Add compact variant for pane grid controls

examples/pane_grid/src/main.rs

@@ -154,11 +154,23 @@ impl Example {
             .spacing(5);
 
             let title_bar = pane_grid::TitleBar::new(title)
-                .controls(view_controls(
-                    id,
-                    total_panes,
-                    pane.is_pinned,
-                    is_maximized,
+                .controls(pane_grid::Controls::dynamic(
+                    view_controls(
+                        id,
+                        total_panes,
+                        pane.is_pinned,
+                        is_maximized,
+                    ),
+                    button(text("X").size(14))
+                        .style(button::danger)
+                        .padding(3)
+                        .on_press_maybe(
+                            if total_panes > 1 && !pane.is_pinned {
+                                Some(Message::Close(id))
+                            } else {
+                                None
+                            },
+                        ),
                 ))
                 .padding(10)
                 .style(if is_focused {

widget/src/pane_grid.rs

@@ -10,6 +10,7 @@
 mod axis;
 mod configuration;
 mod content;
+mod controls;
 mod direction;
 mod draggable;
 mod node;
@@ -22,6 +23,7 @@ pub mod state;
 pub use axis::Axis;
 pub use configuration::Configuration;
 pub use content::Content;
+pub use controls::Controls;
 pub use direction::Direction;
 pub use draggable::Draggable;
 pub use node::Node;

widget/src/pane_grid/controls.rs

@@ -0,0 +1,59 @@
+use crate::container;
+use crate::core::{self, Element};
+
+/// The controls of a [`Pane`].
+///
+/// [`Pane`]: super::Pane
+#[allow(missing_debug_implementations)]
+pub struct Controls<
+    'a,
+    Message,
+    Theme = crate::Theme,
+    Renderer = crate::Renderer,
+> where
+    Theme: container::Catalog,
+    Renderer: core::Renderer,
+{
+    pub(super) full: Element<'a, Message, Theme, Renderer>,
+    pub(super) compact: Option<Element<'a, Message, Theme, Renderer>>,
+}
+
+impl<'a, Message, Theme, Renderer> Controls<'a, Message, Theme, Renderer>
+where
+    Theme: container::Catalog,
+    Renderer: core::Renderer,
+{
+    /// Creates a new [`Controls`] with the given content.
+    pub fn new(
+        content: impl Into<Element<'a, Message, Theme, Renderer>>,
+    ) -> Self {
+        Self {
+            full: content.into(),
+            compact: None,
+        }
+    }
+
+    /// Creates a new [`Controls`] with a full and compact variant.
+    /// If there is not enough room to show the full variant without overlap,
+    /// then the compact variant will be shown instead.
+    pub fn dynamic(
+        full: impl Into<Element<'a, Message, Theme, Renderer>>,
+        compact: impl Into<Element<'a, Message, Theme, Renderer>>,
+    ) -> Self {
+        Self {
+            full: full.into(),
+            compact: Some(compact.into()),
+        }
+    }
+}
+
+impl<'a, Message, Theme, Renderer> From<Element<'a, Message, Theme, Renderer>>
+    for Controls<'a, Message, Theme, Renderer>
+where
+    Theme: container::Catalog,
+    Renderer: core::Renderer,
+{
+    fn from(value: Element<'a, Message, Theme, Renderer>) -> Self {
+        Self::new(value)
+    }
+}