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//! A Rust binding for the Tk graphics toolkit.
//!
//! rstk opens and communicates with Tk's wish program as a separate process.
//! The library provides:
//!
//! * low-level functions to directly communicate with wish, suitable for
//! writing additional extensions
//! * high-level API to write GUI applications with minimal knowledge of Tk.
//!
//! The top-level functions to start/stop the GUI are contained
//! in the [wish] module.
//!
//! The remaining modules describe a widget or supporting component
//! (such as a font or image). Each widget has a constructor function,
//! usually named "make_WIDGET", and this returns a struct of name "TkWIDGET".
//!
//! Click on the struct name to get a list of methods supported by the
//! widget; functionality is divided between various traits, such as
//! [TkWidget](widget::TkWidget).
//!
//! For examples and additional documentation, see the project
//! [webpage](https://peterlane.netlify.app/rstk/).
//!
//! # Example
//!
//! A simple hello-world example:
//!
//! ```
//! use rstk::*;
//!
//! fn main() {
//! let root = rstk::start_wish().unwrap();
//!
//! let hello = rstk::make_label(&root);
//! hello.text("Hello from Rust/Tk");
//!
//! hello.grid().layout();
//!
//! rstk::mainloop();
//! }
//! ```
//!
//! ## Widget lifetimes
//!
//! The Tk process operates independently of your rust program. All references
//! to widgets in rust are merely string names used to 'lookup' the widget
//! when calling out to Tk. As such, widgets will remain live and visible even
//! if a variable referring to them goes out of scope in your rust code.
//! If you wish to destroy a widget, use the [destroy](widget::TkWidget::destroy)
//! method available on all widgets.
//!
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