Adanos020 · Adanos020 · Aug 27, 2023 · Aug 27, 2023 · Aug 27, 2023 · Aug 27, 2023
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -73,7 +73,8 @@ provide a guide of how to use the library.
   - Renamed `Style::border` to `Style::main_surface_border_stroke`.
   - Moved `Style::selection_color` to `OverlayStyle::selection_color`.
   - `DockArea::new` now takes in a `DockState` instead of a `Tree`.
-- Removed `DockArea::scroll_area_in_tabs`. (([#160](https://github.com/Adanos020/egui_dock/pull/160)))
+- Removed `DockArea::scroll_area_in_tabs`. ([#160](https://github.com/Adanos020/egui_dock/pull/160))
+- `TabViewer::{context_menu,on_add,add_popup}` now take in an additional `SurfaceIndex` parameter. ([#167](https://github.com/Adanos020/egui_dock/pull/167))
 
 ## 0.6.3 - 2023-06-16
 

diff --git a/examples/hello.rs b/examples/hello.rs
@@ -85,6 +85,10 @@ struct MyApp {
 impl TabViewer for MyContext {
     type Tab = String;
 
+    fn title(&mut self, tab: &mut Self::Tab) -> WidgetText {
+        tab.as_str().into()
+    }
+
     fn ui(&mut self, ui: &mut Ui, tab: &mut Self::Tab) {
         match tab.as_str() {
             "Simple Demo" => self.simple_demo(ui),
@@ -95,7 +99,13 @@ impl TabViewer for MyContext {
         }
     }
 
-    fn context_menu(&mut self, ui: &mut Ui, tab: &mut Self::Tab, _node: NodeIndex) {
+    fn context_menu(
+        &mut self,
+        ui: &mut Ui,
+        tab: &mut Self::Tab,
+        _surface: SurfaceIndex,
+        _node: NodeIndex,
+    ) {
         match tab.as_str() {
             "Simple Demo" => self.simple_demo_menu(ui),
             _ => {
@@ -105,10 +115,6 @@ impl TabViewer for MyContext {
         }
     }
 
-    fn title(&mut self, tab: &mut Self::Tab) -> WidgetText {
-        tab.as_str().into()
-    }
-
     fn closeable(&mut self, tab: &mut Self::Tab) -> bool {
         ["Inspector", "Style Editor"].contains(&tab.as_str())
     }

diff --git a/examples/reject_windows.rs b/examples/reject_windows.rs
@@ -24,6 +24,10 @@ struct OpinionatedTab {
 impl egui_dock::TabViewer for TabViewer {
     type Tab = OpinionatedTab;
 
+    fn title(&mut self, tab: &mut Self::Tab) -> egui::WidgetText {
+        (&tab.title).into()
+    }
+
     fn ui(&mut self, ui: &mut egui::Ui, tab: &mut Self::Tab) {
         ui.label(&tab.content);
         match &mut tab.can_become_window {
@@ -43,10 +47,6 @@ impl egui_dock::TabViewer for TabViewer {
         }
     }
 
-    fn title(&mut self, tab: &mut Self::Tab) -> egui::WidgetText {
-        (&tab.title).into()
-    }
-
     fn allowed_in_windows(&self, tab: &mut Self::Tab) -> bool {
         match tab.can_become_window {
             Ok(opinion) | Err(opinion) => opinion,

diff --git a/examples/simple.rs b/examples/simple.rs
@@ -18,13 +18,13 @@ struct TabViewer {}
 impl egui_dock::TabViewer for TabViewer {
     type Tab = String;
 
-    fn ui(&mut self, ui: &mut egui::Ui, tab: &mut Self::Tab) {
-        ui.label(format!("Content of {tab}"));
-    }
-
     fn title(&mut self, tab: &mut Self::Tab) -> egui::WidgetText {
         (&*tab).into()
     }
+
+    fn ui(&mut self, ui: &mut egui::Ui, tab: &mut Self::Tab) {
+        ui.label(format!("Content of {tab}"));
+    }
 }
 
 struct MyApp {

diff --git a/examples/tab_add.rs b/examples/tab_add.rs
@@ -2,7 +2,7 @@
 
 use eframe::{egui, NativeOptions};
 
-use egui_dock::{DockArea, DockState, NodeIndex, Style};
+use egui_dock::{DockArea, DockState, NodeIndex, Style, SurfaceIndex};
 
 fn main() -> eframe::Result<()> {
     let options = NativeOptions::default();
@@ -14,22 +14,22 @@ fn main() -> eframe::Result<()> {
 }
 
 struct TabViewer<'a> {
-    added_nodes: &'a mut Vec<NodeIndex>,
+    added_nodes: &'a mut Vec<(SurfaceIndex, NodeIndex)>,
 }
 
 impl egui_dock::TabViewer for TabViewer<'_> {
     type Tab = usize;
 
-    fn ui(&mut self, ui: &mut egui::Ui, tab: &mut Self::Tab) {
-        ui.label(format!("Content of tab {tab}"));
-    }
-
     fn title(&mut self, tab: &mut Self::Tab) -> egui::WidgetText {
         format!("Tab {tab}").into()
     }
 
-    fn on_add(&mut self, node: NodeIndex) {
-        self.added_nodes.push(node);
+    fn ui(&mut self, ui: &mut egui::Ui, tab: &mut Self::Tab) {
+        ui.label(format!("Content of tab {tab}"));
+    }
+
+    fn on_add(&mut self, surface: SurfaceIndex, node: NodeIndex) {
+        self.added_nodes.push((surface, node));
     }
 }
 
@@ -70,8 +70,8 @@ impl eframe::App for MyApp {
                 },
             );
 
-        added_nodes.drain(..).for_each(|node| {
-            self.tree.main_surface_mut().set_focused_node(node);
+        added_nodes.drain(..).for_each(|(surface, node)| {
+            self.tree.set_focused_node_and_surface((surface, node));
             self.tree.push_to_focused_leaf(self.counter);
             self.counter += 1;
         });

diff --git a/examples/tab_add_popup.rs b/examples/tab_add_popup.rs
@@ -3,7 +3,7 @@
 use eframe::{egui, NativeOptions};
 
 use egui::{Color32, RichText};
-use egui_dock::{DockArea, DockState, NodeIndex, Style};
+use egui_dock::{DockArea, DockState, NodeIndex, Style, SurfaceIndex};
 
 fn main() -> eframe::Result<()> {
     let options = NativeOptions::default();
@@ -21,20 +21,24 @@ enum MyTabKind {
 
 struct MyTab {
     kind: MyTabKind,
+    surface: SurfaceIndex,
     node: NodeIndex,
 }
+
 impl MyTab {
-    fn regular(node_index: usize) -> Self {
+    fn regular(surface: SurfaceIndex, node: NodeIndex) -> Self {
         Self {
             kind: MyTabKind::Regular,
-            node: NodeIndex(node_index),
+            surface,
+            node,
         }
     }
 
-    fn fancy(node_index: usize) -> Self {
+    fn fancy(surface: SurfaceIndex, node: NodeIndex) -> Self {
         Self {
             kind: MyTabKind::Fancy,
-            node: NodeIndex(node_index),
+            surface,
+            node,
         }
     }
 
@@ -68,56 +72,68 @@ struct TabViewer<'a> {
 impl egui_dock::TabViewer for TabViewer<'_> {
     type Tab = MyTab;
 
-    fn ui(&mut self, ui: &mut egui::Ui, tab: &mut Self::Tab) {
-        ui.label(tab.content());
-    }
-
     fn title(&mut self, tab: &mut Self::Tab) -> egui::WidgetText {
         tab.title().into()
     }
 
-    fn add_popup(&mut self, ui: &mut egui::Ui, node: NodeIndex) {
+    fn ui(&mut self, ui: &mut egui::Ui, tab: &mut Self::Tab) {
+        ui.label(tab.content());
+    }
+
+    fn add_popup(&mut self, ui: &mut egui::Ui, surface: SurfaceIndex, node: NodeIndex) {
         ui.set_min_width(120.0);
         ui.style_mut().visuals.button_frame = false;
 
         if ui.button("Regular tab").clicked() {
-            self.added_nodes.push(MyTab::regular(node.0));
+            self.added_nodes.push(MyTab::regular(surface, node));
         }
 
         if ui.button("Fancy tab").clicked() {
-            self.added_nodes.push(MyTab::fancy(node.0));
+            self.added_nodes.push(MyTab::fancy(surface, node));
         }
     }
 }
 
 struct MyApp {
-    tree: DockState<MyTab>,
+    dock_state: DockState<MyTab>,
     counter: usize,
 }
 
 impl Default for MyApp {
     fn default() -> Self {
-        let mut tree = DockState::new(vec![MyTab::regular(1), MyTab::fancy(2)]);
+        let mut tree = DockState::new(vec![
+            MyTab::regular(SurfaceIndex::main(), NodeIndex(1)),
+            MyTab::fancy(SurfaceIndex::main(), NodeIndex(2)),
+        ]);
 
         // You can modify the tree before constructing the dock
-        let [a, b] =
-            tree.main_surface_mut()
-                .split_left(NodeIndex::root(), 0.3, vec![MyTab::fancy(3)]);
-        let [_, _] = tree
-            .main_surface_mut()
-            .split_below(a, 0.7, vec![MyTab::fancy(4)]);
-        let [_, _] = tree
-            .main_surface_mut()
-            .split_below(b, 0.5, vec![MyTab::regular(5)]);
-
-        Self { tree, counter: 6 }
+        let [a, b] = tree.main_surface_mut().split_left(
+            NodeIndex::root(),
+            0.3,
+            vec![MyTab::fancy(SurfaceIndex::main(), NodeIndex(3))],
+        );
+        let [_, _] = tree.main_surface_mut().split_below(
+            a,
+            0.7,
+            vec![MyTab::fancy(SurfaceIndex::main(), NodeIndex(4))],
+        );
+        let [_, _] = tree.main_surface_mut().split_below(
+            b,
+            0.5,
+            vec![MyTab::regular(SurfaceIndex::main(), NodeIndex(5))],
+        );
+
+        Self {
+            dock_state: tree,
+            counter: 6,
+        }
     }
 }
 
 impl eframe::App for MyApp {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         let mut added_nodes = Vec::new();
-        DockArea::new(&mut self.tree)
+        DockArea::new(&mut self.dock_state)
             .show_add_buttons(true)
             .show_add_popup(true)
             .style(Style::from_egui(ctx.style().as_ref()))
@@ -129,9 +145,11 @@ impl eframe::App for MyApp {
             );
 
         added_nodes.drain(..).for_each(|node| {
-            self.tree.main_surface_mut().set_focused_node(node.node);
-            self.tree.push_to_focused_leaf(MyTab {
+            self.dock_state
+                .set_focused_node_and_surface((node.surface, node.node));
+            self.dock_state.push_to_focused_leaf(MyTab {
                 kind: node.kind,
+                surface: node.surface,
                 node: NodeIndex(self.counter),
             });
             self.counter += 1;

diff --git a/examples/text_editor.rs b/examples/text_editor.rs
@@ -23,16 +23,16 @@ struct Buffers {
 impl egui_dock::TabViewer for Buffers {
     type Tab = Title;
 
+    fn title(&mut self, title: &mut Title) -> egui::WidgetText {
+        egui::WidgetText::from(&*title)
+    }
+
     fn ui(&mut self, ui: &mut egui::Ui, title: &mut Title) {
         let text = self.buffers.entry(title.clone()).or_default();
         egui::TextEdit::multiline(text)
             .desired_width(f32::INFINITY)
             .show(ui);
     }
-
-    fn title(&mut self, title: &mut Title) -> egui::WidgetText {
-        egui::WidgetText::from(&*title)
-    }
 }
 
 struct MyApp {

diff --git a/src/widgets/dock_area/show/leaf.rs b/src/widgets/dock_area/show/leaf.rs
@@ -153,6 +153,7 @@ impl<'tree, Tab> DockArea<'tree, Tab> {
                 };
                 self.tab_plus(
                     ui,
+                    surface_index,
                     node_index,
                     tab_viewer,
                     tabbar_outer_rect,
@@ -307,7 +308,7 @@ impl<'tree, Tab> DockArea<'tree, Tab> {
 
                 if self.tab_context_menus {
                     response = response.context_menu(|ui| {
-                        tab_viewer.context_menu(ui, tab, node_index);
+                        tab_viewer.context_menu(ui, tab, surface_index, node_index);
                         if (surface_index.is_main() || !is_lonely_tab)
                             && ui.button("Eject").clicked()
                         {
@@ -394,9 +395,11 @@ impl<'tree, Tab> DockArea<'tree, Tab> {
         }
     }
 
+    #[allow(clippy::too_many_arguments)]
     fn tab_plus(
         &mut self,
         ui: &mut Ui,
+        surface_index: SurfaceIndex,
         node_index: NodeIndex,
         tab_viewer: &mut impl TabViewer<Tab = Tab>,
         tabbar_outer_rect: Rect,
@@ -452,14 +455,14 @@ impl<'tree, Tab> DockArea<'tree, Tab> {
 
         let popup_id = ui.id().with("tab_add_popup");
         popup_under_widget(ui, popup_id, &response, |ui| {
-            tab_viewer.add_popup(ui, node_index);
+            tab_viewer.add_popup(ui, surface_index, node_index);
         });
 
         if response.clicked() {
             if self.show_add_popup {
                 ui.memory_mut(|mem| mem.toggle_popup(popup_id));
             }
-            tab_viewer.on_add(node_index);
+            tab_viewer.on_add(surface_index, node_index);
         }
     }
 

diff --git a/src/widgets/tab_viewer.rs b/src/widgets/tab_viewer.rs
@@ -1,4 +1,4 @@
-use crate::{NodeIndex, TabStyle};
+use crate::{NodeIndex, SurfaceIndex, TabStyle};
 use egui::{Id, Ui, WidgetText};
 
 /// Defines how to display a tab inside a [`Tree`](crate::Tree).
@@ -14,9 +14,16 @@ pub trait TabViewer {
 
     /// Content inside the context menu shown when the tab is right-clicked.
     ///
-    /// The `_node` specifies which [`Node`](crate::Node) or split of the tree that this particular context menu
-    /// belongs to.
-    fn context_menu(&mut self, _ui: &mut Ui, _tab: &mut Self::Tab, _node: NodeIndex) {}
+    /// `_surface` and `_node` specify which [`Surface`](crate::Surface) and [`Node`](crate::Node) that this particular
+    /// context menu belongs to.
+    fn context_menu(
+        &mut self,
+        _ui: &mut Ui,
+        _tab: &mut Self::Tab,
+        _surface: SurfaceIndex,
+        _node: NodeIndex,
+    ) {
+    }
 
     /// Unique ID for this tab.
     ///
@@ -47,14 +54,15 @@ pub trait TabViewer {
     /// This is called when the tabs add button is pressed and if the dock [`Style`](crate::Style)'s
     /// `show_add_buttons` is set to `true`.
     ///
-    /// `_node` specifies which [`Node`](crate::Node) or split of the tree this particular add button was pressed on.
-    fn on_add(&mut self, _node: NodeIndex) {}
+    /// `_surface` and `_node` specify which surface and which [`Node`](crate::Node) this particular add button was
+    /// pressed on.
+    fn on_add(&mut self, _surface: SurfaceIndex, _node: NodeIndex) {}
 
     /// Content of the popup under the add button. Useful for selecting what type of tab to add.
     ///
     /// This requires that [`DockArea::show_add_buttons`](crate::DockArea::show_add_buttons) and
     /// [`DockArea::show_add_popup`](crate::DockArea::show_add_popup) are set to `true`.
-    fn add_popup(&mut self, _ui: &mut Ui, _node: NodeIndex) {}
+    fn add_popup(&mut self, _ui: &mut Ui, _surface: SurfaceIndex, _node: NodeIndex) {}
 
     /// This is called every frame after [`ui`](Self::ui) is called, if the `_tab` is active.
     ///