padstate 0.2.5

Tiny structs that hold a game controller's state
Documentation 
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use crate::{AnyButton, Button};

/// A simple virtual Game controller with only digital buttons.
#[derive(Default, Debug, PartialEq, Clone, Copy)]
pub struct DPad {
    pub state: u16,
    pub previous: u16,
}

impl DPad {
    pub fn new() -> Self {
        Self::default()
    }

    /// Must be called once per frame, prior to setting any value for the current state.
    #[inline(always)]
    pub fn copy_current_to_previous_state(&mut self) {
        self.previous = self.state;
    }

    /// Whether the given button is currentl down.
    #[inline(always)]
    pub fn is_down(&self, button: Button) -> bool {
        (self.state & button as u16) != 0
    }

    /// Whether the given button is currentl up.
    #[inline(always)]
    pub fn is_up(&self, button: Button) -> bool {
        (self.state & button as u16) == 0
    }

    /// Whether the given button has just been pressed this frame. Requires
    /// [copy_current_to_previous_state] to have been called at the beginning of the frame
    #[inline(always)]
    pub fn is_just_pressed(&self, button: Button) -> bool {
        self.is_down(button) && (self.previous & button as u16 == 0)
    }

    /// Whether the given button has just been released this frame. Requires
    /// [copy_current_to_previous_state] to have been called at the beginning of the frame
    #[inline(always)]
    pub fn is_just_released(&self, button: Button) -> bool {
        !self.is_down(button) && (self.previous & button as u16 != 0)
    }

    /// Whether any button in the group is currently down.
    #[inline(always)]
    pub fn is_any_down(&self, button_group: AnyButton) -> bool {
        (self.state & button_group as u16) != 0
    }

    /// Whether any button in the group was just pressed this frame.
    #[inline(always)]
    pub fn is_any_just_pressed(&self, button_group: AnyButton) -> bool {
        let current_state = self.state & button_group as u16;
        let previous_state = self.previous & button_group as u16;

        current_state != 0 && previous_state == 0
    }

    /// Whether any button in the group was just released this frame.
    #[inline(always)]
    pub fn is_any_just_released(&self, button_group: AnyButton) -> bool {
        let current_state = self.state & button_group as u16;
        let previous_state = self.previous & button_group as u16;

        current_state == 0 && previous_state != 0
    }

    /// Sets the bit for a particular button.
    #[inline(always)]
    pub fn set_state(&mut self, button: Button, value: bool) {
        if value {
            self.state |= button as u16;
        } else {
            self.state &= !(button as u16);
        }
    }
}