Xianyu Technology

Jun 15, 2022 · Mobile Development

Implementing Magnifier Mode and Reverse Selection in Flutter TextField

The article details how to add a native‑style magnifier loupe and support reverse text selection to Flutter’s TextField by using CompositedTransformTarget/Follower overlays with BackdropFilter rendering, extending TextSelectionOverlay and gesture builders, tracking drag state, and swapping selection offsets when handles cross.