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我正在尝试创建我的自定义TabLayoutPanel扩展,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>

(即使我的包/工作区中没有定义选项卡和标题,错误消息也迫使我使用a:tab/a:header而不是g:tab/ ,但这可能不是问题)g:headera:

如果@UiConstructor像清单中那样在 ExpandableTabLayoutPanel 上存在注释,我会收到奇怪的错误:

[ERROR] [gwtreproduce] - <a:ExpandableTabLayoutPanel barHeight='20' barUnit='PX'> missing required attribute(s): arg1 barHeight Element <a:ExpandableTabLayoutPanel barHeight='20' barUnit='PX'> (:13)

当我禁用@UiConstructor时,我会遇到更奇怪的错误:

[ERROR] [gwtreproduce] - Errors in 'generated://E6338B946DFB2D28988DA492134093C7/reproduce/client/TestView_TestViewUiBinderImpl.java' :             [ERROR] [gwtreproduce] - Line 33: Type mismatch: cannot convert from TabLayoutPanel to ExpandableTabLayoutPanel 

扩展 TabLayoutPanel 我做错了什么?

还有一个问题:构造函数怎么可能TabLayoutPanel没有用@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)?

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1 回答 1

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对于您的问题:您必须将 (provided=true) 添加到小部件的 UiField 注释中。然后在代码中,createAndBindUi() 调用之前自己设置实例,如下所示:

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));

    }
}
于 2012-07-11T12:07:18.177 回答