Feat: Add UIA trees

[amerikrainian]

As per the title, added the expanded, collapsed, and tree view item announcements for UIA. An example to test this can be found here

Feedback welcome!

Closes #32

[DataTriny]

Hi @amerikrainian, thanks for that. Looks good already. Just a few requests to align with Chromium.

[DataTriny]

I've modified your example here to set size_of_set on the parent and to use active_descendant to manage focus inside the tree view.

Tested on Windows 11 with NVDA, the Narrator and JAWS.

[DataTriny]

Since TreeItem nodes are not considered selection containers, they currently are not able to propagate their size_of_set property to their children. I think size_of_set_from_container needs to be generalized anyway to also work on nested lists in paragraphs. Here's how I'd do it:

diff --git a/consumer/src/node.rs b/consumer/src/node.rs
index cdd36cf..ff0b06a 100644
--- a/consumer/src/node.rs
+++ b/consumer/src/node.rs
@@ -609,8 +609,15 @@ impl<'a> Node<'a> {
         &self,
         filter: &impl Fn(&Node) -> FilterResult,
     ) -> Option<usize> {
-        self.selection_container(filter)
-            .and_then(|c| c.size_of_set())
+        let mut parent = self.filtered_parent(filter);
+        while let Some(p) = parent {
+            if let Some(size_of_set) = p.size_of_set() {
+                return Some(size_of_set);
+            } else {
+                parent = p.filtered_parent(filter);
+            }
+        }
+        None
     }

     pub fn size_of_set(&self) -> Option<usize> {

[DataTriny]

Also please don't forget to run cargo fmt on your changes. Code formatting will be enforced by the CI once I trigger it for you.

[DataTriny]

Congratulation on your first pull request here! Thanks!