Plot doesn't display until Window resize on Xamarin.Forms UWP

[clarkis117]

A possible bug with the Oxyplot for Windows UWP , PlotView interacting with the Xamarin.Forms View Renderer. The plot doesn't display until after the window resizes. After the window resizes the UWP canvas draws the plot.

[objorke]

I have updated the Xamarin.Forms/SimpleDemo example for UWP, and see the same error there.

[clarkis117]

@objorke okay I've been able to pin this bug down to a single point. It's actually in the Oxyplot.Windows project in the implementation of Windows.UI.Xaml.Controls.Control class for PlotView. More specifically, it is in the method override for ArrangedOverride(Size finalSize). The bug being that in a Xamarin Forms UWP project UpdateVisuals() is not being called until the Window is resized; whereas, in a Windows (non-Xamarin.Forms project) it is being called without the Window needing resized.

https://github.com/oxyplot/oxyplot/blob/master/Source/OxyPlot.Windows/PlotView.cs#L799

[clarkis117]

From PR: I thinking one of the main problems is that the size parameter is only provided to the protected override Size ArrangeOverride(Size finalSize) method once, and in all my debugging it's only been 0 for both x and y thus causing UpdateVisuals() to not be called.

[clarkis117]

@objorke It seems that in the Windows PlotView, when being invoked by the Xamarin.Forms Renderer, PlotView.ActualHeight and PlotView.ActualWidth are not set before the first arrange pass.

[objorke]

This should be solved in OxyPlot.Xamarin.Forms.1.1.0-unstable0011 (nuget.org)

[objorke]

@clarkis117 can we close this issue?