Wicket：调色板设置默认选中

Question

我试图实现一个调色板。我尝试设置默认的选定列表，但它是空的。

myLists：

    // here I get a Set of the categorys which are already in that group
    Set<Category> selectedCategorysSet = new HashSet<Category>();
    selectedCategorysSet = group.getCategorys();

    // here I get all categorys exists
    List<Category> listCategory = new ArrayList<Category>();
    listCategory = catDao.getAll(Category.class);

    List<Category> selectedCats = new ArrayList<Category>();
    List<Category> tmpList = new ArrayList<Category>();

    // the palette doesnt accept an Set so I added the set to a List
    selectedCats.addAll(selectedCategorysSet); 

    // here I delete every Category from the whole List which is already selected (stored in a temporary list)
    for(Category catList:listCategory){
        for(Category cat:selectedCategorysSet){
            if(cat.getCategoryId() == catList.getCategoryId()){
                tmpList.add(catList);
            }
        }
    }

    listCategory.removeAll(tmpList);

    /*
       two multiple select boxes which switches items between each other
    */
    IChoiceRenderer<Category> renderer = new ChoiceRenderer<Category>("title","categoryId");

    final Palette<Category> palette = new Palette<Category>("palette",
            new ListModel<Category>(selectedCats),
            new CollectionModel<Category>(listCategory),
            renderer, 10, false);

我已经调试了该代码，它可以工作，但我选择的值是空的。

以下是调试变量的图片：

但所选字段仍为空！

我做错了什么？

Answer 1

您不应删除 every Category from the whole List which is already selected 。

调色板组件必须在代码中存储choicesModel的整个值列表，listCategory。

因此，只需从您的实现中删除以下代码：

for(Category catList:listCategory){
    for(Category cat:selectedCategorysSet){
        if(cat.getCategoryId() == catList.getCategoryId()){
            tmpList.add(catList);
        }
    }
}

listCategory.removeAll(tmpList);