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//! Undo service, commands and other types.
//!
//! The [`UNDO`] service can be used to operate the contextual undo stack, you can also use the service
//! to implement undo/redo for any variable using [`UNDO.watch_var`]. The [`UNDO_CMD`] and [`REDO_CMD`]
//! commands can be used with [`undo_scoped`] to control the focused undo scope. The [`history::UndoHistory!`]
//! widget visualizes the undo or redo stack of the focused undo scope. The example below demonstrates all
//! of this together to define two widgets that undo and redo and shows the history in a drop-down.
//!
//! [`UNDO.watch_var`]: UNDO::watch_var
//! [`undo_scoped`]: CommandUndoExt::undo_scoped
//! [`history::UndoHistory!`]: struct@history::UndoHistory
//!
//! ```
//! use zng::prelude::*;
//!
//! fn undo_combo(op: zng::undo::UndoOp) -> impl UiNode {
//!     let cmd = op.cmd().undo_scoped();
//!
//!     Toggle! {
//!         style_fn = toggle::ComboStyle!();
//!
//!         widget::enabled = cmd.flat_map(|c| c.is_enabled());
//!
//!         child = Button! {
//!             child = widget::node::presenter((), cmd.flat_map(|c| c.icon()));
//!             child_right = Text!(cmd.flat_map(|c| c.name())), 4;
//!             tooltip = Tip!(Text!(cmd.flat_map(|c|c.name_with_shortcut())));
//!             on_click = hn!(|a: &gesture::ClickArgs| {
//!                 a.propagation().stop();
//!                 cmd.get().notify();
//!             });
//!         };
//!
//!         checked_popup = wgt_fn!(|_| popup::Popup! {
//!             child = zng::undo::history::UndoHistory!(op);
//!         });
//!     }
//! }
//!
//! # let _scope = APP.defaults();
//! # let _ =
//! Wrap! {
//!     spacing = 5;
//!     zng::focus::alt_focus_scope = true;
//!     children = ui_vec![
//!         undo_combo(zng::undo::UndoOp::Undo),
//!         undo_combo(zng::undo::UndoOp::Redo),
//!     ];
//! }
//! # ;
//! ```
//!
//! # Full API
//!
//! See [`zng_ext_undo`] for the full undo API.

pub use zng_ext_undo::{
    CommandUndoExt, RedoAction, UndoAction, UndoActionMergeArgs, UndoFullOp, UndoInfo, UndoOp, UndoSelect, UndoSelectInterval,
    UndoSelectLtEq, UndoSelector, UndoStackInfo, UndoTransaction, UndoVarModifyTag, WidgetInfoUndoExt, WidgetUndoScope, CLEAR_HISTORY_CMD,
    REDO_CMD, UNDO, UNDO_CMD,
};

pub use zng_wgt_undo::{undo_enabled, undo_interval, undo_limit, undo_scope, UndoMix};

/// Undo history widget.
///
/// # Full API
///
/// See [`zng_wgt_undo_history`] for the full undo API.
pub mod history {
    pub use zng_wgt_undo_history::{
        group_by_undo_interval, is_cap_hovered_timestamp, undo_button_style_fn, UndoEntryArgs, UndoHistory, UndoPanelArgs,
        UndoRedoButtonStyle, UndoStackArgs,
    };
}