From e56c45470c9a00e31d92e4e7d4b1cb1894d4de7d Mon Sep 17 00:00:00 2001
From: mtkennerly <mtkennerly@gmail.com>
Date: Fri, 11 Nov 2022 09:15:35 +0800
Subject: Add widget operation to find currently focused widget
---
native/src/widget/operation/focusable.rs | 34 ++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
(limited to 'native/src/widget')
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 }
+}
--
cgit