@material/web/button/internal/button.js

Material web components

/**
 * @license
 * Copyright 2019 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { __decorate } from "tslib";
import '../../focus/md-focus-ring.js';
import '../../ripple/ripple.js';
import { html, isServer, LitElement, nothing } from 'lit';
import { property, query, queryAssignedElements } from 'lit/decorators.js';
import { requestUpdateOnAriaChange } from '../../internal/aria/delegate.js';
import { dispatchActivationClick, isActivationClick, } from '../../internal/controller/events.js';
import { setupFormSubmitter, } from '../../internal/controller/form-submitter.js';
import { internals, mixinElementInternals, } from '../../labs/behaviors/element-internals.js';
// Separate variable needed for closure.
const buttonBaseClass = mixinElementInternals(LitElement);
/**
 * A button component.
 */
export class Button extends buttonBaseClass {
    get name() {
        return this.getAttribute('name') ?? '';
    }
    set name(name) {
        this.setAttribute('name', name);
    }
    /**
     * The associated form element with which this element's value will submit.
     */
    get form() {
        return this[internals].form;
    }
    constructor() {
        super();
        /**
         * Whether or not the button is disabled.
         */
        this.disabled = false;
        /**
         * The URL that the link button points to.
         */
        this.href = '';
        /**
         * Where to display the linked `href` URL for a link button. Common options
         * include `_blank` to open in a new tab.
         */
        this.target = '';
        /**
         * Whether to render the icon at the inline end of the label rather than the
         * inline start.
         *
         * _Note:_ Link buttons cannot have trailing icons.
         */
        this.trailingIcon = false;
        /**
         * Whether to display the icon or not.
         */
        this.hasIcon = false;
        this.type = 'submit';
        this.value = '';
        this.handleActivationClick = (event) => {
            if (!isActivationClick(event) || !this.buttonElement) {
                return;
            }
            this.focus();
            dispatchActivationClick(this.buttonElement);
        };
        if (!isServer) {
            this.addEventListener('click', this.handleActivationClick);
        }
    }
    focus() {
        this.buttonElement?.focus();
    }
    blur() {
        this.buttonElement?.blur();
    }
    render() {
        // Link buttons may not be disabled
        const isDisabled = this.disabled && !this.href;
        const buttonOrLink = this.href ? this.renderLink() : this.renderButton();
        // TODO(b/310046938): due to a limitation in focus ring/ripple, we can't use
        // the same ID for different elements, so we change the ID instead.
        const buttonId = this.href ? 'link' : 'button';
        return html `
      ${this.renderElevationOrOutline?.()}
      <div class="background"></div>
      <md-focus-ring part="focus-ring" for=${buttonId}></md-focus-ring>
      <md-ripple for=${buttonId} ?disabled="${isDisabled}"></md-ripple>
      ${buttonOrLink}
    `;
    }
    renderButton() {
        // Needed for closure conformance
        const { ariaLabel, ariaHasPopup, ariaExpanded } = this;
        return html `<button
      id="button"
      class="button"
      ?disabled=${this.disabled}
      aria-label="${ariaLabel || nothing}"
      aria-haspopup="${ariaHasPopup || nothing}"
      aria-expanded="${ariaExpanded || nothing}">
      ${this.renderContent()}
    </button>`;
    }
    renderLink() {
        // Needed for closure conformance
        const { ariaLabel, ariaHasPopup, ariaExpanded } = this;
        return html `<a
      id="link"
      class="button"
      aria-label="${ariaLabel || nothing}"
      aria-haspopup="${ariaHasPopup || nothing}"
      aria-expanded="${ariaExpanded || nothing}"
      href=${this.href}
      target=${this.target || nothing}
      >${this.renderContent()}
    </a>`;
    }
    renderContent() {
        const icon = html `<slot
      name="icon"
      @slotchange="${this.handleSlotChange}"></slot>`;
        return html `
      <span class="touch"></span>
      ${this.trailingIcon ? nothing : icon}
      <span class="label"><slot></slot></span>
      ${this.trailingIcon ? icon : nothing}
    `;
    }
    handleSlotChange() {
        this.hasIcon = this.assignedIcons.length > 0;
    }
}
(() => {
    requestUpdateOnAriaChange(Button);
    setupFormSubmitter(Button);
})();
/** @nocollapse */
Button.formAssociated = true;
/** @nocollapse */
Button.shadowRootOptions = {
    mode: 'open',
    delegatesFocus: true,
};
__decorate([
    property({ type: Boolean, reflect: true })
], Button.prototype, "disabled", void 0);
__decorate([
    property()
], Button.prototype, "href", void 0);
__decorate([
    property()
], Button.prototype, "target", void 0);
__decorate([
    property({ type: Boolean, attribute: 'trailing-icon', reflect: true })
], Button.prototype, "trailingIcon", void 0);
__decorate([
    property({ type: Boolean, attribute: 'has-icon', reflect: true })
], Button.prototype, "hasIcon", void 0);
__decorate([
    property()
], Button.prototype, "type", void 0);
__decorate([
    property()
], Button.prototype, "value", void 0);
__decorate([
    query('.button')
], Button.prototype, "buttonElement", void 0);
__decorate([
    queryAssignedElements({ slot: 'icon', flatten: true })
], Button.prototype, "assignedIcons", void 0);
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