2021-03-08 12:51:31 +00:00
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import { LitElement, html, internalProperty, property, query, unsafeCSS } from 'lit-element';
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2021-03-06 17:01:39 +00:00
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import { classMap } from 'lit-html/directives/class-map';
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2021-03-08 12:51:31 +00:00
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import { event, EventEmitter, tag, watch } from '../../internal/decorators';
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2021-02-26 14:09:13 +00:00
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import styles from 'sass:./radio.scss';
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2020-07-15 21:30:37 +00:00
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let id = 0;
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/**
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2020-07-17 10:09:10 +00:00
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* @since 2.0
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* @status stable
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*
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* @slot - The radio's label.
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*
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* @part base - The component's base wrapper.
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* @part control - The radio control.
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* @part checked-icon - The container the wraps the checked icon.
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* @part label - The radio label.
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*/
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@tag('sl-radio')
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export default class SlRadio extends LitElement {
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static styles = unsafeCSS(styles);
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@query('input[type="radio"]') input: HTMLInputElement;
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private inputId = `radio-${++id}`;
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private labelId = `radio-label-${id}`;
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@internalProperty() private hasFocus = false;
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/** The radio's name attribute. */
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@property() name: string;
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/** The radio's value attribute. */
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@property() value: string;
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/** Disables the radio. */
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@property({ type: Boolean, reflect: true }) disabled = false;
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/** Draws the radio in a checked state. */
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@property({ type: Boolean, reflect: true }) checked = false;
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2020-08-28 20:50:18 +00:00
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/**
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* This will be true when the control is in an invalid state. Validity in range inputs is determined by the message
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* provided by the `setCustomValidity` method.
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*/
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@property({ type: Boolean, reflect: true }) invalid = false;
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/** Emitted when the control loses focus. */
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@event('sl-blur') slBlur: EventEmitter<void>;
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/** Emitted when the control's checked state changes. */
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@event('sl-change') slChange: EventEmitter<void>;
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/** Emitted when the control gains focus. */
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@event('sl-focus') slFocus: EventEmitter<void>;
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/** Sets focus on the radio. */
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setFocus(options?: FocusOptions) {
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this.input.focus(options);
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}
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/** Removes focus from the radio. */
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removeFocus() {
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this.input.blur();
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}
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/** Checks for validity and shows the browser's validation message if the control is invalid. */
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reportValidity() {
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return this.input.reportValidity();
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}
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/** Sets a custom validation message. If `message` is not empty, the field will be considered invalid. */
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setCustomValidity(message: string) {
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this.input.setCustomValidity(message);
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this.invalid = !this.input.checkValidity();
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}
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getAllRadios() {
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const form = this.closest('sl-form, form') || document.body;
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if (!this.name) return [];
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return [...form.querySelectorAll('sl-radio')].filter((radio: this) => radio.name === this.name) as this[];
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}
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getSiblingRadios() {
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return this.getAllRadios().filter(radio => radio !== this) as this[];
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}
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@watch('checked')
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handleCheckedChange() {
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if (this.checked) {
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this.getSiblingRadios().map(radio => (radio.checked = false));
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}
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this.input.checked = this.checked;
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this.slChange.emit();
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}
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handleClick() {
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this.checked = true;
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}
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handleBlur() {
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this.hasFocus = false;
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this.slBlur.emit();
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}
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handleFocus() {
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this.hasFocus = true;
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this.slFocus.emit();
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}
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handleKeyDown(event: KeyboardEvent) {
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if (['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight'].includes(event.key)) {
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const radios = this.getAllRadios().filter(radio => !radio.disabled);
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const incr = ['ArrowUp', 'ArrowLeft'].includes(event.key) ? -1 : 1;
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let index = radios.indexOf(this) + incr;
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if (index < 0) index = radios.length - 1;
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if (index > radios.length - 1) index = 0;
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this.getAllRadios().map(radio => (radio.checked = false));
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radios[index].setFocus();
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radios[index].checked = true;
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event.preventDefault();
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}
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}
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handleMouseDown(event: MouseEvent) {
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// Prevent clicks on the label from briefly blurring the input
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event.preventDefault();
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this.input.focus();
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}
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render() {
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return html`
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<label
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part="base"
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class=${classMap({
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radio: true,
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'radio--checked': this.checked,
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'radio--disabled': this.disabled,
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'radio--focused': this.hasFocus
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})}
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for=${this.inputId}
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@keydown=${this.handleKeyDown}
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@mousedown=${this.handleMouseDown}
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>
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<span part="control" class="radio__control">
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<span part="checked-icon" class="radio__icon">
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<svg viewBox="0 0 16 16">
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<g stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
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<g fill="currentColor">
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<circle cx="8" cy="8" r="3.42857143"></circle>
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</g>
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</g>
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</svg>
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</span>
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<input
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id=${this.inputId}
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type="radio"
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name=${this.name}
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.value=${this.value}
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?checked=${this.checked}
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?disabled=${this.disabled}
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role="radio"
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aria-checked=${this.checked ? 'true' : 'false'}
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aria-labelledby=${this.labelId}
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@click=${this.handleClick}
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@blur=${this.handleBlur}
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@focus=${this.handleFocus}
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/>
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</span>
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<span part="label" id=${this.labelId} class="radio__label">
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<slot></slot>
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</span>
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</label>
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`;
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}
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}
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declare global {
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interface HTMLElementTagNameMap {
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'sl-radio': SlRadio;
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}
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}
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