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qtdata-bindingqt4qmlqt5

Prevent QML Property Bindings when QML object isn't visible?

I'm working on a QML application that has a lot of property bindings: hundreds of objects are tracked and displayed in different forms like Qt3D/QCanvas.

When I'm on a separate page of the application those property bindings for x/y locations and relative sizes are still happening. How can I stop them? I know I could bind the properties based on whether they're visual or not but that is a lot of unnecessary code:

x: visible ? tracking.location(index).x : 0

I would have to wrap a ton of bindings like that. Any other solutions?

Solution

  • You can use the Binding element. You can specify target, property, value and condition to activate the binding.

    Binding on x {
    value: tracking.location(index).x
    when: visible
}