Draft first-class TitleBar in pane_grid

native/src/widget/pane_grid/content.rs

@@ -1,30 +1,88 @@
-use crate::pane_grid::Axis;
+use crate::layout;
+use crate::pane_grid::{self, TitleBar};
+use crate::{Clipboard, Element, Event, Hasher, Layout, Point};
 
-/// The content of a [`PaneGrid`].
+/// The content of a [`Pane`].
 ///
-/// [`PaneGrid`]: struct.PaneGrid.html
-#[derive(Debug, Clone)]
-pub enum Content<T> {
-    /// A split of the available space.
-    Split {
-        /// The direction of the split.
-        axis: Axis,
-
-        /// The ratio of the split in [0.0, 1.0].
-        ratio: f32,
-
-        /// The left/top [`Content`] of the split.
-        ///
-        /// [`Content`]: enum.Node.html
-        a: Box<Content<T>>,
-
-        /// The right/bottom [`Content`] of the split.
-        ///
-        /// [`Content`]: enum.Node.html
-        b: Box<Content<T>>,
-    },
-    /// A [`Pane`].
-    ///
-    /// [`Pane`]: struct.Pane.html
-    Pane(T),
+/// [`Pane`]: struct.Pane.html
+pub struct Content<'a, Message, Renderer> {
+    title_bar: Option<TitleBar<'a, Message, Renderer>>,
+    body: Element<'a, Message, Renderer>,
+}
+
+impl<'a, Message, Renderer> Content<'a, Message, Renderer> {
+    pub fn new(body: impl Into<Element<'a, Message, Renderer>>) -> Self {
+        Self {
+            title_bar: None,
+            body: body.into(),
+        }
+    }
+
+    pub fn title_bar(
+        mut self,
+        title_bar: TitleBar<'a, Message, Renderer>,
+    ) -> Self {
+        self.title_bar = Some(title_bar);
+        self
+    }
+}
+
+impl<'a, Message, Renderer> Content<'a, Message, Renderer>
+where
+    Renderer: pane_grid::Renderer,
+{
+    pub fn draw(
+        &self,
+        renderer: &mut Renderer,
+        defaults: &Renderer::Defaults,
+        layout: Layout<'_>,
+        cursor_position: Point,
+    ) -> Renderer::Output {
+        renderer.draw_pane(
+            defaults,
+            self.title_bar.as_ref(),
+            &self.body,
+            layout,
+            cursor_position,
+        )
+    }
+
+    pub(crate) fn is_over_drag_target(
+        &self,
+        _layout: Layout<'_>,
+        _cursor_position: Point,
+    ) -> bool {
+        false
+    }
+
+    pub(crate) fn layout(
+        &self,
+        renderer: &Renderer,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        self.body.layout(renderer, limits)
+    }
+
+    pub(crate) fn on_event(
+        &mut self,
+        event: Event,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        messages: &mut Vec<Message>,
+        renderer: &Renderer,
+        clipboard: Option<&dyn Clipboard>,
+    ) {
+        self.body.on_event(
+            event,
+            layout,
+            cursor_position,
+            messages,
+            renderer,
+            clipboard,
+        )
+    }
+
+    pub(crate) fn hash_layout(&self, state: &mut Hasher) {
+        self.body.hash_layout(state);
+    }
 }