Is there a way to create an event handler for when a property changes ? I have a property define in the QML: property double waterDepth: vehicle.data.totalWaterDepth vehicle.data.totalWaterDepth is somewhere in the C++, I haven't been able to locate it. What I would like to do is create a handler to mange when the value changes. Something like: onWaterDepthChanges: { ... }

Hi @ SPlatten , You should also have signals with totalWaterDepth in C++ which can help for value change updates

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QML property on change ?

Unsolved QML and Qt Quick

21 Posts 8 Posters 7.0k Views 2 Watching

G GrecKo

@SPlatten said in QML property on change ?:

@GrecKo , I tried that and it doesn't work, I think because the primitive type double is not an object.

That doesn't prevent it from triggering change signals.

Maybe your vehicle or data is changed in C++ without emitting any NOTIFY signal? if totalWaterDepth is in a QQmlPropertyMap it shouldn't be able to be changed without emitting a signal so that leaves the other two.

How do you know the final value changes?
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SPlatten

wrote on last edited by

#21

@GrecKo , I see if update on the QML front end.
Kind Regards,
Sy
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