In this case, the reference widget is the TreeItem widget the user selects.
在这里，参照的部件是用户选择的TreeIte m部件。
When a TreeItem widget is created, an ItemData bean is associated with the widget.
在创建TreeIte m部件时，把一个ItemDatabean与这个部件关联起来。
It then creates a TreeItem widget and binds the application object with the widget.
然后，创建TreeIte m部件并把应用程序对象与部件绑定起来。
The TreeItem widget will also be used to help create sub-trees and position pop-up windows.
TreeItem部件用于帮助创建子树和确定弹出窗口的位置。
To work around this limitation, I created a dummy child TreeItem widget and set it to be invisible (lines 39, 40).
为了解决这个问题，我创建了一个假的子TreeItem部件并把它设置为不可见（第 39、40行）。
In this case, a TreeItem widget is used as either a tree node or a tree leaf to represent an organizational unit and an employee, respectively.
这里使用TreeIte m部件作为树节点或树叶，分别代表组织单元和职员。
As part of the lazy loading strategy, when an organizational TreeItem widget is created, you don't have the data to create all of its child widgets.
按照惰性装载策略，在创建组织TreeIte m部件时，还没有创建所有子部件所需的数据。
This class member will contain the application object that stores employee data or organizational data depending on what the TreeItem widget represents.
根据TreeIte m部件代表的内容不同，这个类成员将包含存储职员数据或组织数据的应用程序对象。
We create a tree by instantiating the tree class (line 17 of listing 1) and create the branches of the tree by instantiating the TreeItem class (lines 20, 23, and 26).
我们通过实例化tree类(清单1中的第17行)创建一个树，并通过实例化TreeIte m类(第20、23和26行)创建树的分支。
It then associates the TreeItem widget and event type with the callback instance so that it knows how to proceed after the data for the RESTful Web service is returned.
然后，把TreeIte m部件和事件类型与这个回调实例关联起来，让它知道在RESTfulWeb服务返回数据之后如何处理数据。
The abstract base class has a member TreeItem that will be an instance of the TreeItem widget in GWT and will be the client data with which the callback is associated when the callback class is used.
抽象基类有一个成员TreeItem，它是GWT中TreeIte m部件的实例，包含客户机数据，在使用回调类时回调与这些数据相关联。
The abstract base class has a member TreeItem that will be an instance of the TreeItem widget in GWT and will be the client data with which the callback is associated when the callback class is used.
抽象基类有一个成员TreeItem，它是GWT中TreeIte m部件的实例，包含客户机数据，在使用回调类时回调与这些数据相关联。
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