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   1 package com.vaadin.tests.widgetset.client.minitutorials.v7b1;
   2
   3 import com.google.gwt.event.dom.client.KeyPressEvent;
   4 import com.google.gwt.event.dom.client.KeyPressHandler;
   5 import com.google.gwt.user.client.ui.HTML;
   6 import com.google.gwt.user.client.ui.Widget;
   7 import com.vaadin.client.ComponentConnector;
   8 import com.vaadin.client.ServerConnector;
   9 import com.vaadin.client.communication.RpcProxy;
  10 import com.vaadin.client.extensions.AbstractExtensionConnector;
  11 import com.vaadin.client.ui.VOverlay;
  12 import com.vaadin.shared.ui.Connect;
  13 import com.vaadin.tests.minitutorials.v7b1.CapsLockWarningWithRpc;
  14
  15 @Connect(CapsLockWarningWithRpc.class)
  16 public class CapsLockWarningWithRpcConnector extends AbstractExtensionConnector {
  17
  18     private CapsLockWarningRpc rpc = RpcProxy.create(CapsLockWarningRpc.class,
  19             this);
  20
  21     @Override
  22     protected void extend(ServerConnector target) {
  23         final Widget passwordWidget = ((ComponentConnector) target).getWidget();
  24
  25         final VOverlay warning = new VOverlay();
  26         warning.setOwner(passwordWidget);
  27         warning.add(new HTML("Caps Lock is enabled!"));
  28
  29         passwordWidget.addDomHandler(new KeyPressHandler() {
  30             @Override
  31             public void onKeyPress(KeyPressEvent event) {
  32                 if (isEnabled() && isCapsLockOn(event)) {
  33                     warning.showRelativeTo(passwordWidget);
  34                     rpc.isCapsLockEnabled(true); // Added to send message to the
  35                                                  // server
  36                 } else {
  37                     warning.hide();
  38                     rpc.isCapsLockEnabled(false); // Added to send message to
  39                                                   // the server
  40                 }
  41             }
  42         }, KeyPressEvent.getType());
  43     }
  44
  45     private boolean isCapsLockOn(KeyPressEvent e) {
  46         return e.isShiftKeyDown() ^ Character.isUpperCase(e.getCharCode());
  47     }
  48 }