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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.ComponentModel.Design.Serialization;
using System.ComponentModel;
// - NameCreationServiceImp - Implementing INameCreationService
// - The INameCreationService interface is used to supply a name to the control just created
// - In the CreateName() we use the same naming algorithm used by Visual Studio: just
// - increment an integer counter until we find a name that isn't already in use.
namespace DesignSurfaceExt;
internal sealed class NameCreationServiceImp : INameCreationService
{
public NameCreationServiceImp() { }
public string CreateName(IContainer container, Type type)
{
if (container is null)
return string.Empty;
ComponentCollection cc = container.Components;
int min = int.MaxValue;
int max = int.MinValue;
int count = 0;
int i = 0;
while (i < cc.Count)
{
if (cc[i] is Component comp && comp.GetType() == type)
{
string name = comp.Site.Name;
if (name.StartsWith(type.Name, StringComparison.Ordinal))
{
count++;
try
{
int value = int.Parse(name[type.Name.Length..]);
if (value < min)
min = value;
if (value > max)
max = value;
}
catch (Exception) { }
}
}
i++;
}
if (count == 0)
{
return $"{type.Name}1";
}
else if (min > 1)
{
int j = min - 1;
return $"{type.Name}{j}";
}
else
{
int j = max + 1;
return $"{type.Name}{j}";
}
}
public bool IsValidName(string name)
{
// - Check that name is "something" and that is a string with at least one char
if (string.IsNullOrEmpty(name))
return false;
// - then the first character must be a letter
if (!(char.IsLetter(name, 0)))
return false;
// - then don't allow a leading underscore
if (name.StartsWith('_'))
return false;
// - ok, it's a valid name
return true;
}
public void ValidateName(string name)
{
// - Use our existing method to check, if it's invalid throw an exception
if (!(IsValidName(name)))
throw new ArgumentException($"Invalid name: {name}");
}
}
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