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|
use std::collections::HashMap;
use ecs::extension::Collector as ExtensionCollector;
use ecs::sole::Single;
use ecs::Sole;
use crate::event::{PreUpdate as PreUpdateEvent, Start as StartEvent};
use crate::vector::Vec2;
use crate::window::{Key, KeyState, Window};
#[derive(Debug, Clone, Default, Sole)]
pub struct Keys
{
map: HashMap<Key, KeyState>,
}
impl Keys
{
#[must_use]
pub fn new() -> Self
{
Self::default()
}
#[must_use]
pub fn get_key_state(&self, key: Key) -> KeyState
{
self.map.get(&key).copied().unwrap_or(KeyState::Released)
}
pub fn set_key_state(&mut self, key: Key, key_state: KeyState)
{
if matches!(key_state, KeyState::Released) {
self.map.remove(&key);
return;
}
if matches!(key_state, KeyState::Repeat) {
return;
}
self.map.insert(key, key_state);
}
#[must_use]
pub fn is_anything_pressed(&self) -> bool
{
!self.map.is_empty()
}
}
#[derive(Debug, Default, Clone, Sole)]
pub struct Cursor
{
pub position: Vec2<f64>,
pub has_moved: bool,
}
#[derive(Debug, Clone, Sole)]
pub struct CursorFlags
{
/// This flag is set in two situations:
/// A: The window has just started
/// B: The window has gained focus again after losing focus.
///
/// This flag only lasts a single tick then it is cleared (at the beginning of the
/// next tick).
pub is_first_move: CursorFlag,
}
impl Default for CursorFlags
{
fn default() -> Self
{
Self {
is_first_move: CursorFlag { flag: true, ..Default::default() },
}
}
}
#[derive(Debug, Default, Clone)]
pub struct CursorFlag
{
pub flag: bool,
pub pending_clear: bool,
}
impl CursorFlag
{
pub fn clear(&mut self)
{
self.flag = false;
self.pending_clear = false;
}
}
/// Input extension.
#[derive(Debug, Default)]
pub struct Extension {}
impl ecs::extension::Extension for Extension
{
fn collect(self, mut collector: ExtensionCollector<'_>)
{
collector.add_system(StartEvent, initialize);
collector.add_system(PreUpdateEvent, maybe_clear_cursor_is_first_move);
collector.add_sole(Keys::default()).ok();
collector.add_sole(Cursor::default()).ok();
collector.add_sole(CursorFlags::default()).ok();
}
}
fn initialize(
keys: Single<Keys>,
cursor: Single<Cursor>,
cursor_flags: Single<CursorFlags>,
window: Single<Window>,
)
{
let keys_weak_ref = keys.to_weak_ref();
window.set_key_callback(move |key, _scancode, key_state, _modifiers| {
let keys_weak_ref = keys_weak_ref.clone();
let keys_ref = keys_weak_ref.access().expect("No world");
let mut keys = keys_ref.to_single();
keys.set_key_state(key, key_state);
});
let cursor_weak_ref = cursor.to_weak_ref();
window.set_cursor_pos_callback(move |cursor_position| {
let cursor_weak_ref = cursor_weak_ref.clone();
let cursor_ref = cursor_weak_ref.access().expect("No world");
let mut cursor = cursor_ref.to_single();
cursor.position = Vec2 {
x: cursor_position.x,
y: cursor_position.y,
};
cursor.has_moved = true;
});
let cursor_flags_weak_ref = cursor_flags.to_weak_ref();
window.set_focus_callback(move |is_focused| {
#[cfg(feature = "debug")]
tracing::trace!("Window is focused: {is_focused}");
let cursor_flags_ref = cursor_flags_weak_ref.access().expect("No world");
cursor_flags_ref.to_single().is_first_move.flag = is_focused;
});
}
fn maybe_clear_cursor_is_first_move(
cursor: Single<Cursor>,
mut cursor_flags: Single<CursorFlags>,
)
{
if cursor_flags.is_first_move.pending_clear {
#[cfg(feature = "debug")]
tracing::trace!("Clearing is_first_move");
// This flag was set for the whole previous tick so it can be cleared now
cursor_flags.is_first_move.clear();
return;
}
if cursor.has_moved && cursor_flags.is_first_move.flag {
#[cfg(feature = "debug")]
tracing::trace!("Setting flag to clear is_first_move next tick");
// Make this system clear is_first_move the next time it runs
cursor_flags.is_first_move.pending_clear = true;
}
}
|
