手势（gesture）、鼠标（cursor）
GestureDetector： can get all actions
MouseRegion : can detect cursor position in its children. https://stackoverflow.com/questions/64500727/flutter-get-mouse-position-in-desktop-and-web
GestureDetector： can get all actions
MouseRegion : can detect cursor position in its children. https://stackoverflow.com/questions/64500727/flutter-get-mouse-position-in-desktop-and-web
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