Question

我们正在尝试实现类似于确认字段的字段，该字段允许继续/退出表单（而不是仅允许继续/更改表单字段的常规确认字段）。

我们设法使这项工作做得很好，但唯一缺少的是能够知道quitForm字段之后的下一个字段。

当我们调用NextStep()时，表单退出而不是像确认一样移动到下一个字段。

我们如何模仿确认的行为？

这是我们的实现，它与Confirmation.cs非常相似：

public class QuitFormField<T> : Field<T> where T : class
{
        private const string c_continueTerm = "Continue";
        private const string c_quitTerm = "Quit";

        public QuitFormField(
            string prompt,
            string nextField,
            ActiveDelegate<T> condition, 
            IEnumerable<string> dependencies) : base(name: Guid.NewGuid().ToString(), role:FieldRole.Confirm)
        {
            SetPrompt(new PromptAttribute(prompt));
            SetDefine((state, field) =>
            {
                field.AddDescription(value: c_continueTerm, description: c_continueTerm).AddTerms(value: c_continueTerm, terms: c_continueTerm);
                field.AddDescription(value: c_quitTerm, description: c_quitTerm).AddTerms(value: c_quitTerm, terms: c_quitTerm);
                return Task.FromResult(true);
            });

            SetType(null);
            SetDependencies(dependencies?.ToArray());
            SetActive(condition);
            _next = (value, state) => (string)value == c_continueTerm ? new NextStep(nextField) : new NextStep(StepDirection.Quit);

        }
}

澄清：我们希望NextStep（）移动到下一个字段，而不必指定下一个字段名称

Answer 1

我让它以我的形式工作。

变更：

new NextStep(nextField)给出了编译错误。已更改为：new NextStep(new []{nextField})
将_next = delegate更改为SetNext(delegate)

我为Field添加了一些方法和属性覆盖。

private const string c_continueTerm = "Continue";
private const string c_quitTerm = "Quit";

public QuitFormField(
    string prompt,
    string nextField,
    ActiveDelegate<T> condition,
    IEnumerable<string> dependencies) : base(name: Guid.NewGuid().ToString(), role: FieldRole.Confirm)
{
    SetPrompt(new PromptAttribute(prompt));
    SetDefine((state, field) =>
    {
        field.AddDescription(value: c_continueTerm, description: c_continueTerm).AddTerms(value: c_continueTerm, terms: c_continueTerm);
        field.AddDescription(value: c_quitTerm, description: c_quitTerm).AddTerms(value: c_quitTerm, terms: c_quitTerm);
        return Task.FromResult(true);
    });

    SetType(null);
    SetDependencies(dependencies?.ToArray());
    SetActive(condition);
    SetNext((value, state) => (string)value == c_continueTerm ? new NextStep(new []{nextField}) : new NextStep(StepDirection.Quit));
}

public override object GetValue(T state)
{
    return null;
}

public override IEnumerable<string> Dependencies => _dependencies;

public override bool Active(T state)
{
    return _condition(state);
}

public override NextStep Next(object value, T state)
{
    return _next((string)value, state);
}

public override void SetValue(T state, object value)
{}

public override bool IsUnknown(T state)
{
    return true;
}

public override void SetUnknown(T state)
{
    throw new NotImplementedException();
}

如何创建自定义确认按钮

1 个答案: