mirror of
https://github.com/FliegendeWurst/cursive.git
synced 2024-11-23 09:25:01 +00:00
Add ViewPath and Cursive::find
Callbacks now include a path to the triggering view. The Cursive root can find the View corresponding to a ViewPath. In the future, ViewPaths may be returned when creating the layout.
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@ -2,9 +2,12 @@
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use std::rc::Rc;
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use ::Cursive;
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use view::ViewPath;
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/// Callback is a function that can be triggered by an event.
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/// It has a mutable access to the cursive root.
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pub type Callback = Box<Fn(&mut super::Cursive)>;
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pub type Callback = Box<Fn(&mut Cursive, &ViewPath)>;
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/// Answer to an event notification.
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/// The event can be consumed or ignored.
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@ -12,5 +15,5 @@ pub enum EventResult {
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/// The event was ignored. The parent can keep handling it.
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Ignored,
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/// The event was consumed. An optionnal callback to run is attached.
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Consumed(Option<Rc<Callback>>),
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Consumed(Option<Rc<Callback>>, ViewPath),
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}
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33
src/lib.rs
33
src/lib.rs
@ -20,26 +20,23 @@
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//! siv.run();
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//! }
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//! ```
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extern crate ncurses;
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pub mod event;
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pub mod view;
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pub mod printer;
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pub mod vec2;
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mod box_view;
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mod stack_view;
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mod text_view;
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mod div;
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use std::any::Any;
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use std::rc::Rc;
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use std::collections::HashMap;
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use vec2::Vec2;
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use view::View;
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use printer::Printer;
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use stack_view::StackView;
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use view::{StackView,ViewPath};
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use event::{EventResult,Callback};
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@ -47,6 +44,7 @@ use event::{EventResult,Callback};
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pub type ScreenId = usize;
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/// Central part of the cursive library.
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///
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/// It initializes ncurses on creation and cleans up on drop.
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/// To use it, you should populate it with views, layouts and callbacks,
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/// then start the event loop with run().
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@ -110,9 +108,23 @@ impl Cursive {
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self.active_screen = screen_id;
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}
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fn find_any(&mut self, path: &ViewPath) -> Option<&mut Any> {
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self.screen_mut().find(path)
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}
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/// Tries to find the view pointed to by the given path.
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/// If the view is not found, or if it is not of the asked type,
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/// it returns None.
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pub fn find<V: View + Any>(&mut self, path: &ViewPath) -> Option<&mut V> {
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match self.find_any(path) {
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None => None,
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Some(b) => b.downcast_mut::<V>(),
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}
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}
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/// Adds a global callback, triggered on the given key press when no view catches it.
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pub fn add_global_callback<F>(&mut self, key: i32, cb: F)
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where F: Fn(&mut Cursive) + 'static
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where F: Fn(&mut Cursive, &ViewPath) + 'static
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{
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self.global_callbacks.insert(key, Rc::new(Box::new(cb)));
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}
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@ -128,9 +140,11 @@ impl Cursive {
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None => return,
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Some(cb) => cb.clone(),
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};
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cb(self);
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// Not from a view, so no viewpath here
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cb(self, &ViewPath::new());
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}
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/// Returns the size of the screen, in characters.
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pub fn screen_size(&self) -> Vec2 {
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let mut x: i32 = 0;
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let mut y: i32 = 0;
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@ -180,12 +194,13 @@ impl Cursive {
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// If the event was ignored, it is our turn to play with it.
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match self.screen_mut().on_key_event(ch) {
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EventResult::Ignored => self.on_key_event(ch),
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EventResult::Consumed(None) => (),
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EventResult::Consumed(Some(cb)) => cb(self),
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EventResult::Consumed(None, _) => (),
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EventResult::Consumed(Some(cb), path) => cb(self, &path),
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}
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}
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}
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/// Stops the event loop.
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pub fn quit(&mut self) {
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self.running = false;
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}
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@ -7,9 +7,13 @@ fn main() {
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let mut siv = Cursive::new();
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// We can quit by pressing q
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siv.add_global_callback('q' as i32, |s| s.quit());
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siv.add_global_callback('q' as i32, |s,_| s.quit());
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siv.add_layer(TextView::new("Hello World!\nPress q to quit the application."));
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siv.add_global_callback('a' as i32, |s, _| {
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//
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});
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siv.run();
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}
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@ -1,12 +0,0 @@
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use super::View;
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pub trait ToView {
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fn to_view(self) -> Box<View>;
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}
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impl<'a> ToView for &'a str {
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fn to_view(self) -> Box<View> {
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Box::new(TextView::new(self))
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}
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}
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@ -1,6 +1,6 @@
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use event::EventResult;
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use vec2::{Vec2,ToVec2};
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use view::{View,SizeRequest};
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use super::{View,SizeRequest};
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use printer::Printer;
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/// BoxView is a wrapper around an other view, with a given minimum size.
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59
src/view/key_event_view.rs
Normal file
59
src/view/key_event_view.rs
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@ -0,0 +1,59 @@
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use std::collections::HashMap;
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use std::rc::Rc;
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use ::Cursive;
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use event::{EventResult,Callback};
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use vec2::{Vec2};
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use super::{View,SizeRequest,ViewPath};
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use printer::Printer;
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/// A simple wrapper view that catches some ignored event from its child.
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///
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/// Events ignored by its child without a callback will stay ignored.
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pub struct KeyEventView {
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content: Box<View>,
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callbacks: HashMap<i32, Rc<Callback>>,
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}
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impl KeyEventView {
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/// Wraps the given view in a new KeyEventView.
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pub fn new<V: View + 'static>(view: V) -> Self {
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KeyEventView {
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content: Box::new(view),
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callbacks: HashMap::new(),
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}
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}
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/// Registers a callback when the given key is ignored by the child.
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pub fn register<F>(mut self, key: i32, cb: F) -> Self
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where F: Fn(&mut Cursive, &ViewPath) + 'static
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{
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self.callbacks.insert(key, Rc::new(Box::new(cb)));
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self
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}
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}
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impl View for KeyEventView {
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fn on_key_event(&mut self, ch: i32) -> EventResult {
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match self.content.on_key_event(ch) {
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EventResult::Ignored => match self.callbacks.get(&ch) {
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None => EventResult::Ignored,
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Some(cb) => EventResult::Consumed(Some(cb.clone()), ViewPath::new()),
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},
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EventResult::Consumed(cb, path) => EventResult::Consumed(cb, path),
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}
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}
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fn draw(&self, printer: &Printer) {
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self.content.draw(printer)
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}
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fn get_min_size(&self, req: SizeRequest) -> Vec2 {
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self.content.get_min_size(req)
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}
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fn layout(&mut self, size: Vec2) {
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self.content.layout(size);
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}
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}
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@ -1,11 +1,20 @@
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//! Defines various views to use when creating the layout.
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mod box_view;
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mod stack_view;
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mod text_view;
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mod key_event_view;
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mod view_path;
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use std::any::Any;
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pub use self::view_path::ViewPath;
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pub use self::key_event_view::KeyEventView;
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pub use self::box_view::BoxView;
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pub use self::stack_view::StackView;
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pub use self::text_view::TextView;
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use event::EventResult;
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pub use box_view::BoxView;
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pub use stack_view::StackView;
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pub use text_view::TextView;
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use vec2::Vec2;
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use printer::Printer;
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@ -43,4 +52,9 @@ pub trait View {
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/// Draws the view within the given bounds.
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fn draw(&self, &Printer);
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/// Finds the view pointed to by the given path.
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/// Returns None if the path doesn't lead to a view.
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fn find(&mut self, &ViewPath) -> Option<&mut Any> { None }
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}
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15
src/view/view_path.rs
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15
src/view/view_path.rs
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@ -0,0 +1,15 @@
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/// Represents a path to a single view in the layout.
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pub struct ViewPath {
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/// List of turns to make on decision nodes when descending the view tree.
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/// Simple nodes (with one fixed child) are skipped.
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pub path: Vec<usize>,
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}
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impl ViewPath {
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/// Creates a new empty path.
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pub fn new() -> Self {
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ViewPath {
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path: Vec::new(),
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}
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}
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}
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