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//! Small tracked parts of the application state. Includes [**window**](mod.window.html),
//! [**keys**](mod.keys.html), [**mouse**](mod.mouse.html), [**time**](mod.mouse.html) - each of
//! which are stored in the **App**.
pub use self::keys::Keys;
pub use self::mouse::Mouse;
pub use self::time::Time;
pub use self::window::Window;
/// Tracked state related to the focused window.
pub mod window {
use crate::geom;
use crate::window;
/// The default scalar value used for window positioning and sizing.
pub type DefaultScalar = geom::scalar::Default;
/// State of the window in focus.
#[derive(Copy, Clone, Debug, PartialEq)]
pub struct Window {
/// ID of the window currently in focus.
pub id: Option<window::Id>,
}
impl Window {
/// Initialise the window state.
pub fn new() -> Self {
Window { id: None }
}
/// Expects that there will be a `window::Id` (the common case) and **panic!**s otherwise.
pub fn id(&self) -> window::Id {
self.id.unwrap()
}
}
}
/// Tracked state related to the keyboard.
pub mod keys {
use crate::event::{Key, ModifiersState};
use std::collections::HashSet;
use std::ops::Deref;
/// The state of the keyboard.
#[derive(Clone, Debug, Default)]
pub struct Keys {
/// The state of the modifier keys as last indicated by winit.
pub mods: ModifiersState,
/// The state of all keys as tracked via the nannou App event handling.
pub down: Down,
}
/// The set of keys that are currently pressed.
#[derive(Clone, Debug, Default)]
pub struct Down {
pub(crate) keys: HashSet<Key>,
}
impl Deref for Down {
type Target = HashSet<Key>;
fn deref(&self) -> &Self::Target {
&self.keys
}
}
}
/// Tracked state related to the mouse.
pub mod mouse {
use crate::geom::{self, Point2};
use crate::math::BaseFloat;
use crate::window;
use std;
/// The default scalar value used for positions.
pub type DefaultScalar = geom::scalar::Default;
#[doc(inline)]
pub use crate::event::MouseButton as Button;
/// The max total number of buttons on a mouse.
pub const NUM_BUTTONS: usize = 9;
/// The state of the `Mouse` at a single moment in time.
#[derive(Copy, Clone, Debug, PartialEq)]
pub struct Mouse<S = DefaultScalar> {
/// The ID of the last window currently in focus.
pub window: Option<window::Id>,
/// *x* position relative to the middle of `window`.
pub x: S,
/// *y* position relative to the middle of `window`.
pub y: S,
/// A map describing the state of each mouse button.
pub buttons: ButtonMap,
}
/// Whether the button is up or down.
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum ButtonPosition<S = DefaultScalar> {
/// The button is up (i.e. pressed).
Up,
/// The button is down and was originally pressed down at the given `Point2`.
Down(Point2<S>),
}
/// Stores the state of all mouse buttons.
///
/// If the mouse button is down, it stores the position of the mouse when the button was pressed
#[derive(Copy, Clone, Debug, PartialEq)]
pub struct ButtonMap<S = DefaultScalar> {
buttons: [ButtonPosition<S>; NUM_BUTTONS],
}
/// An iterator yielding all pressed buttons.
#[derive(Clone)]
pub struct PressedButtons<'a, S: 'a = DefaultScalar> {
buttons: std::iter::Enumerate<std::slice::Iter<'a, ButtonPosition<S>>>,
}
impl<S> Mouse<S>
where
S: BaseFloat,
{
/// Construct a new default `Mouse`.
pub fn new() -> Self {
Mouse {
window: None,
buttons: ButtonMap::new(),
x: S::zero(),
y: S::zero(),
}
}
/// The position of the mouse relative to the middle of the window in focus..
pub fn position(&self) -> Point2<S> {
Point2 {
x: self.x,
y: self.y,
}
}
}
impl<S> ButtonPosition<S>
where
S: BaseFloat,
{
/// If the mouse button is down, return a new one with position relative to the given `xy`.
pub fn relative_to(self, xy: Point2<S>) -> Self {
match self {
ButtonPosition::Down(pos) => {
let rel_p = pos - xy;
ButtonPosition::Down(Point2 {
x: rel_p.x,
y: rel_p.y,
})
}
button_pos => button_pos,
}
}
/// Is the `ButtonPosition` down.
pub fn is_down(&self) -> bool {
match *self {
ButtonPosition::Down(_) => true,
_ => false,
}
}
/// Is the `ButtonPosition` up.
pub fn is_up(&self) -> bool {
match *self {
ButtonPosition::Up => true,
_ => false,
}
}
/// Returns the position at which the button was pressed.
pub fn if_down(&self) -> Option<Point2<S>> {
match *self {
ButtonPosition::Down(xy) => Some(xy),
_ => None,
}
}
}
impl<S> ButtonMap<S>
where
S: BaseFloat,
{
/// Returns a new button map with all states set to `None`
pub fn new() -> Self {
ButtonMap {
buttons: [ButtonPosition::Up; NUM_BUTTONS],
}
}
/// Returns a copy of the ButtonMap relative to the given `Point`
pub fn relative_to(self, xy: Point2<S>) -> Self {
self.buttons
.iter()
.enumerate()
.fold(ButtonMap::new(), |mut map, (idx, button_pos)| {
map.buttons[idx] = button_pos.relative_to(xy);
map
})
}
/// The state of the left mouse button.
pub fn left(&self) -> &ButtonPosition<S> {
&self[Button::Left]
}
/// The state of the middle mouse button.
pub fn middle(&self) -> &ButtonPosition<S> {
&self[Button::Middle]
}
/// The state of the right mouse button.
pub fn right(&self) -> &ButtonPosition<S> {
&self[Button::Right]
}
/// Sets the `Button` in the `Down` position.
pub fn press(&mut self, button: Button, xy: Point2<S>) {
self.buttons[button_to_idx(button)] = ButtonPosition::Down(xy);
}
/// Set's the `Button` in the `Up` position.
pub fn release(&mut self, button: Button) {
self.buttons[button_to_idx(button)] = ButtonPosition::Up;
}
/// An iterator yielding all pressed mouse buttons along with the location at which they
/// were originally pressed.
pub fn pressed(&self) -> PressedButtons<S> {
PressedButtons {
buttons: self.buttons.iter().enumerate(),
}
}
}
impl<S> std::ops::Index<Button> for ButtonMap<S> {
type Output = ButtonPosition<S>;
fn index(&self, button: Button) -> &Self::Output {
&self.buttons[button_to_idx(button)]
}
}
impl<'a, S> Iterator for PressedButtons<'a, S>
where
S: BaseFloat,
{
type Item = (Button, Point2<S>);
fn next(&mut self) -> Option<Self::Item> {
while let Some((idx, button_pos)) = self.buttons.next() {
if let ButtonPosition::Down(xy) = *button_pos {
return Some((idx_to_button(idx), xy));
}
}
None
}
}
fn idx_to_button(i: usize) -> Button {
match i {
n @ 0...5 => Button::Other(n as u8),
6 => Button::Left,
7 => Button::Right,
8 => Button::Middle,
_ => Button::Other(std::u8::MAX),
}
}
fn button_to_idx(button: Button) -> usize {
match button {
Button::Other(n) => n as usize,
Button::Left => 6,
Button::Right => 7,
Button::Middle => 8,
}
}
}
/// Tracked durations related to the App.
pub mod time {
/// The state of time tracked by the App.
#[derive(Copy, Clone, Debug, Default, Eq, PartialEq, Hash)]
pub struct Time {
/// The duration since the app started running.
pub since_start: std::time::Duration,
/// The duration since the previous update.
pub since_prev_update: std::time::Duration,
}
}