Merge branch 'master' into feat/slider-orientation

3 files changed, 213 insertions, 0 deletions

diff --git a/native/src/widget/operation.rs b/native/src/widget/operation.rs
index ef636aa2..a0aa4117 100644
--- a/native/src/widget/operation.rs
+++ b/native/src/widget/operation.rs
@@ -1,9 +1,11 @@
 //! Query or update internal widget state.
 pub mod focusable;
 pub mod scrollable;
+pub mod text_input;
 
 pub use focusable::Focusable;
 pub use scrollable::Scrollable;
+pub use text_input::TextInput;
 
 use crate::widget::Id;
 
@@ -28,6 +30,9 @@ pub trait Operation<T> {
     /// Operates on a widget that can be scrolled.
     fn scrollable(&mut self, _state: &mut dyn Scrollable, _id: Option<&Id>) {}
 
+    /// Operates on a widget that has text input.
+    fn text_input(&mut self, _state: &mut dyn TextInput, _id: Option<&Id>) {}
+
     /// Finishes the [`Operation`] and returns its [`Outcome`].
     fn finish(&self) -> Outcome<T> {
         Outcome::None
@@ -58,3 +63,46 @@ where
         }
     }
 }
+
+/// Produces an [`Operation`] that applies the given [`Operation`] to the
+/// children of a container with the given [`Id`].
+pub fn scoped<T: 'static>(
+    target: Id,
+    operation: impl Operation<T> + 'static,
+) -> impl Operation<T> {
+    struct ScopedOperation<Message> {
+        target: Id,
+        operation: Box<dyn Operation<Message>>,
+    }
+
+    impl<Message: 'static> Operation<Message> for ScopedOperation<Message> {
+        fn container(
+            &mut self,
+            id: Option<&Id>,
+            operate_on_children: &mut dyn FnMut(&mut dyn Operation<Message>),
+        ) {
+            if id == Some(&self.target) {
+                operate_on_children(self.operation.as_mut());
+            } else {
+                operate_on_children(self);
+            }
+        }
+
+        fn finish(&self) -> Outcome<Message> {
+            match self.operation.finish() {
+                Outcome::Chain(next) => {
+                    Outcome::Chain(Box::new(ScopedOperation {
+                        target: self.target.clone(),
+                        operation: next,
+                    }))
+                }
+                outcome => outcome,
+            }
+        }
+    }
+
+    ScopedOperation {
+        target,
+        operation: Box::new(operation),
+    }
+}
diff --git a/native/src/widget/operation/focusable.rs b/native/src/widget/operation/focusable.rs
index f17bf178..0067006b 100644
--- a/native/src/widget/operation/focusable.rs
+++ b/native/src/widget/operation/focusable.rs
@@ -167,3 +167,37 @@ pub fn focus_next<T>() -> impl Operation<T> {
 
     count(|count| FocusNext { count, current: 0 })
 }
+
+/// Produces an [`Operation`] that searches for the current focused widget
+/// and stores its ID. This ignores widgets that do not have an ID.
+pub fn find_focused() -> impl Operation<Id> {
+    struct FindFocused {
+        focused: Option<Id>,
+    }
+
+    impl Operation<Id> for FindFocused {
+        fn focusable(&mut self, state: &mut dyn Focusable, id: Option<&Id>) {
+            if state.is_focused() && id.is_some() {
+                self.focused = id.cloned();
+            }
+        }
+
+        fn container(
+            &mut self,
+            _id: Option<&Id>,
+            operate_on_children: &mut dyn FnMut(&mut dyn Operation<Id>),
+        ) {
+            operate_on_children(self)
+        }
+
+        fn finish(&self) -> Outcome<Id> {
+            if let Some(id) = &self.focused {
+                Outcome::Some(id.clone())
+            } else {
+                Outcome::None
+            }
+        }
+    }
+
+    FindFocused { focused: None }
+}
diff --git a/native/src/widget/operation/text_input.rs b/native/src/widget/operation/text_input.rs
new file mode 100644
index 00000000..4c773e99
--- /dev/null
+++ b/native/src/widget/operation/text_input.rs
@@ -0,0 +1,131 @@
+//! Operate on widgets that have text input.
+use crate::widget::operation::Operation;
+use crate::widget::Id;
+
+/// The internal state of a widget that has text input.
+pub trait TextInput {
+    /// Moves the cursor of the text input to the front of the input text.
+    fn move_cursor_to_front(&mut self);
+    /// Moves the cursor of the text input to the end of the input text.
+    fn move_cursor_to_end(&mut self);
+    /// Moves the cursor of the text input to an arbitrary location.
+    fn move_cursor_to(&mut self, position: usize);
+    /// Selects all the content of the text input.
+    fn select_all(&mut self);
+}
+
+/// Produces an [`Operation`] that moves the cursor of the widget with the given [`Id`] to the
+/// front.
+pub fn move_cursor_to_front<T>(target: Id) -> impl Operation<T> {
+    struct MoveCursor {
+        target: Id,
+    }
+
+    impl<T> Operation<T> for MoveCursor {
+        fn text_input(&mut self, state: &mut dyn TextInput, id: Option<&Id>) {
+            match id {
+                Some(id) if id == &self.target => {
+                    state.move_cursor_to_front();
+                }
+                _ => {}
+            }
+        }
+
+        fn container(
+            &mut self,
+            _id: Option<&Id>,
+            operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
+        ) {
+            operate_on_children(self)
+        }
+    }
+
+    MoveCursor { target }
+}
+
+/// Produces an [`Operation`] that moves the cursor of the widget with the given [`Id`] to the
+/// end.
+pub fn move_cursor_to_end<T>(target: Id) -> impl Operation<T> {
+    struct MoveCursor {
+        target: Id,
+    }
+
+    impl<T> Operation<T> for MoveCursor {
+        fn text_input(&mut self, state: &mut dyn TextInput, id: Option<&Id>) {
+            match id {
+                Some(id) if id == &self.target => {
+                    state.move_cursor_to_end();
+                }
+                _ => {}
+            }
+        }
+
+        fn container(
+            &mut self,
+            _id: Option<&Id>,
+            operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
+        ) {
+            operate_on_children(self)
+        }
+    }
+
+    MoveCursor { target }
+}
+
+/// Produces an [`Operation`] that moves the cursor of the widget with the given [`Id`] to the
+/// provided position.
+pub fn move_cursor_to<T>(target: Id, position: usize) -> impl Operation<T> {
+    struct MoveCursor {
+        target: Id,
+        position: usize,
+    }
+
+    impl<T> Operation<T> for MoveCursor {
+        fn text_input(&mut self, state: &mut dyn TextInput, id: Option<&Id>) {
+            match id {
+                Some(id) if id == &self.target => {
+                    state.move_cursor_to(self.position);
+                }
+                _ => {}
+            }
+        }
+
+        fn container(
+            &mut self,
+            _id: Option<&Id>,
+            operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
+        ) {
+            operate_on_children(self)
+        }
+    }
+
+    MoveCursor { target, position }
+}
+
+/// Produces an [`Operation`] that selects all the content of the widget with the given [`Id`].
+pub fn select_all<T>(target: Id) -> impl Operation<T> {
+    struct MoveCursor {
+        target: Id,
+    }
+
+    impl<T> Operation<T> for MoveCursor {
+        fn text_input(&mut self, state: &mut dyn TextInput, id: Option<&Id>) {
+            match id {
+                Some(id) if id == &self.target => {
+                    state.select_all();
+                }
+                _ => {}
+            }
+        }
+
+        fn container(
+            &mut self,
+            _id: Option<&Id>,
+            operate_on_children: &mut dyn FnMut(&mut dyn Operation<T>),
+        ) {
+            operate_on_children(self)
+        }
+    }
+
+    MoveCursor { target }
+}