Add .id method and text_editor::focus task

widget/src/text_editor.rs

@@ -104,6 +104,7 @@ pub struct TextEditor<
     Theme: Catalog,
     Renderer: text::Renderer,
 {
+    id: Option<widget::Id>,
     content: &'a Content<Renderer>,
     placeholder: Option<text::Fragment<'a>>,
     font: Option<Renderer::Font>,
@@ -135,6 +136,7 @@ where
     /// Creates new [`TextEditor`] with the given [`Content`].
     pub fn new(content: &'a Content<Renderer>) -> Self {
         Self {
+            id: None,
             content,
             placeholder: None,
             font: None,
@@ -156,6 +158,12 @@ where
             last_status: None,
         }
     }
+
+    /// Sets the [`Id`](widget::Id) of the [`TextEditor`].
+    pub fn id(mut self, id: impl Into<widget::Id>) -> Self {
+        self.id = Some(id.into());
+        self
+    }
 }
 
 impl<'a, Highlighter, Message, Theme, Renderer>
@@ -275,6 +283,7 @@ where
         ) -> highlighter::Format<Renderer::Font>,
     ) -> TextEditor<'a, H, Message, Theme, Renderer> {
         TextEditor {
+            id: self.id,
             content: self.content,
             placeholder: self.placeholder,
             font: self.font,
@@ -1057,7 +1066,7 @@ where
     ) {
         let state = tree.state.downcast_mut::<State<Highlighter>>();
 
-        operation.focusable(None, layout.bounds(), state);
+        operation.focusable(self.id.as_ref(), layout.bounds(), state);
     }
 }