The signal sent when the record, the history, or the receiver changes.
When one of these states changes, they will send a corresponding signal to the user.
For example, if the record can no longer redo any commands, it sends a Redo(false)
signal to tell the user.
let history = History::builder()
.connect(|signal| match signal {
Signal::Undo(on) => println!("undo: {}", on),
Signal::Redo(on) => println!("redo: {}", on),
Signal::Saved(on) => println!("saved: {}", on),
Signal::Cursor { old, new } => println!("cursor: {} -> {}", old, new),
Signal::Root { old, new } => println!("root: {} -> {}", old, new),
})
.default();
Says if the record can undo.
This signal will be emitted when the records ability to undo changes.
Says if the record can redo.
This signal will be emitted when the records ability to redo changes.
Says if the receiver is in a saved state.
This signal will be emitted when the record enters or leaves its receivers saved state.
Says if the current command has changed.
This signal will be emitted when the cursor has changed. This includes
when two commands have been merged, in which case old == new
.
Fields of Cursor
Says if the current branch, or root, has changed.
This is only emitted from History
.
Fields of Root
This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
Performs copy-assignment from source
. Read more
This method returns an Ordering
between self
and other
. Read more
fn max(self, other: Self) -> Self | 1.21.0 [src] |
Compares and returns the maximum of two values. Read more
fn min(self, other: Self) -> Self | 1.21.0 [src] |
Compares and returns the minimum of two values. Read more
Formats the value using the given formatter. Read more
Feeds this value into the given [Hasher
]. Read more
Feeds a slice of this type into the given [Hasher
]. Read more
Creates owned data from borrowed data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static