Comments (18)
IMHO, I don’t think you need more than Hive.watch
. You can extend its usage for your own specific implementation (Provider, ScopeModel, InheritedWidget, StreamBuilder).
In my case, I am creating a stream from Hive.watch
so I can use a StreamBuilder
to observe state changes on specific widgets.
Stream<List<String>> watchChanges() {
return Hive.box(boxNameKey)
.watch(key: recentQueriesKey)
.map((event) => fetchQueries());
}
You can create your own ChangeNotifier
and observe changes with watch
to notifyListeners().
But what I really think is this watch should return the initial value when we listen to a specific key. Currently I have to watch changes and do a separate fetch to receive all values since the very beginning.
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Maybe like
HiveListenable darkMode = HiveListenable(myBox, 'darkMode');
and
ValueListenableBuilder(
valueListenable: darkMode,
builder: (BuildContext context, bool darkMode, Widget child) {
return ListTile(
title: child,
trailing: Switch(
value: darkMode,
onChanged: (bool changed) {
myBox.put('darkMode', changed);
// Or maybe this.darkMode.set(changed);
},
),
);
},
/*
For this example, Text isnt that expensive,
but you can put more expensive widgets here
and they wont constantly rebuild when you want to
change JUST the switch.
*/
child: Text('Dark Mode'),
),
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You are right, the reason why I didn't implement that are lazy boxes.
Since lazy boxes don't keep the values in memory, they would need to be fetched for each subscribe call.
I'm not sure how to solve this.
Edit: Maybe using a sendInitialEvent
parameter for the watch()
method. What do you think?
from hive.
This has finally been implemented:
ValueListenableBuilder(
valueListenable: Hive.box('settings').listenable(),
builder: (context, box, widget) {
return Center(
child: Switch(
value: box.get('darkMode', defaultValue: false),
onChanged: (val) => box.put('darkMode', val),
),
);
},
)
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@MichaelPriebe You can use yourBox.listenable(key: 'someKey')
from hive.
You can just use something like this:
var box = Hive.box('yourBox');
box.watch('yourKey').listen((e) {
setState(() {});
});
This will update your widget when yourKey
changes.
from hive.
setState is not the best practice though, often rebuilds more than what you need.
from hive.
Could you provide a sample of what you have in mind?
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I understand, thanks...
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I created the HiveBuilder
how do you like it?
Here is a simple example how it works.
from hive.
I was thinking like this:
class HiveNotifier extends ValueNotifier {
final Box box;
final String key;
HiveNotifier(this.box, this.key) : super(box.get(key)) {
box.watch(key: key).listen((BoxEvent event) {
if (event.value == value) return;
value = event.value;
});
}
@override
get value => box.get(key);
@override
set value(newValue) {
box.put(key, value);
notifyListeners();
}
}
Didn't try to see if it works though.
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IMHO, I don’t think you need more than Hive.watch. You can extend its usage for your own specific implementation (Provider, ScopeModel, InheritedWidget, StreamBuilder).
I agree.
But what I really think is this watch should return the initial value when we listen to a specific key. Currently I have to watch and map to receive all values since the very beginning.
I don't quite undestand what you mean. Do you want to receive all events for a key since the box has been opened? Hive would need to keep them for any key in case you watch that key anytime later.
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Sorry, I’ve updated my comment.
I would like that watch
had a seedValue for the time I subscribe to it, but only when I am listening to a specific key, like a snapshot.
Otherwise I have to do listen and fetch for the first content not be null, as you do on WatchBoxWidget
, this shouldn’t be necessary.
from hive.
What about an optional param where we can ask for this initialValue? So it would not be a problem to fetch it again for lazyBox under the hood as in cases like mine we will have to fetch it anyway.
from hive.
Hahah exactly
from hive.
Okay let's do that 👍
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Thanks @leisim! Hopefully we can get key listeners too because I would rather widgets not rebuild when an irrelevant setting changes.
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