gwt - 在Enter键上显示所有选项的SuggestBox GWT

Question

我需要创建一个SuggestBox，在按下时将显示所有选项
Enter键。
我已经写了以下实现，看来是
工作正常。
我希望有人审查我的实现情况，并让我知道
在任何特定情况下都会引起问题。
另外，要传递给此SuggestBox的SuggestOracle应该具有
通过调用方法设置默认建议
MultiWordSuggestOracle上的setDefaultSuggestions()。我的任何用户
对这个事实，SuggestBox应该是透明的。因此，我想我会
需要包装(或扩展)MultiWordSuggestOracle以执行默认设置
建议设置。您能推荐一个好方法吗
这样做吗？

public class SuggestBoxWithAllOptions extends SuggestBox implements 
    KeyPressHandler { 
    public SuggestBoxWithAllOptions(MultiWordSuggestOracle oracle) { 
            super(oracle); 
            this.addKeyPressHandler(this); 
    } 
    @Override 
    public void onKeyPress(KeyPressEvent event) { 
            char c = event.getCharCode(); 
            int i = this.getText().length(); 
    if (c == KeyboardListener.KEY_ENTER && i == 0) { 
            /* Since the query string is null, the default suggestions 
           will get listed */ 
            this.showSuggestionList(); 
     } 
    } 
   } 

  /* Code for initializing the SuggestBox */ 
            List<String> suggestions = new ArrayList<String>(); 
            suggestions.add("Tablet"); 
            suggestions.add("Capsule"); 
            MultiWordSuggestOracle myOracle = new MultiWordSuggestOracle(); 
            myOracle.addAll(suggestions ); 
            myOracle.setDefaultSuggestionsFromText(suggestions); 
            SuggestBox mySuggest = new SuggestBoxWithAllOptions(myOracle); 

Answer 1

对我来说，这看起来不错。另一种方法是添加一个按钮以显示所有建议。可以将按钮设置为看起来像下拉框箭头的样式。

public class DropDownSuggestBox extends Composite {

public DropDownSuggestBox(final SuggestBox suggestBox) {
    FlowPanel layout = new FlowPanel();
    final Button dropDownButton = new Button();
    dropDownButton.setStyleName("slate-DropdownIcon");
    dropDownButton.setText("Show Options");
    dropDownButton.addClickHandler(new ClickHandler() {
        @Override
        public void onClick(ClickEvent event) {
            suggestBox.setFocus(true);
            suggestBox.showSuggestionList();
        }
    });

    layout.add(suggestBox);
    layout.add(dropDownButton);

    initWidget(layout);

    setStylePrimaryName("slate-DropDownSuggestBox");
}

}