Use Enter and Space keys to fire Window header buttons (#11517) (#11534)

* Fixes 11517. Use ENTER and SPACE keys as shortcuts for header buttons

* Merge branch 'master' into fix-11517

* Increase sleep time for test failing in validation

* Merge branch 'master' into fix-11517

4 files changed, 474 insertions, 5 deletions

diff --git a/client/src/main/java/com/vaadin/client/ui/VWindow.java b/client/src/main/java/com/vaadin/client/ui/VWindow.java
index f7fc2ba6b8..e19a13c005 100644
--- a/client/src/main/java/com/vaadin/client/ui/VWindow.java
+++ b/client/src/main/java/com/vaadin/client/ui/VWindow.java
@@ -434,7 +434,7 @@ public class VWindow extends VOverlay implements ShortcutActionHandlerOwner,
         DOM.appendChild(super.getContainerElement(), wrapper);
 
         sinkEvents(Event.ONDBLCLICK | Event.MOUSEEVENTS | Event.TOUCHEVENTS
-                | Event.ONCLICK | Event.ONLOSECAPTURE);
+                | Event.ONCLICK | Event.ONLOSECAPTURE | Event.ONKEYUP);
 
         setWidget(contentPanel);
 
@@ -1008,18 +1008,21 @@ public class VWindow extends VOverlay implements ShortcutActionHandlerOwner,
         final int type = event.getTypeInt();
 
         final Element target = DOM.eventGetTarget(event);
-
         if (resizing || resizeBox == target) {
             onResizeEvent(event);
             bubble = false;
+            // if clicked or key ENTER or SPACE is pressed
         } else if (isClosable() && target == closeBox) {
-            if (type == Event.ONCLICK) {
+            if (type == Event.ONCLICK || (type == Event.ONKEYUP
+                    && isKeyEnterOrSpace(event.getKeyCode()))) {
                 onCloseClick();
             }
             bubble = false;
         } else if (target == maximizeRestoreBox) {
             // handled in connector
-            if (type != Event.ONCLICK) {
+            // if clicked or key ENTER or SPACE is pressed
+            if (type != Event.ONCLICK && !(type == Event.ONKEYUP
+                    && isKeyEnterOrSpace(event.getKeyCode()))) {
                 bubble = false;
             }
         } else if (header.isOrHasChild(target) && !dragging) {
@@ -1571,4 +1574,8 @@ public class VWindow extends VOverlay implements ShortcutActionHandlerOwner,
         return Document.get().getBody()
                 .hasClassName(MODAL_WINDOW_OPEN_CLASSNAME);
     }
+
+    private boolean isKeyEnterOrSpace(int keyCode) {
+        return keyCode == KeyCodes.KEY_ENTER || keyCode == KeyCodes.KEY_SPACE;
+    }
 }
diff --git a/client/src/main/java/com/vaadin/client/ui/window/WindowConnector.java b/client/src/main/java/com/vaadin/client/ui/window/WindowConnector.java
index feb34e502e..12ce828f47 100644
--- a/client/src/main/java/com/vaadin/client/ui/window/WindowConnector.java
+++ b/client/src/main/java/com/vaadin/client/ui/window/WindowConnector.java
@@ -29,6 +29,9 @@ import com.google.gwt.event.dom.client.ClickEvent;
 import com.google.gwt.event.dom.client.ClickHandler;
 import com.google.gwt.event.dom.client.DoubleClickEvent;
 import com.google.gwt.event.dom.client.DoubleClickHandler;
+import com.google.gwt.event.dom.client.KeyCodes;
+import com.google.gwt.event.dom.client.KeyUpEvent;
+import com.google.gwt.event.dom.client.KeyUpHandler;
 import com.google.gwt.user.client.DOM;
 import com.google.gwt.user.client.Window;
 import com.vaadin.client.ApplicationConnection;
@@ -67,7 +70,7 @@ public class WindowConnector extends AbstractSingleComponentContainerConnector
     };
 
     abstract class WindowEventHandler
-            implements ClickHandler, DoubleClickHandler {
+            implements ClickHandler, DoubleClickHandler, KeyUpHandler {
     }
 
     private WindowEventHandler maximizeRestoreClickHandler = new WindowEventHandler() {
@@ -91,6 +94,18 @@ public class WindowConnector extends AbstractSingleComponentContainerConnector
                 onMaximizeRestore();
             }
         }
+
+        @Override
+        public void onKeyUp(KeyUpEvent event) {
+            final int keyCode = event.getNativeKeyCode();
+            final Element target = event.getNativeEvent().getEventTarget()
+                    .cast();
+            // key ENTER or SPACE on maximize/restore box
+            if (target == getWidget().maximizeRestoreBox
+                    && isKeyEnterOrSpace(keyCode)) {
+                onMaximizeRestore();
+            }
+        }
     };
 
     @Override
@@ -115,6 +130,7 @@ public class WindowConnector extends AbstractSingleComponentContainerConnector
         window.addHandler(maximizeRestoreClickHandler, ClickEvent.getType());
         window.addHandler(maximizeRestoreClickHandler,
                 DoubleClickEvent.getType());
+        window.addHandler(maximizeRestoreClickHandler, KeyUpEvent.getType());
 
         window.setOwner(getConnection().getUIConnector().getWidget());
 
@@ -511,4 +527,8 @@ public class WindowConnector extends AbstractSingleComponentContainerConnector
         getRpcProxy(WindowServerRpc.class).windowMoved(event.getNewX(),
                 event.getNewY());
     }
+
+    private boolean isKeyEnterOrSpace(int keyCode) {
+        return keyCode == KeyCodes.KEY_ENTER || keyCode == KeyCodes.KEY_SPACE;
+    }
 }
diff --git a/uitest/src/main/java/com/vaadin/tests/components/window/WindowHeaderButtonKeyboardActions.java b/uitest/src/main/java/com/vaadin/tests/components/window/WindowHeaderButtonKeyboardActions.java
new file mode 100644
index 0000000000..4b5dc6de48
--- /dev/null
+++ b/uitest/src/main/java/com/vaadin/tests/components/window/WindowHeaderButtonKeyboardActions.java
@@ -0,0 +1,37 @@
+package com.vaadin.tests.components.window;
+
+import com.vaadin.annotations.Widgetset;
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.Window;
+
+@Widgetset("com.vaadin.DefaultWidgetSet")
+public class WindowHeaderButtonKeyboardActions extends AbstractTestUI {
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        Button button = new Button("Open window");
+        button.setId("firstButton");
+
+        button.addClickListener(new Button.ClickListener() {
+            public void buttonClick(Button.ClickEvent event) {
+                Window window = new Window("WINDOW");
+                window.setContent(new Label("Inside window"));
+                window.setHeight("100px");
+                window.setId("testWindow");
+                window.addCloseListener(new Window.CloseListener() {
+                    @Override
+                    public void windowClose(Window.CloseEvent e) {
+
+                    }
+                });
+                addWindow(window);
+            }
+        });
+        addComponent(button);
+
+    }
+
+}
diff --git a/uitest/src/test/java/com/vaadin/tests/components/window/WindowHeaderButtonKeyboardActionsTest.java b/uitest/src/test/java/com/vaadin/tests/components/window/WindowHeaderButtonKeyboardActionsTest.java
new file mode 100644
index 0000000000..47ac64107d
--- /dev/null
+++ b/uitest/src/test/java/com/vaadin/tests/components/window/WindowHeaderButtonKeyboardActionsTest.java
@@ -0,0 +1,405 @@
+package com.vaadin.tests.components.window;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.openqa.selenium.JavascriptExecutor;
+import org.openqa.selenium.Keys;
+import org.openqa.selenium.WebElement;
+import org.openqa.selenium.interactions.Actions;
+
+import com.vaadin.testbench.By;
+import com.vaadin.testbench.elements.WindowElement;
+import com.vaadin.tests.tb3.MultiBrowserTest;
+
+public class WindowHeaderButtonKeyboardActionsTest extends MultiBrowserTest {
+
+    private static final String HEADER_CLASS = "v-window-header";
+    private static final String RESTORE_BOX_CLASS = "v-window-restorebox";
+    private static final String MAXIMIZE_BOX_CLASS = "v-window-maximizebox";
+    private static final String CLOSE_BOX_CLASS = "v-window-closebox";
+
+    @Override
+    public void setup() throws Exception {
+        super.setup();
+        openTestURL();
+
+        // open window before each test case
+        waitForElementPresent(By.id("firstButton"));
+        WebElement button = findElement(By.id("firstButton"));
+        button.click();
+
+        waitForElementPresent(By.id("testWindow"));
+    }
+
+    /**
+     * Scenario: focus the close button of the opened window -> press ENTER key
+     * -> window should be closed
+     */
+    @Test
+    public void testCloseWindowWithEnter() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement closeButton = windowElement
+                .findElement(By.className(CLOSE_BOX_CLASS));
+        setFocusToElementAndWait(closeButton);
+
+        assertTrue("Window's close button is not the focused element",
+                closeButton.equals(driver.switchTo().activeElement()));
+
+        pressKeyAndWait(Keys.ENTER);
+        assertTrue("Window is not closed",
+                findElements(By.className("v-window")).size() == 0);
+    }
+
+    /**
+     * Scenario: focus the close button of the opened window -> press SPACE key
+     * -> window should be closed
+     */
+    @Test
+    public void testCloseWindowWithSpace() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement closeButton = windowElement
+                .findElement(By.className(CLOSE_BOX_CLASS));
+        setFocusToElementAndWait(closeButton);
+
+        assertTrue("Window's close button is not the focused element",
+                closeButton.equals(driver.switchTo().activeElement()));
+        pressKeyAndWait(Keys.SPACE);
+
+        assertTrue("Window is not closed",
+                findElements(By.className("v-window")).size() == 0);
+    }
+
+    /**
+     * Scenario: focus close button of opened window -> press keys DELETE,
+     * ARROW_LEFT, and END -> window should remain open after all actions
+     */
+    @Test
+    public void testIncorrectKeyInputDoesntFireClose() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement closeButton = windowElement
+                .findElement(By.className(CLOSE_BOX_CLASS));
+        setFocusToElementAndWait(closeButton);
+
+        assertTrue("Window's close button is not the focused element",
+                closeButton.equals(driver.switchTo().activeElement()));
+
+        pressKeyAndWait(Keys.DELETE);
+        assertTrue(
+                "Window is closed by DELETE when close button is the focused element",
+                findElements(By.className("v-window")).size() > 0);
+
+        pressKeyAndWait(Keys.ARROW_LEFT);
+        assertTrue(
+                "Window is closed by ARROW_LEFT when close button is the focused element",
+                findElements(By.className("v-window")).size() > 0);
+
+        pressKeyAndWait(Keys.END);
+        assertTrue(
+                "Window is closed by END when close button is the focused element",
+                findElements(By.className("v-window")).size() > 0);
+    }
+
+    /**
+     * Scenario: close button of opened window is not focused -> press keys
+     * ENTER and SPACE -> window should remain open after all actions
+     */
+    @Test
+    public void testNonfocusedKeyDoesntCloseWindow() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement closeButton = windowElement
+                .findElement(By.className(CLOSE_BOX_CLASS));
+        assertTrue("Window's close button is the focused element",
+                !closeButton.equals(driver.switchTo().activeElement()));
+
+        pressKeyAndWait(Keys.ENTER);
+        assertTrue(
+                "Window is closed by ENTER when close button is not the focused element",
+                findElements(By.className("v-window")).size() > 0);
+
+        pressKeyAndWait(Keys.SPACE);
+        assertTrue(
+                "Window is closed by SPACE when close button is not the focused element",
+                findElements(By.className("v-window")).size() > 0);
+    }
+
+    /**
+     * Scenario: focus close button of opened window -> press keys TAB, and
+     * TAB+SHIFT in succession, shifting focus from and back to the button ->
+     * press ENTER key -> window should be closed
+     */
+    @Test
+    public void testShiftFocusAndCloseWindow() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement closeButton = windowElement
+                .findElement(By.className(CLOSE_BOX_CLASS));
+        setFocusToElementAndWait(closeButton);
+        assertTrue("Window's close button is not the focused element",
+                closeButton.equals(driver.switchTo().activeElement()));
+
+        pressKeyAndWait(Keys.TAB);
+        assertTrue("Window's close button is the focused element",
+                !closeButton.equals(driver.switchTo().activeElement()));
+        pressKeyAndWait(Keys.SHIFT, Keys.TAB);
+        assertTrue("Window's close button is not the focused element",
+                closeButton.equals(driver.switchTo().activeElement()));
+
+        pressKeyAndWait(Keys.ENTER);
+        assertTrue(
+                "Window is not closed when focus is shifted back-and-forth",
+                findElements(By.className("v-window")).size() == 0);
+    }
+
+    /**
+     * Scenario: focus close button of opened window -> click close button with
+     * the mouse cursor -> window should be closed
+     */
+    @Test
+    public void testMouseClickClosesWindowOnFocus() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement closeButton = windowElement
+                .findElement(By.className(CLOSE_BOX_CLASS));
+        setFocusToElementAndWait(closeButton);
+        assertTrue("Window's close button is not the focused element",
+                closeButton.equals(driver.switchTo().activeElement()));
+
+        // click button with mouse and wait
+        closeButton.click();
+        sleep(200);
+
+        assertTrue("Window is not closed when focused element is clicked",
+                findElements(By.className("v-window")).size() == 0);
+    }
+
+    // Tests for maximize-restore button
+
+    /**
+     * Scenario: focus the maximize button of the opened window -> press ENTER
+     * key -> window should be maximized
+     */
+    @Test
+    public void testMaximizeWindowWithEnter() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement closeButton = windowElement
+                .findElement(By.className(MAXIMIZE_BOX_CLASS));
+        setFocusToElementAndWait(closeButton);
+
+        assertTrue("Window's maximize button is not the focused element",
+                closeButton.equals(driver.switchTo().activeElement()));
+        pressKeyAndWait(Keys.ENTER);
+
+        assertTrue("Window is not maximized", windowElement.isMaximized());
+    }
+
+    /**
+     * Scenario: focus the maximize button of the opened window -> press SPACE
+     * key -> window should be maximized
+     */
+    @Test
+    public void testMaximizeWindowWithSpace() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement closeButton = windowElement
+                .findElement(By.className(MAXIMIZE_BOX_CLASS));
+        setFocusToElementAndWait(closeButton);
+
+        assertTrue("Window's maximize button is not the focused element",
+                closeButton.equals(driver.switchTo().activeElement()));
+        pressKeyAndWait(Keys.SPACE);
+
+        assertTrue("Window is not maximized", windowElement.isMaximized());
+    }
+
+    /**
+     * Scenario: focus maximize button of opened window -> press keys DELETE,
+     * ARROW_UP, and ADD -> window should remain open after all actions
+     */
+    @Test
+    public void testIncorrectKeyInputDoesntFireMaximize() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement maximizeButton = windowElement
+                .findElement(By.className(MAXIMIZE_BOX_CLASS));
+        setFocusToElementAndWait(maximizeButton);
+
+        assertTrue("Window's maximize button is not the focused element",
+                maximizeButton.equals(driver.switchTo().activeElement()));
+
+        pressKeyAndWait(Keys.DELETE);
+        assertTrue(
+                "Window is maximized by DELETE when maximize button is the focused element",
+                !windowElement.isMaximized());
+
+        pressKeyAndWait(Keys.ARROW_UP);
+        assertTrue(
+                "Window is cmaximized by ARROW_UP when maximize button is the focused element",
+                !windowElement.isMaximized());
+
+        pressKeyAndWait(Keys.ADD);
+        assertTrue(
+                "Window is maximized by ADD when maximize button is the focused element",
+                !windowElement.isMaximized());
+    }
+
+    /**
+     * Scenario: close button of opened window is not focused -> press keys
+     * ENTER and SPACE -> window should remain non-maximized after all actions
+     */
+    @Test
+    public void testNonfocusedKeyDoesntMaximizeWindow() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement maximizeButton = windowElement
+                .findElement(By.className(MAXIMIZE_BOX_CLASS));
+        assertTrue("Window's close button is the focused element",
+                !maximizeButton.equals(driver.switchTo().activeElement()));
+
+        pressKeyAndWait(Keys.ENTER);
+        assertTrue(
+                "Window is maximized by ENTER when maximize button is not the focused element",
+                !windowElement.isMaximized());
+
+        pressKeyAndWait(Keys.SPACE);
+        assertTrue(
+                "Window is maximized by SPACE when maximize button is not the focused element",
+                !windowElement.isMaximized());
+    }
+
+    /**
+     * Scenario: focus maximize button of opened window -> press keys TAB, and
+     * TAB+SHIFT in succession, shifting focus from and back to the button ->
+     * press ENTER key -> window should be maximized
+     */
+    @Test
+    public void testShiftFocusAndMaximizeWindow() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement maximizeButton = windowElement
+                .findElement(By.className(MAXIMIZE_BOX_CLASS));
+        setFocusToElementAndWait(maximizeButton);
+        assertTrue("Window's maximize button is not the focused element",
+                maximizeButton.equals(driver.switchTo().activeElement()));
+
+        pressKeyAndWait(Keys.TAB);
+        assertTrue("Window's maximize button is the focused element",
+                !maximizeButton.equals(driver.switchTo().activeElement()));
+        pressKeyAndWait(Keys.SHIFT, Keys.TAB);
+        assertTrue("Window's maximize button is not the focused element",
+                maximizeButton.equals(driver.switchTo().activeElement()));
+
+        pressKeyAndWait(Keys.ENTER);
+        assertTrue(
+                "Window is not maximized when focus is shifted back-and-forth",
+                windowElement.isMaximized());
+    }
+
+    /**
+     * Scenario: focus maximize button of opened window -> click maximize button
+     * with mouse cursor -> window should be maximized
+     */
+    @Test
+    public void testMouseClickMaximizesWindowOnFocus() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement maximizeButton = windowElement
+                .findElement(By.className(MAXIMIZE_BOX_CLASS));
+        setFocusToElementAndWait(maximizeButton);
+        assertTrue("Window's maximize button is not the focused element",
+                maximizeButton.equals(driver.switchTo().activeElement()));
+
+        // click button with mouse and wait
+        maximizeButton.click();
+        sleep(100);
+
+        assertTrue("Window is not maximized when focused element is clicked",
+                windowElement.isMaximized());
+    }
+
+    /**
+     * Scenario: focus the maximize button of the opened window -> press ENTER
+     * key -> window should be maximized -> press ENTER key again -> window
+     * should be restored
+     */
+    @Test
+    public void testMaximizeAndRestoreWindowWithEnter() throws IOException {
+
+        assertTrue("Window is not open",
+                findElements(By.id("testWindow")).size() == 1);
+
+        WindowElement windowElement = $(WindowElement.class).first();
+        WebElement closeButton = windowElement
+                .findElement(By.className(MAXIMIZE_BOX_CLASS));
+        setFocusToElementAndWait(closeButton);
+
+        assertTrue("Window's maximize button is not the focused element",
+                closeButton.equals(driver.switchTo().activeElement()));
+        pressKeyAndWait(Keys.ENTER);
+
+        assertTrue("Window is not maximized", windowElement.isMaximized());
+
+        assertTrue("Window's maximize button is not the focused element",
+                closeButton.equals(driver.switchTo().activeElement()));
+        pressKeyAndWait(Keys.ENTER);
+
+        assertTrue("Window remains maximized", !windowElement.isMaximized());
+    }
+
+    protected void setFocusToElementAndWait(WebElement element) {
+        String elementId = element.getAttribute("id");
+
+        ((JavascriptExecutor) getDriver()).executeScript(
+                "document.getElementById('" + elementId + "').focus();",
+                element);
+        sleep(100);
+    }
+
+    protected void pressKeyAndWait(Keys... key) {
+        new Actions(driver).sendKeys(key).build().perform();
+        sleep(100);
+    }
+}