add stubs for allowing the user to provide their own storage mediums

crates/gpui_elements/src/editable_text/input_element.rs

@@ -41,6 +41,11 @@ impl TextInputElement {
         self.placeholder = Some(text.into());
         self
     }
+
+    pub fn with_storage(mut self, fn_init: impl Into<InitStorage>) -> Self {
+        self.init_storage = fn_init.into();
+        self
+    }
 }
 
 impl InteractiveElement for TextInputElement {

crates/gpui_elements/src/editable_text/storage.rs

@@ -14,9 +14,21 @@ pub enum TextBoundary {
 }
 
 #[derive(Clone, Default)]
-pub(super) struct InitStorage(Option<Rc<dyn Fn(&mut App) -> Box<dyn UnicodeTextStorage>>>);
+pub struct InitStorage(Option<Rc<dyn Fn(&mut App) -> Box<dyn UnicodeTextStorage>>>);
+
+// TODO: Doesnt yet compile in practice "implementation of Fn is not general enough"
+// InitStorage::from(|_cx| Box::new(StringStorage::default()) as Box<dyn UnicodeTextStorage>);
+impl<F> From<F> for InitStorage
+where
+    F: 'static + for<'app> Fn(&'app mut App) -> Box<dyn UnicodeTextStorage>,
+{
+    fn from(value: F) -> Self {
+        Self(Some(Rc::new(value)))
+    }
+}
+
 impl InitStorage {
-    pub fn exec(&self, cx: &mut App) -> Box<dyn UnicodeTextStorage> {
+    pub(super) fn exec(&self, cx: &mut App) -> Box<dyn UnicodeTextStorage> {
         match &self.0 {
             None => Box::new(StringStorage::default()),
             Some(init) => (*init)(cx),

crates/gpui_elements/src/editable_text/text_area_element.rs

@@ -40,6 +40,11 @@ impl TextAreaElement {
         self.placeholder = Some(text.into());
         self
     }
+
+    pub fn with_storage(mut self, fn_init: impl Into<InitStorage>) -> Self {
+        self.init_storage = fn_init.into();
+        self
+    }
 }
 
 impl InteractiveElement for TextAreaElement {