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/*! * VisualEditor TabIndexScope class. * * @copyright See AUTHORS.txt */ /** * TabIndex Scope container constructor * * @class * @constructor * * @param {Object} [config] Configuration options * @param {jQuery} [config.root] Initial root element to scope tabIndex within * @param {boolean} [config.skipAriaDisabled] Whether to skip elements that are just aria-disabled from the order */ ve.ui.TabIndexScope = function VeUiTabIndexScope( config ) { config = ve.extendObject( { root: false, skipAriaDisabled: true, skipAriaHidden: true }, config ); this.skipAriaDisabled = config.skipAriaDisabled; this.skipAriaHidden = config.skipAriaHidden; this.onRootKeyDownBound = this.onRootKeyDown.bind( this ); if ( config.root ) { this.setTabRoot( config.root ); } }; /* Setup */ OO.initClass( ve.ui.TabIndexScope ); /* Methods */ /** * Set the current root element for tabbing * * @param {jQuery} $root root element to scope tabIndex within */ ve.ui.TabIndexScope.prototype.setTabRoot = function ( $root ) { if ( this.$root ) { this.$root.off( 'keydown', this.onRootKeyDownBound ); } this.$root = $( $root ).on( 'keydown', this.onRootKeyDownBound ); }; /** * Build a list of elements in the current root, in tab order * * This mimics browser behavior: fetch focusable elements, sort by [tabIndex, DOM order] * * @return {HTMLElement[]} list of elements in the order they should be tabbed through */ ve.ui.TabIndexScope.prototype.getElementsInRoot = function () { const elements = this.$root.find( '*' ) .filter( ( index, element ) => { if ( element.tabIndex === -1 ) { // tabIndex -1 is focusable, but shouldn't appear to keyboard-navigation return false; } if ( this.skipAriaDisabled && element.getAttribute( 'aria-disabled' ) === 'true' ) { return false; } if ( this.skipAriaHidden && $( element ).closest( '[aria-hidden="true"]', this.$root[ 0 ] ).length ) { return false; } if ( element.isContentEditable && element.contentEditable !== 'true' ) { // Skip nodes within contentEditable nodes (but not the root contentEditable nodes), // which would be focusable if they weren't editable, e.g. links. // This matches browser behavior. return false; } return OO.ui.isFocusableElement( $( element ) ); } ) .map( ( index, element ) => ( { element: element, index: index } ) ) .get(); elements.sort( ( a, b ) => { if ( a.element.tabIndex < b.element.tabIndex ) { return -1; } if ( a.element.tabIndex > b.element.tabIndex ) { return 1; } return a.index - b.index; } ); return elements.map( ( data ) => data.element ); }; /** * Handle keydown events on elements * * @private * @param {jQuery.Event} e */ ve.ui.TabIndexScope.prototype.onRootKeyDown = function ( e ) { if ( e.which !== OO.ui.Keys.TAB ) { return; } const elements = this.getElementsInRoot(); let index = elements.indexOf( e.target ); if ( index === -1 ) { return; } index += e.shiftKey ? -1 : 1; if ( ( index < 0 || index >= elements.length ) ) { return; } e.preventDefault(); elements[ index ].focus(); }; /** * Teardown tabbable elements manager */ ve.ui.TabIndexScope.prototype.teardown = function () { this.setRoot( [] ); };
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