public static LazyObservableTree <DirectoryInfo> CreateTestTree()
{
var rootDirectory = new DirectoryInfo(@"C:\");
var directoryComparer = Comparer <DirectoryInfo> .Create((d1, d2) =>
string.Compare(d1.Name, d2.Name, StringComparison.InvariantCultureIgnoreCase));
var rootTree = new LazyObservableTree <DirectoryInfo>(rootDirectory, directoryComparer,
tree =>
{
if (tree.Value == null)
{
return(new LazyObservableTree <DirectoryInfo> [0]);
}
try
{
var dirs = tree.Value.EnumerateDirectories("*", SearchOption.TopDirectoryOnly).ToArray();
var children = dirs.Select(dir => {
var ty = new LazyObservableTree <DirectoryInfo>(dir, tree.Comparer, tree.ChildFactory);
return(ty);
}).ToArray();
return(children);
}
catch (Exception)
{
return(new LazyObservableTree <DirectoryInfo> [0]);
}
});
return(rootTree);
}
private static IEnumerable <LazyDirectoryTree> childFactory_Run(
LazyObservableTree <DirectoryInfo> parent)
{
if (parent.Value == null)
{
throw new NullReferenceException("Error: Directory cannot be null");
}
try
{
var dirs = parent.Value.EnumerateDirectories("*", SearchOption.TopDirectoryOnly).ToArray();
var children = dirs.Select(dir =>
{
var ty = new LazyDirectoryTree(dir);
return(ty);
}).ToArray();
return(children);
}
catch (Exception)
{
var dirTree = parent as LazyDirectoryTree;
if (dirTree != null)
{
dirTree.AccessAuthorised = false;
}
return(new LazyDirectoryTree[0]);
}
}
public void TestChildRegenerationOnChildFactoryChange()
{
var root = CreateTestTree();
var oldChildren = root.Children;
var expectedNames = root.Value.EnumerateDirectories("*", SearchOption.TopDirectoryOnly)
.Select(dir => dir.Name + "_Test")
.Reverse()
.OrderBy(dir => dir, DefaultComparers.StringComparer_IgnoreCase)
.ToArray();
bool isChildListChanged = false;
root.ChildListChanged += (sender, old) =>
{
isChildListChanged = true;
Assert.IsTrue(ReferenceEquals(sender, root));
Assert.IsTrue(ReferenceEquals(old, oldChildren));
};
root.ChildFactory = tree =>
{
var dirs = tree.Value.EnumerateDirectories("*", SearchOption.TopDirectoryOnly).ToArray();
var children = dirs.Select(dir =>
{
var newDi = new DirectoryInfo(dir.FullName + "_Test");
var ty = new LazyObservableTree <DirectoryInfo>(newDi, tree.Comparer, tree.ChildFactory);
return(ty);
}).ToArray();
return(children);
};
Assert.IsTrue(isChildListChanged);
var newChildNames = root.Children.Select(child => child.Value.Name)
.Reverse()
.OrderBy(dir => dir, DefaultComparers.StringComparer_IgnoreCase)
.ToArray();
Assert.AreEqual(expectedNames.Length, newChildNames.Length);
for (int i = 0; i < expectedNames.Length; i++)
{
string name1 = expectedNames[i];
string name2 = newChildNames[i];
bool namesAreEqual = string.Equals(name1, name2, StringComparison.InvariantCultureIgnoreCase);
Assert.IsTrue(namesAreEqual);
}
int fgs = 0;
}
private static IEnumerable <LazyObservableTree <DirectoryInfo> > getChildrenFromSource(LazyObservableTree <DirectoryInfo> root)
{
Logger.WriteLine($"GenerateCildren: this= {root.Value.FullName}");
var linkTree = root as LinkedLayTree;
if (linkTree == null)
{
return(new LinkedLayTree[0]);
}
if (!linkTree.Source.AreChildrenGenerated)
{
//linkTree.RemoveSourceEvents(linkTree.Source);
linkTree.Source.GenerateChildren();
//linkTree.AddSourceEvents(linkTree.Source);
return(new LinkedLayTree[0]);
}
var selectedChildren = linkTree.Source.Children.Cast <LazyDirectoryTree>()
.Where(child => child.IsSelected != false)
.ToArray();
var newChildren = selectedChildren.Select(child =>
{
var newTree = new LinkedLayTree(child);
return(newTree);
});
return(newChildren);
}
