widget/toplevel_item: Rename to size_cross_nth; take index argument

Name is a bit awkward, but useful for other purposes.

src/view/mod.rs

@@ -327,7 +327,7 @@ fn toplevel_preview(toplevel: &Toplevel, is_being_dragged: bool) -> cosmic::Elem
     }
     .align_y(iced::Alignment::Center);
     let alpha = if is_being_dragged { 0.5 } else { 1.0 };
-    crate::widgets::toplevel_item(
+    crate::widgets::size_cross_nth(
         vec![
             row![
                 widget::button::custom(label)
@@ -368,6 +368,7 @@ fn toplevel_preview(toplevel: &Toplevel, is_being_dragged: bool) -> cosmic::Elem
                 .into(),
         ],
         Axis::Vertical,
+        1, // Allocate width to match capture image
     )
     //.spacing(4)
     //.align_items(iced::Alignment::Center)

src/widgets/mod.rs

@@ -12,8 +12,8 @@ use std::marker::PhantomData;
 mod image_bg;
 mod workspace_bar;
 pub use workspace_bar::workspace_bar;
-mod toplevel_item;
-pub use toplevel_item::toplevel_item;
+mod size_cross_nth;
+pub use size_cross_nth::size_cross_nth;
 mod mouse_interaction_wrapper;
 mod toplevels;
 pub use toplevels::toplevels;

src/widgets/size_cross_nth.rs

@@ -1,6 +1,4 @@
-// combine widgets
-// Hack: this widget defines it's width as the second child's width
-// So the width of the image will be the overall width.
+// This widget defines it's cross axis size as the `index`th child's size
 
 use cosmic::iced::{
     advanced::{
@@ -44,21 +42,27 @@ impl AxisExt for Axis {
     }
 }
 
-pub fn toplevel_item<Msg>(children: Vec<cosmic::Element<Msg>>, axis: Axis) -> ToplevelItem<Msg> {
-    ToplevelItem {
+pub fn size_cross_nth<Msg>(
+    children: Vec<cosmic::Element<Msg>>,
+    axis: Axis,
+    index: usize,
+) -> SizeCrossNth<Msg> {
+    SizeCrossNth {
         axis,
         children,
+        index,
         _msg: PhantomData,
     }
 }
 
-pub struct ToplevelItem<'a, Msg> {
+pub struct SizeCrossNth<'a, Msg> {
     axis: Axis,
     children: Vec<cosmic::Element<'a, Msg>>,
+    index: usize,
     _msg: PhantomData<Msg>,
 }
 
-impl<Msg> Widget<Msg, cosmic::Theme, cosmic::Renderer> for ToplevelItem<'_, Msg> {
+impl<Msg> Widget<Msg, cosmic::Theme, cosmic::Renderer> for SizeCrossNth<'_, Msg> {
     fn size(&self) -> Size<Length> {
         Size {
             // width: Length::Fill
@@ -83,10 +87,11 @@ impl<Msg> Widget<Msg, cosmic::Theme, cosmic::Renderer> for ToplevelItem<'_, Msg>
         // Get layout of main widget, to set overall cross axis size
         let (max_width, max_height) = self.axis.pack(max_main, max_cross);
         let child_limits = layout::Limits::new(Size::ZERO, Size::new(max_width, max_height));
-        let layout =
-            self.children[1]
-                .as_widget()
-                .layout(&mut tree.children[1], renderer, &child_limits);
+        let layout = self.children[self.index].as_widget().layout(
+            &mut tree.children[self.index],
+            renderer,
+            &child_limits,
+        );
 
         let max_cross = self.axis.cross(layout.size());
 
@@ -220,8 +225,8 @@ impl<Msg> Widget<Msg, cosmic::Theme, cosmic::Renderer> for ToplevelItem<'_, Msg>
     }
 }
 
-impl<'a, Msg: 'static> From<ToplevelItem<'a, Msg>> for cosmic::Element<'a, Msg> {
-    fn from(widget: ToplevelItem<'a, Msg>) -> Self {
+impl<'a, Msg: 'static> From<SizeCrossNth<'a, Msg>> for cosmic::Element<'a, Msg> {
+    fn from(widget: SizeCrossNth<'a, Msg>) -> Self {
         cosmic::Element::new(widget)
     }
 }