在单元格表格中获取标题列名称，然后点击GWT [英] Getting header column names in Cell table on click in GWT

问题描述

我正在使用GWT 2.2版本的Cell Table。我想获取点击了标题列的名称。我没有得到任何点击事件。

是否有任何工作可以完成我的任务。

解决方案

类似这样的事情？ ;）

  public class CellTableExample实现EntryPoint，ClickHandler {
 
 private static class SomeEntity {
 / * ... * / 
} 
 
 
 private static class ClickableTextHeader extends TextHeader {
 
 private ClickHandler handler; 
 
 public ClickableTextHeader（String text，ClickHandler handler）{
 super（text）; 
 this.handler = handler; 
 
 $ b @Override 
 public void onBrowserEvent（Context context，final Element elem，$ b $ final NativeEvent event）{
 
 //也许hijack click event 
 if（handler！= null）{
 
 if（Event.ONCLICK == Event.getTypeInt（event.getType（）））{
 
 handler.onClick（new ClickEvent（）{
 {
 setNativeEvent（event）; 
 setRelativeElement（elem）; 
 setSource（ClickableTextHeader.this）; 
} 
}）; 
 
 
 
 //默认的dom事件处理程序
 super.onBrowserEvent（context，elem，event）; 
} 
} 
 
 CellTable< SomeEntity> cellTable; 
 TextColumn< SomeEntity> firstColumn; 
 TextColumn< SomeEntity> secondColumn; 
 TextColumn< SomeEntity> thirdColumn; 
 
 @Override 
 public void onModuleLoad（）{
 
 / *某种程度上init列 - 它不是这个例子的要点* / 
 
 cellTable.addColumn（firstColumn，new ClickableTextHeader（First column header，this））; 
 cellTable.addColumn（secondColumn，new ClickableTextHeader（Second column header，this））; 
 cellTable.addColumn（thirdColumn，new ClickableTextHeader（Third column header，this））; 
} 
 
 @Override 
 public void onClick（ClickEvent event）{
 ClickableTextHeader source =（ClickableTextHeader）event.getSource（）; 
 Window.alert（source.getValue（））; 
 
 
 
 
 
 
 
如果我们使用简单侦听器，劫持事件看起来更简单接口 - 我只是想符合开箱即用的处理程序：）
 
I am using Cell Table of GWT 2.2 version.  I want to get the name of the header column on which I have clicked. I didn't get any click event on the same.

Is there any work around by which I can accomplish my task.
解决方案
Something like this? ;)
public class CellTableExample implements EntryPoint, ClickHandler {

    private static class SomeEntity {
        /* ... */
    }


    private static class ClickableTextHeader extends TextHeader {

        private ClickHandler handler;

        public ClickableTextHeader(String text, ClickHandler handler) {
            super(text);
            this.handler = handler;
        }

        @Override
        public void onBrowserEvent(Context context, final Element elem,
                final NativeEvent event) {

            //maybe hijack click event
            if(handler != null) {

                if(Event.ONCLICK == Event.getTypeInt(event.getType())) {

                    handler.onClick(new ClickEvent() {
                        {
                            setNativeEvent(event);
                            setRelativeElement(elem);
                            setSource(ClickableTextHeader.this);
                        }
                    });
                }
            }

            //default dom event handler 
            super.onBrowserEvent(context, elem, event);
        }
    }

    CellTable<SomeEntity> cellTable;
    TextColumn<SomeEntity> firstColumn;
    TextColumn<SomeEntity> secondColumn;
    TextColumn<SomeEntity> thirdColumn;

    @Override
    public void onModuleLoad() {

        /* somehow init columns - it's not the point for this example */

        cellTable.addColumn(firstColumn, new ClickableTextHeader("First column header", this));
        cellTable.addColumn(secondColumn, new ClickableTextHeader("Second column header", this));
        cellTable.addColumn(thirdColumn, new ClickableTextHeader("Third column header", this));
    }

    @Override
    public void onClick(ClickEvent event) {
        ClickableTextHeader source = (ClickableTextHeader) event.getSource();
        Window.alert(source.getValue());
    }
}
Hijacking event could look simpler if we used "simple listener interface" - i just wanted to be "semanticaly compliant with out-of-the-box Handlers" :)

                        
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