@ng-bootstrap/ng-bootstrap
Version:
Angular powered Bootstrap
157 lines • 20 kB
JavaScript
import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ContentChild, EventEmitter, forwardRef, Input, Output, TemplateRef, ViewEncapsulation } from '@angular/core';
import { NgbRatingConfig } from './rating-config';
import { getValueInRange } from '../util/util';
import { Key } from '../util/key';
import { NG_VALUE_ACCESSOR } from '@angular/forms';
/**
* A directive that helps visualising and interacting with a star rating bar.
*/
export class NgbRating {
constructor(config, _changeDetectorRef) {
this._changeDetectorRef = _changeDetectorRef;
this.contexts = [];
this.disabled = false;
/**
* An event emitted when the user is hovering over a given rating.
*
* Event payload equals to the rating being hovered over.
*/
this.hover = new EventEmitter();
/**
* An event emitted when the user stops hovering over a given rating.
*
* Event payload equals to the rating of the last item being hovered over.
*/
this.leave = new EventEmitter();
/**
* An event emitted when the user selects a new rating.
*
* Event payload equals to the newly selected rating.
*/
this.rateChange = new EventEmitter(true);
this.onChange = (_) => { };
this.onTouched = () => { };
this.max = config.max;
this.readonly = config.readonly;
}
ariaValueText() { return `${this.nextRate} out of ${this.max}`; }
isInteractive() { return !this.readonly && !this.disabled; }
enter(value) {
if (this.isInteractive()) {
this._updateState(value);
}
this.hover.emit(value);
}
handleBlur() { this.onTouched(); }
handleClick(value) {
if (this.isInteractive()) {
this.update(this.resettable && this.rate === value ? 0 : value);
}
}
handleKeyDown(event) {
// tslint:disable-next-line:deprecation
switch (event.which) {
case Key.ArrowDown:
case Key.ArrowLeft:
this.update(this.rate - 1);
break;
case Key.ArrowUp:
case Key.ArrowRight:
this.update(this.rate + 1);
break;
case Key.Home:
this.update(0);
break;
case Key.End:
this.update(this.max);
break;
default:
return;
}
// note 'return' in default case
event.preventDefault();
}
ngOnChanges(changes) {
if (changes['rate']) {
this.update(this.rate);
}
}
ngOnInit() {
this.contexts = Array.from({ length: this.max }, (v, k) => ({ fill: 0, index: k }));
this._updateState(this.rate);
}
registerOnChange(fn) { this.onChange = fn; }
registerOnTouched(fn) { this.onTouched = fn; }
reset() {
this.leave.emit(this.nextRate);
this._updateState(this.rate);
}
setDisabledState(isDisabled) { this.disabled = isDisabled; }
update(value, internalChange = true) {
const newRate = getValueInRange(value, this.max, 0);
if (this.isInteractive() && this.rate !== newRate) {
this.rate = newRate;
this.rateChange.emit(this.rate);
}
if (internalChange) {
this.onChange(this.rate);
this.onTouched();
}
this._updateState(this.rate);
}
writeValue(value) {
this.update(value, false);
this._changeDetectorRef.markForCheck();
}
_updateState(nextValue) {
this.nextRate = nextValue;
this.contexts.forEach((context, index) => context.fill = Math.round(getValueInRange(nextValue - index, 1, 0) * 100));
}
}
NgbRating.decorators = [
{ type: Component, args: [{
selector: 'ngb-rating',
changeDetection: ChangeDetectionStrategy.OnPush,
encapsulation: ViewEncapsulation.None,
host: {
'class': 'd-inline-flex',
'[tabindex]': 'disabled ? -1 : 0',
'role': 'slider',
'aria-valuemin': '0',
'[attr.aria-valuemax]': 'max',
'[attr.aria-valuenow]': 'nextRate',
'[attr.aria-valuetext]': 'ariaValueText()',
'[attr.aria-disabled]': 'readonly ? true : null',
'(blur)': 'handleBlur()',
'(keydown)': 'handleKeyDown($event)',
'(mouseleave)': 'reset()'
},
template: `
<ng-template #t let-fill="fill">{{ fill === 100 ? '★' : '☆' }}</ng-template>
<ng-template ngFor [ngForOf]="contexts" let-index="index">
<span class="sr-only">({{ index < nextRate ? '*' : ' ' }})</span>
<span (mouseenter)="enter(index + 1)" (click)="handleClick(index + 1)" [style.cursor]="isInteractive() ? 'pointer' : 'default'">
<ng-template [ngTemplateOutlet]="starTemplate || starTemplateFromContent || t" [ngTemplateOutletContext]="contexts[index]">
</ng-template>
</span>
</ng-template>
`,
providers: [{ provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() => NgbRating), multi: true }]
},] }
];
NgbRating.ctorParameters = () => [
{ type: NgbRatingConfig },
{ type: ChangeDetectorRef }
];
NgbRating.propDecorators = {
max: [{ type: Input }],
rate: [{ type: Input }],
readonly: [{ type: Input }],
resettable: [{ type: Input }],
starTemplate: [{ type: Input }],
starTemplateFromContent: [{ type: ContentChild, args: [TemplateRef, { static: false },] }],
hover: [{ type: Output }],
leave: [{ type: Output }],
rateChange: [{ type: Output }]
};
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{\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ContentChild,\n  EventEmitter,\n  forwardRef,\n  Input,\n  OnChanges,\n  OnInit,\n  Output,\n  SimpleChanges,\n  TemplateRef,\n  ViewEncapsulation\n} from '@angular/core';\nimport {NgbRatingConfig} from './rating-config';\nimport {getValueInRange} from '../util/util';\nimport {Key} from '../util/key';\nimport {ControlValueAccessor, NG_VALUE_ACCESSOR} from '@angular/forms';\n\n/**\n * The context for the custom star display template defined in the `starTemplate`.\n */\nexport interface StarTemplateContext {\n  /**\n   * The star fill percentage, an integer in the `[0, 100]` range.\n   */\n  fill: number;\n\n  /**\n   * Index of the star, starts with `0`.\n   */\n  index: number;\n}\n\n/**\n * A directive that helps visualising and interacting with a star rating bar.\n */\n@Component({\n  selector: 'ngb-rating',\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  encapsulation: ViewEncapsulation.None,\n  host: {\n    'class': 'd-inline-flex',\n    '[tabindex]': 'disabled ? -1 : 0',\n    'role': 'slider',\n    'aria-valuemin': '0',\n    '[attr.aria-valuemax]': 'max',\n    '[attr.aria-valuenow]': 'nextRate',\n    '[attr.aria-valuetext]': 'ariaValueText()',\n    '[attr.aria-disabled]': 'readonly ? true : null',\n    '(blur)': 'handleBlur()',\n    '(keydown)': 'handleKeyDown($event)',\n    '(mouseleave)': 'reset()'\n  },\n  template: `\n    <ng-template #t let-fill=\"fill\">{{ fill === 100 ? '&#9733;' : '&#9734;' }}</ng-template>\n    <ng-template ngFor [ngForOf]=\"contexts\" let-index=\"index\">\n      <span class=\"sr-only\">({{ index < nextRate ? '*' : ' ' }})</span>\n      <span (mouseenter)=\"enter(index + 1)\" (click)=\"handleClick(index + 1)\" [style.cursor]=\"isInteractive() ? 'pointer' : 'default'\">\n        <ng-template [ngTemplateOutlet]=\"starTemplate || starTemplateFromContent || t\" [ngTemplateOutletContext]=\"contexts[index]\">\n        </ng-template>\n      </span>\n    </ng-template>\n  `,\n  providers: [{provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() => NgbRating), multi: true}]\n})\nexport class NgbRating implements ControlValueAccessor,\n    OnInit, OnChanges {\n  contexts: StarTemplateContext[] = [];\n  disabled = false;\n  nextRate: number;\n\n\n  /**\n   * The maximal rating that can be given.\n   */\n  @Input() max: number;\n\n  /**\n   * The current rating. Could be a decimal value like `3.75`.\n   */\n  @Input() rate: number;\n\n  /**\n   * If `true`, the rating can't be changed.\n   */\n  @Input() readonly: boolean;\n\n  /**\n   * If `true`, the rating can be reset to `0` by mouse clicking currently set rating.\n   */\n  @Input() resettable: boolean;\n\n  /**\n   * The template to override the way each star is displayed.\n   *\n   * Alternatively put an `<ng-template>` as the only child of your `<ngb-rating>` element\n   */\n  @Input() starTemplate: TemplateRef<StarTemplateContext>;\n  @ContentChild(TemplateRef, {static: false}) starTemplateFromContent: TemplateRef<StarTemplateContext>;\n\n  /**\n   * An event emitted when the user is hovering over a given rating.\n   *\n   * Event payload equals to the rating being hovered over.\n   */\n  @Output() hover = new EventEmitter<number>();\n\n  /**\n   * An event emitted when the user stops hovering over a given rating.\n   *\n   * Event payload equals to the rating of the last item being hovered over.\n   */\n  @Output() leave = new EventEmitter<number>();\n\n  /**\n   * An event emitted when the user selects a new rating.\n   *\n   * Event payload equals to the newly selected rating.\n   */\n  @Output() rateChange = new EventEmitter<number>(true);\n\n  onChange = (_: any) => {};\n  onTouched = () => {};\n\n  constructor(config: NgbRatingConfig, private _changeDetectorRef: ChangeDetectorRef) {\n    this.max = config.max;\n    this.readonly = config.readonly;\n  }\n\n  ariaValueText() { return `${this.nextRate} out of ${this.max}`; }\n\n  isInteractive(): boolean { return !this.readonly && !this.disabled; }\n\n  enter(value: number): void {\n    if (this.isInteractive()) {\n      this._updateState(value);\n    }\n    this.hover.emit(value);\n  }\n\n  handleBlur() { this.onTouched(); }\n\n  handleClick(value: number) {\n    if (this.isInteractive()) {\n      this.update(this.resettable && this.rate === value ? 0 : value);\n    }\n  }\n\n  handleKeyDown(event: KeyboardEvent) {\n    // tslint:disable-next-line:deprecation\n    switch (event.which) {\n      case Key.ArrowDown:\n      case Key.ArrowLeft:\n        this.update(this.rate - 1);\n        break;\n      case Key.ArrowUp:\n      case Key.ArrowRight:\n        this.update(this.rate + 1);\n        break;\n      case Key.Home:\n        this.update(0);\n        break;\n      case Key.End:\n        this.update(this.max);\n        break;\n      default:\n        return;\n    }\n\n    // note 'return' in default case\n    event.preventDefault();\n  }\n\n  ngOnChanges(changes: SimpleChanges) {\n    if (changes['rate']) {\n      this.update(this.rate);\n    }\n  }\n\n  ngOnInit(): void {\n    this.contexts = Array.from({length: this.max}, (v, k) => ({fill: 0, index: k}));\n    this._updateState(this.rate);\n  }\n\n  registerOnChange(fn: (value: any) => any): void { this.onChange = fn; }\n\n  registerOnTouched(fn: () => any): void { this.onTouched = fn; }\n\n  reset(): void {\n    this.leave.emit(this.nextRate);\n    this._updateState(this.rate);\n  }\n\n  setDisabledState(isDisabled: boolean) { this.disabled = isDisabled; }\n\n  update(value: number, internalChange = true): void {\n    const newRate = getValueInRange(value, this.max, 0);\n    if (this.isInteractive() && this.rate !== newRate) {\n      this.rate = newRate;\n      this.rateChange.emit(this.rate);\n    }\n    if (internalChange) {\n      this.onChange(this.rate);\n      this.onTouched();\n    }\n    this._updateState(this.rate);\n  }\n\n  writeValue(value) {\n    this.update(value, false);\n    this._changeDetectorRef.markForCheck();\n  }\n\n  private _updateState(nextValue: number) {\n    this.nextRate = nextValue;\n    this.contexts.forEach(\n        (context, index) => context.fill = Math.round(getValueInRange(nextValue - index, 1, 0) * 100));\n  }\n}\n"]}