public MainPage(IDeviceDisplay deviceDisplay)
{
this.deviceDisplay = deviceDisplay;
this.InitializeComponent();
NavigationPage.SetHasNavigationBar(this, false);
this.Appearing += this.OnAppearing;
}
public static void SetCurrent(IDeviceDisplay?implementation)
{
lock (locker)
{
if (currentImplementation == implementation)
{
return;
}
var newImplementation = implementation ?? new DeviceDisplayImplementation();
var oldImplementation = currentImplementation;
currentImplementation = newImplementation;
if (oldImplementation is not null)
{
oldImplementation.MainDisplayInfoChanged -= OnMainDisplayInfoChanged;
var wasAlwaysOn = oldImplementation.KeepScreenOn;
if (wasAlwaysOn)
{
oldImplementation.KeepScreenOn = false;
newImplementation.KeepScreenOn = true;
}
var wasRunning = MainDisplayInfoChangedInternal != null;
if (wasRunning)
{
oldImplementation.StopScreenMetricsListeners();
newImplementation.StartScreenMetricsListeners();
}
}
newImplementation.MainDisplayInfoChanged += OnMainDisplayInfoChanged;
SetCurrent(newImplementation.GetMainDisplayInfo());
}
}
static DeviceDisplay()
{
currentImplementation = new DeviceDisplayImplementation();
currentImplementation.MainDisplayInfoChanged += OnMainDisplayInfoChanged;
}
