[Marble-devel] How does LayerInterface ask for an update?

[Bernhard Beschow]

Hi Kishore,

> I am porintg some old code that user the customPaint method to instead use 
> LayerInterface. The one part that i am stuck with is how does LayerInterface 
> inform the widget that its needs update?
> 
> Previously, with customPaint() as the whole paint and data to be information 
> to be painted was within the widget, i could simply call update() on the 
> widget. Now that i have modularized the code, and layers are separated from 
> the widget (they have no pointer to it) i was wondering how this is to be 
> achieved?
> 
> Am i misusing the API? I do not want to create a marble plugin and install it 
> into the marble install directories for it to work properly. Is there a 
> solution?

Yes, there is a solution :) :

You could add a signal to your LayerInterface implementation, e.g. "requestUpdate()" and call that instead of MarbleWidget::update(). When adding your layer to MarbleWidget, you connect that signal to MarbleWidget::update().

HTH,
Bernhard