feat: add setAutofocus and isAutofocus API to Popover (#6498)

vaadin-popover-flow-parent/vaadin-popover-flow/src/main/java/com/vaadin/flow/component/popover/Popover.java

@@ -220,6 +220,28 @@ public Optional<String> getAriaLabelledBy() {
                 .ofNullable(getElement().getProperty("accessibleNameRef"));
     }
 
+    /**
+     * Set {@code true} to make the popover content automatically receive focus
+     * after it is opened. Modal popovers use this behavior by default.
+     *
+     * @param autofocus
+     *            the boolean value to set
+     */
+    public void setAutofocus(boolean autofocus) {
+        getElement().setProperty("autofocus", autofocus);
+    }
+
+    /**
+     * Get if the popover content automatically receives focus after it is
+     * opened. Modal popovers use this behavior by default.
+     *
+     * @return {@code true} if the popover content receives focus when opened,
+     *         {@code false} otherwise
+     */
+    public boolean isAutofocus() {
+        return getElement().getProperty("autofocus", false);
+    }
+
     /**
      * Sets the ARIA role for the overlay element, used by screen readers.
      *

vaadin-popover-flow-parent/vaadin-popover-flow/src/test/java/com/vaadin/flow/component/popover/PopoverTest.java

@@ -264,4 +264,15 @@ public void setBackdropVisible_isBackdropVisible() {
         Assert.assertTrue(
                 popover.getElement().getProperty("withBackdrop", false));
     }
+
+    @Test
+    public void setAutofocus_isAutofocus() {
+        Assert.assertFalse(popover.isAutofocus());
+        Assert.assertFalse(
+                popover.getElement().getProperty("autofocus", false));
+
+        popover.setAutofocus(true);
+        Assert.assertTrue(popover.isAutofocus());
+        Assert.assertTrue(popover.getElement().getProperty("autofocus", false));
+    }
 }