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

Material web components

/**
 * @license
 * Copyright 2019 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
var _a;
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 { classMap } from 'lit/directives/class-map.js';
import { html as staticHtml, literal } from 'lit/static-html.js';
import { requestUpdateOnAriaChange } from '../../internal/aria/delegate.js';
import { internals } from '../../internal/controller/element-internals.js';
import { dispatchActivationClick, isActivationClick } from '../../internal/controller/events.js';
import { setupFormSubmitter } from '../../internal/controller/form-submitter.js';
/**
 * A button component.
 */
export class Button extends LitElement {
    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 = '';
        /** @private */
        this[_a] = this /* needed for closure */.attachInternals();
        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 button = this.href ? literal `a` : literal `button`;
        // Needed for closure conformance
        const { ariaLabel, ariaHasPopup, ariaExpanded } = this;
        return staticHtml `
      <${button}
        class="button ${classMap(this.getRenderClasses())}"
        ?disabled=${isDisabled}
        aria-label="${ariaLabel || nothing}"
        aria-haspopup="${ariaHasPopup || nothing}"
        aria-expanded="${ariaExpanded || nothing}"
        href=${this.href || nothing}
        target=${this.target || nothing}
      >${this.renderContent()}</${button}>`;
    }
    getRenderClasses() {
        return {
            'button--icon-leading': !this.trailingIcon && this.hasIcon,
            'button--icon-trailing': this.trailingIcon && this.hasIcon,
        };
    }
    renderContent() {
        // Link buttons may not be disabled
        const isDisabled = this.disabled && !this.href;
        const icon = html `<slot name="icon" @slotchange="${this.handleSlotChange}"></slot>`;
        return html `
      ${this.renderElevation?.()}
      ${this.renderOutline?.()}
      <md-focus-ring part="focus-ring"></md-focus-ring>
      <md-ripple class="button__ripple" ?disabled="${isDisabled}"></md-ripple>
      <span class="touch"></span>
      ${this.trailingIcon ? nothing : icon}
      <span class="button__label"><slot></slot></span>
      ${this.trailingIcon ? icon : nothing}
    `;
    }
    handleSlotChange() {
        this.hasIcon = this.assignedIcons.length > 0;
    }
}
_a = internals;
(() => {
    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' })
], Button.prototype, "trailingIcon", void 0);
__decorate([
    property({ type: Boolean, attribute: 'has-icon' })
], 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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