feat(SelectDialog): add SR announcement for number of selected items

Author: Lukas742

packages/main/src/components/SelectDialog/SelectDialog.cy.tsx

@@ -295,4 +295,24 @@ describe('SelectDialog', () => {
     cy.findByTestId('confirmBtn').should('be.visible').and('have.attr', 'disabled');
     cy.findByTestId('confirmBtn').should('have.attr', 'design', 'Emphasized');
   });
+
+  it('invisible messaging', () => {
+    cy.mount(
+      <SelectDialog open selectionMode={ListSelectionMode.Multiple}>
+        <ListItemStandard text={'ListItem 1'} data-testid="1" />
+        <ListItemStandard text={'ListItem 2'} data-testid="2" />
+        <ListItemStandard text={'ListItem 3'} data-testid="3" />
+        <ListItemStandard text={'ListItem 4'} data-testid="4" />
+      </SelectDialog>,
+    );
+    cy.findByTestId('1').click();
+    cy.findByText('Selected Items 1').should('exist');
+    cy.findByTestId('1').click();
+    cy.findByText('Selected Items 1').should('not.exist');
+    cy.findByTestId('1').click();
+    cy.findByTestId('2').click();
+    cy.findByTestId('3').click();
+    cy.findByTestId('4').click();
+    cy.findByText('Selected Items 4').should('exist');
+  });
 });

packages/main/src/components/SelectDialog/index.tsx

@@ -4,13 +4,17 @@ import ButtonDesign from '@ui5/webcomponents/dist/types/ButtonDesign.js';
 import IconMode from '@ui5/webcomponents/dist/types/IconMode.js';
 import InputType from '@ui5/webcomponents/dist/types/InputType.js';
 import ListSelectionMode from '@ui5/webcomponents/dist/types/ListSelectionMode.js';
+import InvisibleMessageMode from '@ui5/webcomponents-base/dist/types/InvisibleMessageMode.js';
+import announce from '@ui5/webcomponents-base/dist/util/InvisibleMessage.js';
 import iconDecline from '@ui5/webcomponents-icons/dist/decline.js';
 import iconSearch from '@ui5/webcomponents-icons/dist/search.js';
 import { enrichEventWithDetails, useI18nBundle, useStylesheet, useSyncRef } from '@ui5/webcomponents-react-base';
 import { clsx } from 'clsx';
 import type { ReactNode } from 'react';
 import { forwardRef, useEffect, useState } from 'react';
-import { CANCEL, CLEAR, RESET, SEARCH, SELECT, SELECTED } from '../../i18n/i18n-defaults.js';
+// todo: remove comment once translations are available
+// eslint-disable-next-line @typescript-eslint/no-unused-vars
+import { CANCEL, CLEAR, RESET, SEARCH, SELECT, SELECTED, SELECTED_ITEMS } from '../../i18n/i18n-defaults.js';
 import { Button, Dialog, FlexBox, FlexBoxAlignItems, Icon, Input, List, Text, Title } from '../../index.js';
 import type { Ui5CustomEvent } from '../../types/index.js';
 import type {
@@ -218,12 +222,18 @@ const SelectDialog = forwardRef<DialogDomRef, SelectDialogPropTypes>((props, ref
     setSearchValue('');
   };
 
-  const handleSelectionChange = (e) => {
+  const handleSelectionChange: ListPropTypes['onSelectionChange'] = (e) => {
+    const { selectedItems } = e.detail;
     if (typeof listProps?.onSelectionChange === 'function') {
       listProps.onSelectionChange(e);
     }
     if (selectionMode === ListSelectionMode.Multiple) {
-      setSelectedItems(e.detail.selectedItems);
+      setSelectedItems(selectedItems);
+      if (selectedItems.length) {
+        announce('Selected Items ' + selectedItems.length, InvisibleMessageMode.Polite);
+        //todo: uncomment this, once translations are available
+        // announce(i18nBundle.getText(SELECTED_ITEMS, selectedItems.length), InvisibleMessageMode.Polite);
+      }
     } else {
       if (typeof onConfirm === 'function') {
         onConfirm(e);

packages/main/src/i18n/messagebundle.properties

@@ -378,5 +378,7 @@ HAS_DETAILS=Has Details
 #XACT: Message Item counter label
 COUNTER=Counter
 
+#ACT: Screen reader announcement text for selection in the SelectDialog component when multi-selection mode is active. The placeholder represents a number.
+SELECTED_ITEMS=Selected Items {0}