Wicket：調色板設置默認選擇

Question

我試圖實現一個調色板。我嘗試設置一個默認選擇列表，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); 

我已經調試代碼，它的工作原理，但我選擇的值是空的。

這裏是我的調試變量的照片：

，但所選擇的領域仍然是空的！

我究竟做錯了什麼？

Answer 1

您不應該刪除every Category from the whole List which is already selected。

調色板組件必須在您的代碼中存儲choicesModel中的整個值列表listCategory。

所以，僅僅從實現刪除下面的代碼：

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

listCategory.removeAll(tmpList);