Hide QwtLegend after inserting it???

[freeman_w]

Hi there...

I am trying to hide the legend in my plot AFTER the insertion of it.
I tried the hide() or setVisible() methods but they don't work with the legend!
Is it somehow possible? Is there a method that helps on that?

Using Qwt 6.0.1!!!

Thanks in advance...

[Uwe]

plot->insertLegend( NULL );

plot->insertLegend( NULL );

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HTH,
Uwe

[freeman_w]

Unfortunately it doesn't help Uwe...
Program can't even start.
Is there any possibility that this kind of functionality will get implemented in the future???

[Uwe]

It is implemented - whatever the reason of your crash is, you are the only one who can fix it.

Uwe

[freeman_w]

Correction

It helps:

plot->insertLegend( NULL );

plot->insertLegend( NULL );

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I probably didn't compile the project clean.

Thanks for the help...

[Alekon]

But what is a reason to not support show()/hide()? QwtAbstractLegend inherits QWidget, where show()/hide() are public methods. Ignoring show()/hide() breaks expected behavior. I am assuming this is due to QwtPlotLayout, which is not a QLayout.

Qwt looks designed very well with high level of customization/flexibility. And there is so-called "naked" interface, where a component provides direct access to its subcomponents, rather then expose only subcomponents properties (and so have full cotrol over side effects). Being "naked", a component must fully observe its subcomponents (via signals, eventFilter(), weak pointers, etc.).

So, one would expect

legend->setParent(NULL)

legend->setParent(NULL)

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acts the same as

plot->insertLegend( NULL );

plot->insertLegend( NULL );

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Is it OK, or breaks the code?

Note: In the first case QwtPlot must observe its legend (e.g. via handling ChildRemoved events).

Does Qwt have such observation everywhere in its code?
Thanks, Alex