RxTextView.textChangesWithBefore

[wKovacs64]

New to RxJava and RxBinding, I started out by doing some user input validation previously implemented via TextWatcher. I realized while attempting to leverage the filter operator that the Observable returned from RxTextView.textChanges only emits the new text. Would it be beneficial to add a similar Observable that also emitted the before value (from TextWatcher#beforeTextChanged)?

[JakeWharton]

Can you show an example of how you would use it?

On Sun, Sep 13, 2015, 7:27 PM Justin Hall notifications@github.com wrote:

New to RxJava and RxAndroid, I started out by doing some user input
validation previously implemented via TextWatcher. I realized while
attempting to leverage the filter operator that the Observable returned
from RxTextView.textChanges only emits the new text. Would it be
beneficial to add a similar Observable that also emitted the before value
(from TextWatcher#beforeTextChanged
https://developer.android.com/reference/android/text/TextWatcher.html#beforeTextChanged%28java.lang.CharSequence,%20int,%20int,%20int%29
)?

—
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#137.

[wKovacs64]

I was thinking something like:

RxTextView.textChangesWithBefore(textView)
        .filter(this::compareBeforeAndAfter)
        .subscribe(beforeAndAfterPair -> {
            // ...
        });

Just imagining Pair in the example here, haven't put much thought into the best way to represent the two values.

[JakeWharton]

Got it. Will look into adding.

On Sun, Sep 13, 2015, 9:05 PM Justin Hall notifications@github.com wrote:

I was thinking something like:

RxTextView.textChangesWithBefore(textView)
.filter(this::compareBeforeAndAfter)
.subscribe(beforeAndAfterPair -> {
// ...
});

Just imagining Pair in the example here, haven't put much thought into
the best way to represent the two values.

—
Reply to this email directly or view it on GitHub
#137 (comment)
.

[wKovacs64]

Cool, thanks for considering it.

[xfumihiro]

@wKovacs64 Both before and after text change event bindings are added in #145.
You can then use combine operators with filter to do the job.