added variables

src/examples.rs

@@ -4,11 +4,18 @@ pub fn examples() -> Element {
     rsx! {
         styling: Some(styling()),
 
-        button { class: "btn", on_click: fn(_, _, document) {
+        button { class: "btn", on_click: fn(btn: &mut Button, _, document) {
+            let count = document.use_state::<u32>("count");
+            *count += 1;
+            btn.children.set_text(&count.to_string());
+            if *count == 10 {
                 document.exit();
+            }
         }, "Click me!" }
 
         text { "Welcome!" }
+
+        @count: i32;
     }
 }
 

src/lib.rs

@@ -154,6 +154,10 @@ impl Document {
     pub fn draw(&mut self, element: &mut Element) {
         self.element = element;
     }
+
+    pub fn use_state<T>(&self, name: &str) -> &mut T {
+        &mut self.get_element_by_id::<crate::ui::DataHolder<T>>(name).unwrap().data
+    }
 }
 
 impl Default for Children {
@@ -238,6 +242,11 @@ impl RenderWriter {
     pub fn result(&self) -> RenderResult {
         RenderResult(self.w.clone(), self.style.get(self.focused).clone())
     }
+
+    pub fn hidden(&mut self) -> RenderResult {
+        self.style.0.visible = false;
+        RenderResult(self.w.clone(), self.style.get(self.focused).clone())
+    }
 }
 
 impl<T> Default for Handler<T> {

src/rsx.rs

@@ -12,6 +12,17 @@ macro_rules! check_expr {
 }
 #[macro_export]
 macro_rules! parse_rsx_param {
+    // Data fields
+    ($elem:expr, @$name:ident: $type:ty; $($rest:tt)*) => {
+        if $elem.children.is_none() {$elem.children = $crate::Children::Children(Vec::new(), 0)}
+        if let $crate::Children::Children(children, _) = &mut $elem.children {
+            let mut $name = $crate::ui::data_holder::<$type>();
+            $name.id = stringify!($name);
+            children.push($name);
+        }
+        osui::parse_rsx_param!($elem, $($rest)*)
+    };
+
     ($elem:expr, for ($($for:tt)*) $code:block $($rest:tt)*) => {
         if $elem.children.is_none() {$elem.children = $crate::Children::Children(Vec::new(), 0)}
         if let $crate::Children::Children(children, _) = &mut $elem.children {

src/ui/mod.rs

@@ -114,6 +114,6 @@ pub fn data_holder<'a, T: std::default::Default>() -> Box<DataHolder<'a, T>> {
 
 impl<'a, T: std::fmt::Debug + Send + Sync> ElementWidget for DataHolder<'a, T> {
     fn render(&self, focused: bool, _: usize, _: usize) -> RenderResult {
-        RenderWriter::new(focused, self.style.clone()).result()
+        RenderWriter::new(focused, self.style.clone()).hidden()
     }
 }