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README.md 4762b62e7d Publish DEPS for 106.0.5249.13 1 year ago

README.md

Android Stylus Handwriting to HTML text input

This directory contains files and classes needed to support the Stylus Handwriting recognition feature provided by the Android Platform, used to commit text to html inputs.

Since Android Platform cannot recognize the location of HTML input fields in Chrome Tab or Web view, Stylus writing service expects Chrome to detect stylus writable input field and initiate the stylus handwriting recognition. System settings would be used to determine the status of stylus writing service on the device. There are 2 different ways in which Chromium would interact with the platform’s writing services:

1. Android Stylus writing

Android Platform provides APIs to interact with the stylus writing system so that recognition can be started in HTML input fields. Then the platform uses the InputConnection created for the HTML input field to commit the recognized text. Stylus input gestures like deleting text or adding spaces is also supported with feedback from Chromium about the Input field location and the text around the gesture coordinates. This feature is currently available in Android version T under Developer options only and will be available fully from Android U.

2. Direct Writing service available only in Samsung Platform

This feature is exposed to webview and Chrome from Samsung Platform via service aidls defined in the //content/public directory. Direct writing service expects Chrome to implement the service callback Interface and forward touch events to the service when writing is detected over and input field. Here, the resposibility of committing the recognized text lies with Chromium and is handled via the ImeAdapter class. The information about Input field bounds, position on screen, caret position are also expected to be provided in the service callback implementation. The Direct Writing service is available on select devices starting Android version R.

Stylus Gestures are detected by the service and gesture data like gesture coordinates and gesture type, whether it is to remove or add text near current input text, is sent to Chromium to handle the gesture and take corresponding input action.