package org.litesoft.sandbox.csapp.client;

import org.litesoft.sandbox.csapp.client.widgets.*;

import com.google.gwt.core.client.*;
import com.google.gwt.event.dom.client.*;
import com.google.gwt.user.client.rpc.*;
import com.google.gwt.user.client.ui.*;

/**
 * Entry point classes define <code>onModuleLoad()</code>
 */
public class CSapp implements EntryPoint
{
    @Override
    public void onModuleLoad()
    {
        final Button button = new Button( "Click me" );
        final Label label = new Label();

        button.addClickHandler( new ClickHandler()
        {
            @Override
            public void onClick( ClickEvent event )
            {
                if ( label.getText().equals( "" ) )
                {
                    CSappService.Async.INSTANCE.getMessage( "Hello, World!", new MyAsyncCallback( label ) );
                }
                else
                {
                    label.setText( "" );
                }
            }
        } );

        // Assume that the host HTML has elements defined whose
        // IDs are "slot1", "slot2".  In a real app, you probably would not want
        // to hard-code IDs.  Instead, you could, for example, search for all
        // elements with a particular CSS class and replace them with widgets.
        //
        RootPanel.get( "slot1" ).add( button );
        RootPanel.get( "slot2" ).add( label );
        RootPanel.get( "slot3" ).add( new MyPanel() );
    }

    private static class MyAsyncCallback implements AsyncCallback<String>
    {
        private Label label;

        public MyAsyncCallback( Label label )
        {
            this.label = label;
        }

        @Override
        public void onSuccess( String result )
        {
            label.getElement().setInnerHTML( result );
        }

        @Override
        public void onFailure( Throwable throwable )
        {
            label.setText( "Failed to receive answer from server!" );
        }
    }
}