[Fabric] Implement the onPressIn property for the fabric implementation of TextInput

[HariniMalothu17]

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Why

Implement the onPressIn property for the fabric implementation of TextInput.
This property was available in RNW Paper via TextInputViewManager

See https://reactnative.dev/docs/textinput#onpressin for details.

Resolves #13127

What

Implemented the onPressIn property for the fabric implementation of TextInput.

Screenshots

Recording.2025-04-04.025511.mp4

Testing

Tested using playground-composition App,
Added an alert prompt to the onPressIn event when the TextInput is pressed.

Changelog

Yes

Added a brief summary of onPressIn to use in the release notes for the next release.

Microsoft Reviewers: Open in CodeFlow

[TatianaKapos]

This is great! Can we also add an e2etest to make this change more stable in the future?

Instructions here: https://github.com/microsoft/react-native-windows/wiki/E2E-Testing-(Fabric)
Example PRs: https://github.com/microsoft/react-native-windows/pull/12746/files#diff-4e06b21930c2eef3b60c891c6816afb6379337dadef22b8f33e6667ecbba2f53 and https://github.com/microsoft/react-native-windows/pull/12771/files#diff-589ea5c45c3c5c3bf5e8ef865c8e86cc1c42719a07bbc316dc3e3d879954aa20

It also looks like rntester already has a TextInput you can refer too!

[jonthysell]

I think more than TextInput will require an onPressIn event and parts of this needs to be implemented up in HostPlatformViewEventEmitter rather than directly here.

For reference WindowsTextInputEventEmitter inherits from ViewEventEmitter which inherits from HostPlatformViewEventEmitter which inherits from BaseViewEventEmitter. HostPlatformViewEventEmitter is where we implement eventcode that multiple components will need.

[jonthysell]

The default version of this function should be implemented in HostPlatformViewEventEmitter and should dispatch to "pressIn".

Then, you should override that function here in WindowsTextInputEventEmitter to instead dispatch the event to "textInputPressIn".

See other comments for details.

[jonthysell]

This struct should instead be something like PressEvent and put it up in the HostPlatformViewEventEmitter for re-use elsewhere.

See https://reactnative.dev/docs/pressevent for the other fields the event should have in JS - I'm not sure if some (all?) of these need to be implemented in native code (some may be added in JS). You might need to update your test to display the event and verify what's present.

See other comments for details.

[jonthysell]

This should be implemented as a virtual fucntion in HostPlatformViewEventEmitter for re-use elsewhere.

See other comments for details.

[jonthysell]

This is probably okay here for now, but it might need to be moved up into a more common place too, like in ComponentView.h

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