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Xamarin.Forms TwoPaneView layout

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The TwoPaneView control is available in the Xamarin.Forms.DualScreen NuGet preview. The following code shows a simple XAML example:

<ContentPage xmlns:dualScreen="clr-namespace:Xamarin.Forms.DualScreen;assembly=Xamarin.Forms.DualScreen">
    <dualScreen:TwoPaneView>
        <dualScreen:TwoPaneView.Pane1>
            <StackLayout>
                <Label Text="Pane1 Content" />
            </StackLayout>
        </dualScreen:TwoPaneView.Pane1>
        <dualScreen:TwoPaneView.Pane2>
            <StackLayout>
                <Label Text="Pane2 Content" />
            </StackLayout>
        </dualScreen:TwoPaneView.Pane2>
    </dualScreen:TwoPaneView>
</ContentPage>

By default the TwoPaneView will attempt to always render both panes, which means that when the app is running on a single-screen, the view will be split between the two panes. The following properties can be used to affect the layout when it's only rendering on one screen:

  • MinTallModeHeight – indicates the minimum height the control must be to enter tall mode.
  • MinWideModeWidth – indicates the minimum width the control must be to enter wide mode.
  • Pane1Length – sets the width of Pane1 in Wide mode, the height of Pane1 in Tall mode, and has no effect in SinglePane mode.
  • Pane2Length – sets the width of Pane2 in Wide mode, the height of Pane2 in Tall mode, and has no effect in SinglePane mode.

On the Surface Duo, applications can be spanned across two screens. The TwoPaneView control has additional properties that determine where the two panes are rendered in relation to each other (in both single- or dual-screen):

  • TallModeConfiguration – when in tall mode, the panes can be Top/Bottom, Bottom/Top, or a single pane only can be shown.
  • WideModeConfiguration – when in wide mode, the panes can be Left/Right, Right/Left, or a single pane only.
  • PanePriority – whether to show Pane1 or Pane2 if in SinglePane mode is chosen for tall or wide mode.

There are three display modes:

  • SinglePane – only one pane is currently visible.
  • Wide – the two panes are laid out horizontally. One pane is on the left and the other is on the right. On the Surface Duo the two screens are in portrait mode.
  • Tall – the two panes are laid out vertically. One pane is on top and the other is on bottom. On the Surface Duo the two screens are in landscape mode.

Read more in the Xamarin documentation. Some of the design considerations in the UWP TwoPaneView documentation also apply to the Xamarin control.

Troubleshooting

If you observe unexpected behavior or layout from TwoPaneView, check the set-up instructions, including the Init method and ConfigurationChanges attribute.