Add .id method and text_editor::focus task

examples/editor/src/main.rs

@@ -1,8 +1,8 @@
 use iced::highlighter;
 use iced::keyboard;
 use iced::widget::{
-    button, center_x, column, container, operation, pick_list, row, space,
+    self, button, center_x, column, container, operation::focus, pick_list,
-    text, text_editor, toggler, tooltip,
+    row, space, text, text_editor, toggler, tooltip,
 };
 use iced::{Center, Element, Fill, Font, Task, Theme};
 
@@ -20,6 +20,7 @@ pub fn main() -> iced::Result {
 }
 
 struct Editor {
+    editor_id: widget::Id,
     file: Option<PathBuf>,
     content: text_editor::Content,
     theme: highlighter::Theme,
@@ -42,8 +43,10 @@ enum Message {
 
 impl Editor {
     fn new() -> (Self, Task<Message>) {
+        let id = widget::Id::unique();
         (
             Self {
+                editor_id: id.clone(),
                 file: None,
                 content: text_editor::Content::new(),
                 theme: highlighter::Theme::SolarizedDark,
@@ -59,7 +62,7 @@ impl Editor {
                     )),
                     Message::FileOpened,
                 ),
-                operation::focus_next(),
+                focus(id),
             ]),
         )
     }
@@ -196,6 +199,7 @@ impl Editor {
         column![
             controls,
             text_editor(&self.content)
+                .id(self.editor_id.clone())
                 .height(Fill)
                 .on_action(Message::ActionPerformed)
                 .wrapping(if self.word_wrap {

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);
     }
 }