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Windows Phone 8 : Orientation and the PhoneApplicationPage Class (part 3) - Setting Page Orientation at Runtime

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4/28/2014 1:32:56 AM

Setting Page Orientation at Runtime

As you saw in the previous section, the Orientation property of the PhoneApplicationPage class cannot be assigned at runtime. Another approach is required to change the page orientation. For this turn to the SupportedOrientations property, which is assignable at runtime.

To recap, the SupportedOrientations property defines the allowed orientation or orientations of the page, which can be Portrait, Landscape, or PortraitOrLandscape.

Setting the SupportedOrientations property to the desired orientation forces the page to be shown in that orientation. For example, if the page is being viewed in portrait orientation, and you want to change the page orientation to landscape, you can set the SupportedOrientations to Landscape, thereby restricting the allowed orientation to landscape and forcing the frame to change the orientation to landscape.

This technique is demonstrated in the OrientationView page in the downloadable sample code (see Figure 2).

Image

FIGURE 2 Forcing the orientation of a page.

The OrientationView class’s Switch Supported Orientation button alternates between the three SupportedPageOrientation values. This is performed in the button’s Tap event handler, demonstrating how the orientation can be forcibly set by restricting the orientation, as shown in the following excerpt:

void Button_Tap(object sender, GestureEventArgs e)
{
    switch (SupportedOrientations)
    {
        case SupportedPageOrientation.Landscape:
            SupportedOrientations = SupportedPageOrientation.Portrait;
            break;
        case SupportedPageOrientation.Portrait:
            SupportedOrientations = SupportedPageOrientation.PortraitOrLandscape;
            break;
        default:
            SupportedOrientations = SupportedPageOrientation.Landscape;
            break;
    }
}

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