我对Vaadin中的ServerRpc实现有一个问题,我在eclipse中有一个带有小部件集的简单示例项目:
以下是课程:
小工具包.MarqueeLabel:
public class MarqueeLabel extends AbstractComponent {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
public MarqueeLabelState getState() {
return (MarqueeLabelState) super.getState();
}
@Override
public void setCaption(String caption) {
getState().text = caption;
}
}
小工具包。小工具:
public class WidgetUI extends UI {
@WebServlet(value = "/*", asyncSupported = true)
@VaadinServletConfiguration(productionMode = false, ui = WidgetUI.class, widgetset = "widgetpackage.widgetWidgetset")
public static class Servlet extends VaadinServlet {
}
@Override
protected void init(VaadinRequest request) {
final VerticalLayout layout = new VerticalLayout();
layout.setMargin(true);
setContent(layout);
MarqueeLabel label = new MarqueeLabel();
label.setCaption("Hello I am custom widget!");
layout.addComponent(label);
}
}
widgetpackage.client.MarqeLabelWidget:
public class MarqueeLabelWidget extends Label {
public MarqueeLabelWidget() {
final Element el = getElement();
el.getStyle().setPosition(Position.RELATIVE);
Timer timer = new Timer() {
private int left = 0;
@Override
public void run() {
el.getStyle().setLeft(left, Unit.PX);
left++;
}
};
timer.scheduleRepeating(100);
}
}
widgetpackage.client.MarqueeLabelState:
public class MarqueeLabelState extends AbstractComponentState {
/**
*
*/
private static final long serialVersionUID = 1L;
public String text;
}
widgetpackage.client.MarkleLabelConnector(小部件包客户端标记标签连接器):
@Connect(MarqueeLabel.class)
public class MarqueeLabelConnector extends AbstractComponentConnector {
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
public Widget createWidget() {
return GWT.create(MarqueeLabelWidget.class);
}
@Override
public MarqueeLabelWidget getWidget() {
return (MarqueeLabelWidget) super.getWidget();
}
@Override
public MarqueeLabelState getState() {
return (MarqueeLabelState) super.getState();
}
@Override
public void onStateChanged(StateChangeEvent e) {
super.onStateChanged(e);
getWidget().setText(getState().text);
}
}
WidgetWidgetset.gwt.xml位于widgetpackage包中:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 1.7.0//EN" "http://google-web-toolkit.googlecode.com/svn/tags/1.7.0/distro-source/core/src/gwt-module.dtd">
<module>
<inherits name="com.vaadin.DefaultWidgetSet" />
</module>
当我构建小部件集和“在服务器上运行”时,一切都正常,但当我添加这个ServerRpc实现时,如下所示:
1) 添加widgetpackage.MarqueeLabelServerRpc接口(widgetpackage,MarqueeLabel服务器组件所在的位置):
public interface MarqueeLabelServerRpc extends ServerRpc {
public void clicked();
}
2) 将此行添加到widgetpackage.client.MarkeLabelConnect:
public class MarqueeLabelConnector extends AbstractComponentConnector {
private MarqueeLabelServerRpc rpc = RpcProxy.create(
MarqueeLabelServerRpc.class, this);
public MarqueeLabelConnector() {
getWidget().addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
rpc.clicked(); // server's call
}
});
}
// ...
}
3) 将此构造函数添加到widgetpackage.MarqueeLabel:
公共类MarqueeLabel扩展了AbstractComponent{
public MarqueeLabel() {
registerRpc(new MarqueeLabelServerRpc() {
@Override
public void clicked() {
Notification.show("Made a RPCâ);
}
});
}
// ...
}
如果我重新编译小部件集并运行项目,我会在浏览器中看到:
Widgetset“widgetpackage.widgetWidgetset”不包含
“widgetpackage.MarkeLabel”的实现。检查其组件
连接器的@Connect映射、小部件集GWT模块描述文件
并重新编译小部件集。如果你下载了vaadin
附加组件包,您可能需要参考附加组件说明。
为什么当我添加RPC实现时,小部件集再也找不到MarqueeLabel的实现了?
