Trait piston_window::prelude::input::PressEvent

source · 
pub trait PressEvent: Sized {
    // Required methods
    fn from_button(button: Button, old_event: &Self) -> Option<Self>;
    fn press<U, F>(&self, f: F) -> Option<U>
       where F: FnMut(Button) -> U;

    // Provided method
    fn press_args(&self) -> Option<Button> { ... }
}
Expand description

The press of a button.

Required Methods§

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fn from_button(button: Button, old_event: &Self) -> Option<Self>

Creates a press event.

Preserves scancode from original button event, if any. Preserves time stamp from original input event, if any.

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fn press<U, F>(&self, f: F) -> Option<U>
where F: FnMut(Button) -> U,

Calls closure if this is a press event.

Provided Methods§

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fn press_args(&self) -> Option<Button>

Returns press arguments.

Examples found in repository?
examples/hello_piston.rs (line 24)
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fn main() {
    let title = "Hello Piston! (press any key to enter inner loop)";
    let mut window: PistonWindow = WindowSettings::new(title, [640, 480])
        .exit_on_esc(true)
        .build()
        .unwrap_or_else(|e| panic!("Failed to build PistonWindow: {}", e));

    window.set_lazy(true);
    while let Some(e) = window.next() {
        window.draw_2d(&e, |c, g, _| {
            clear([0.5, 1.0, 0.5, 1.0], g);
            rectangle(
                [1.0, 0.0, 0.0, 1.0],
                [50.0, 50.0, 100.0, 100.0],
                c.transform,
                g,
            );
        });

        if e.press_args().is_some() {
            InnerApp {
                title: "Inner loop (press X to exit inner loop)",
                exit_button: Button::Keyboard(Key::X),
            }
            .run(&mut window);
            window.set_title(title.into());
        }
    }
}

/// Stores application state of inner event loop.
pub struct InnerApp {
    pub title: &'static str,
    pub exit_button: Button,
}

impl InnerApp {
    pub fn run(&mut self, window: &mut PistonWindow) {
        window.set_title(self.title.into());
        while let Some(e) = window.next() {
            window.draw_2d(&e, |c, g, _| {
                clear([0.5, 0.5, 1.0, 1.0], g);
                ellipse(
                    [1.0, 0.0, 0.0, 1.0],
                    [50.0, 50.0, 100.0, 100.0],
                    c.transform,
                    g,
                );
            });
            if let Some(button) = e.press_args() {
                if button == self.exit_button {
                    break;
                }
            }
        }
    }

Object Safety§

This trait is not object safe.

Implementors§

source§

impl<T> PressEvent for T
where T: ButtonEvent,