TreeView selection API spec #31
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@MikeHillberg - once you review and approve, we can get this into v.next of WinUI. |
* Add some more background for those not as familiar with the current TreeView * Update the examples to be close to real-world usage. * Reordered the sections to match the spec template * Explain the SelectedItems behavior change in the Remarks section
| // Set SelectedNode for single selection | ||
| treeView.SelectedNode = node; | ||
| // Get SelectedNode in single selection | ||
| TreeViewNode selectedNode = treeView.SelectedNode; |
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What is the value of SelectedNode if SelectedNodes was used to select multiple nodes?
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What is the value of SelectedNode if SelectedNodes was used to select multiple nodes?
Currently it returns the first node in SelectedNodes list (maybe it should return the newly selected node which is the last one in list?).
winrt::TreeViewNode TreeView::SelectedNode()
{
auto nodes = SelectedNodes();
return nodes.Size() > 0 ? nodes.GetAt(0) : nullptr;
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How does ListView behave?
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ListView returns first item in list too so they are consistent.
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| - Add `SelectedNode`: get/set the selected TreeViewNode for single selection | ||
| - Add `SelectedItem`: get/set the selected item for single selection | ||
| - Add `SelectedItems`: get the SelectedItems collection. |
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What is the reason that SelectedItems cannot be set via binding? As SelectedItem can be set by two-way binding, it seems to make sense to me to give the same functionality to SelectedItems as well.
<TreeView ItemsSource="{x:Bind Descendants}" SelectedItems="{x:Bind CurrentDescendants, Mode=TwoWay}" />
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This matches ListView.SelectedItems, but I realize that doesn't answer the question. ListView also supports source collections that implement ISelectionInfo, which is a way for the source to have full control over the selection, but it's pretty advanced.
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@kaiguo @MikeHillberg Yeah, I'd say selecting a group of items should be as simple as possible. Right now, looking at the TreeView Selection API, I need to interact with the specific TreeView object to select multiple items. Hence, if I just wanted to mark a group of items in a TreeView as selected, I can't easily do that without somehow referencing an object of the View (as in MVVM). That seems to me like a pretty big oversight and an unnecessary hurdle for the developer.
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