feat: Basic Unix platform adapter (#198)

Cargo.toml

@@ -3,6 +3,7 @@ members = [
     "common",
     "consumer",
     "platforms/macos",
+    "platforms/unix",
     "platforms/windows",
     "platforms/winit",
 ]

consumer/src/node.rs

@@ -103,25 +103,30 @@ impl<'a> Node<'a> {
                 (self.tree_state.node_by_id(*parent).unwrap(), *index)
             })
     }
+}
 
+impl NodeState {
     pub fn child_ids(
         &self,
     ) -> impl DoubleEndedIterator<Item = NodeId>
            + ExactSizeIterator<Item = NodeId>
            + FusedIterator<Item = NodeId>
-           + 'a {
-        let data = &self.state.data;
+           + '_ {
+        let data = &self.data;
         data.children.iter().copied()
     }
+}
 
+impl<'a> Node<'a> {
     pub fn children(
         &self,
     ) -> impl DoubleEndedIterator<Item = Node<'a>>
            + ExactSizeIterator<Item = Node<'a>>
            + FusedIterator<Item = Node<'a>>
            + 'a {
         let state = self.tree_state;
-        self.child_ids()
+        self.state
+            .child_ids()
             .map(move |id| state.node_by_id(id).unwrap())
     }
 
@@ -267,23 +272,31 @@ impl<'a> Node<'a> {
         };
         parent_transform * self.direct_transform()
     }
+}
+
+impl NodeState {
+    pub fn raw_bounds(&self) -> Option<Rect> {
+        self.data().bounds
+    }
+}
 
+impl<'a> Node<'a> {
     pub fn has_bounds(&self) -> bool {
-        self.data().bounds.is_some()
+        self.state.raw_bounds().is_some()
     }
 
     /// Returns the node's transformed bounding box relative to the tree's
     /// container (e.g. window).
     pub fn bounding_box(&self) -> Option<Rect> {
-        self.data()
-            .bounds
+        self.state
+            .raw_bounds()
             .as_ref()
             .map(|rect| self.transform().transform_rect_bbox(*rect))
     }
 
     pub(crate) fn bounding_box_in_coordinate_space(&self, other: &Node) -> Option<Rect> {
-        self.data()
-            .bounds
+        self.state
+            .raw_bounds()
             .as_ref()
             .map(|rect| self.relative_transform(other).transform_rect_bbox(*rect))
     }
@@ -307,7 +320,7 @@ impl<'a> Node<'a> {
         }
 
         if filter_result == FilterResult::Include {
-            if let Some(rect) = &self.data().bounds {
+            if let Some(rect) = &self.state.raw_bounds() {
                 if rect.contains(point) {
                     return Some((*self, point));
                 }
@@ -413,6 +426,10 @@ impl NodeState {
         self.data().multiline
     }
 
+    pub fn is_protected(&self) -> bool {
+        self.data().protected
+    }
+
     pub fn default_action_verb(&self) -> Option<DefaultActionVerb> {
         self.data().default_action_verb
     }

consumer/src/tree.rs

@@ -3,6 +3,7 @@
 // the LICENSE-APACHE file) or the MIT license (found in
 // the LICENSE-MIT file), at your option.
 
+use accesskit::kurbo::Point;
 use accesskit::{
     Action, ActionData, ActionHandler, ActionRequest, Live, Node as NodeData, NodeId,
     TextSelection, Tree as TreeData, TreeUpdate,
@@ -386,6 +387,14 @@ impl Tree {
         })
     }
 
+    pub fn scroll_to_point(&self, target: NodeId, point: Point) {
+        self.action_handler.do_action(ActionRequest {
+            action: Action::ScrollToPoint,
+            target,
+            data: Some(ActionData::ScrollToPoint(point)),
+        })
+    }
+
     pub fn select_text_range(&self, range: &TextRange) {
         let selection = TextSelection {
             anchor: range.start.downgrade(),

platforms/unix/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "accesskit_unix"
+version = "0.1.0"
+authors = ["Arnold Loubriat <datatriny@gmail.com>"]
+license = "MIT/Apache-2.0"
+description = "AccessKit UI accessibility infrastructure: Linux adapter"
+categories = ["gui"]
+keywords = ["gui", "ui", "accessibility"]
+repository = "https://github.com/AccessKit/accesskit"
+readme = "README.md"
+edition = "2021"
+
+[dependencies]
+accesskit = { version = "0.8.1", path = "../../common" }
+accesskit_consumer = { version = "0.11.0", path = "../../consumer" }
+async-channel = "1.8.0"
+atspi = "0.8.7"
+futures-lite = "1.12.0"
+parking_lot = "0.12.1"
+serde = "1.0"
+zbus = "3.6"

platforms/unix/README.md

@@ -0,0 +1,3 @@
+# AccessKit Unix adapter
+
+This is the Unix adapter for [AccessKit](https://accesskit.dev/). It exposes an AccessKit accessibility tree through the AT-SPI protocol.