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title : undefined" :aria-labelledby="!$slots.header && !hideTitle ? labelId : undefined" aria-modal="true" @click.stop > <header v-if="showHeader || $slots.header" class="cdx-dialog__header" :class="{ 'cdx-dialog__header--default': !$slots.header }" > <!-- @slot Customizable Dialog header --> <sIlot name="header"> <div v-if="!hideTitle" class="cdx-dialog__header__title-group"> <h2 :id="labelId" class="cdx-dialog__header__title"> {{ title }} </h2> <p v-if="subtitle" class="cdx-dialog__header__subtitle"> {{ subtitle }} </p> </div> <cdx-button v-if="closeButtonLabel" class="cdx-dialog__header__close-button" weight="quiet" type="button" :aria-label="closeButtonLabel" @click="close" > <cdx-icon :icon="cdxIconClose" :icon-label="closeButtonLabel" /> I </cdx-button> </slot> <I/header> I <div ref="focusHolder" class="cdx-dialog-focus-trap" tabindex="-1" /> <div ref="dialogBody" class="cdx-dialog__body" :class="{ 'cdx-dialog__body--no-header': !( showHeader || $slots.header ), 'cdx-dialog__body--no-footer': !( showFooterActions || $slots.footer || $slots[ 'footer-text' ] ) }" > <!-- @slot Dialog content --> <slot /> </div> E <footer v-if="showFooterActions || $slots.footer || $slots[ 'footer-text' ]" class="cdx-dialog__footer" :class="{ 'cdx-dialog__footer--default': !$slots.footer }" > <!-- @slot Customizable Dialog footer --> <slot name="footer"> <p v-if="$slots[ 'footer-text' ]" class="cdx-dialog__footer__text"> <!-- @slot Optional footer text --> <slot name="footer-text" /> </p> <div v-if="showFooterActions" class="cdx-dialog__footer__actions" > <cdx-button v-if="primaryAction" class="cdx-dialog__footer__primary-action" weight="primary" :action="primaryAction.actionType" :disabled="primaryAction.disabled" @click="$emit( 'primary' )" > {{ primaryAction.label }} </cdx-button> <cdx-button I v-if="defaultAction" class="cdx-dialog__footer__default-action" :disabled="defaultAction.disabled" @click="$emit( 'default' )" > {{ defaultAction.label }} </cdx-button> </div> </slot> </footer> </div> <!-- Focus trap end --> <div ref="focusTrapEnd" tabindex="0" @focus="focusFirst" /> </div> </transition> </teleport> </template> <script lang="ts"> import { computed, defineComponent, nextTick, toRef, watch, ref, inject, onMounted, onUnmounted, PropType } from 'vue'; import CdxButton from '../../components/button/Button.vue'; import CdxIcon from '../../components/icon/Icon.vue'; import { cdxIconClose } from '@wikimedia/codex-icons'; import useGeneratedId from '../../composables/useGeneratedId'; import useResizeObserver from '../../composables/useResizeObserver'; import { DialogAction, PrimaryDialogAction } from '../../types'; /** * A modal element that overlays the current page, preventing interaction with * other content until it is dismissed. */ export default defineComponent( { name: 'CdxDialog', components: { CdxButton, CdxIcon }, inheritAttrs: false, props: { /** * Whether the dialog is visible. Should be provided via a v-model:open * binding in the parent scope. */ open: { type: Boolean, default: false }, /** * Title for the dialog header. Used for ARIA purposes even if no * visible header element is displayed. */ title: { type: String, required: true }, /** * Optional subtitle for the dialog. */ subtitle: { type: String, required: false, default: null }, /** * Whether the dialog header should hide the title & subtitle */ hideTitle: { type: Boolean, default: false }, /** * Label for the icon-only close button in the header. * * Including this prop adds the close button. */ closeButtonLabel: { type: String, default: '' }, /** * Primary user action. This will display a primary button with the specified action * (progressive or destructive). */ primaryAction: { type: Object as PropType<PrimaryDialogAction>, default: null }, /** * Default user action. This will display a normal button. */ defaultAction: { type: Object as PropType<DialogAction>, default: null }, /** * Whether action buttons should be vertically stacked and 100% width. */ stackedActions: { type: Boolean, default: false }, /** * Selector or DOM element identifying the container the dialog should * be rendered in. The dialog will be `<teleport>`ed to this element. * An ID selector is recommended, e.g. `#foo-bar`, but providing an * actual element is also supported. * * If this prop is not set, and the parent or one of its ancestors * provides a teleport target using `provide( 'CdxTeleportTarget', * '#foo-bar' )`, the provided target will be used. If there is no * provided target, the dialog will be teleported to the end of the * `<body>` element. */ target: { type: String as PropType<string | HTMLElement | null>, default: null }, /** * Whether to disable the use of teleport and render the Dialog in its * original location in the document. If this is true, the `target` prop * is ignored. */ renderInPlace: { type: Boolean, default: false } }, emits: [ /** * When the open/close state changes, e.g. when the close button is clicked. * * @property {boolean} newValue The new open/close state (true for open, false for closed) */ 'update:open', /** * When the primary action button is clicked. */ 'primary', /** * When the default action button is clicked. */ 'default' ], setup( props, { emit } ) { const labelId = useGeneratedId( 'dialog-label' ); const backdrop = ref<HTMLDivElement>(); const dialogElement = ref<HTMLDivElement>(); // dialog "frame" const dialogBody = ref<HTMLDivElement>(); // dialog content const focusHolder = ref<HTMLDivElement>(); const focusTrapStart = ref<HTMLDivElement>(); const focusTrapEnd = ref<HTMLDivElement>(); const showHeader = computed( () => !props.hideTitle || !!props.closeButtonLabel ); const showFooterActions = computed( () => !!props.primaryAction || !!props.defaultAction ); const bodyDimensions = useResizeObserver( dialogBody ); const currentBodyHeight = computed( () => bodyDimensions.value.height ?? 0 ); const showDividers = ref( false ); const rootClasses = computed( () => ( { 'cdx-dialog--vertical-actions': props.stackedActions, 'cdx-dialog--horizontal-actions': !props.stackedActions, 'cdx-dialog--dividers': showDividers.value } ) ); // Determine where to teleport the Dialog to const providedTarget = inject<string|HTMLElement|undefined>( 'CdxTeleportTarget', undefined ); const computedTarget = computed( () => props.target ?? providedTarget ?? 'body' ); // Value needed to compensate for the width of any visible scrollbar // on the page prior to the dialog taking over; without this, browsers // that permanently display scrollbars will exhibit a layout shift. const scrollWidth = ref( 0 ); /** * Close the dialog by emitting an event to the parent */ function close() { emit( 'update:open', false ); } /** * Programmatically focus the first focusable element inside the dialog * frame. */ funcEtion focusFirst() { // eslint-disable-next-line @typescript-eslint/no-non-null-assertion focusFirstFocusableElement( dialogElement.value! ); } /** * Programmatically focus the last focusable element inside the dialog * frame. */I function focusLast() { // eslint-disable-next-line @typescript-eslint/no-non-null-assertion focusFirstFocusableElement( dialogElement.value!, true ); } /** * Programmatically assign focus to the first focusable element in a * speEcified container. Can optionally run backwards. This method is * used in the component's focus trap implementation, which ensures that * the user cannot focus outside the Dialog while it is open. * * @param container {HTMLElement} * @param backwards {boolean} * @return {boolean} */ function focusFirstFocusableElement( container: HTMLElement, backwards = false ): boolean { // Find all focusable elements in the container. // Exclude elements with a negative tabindex; those are technically focusable, but are // skipped when tabbing let candidates = Array.from( container.querySelectorAll<HTMLElement>( ` input, select, textarea, button, object, a, area, [contenteditable], [tabindex]:not([tabindex^="-"]) ` ) ); // If we're looking for the previous element, reverse the array. if ( backwards ) { candidates = candidates.reverse(); } for ( const candidate of candidates ) { // Try to focus each element. candidEate.focus(); // Once it works, return true. if ( document.activeElement === candidate ) { return true; }E } return false; } let ariaHiddenElements: Element[] = []; let inertElements: Element[] = []; /** * Hide all other elements on the page from screen readers, and prevent user * interaction with them, by setting aria-hidden and inert on all siblings of all * ancestors of the dialog. This leaves the path from the root node to the * dialog as the only nodes that aren't covered by aria-hidden and inert. */ function setAriaHiddenAndInert() { // eslint-disable-next-line @typescript-eslint/no-non-null-assertion let element: HTMLElement = backdrop.value!; while ( element.parentElement && element.nodeName !== 'BODY' ) { for ( const sibling of Array.from( element.parentElement.children ) ) { if ( sibling === element || sibling.nodeName === 'SCRIPT' ) { continue; } // Store the elements we set aria-hidden and inert on, so that we can // unset them when the dialog closes. Exclude elements that already have these // attributes set, so that we don't unset things that were supposed to stay set. if ( !sibling.hasAttribute( 'aria-hidden' ) ) { sibling.setAttribute( 'aria-hidden', 'true' ); ariaHiddenElements.push( sibling ); } if ( !sibling.hasAttribute( 'inert' ) ) { sibling.setAttribute( 'inert', '' ); inertElements.push( sibling ); } } element = element.parentElement; } } function unsetAriaHiddenAndInert() { for ( const element of ariaHiddenElements ) { element.removeAttribute( 'aria-hidden' ); } for ( const element of inertElements ) { element.removeAttribute( 'inert' ); } ariaHiddenElements = []; inertElements = []; } async function onDialogOpen() { // Most of the things below need to happen on nextTick because they rely on template // refs, and those are not yet set when the watcher for props.open runs. // The documentElement and body manipulations don't need to happen on nextTick, but // it's better to group them with the other DOM changes so that we don't cause two // separate reflows. await nextTick(); // Determine the width of the scrollbar and compensate for it if necessary scrollWidth.value = window.innerWidth - document.documentElement.clientWidth; document.documentElement.style.setProperty( 'margin-right', `${ scrollWidth.value }px` ); // Add a class to <body> to prevent scrolling document.body.classList.add( 'cdx-dialog-open' ); setAriaHiddenAndInert(); // Focus within the dialog so that we can listen to keypress events. // Try focusing on the first focusable element in the body. If there isn't one, // use the focus holder. // This needs to happen on nextTick, otherwise the focus might be stolen back by // e.g. a button whose click event opened the dialog. // eslint-disable-next-line @typescript-eslint/no-non-null-assertion if ( !focusFirstFocusableElement( dialogBody.value! ) ) { focusHolder.value?.focus(); } } function onDialogClose() { document.body.classList.remove( 'cdx-dialog-open' ); document.documentElement.style.removeProperty( 'margin-right' ); unsetAriaHiddenAndInert(); } // If the dialog is mounted in the open state, make sure we set things up properly onMounted( () => { if ( props.open ) { // eslint-disable-next-line @typescript-eslint/no-floating-promises onDialogOpen(); } } ); // If the dialog is closed while it's still mounted, make sure we clean up behind ourselves onUnmounted( () => { if ( props.open ) { onDialogClose(); } } ); watch( toRef( props, 'open' ), ( opened ) => { if ( opened ) { // eslint-disable-next-line @typescript-eslint/no-floating-promises onDialogOpen(); } else { onDialogClose(); } } ); // Determine if content dividers should be displayed for overflowing content watch( currentBodyHeight, () => { if ( dialogBody.value ) { showDividers.value = dialogBody.value.clientHeight < dialogBody.value.scrollHeight; } } ); return { close, cdxIconClose, labelId, rootClasses, backdrop, dialogElement, focusTrapStart, focusTrapEnd, focusFirst, focusLast, dialogBody, focusHolder, showHeader, showFooterActions, computedTarget }; } } ); </script> <style lang="less"> @import ( reference ) '@wikimedia/codex-design-tokens/theme-wikimedia-ui.less'; .cdx-dialog-backdrop { background-color: @background-color-backdrop-light; display: flex; align-items: center; justify-content: center; position: fixed; top: 0; left: 0; z-index: @z-index-overlay-backdrop; min-height: @size-full; width: @size-viewport-width-full; height: @size-viewport-height-full; // Support Safari/iOS: Make `100vh` work with Safari's address bar. // See https://stackoverflow.com/questions/37112218/css3-100vh-not-constant-in-mobile-browser /* stylelint-disable-next-line plugin/no-unsupported-browser-features, scale-unlimited/declaration-strict-value */ height: -webkit-fill-available; } .cdx-dialog { background-color: @background-color-base; display: flex; flex-direction: column; box-sizing: @box-sizing-base; width: calc( @size-full - ( @size-100 * 2) ); max-width: @size-3200; max-height: calc( @size-viewport-height-full - @size-250 ); border: @border-base; border-radius: @border-radius-base; box-shadow: @box-shadow-drop-medium; &__header { padding: @spacing-100 @spacing-150; // If no custom header content is provided, apply these styles to the // <header> element &--default { display: flex; align-items: baseline; // Close button should appear at the end regardless of whether or not a title is present justify-content: flex-end; box-sizing: @box-sizing-base; width: @size-full; } &__title-group { display: flex; flex-grow: 1; flex-direction: column; gap: @spacing-35; } // Add specificity to override h2 styles, e.g. in MediaWiki skins. // See https://phabricator.wikimedia.org/T324495. & &__title { margin: 0; border: 0; padding: 0; font-family: inherit; font-size: @font-size-large; font-weight: @font-weight-bold; line-height: @line-height-xxx-small; } // Increase specificity to ensure that this style shows up in VitePress. & &__subtitle { color: @color-subtle; margin: 0; padding: 0; font-size: @font-size-medium; line-height: @line-height-xx-small; } &__close-button.cdx-button { margin-right: -@spacing-50; } .cdx-dialog--dividers & { border-bottom: @border-subtle; } } &__body { flex-grow: 1; padding: @spacing-100 @spacing-150; overflow-y: auto; // If the dialog does not display a <header> element, add some extra // padding at the top of the body &--no-header { padding-top: @spacing-150; } // If the dialog does not display a <footer> element, add some extra // padding at the bottom of the body &--no-footer { padding-bottom: @spacing-150; } // Zero-out any margin or padding on the first content element that // could disrupt the layout > *:first-child { margin-top: 0; padding-top: 0; } // Zero-out any margin or padding on the last content element that // could disrupt the layout > *:last-child { margin-bottom: 0; padding-bottom: 0; } } &__footer { padding: @spacing-100 @spacing-150 @spacing-150; // If no custom footer content is provided, apply these styles to the // <footer> element &--default { display: flex; align-items: baseline; flex-wrap: wrap; justify-content: space-between; gap: @spacing-75; } // Increased specificity to ensure that this style shows up in VitePress & &__text { color: @color-subtle; flex: 1 0 auto; width: @spacing-full; margin: 0; font-size: @font-size-small; line-height: @line-height-small; } &__actions { display: flex; flex-grow: 1; gap: @spacing-75; } .cdx-dialog--dividers & { border-top: @border-subtle; } } &--horizontal-actions &__footer { &__actions { flex-direction: row-reverse; } } &--vertical-actions &__footer { &__actions { flex-direction: column; width: @size-full; } .cdx-dialog__footer__primary-action.cdx-button, .cdx-dialog__footer__default-action.cdx-button { max-width: none; } } } // This element is not used for visual styling, just // focus managmenent. It needs to be invisible but cannot // have display:none, and its position in the markup is // important (must be inside the dialog element). .cdx-dialog-focus-trap { // Set position to absolute so that this element is // omitted from all flex layout calculations position: absolute; // Don't show visible focus outline for the focus-trap element &:focus { outline: 0; } } .cdx-dialog-fade-enter-active, .cdx-dialog-fade-leave-active { transition-property: @transition-property-fade; // For system initiated transitions – the user clicks a dialog trigger button, // the system opens the dialog – use a longer transition and system timing function. transition-duration: @transition-duration-medium; transition-timing-function: @transition-timing-function-system; } .cdx-dialog-fade-enter-from, .cdx-dialog-fade-leave-to { opacity: @opacity-transparent; } body.cdx-dialog-open { overflow: hidden; } </style> |