If statement rsx

examples/hello_world.rs

@@ -83,11 +83,15 @@ fn app(cx: &Arc<Context>) -> View {
     // }
 
     rsx! {
+        if %count (*count.get() > 0) {
             my_component (ctx, view) {
-            let area = ctx.allocate(0, 0, 10, 10);
+                let area = ctx.allocate(0, 1, 10, 10);
                 ctx.draw_view(area, view);
             }
         }
+
+        %count "{count}"
+    }
     .view(cx.clone())
 }
 

src/macros.rs

@@ -6,14 +6,38 @@ macro_rules! rsx {
 
     ($($rsx:tt)+) => {{
         let mut r = $crate::frontend::Rsx::new();
+        {
             $crate::rsx_scope!(r, $($rsx)+);
+        }
         r
     }};
 }
 
 #[macro_export]
 macro_rules! rsx_scope {
+    ($rsx:expr, if $(%$($dep:ident)+)? ($st:expr) {$($inner:tt)*} $($rest:tt)*) => {
+        {
+            $($(let $dep = $dep.clone();)+)?
+
+            $rsx.dynamic_scope({
+                $($(let $dep = $dep.clone();)+)?
+                move |scope| {
+                    if $st {
+                        if scope.children.lock().unwrap().len() == 0 {
+                            $crate::rsx_child!(scope, $($inner)*);
+                        }
+                    } else {
+                        scope.children.lock().unwrap().clear();
+                    }
+                }
+            }, vec![$($(Box::new($dep)),+)?]);
+        }
+
+        $crate::rsx_scope!($rsx, $($rest)*);
+    };
+
     ($rsx:expr, $(%$($dep:ident)+)? $text:literal $($rest:tt)*) => {
+        {
             let scope = $crate::component::Scope::new();
 
             $($(let $dep = $dep.clone();)+)?
@@ -21,24 +45,32 @@ macro_rules! rsx_scope {
             $crate::rsx_child!(scope, $text);
 
             $rsx.static_scope(scope);
+        }
+
         $crate::rsx_scope!($rsx, $($rest)*);
     };
 
     ($rsx:expr, $component:ident ($ctx:ident, $view:ident) $body:block $($rest:tt)*) => {
+        {
             let scope = $crate::component::Scope::new();
 
             $crate::rsx_child!(scope, $component ($ctx, $view) $body);
 
             $rsx.static_scope(scope);
+        }
+
         $crate::rsx_scope!($rsx, $($rest)*);
     };
 
     ($rsx:expr, $component:ident $($rest:tt)*) => {
+        {
             let scope = $crate::component::Scope::new();
 
             $crate::rsx_child!(scope, $component $body);
 
             $rsx.static_scope(scope);
+        }
+
         $crate::rsx_scope!($rsx, $($rest)*);
     };
 
@@ -48,17 +80,25 @@ macro_rules! rsx_scope {
 #[macro_export]
 macro_rules! rsx_child {
     ($scope:expr, $text:literal $($rest:tt)*) => {
+        {
             $scope.view(Arc::new(move |ctx| ctx.draw_text(Point { x: 0, y: 0 }, &format!($text))));
+        }
+
         $crate::rsx_child!($scope, $($rest)*);
     };
 
     ($scope:expr, $component:ident ($ctx:ident, $view:ident) $body:block $($rest:tt)*) => {
+        {
             $scope.child($component, Some(Arc::new(|$ctx, $view| $body)));
+        }
+
         $crate::rsx_child!($scope, $($rest)*);
     };
 
     ($scope:expr, $component:ident $($rest:tt)*) => {
+        {
             $scope.child($component, None);
+        }
         $crate::rsx_child!($scope, $($rest)*);
     };