fix: resolve android touch event bleed between sandbox and host surfaces#33
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May 13, 2026 11:48
Touch events from a sandbox Fabric surface were leaking into the host surface on Android. Both surfaces share the same global React view tag namespace, so when a sandbox view and host view are assigned the same tag, touch events targeting that tag in the sandbox are also resolved by the host's Fabric renderer. Fix: intercept touch events at the Window level before they reach the host's ReactSurfaceView. If a touch lands inside a sandbox's bounds, route it directly to the sandbox's child surface view, bypassing the host dispatch entirely. Includes a touch-test-demo app to reproduce and verify the fix. Ref: callstackincubator#27
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Touch events from a sandbox Fabric surface were leaking into the host surface on Android. Both surfaces share the same global React view tag namespace, so when a sandbox view and host view are assigned the same tag, touch events targeting that tag in the sandbox are also resolved by the host's Fabric renderer.
Fix: intercept touch events at the Window level before they reach the host's ReactSurfaceView. If a touch lands inside a sandbox's bounds, route it directly to the sandbox's child surface view, bypassing the host dispatch entirely.
Includes a touch-test-demo app to reproduce and verify the fix.
Ref: #27
Videos:
and_touch_with_bug_small.mp4
and_touch_with_fix_small.mp4