public async Task When_Sublist_Of_Last_Item_Cleared()
{
var initial_Depth_0 = 0;
var initial_Depth_1 = 64;
var initial_Depth_2 = 96;
var treeView = new Microsoft.UI.Xaml.Controls.TreeView();
treeView.ItemTemplate = TreeViewItemTemplate;
var testViewModelItems = Enumerable.Range(0, 2).Select(_ => Get_Depth_0_Item()).ToArray();
treeView.ItemsSource = testViewModelItems;
WindowHelper.WindowContent = treeView;
await WindowHelper.WaitForLoaded(treeView);
await WindowHelper.WaitForNonNull(() => treeView.ContainerFromItem(testViewModelItems.Last().Items.First().Items.Last()));
var currentItem = testViewModelItems.First().Items.Last().Items.First();
Assert.IsNotNull(treeView.ContainerFromItem(currentItem));
testViewModelItems.First().Items.Last().Items.Clear();
await WindowHelper.WaitFor(() => treeView.ContainerFromItem(currentItem) == null);
TestViewModelItem Get_Depth_0_Item() => new TestViewModelItem
{
Label = $"Item {++initial_Depth_0}",
Items =
{
Get_Depth_1_Item(),
Get_Depth_1_Item(),
Get_Depth_1_Item(),
}
};
TestViewModelItem Get_Depth_1_Item() => new TestViewModelItem
{
Label = $"Subitem {(char)(++initial_Depth_1)}",
Items =
{
Get_Depth_2_Item(),
Get_Depth_2_Item(),
}
};
TestViewModelItem Get_Depth_2_Item() => new TestViewModelItem
{
Label = $"Subitem {(char)(++initial_Depth_2)}"
};
}
public void ValidateTreeViewItemSourceChangeUpdatesChevronOpacity()
{
RunOnUIThread.Execute(() =>
{
var treeView = new TreeView();
var collection = new ObservableCollection <int>();
collection.Add(5);
treeView.ItemsSource = collection;
Content = treeView;
Content.UpdateLayout();
var tvi = (TreeViewItem)treeView.ContainerFromItem(5);
Verify.AreEqual(tvi.GlyphOpacity, 0.0);
tvi.ItemsSource = collection;
Content.UpdateLayout();
Verify.AreEqual(tvi.GlyphOpacity, 1.0);
});
}
public void TreeViewSelectionChangedMultipleMode()
{
RunOnUIThread.Execute(() =>
{
// input data:
// - 1
// - 11
// - 12
// - 13
// - 2
// - 21
// - 3
TreeViewSelectionChangedEventArgs selectionChangedEventArgs = null;
var treeView = new TreeView {
SelectionMode = TreeViewSelectionMode.Multiple
};
treeView.SelectionChanged += (s, e) => selectionChangedEventArgs = e;
var node1 = new TreeViewNode {
Content = "1", IsExpanded = true
};
var node11 = new TreeViewNode {
Content = "11"
};
var node12 = new TreeViewNode {
Content = "12"
};
var node13 = new TreeViewNode {
Content = "13"
};
node1.Children.Add(node11);
node1.Children.Add(node12);
node1.Children.Add(node13);
var node2 = new TreeViewNode {
Content = "2", IsExpanded = true
};
var node21 = new TreeViewNode {
Content = "21"
};
node2.Children.Add(node21);
var node3 = new TreeViewNode {
Content = "3"
};
treeView.RootNodes.Add(node1);
treeView.RootNodes.Add(node2);
treeView.RootNodes.Add(node3);
Content = treeView;
Content.UpdateLayout();
var tvi1 = (TreeViewItem)treeView.ContainerFromItem(node1);
var tvi11 = (TreeViewItem)treeView.ContainerFromItem(node11);
var tvi12 = (TreeViewItem)treeView.ContainerFromItem(node12);
var tvi13 = (TreeViewItem)treeView.ContainerFromItem(node13);
var tvi2 = (TreeViewItem)treeView.ContainerFromItem(node2);
var tvi21 = (TreeViewItem)treeView.ContainerFromItem(node21);
var tvi3 = (TreeViewItem)treeView.ContainerFromItem(node3);
// - 1 selected
// - 11 selected
// - 12 selected
// - 13 selected
// - 2
// - 21
// - 3
tvi1.IsSelected = true;
Verify.IsNotNull(selectionChangedEventArgs);
Verify.AreEqual(4, selectionChangedEventArgs.AddedItems.Count);
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node1));
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node11));
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node12));
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node13));
Verify.AreEqual(0, selectionChangedEventArgs.RemovedItems.Count);
selectionChangedEventArgs = null;
// - 1 selected
// - 11
// - 12 selected
// - 13 selected
// - 2
// - 21
// - 3
tvi11.IsSelected = true;
tvi11.IsSelected = false;
Verify.IsNotNull(selectionChangedEventArgs);
Verify.AreEqual(0, selectionChangedEventArgs.AddedItems.Count);
Verify.AreEqual(1, selectionChangedEventArgs.RemovedItems.Count);
Verify.IsTrue(selectionChangedEventArgs.RemovedItems.Contains(node11));
selectionChangedEventArgs = null;
// - 1 selected
// - 11 selected
// - 12 selected
// - 13 selected
// - 2 selected
// - 21 selected
// - 3 selected
treeView.SelectAll();
Verify.IsNotNull(selectionChangedEventArgs);
var items = selectionChangedEventArgs.AddedItems.ToList();
Verify.AreEqual(7, selectionChangedEventArgs.AddedItems.Count);
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node1));
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node11));
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node12));
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node13));
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node2));
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node21));
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(node3));
Verify.AreEqual(0, selectionChangedEventArgs.RemovedItems.Count);
});
}
public void TreeViewSelectionChangedSingleMode()
{
RunOnUIThread.Execute(() =>
{
// input data:
// - 1
// - 2
// - 3
TreeViewSelectionChangedEventArgs selectionChangedEventArgs = null;
var treeView = new TreeView {
SelectionMode = TreeViewSelectionMode.Single
};
treeView.SelectionChanged += (s, e1) => selectionChangedEventArgs = e1;
var collection = new ObservableCollection <int> {
1, 2, 3
};
treeView.ItemsSource = collection;
Content = treeView;
Content.UpdateLayout();
var tvi1 = (TreeViewItem)treeView.ContainerFromItem(1);
var tvi2 = (TreeViewItem)treeView.ContainerFromItem(2);
tvi1.IsSelected = true;
Verify.IsNotNull(selectionChangedEventArgs);
Verify.AreEqual(1, selectionChangedEventArgs.AddedItems.Count);
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(1));
Verify.AreEqual(0, selectionChangedEventArgs.RemovedItems.Count);
selectionChangedEventArgs = null;
tvi2.IsSelected = true;
Verify.IsNotNull(selectionChangedEventArgs);
Verify.AreEqual(1, selectionChangedEventArgs.AddedItems.Count);
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(2));
Verify.AreEqual(1, selectionChangedEventArgs.RemovedItems.Count);
Verify.IsTrue(selectionChangedEventArgs.RemovedItems.Contains(1));
selectionChangedEventArgs = null;
tvi2.IsSelected = false;
Verify.IsNotNull(selectionChangedEventArgs);
Verify.AreEqual(0, selectionChangedEventArgs.AddedItems.Count);
Verify.AreEqual(1, selectionChangedEventArgs.RemovedItems.Count);
Verify.IsTrue(selectionChangedEventArgs.RemovedItems.Contains(2));
selectionChangedEventArgs = null;
tvi1.IsSelected = true;
Verify.IsNotNull(selectionChangedEventArgs);
Verify.AreEqual(1, selectionChangedEventArgs.AddedItems.Count);
Verify.IsTrue(selectionChangedEventArgs.AddedItems.Contains(1));
Verify.AreEqual(0, selectionChangedEventArgs.RemovedItems.Count);
selectionChangedEventArgs = null;
treeView.ItemsSource = null;
Verify.IsNotNull(selectionChangedEventArgs);
Verify.AreEqual(0, selectionChangedEventArgs.AddedItems.Count);
Verify.AreEqual(1, selectionChangedEventArgs.RemovedItems.Count);
Verify.IsTrue(selectionChangedEventArgs.RemovedItems.Contains(1));
});
}