fix: headerbar and multi-window example improvements

examples/multi-window/src/window.rs

@@ -1,11 +1,11 @@
 use std::collections::HashMap;
 
 use cosmic::{
-    app::Core,
+    app::{command::message::cosmic, Core},
     iced::{self, event, window},
     iced_core::{id, Alignment, Length, Point},
     iced_widget::{column, scrollable, text, text_input},
-    widget::{button, container},
+    widget::{button, container, cosmic_container},
     Command,
 };
 
@@ -132,14 +132,13 @@ impl cosmic::Application for MultiWindow {
 
         let new_window_button = button(text("New Window")).on_press(Message::NewWindow);
 
-        let content = scrollable(
-            column![input, new_window_button]
-                .spacing(50)
-                .width(Length::Fill)
-                .align_items(Alignment::Center),
-        );
+        let content = column![input, new_window_button]
+            .spacing(50)
+            .width(Length::Fill)
+            .align_items(Alignment::Center);
 
-        container(container(content).width(200).center_x())
+        cosmic_container::container(container(content).width(200).center_x())
+            .style(cosmic::style::Container::Background)
             .width(Length::Fill)
             .height(Length::Fill)
             .center_x()
@@ -147,12 +146,6 @@ impl cosmic::Application for MultiWindow {
             .into()
     }
 
-    fn style(
-        &self,
-    ) -> Option<<cosmic::Theme as cosmic::iced_style::application::StyleSheet>::Style> {
-        Some(Default::default())
-    }
-
     fn view(&self) -> cosmic::prelude::Element<Self::Message> {
         self.view_window(window::Id::MAIN)
     }

src/app/settings.rs

@@ -95,7 +95,7 @@ impl Default for Settings {
             #[cfg(feature = "wayland")]
             size_limits: Limits::NONE.min_height(1.0).min_width(1.0),
             theme: crate::theme::system_preference(),
-            transparent: false,
+            transparent: true,
             exit_on_close: true,
         }
     }

src/theme/style/iced.rs

@@ -392,7 +392,7 @@ impl container::StyleSheet for Theme {
                     icon_color: Some(Color::from(palette.accent.base)),
                     text_color: Some(Color::from(palette.background.on)),
                     background: Some(iced::Background::Gradient(iced_core::Gradient::Linear(
-                        Linear::new(Radians(3.0 * PI / 2.0))
+                        Linear::new(Radians(PI))
                             .add_stop(0.0, header_top.into())
                             .add_stop(1.0, header_bottom.into()),
                     ))),