remove state generic from a lot of things

src/widget/position/stack.rs

@@ -2,13 +2,13 @@ use std::marker::PhantomData;
 
 use crate::prelude::*;
 
-pub struct Stack<State> {
-    pub children: Vec<WidgetHandle<State>>,
+pub struct Stack {
+    pub children: Vec<WidgetHandle>,
     pub size: StackSize,
 }
 
-impl<State: 'static> Widget<State> for Stack<State> {
-    fn draw(&mut self, painter: &mut Painter<State>) {
+impl Widget for Stack {
+    fn draw(&mut self, painter: &mut Painter) {
         let mut iter = self.children.iter();
         if let Some(child) = iter.next() {
             painter.child_layer();
@@ -20,14 +20,14 @@ impl<State: 'static> Widget<State> for Stack<State> {
         }
     }
 
-    fn desired_width(&mut self, ctx: &mut SizeCtx<State>) -> Len {
+    fn desired_width(&mut self, ctx: &mut SizeCtx) -> Len {
         match self.size {
             StackSize::Default => Len::default(),
             StackSize::Child(i) => ctx.width(&self.children[i]),
         }
     }
 
-    fn desired_height(&mut self, ctx: &mut SizeCtx<State>) -> Len {
+    fn desired_height(&mut self, ctx: &mut SizeCtx) -> Len {
         match self.size {
             StackSize::Default => Len::default(),
             StackSize::Child(i) => ctx.height(&self.children[i]),
@@ -48,14 +48,14 @@ pub struct StackBuilder<State, const LEN: usize, Wa: WidgetArrLike<State, LEN, T
     _pd: PhantomData<(State, Tag)>,
 }
 
-impl<State, const LEN: usize, Wa: WidgetArrLike<State, LEN, Tag>, Tag> FnOnce<(&mut Ui<State>,)>
+impl<State, const LEN: usize, Wa: WidgetArrLike<State, LEN, Tag>, Tag> FnOnce<(&mut State,)>
     for StackBuilder<State, LEN, Wa, Tag>
 {
-    type Output = Stack<State>;
+    type Output = Stack;
 
-    extern "rust-call" fn call_once(self, args: (&mut Ui<State>,)) -> Self::Output {
+    extern "rust-call" fn call_once(self, args: (&mut State,)) -> Self::Output {
         Stack {
-            children: self.children.ui(args.0).arr.into_iter().collect(),
+            children: self.children.add(args.0).arr.into_iter().collect(),
             size: self.size,
         }
     }