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  1. Qt
  2. QTBUG-82306

Qt meta-object system and inheritance of Q_GADGET classes

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    • Windows
    • 1029b2b9f3d0ff88c0900fbfec2fac873aa6bcd4

    Description

      Q_GADGET.ZIP

      When Q_GADGET class inherits other Q_GADGET class, some Q_INVOKABLE methods in derived class are inaccessible in QML code. Attached program produces the following output:

      qml: item.prop1: 1
qml: item.prop2: 2
qml: item.prop3: 3
qml: item.prop4: 4
qml: item.prop5: 5
qml: item.method1: function() { [native code] }
qml: item.method2: function() { [native code] }
qml: item.method3: function() { [native code] }
qml: item.method4: undefined
qml: item.method5: function() { [native code] }

      If line (1) in Items.h is uncommented, method4 becomes accessible:

      qml: item.prop1: 1
qml: item.prop2: 2
qml: item.prop3: 3
qml: item.prop4: 4
qml: item.prop5: 5
qml: item.method1: function() { [native code] }
qml: item.method2: function() { [native code] }
qml: item.method3: function() { [native code] }
qml: item.method4: function() { [native code] }
qml: item.method5: function() { [native code] }

      Results may vary, depending on how many methods are in the base class.

      Qt 5.14.1 is not the first version with this bug. It was at least in Qt 5.9.x and later.

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            qt.team.quick.subscriptions Qt Quick and Widgets Team
            s.m. s. m.
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              Created:
              Updated:
              Resolved:

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