GWT CellTable以编程方式选择CheckBoxCell [英] GWT CellTable programmatically select CheckBoxCell

问题描述

我有一个cellTable与CheckBoxCell列。我想做的是在单元格外面有一组按钮，让用户自动检查/取消选中不同的元素集（例如，检查所有/取消选中所有，但我想有更复杂的规则）。

我不明白是如何访问元素（我想通过row / col值???），并获取/设置值。

解决方案

任何人都可以帮我找出解决方法吗？假设你想要的是将复选框绑定到选择，并轻松地以编程方式选择一组项目（细微：选择项目，这将导致复选框被选中，而不是复选框），你会使用 MultiSelectionModel 。

您可以在 http://gwt.google.com/samples/Showcase/Showcase.html#!CwCellTable ，即：

  final MultiSelectionModel< ContactInfo> selectionModel = new MultiSelectionModel< ContactInfo>（
 ContactDatabase.ContactInfo.KEY_PROVIDER）; 
 cellTable.setSelectionModel（selectionModel，
 DefaultSelectionEventManager。< ContactInfo> createCheckboxManager（））; 
 ... 
列< ContactInfo，Boolean> checkColumn = new Column< ContactInfo，Boolean>（
 new CheckboxCell（true，false））{
 @Override 
 public Boolean getValue（ContactInfo object）{
 //获取值从选择模型。 
 return selectionModel.isSelected（object）; 
} 
}; 
 cellTable.addColumn（checkColumn，SafeHtmlUtils.fromSafeConstant（< br />））; 
 cellTable.setColumnWidth（checkColumn，40，Unit.PX）; 
  

然后，要选择一个项目

  selectionModel.setSelected（item，true）; 
  

，您可以类似地获取所有选定项目的集合 selectionModel.getSelectedSet （）。

I've got a cellTable with a CheckBoxCell column. What I'm trying to do is to have a set of buttons outside the celltable which let the user to automatically check/uncheck a different set of elements (for example check all / uncheck all, but I'd like to have more complex rules).

What I don't understand is how to access the element (I suppose via row/col values ???) and get/set the value.

Can anyone help me to figure out how to resolve it?

解决方案

Assuming what you want is to bind the checkbox to "selection" and easily select a bunch of items programmatically (subtlety: select items, which will result in checkbox being checked, rather than checking boxes), you'll use a MultiSelectionModel.

You'll find sample code in http://gwt.google.com/samples/Showcase/Showcase.html#!CwCellTable, that is:

final MultiSelectionModel<ContactInfo> selectionModel = new MultiSelectionModel<ContactInfo>(
    ContactDatabase.ContactInfo.KEY_PROVIDER);
cellTable.setSelectionModel(selectionModel,
    DefaultSelectionEventManager.<ContactInfo> createCheckboxManager());
…
Column<ContactInfo, Boolean> checkColumn = new Column<ContactInfo, Boolean>(
    new CheckboxCell(true, false)) {
  @Override
  public Boolean getValue(ContactInfo object) {
    // Get the value from the selection model.
    return selectionModel.isSelected(object);
  }
};
cellTable.addColumn(checkColumn, SafeHtmlUtils.fromSafeConstant("<br/>"));
cellTable.setColumnWidth(checkColumn, 40, Unit.PX);

Then, to select an item (and have its checkbox checked automatically), you'll simply do:

selectionModel.setSelected(item, true);

and you can similarly get the set of all selected items with selectionModel.getSelectedSet().

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