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'
}