GXT Treepanel 复选框级联无法从叶子向上工作

Question

我正在使用带有复选框的 GXT TreePanel，并注意到似乎没有办法配置它，以便检查状态正确地从叶子级联到父节点...示例：

foo
   bar
   baz

Initial state: nothing checked.
Input: check bar, then baz.
Expected result: foo gets checked to reflect that all its child nodes are checked.
Actual result: foo remains unchecked.

Answer 1

您可以手动检查是否检查了所有子项，然后再次手动相应地设置其父项的状态。代码会是这样的：

tree.addCheckListener(new CheckChangedListener<ModelData>() {
  public void checkChanged(CheckChangedEvent<ModelData> event) {
    ModelData lastParent = null;
    for (ModelData item : tree.getCheckedSelection()) {
        BaseTreeModel btm = (BaseTreeModel)item;
        if (lastParent != null && btm.getParent() == lastParent) {
            continue;
        }
        boolean allChildrenChecked = true;
        for (ModelData modelData : btm.getParent().getChildren()) {
            if (!tree.isChecked(modelData)) {
                allChildrenChecked = false;
                break;
            }
        }
        tree.setChecked(btm.getParent(), allChildrenChecked);
        lastParent = btm.getParent();
    }
  }
});

Answer 2

使用 setCheckStyle(CheckCascade.CHILDREN); 方法。

它会帮助你。