### Get Tabs from Node (Example)

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node/enum.Node.html

Demonstrates how to check if a specific tab exists within the root node's leaf.

```rust
let mut dock_state = DockState::new(vec![1, 2, 3, 4, 5, 6]);
assert!(dock_state.main_surface().root_node().unwrap().tabs().unwrap().contains(&4));
```

--------------------------------

### Example: Accessing the root node

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/tree/mod.rs.html

Shows how to get an immutable reference to the root node of a DockState and assert its contents. This is useful for verifying the initial state or reading information from the root.

```rust
# use egui_dock::DockState;
let mut dock_state = DockState::new(vec!["single tab"]);
let root_node = dock_state.main_surface().root_node().unwrap();

assert_eq!(root_node.tabs(), Some(["single tab"].as_slice()));

```

--------------------------------

### Basic egui_dock Usage

Source: https://docs.rs/egui_dock/latest/egui_dock/index.html

Demonstrates the fundamental setup for egui_dock, including defining a tab type, implementing the TabViewer trait, and integrating DockArea with a DockState.

```rust
use egui_dock::{DockArea, DockState, NodeIndex, Style, TabViewer};
use egui::{Ui, WidgetText};

// First, let's pick a type that we'll use to attach some data to each tab.
// It can be any type.
type Tab = String;

// To define the contents and properties of individual tabs, we implement the `TabViewer`
// trait. Only three things are mandatory: the `Tab` associated type, and the `ui` and
// `title` methods. There are more methods in `TabViewer` which you can also override.
struct MyTabViewer;

impl TabViewer for MyTabViewer {
    // This associated type is used to attach some data to each tab.
    type Tab = Tab;

    // Returns the current `tab`'s title.
    fn title(&mut self, tab: &mut Self::Tab) -> WidgetText {
        tab.as_str().into()
    }

    // Defines the contents of a given `tab`.
    fn ui(&mut self, ui: &mut Ui, tab: &mut Self::Tab) {
        ui.label(format!("Content of {tab}"));
    }
}

// Here is a simple example of how you can manage a `DockState` of your application.
struct MyTabs {
    dock_state: DockState<Tab>
}

impl MyTabs {
    pub fn new() -> Self {
        // Create a `DockState` with an initial tab "tab1" in the main `Surface`'s root node.
        let tabs = ["tab1", "tab2", "tab3"].map(str::to_string).into_iter().collect();
        let dock_state = DockState::new(tabs);
        Self { dock_state }
    }

    fn ui(&mut self, ui: &mut Ui) {
        // Here we just display the `DockState` using a `DockArea`.
        // This is where egui handles rendering and all the integrations.
        //
        // We can specify a custom `Style` for the `DockArea`, or just inherit
        // all of it from egui.
        DockArea::new(&mut self.dock_state)
            .style(Style::from_egui(ui.style().as_ref()))
            .show_inside(ui, &mut MyTabViewer);
    }
}

```

--------------------------------

### Basic egui_dock Usage with TabViewer

Source: https://docs.rs/egui_dock/latest/egui_dock

Demonstrates the fundamental setup for egui_dock, including defining a tab type, implementing the TabViewer trait, and integrating DockArea with a DockState.

```rust
use egui_dock::{DockArea, DockState, Style, TabViewer};
use egui::{Ui, WidgetText};

// First, let's pick a type that we'll use to attach some data to each tab.
// It can be any type.
type Tab = String;

// To define the contents and properties of individual tabs, we implement the `TabViewer`
// trait. Only three things are mandatory: the `Tab` associated type, and the `ui` and
// `title` methods. There are more methods in `TabViewer` which you can also override.
struct MyTabViewer;

impl TabViewer for MyTabViewer {
    // This associated type is used to attach some data to each tab.
    type Tab = Tab;

    // Returns the current `tab`'s title.
    fn title(&mut self, tab: &mut Self::Tab) -> WidgetText {
        tab.as_str().into()
    }

    // Defines the contents of a given `tab`.
    fn ui(&mut self, ui: &mut Ui, tab: &mut Self::Tab) {
        ui.label(format!("Content of {tab}"));
    }
}

// Here is a simple example of how you can manage a `DockState` of your application.
struct MyTabs {
    dock_state: DockState<Tab>
}

impl MyTabs {
    pub fn new() -> Self {
        // Create a `DockState` with an initial tab "tab1" in the main `Surface`'s root node.
        let tabs = ["tab1", "tab2", "tab3"].map(str::to_string).into_iter().collect();
        let dock_state = DockState::new(tabs);
        Self { dock_state }
    }

    fn ui(&mut self, ui: &mut Ui) {
        // Here we just display the `DockState` using a `DockArea`.
        // This is where egui handles rendering and all the integrations.
        //
        // We can specify a custom `Style` for the `DockArea`, or just inherit
        // all of it from egui.
        DockArea::new(&mut self.dock_state)
            .style(Style::from_egui(ui.style().as_ref()))
            .show_inside(ui, &mut MyTabViewer);
    }
}

```

--------------------------------

### DockArea::new

Source: https://docs.rs/egui_dock/latest/egui_dock/widgets/dock_area/struct.DockArea.html

Creates a new DockArea from a mutable reference to a DockState. This is the starting point for configuring and displaying a docking layout.

```APIDOC
## DockArea::new

### Description
Creates a new `DockArea` from the provided `DockState`.

### Signature
```rust
pub fn new(tree: &'tree mut DockState<Tab>) -> DockArea<'tree, Tab>
```
```

--------------------------------

### Split Tree from Root Node

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node_index/struct.NodeIndex.html

Demonstrates splitting the main surface of a DockState. This example shows how to use NodeIndex::root() to target the main node for splitting.

```rust
let mut dock_state = DockState::new(vec!["tab 1", "tab 2"]);
let _ = dock_state.main_surface_mut().split_left(NodeIndex::root(), 0.5, vec!["tab 3", "tab 4"]);
```

--------------------------------

### Append Tab to Node (Example)

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node/enum.Node.html

Demonstrates adding a new tab to an existing leaf node and verifying the updated tab count.

```rust
let mut dock_state = DockState::new(vec!["a tab"]);
assert_eq!(dock_state.main_surface().root_node().unwrap().tabs_count(), 1);

dock_state.main_surface_mut().root_node_mut().unwrap().append_tab("another tab");
assert_eq!(dock_state.main_surface().root_node().unwrap().tabs_count(), 2);
```

--------------------------------

### Create a new DockArea

Source: https://docs.rs/egui_dock/latest/egui_dock/widgets/dock_area/struct.DockArea.html

Instantiate a DockArea by providing a mutable reference to a DockState. This is the starting point for configuring and displaying the docking area.

```rust
DockArea::new(tree: &'tree mut DockState<Tab>) -> DockArea<'tree, Tab>
```

--------------------------------

### Example: Modifying the root node

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/tree/mod.rs.html

Demonstrates how to obtain a mutable reference to the root node and add a new tab to it. This allows for dynamic modification of the dock state's root.

```rust
# use egui_dock::{DockState, LeafNode};
let mut dock_state = DockState::new(vec!["single tab"]);
let root_node = dock_state.main_surface_mut().root_node_mut().unwrap();
let root_as_leaf = root_node.get_leaf_mut().unwrap();
root_as_leaf.tabs.push("partner tab");

assert_eq!(root_node.tabs(), Some(["single tab", "partner tab"].as_slice()));

```

--------------------------------

### Customize egui-dock Translations

Source: https://docs.rs/egui_dock/latest/src/egui_dock/lib.rs.html

Provides an example of how to define custom translations for UI elements within egui-dock, such as tab context menus and leaf node tooltips, for different languages.

```rust
# use egui_dock::{DockState, TabContextMenuTranslations, Translations, LeafTranslations};
# type Tab = ();
let translations_pl = Translations {
    tab_context_menu: TabContextMenuTranslations {
        close_button: "Zamknij zakładkę".to_string(),
        eject_button: "Przenieś zakładkę do nowego okna".to_string(),
    },
    leaf: LeafTranslations {
        close_button_disabled_tooltip: "Ten węzeł zawiera niezamykalne zakładki.".to_string(),
        close_all_button: "Zamknij okno".to_string(),
        close_all_button_menu_hint: "Kliknij prawym przyciskiem myszy, aby zamknąć to okno.".to_string(),
        close_all_button_modifier_hint: "Naciśnij klawisze modyfikujące (domyślnie Shift), aby zamknąć to okno.".to_string(),
        close_all_button_modifier_menu_hint: "Naciśnij klawisze modyfikujące (domyślnie Shift) lub kliknij prawym przyciskiem myszy, aby zamknąć to okno.".to_string(),
        close_all_button_disabled_tooltip: "To okno zawiera zakładki, których nie można zamknąć.".to_string(),
        minimize_button: "Zminimalizuj okno".to_string(),
        minimize_button_menu_hint: "Kliknij prawym przyciskiem myszy, aby zminimalizować to okno.".to_string(),
        minimize_button_modifier_hint: "Naciśnij klawisze modyfikujące (domyślnie Shift), aby zminimalizować to okno.".to_string(),
    },
};

```

--------------------------------

### Initialize and Customize egui_dock Style

Source: https://docs.rs/egui_dock/latest/egui_dock/style/struct.Style.html

Demonstrates how to initialize a Style by inheriting from egui's default style and then customizing specific fields before applying it to a DockArea.

```rust
// Inherit the look and feel from egui.
let mut style = Style::from_egui(ui.style());

// Modify a few fields.
style.overlay.overlay_type = OverlayType::HighlightedAreas;
style.buttons.add_tab_align = TabAddAlign::Left;

// Use the style with the `DockArea`.
DockArea::new(&mut dock_state)
    .style(style)
    .show_inside(ui, &mut MyTabViewer);
```

--------------------------------

### Manage DockState Windows

Source: https://docs.rs/egui_dock/latest/src/egui_dock/lib.rs.html

Demonstrates how to add a new window surface with a tab and then access and modify its position and size.

```rust
# use egui_dock::DockState;
# use egui::{Pos2, Vec2};
# let mut dock_state = DockState::new(vec![]);
// Create a new window `Surface` with one tab inside it.
let mut surface_index = dock_state.add_window(vec!["Window Tab".to_string()]);

// Access the window state by its surface index and then move and resize it.
let window_state = dock_state.get_window_state_mut(surface_index).unwrap();
window_state.set_position(Pos2::ZERO);
window_state.set_size(Vec2::splat(100.0));

```

--------------------------------

### NodeIndex Root Node Access

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/tree/node_index.rs.html

Provides a constant method to get the index of the root node, which is always 0. This is useful for operations starting from the top of the tree.

```rust
impl NodeIndex {
    /// Returns the index of the root node.
    ///
    /// In the context of a [`Tree`](crate::Tree), this will be the node that contains all other nodes.
    ///
    /// # Examples
    ///
    /// Splitting the current tree in two.
    /// ```rust
    /// # use egui_dock::{DockState, NodeIndex};
    /// let mut dock_state = DockState::new(vec!["tab 1", "tab 2"]);
    /// let _ = dock_state.main_surface_mut().split_left(NodeIndex::root(), 0.5, vec!["tab 3", "tab 4"]);
    /// ```
    #[inline(always)]
    pub const fn root() -> Self {
        Self(0)
    }
// ... other methods
```

--------------------------------

### Handling File Metadata with `and_then`

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/type.Result.html

Shows how to use `and_then` to chain operations that might fail, such as getting file metadata and then its modification time. This example highlights error propagation.

```rust
use std::{io::ErrorKind, path::Path};

// Note: on Windows "/" maps to "C:\\"
let root_modified_time = Path::new("/").metadata().and_then(|md| md.modified());
assert!(root_modified_time.is_ok());

let should_fail = Path::new("/bad/path").metadata().and_then(|md| md.modified());
assert!(should_fail.is_err());
assert_eq!(should_fail.unwrap_err().kind(), ErrorKind::NotFound);
```

--------------------------------

### Managing egui_dock Surfaces Programmatically

Source: https://docs.rs/egui_dock/latest/egui_dock/index.html

Demonstrates programmatic control over egui_dock surfaces, specifically creating a new window surface with a tab and then manipulating its position and size.

```rust
// Create a new window `Surface` with one tab inside it.
let mut surface_index = dock_state.add_window(vec!["Window Tab".to_string()]);

// Access the window state by its surface index and then move and resize it.
let window_state = dock_state.get_window_state_mut(surface_index).unwrap();
window_state.set_position(Pos2::ZERO);
window_state.set_size(Vec2::splat(100.0));

```

--------------------------------

### Get immutable slice of tabs from a Leaf node

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/tree/node/mod.rs.html

Use this method to get a read-only view of tabs within a Leaf node. Returns None if the node is not a Leaf.

```rust
/// Provides an immutable slice of the tabs inside this node.
///
/// Returns [`None`] if the node is not a [`Leaf`](Node::Leaf).
///
/// # Examples
///
/// ```rust
/// # use egui_dock::{DockState, NodeIndex};
/// let mut dock_state = DockState::new(vec![1, 2, 3, 4, 5, 6]);
/// assert!(dock_state.main_surface().root_node().unwrap().tabs().unwrap().contains(&4));
/// ```
#[inline]
pub fn tabs(&self) -> Option<&[Tab]> {
    match self {
        Node::Leaf(leaf) => Some(leaf.tabs()),
        _ => None,
    }
}
```

--------------------------------

### Example: Counting and manipulating tabs

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/tree/mod.rs.html

Demonstrates how to count the total number of tabs in a DockState, split panes to add new tabs, and remove leaf nodes to reduce the tab count.

```rust
# use egui_dock::{DockState, NodeIndex, TabIndex};
let mut dock_state = DockState::new(vec!["node 1", "node 2", "node 3"]);
assert_eq!(dock_state.main_surface().num_tabs(), 3);

let [a, b] = dock_state.main_surface_mut().split_left(NodeIndex::root(), 0.5, vec!["tab 4", "tab 5"]);
assert_eq!(dock_state.main_surface().num_tabs(), 5);

dock_state.main_surface_mut().remove_leaf(a);
assert_eq!(dock_state.main_surface().num_tabs(), 2);

```

--------------------------------

### Get mutable slice of tabs from a Leaf node

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/tree/node/mod.rs.html

Use this method to get a mutable view of tabs within a Leaf node, allowing modifications. Returns None if the node is not a Leaf.

```rust
/// Provides an mutable slice of the tabs inside this node.
///
/// Returns [`None`] if the node is not a [`Leaf`](Node::Leaf).
///
/// # Examples
///
/// Modifying tabs inside a node:
/// ```rust
/// # use egui_dock::{DockState, NodeIndex};
/// let mut dock_state = DockState::new(vec![1, 2, 3, 4, 5, 6]);
/// let mut tabs = dock_state
///     .main_surface_mut()
///     .root_node_mut()
///     .unwrap()
///     .tabs_mut()
///     .unwrap();
///
/// tabs[0] = 7;
/// tabs[5] = 8;
///
/// assert_eq!(&tabs, &[7, 2, 3, 4, 5, 8]);
/// ```
#[inline]
pub fn tabs_mut(&mut self) -> Option<&mut [Tab]> {
    match self {
        Node::Leaf(leaf) => Some(leaf.tabs_mut()),
        _ => None,
    }
}
```

--------------------------------

### type_id

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node/enum.Node.html

Gets the TypeId of the Node.

```APIDOC
## fn type_id(&self) -> TypeId

### Description
Gets the `TypeId` of `self`.
```

--------------------------------

### Basic egui_dock Usage with TabViewer

Source: https://docs.rs/egui_dock/latest/src/egui_dock/lib.rs.html

Demonstrates the fundamental setup for egui_dock, including defining a custom tab type, implementing the TabViewer trait for tab content and titles, and integrating DockState and DockArea into an egui application.

```rust
use egui_dock::{DockArea, DockState, NodeIndex, Style, TabViewer};
use egui::{Ui, WidgetText};

// First, let's pick a type that we'll use to attach some data to each tab.
// It can be any type.
type Tab = String;

// To define the contents and properties of individual tabs, we implement the `TabViewer`
// trait. Only three things are mandatory: the `Tab` associated type, and the `ui` and
// `title` methods. There are more methods in `TabViewer` which you can also override.
struct MyTabViewer;

impl TabViewer for MyTabViewer {
    // This associated type is used to attach some data to each tab.
    type Tab = Tab;

    // Returns the current `tab`'s title.
    fn title(&mut self, tab: &mut Self::Tab) -> WidgetText {
        tab.as_str().into()
    }

    // Defines the contents of a given `tab`.
    fn ui(&mut self, ui: &mut Ui, tab: &mut Self::Tab) {
        ui.label(format!("Content of {tab}"));
    }
}

// Here is a simple example of how you can manage a `DockState` of your application.
struct MyTabs {
    dock_state: DockState<Tab>
}

impl MyTabs {
    pub fn new() -> Self {
        // Create a `DockState` with an initial tab "tab1" in the main `Surface`'s root node.
        let tabs = ["tab1", "tab2", "tab3"].map(str::to_string).into_iter().collect();
        let dock_state = DockState::new(tabs);
        Self { dock_state }
    }

    fn ui(&mut self, ui: &mut Ui) {
        // Here we just display the `DockState` using a `DockArea`.
        // This is where egui handles rendering and all the integrations.
        //
        // We can specify a custom `Style` for the `DockArea`, or just inherit
        // all of it from egui.
        DockArea::new(&mut self.dock_state)
            .style(Style::from_egui(ui.style().as_ref()))
            .show_inside(ui, &mut MyTabViewer);
    }
}

# let mut my_tabs = MyTabs::new();
# egui::__run_test_ctx(|ctx| {
#     #[allow(deprecated)]
#     egui::CentralPanel::default().show(ctx, |ui| my_tabs.ui(ui));
# });

```

--------------------------------

### DockState::new

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/mod.rs.html

Creates a new DockState with a single main surface initialized with the provided tabs.

```APIDOC
## DockState::new

### Description
Create a new tree with given tabs at the main surface's root node.

### Signature
```rust
pub fn new(tabs: Vec<Tab>) -> Self
```

### Parameters
* `tabs` - A vector of `Tab` items to initialize the main surface with.
```

--------------------------------

### SplitNode::rect

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/tree/node/split.rs.html

Gets the bounding rectangle of the SplitNode.

```APIDOC
## SplitNode::rect

### Description
Retrieves the current bounding rectangle area that this ``SplitNode`` occupies.

### Signature
```rust
pub fn rect(&self) -> Rect
```

### Returns
* `Rect` - The bounding rectangle of the split node.
```

--------------------------------

### tabs_count

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node/enum.Node.html

Gets the number of tabs currently in the node.

```APIDOC
## pub fn tabs_count(&self) -> usize

### Description
Gets the number of tabs in the node.
```

--------------------------------

### Initialize DockState with Tabs

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/mod.rs.html

Creates a new DockState with a single main surface initialized with the provided tabs. Use this to set up the initial layout of your dockable areas.

```rust
pub fn new(tabs: Vec<Tab>) -> Self {
        Self {
            surfaces: vec![Surface::Main(Tree::new(tabs))],
            focused_surface: None,
            translations: Translations::english(),
        }
    }
```

--------------------------------

### get_surface

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/mod.rs.html

Gets an immutable reference to the raw Surface from a SurfaceIndex.

```APIDOC
## get_surface

### Description
Get an immutable borrow to the raw surface from a surface index.

### Signature
```rust
#[inline]
pub fn get_surface(&self, surface: SurfaceIndex) -> Option<&Surface<Tab>>
```

### Parameters
- **surface** (`SurfaceIndex`): The index of the surface to retrieve.

### Returns
- `Option<&Surface<Tab>>`: An immutable reference to the `Surface` if it exists, otherwise `None`.
```

--------------------------------

### get_surface_mut

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/mod.rs.html

Gets a mutable reference to the raw Surface from a SurfaceIndex.

```APIDOC
## get_surface_mut

### Description
Get a mutable borrow to the raw surface from a surface index.

### Signature
```rust
#[inline]
pub fn get_surface_mut(&mut self, surface: SurfaceIndex) -> Option<&mut Surface<Tab>>
```

### Parameters
- **surface** (`SurfaceIndex`): The index of the surface to retrieve.

### Returns
- `Option<&mut Surface<Tab>>`: A mutable reference to the `Surface` if it exists, otherwise `None`.
```

--------------------------------

### DockState::new

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/struct.DockState.html

Creates a new DockState with a given vector of tabs, initializing the main surface's root node.

```APIDOC
## DockState::new

### Description
Creates a new tree with given tabs at the main surface’s root node.

### Signature
```rust
pub fn new(tabs: Vec<Tab>) -> Self
```
```

--------------------------------

### node_tree_mut

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/surface/enum.Surface.html

Gets mutable access to the node tree of this surface.

```APIDOC
/// Get mutable access to the node tree of this surface.
pub fn node_tree_mut(&mut self) -> Option<&mut Tree<Tab>>
```

--------------------------------

### Show Root Surface Inside

Source: https://docs.rs/egui_dock/latest/src/egui_dock/widgets/dock_area/show/main_surface.rs.html

Renders the main surface of the dock area. If the main surface is empty, it allocates space and records hover data. Otherwise, it calls `render_nodes` to display the content.

```rust
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);
    }
}
```

--------------------------------

### Create egui::Window constructor

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/window_state.rs.html

Constructs an `egui::Window` with the current state, applying position, size, and expanded height if set. Resets the 'new' flag after construction. This is an internal method.

```rust
//the 'static in this case means that the `open` field is always `None`
pub(crate) fn create_window(&mut self, id: Id, bounds: Rect) -> egui::Window<'static> {
    let new = self.new;
    let mut window_constructor = egui::Window::new("")
        .id(id)
        .constrain_to(bounds)
        .title_bar(false);

    if let Some(position) = self.next_position() {
        window_constructor = window_constructor.current_pos(position);
    }
    if let Some(size) = self.next_size() {
        window_constructor = window_constructor.fixed_size(size);
    }
    // Reset the height of the window if it is now expanded
    if new {
        if let Some(height) = self.expanded_height() {
            window_constructor = window_constructor.max_height(height).min_height(height);
        }
    }
    self.new = false;
    window_constructor
}
```

--------------------------------

### node_tree

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/surface/enum.Surface.html

Gets immutable access to the node tree of this surface.

```APIDOC
/// Get access to the node tree of this surface.
pub fn node_tree(&self) -> Option<&Tree<Tab>>
```

--------------------------------

### Initialize new WindowState

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/window_state.rs.html

Provides a constructor for creating a new WindowState, defaulting to the struct's default values.

```rust
impl WindowState {
    /// Create a default window state.
    pub(crate) fn new() -> Self {
        Self::default()
    }
// ...
```

--------------------------------

### Get LeafNode Rectangle

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node/struct.LeafNode.html

Retrieves the screen area occupied by the LeafNode.

```rust
pub fn rect(&self) -> Rect>
```

--------------------------------

### Customize Translations for egui_dock

Source: https://docs.rs/egui_dock/latest/egui_dock

Customize UI text elements like tab context menus and leaf node tooltips. This example shows how to define translations for Polish and Japanese.

```rust
let translations_pl = Translations {
    tab_context_menu: TabContextMenuTranslations {
        close_button: "Zamknij zakładkę".to_string(),
        eject_button: "Przenieś zakładkę do nowego okna".to_string(),
    },
    leaf: LeafTranslations {
        close_button_disabled_tooltip: "Ten węzeł zawiera niezamykalne zakładki.".to_string(),
        close_all_button: "Zamknij okno".to_string(),
        close_all_button_menu_hint: "Kliknij prawym przyciskiem myszy, aby zamknąć to okno.".to_string(),
        close_all_button_modifier_hint: "Naciśnij klawisze modyfikujące (domyślnie Shift), aby zamknąć to okno.".to_string(),
        close_all_button_modifier_menu_hint: "Naciśnij klawisze modyfikujące (domyślnie Shift) lub kliknij prawym przyciskiem myszy, aby zamknąć to okno.".to_string(),
        close_all_button_disabled_tooltip: "To okno zawiera zakładki, których nie można zamknąć.".to_string(),
        minimize_button: "Zminimalizuj okno".to_string(),
        minimize_button_menu_hint: "Kliknij prawym przyciskiem myszy, aby zminimalizować to okno.".to_string(),
        minimize_button_modifier_hint: "Naciśnij klawisze modyfikujące (domyślnie Shift), aby zminimalizować to okno.".to_string(),
        minimize_button_modifier_menu_hint: "Naciśnij klawisze modyfikujące (domyślnie Shift) lub kliknij prawym przyciskiem myszy, aby zminimalizować to okno.".to_string(),
    }
};
let dock_state = DockState::<Tab>::new(vec![]).with_translations(translations_pl);
```

```rust
let mut dock_state = DockState::<Tab>::new(vec![]);
dock_state.translations.tab_context_menu.close_button = "タブを閉じる".to_string();
dock_state.translations.tab_context_menu.eject_button = "タブを新しいウィンドウへ移動".to_string();
dock_state.translations.leaf.close_button_disabled_tooltip = "このノードは閉じられないタブがある".to_string();
dock_state.translations.leaf.close_all_button = "ウィンドウを閉じる".to_string();
dock_state.translations.leaf.close_all_button_menu_hint = "右クリックでこのウィンドウを閉じる".to_string();
dock_state.translations.leaf.close_all_button_modifier_hint = "修飾キー（デフォルトではShift）を押して、このウィンドウを閉じます".to_string();
dock_state.translations.leaf.close_all_button_modifier_menu_hint = "修飾キー（デフォルトではShift）を押すか、右クリックしてこのウィンドウを閉じます".to_string();
dock_state.translations.leaf.close_all_button_disabled_tooltip = "このウィンドウは閉じられないタブがある".to_string();
dock_state.translations.leaf.minimize_button = "ウィンドウを最小化する".to_string();
dock_state.translations.leaf.minimize_button_menu_hint = "右クリックでウィンドウを最小化する".to_string();
dock_state.translations.leaf.minimize_button_modifier_hint = "修飾キー（デフォルトではShift）を押すと、このウィンドウが最小化されます".to_string();
dock_state.translations.leaf.minimize_button_modifier_menu_hint = "修飾キー（デフォルトではShift）を押すか、右クリックしてこのウィンドウを最小化する".to_string();
```

--------------------------------

### Type ID

Source: https://docs.rs/egui_dock/latest/egui_dock/widgets/dock_area/struct.DockArea.html

Gets the `TypeId` of the `DockArea`. This is useful for runtime type identification.

```APIDOC
## fn type_id(&self) -> TypeId

### Description
Gets the `TypeId` of `self`.

### Method
`type_id`

### Parameters
None

### Returns
- `TypeId`: The unique identifier for the type of `self`.
```

--------------------------------

### Inherit and Customize egui_dock Style

Source: https://docs.rs/egui_dock/latest/src/egui_dock/style.rs.html

Demonstrates how to inherit the default egui style and then customize specific properties like overlay type and tab add button alignment before applying it to a DockArea.

```rust
use egui_dock::{DockArea, DockState, OverlayType, Style, TabAddAlign, TabViewer};
use egui::{Ui, WidgetText};

struct MyTabViewer;

impl TabViewer for MyTabViewer {
    type Tab = ();
    fn title(&mut self, tab: &mut Self::Tab) -> WidgetText {
        WidgetText::default()
    }
    fn ui(&mut self, ui: &mut Ui, tab: &mut Self::Tab) {}
}

egui::__run_test_ctx(|ctx| {
    #[allow(deprecated)]
    egui::CentralPanel::default().show(ctx, |ui| {
        let mut dock_state = DockState::new(vec![]);
        // Inherit the look and feel from egui.
        let mut style = Style::from_egui(ui.style());

        // Modify a few fields.
        style.overlay.overlay_type = OverlayType::HighlightedAreas;
        style.buttons.add_tab_align = TabAddAlign::Left;

        // Use the style with the `DockArea`.
        DockArea::new(&mut dock_state)
            .style(style)
            .show_inside(ui, &mut MyTabViewer);
    });
});

```

--------------------------------

### DockArea Configuration Methods

Source: https://docs.rs/egui_dock/latest/src/egui_dock/widgets/dock_area/mod.rs.html

A collection of builder methods for configuring the appearance and behavior of the `DockArea` widget.

```APIDOC
## DockArea Configuration Methods

### Description
These methods allow for fine-grained control over the `DockArea`'s visual elements and interaction behaviors. They are typically chained after calling `DockArea::new()`.

### Methods

#### `id(id: Id) -> Self`

Sets the [`DockArea`] ID. Useful if you have more than one [`DockArea`] in your application to distinguish them.

#### `style(style: Style) -> Self`

Sets the look and feel of the [`DockArea`] using a provided `Style` object.

#### `show_add_popup(show_add_popup: bool) -> Self`

Shows or hides the add button popup. By default, it's `false`.

#### `show_add_buttons(show_add_buttons: bool) -> Self`

Shows or hides the tab add buttons. By default, it's `false`.

#### `show_close_buttons(show_close_buttons: bool) -> Self`

Shows or hides the tab close buttons. By default, it's `true`.

#### `tab_context_menus(tab_context_menus: bool) -> Self`

Determines whether tabs show a context menu when right-clicked. By default, it's `true`.

#### `draggable_tabs(draggable_tabs: bool) -> Self`

Enables or disables the dragging of tabs between nodes and reordering on the tab bar. By default, it's `true`.

#### `show_tab_name_on_hover(show_tab_name_on_hover: bool) -> Self`

Determines whether tabs display their names when hovered over. By default, it's `false`.

#### `allowed_splits(allowed_splits: AllowedSplits) -> Self`

Specifies the allowed directions for splitting nodes (left-right, top-bottom, all, or none). By default, all splits are allowed.
```

--------------------------------

### Get the number of surfaces

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/struct.DockState.html

Returns the current count of surfaces managed by the DockState.

```rust
pub fn surfaces_count(&self) -> usize
```

--------------------------------

### SurfaceIndex Conversions

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/surface_index/struct.SurfaceIndex.html

Demonstrates how to convert between `usize` and `SurfaceIndex`, and how `SurfaceIndex` can be converted into a `TabDestination`.

```APIDOC
## From<usize> for SurfaceIndex

```rust
fn from(index: usize) -> Self
```

Converts to this type from the input type.

## From<SurfaceIndex> for TabDestination

```rust
fn from(value: SurfaceIndex) -> TabDestination
```

Converts to this type from the input type.
```

--------------------------------

### Node::get_leaf_mut

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node/enum.Node.html

Get mutable access to the leaf data of this node, if it contains any.

```APIDOC
## pub fn get_leaf_mut(&mut self) -> Option<&mut LeafNode<Tab>>

Get mutable access to the leaf data of this node, if it contains any (i.e is a leaf).
```

--------------------------------

### Node::get_leaf

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node/enum.Node.html

Get immutable access to the leaf data of this node, if it contains any.

```APIDOC
## pub fn get_leaf(&self) -> Option<&LeafNode<Tab>>

Get immutable access to the leaf data of this node, if it contains any (i.e is a leaf).
```

--------------------------------

### Get SplitNode Rectangle

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node/struct.SplitNode.html

Retrieves the current rectangular area occupied by this SplitNode.

```rust
pub fn rect(&self) -> Rect
```

--------------------------------

### Get Surfaces Count

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/mod.rs.html

Returns the total number of surfaces currently managed by the DockState.

```rust
pub fn surfaces_count(&self) -> usize {
        self.surfaces.len()
    }
```

--------------------------------

### show

Source: https://docs.rs/egui_dock/latest/src/egui_dock/widgets/dock_area/show/mod.rs.html

Displays the `DockArea` at the top level. This method is deprecated and `show_inside` should be used instead, especially with eframe 0.34+ where `App::ui` provides direct access to `&mut Ui`.

```APIDOC
## show

### Description
Shows the `DockArea` at the top level. This method is deprecated and `show_inside` should be used instead.

### Method Signature
`pub fn show(self, ctx: &Context, tab_viewer: &mut impl TabViewer<Tab = Tab>)`

### Parameters
- `ctx`: The egui `Context` for the application.
- `tab_viewer`: A mutable reference to a type implementing the `TabViewer` trait.

### Deprecated
This method is deprecated. Use [`show_inside`](Self::show_inside) instead.
```

--------------------------------

### Get LeafNode Tab Count

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node/struct.LeafNode.html

Returns the number of tabs currently present in the LeafNode.

```rust
pub fn len(&self) -> usize>
```

--------------------------------

### Get Main Surface (Immutable)

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/struct.DockState.html

Provides an immutable borrow to the tree structure of the main surface.

```rust
pub fn main_surface(&self) -> &Tree<Tab>
```

--------------------------------

### DockArea Configuration Methods

Source: https://docs.rs/egui_dock/latest/src/egui_dock/widgets/dock_area/mod.rs.html

Methods for configuring the behavior of secondary buttons and window elements within the DockArea.

```APIDOC
## `show_secondary_button_hint`

### Description
Sets whether tooltip hints are shown for secondary buttons on tab bars.

### Parameters
- `show_secondary_button_hint` (bool) - Whether to show hints for secondary buttons.

### Returns
`Self` - The modified DockArea instance.
```

```APIDOC
## `secondary_button_modifiers`

### Description
Sets the key combination used to activate secondary buttons on tab bars.

### Parameters
- `secondary_button_modifiers` (Modifiers) - The modifier keys to activate secondary buttons.

### Returns
`Self` - The modified DockArea instance.
```

```APIDOC
## `secondary_button_on_modifier`

### Description
Determines whether secondary buttons on tab bars are activated by the modifier key.

### Parameters
- `secondary_button_on_modifier` (bool) - Whether to activate secondary buttons with a modifier key.

### Returns
`Self` - The modified DockArea instance.
```

```APIDOC
## `secondary_button_context_menu`

### Description
Enables or disables the activation of secondary buttons on tab bars via a context menu by right-clicking primary buttons.

### Parameters
- `secondary_button_context_menu` (bool) - Whether to use a context menu for secondary buttons.

### Returns
`Self` - The modified DockArea instance.
```

```APIDOC
## `window_bounds`

### Description
Sets the bounds for any windows inside the `DockArea`.

### Parameters
- `bounds` (Rect) - The rectangular bounds for windows.

### Returns
`Self` - The modified DockArea instance.
```

```APIDOC
## `show_window_close_buttons`

### Description
Enables or disables the close button on windows. This method is deprecated and `show_leaf_close_buttons` should be considered instead.

### Parameters
- `show_window_close_buttons` (bool) - Whether to show window close buttons.

### Returns
`Self` - The modified DockArea instance.
```

```APIDOC
## `show_window_collapse_buttons`

### Description
Enables or disables the collapsing header on windows. This method is deprecated and `show_leaf_collapse_buttons` should be considered instead.

### Parameters
- `show_window_collapse_buttons` (bool) - Whether to show window collapse buttons.

### Returns
`Self` - The modified DockArea instance.
```

```APIDOC
## `show_leaf_close_all_buttons`

### Description
Enables or disables the close all tabs button on tab bars.

### Parameters
- `show_leaf_close_all_buttons` (bool) - Whether to show the close all tabs button.

### Returns
`Self` - The modified DockArea instance.
```

```APIDOC
## `show_leaf_collapse_buttons`

### Description
Enables or disables the collapse tabs button on tab bars.

### Parameters
- `show_leaf_collapse_buttons` (bool) - Whether to show the collapse tabs button.

### Returns
`Self` - The modified DockArea instance.
```

--------------------------------

### Get Immutable Access to Tabs

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/node/struct.LeafNode.html

Provides read-only access to the list of tabs within the LeafNode.

```rust
pub fn tabs(&self) -> &[Tab]>
```

--------------------------------

### Get TypeId of Self

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/enum.TabDestination.html

Retrieves the unique TypeId for the current type. This is part of the Any trait implementation.

```rust
fn type_id(&self) -> TypeId
```

--------------------------------

### get_window_state

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/mod.rs.html

Gets an immutable reference to the WindowState associated with a given SurfaceIndex. Returns None if the surface is not a window.

```APIDOC
## get_window_state

### Description
Gets an immutable reference to the `WindowState` which corresponds to a `SurfaceIndex`. Returns `None` if the surface is an `Empty`, `Main`, or doesn't exist.

### Signature
```rust
pub fn get_window_state(&mut self, surface: SurfaceIndex) -> Option<&WindowState>
```

### Parameters
- **surface** (`SurfaceIndex`): The index of the surface to get the window state from.

### Returns
- `Option<&WindowState>`: An immutable reference to the `WindowState` if found, otherwise `None`.
```

--------------------------------

### Split Node Right in egui_dock

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/tree/struct.Tree.html

Creates two new nodes by splitting a parent node. The new node with provided tabs is placed to the right of the old node. Fraction determines the old node's area. Panics if fraction is out of range.

```rust
pub fn split_right( &mut self, parent: NodeIndex, fraction: f32, tabs: Vec<Tab>, ) -> [NodeIndex; 2]
```

--------------------------------

### get_window_state_mut

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/mod.rs.html

Gets a mutable reference to the WindowState associated with a given SurfaceIndex. Returns None if the surface is not a window.

```APIDOC
## get_window_state_mut

### Description
Gets a mutable reference to the `WindowState` which corresponds to a `SurfaceIndex`. Returns `None` if the surface is an `Empty`, `Main`, or doesn't exist.

### Signature
```rust
pub fn get_window_state_mut(&mut self, surface: SurfaceIndex) -> Option<&mut WindowState>
```

### Parameters
- **surface** (`SurfaceIndex`): The index of the surface to get the window state from.

### Returns
- `Option<&mut WindowState>`: A mutable reference to the `WindowState` if found, otherwise `None`.
```

--------------------------------

### Get and clear expanded height

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/window_state.rs.html

Retrieves and clears the pending expanded height for the window. This is an internal method.

```rust
#[inline(always)]
pub(crate) fn expanded_height(&mut self) -> Option<f32> {
    self.expanded_height.take()
}
```

--------------------------------

### Initialize DockState with Tabs

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/struct.DockState.html

Creates a new DockState with the provided tabs initialized at the main surface's root node.

```rust
pub fn new(tabs: Vec<Tab>) -> Self
```

--------------------------------

### Get and clear next size

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/window_state.rs.html

Retrieves and clears the pending next size for the window. This is an internal method.

```rust
#[inline(always)]
pub(crate) fn next_size(&mut self) -> Option<Vec2> {
    self.next_size.take()
}
```

--------------------------------

### fn from_output(output: <Result<T, E> as Try>::Output) -> Result<T, E>

Source: https://docs.rs/egui_dock/latest/egui_dock/dock_state/type.Result.html

Constructs a `Result<T, E>` from its `Output` type.

```APIDOC
## fn from_output(output: <Result<T, E> as Try>::Output) -> Result<T, E>

### Description
Constructs the type from its `Output` type. Read more

### Parameters
* `output`: The output value to construct the Result from.

### Returns
A `Result<T, E>` constructed from the provided output.
```

--------------------------------

### Get and clear next position

Source: https://docs.rs/egui_dock/latest/src/egui_dock/dock_state/window_state.rs.html

Retrieves and clears the pending next position for the window. This is an internal method.

```rust
#[inline(always)]
pub(crate) fn next_position(&mut self) -> Option<Pos2> {
    self.next_position.take()
}
```