9. GWT: Build your first app final Label resultaatLabel = new Label(); final TextBox aBox= new TextBox(); final TextBox bBox= new TextBox(); final Button button = new Button("Click me"); button.addClickListener( new ClickListener() { public void onClick(Widget sender) { resultaatLabel.setText("hier komt het resultaat"); } }); RootPanel. get ("inputboxa").add(aBox); RootPanel. get ("inputboxb").add(bBox); RootPanel. get ("resultaat").add(resultaatLabel); RootPanel. get ("bereken").add(button); GWT Widgets Bind to HTML page
10. GWT: project structure Client-side source files and subpackages com/mycompany/client/ The project root package contains module XML files com/mycompany/ Server-side code and subpackages com/mycompany/server/ Static resources that can be served publicly com/mycompany/public/ Purpose Package
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12. GWT: module example com/mycompany/public/MyApplication.html com/mycompany/MyApplication.gwt.xml com/mycompany/client/MyApplication.java
20. RPC plumbing diagram package com.mycompany.client; import com.google.gwt.user.client.rpc.RemoteService; public interface MyAddService extends RemoteService { public int add(int a, int b); }
21. RPC plumbing diagram package com.mycompany.server; import com.google.gwt.user.server.rpc.RemoteServiceServlet; import com.mycompany.client.MyAddService; public class MyAddServiceImpl extends RemoteServiceServlet implements MyAddService{ public int add(int a, int b) { int z = a + b; return z; } }
22. RPC plumbing diagram package com.mycompany.client; import com.google.gwt.user.client.rpc.AsyncCallback; public interface MyAddServiceAsync { public void add(int a, int b, AsyncCallback callback); }
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24. Actually making a call button.addClickListener( new ClickListener() { public void onClick(Widget sender) { MyAddServiceAsync addService = (MyAddServiceAsync) GWT.create(MyAddService.class); ServiceDefTarget endpoint = (ServiceDefTarget) addService; String moduleRelativeURL = GWT.getModuleBaseURL() + "addService“; endpoint.setServiceEntryPoint(moduleRelativeURL); AsyncCallback callback = new AsyncCallback(){ public void onSuccess(Object result){ resultaatLabel.setText(result.toString()); } public void onFailure(Throwable caught) { resultaatLabel.setText(caught.getMessage()); } }; addService.add(Integer.parseInt(aBox.getText()), Integer.parseInt(bBox.getText()), callback); } } );
