Mini tutorial code for Creating a component extension

diff --git a/uitest/src/com/vaadin/tests/minitutorials/v7a3/CapsLockWarning.java b/uitest/src/com/vaadin/tests/minitutorials/v7a3/CapsLockWarning.java
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+/*
+ * Copyright 2011 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.minitutorials.v7a3;
+
+import com.vaadin.server.AbstractExtension;
+import com.vaadin.ui.PasswordField;
+
+public class CapsLockWarning extends AbstractExtension {
+    public void extend(PasswordField field) {
+        super.extend(field);
+    }
+}

diff --git a/uitest/src/com/vaadin/tests/minitutorials/v7a3/CapsLockWarningUI.java b/uitest/src/com/vaadin/tests/minitutorials/v7a3/CapsLockWarningUI.java
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+/*
+ * Copyright 2011 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.minitutorials.v7a3;
+
+import com.vaadin.annotations.Widgetset;
+import com.vaadin.server.WrappedRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.tests.widgetset.TestingWidgetSet;
+import com.vaadin.ui.PasswordField;
+
+@Widgetset(TestingWidgetSet.NAME)
+public class CapsLockWarningUI extends AbstractTestUI {
+
+    @Override
+    protected void setup(WrappedRequest request) {
+        PasswordField field = new PasswordField("Enter your password");
+        new CapsLockWarning().extend(field);
+
+        addComponent(field);
+    }
+
+    @Override
+    protected String getTestDescription() {
+        return "Mini tutorial code for https://vaadin.com/wiki/-/wiki/Main/Creating%20a%20component%20extension";
+    }
+
+    @Override
+    protected Integer getTicketNumber() {
+        // TODO Auto-generated method stub
+        return null;
+    }
+
+}

diff --git a/uitest/src/com/vaadin/tests/widgetset/client/minitutorials/v7a3/CapsLockWarningConnector.java b/uitest/src/com/vaadin/tests/widgetset/client/minitutorials/v7a3/CapsLockWarningConnector.java
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+++ b/uitest/src/com/vaadin/tests/widgetset/client/minitutorials/v7a3/CapsLockWarningConnector.java
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+package com.vaadin.tests.widgetset.client.minitutorials.v7a3;
+
+import com.google.gwt.event.dom.client.KeyPressEvent;
+import com.google.gwt.event.dom.client.KeyPressHandler;
+import com.google.gwt.user.client.ui.HTML;
+import com.google.gwt.user.client.ui.Widget;
+import com.vaadin.client.ComponentConnector;
+import com.vaadin.client.ServerConnector;
+import com.vaadin.client.extensions.AbstractExtensionConnector;
+import com.vaadin.client.ui.VOverlay;
+import com.vaadin.shared.ui.Connect;
+import com.vaadin.tests.minitutorials.v7a3.CapsLockWarning;
+
+@Connect(CapsLockWarning.class)
+public class CapsLockWarningConnector extends AbstractExtensionConnector {
+
+    @Override
+    protected void extend(ServerConnector target) {
+        final Widget passwordWidget = ((ComponentConnector) target).getWidget();
+
+        final VOverlay warning = new VOverlay();
+        warning.add(new HTML("Caps Lock is enabled!"));
+
+        passwordWidget.addDomHandler(new KeyPressHandler() {
+            @Override
+            public void onKeyPress(KeyPressEvent event) {
+                if (isEnabled() && isCapsLockOn(event)) {
+                    warning.showRelativeTo(passwordWidget);
+                } else {
+                    warning.hide();
+                }
+            }
+        }, KeyPressEvent.getType());
+    }
+
+    private boolean isCapsLockOn(KeyPressEvent e) {
+        return e.isShiftKeyDown() ^ Character.isUpperCase(e.getCharCode());
+    }
+}
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