java - JFace/Eclipse 数据绑定(bind)在 AggregateValidationStatus 的 ChangeListener 中触发多重 validator

Question

我有一个带有 IChangeListener 的 AggregateValidationStatus。每次我选择/更改和组件时都会调用监听器，这正是我所需要的。我遇到的唯一问题是我必须在 ChangeListener 开头触发 MultiValidator 的 validate() 方法。遗憾的是，文档非常少，我发现的内容对我没有帮助。

我的ChangeListener

final AggregateValidationStatus aggregateValidationStatus = new AggregateValidationStatus(
        dataBindingContext.getBindings(), AggregateValidationStatus.MAX_SEVERITY);
aggregateValidationStatus.addChangeListener(new IChangeListener() {
    public void handleChange(ChangeEvent event) {
        //Here I have to trigger the MultiValidator to return either OK or ERROR
        boolean formIsValid = true;
        aggregateValidationStatus.getValue();
        for (Object o : dataBindingContext.getBindings()) {
            Binding binding = (Binding) o;
            IStatus status = (IStatus) binding.getValidationStatus().getValue();
            if (!status.isOK()) {
                formIsValid = false;
            }

            Control control = null;
            if (binding.getTarget() instanceof ISWTObservable) {
                ISWTObservable swtObservable = (ISWTObservable) binding.getTarget();
                control = (Control) swtObservable.getWidget();
            }
            if (binding.getTarget() instanceof CalendarComboObservableValue) {
                CalendarComboObservableValue observable = (CalendarComboObservableValue) binding.getTarget();
                control = (Control) observable.getControl();
            }

            if (binding.getTarget() instanceof IViewerObservable) {
                IViewerObservable observable = (IViewerObservable) binding.getTarget();
                control = observable.getViewer().getControl();
            }

            ControlDecoration decoration = decoratorMap.get(control);
            if (decoration != null) {
                if (status.isOK() || status.matches(Status.WARNING)) {
                    decoration.hide();
                } else {
                    decoration.setDescriptionText(status.getMessage());
                    decoration.show();
                }
            }
        }
        if (saveBtn != null)
            saveBtn.setEnabled(formIsValid);
    }
});

Answer 1

您的AggregateValidationStatus仅聚合datBindingContext的绑定(bind):

final AggregateValidationStatus aggregateValidationStatus = new AggregateValidationStatus(
    dataBindingContext.getBindings(), AggregateValidationStatus.MAX_SEVERITY);

MultiValidator 不是附加到单个绑定(bind)，而是附加到整个上下文。因此，如果您希望 AggregateValidationStatus 也监控 MultiValidator，您应该使用不同的构造函数:

final AggregateValidationStatus aggregateValidationStatus = new AggregateValidationStatus(
    dataBindingContext, AggregateValidationStatus.MAX_SEVERITY);

这应该会使 handleChanged 中 MultiValidator 的手动触发变得 super 流畅。