GWT实现多个搜索引擎结果的聚集

package com.gwtapps.multisearch.client.view; import com.google.gwt.user.client.History; import com.google.gwt.user.client.HistoryListener; import com.google.gwt.user.client.Window; import com.google.gwt.user.client.ui.Button; import com.google.gwt.user.client.ui.ClickListener; import com.google.gwt.user.client.ui.Composite; import com.google.gwt.user.client.ui.HasHorizontalAlignment; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.KeyboardListenerAdapter; import com.google.gwt.user.client.ui.TextBox; import com.google.gwt.user.client.ui.VerticalPanel; import com.google.gwt.user.client.ui.Widget; public class MultiSearchView extends Composite implements HistoryListener{ private MultiSearchViewListener listener; private VerticalPanel mainPanel = new VerticalPanel(); private TextBox searchBox = new TextBox(); private Button submitButton = new Button("Search"); public MultiSearchView( MultiSearchViewListener listener ){ this.listener = listener; initWidget( mainPanel ); HorizontalPanel searchPanel = new HorizontalPanel(); searchPanel.add( searchBox ); searchPanel.add( submitButton ); searchBox.addKeyboardListener(new KeyboardListenerAdapter(){ public void onKeyPress(Widget sender, char keyCode, int modifiers){ if(keyCode == KEY_ENTER ) onSearch(); } }); submitButton.addClickListener(new ClickListener(){ public void onClick(Widget sender){ onSearch(); } }); mainPanel.setStyleName("multiSearchView"); searchPanel.setStyleName("searchPanel"); searchBox.setStyleName("searchBox"); submitButton.setStyleName("submitButton"); mainPanel.add( searchPanel ); mainPanel.setCellHorizontalAlignment( searchPanel, HasHorizontalAlignment.ALIGN_CENTER ); History.addHistoryListener(this); } private void onSearch(){ String query = searchBox.getText(); if( query.length() > 0 ) History.newItem(query); } public void addSearchResultsView( SearchResultsView view ){ mainPanel.add( view ); } public void onHistoryChanged(String historyToken) { listener.onSearch(historyToken); } }