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(#502) Added GetParent and GetParents to MultiSelectionPrompt

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So it it possible to find the parent(s) of a given item.
This commit is contained in:
Nils Andresen 2021-10-14 08:07:31 +02:00 committed by Patrik Svensson
parent f5a2735501
commit 949f35defd
2 changed files with 105 additions and 0 deletions
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35
src/Spectre.Console/Prompts/MultiSelectionPrompt.cs
View File

@ -112,6 +112,41 @@ namespace Spectre.Console
.ToList();
}
/// <summary>
/// Returns all parent items of the given <paramref name="item"/>.
/// </summary>
/// <param name="item">The item for which to find the parents.</param>
/// <returns>The parent items, or an empty list, if the given item has no parents.</returns>
public IEnumerable<T> GetParents(T item)
{
var promptItem = Tree.Find(item);
if (promptItem == null)
{
throw new ArgumentOutOfRangeException(nameof(item), "item not found in tree.");
}
var parents = new List<ListPromptItem<T>>();
while (promptItem.Parent != null)
{
promptItem = promptItem.Parent;
parents.Add(promptItem);
}
return parents
.ReverseEnumerable()
.Select(x => x.Data);
}
/// <summary>
/// Returns the parent item of the given <paramref name="item"/>.
/// </summary>
/// <param name="item">The item for which to find the parent.</param>
/// <returns>The parent item, or <c>null</c> if the given item has no parent.</returns>
public T? GetParent(T item)
{
return GetParents(item).LastOrDefault();
}
/// <inheritdoc/>
ListPromptInputResult IListPromptStrategy<T>.HandleInput(ConsoleKeyInfo key, ListPromptState<T> state)
{

70
test/Spectre.Console.Tests/Unit/Prompts/MultiSelectionPromptTests.cs
View File

@ -82,5 +82,75 @@ namespace Spectre.Console.Tests.Unit
// Then
choice.IsSelected.ShouldBeTrue();
}
[Fact]
public void Should_Get_The_Direct_Parent()
{
// Given
var prompt = new MultiSelectionPrompt<string>();
prompt.AddChoice("root").AddChild("level-1").AddChild("level-2").AddChild("item");
// When
var actual = prompt.GetParent("item");
// Then
actual.ShouldBe("level-2");
}
[Fact]
public void Should_Get_The_List_Of_All_Parents()
{
// Given
var prompt = new MultiSelectionPrompt<string>();
prompt.AddChoice("root").AddChild("level-1").AddChild("level-2").AddChild("item");
// When
var actual = prompt.GetParents("item");
// Then
actual.ShouldBe(new []{"root", "level-1", "level-2"});
}
[Fact]
public void Should_Get_An_Empty_List_Of_Parents_For_Root_Node()
{
// Given
var prompt = new MultiSelectionPrompt<string>();
prompt.AddChoice("root");
// When
var actual = prompt.GetParents("root");
// Then
actual.ShouldBeEmpty();
}
[Fact]
public void Should_Get_Null_As_Direct_Parent_Of_Root_Node()
{
// Given
var prompt = new MultiSelectionPrompt<string>();
prompt.AddChoice("root");
// When
var actual = prompt.GetParent("root");
// Then
actual.ShouldBeNull();
}
[Fact]
public void Should_Throw_When_Getting_Parents_Of_Non_Existing_Node()
{
// Given
var prompt = new MultiSelectionPrompt<string>();
prompt.AddChoice("root").AddChild("level-1").AddChild("level-2").AddChild("item");
// When
Action action = () => prompt.GetParents("non-existing");
// Then
action.ShouldThrow<ArgumentOutOfRangeException>();
}
}
}