Add Stack view

Author: PoignardAzur

masonry/src/widgets/stack.rs

@@ -222,9 +222,9 @@ impl Stack {
     pub fn child_mut<'t>(
         this: &'t mut WidgetMut<'_, Self>,
         idx: usize,
-    ) -> Option<WidgetMut<'t, dyn Widget>> {
+    ) -> WidgetMut<'t, dyn Widget> {
         let child = &mut this.widget.children[idx];
-        Some(this.ctx.get_mut(&mut child.widget))
+        this.ctx.get_mut(&mut child.widget)
     }
 
     /// Updates the alignment for the child at `idx`,
@@ -629,7 +629,7 @@ mod tests {
         let mut harness =
             TestHarness::create_with_size(default_property_set(), widget, window_size);
         harness.edit_root_widget(|mut stack| {
-            let mut child = Stack::child_mut(&mut stack, 1).unwrap();
+            let mut child = Stack::child_mut(&mut stack, 1);
             assert_eq!(
                 child
                     .try_downcast::<Label>()
@@ -639,9 +639,6 @@ mod tests {
                     .to_string(),
                 "world"
             );
-            std::mem::drop(child);
-
-            assert!(Stack::child_mut(&mut stack, 2).is_none());
         });
 
         // TODO - test out-of-bounds access?

xilem/examples/to_do_mvc.rs

@@ -8,7 +8,7 @@
 
 use winit::error::EventLoopError;
 use xilem::style::Style as _;
-use xilem::view::{Axis, button, checkbox, flex, flex_row, text_input};
+use xilem::view::{Axis, button, checkbox, flex, flex_row, stack, text_input};
 use xilem::{EventLoop, EventLoopBuilder, InsertNewline, WidgetView, WindowOptions, Xilem};
 
 struct Task {
@@ -71,7 +71,7 @@ fn app_logic(task_list: &mut TaskList) -> impl WidgetView<TaskList> + use<> {
         })
         .collect::<Vec<_>>();
 
-    flex((first_line, tasks)).padding(50.)
+    stack((first_line, tasks)).padding(50.)
 }
 
 fn run(event_loop: EventLoopBuilder) -> Result<(), EventLoopError> {

xilem/src/view/mod.rs

@@ -32,6 +32,9 @@ pub use sized_box::*;
 mod spinner;
 pub use spinner::*;
 
+mod stack;
+pub use stack::*;
+
 mod image;
 pub use image::*;