Update favicon when changing themes (#15481)

Change-Id: I3622d211ac5e668f7dce999605118f8f16ffae90

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

@@ -887,6 +887,26 @@ public class UIConnector extends AbstractSingleComponentContainerConnector
 
     }
 
+    private void updateVaadinFavicon(String newTheme) {
+        NodeList<Element> iconElements = querySelectorAll("link[rel~=\"icon\"]");
+        for (int i = 0; i < iconElements.getLength(); i++) {
+            Element iconElement = iconElements.getItem(i);
+
+            String href = iconElement.getAttribute("href");
+            if (href != null && href.contains("VAADIN/themes")
+                    && href.endsWith("/favicon.ico")) {
+                href = href.replaceFirst("VAADIN/themes/.+?/favicon.ico",
+                        "VAADIN/themes/" + newTheme + "/favicon.ico");
+                iconElement.setAttribute("href", href);
+            }
+        }
+    }
+
+    private static native NodeList<Element> querySelectorAll(String selector)
+    /*-{
+        return $doc.querySelectorAll(selector);
+    }-*/;
+
     /**
      * Finds a link tag for a style sheet with the given URL
      * 
@@ -979,6 +999,8 @@ public class UIConnector extends AbstractSingleComponentContainerConnector
             getWidget().getParent().addStyleName(newTheme);
             VOverlay.getOverlayContainer(getConnection()).addClassName(
                     activeTheme);
+
+            updateVaadinFavicon(newTheme);
         }
 
         forceStateChangeRecursively(UIConnector.this);

uitest/src/com/vaadin/tests/themes/ThemeChangeFavicon.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.tests.themes;
+
+import java.util.Arrays;
+
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Button.ClickEvent;
+
+public class ThemeChangeFavicon extends AbstractTestUI {
+
+    @Override
+    protected void setup(VaadinRequest request) {
+        for (final String theme : Arrays.asList("valo", "reindeer")) {
+            addComponent(new Button(theme, new Button.ClickListener() {
+                @Override
+                public void buttonClick(ClickEvent event) {
+                    setTheme(theme);
+                }
+            }));
+        }
+    }
+
+    @Override
+    public String getDescription() {
+        return "UI for testing that the favicon changes when changing themes";
+    }
+
+}

uitest/src/com/vaadin/tests/themes/ThemeChangeFaviconTest.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright 2000-2014 Vaadin Ltd.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ * 
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.vaadin.tests.themes;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.openqa.selenium.By;
+import org.openqa.selenium.WebDriver;
+import org.openqa.selenium.WebElement;
+import org.openqa.selenium.remote.DesiredCapabilities;
+import org.openqa.selenium.support.ui.ExpectedCondition;
+
+import com.vaadin.testbench.elements.ButtonElement;
+import com.vaadin.testbench.parallel.Browser;
+import com.vaadin.tests.tb3.SingleBrowserTest;
+
+public class ThemeChangeFaviconTest extends SingleBrowserTest {
+
+    @Override
+    public List<DesiredCapabilities> getBrowsersToTest() {
+        // Seems like stylesheet onload is not fired on PhantomJS
+        // https://github.com/ariya/phantomjs/issues/12332
+        return Collections.singletonList(Browser.FIREFOX
+                .getDesiredCapabilities());
+    }
+
+    @Test
+    public void changeFavicon() throws InterruptedException {
+        setDebug(true);
+        openTestURL();
+        assertFavicon("reindeer");
+
+        changeTheme("valo");
+        assertFavicon("valo");
+
+        changeTheme("reindeer");
+        assertFavicon("reindeer");
+    }
+
+    private void changeTheme(final String theme) {
+        $(ButtonElement.class).caption(theme).first().click();
+
+        final WebElement rootDiv = findElement(By
+                .xpath("//div[contains(@class,'v-app')]"));
+        waitUntil(new ExpectedCondition<Boolean>() {
+
+            @Override
+            public Boolean apply(WebDriver input) {
+                String rootClass = rootDiv.getAttribute("class").trim();
+
+                return rootClass.contains(theme);
+            }
+        }, 30);
+    }
+
+    private void assertFavicon(String theme) {
+        String faviconUrl = "/VAADIN/themes/" + theme + "/favicon.ico";
+
+        List<WebElement> elements = findElements(By
+                .cssSelector("link[rel~=\"icon\"]"));
+
+        Assert.assertEquals(2, elements.size());
+
+        for (WebElement element : elements) {
+            Assert.assertTrue(element.getAttribute("href")
+                    + " does not end with " + faviconUrl,
+                    element.getAttribute("href").endsWith(faviconUrl));
+        }
+    }
+
+}