1 files changed, 15 insertions, 22 deletions

diff --git a/widget/src/container.rs b/widget/src/container.rs
index 8b6638d4..e917471f 100644
--- a/widget/src/container.rs
+++ b/widget/src/container.rs
@@ -13,7 +13,7 @@ use crate::core::{
     Padding, Pixels, Point, Rectangle, Shadow, Shell, Size, Theme, Vector,
     Widget,
 };
-use crate::runtime::Command;
+use crate::runtime::Task;
 
 /// An element decorating some content.
 ///
@@ -122,9 +122,6 @@ where
 
     /// Sets the [`Container`] to fill all the available space.
     ///
-    /// This can be useful to quickly position content when chained with
-    /// alignment functions—like [`center`].
-    ///
     /// Calling this method is equivalent to chaining [`fill_x`] and
     /// [`fill_y`].
     ///
@@ -159,20 +156,14 @@ where
         self
     }
 
-    /// Sets the [`Container`] to fill the available space in the horizontal axis
-    /// and centers its contents there.
-    pub fn center_x(mut self) -> Self {
-        self.width = Length::Fill;
-        self.horizontal_alignment = alignment::Horizontal::Center;
-        self
+    /// Sets the width of the [`Container`] and centers its contents horizontally.
+    pub fn center_x(self, width: impl Into<Length>) -> Self {
+        self.width(width).align_x(alignment::Horizontal::Center)
     }
 
-    /// Sets the [`Container`] to fill the available space in the vertical axis
-    /// and centers its contents there.
-    pub fn center_y(mut self) -> Self {
-        self.height = Length::Fill;
-        self.vertical_alignment = alignment::Vertical::Center;
-        self
+    /// Sets the height of the [`Container`] and centers its contents vertically.
+    pub fn center_y(self, height: impl Into<Length>) -> Self {
+        self.height(height).align_y(alignment::Vertical::Center)
     }
 
     /// Centers the contents in both the horizontal and vertical axes of the
@@ -182,8 +173,10 @@ where
     ///
     /// [`center_x`]: Self::center_x
     /// [`center_y`]: Self::center_y
-    pub fn center(self) -> Self {
-        self.center_x().center_y()
+    pub fn center(self, length: impl Into<Length>) -> Self {
+        let length = length.into();
+
+        self.center_x(length).center_y(length)
     }
 
     /// Sets whether the contents of the [`Container`] should be clipped on
@@ -265,7 +258,7 @@ where
         tree: &mut Tree,
         layout: Layout<'_>,
         renderer: &Renderer,
-        operation: &mut dyn Operation<Message>,
+        operation: &mut dyn Operation<()>,
     ) {
         operation.container(
             self.id.as_ref().map(|id| &id.0),
@@ -464,9 +457,9 @@ impl From<Id> for widget::Id {
     }
 }
 
-/// Produces a [`Command`] that queries the visible screen bounds of the
+/// Produces a [`Task`] that queries the visible screen bounds of the
 /// [`Container`] with the given [`Id`].
-pub fn visible_bounds(id: Id) -> Command<Option<Rectangle>> {
+pub fn visible_bounds(id: Id) -> Task<Option<Rectangle>> {
     struct VisibleBounds {
         target: widget::Id,
         depth: usize,
@@ -545,7 +538,7 @@ pub fn visible_bounds(id: Id) -> Command<Option<Rectangle>> {
         }
     }
 
-    Command::widget(VisibleBounds {
+    Task::widget(VisibleBounds {
         target: id.into(),
         depth: 0,
         scrollables: Vec::new(),