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//! # Cursive //! //! [Cursive](https://github.com/gyscos/Cursive) is a TUI library built on top //! of ncurses-rs. //! It allows to easily build layouts for text-based applications. //! //! ## Getting started //! //! * Every application should start with a [`Cursive`](struct.Cursive.html) //! object. It is the main entry-point to the library. //! * A declarative phase then describes the structure of the UI by adding //! views and configuring their behaviours. //! * Finally, the event loop is started by calling //! [`Cursive::run(&mut self)`](struct.Cursive.html#method.run). //! //! ## Views //! //! Views are the main components of a cursive interface. //! The [`view`](./view/index.html) module contains many views to use in your //! application; if you don't find what you need, you may also implement the //! [`View`](view/trait.View.html) trait and build your own. //! //! ## Callbacks //! //! Cursive is a *reactive* UI: it *reacts* to events generated by user input. //! //! During the declarative phase, callbacks are set to trigger on specific //! events. These functions usually take a `&mut Cursive` argument, allowing //! them to modify the view tree at will. //! //! ## Examples //! //! ```no_run //! extern crate cursive; //! //! use cursive::prelude::*; //! //! fn main() { //! let mut siv = Cursive::new(); //! //! siv.add_layer(TextView::new("Hello World!\nPress q to quit.")); //! //! siv.add_global_callback('q', |s| s.quit()); //! //! siv.run(); //! } //! ``` #![deny(missing_docs)] extern crate ncurses; extern crate toml; extern crate unicode_segmentation; extern crate unicode_width; macro_rules! println_stderr( ($($arg:tt)*) => { { use ::std::io::Write; let r = writeln!(&mut ::std::io::stderr(), $($arg)*); r.expect("failed printing to stderr"); } } ); macro_rules! new_default( ($c:ident) => { impl Default for $c { fn default() -> Self { Self::new() } } } ); pub mod prelude; pub mod event; pub mod view; pub mod vec; pub mod theme; pub mod align; pub mod menu; pub mod direction; // This probably doesn't need to be public? mod printer; mod xy; mod with; mod div; mod utf8; mod backend; pub use xy::XY; pub use with::With; pub use printer::Printer; use backend::{Backend, NcursesBackend}; use std::any::Any; use std::rc::Rc; use std::collections::HashMap; use std::path::Path; use vec::Vec2; use view::View; use view::{Selector, StackView}; use event::{Callback, Event, EventResult}; /// Identifies a screen in the cursive ROOT. pub type ScreenId = usize; /// Central part of the cursive library. /// /// It initializes ncurses on creation and cleans up on drop. /// To use it, you should populate it with views, layouts and callbacks, /// then start the event loop with run(). /// /// It uses a list of screen, with one screen active at a time. pub struct Cursive { theme: theme::Theme, screens: Vec<StackView>, global_callbacks: HashMap<Event, Callback>, menubar: view::Menubar, active_screen: ScreenId, running: bool, } new_default!(Cursive); // Use the Ncurses backend. // TODO: make this feature-driven type B = NcursesBackend; impl Cursive { /// Creates a new Cursive root, and initialize ncurses. pub fn new() -> Self { // Default delay is way too long. 25 is imperceptible yet works fine. B::init(); let theme = theme::load_default(); // let theme = theme::load_theme("assets/style.toml").unwrap(); let mut res = Cursive { theme: theme, screens: Vec::new(), global_callbacks: HashMap::new(), menubar: view::Menubar::new(), active_screen: 0, running: true, }; res.screens.push(StackView::new()); res } /// Selects the menubar pub fn select_menubar(&mut self) { self.menubar.take_focus(direction::Direction::none()); } /// Sets the menubar autohide_menubar feature. /// /// * When enabled, the menu is only visible when selected. /// * When disabled, the menu is always visible and reserves the top row. pub fn set_autohide_menu(&mut self, autohide: bool) { self.menubar.autohide = autohide; } /// Retrieve the menu tree used by the menubar. /// /// This allows to add menu items to the menubar. /// /// # Examples /// /// ``` /// # extern crate cursive; /// # /// # use cursive::prelude::*; /// # /// # fn main() { /// let mut siv = Cursive::new(); /// /// siv.menubar() /// .add("File", /// MenuTree::new() /// .leaf("New", |s| s.add_layer(Dialog::info("New file!"))) /// .subtree("Recent", MenuTree::new().with(|tree| { /// for i in 1..100 { /// tree.add_leaf(&format!("Item {}", i), |_| ()) /// } /// })) /// .delimiter() /// .with(|tree| { /// for i in 1..10 { /// tree.add_leaf(&format!("Option {}", i), |_| ()); /// } /// }) /// .delimiter() /// .leaf("Quit", |s| s.quit())) /// .add("Help", /// MenuTree::new() /// .subtree("Help", /// MenuTree::new() /// .leaf("General", |s| { /// s.add_layer(Dialog::info("Help message!")) /// }) /// .leaf("Online", |s| { /// s.add_layer(Dialog::info("Online help?")) /// })) /// .leaf("About", /// |s| s.add_layer(Dialog::info("Cursive v0.0.0")))); /// /// siv.add_global_callback(Key::Esc, |s| s.select_menubar()); /// # } /// ``` pub fn menubar(&mut self) -> &mut view::Menubar { &mut self.menubar } /// Returns the currently used theme pub fn current_theme(&self) -> &theme::Theme { &self.theme } /// Loads a theme from the given file. /// /// Returns TRUE if the theme was successfully loaded. pub fn load_theme<P: AsRef<Path>>(&mut self, filename: P) -> bool { match theme::load_theme(filename) { Err(_) => return false, Ok(theme) => self.theme = theme, } true } /// Sets the refresh rate, in frames per second. /// /// Regularly redraws everything, even when no input is given. /// Between 0 and 1000. /// Call with fps=0 to disable (default value). pub fn set_fps(&self, fps: u32) { B::set_refresh_rate(fps) } /// Returns a reference to the currently active screen. pub fn screen(&self) -> &StackView { let id = self.active_screen; &self.screens[id] } /// Returns a mutable reference to the currently active screen. pub fn screen_mut(&mut self) -> &mut StackView { let id = self.active_screen; self.screens.get_mut(id).unwrap() } /// Adds a new screen, and returns its ID. pub fn add_screen(&mut self) -> ScreenId { let res = self.screens.len(); self.screens.push(StackView::new()); res } /// Convenient method to create a new screen, and set it as active. pub fn add_active_screen(&mut self) -> ScreenId { let res = self.add_screen(); self.set_screen(res); res } /// Sets the active screen. Panics if no such screen exist. pub fn set_screen(&mut self, screen_id: ScreenId) { if screen_id >= self.screens.len() { panic!("Tried to set an invalid screen ID: {}, but only {} \ screens present.", screen_id, self.screens.len()); } self.active_screen = screen_id; } fn find_any(&mut self, selector: &Selector) -> Option<&mut Any> { // Internal find method that returns a Any object. self.screen_mut().find(selector) } /// Tries to find the view pointed to by the given path. /// /// If the view is not found, or if it is not of the asked type, /// it returns None. /// /// # Examples /// /// ``` /// # extern crate cursive; /// # use cursive::prelude::*; /// # fn main() { /// let mut siv = Cursive::new(); /// /// siv.add_layer(IdView::new("text", TextView::new("Text #1"))); /// /// siv.add_global_callback('p', |s| { /// s.find::<TextView>(&Selector::Id("text")) /// .unwrap() /// .set_content("Text #2"); /// }); /// # } /// ``` pub fn find<V: View + Any>(&mut self, sel: &Selector) -> Option<&mut V> { match self.find_any(sel) { None => None, Some(b) => b.downcast_mut::<V>(), } } /// Convenient method to use `find` with a `Selector::Id`. /// /// # Examples /// /// ``` /// # extern crate cursive; /// # use cursive::prelude::*; /// # fn main() { /// let mut siv = Cursive::new(); /// /// siv.add_layer(IdView::new("text", TextView::new("Text #1"))); /// /// siv.add_global_callback('p', |s| { /// s.find_id::<TextView>("text") /// .unwrap() /// .set_content("Text #2"); /// }); /// # } /// ``` pub fn find_id<V: View + Any>(&mut self, id: &str) -> Option<&mut V> { self.find(&Selector::Id(id)) } /// Adds a global callback. /// /// Will be triggered on the given key press when no view catches it. /// /// # Examples /// /// ``` /// # extern crate cursive; /// # use cursive::prelude::*; /// # fn main() { /// let mut siv = Cursive::new(); /// /// siv.add_global_callback('q', |s| s.quit()); /// # } /// ``` pub fn add_global_callback<F, E: Into<Event>>(&mut self, event: E, cb: F) where F: Fn(&mut Cursive) + 'static { self.global_callbacks.insert(event.into(), Rc::new(cb)); } /// Convenient method to add a layer to the current screen. /// /// # Examples /// /// ``` /// # extern crate cursive; /// # use cursive::prelude::*; /// # fn main() { /// let mut siv = Cursive::new(); /// /// siv.add_layer(TextView::new("Hello world!")); /// # } /// ``` pub fn add_layer<T: 'static + View>(&mut self, view: T) { self.screen_mut().add_layer(view); } /// Convenient method to remove a layer from the current screen. pub fn pop_layer(&mut self) { self.screen_mut().pop_layer(); } // Handles a key event when it was ignored by the current view fn on_event(&mut self, event: Event) { let cb = match self.global_callbacks.get(&event) { None => return, Some(cb) => cb.clone(), }; // Not from a view, so no viewpath here cb(self); } /// Returns the size of the screen, in characters. pub fn screen_size(&self) -> Vec2 { let (x, y) = B::screen_size(); Vec2 { x: x as usize, y: y as usize, } } fn layout(&mut self) { let size = self.screen_size(); self.screen_mut().layout(size); } fn draw(&mut self) { // TODO: don't clone the theme // Reference it or something let printer = Printer::new(self.screen_size(), self.theme.clone()); // Draw the currently active screen // If the menubar is active, nothing else can be. let offset = if self.menubar.autohide { 0 } else { 1 }; // Draw the menubar? if self.menubar.visible() { let printer = printer.sub_printer(Vec2::zero(), printer.size, self.menubar.receive_events()); self.menubar.draw(&printer); } let selected = self.menubar.receive_events(); let printer = printer.sub_printer(Vec2::new(0, offset), printer.size, !selected); self.screen_mut().draw(&printer); B::refresh(); } /// Runs the event loop. /// /// It will wait for user input (key presses) /// and trigger callbacks accordingly. /// /// Blocks until quit() is called. pub fn run(&mut self) { // And the big event loop begins! while self.running { // Do we need to redraw everytime? // Probably, actually. // TODO: Do we need to re-layout everytime? self.layout(); // TODO: Do we need to redraw every view every time? // (Is this getting repetitive? :p) self.draw(); // Wait for next event. // (If set_fps was called, this returns -1 now and then) let event = B::poll_event(); if event == Event::WindowResize { B::clear(); } // Event dispatch order: // * Focused element: // * Menubar (if active) // * Current screen (top layer) // * Global callbacks if self.menubar.receive_events() { if let EventResult::Consumed(Some(cb)) = self.menubar .on_event(event) { cb(self); } } else { match self.screen_mut().on_event(event) { // If the event was ignored, // it is our turn to play with it. EventResult::Ignored => self.on_event(event), EventResult::Consumed(None) => (), EventResult::Consumed(Some(cb)) => cb(self), } } } } /// Stops the event loop. pub fn quit(&mut self) { self.running = false; } } impl Drop for Cursive { fn drop(&mut self) { B::finish(); } }