blob: 4fc7293da37757400e453d313bf76e399c83e732 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
use super::DataCollection;
/// The [`FrozenState`] indicates whether the application state should be frozen. It is either not frozen or
/// frozen and containing a copy of the state at the time.
pub enum FrozenState {
NotFrozen,
Frozen(Box<DataCollection>),
}
impl Default for FrozenState {
fn default() -> Self {
Self::NotFrozen
}
}
pub type IsFrozen = bool;
impl FrozenState {
/// Checks whether the [`FrozenState`] is currently frozen.
pub fn is_frozen(&self) -> IsFrozen {
matches!(self, FrozenState::Frozen(_))
}
/// Freezes the [`FrozenState`].
pub fn freeze(&mut self, data: Box<DataCollection>) {
*self = FrozenState::Frozen(data);
}
/// Unfreezes the [`FrozenState`].
pub fn thaw(&mut self) {
*self = FrozenState::NotFrozen;
}
/// Toggles the [`FrozenState`] and returns whether it is now frozen.
pub fn toggle(&mut self, data: &DataCollection) -> IsFrozen {
if self.is_frozen() {
self.thaw();
false
} else {
self.freeze(Box::new(data.clone()));
true
}
}
}
|
