feat(flex-row): add justify_content method

src/widget/flex_row/layout.rs

@@ -8,7 +8,7 @@ use iced_core::{Length, Padding, Point, Size};
 use taffy::geometry::Rect;
 use taffy::style::{AlignItems, Dimension, Display, Style};
 use taffy::style_helpers::length;
-use taffy::TaffyTree;
+use taffy::{AlignContent, TaffyTree};
 
 #[allow(clippy::too_many_lines)]
 pub fn resolve<Message>(
@@ -18,6 +18,7 @@ pub fn resolve<Message>(
     padding: Padding,
     column_spacing: f32,
     row_spacing: f32,
+    justify_content: Option<AlignContent>,
     tree: &mut [Tree],
 ) -> Node {
     let limits = limits.shrink(padding);
@@ -43,6 +44,8 @@ pub fn resolve<Message>(
             height: Dimension::Auto,
         },
 
+        justify_content,
+
         padding: Rect {
             left: length(padding.left),
             right: length(padding.right),

src/widget/flex_row/widget.rs

@@ -27,6 +27,9 @@ pub struct FlexRow<'a, Message> {
     width: Length,
     /// Sets the max width
     max_width: f32,
+    /// Defines how the content will be justified.
+    #[setters(into)]
+    justify_content: Option<crate::widget::JustifyContent>,
 }
 
 impl<'a, Message> FlexRow<'a, Message> {
@@ -38,6 +41,7 @@ impl<'a, Message> FlexRow<'a, Message> {
             row_spacing: 4,
             width: Length::Shrink,
             max_width: f32::INFINITY,
+            justify_content: None,
         }
     }
 
@@ -83,6 +87,7 @@ impl<'a, Message: 'static + Clone> Widget<Message, crate::Theme, Renderer>
             self.padding,
             f32::from(self.column_spacing),
             f32::from(self.row_spacing),
+            self.justify_content,
             &mut tree.children,
         )
     }

src/widget/mod.rs

@@ -231,6 +231,8 @@ pub use icon::{icon, Icon};
 #[cfg(feature = "animated-image")]
 pub mod frames;
 
+pub use taffy::JustifyContent;
+
 pub mod list;
 #[doc(inline)]
 pub use list::{list_column, ListColumn};