egui_dock 0.19.1

Docking system for egui - an immediate-mode GUI library for Rust
Documentation 
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use egui::{Sense, Ui};

use crate::{
    dock_area::{
        drag_and_drop::{HoverData, TreeComponent},
        state::State,
    },
    DockArea, SurfaceIndex, TabViewer,
};

impl<Tab> DockArea<'_, Tab> {
    pub(super) fn show_root_surface_inside(
        &mut self,
        ui: &mut Ui,
        tab_viewer: &mut impl TabViewer<Tab = Tab>,
        state: &mut State,
    ) {
        let surf_index = SurfaceIndex::main();

        if self.dock_state.main_surface().is_empty() {
            let rect = ui.available_rect_before_wrap();
            let response = ui.allocate_rect(rect, Sense::hover());
            if response.contains_pointer() {
                ui.memory_mut(|mem| {
                    mem.data.insert_temp(
                        self.id.with("hover_data"),
                        Some(HoverData {
                            rect,
                            dst: TreeComponent::Surface(surf_index),
                            tab: None,
                        }),
                    );
                });
            }
            return;
        }

        self.render_nodes(ui, tab_viewer, state, surf_index, None);
    }
}