Implement Widget::operate for PaneGrid

native/src/widget/pane_grid.rs

@@ -38,6 +38,7 @@ use crate::mouse;
 use crate::overlay;
 use crate::renderer;
 use crate::touch;
+use crate::widget;
 use crate::widget::container;
 use crate::widget::tree::{self, Tree};
 use crate::{
@@ -289,6 +290,23 @@ where
         )
     }
 
+    fn operate(
+        &self,
+        tree: &mut Tree,
+        layout: Layout<'_>,
+        operation: &mut dyn widget::Operation<Message>,
+    ) {
+        operation.container(None, &mut |operation| {
+            self.contents
+                .iter()
+                .zip(&mut tree.children)
+                .zip(layout.children())
+                .for_each(|(((_pane, content), state), layout)| {
+                    content.operate(state, layout, operation);
+                })
+        });
+    }
+
     fn on_event(
         &mut self,
         tree: &mut Tree,

native/src/widget/pane_grid/content.rs

@@ -5,7 +5,7 @@ use crate::overlay;
 use crate::renderer;
 use crate::widget::container;
 use crate::widget::pane_grid::{Draggable, TitleBar};
-use crate::widget::Tree;
+use crate::widget::{self, Tree};
 use crate::{Clipboard, Element, Layout, Point, Rectangle, Shell, Size};
 
 /// The content of a [`Pane`].
@@ -183,6 +183,33 @@ where
         }
     }
 
+    pub(crate) fn operate(
+        &self,
+        tree: &mut Tree,
+        layout: Layout<'_>,
+        operation: &mut dyn widget::Operation<Message>,
+    ) {
+        let body_layout = if let Some(title_bar) = &self.title_bar {
+            let mut children = layout.children();
+
+            title_bar.operate(
+                &mut tree.children[1],
+                children.next().unwrap(),
+                operation,
+            );
+
+            children.next().unwrap()
+        } else {
+            layout
+        };
+
+        self.body.as_widget().operate(
+            &mut tree.children[0],
+            body_layout,
+            operation,
+        );
+    }
+
     pub(crate) fn on_event(
         &mut self,
         tree: &mut Tree,

native/src/widget/pane_grid/title_bar.rs

@@ -4,7 +4,7 @@ use crate::mouse;
 use crate::overlay;
 use crate::renderer;
 use crate::widget::container;
-use crate::widget::Tree;
+use crate::widget::{self, Tree};
 use crate::{
     Clipboard, Element, Layout, Padding, Point, Rectangle, Shell, Size,
 };
@@ -257,6 +257,44 @@ where
         layout::Node::with_children(node.size().pad(self.padding), vec![node])
     }
 
+    pub(crate) fn operate(
+        &self,
+        tree: &mut Tree,
+        layout: Layout<'_>,
+        operation: &mut dyn widget::Operation<Message>,
+    ) {
+        let mut children = layout.children();
+        let padded = children.next().unwrap();
+
+        let mut children = padded.children();
+        let title_layout = children.next().unwrap();
+        let mut show_title = true;
+
+        if let Some(controls) = &self.controls {
+            let controls_layout = children.next().unwrap();
+
+            if title_layout.bounds().width + controls_layout.bounds().width
+                > padded.bounds().width
+            {
+                show_title = false;
+            }
+
+            controls.as_widget().operate(
+                &mut tree.children[1],
+                controls_layout,
+                operation,
+            )
+        };
+
+        if show_title {
+            self.content.as_widget().operate(
+                &mut tree.children[0],
+                title_layout,
+                operation,
+            )
+        }
+    }
+
     pub(crate) fn on_event(
         &mut self,
         tree: &mut Tree,