returns a string with px numbers if not null. */
_paddingIndent() {
const nodeLevel = (this._treeNode.data && this._tree.treeControl.getLevel)
? this._tree.treeControl.getLevel(this._treeNode.data)
: null;
const level = this._level == null ? nodeLevel : this._level;
return typeof level === 'number' ? `${level * this._indent}${this.indentUnits}` : null;
}
_setPadding(forceChange = false) {
const padding = this._paddingIndent();
if (padding !== this._currentPadding || forceChange) {
const element = this._element.nativeElement;
const paddingProp = this._dir && this._dir.value === 'rtl' ? 'paddingRight' : 'paddingLeft';
const resetProp = paddingProp === 'paddingLeft' ? 'paddingRight' : 'paddingLeft';
element.style[paddingProp] = padding || '';
element.style[resetProp] = '';
this._currentPadding = padding;
}
}
/**
* This has been extracted to a util because of TS 4 and VE.
* View Engine doesn't support property rename inheritance.
* TS 4.0 doesn't allow properties to override accessors or vice-versa.
* @docs-private
*/
_setLevelInput(value) {
// Set to null as the fallback value so that _setPadding can fall back to the node level if the
// consumer set the directive as `cdkTreeNodePadding=""`. We still want to take this value if
// they set 0 explicitly.
this._level = coerceNumberProperty(value, null);
this._setPadding();
}
/**
* This has been extracted to a util because of TS 4 and VE.
* View Engine doesn't support property rename inheritance.
* TS 4.0 doesn't allow properties to override accessors or vice-versa.
* @docs-private
*/
_setIndentInput(indent) {
let value = indent;
let units = 'px';
if (typeof indent === 'string') {
const parts = indent.split(cssUnitPattern);
value = parts[0];
units = parts[1] || units;
}
this.indentUnits = units;
this._indent = coerceNumberProperty(value);
this._setPadding();
}
}
CdkTreeNodePadding.decorators = [
{ type: Directive, args: [{
selector: '[cdkTreeNodePadding]',
},] }
];
CdkTreeNodePadding.ctorParameters = () => [
{ type: CdkTreeNode },
{ type: CdkTree },
{ type: ElementRef },
{ type: Directionality, decorators: [{ type: Optional }] }
];
CdkTreeNodePadding.propDecorators = {
level: [{ type: Input, args: ['cdkTreeNodePadding',] }],
indent: [{ type: Input, args: ['cdkTreeNodePaddingIndent',] }]
};
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Used to avoid unnecessarily hitting the DOM. */\n  private _currentPadding: string|null;\n\n  /** Subject that emits when the component has been destroyed. */\n  private _destroyed = new Subject<void>();\n\n  /** CSS units used for the indentation value. */\n  indentUnits = 'px';\n\n  /** The level of depth of the tree node. The padding will be `level * indent` pixels. */\n  @Input('cdkTreeNodePadding')\n  get level(): number { return this._level; }\n  set level(value: number) { this._setLevelInput(value); }\n  _level: number;\n\n  /**\n   * The indent for each level. Can be a number or a CSS string.\n   * Default number 40px from material design menu sub-menu spec.\n   */\n  @Input('cdkTreeNodePaddingIndent')\n  get indent(): number | string { return this._indent; }\n  set indent(indent: number | string) { this._setIndentInput(indent); }\n  _indent: number = 40;\n\n  constructor(private _treeNode: CdkTreeNode<T>,\n              private _tree: CdkTree<T>,\n              private _element: ElementRef<HTMLElement>,\n              @Optional() private _dir: Directionality) {\n    this._setPadding();\n    if (_dir) {\n      _dir.change.pipe(takeUntil(this._destroyed)).subscribe(() => this._setPadding(true));\n    }\n\n    // In Ivy the indentation binding might be set before the tree node's data has been added,\n    // which means that we'll miss the first render. We have to subscribe to changes in the\n    // data to ensure that everything is up to date.\n    _treeNode._dataChanges.subscribe(() => this._setPadding());\n  }\n\n  ngOnDestroy() {\n    this._destroyed.next();\n    this._destroyed.complete();\n  }\n\n  /** The padding indent value for the tree node. Returns a string with px numbers if not null. */\n  _paddingIndent(): string|null {\n    const nodeLevel = (this._treeNode.data && this._tree.treeControl.getLevel)\n      ? this._tree.treeControl.getLevel(this._treeNode.data)\n      : null;\n    const level = this._level == null ? nodeLevel : this._level;\n    return typeof level === 'number' ? `${level * this._indent}${this.indentUnits}` : null;\n  }\n\n  _setPadding(forceChange = false) {\n    const padding = this._paddingIndent();\n\n    if (padding !== this._currentPadding || forceChange) {\n      const element = this._element.nativeElement;\n      const paddingProp = this._dir && this._dir.value === 'rtl' ? 'paddingRight' : 'paddingLeft';\n      const resetProp = paddingProp === 'paddingLeft' ? 'paddingRight' : 'paddingLeft';\n      element.style[paddingProp] = padding || '';\n      element.style[resetProp] = '';\n      this._currentPadding = padding;\n    }\n  }\n\n  /**\n   * This has been extracted to a util because of TS 4 and VE.\n   * View Engine doesn't support property rename inheritance.\n   * TS 4.0 doesn't allow properties to override accessors or vice-versa.\n   * @docs-private\n   */\n  protected _setLevelInput(value: number) {\n    // Set to null as the fallback value so that _setPadding can fall back to the node level if the\n    // consumer set the directive as `cdkTreeNodePadding=\"\"`. We still want to take this value if\n    // they set 0 explicitly.\n    this._level = coerceNumberProperty(value, null)!;\n    this._setPadding();\n  }\n\n  /**\n   * This has been extracted to a util because of TS 4 and VE.\n   * View Engine doesn't support property rename inheritance.\n   * TS 4.0 doesn't allow properties to override accessors or vice-versa.\n   * @docs-private\n   */\n  protected _setIndentInput(indent: number | string) {\n    let value = indent;\n    let units = 'px';\n\n    if (typeof indent === 'string') {\n      const parts = indent.split(cssUnitPattern);\n      value = parts[0];\n      units = parts[1] || units;\n    }\n\n    this.indentUnits = units;\n    this._indent = coerceNumberProperty(value);\n    this._setPadding();\n  }\n\n  static ngAcceptInputType_level: NumberInput;\n}\n"]}