Bindable properties where there in Qt5, Qt6 added them to lower level code.
So at minimum since 2012.
But, Properties where there since Qt 3 so 2001 and i was doing property binding whith them at the time, they where just not published with the lib, but it was a pattern known to those using Qt.
But like other have said, Xerox that pioneered ui was also doing them in the 70's
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Bindable properties where there in Qt5, Qt6 added them to lower level code.
So at minimum since 2012.
But, Properties where there since Qt 3 so 2001 and i was doing property binding whith them at the time, they where just not published with the lib, but it was a pattern known to those using Qt.
But like other have said, Xerox that pioneered ui was also doing them in the 70's