Struct vizia_core::input::Keymap

pub struct Keymap<T>
where
    T: 'static + Clone + PartialEq + Send + Sync,
{ /* private fields */ }

A keymap that associates key chords with actions.

This is useful if you have an application that lets the user configure their key chords. It allows you to check if a particular action is pressed rather than the actual keys. The relationship between a key chord and an action is a many-to-many relationship.

Examples

First we need to create something that represents an action in our application. This is usually an enum.

#[derive(PartialEq, Copy, Clone)]
enum Action {
    One,
    Two,
    Three,
}

Now we can create a new keymap inside of our application and configure our key chords. We will bind Action::One to the key chord A, Action::Two to the key chord CTRL+B and Action::Three to the key chord CTRL+SHIFT+C. Every action has an associated callback function that gets triggered when the key chord is pressed.

let keymap = Keymap::from(vec![
    (KeyChord::new(Modifiers::empty(), Code::KeyA), KeymapEntry::new(Action::One, |_| debug!("Action One"))),
    (KeyChord::new(Modifiers::CTRL, Code::KeyB), KeymapEntry::new(Action::Two, |_| debug!("Action Two"))),
    (KeyChord::new(Modifiers::CTRL | Modifiers::SHIFT, Code::KeyC), KeymapEntry::new(Action::Three, |_| debug!("Action Three"))),
]);

Implementations

impl<T> Keymap<T>

where T: 'static + Clone + PartialEq + Send + Sync,

pub fn new() -> Self

Creates a new keymap.

Examples

let keymap = Keymap::<Action>::new();

pub fn pressed_actions( &self, cx: &Context, code: Code, ) -> impl Iterator<Item = &KeymapEntry<T>>

Returns an iterator over every pressed keymap entry.

Examples

for entry in keymap.pressed_actions(cx, Code::KeyA) {
    debug!("The action {:?} is being pressed!", entry.action());
};

pub fn export(&self) -> Vec<(&KeyChord, &KeymapEntry<T>)>

Exports all keymap entries and their associated key chords.

This is useful if you want to have a settings window and need to access every key chord and keymap entry of a keymap.

Examples

let actions_chords = keymap.export();

for (chord, entry) in actions_chords {
    debug!("The key chord {:?} triggers the action {:?}!", chord, entry.action());
}

Trait Implementations

impl<T> Default for Keymap<T>

where T: 'static + Clone + PartialEq + Send + Sync + Default,

fn default() -> Keymap<T>

Returns the “default value” for a type.

impl<T> From<Vec<(KeyChord, KeymapEntry<T>)>> for Keymap<T>

where T: 'static + Clone + PartialEq + Send + Sync,

fn from(vec: Vec<(KeyChord, KeymapEntry<T>)>) -> Self

Converts to this type from the input type.

impl<T> Model for Keymap<T>

where T: 'static + Clone + PartialEq + Send + Sync,

fn event(&mut self, cx: &mut EventContext<'_>, event: &mut Event)

Respond to events in order to mutate the model data.

fn build(self, cx: &mut Context)

Build the model data into the application tree.

fn name(&self) -> Option<&'static str>