Merge pull request #2890 from Remmirad/pub_text_field_select_range

Make `text_input::State` `select_range` public

core/src/widget/operation/text_input.rs

@@ -21,6 +21,8 @@ pub trait TextInput {
 
     /// Selects all the content of the text input.
     fn select_all(&mut self);
+    /// Selects the given content range of the text input.
+    fn select_range(&mut self, start: usize, end: usize);
 }
 
 /// Produces an [`Operation`] that moves the cursor of the widget with the given [`Id`] to the
@@ -142,3 +144,38 @@ pub fn select_all<T>(target: Id) -> impl Operation<T> {
 
     MoveCursor { target }
 }
+
+/// Produces an [`Operation`] that selects the given content range of the widget with the given [`Id`].
+pub fn select_range<T>(
+    target: Id,
+    start: usize,
+    end: usize,
+) -> impl Operation<T> {
+    struct SelectRange {
+        target: Id,
+        start: usize,
+        end: usize,
+    }
+
+    impl<T> Operation<T> for SelectRange {
+        fn text_input(
+            &mut self,
+            id: Option<&Id>,
+            _bounds: Rectangle,
+            state: &mut dyn TextInput,
+        ) {
+            match id {
+                Some(id) if id == &self.target => {
+                    state.select_range(self.start, self.end);
+                }
+                _ => {}
+            }
+        }
+
+        fn traverse(&mut self, operate: &mut dyn FnMut(&mut dyn Operation<T>)) {
+            operate(self);
+        }
+    }
+
+    SelectRange { target, start, end }
+}