Fix/focus inside window chrome (#11142)

Fixes #11087

client/src/main/java/com/vaadin/client/ui/ui/UIConnector.java

@@ -15,16 +15,6 @@
  */
 package com.vaadin.client.ui.ui;
 
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.logging.Logger;
-
 import com.google.gwt.core.client.Scheduler;
 import com.google.gwt.dom.client.Document;
 import com.google.gwt.dom.client.Element;
@@ -101,9 +91,18 @@ import com.vaadin.shared.ui.ui.UIServerRpc;
 import com.vaadin.shared.ui.ui.UIState;
 import com.vaadin.shared.util.SharedUtil;
 import com.vaadin.ui.UI;
-
 import elemental.client.Browser;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Logger;
+
 @Connect(value = UI.class, loadStyle = LoadStyle.EAGER)
 public class UIConnector extends AbstractSingleComponentContainerConnector
         implements Paintable, MayScrollChildren {
@@ -375,34 +374,18 @@ public class UIConnector extends AbstractSingleComponentContainerConnector
         if (uidl.hasAttribute("focused")) {
             // set focused component when render phase is finished
             Scheduler.get().scheduleDeferred(() -> {
-                ComponentConnector connector = (ComponentConnector) uidl
-                        .getPaintableAttribute("focused", getConnection());
+                Timer timer = new Timer() {
+                    @Override
+                    public void run() {
+                        ComponentConnector connector = (ComponentConnector) uidl
+                                .getPaintableAttribute("focused",
+                                        getConnection());
 
-                if (connector == null) {
-                    // Do not try to focus invisible components which not
-                    // present in UIDL
-                    return;
-                }
+                        focus(connector);
+                    }
+                };
 
-                final Widget toBeFocused = connector.getWidget();
-                /*
-                 * Two types of Widgets can be focused, either implementing GWT
-                 * Focusable of a thinner Vaadin specific Focusable interface.
-                 */
-                if (toBeFocused instanceof com.google.gwt.user.client.ui.Focusable) {
-                    final com.google.gwt.user.client.ui.Focusable toBeFocusedWidget = (com.google.gwt.user.client.ui.Focusable) toBeFocused;
-                    toBeFocusedWidget.setFocus(true);
-                } else if (toBeFocused instanceof Focusable) {
-                    ((Focusable) toBeFocused).focus();
-                } else {
-                    getLogger().severe(
-                            "Server is trying to set focus to the widget of connector "
-                                    + Util.getConnectorString(connector)
-                                    + " but it is not focusable. The widget should implement either "
-                                    + com.google.gwt.user.client.ui.Focusable.class
-                                            .getName()
-                                    + " or " + Focusable.class.getName());
-                }
+                timer.schedule(0);
             });
         }
 
@@ -437,6 +420,34 @@ public class UIConnector extends AbstractSingleComponentContainerConnector
         }
     }
 
+    private void focus(ComponentConnector connector) {
+        if (connector == null) {
+            // Do not try to focus invisible components which not
+            // present in UIDL
+            return;
+        }
+
+        final Widget toBeFocused = connector.getWidget();
+        /*
+         * Two types of Widgets can be focused, either implementing GWT
+         * Focusable of a thinner Vaadin specific Focusable interface.
+         */
+        if (toBeFocused instanceof com.google.gwt.user.client.ui.Focusable) {
+            final com.google.gwt.user.client.ui.Focusable toBeFocusedWidget = (com.google.gwt.user.client.ui.Focusable) toBeFocused;
+            toBeFocusedWidget.setFocus(true);
+        } else if (toBeFocused instanceof Focusable) {
+            ((Focusable) toBeFocused).focus();
+        } else {
+            getLogger().severe(
+                    "Server is trying to set focus to the widget of connector "
+                            + Util.getConnectorString(connector)
+                            + " but it is not focusable. The widget should implement either "
+                            + com.google.gwt.user.client.ui.Focusable.class
+                                    .getName()
+                            + " or " + Focusable.class.getName());
+        }
+    }
+
     /**
      * Reads CSS strings and resources injected by {@link Styles#inject} from
      * the UIDL stream.

uitest/src/main/java/com/vaadin/tests/components/window/InitialFocus.java

@@ -0,0 +1,74 @@
+package com.vaadin.tests.components.window;
+
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.ComboBox;
+import com.vaadin.ui.TextField;
+import com.vaadin.ui.VerticalLayout;
+import com.vaadin.ui.Window;
+
+public class InitialFocus extends AbstractTestUI {
+
+    public static final String FOCUS_NAME_BUTTON_ID = "focusNameButton";
+    public static final String FOCUS_GENDER_BUTTON_ID = "focusGenderButton";
+    public static final String NAME_FIELD_ID = "nameField";
+    public static final String GENDER_FIELD_ID = "genderField";
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        Button focusNameButton = new Button("Open Window and focus Name");
+        focusNameButton.setId(FOCUS_NAME_BUTTON_ID);
+        focusNameButton.addClickListener(event -> {
+            MyDialog myDialog = new MyDialog();
+            myDialog.setClosable(true);
+            myDialog.center();
+            getUI().addWindow(myDialog);
+            myDialog.bringToFront();
+            myDialog.focusNameField();
+        });
+        addComponent(focusNameButton);
+
+        Button focusGenderButton = new Button("Open Window and focus Gender");
+        focusGenderButton.setId(FOCUS_GENDER_BUTTON_ID);
+        focusGenderButton.addClickListener(event -> {
+            MyDialog myDialog = new MyDialog();
+            myDialog.setClosable(true);
+            myDialog.center();
+            getUI().addWindow(myDialog);
+            myDialog.bringToFront();
+            myDialog.focusGenderField();
+        });
+        addComponent(focusGenderButton);
+    }
+
+    private static class MyDialog extends Window {
+        private TextField nameField;
+        private ComboBox genderField;
+
+        private MyDialog() {
+            super("MyDialog");
+            setWidth("400px");
+            setHeight("300px");
+            VerticalLayout hl = new VerticalLayout();
+            hl.setSizeFull();
+            nameField = new TextField("Name");
+            nameField.setId(NAME_FIELD_ID);
+            hl.addComponent(this.nameField);
+
+            genderField = new ComboBox("Gender");
+            genderField.setId(GENDER_FIELD_ID);
+            hl.addComponentsAndExpand(genderField);
+
+            this.setContent(hl);
+        }
+
+        private void focusNameField() {
+            nameField.focus();
+        }
+
+        private void focusGenderField() {
+            genderField.focus();
+        }
+    }
+}

uitest/src/test/java/com/vaadin/tests/components/window/InitialFocusTest.java

@@ -0,0 +1,54 @@
+package com.vaadin.tests.components.window;
+
+import com.vaadin.testbench.elements.ComboBoxElement;
+import com.vaadin.tests.tb3.MultiBrowserTest;
+import org.junit.Assert;
+import org.junit.Test;
+import org.openqa.selenium.By;
+import org.openqa.selenium.WebElement;
+
+public class InitialFocusTest extends MultiBrowserTest {
+    /**
+     * To test an implementation of
+     * {@code com.google.gwt.user.client.ui.Focusable} which is nameField of
+     * TextField type
+     */
+    @Test
+    public void window_callingFocusNameField_nameFieldShouldGetFocused() {
+        openTestURL();
+        WebElement openWindowButton = findElement(
+                By.id(InitialFocus.FOCUS_NAME_BUTTON_ID));
+        openWindowButton.click();
+        waitForElementPresent(By.id(InitialFocus.NAME_FIELD_ID));
+        WebElement focusedElement = getFocusedElement();
+        Assert.assertNotNull(
+                "Name TextField should have focus while focusedElement is null.",
+                focusedElement);
+        String focusedElementId = focusedElement.getAttribute("id");
+        Assert.assertEquals(
+                "Name TextField should have focus while " + focusedElementId
+                        + " has focus.",
+                InitialFocus.NAME_FIELD_ID, focusedElementId);
+    }
+
+    /**
+     * To test an implementation of {@code com.vaadin.client.Focusable} which is
+     * genderField of ComboBox type
+     */
+    @Test
+    public void window_callingFocusGenderField_genderFieldShouldGetFocused() {
+        openTestURL();
+        WebElement openWindowButton = findElement(
+                By.id(InitialFocus.FOCUS_GENDER_BUTTON_ID));
+        openWindowButton.click();
+        waitForElementPresent(By.id(InitialFocus.GENDER_FIELD_ID));
+        WebElement focusedElement = getFocusedElement();
+        Assert.assertNotNull(
+                "Gender ComboBox should have focus while focusedElement is null.",
+                focusedElement);
+        ComboBoxElement genderField = $(ComboBoxElement.class).first();
+        Assert.assertEquals(
+                "Gender ComboBox should have focus while another element has focus.",
+                genderField.getInputField(), focusedElement);
+    }
+}