GWT中的自定义TabLayoutPanel

时间:2012-07-11 11:36:26

标签: gwt uibinder gwt2

我正在尝试创建自定义TabLayoutPanel扩展程序,我的代码如下:

public class ExpandableTabLayoutPanel extends TabLayoutPanel {

    @UiConstructor
    public ExpandableTabLayoutPanel(double barHeight, Unit barUnit) {
        super(barHeight, barUnit);
        addExpandableBehaviour();
    }

    private addExpandableBehaviour(){
      //...
    }
}

在这里,我从UIBinder调用它:

<a:ExpandableTabLayoutPanel barHeight="20" barUnit="PX">
    <a:tab>
    <a:header>header</a:header>
        <a:AdvancedRichTextArea styleName="{style.area}" ui:field="area"/>
    </a:tab>
</a:ExpandableTabLayoutPanel>

(即使我没有在我的a:tab / a:header中定义标签和标头,我也会被错误消息强制使用g:tab / g:header而不是a: / @UiConstructor {1}}包/工作区,但这可能不是问题)

如果在列表中的ExpandableTabLayoutPanel上存在[ERROR] [gwtreproduce] - <a:ExpandableTabLayoutPanel barHeight='20' barUnit='PX'> missing required attribute(s): arg1 barHeight Element <a:ExpandableTabLayoutPanel barHeight='20' barUnit='PX'> (:13) 注释,我会收到奇怪的错误:

@UiConstructor

当我禁用[ERROR] [gwtreproduce] - Errors in 'generated://E6338B946DFB2D28988DA492134093C7/reproduce/client/TestView_TestViewUiBinderImpl.java' : [ERROR] [gwtreproduce] - Line 33: Type mismatch: cannot convert from TabLayoutPanel to ExpandableTabLayoutPanel 时,我的错误甚至更加奇怪:

TabLayoutPanel

扩展TabLayoutPanel我做错了什么?

并提出问题:{{1}}构造函数如何不用@UiConstructor注释,并且可以在UiBinder中使用(UiBinder如何知道要调用哪个构造函数)?

1 个答案:

答案 0 :(得分:0)

对于你的问题:你必须添加(provided = true)到你的小部件的UiField注释。然后在代码中,自己设置实例,之前 createAndBindUi()调用如下:

class Whaoo extends Composite{

    /* with 'provided', UiBinder don't call any constructor */
    @UiField(provided = true)
    final Great foo;

    interface WhaooUiBinder extends
        UiBinder<Widget, Whaoo> {}

    private static WhaooUiBinder uiBinder = 
         GWT.create(WhaooUiBinder.class);

    public Whaoo() {

        // initialize "provided" before createAndBindUi call
        foo = new Great(String bar, int pouet); 

        initWidget(uiBinder.createAndBindUi(this));

    }
}