如何从单元格表中删除一行 [英] How to remove a row from the Cell Table

问题描述

起初我使用了网格。
创建新版本的GWT后，我想要替换CellTable上的网格。

解决方案

javadoc 了解详情。我的例子就像你会在那里找到的那​​样（只是一点扩展）：

  public void onModuleLoad（）{
 final CellTable< Row> table = new CellTable< Row>（）; 
 
 TextColumn< Row> firstColumn = new TextColumn< Starter.Row>（）{
 
 @Override 
 public String getValue（Row object）{
 return object.firstColumn; 
} 
}; 
 table.addColumn（firstColumn，header one）; 
 
 TextColumn< Row> secondColumn = new TextColumn< Starter.Row>（）{
 
 @Override 
 public String getValue（Row object）{
 return object.secondColumn; 
} 
}; 
 table.addColumn（secondColumn，header two）; 
 
 TextColumn< Row> thirdColumn = new TextColumn< Starter.Row>（）{
 
 @Override 
 public String getValue（Row object）{
 return object.thirdColumn; 
} 
}; 
 table.addColumn（thirdColumn，header three）; 
 
 table.setRowCount（getList（）。size（））; 
 final ListDataProvider< Row> dataProvider = new ListDataProvider< Starter.Row>（getList（））; 
 dataProvider.addDataDisplay（table）; 
 
 final SingleSelectionModel< Row> selectionModel = new SingleSelectionModel< Starter.Row>（）; 
 table.setSelectionModel（selectionModel）; 
 
按钮btn =新建按钮（删除条目）; 
 btn.addClickHandler（new ClickHandler（）{
 
 @Override 
 public void onClick（ClickEvent event）{
 Row selected = selectionModel.getSelectedObject（）; 
 if（selected！= null）{
 dataProvider.getList（）。remove（selected）; 
} 
} 
}）; 
 
 RootPanel.get（）。add（table）; 
 RootPanel.get（）。add（btn）; 
 
} 
 
私人类行{
 
私人字符串firstColumn; 
 private String secondColumn; 
 private String thirdColumn; 
 
 public Row（String firstColumn，String secondColumn，String thirdColumn）{
 this.firstColumn = firstColumn; 
 this.secondColumn = secondColumn; 
 this.thirdColumn = thirdColumn; 
} 
 
} 
 
私人LinkedList<行> getList（）{
 LinkedList< Row> list = new LinkedList< Row>（）; 
 list.add（new Row（first，entry，foo））; 
 list.add（new Row（second，entry，foo））; 
 list.add（new Row（third，entry，foo））; 
 list.add（new Row（fourth，entry，foo））; 
返回列表; 
} 
  

At first I used the Grid. After creating a new version of the GWT, I want to replace the Grid on the CellTable.

解决方案

Check out the javadoc for details. My example is like the one you'll find there (just a little extended):

public void onModuleLoad() {
    final CellTable<Row> table = new CellTable<Row>();

    TextColumn<Row> firstColumn = new TextColumn<Starter.Row>() {

        @Override
        public String getValue(Row object) {
            return object.firstColumn;
        }
    };
    table.addColumn(firstColumn, "header one");

    TextColumn<Row> secondColumn = new TextColumn<Starter.Row>() {

        @Override
        public String getValue(Row object) {
            return object.secondColumn;
        }
    };
    table.addColumn(secondColumn, "header two");

    TextColumn<Row> thirdColumn = new TextColumn<Starter.Row>() {

        @Override
        public String getValue(Row object) {
            return object.thirdColumn;
        }
    };
    table.addColumn(thirdColumn, "header three");

    table.setRowCount(getList().size());
    final ListDataProvider<Row> dataProvider = new ListDataProvider<Starter.Row>(getList());
    dataProvider.addDataDisplay(table);

    final SingleSelectionModel<Row> selectionModel = new SingleSelectionModel<Starter.Row>();
    table.setSelectionModel(selectionModel);

    Button btn = new Button("delete entry");
    btn.addClickHandler(new ClickHandler() {

        @Override
        public void onClick(ClickEvent event) {
            Row selected = selectionModel.getSelectedObject();
            if (selected != null) {
                dataProvider.getList().remove(selected);
            }
        }
    });

    RootPanel.get().add(table);
    RootPanel.get().add(btn);

}

private class Row {

    private String firstColumn;
    private String secondColumn;
    private String thirdColumn;

    public Row(String firstColumn, String secondColumn, String thirdColumn) {
        this.firstColumn = firstColumn;
        this.secondColumn = secondColumn;
        this.thirdColumn = thirdColumn;
    }

}

private LinkedList<Row> getList() {
    LinkedList<Row> list = new LinkedList<Row>();
    list.add(new Row("first", "entry", "foo"));
    list.add(new Row("second", "entry", "foo"));
    list.add(new Row("third", "entry", "foo"));
    list.add(new Row("fourth", "entry", "foo"));
    return list;
}

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