Refactor: TabViewer

examples/text_editor.rs

@@ -0,0 +1,86 @@
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+
+use std::collections::BTreeMap;
+
+use eframe::{egui, NativeOptions};
+
+/// We identify tabs by the title of the file we are editing.
+type Title = String;
+
+fn main() {
+    let options = NativeOptions::default();
+    eframe::run_native(
+        "Text editor examples",
+        options,
+        Box::new(|_cc| Box::new(MyApp::default())),
+    );
+}
+
+struct Buffers {
+    buffers: BTreeMap<Title, String>,
+}
+
+impl egui_dock::TabViewer for Buffers {
+    type Tab = 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 {
+    buffers: Buffers,
+    tree: egui_dock::Tree<String>,
+}
+
+impl Default for MyApp {
+    fn default() -> Self {
+        let mut buffers = BTreeMap::default();
+        buffers.insert(
+            "CHANGELOG.md".to_owned(),
+            include_str!("../CHANGELOG.md").to_owned(),
+        );
+        buffers.insert("LICENSE".to_owned(), include_str!("../LICENSE").to_owned());
+        buffers.insert(
+            "README.md".to_owned(),
+            include_str!("../README.md").to_owned(),
+        );
+
+        let tree = egui_dock::Tree::new(vec!["README.md".to_owned(), "CHANGELOG.md".to_owned()]);
+
+        Self {
+            buffers: Buffers { buffers },
+            tree,
+        }
+    }
+}
+
+impl eframe::App for MyApp {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::SidePanel::left("documents").show(ctx, |ui| {
+            for title in self.buffers.buffers.keys() {
+                let tab_location = self.tree.find_tab(title);
+                let is_open = tab_location.is_some();
+                if ui.selectable_label(is_open, title).clicked() {
+                    if let Some((node_index, tab_index)) = tab_location {
+                        self.tree.set_active_tab(node_index, tab_index);
+                    } else {
+                        // Open the file for editing:
+                        self.tree.push_to_focused_leaf(title.clone());
+                    }
+                }
+            }
+        });
+
+        egui_dock::DockArea::new(&mut self.tree)
+            .style(egui_dock::Style::from_egui(ctx.style().as_ref()))
+            .show(ctx, &mut self.buffers);
+    }
+}

examples/traits.rs

@@ -6,7 +6,7 @@ use egui::{
     Window,
 };
 
-use egui_dock::{DockArea, NodeIndex, Tab, TabBuilder, Tree};
+use egui_dock::{DockArea, NodeIndex, TabBuilder, TabTrait, Tree};
 
 fn main() {
     let options = NativeOptions::default();
@@ -100,7 +100,7 @@ impl Editor {
     }
 }
 
-impl Tab for Editor {
+impl TabTrait for Editor {
     fn ui(&mut self, ui: &mut Ui) {
         if self.show_save {
             Window::new("Save")