/// <summary>
/// Recursively removes every binding where the object is either the target or the source.
/// </summary>
/// <param name="obj">The object.</param>
public static void ClearAllBindings(this IElementHost obj)
{
var hosts = new Queue <IElementHost>(new[] { obj });
while (hosts.Any())
{
var host = hosts.Dequeue();
foreach (var child in host.Children)
{
var subHost = child as IElementHost;
if (subHost != null)
{
hosts.Enqueue(subHost);
}
else
{
child.ClearAllBindings();
}
}
var pairable = host as IPairable;
if (pairable != null)
{
pairable.ClearAllBindings();
}
}
}
protected void SetSubmitValues(IElementHost parent)
{
foreach (var control in parent.Children.OfType <IControl>().Where(c => c.ShouldSubmit()))
{
if (!control.Validate(out string[] errors))
{
ValidationErrors[control.SubmitKey] = errors;
}
else
{
ValidationErrors.Remove(control.SubmitKey);
}
if ((control as SelectList)?.SelectedItem is SelectListFieldItem item)
{
_submitValues[control.SubmitKey + ".Key"] = item.Key;
}
_submitValues[control.SubmitKey] = control.StringValue;
}
}
/// <summary>
/// Returns the first element found with the specified ID that is of type <typeparamref name="T"/>.
/// If no element is found, a new instance will be created with the specified ID and added to the parent.
/// </summary>
/// <typeparam name="T">The type of the element to get or create.</typeparam>
/// <param name="host">The <see cref="IElementHost"/> object.</param>
/// <param name="id">The identifier of the element. If a new element is created, its ID will be set to this value.</param>
/// <returns>The first element found of type <typeparamref name="T"/> -or-
/// the newly created element if no element was found.</returns>
/// <remarks>When creating a new instance, if <typeparamref name="T"/> is an interface type, the framework will use the
/// <see cref="M:MXContainer.Resolve"/> method; otherwise, the framework will use the <see cref="M:Activator.CreateInstance"/> method.</remarks>
public static T GetOrCreateChild <T>(this IElementHost host, string id)
where T : IElement
{
var child = host.Children.FirstOrDefault(c => c is T && c.ID == id);
if (child == null)
{
if (MonoCross.Utilities.Device.Reflector.IsInterface(typeof(T)))
{
child = MXContainer.Resolve <T>();
}
else
{
try
{
child = Activator.CreateInstance <T>();
}
catch (MissingMemberException)
{
iApp.Log.Error("Unable to find a default constructor for type " + typeof(T).Name);
}
}
if (child == null)
{
iApp.Log.Error("Could not create an instance of element type " + typeof(T).Name);
}
else
{
child.ID = id;
host.AddChild(child);
}
}
return((T)child);
}
public void RegisterRoot(IElementHost elementHost)
{
roots.Add(elementHost);
}
public void RegisterRoot (IElementHost elementHost)
{
roots.Add (elementHost);
}
/// <summary>
/// Returns the first element found that is of type <typeparamref name="T"/>.
/// </summary>
/// <typeparam name="T">The type of the element.</typeparam>
/// <param name="host">The <see cref="IElementHost"/> object.</param>
/// <returns>The first element found of type <typeparamref name="T"/> -or-
/// <c>null</c> if no element of the specified type was found.</returns>
public static T GetChild <T>(this IElementHost host)
where T : IElement
{
return((T)host.Children.FirstOrDefault(c => c is T));
}
/// <summary>
/// Returns the first element found with the specified ID that is of type <typeparamref name="T"/>.
/// </summary>
/// <typeparam name="T">The type of the element.</typeparam>
/// <param name="host">The <see cref="IElementHost"/> object.</param>
/// <param name="id">The identifier of the element.</param>
/// <returns>The first element found with the specified ID that is of type <typeparamref name="T"/> -or-
/// <c>null</c> if no element was found.</returns>
public static T GetChild <T>(this IElementHost host, string id)
where T : IElement
{
return((T)host.Children.FirstOrDefault(c => c is T && c.ID == id));
}
/// <summary>
/// Returns the first element found with the specified ID.
/// </summary>
/// <param name="host">The <see cref="IElementHost"/> object.</param>
/// <param name="id">The identifier of the element.</param>
/// <returns>The first element found with the specified ID -or- <c>null</c> if no element was found.</returns>
public static IElement GetChild(this IElementHost host, string id)
{
return(host.Children.FirstOrDefault(c => c.ID == id));
}
