refactor: open date picker overlay on element focus in fullscreen (#9670)

Author: DiegoCardoso

packages/date-picker/src/vaadin-date-picker-mixin.js

@@ -496,6 +496,18 @@ export const DatePickerMixin = (subclass) =>
       this.opened = false;
     }
 
+    /**
+     * @protected
+     * @override
+     */
+    focus(options) {
+      if (this._noInput && !isKeyboardActive()) {
+        this.open();
+      } else {
+        super.focus(options);
+      }
+    }
+
     /**
      * Opens the dropdown.
      */

packages/date-picker/test/fullscreen.test.js

@@ -60,6 +60,21 @@ describe('fullscreen mode', () => {
         expect(document.activeElement).to.not.equal(input);
       });
 
+      it('should not focus input element when focusing the date picker', () => {
+        const spy = sinon.spy(input, 'focus');
+        datePicker.focus();
+        expect(spy.called).to.be.false;
+        expect(document.activeElement).to.not.equal(input);
+      });
+
+      it('should focus date element when focusing the date picker', async () => {
+        datePicker.focus();
+        await untilOverlayRendered(datePicker);
+        const cell = getFocusableCell(datePicker);
+        expect(cell).to.be.instanceOf(HTMLTableCellElement);
+        expect(cell.getAttribute('part')).to.include('today');
+      });
+
       it('should not blur input element when focusing it with keyboard', () => {
         const spy = sinon.spy(input, 'blur');
         tabKeyDown(input);
@@ -68,6 +83,14 @@ describe('fullscreen mode', () => {
         expect(document.activeElement).to.equal(input);
       });
 
+      it('should not blur input element when focusing date picker with keyboard', () => {
+        const spy = sinon.spy(input, 'blur');
+        tabKeyDown(input);
+        datePicker.focus();
+        expect(spy.called).to.be.false;
+        expect(document.activeElement).to.equal(input);
+      });
+
       it('should blur input element when opening overlay', async () => {
         const spy = sinon.spy(input, 'blur');
         await open(datePicker);

packages/field-highlighter/src/fields/vaadin-date-picker-observer.js

@@ -3,14 +3,14 @@
  * Copyright (c) 2021 - 2025 Vaadin Ltd.
  * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
  */
+import { isKeyboardActive } from '@vaadin/a11y-base/src/focus-utils.js';
 import { ComponentObserver } from './vaadin-component-observer.js';
 
 export class DatePickerObserver extends ComponentObserver {
   constructor(datePicker) {
     super(datePicker);
 
     this.datePicker = datePicker;
-    this.fullscreenFocus = false;
     this.blurWhileOpened = false;
 
     this.addListeners(datePicker);
@@ -19,14 +19,6 @@ export class DatePickerObserver extends ComponentObserver {
   addListeners(datePicker) {
     this.overlay = datePicker.$.overlay;
 
-    // Fullscreen date picker calls blur() to avoid focusing of the input:
-    // 1. first time when focus event is fired (before opening the overlay),
-    // 2. second time after the overlay is open, see "_onOverlayOpened".
-    // Here we set the flag to ignore related focusout events and then to
-    // mark date picker as being edited by user (to show field highlight).
-    // We have to use capture phase in order to catch this event early.
-    datePicker.addEventListener('blur', (event) => this.onBlur(event), true);
-
     datePicker.addEventListener('opened-changed', (event) => this.onOpenedChanged(event));
 
     this.overlay.addEventListener('focusout', (event) => this.onOverlayFocusOut(event));
@@ -40,11 +32,9 @@ export class DatePickerObserver extends ComponentObserver {
     return this.datePicker._overlayContent && this.datePicker._overlayContent.contains(node);
   }
 
-  onBlur(event) {
+  isFullscreen() {
     const datePicker = this.datePicker;
-    if (datePicker._fullscreen && !this.isEventInOverlay(event.relatedTarget)) {
-      this.fullscreenFocus = true;
-    }
+    return datePicker._noInput && !isKeyboardActive();
   }
 
   onFocusIn(event) {
@@ -63,7 +53,7 @@ export class DatePickerObserver extends ComponentObserver {
   }
 
   onFocusOut(event) {
-    if (this.fullscreenFocus || this.isEventInOverlay(event.relatedTarget)) {
+    if (this.isEventInOverlay(event.relatedTarget)) {
       // Do nothing, overlay is opening.
     } else if (!this.datePicker.opened) {
       // Field blur when closed.
@@ -83,8 +73,7 @@ export class DatePickerObserver extends ComponentObserver {
   }
 
   onOpenedChanged(event) {
-    if (event.detail.value === true && this.fullscreenFocus) {
-      this.fullscreenFocus = false;
+    if (event.detail.value === true && this.isFullscreen()) {
       this.showOutline(this.datePicker);
     }
 

packages/field-highlighter/test/field-components.test.js

@@ -161,11 +161,6 @@ describe('field components', () => {
         field._fullscreen = true;
       });
 
-      it('should not dispatch vaadin-highlight-show event on focus', () => {
-        field.focus();
-        expect(showSpy.callCount).to.equal(0);
-      });
-
       it('should dispatch vaadin-highlight-show event on open', async () => {
         field.focus();
         field.click();