Allow clipboard access in Widget::on_event

native/src/clipboard.rs

@@ -0,0 +1,8 @@
+/// A buffer for short-term storage and transfer within and between
+/// applications.
+pub trait Clipboard {
+    /// Returns the current content of the [`Clipboard`] as text.
+    ///
+    /// [`Clipboard`]: trait.Clipboard.html
+    fn content(&self) -> Option<String>;
+}