Flutter orientation

SystemChrome.setPreferredOrientations([
    DeviceOrientation.portraitDown,
    DeviceOrientation.portraitUp,
  ]);

Flutter display widget based on device orientation

build(BuildContext context) {
    final isLandscape = MediaQuery.of(context).orientation ==
        Orientation.landscape; // check if the orientation is landscape
        
        
        // further down your code you can use 'if' or 'ternary' or both
        if (!isLandscape) txListWidget,
            if (isLandscape)
            _ternaryCondition ? _showFirstWidget : _showSecondWidget
            // the above widgets would be in a 'Row' or 'Column'
        }

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