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DualScreenService.uwp.cs
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DualScreenService.uwp.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Threading.Tasks;
using Windows.Foundation.Metadata;
using Windows.Graphics.Display;
using Windows.UI.ViewManagement;
#if UWP_18362
using Windows.UI.WindowManagement;
#endif
using Windows.UI.Xaml;
using Windows.UI.Xaml.Hosting;
using Xamarin.Forms;
using Xamarin.Forms.DualScreen;
using Xamarin.Forms.Internals;
using Xamarin.Forms.Platform.UWP;
[assembly: Dependency(typeof(DualScreenService))]
namespace Xamarin.Forms.DualScreen
{
internal partial class DualScreenService : IDualScreenService, Platform.UWP.DualScreen.IDualScreenService
{
public event EventHandler OnScreenChanged;
public DualScreenService()
{
if (Window.Current != null)
{
Window.Current.SizeChanged += OnCurrentSizeChanged;
}
}
public async Task<int> GetHingeAngleAsync()
{
if (!ApiInformation.IsMethodPresent("Windows.Devices.Sensors.HingeAngleSensor", "GetDefaultAsync"))
{
return await NoDualScreenServiceImpl.Instance.GetHingeAngleAsync();
}
#if UWP_18362
var sensor = await Windows.Devices.Sensors.HingeAngleSensor.GetDefaultAsync();
if (sensor == null)
return await NoDualScreenServiceImpl.Instance.GetHingeAngleAsync();
var currentReading = await sensor.GetCurrentReadingAsync();
return (int)currentReading.AngleInDegrees;
#else
return await NoDualScreenServiceImpl.Instance.GetHingeAngleAsync();
#endif
}
void OnCurrentSizeChanged(object sender, Windows.UI.Core.WindowSizeChangedEventArgs e)
{
OnScreenChanged?.Invoke(this, EventArgs.Empty);
}
public bool IsSpanned
{
get
{
var viewMode = (int)ApplicationView.GetForCurrentView().ViewMode;
switch (viewMode)
{
case 2:
return true;
default:
return false;
}
}
}
public DeviceInfo DeviceInfo => Device.info;
public bool IsLandscape
{
get
{
if (!IsSpanned)
return ApplicationView.GetForCurrentView().Orientation == ApplicationViewOrientation.Landscape;
#if UWP_18362
var displayRegions = ApplicationView.GetForCurrentView().GetDisplayRegions();
if (displayRegions.Count == 2)
{
// We are split in two panes. Layout accordingly
if (displayRegions[0].WorkAreaOffset.X != displayRegions[1].WorkAreaOffset.X)
{
return false;
}
else if (displayRegions[0].WorkAreaOffset.Y != displayRegions[1].WorkAreaOffset.Y)
{
return true;
}
else
{
return ApplicationView.GetForCurrentView().Orientation == ApplicationViewOrientation.Landscape;
}
}
#endif
return ApplicationView.GetForCurrentView().Orientation == ApplicationViewOrientation.Landscape;
}
}
public Size ScaledScreenSize
{
get
{
Windows.Foundation.Rect windowSize = Window.Current.Bounds;
return new Size(windowSize.Width, windowSize.Height);
}
}
public Rectangle GetHinge()
{
if (!ApiInformation.IsMethodPresent("Windows.UI.ViewManagement.ApplicationView", "GetSpanningRects"))
return Rectangle.Zero;
if (!IsSpanned)
return Rectangle.Zero;
var screen = DisplayInformation.GetForCurrentView();
#if UWP_18362
var applicationView = ApplicationView.GetForCurrentView();
List<Windows.Foundation.Rect> spanningRects = null;
#if UWP_19000
spanningRects = applicationView.GetSpanningRects().ToList();
#endif
if (spanningRects?.Count == 2)
{
if(!IsLandscape)
{
var x = spanningRects[0].Width;
var hingeWidth = spanningRects[1].X - x;
return new Rectangle(x, 0, hingeWidth, ScaledPixels(screen.ScreenHeightInRawPixels));
}
else
{
var y = spanningRects[0].Height;
var hingeHeight = spanningRects[1].Y - y;
return new Rectangle(0, y, ScaledPixels(screen.ScreenWidthInRawPixels), hingeHeight);
}
}
#endif
// fall back to hard coded
Rectangle returnValue = Rectangle.Zero;
if (IsLandscape)
{
if (IsSpanned)
returnValue = new Rectangle(0, 664 + 24, ScaledPixels(screen.ScreenWidthInRawPixels), 0);
else
returnValue = new Rectangle(0, 664, ScaledPixels(screen.ScreenWidthInRawPixels), 0);
}
else
returnValue = new Rectangle(720, 0, 0, ScaledPixels(screen.ScreenHeightInRawPixels));
return returnValue;
}
double ScaledPixels(double n)
=> n / DisplayInformation.GetForCurrentView().RawPixelsPerViewPixel;
public Point? GetLocationOnScreen(VisualElement visualElement)
{
var view = Platform.UWP.Platform.GetRenderer(visualElement);
if (view?.ContainerElement == null)
return null;
var ttv = view.ContainerElement.TransformToVisual(Window.Current.Content);
Windows.Foundation.Point screenCoords = ttv.TransformPoint(new Windows.Foundation.Point(0, 0));
return new Point(screenCoords.X, screenCoords.Y);
}
public object WatchForChangesOnLayout(VisualElement visualElement, Action action)
{
var view = Platform.UWP.Platform.GetRenderer(visualElement);
if (view?.ContainerElement == null)
return null;
EventHandler<object> layoutUpdated = (_, __) =>
{
action();
};
view.ContainerElement.LayoutUpdated += layoutUpdated;
return layoutUpdated;
}
public void StopWatchingForChangesOnLayout(VisualElement visualElement, object handle)
{
if (handle == null)
return;
var view = Platform.UWP.Platform.GetRenderer(visualElement);
if (view?.ContainerElement == null)
return;
if(handle is EventHandler<object> handler)
view.ContainerElement.LayoutUpdated -= handler;
}
}
}