Add compact variant for pane grid controls

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)
+    }
+}