Inheritance Cycle

Component Is Part Of An Inheritance Cycle

What happened?

A component inherited directly or indirectly from itself.

Usually, Components can inherit properties, methods, signals and enums from other components.

If a component inherits itself directly or indirectly through another base component, then it forms an inheritance cycle. The warning indicates that the current component is inside an inheritance cycle, see 范例 .

Why is this bad?

Components with inheritance cycles will not be created at runtime: they will be null instead.

范例

import QtQuick
Item {
    component Cycle: Cycle {} // not ok: directly inherits from itself
    component C: C2 {}        // not ok: indirectly inherits from itself
    component C2: C{}
}
					

You can fix this warning by breaking up the inheritance cycle

import QtQuick
Item {
    component Cycle: Item {}  // ok: does not inherit from itself
    component C: C2 {}        // ok: does not indirectly inherits from itself anymore
    component C2: Cycle{}
}
					

内容

• Component Is Part Of An Inheritance Cycle

• What happened?

• Why is this bad?

• 范例