protected override void OnNavigatedTo(NavigationEventArgs e)
{
thisViewControl = (ViewLifetimeControl) e.Parameter;
mainViewId = ((App)App.Current).MainViewId;
mainDispatcher = ((App)App.Current).MainDispatcher;
// When this view is finally release, clean up state
thisViewControl.Released += ViewLifetimeControl_Released;
}
private async void StartProjecting(DeviceInformation selectedDisplay)
{
// If projection is already in progress, then it could be shown on the monitor again
// Otherwise, we need to create a new view to show the presentation
if (this.ProjectionViewPageControl == null)
{
// First, create a new, blank view
await CoreApplication.CreateNewView().Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
// ViewLifetimeControl is a wrapper to make sure the view is closed only
// when the app is done with it
this.ProjectionViewPageControl = ViewLifetimeControl.CreateForCurrentView();
// Assemble some data necessary for the new page
var initData = new ProjectionViewPageInitializationData();
initData.MainDispatcher = thisDispatcher;
initData.ProjectionViewPageControl = this.ProjectionViewPageControl;
initData.MainViewId = thisViewId;
// Display the page in the view. Note that the view will not become visible
// until "StartProjectingAsync" is called
var rootFrame = new Frame();
rootFrame.Navigate(typeof(ProjectionViewPage), initData);
Window.Current.Content = rootFrame;
// The call to Window.Current.Activate is required starting in Windos 10.
// Without it, the view will never appear.
Window.Current.Activate();
});
}
try
{
// Start/StopViewInUse are used to signal that the app is interacting with the
// view, so it shouldn't be closed yet, even if the user loses access to it
rootPage.ProjectionViewPageControl.StartViewInUse();
// Show the view on a second display that was selected by the user
if (selectedDisplay != null)
{
await ProjectionManager.StartProjectingAsync(rootPage.ProjectionViewPageControl.Id, thisViewId, selectedDisplay);
}
else
{
await ProjectionManager.StartProjectingAsync(rootPage.ProjectionViewPageControl.Id, thisViewId);
}
rootPage.ProjectionViewPageControl.StopViewInUse();
}
catch (InvalidOperationException)
{
System.Diagnostics.Debug.WriteLine("Start projection failed");
}
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
var initData = (ProjectionViewPageInitializationData)e.Parameter;
// The ViewLifetimeControl is a convenient wrapper that ensures the
// view is closed only when the user is done with it
thisViewControl = initData.ProjectionViewPageControl;
mainDispatcher = initData.MainDispatcher;
mainViewId = initData.MainViewId;
// Listen for when it's time to close this view
thisViewControl.Released += thisViewControl_Released;
}
// Loop through the collection to find the view ID
// This should only be run on the main thread.
bool TryFindViewLifetimeControlForViewId(int viewId, out ViewLifetimeControl foundData)
{
foreach (var ViewLifetimeControl in SecondaryViews)
{
if (ViewLifetimeControl.Id == viewId)
{
foundData = ViewLifetimeControl;
return true;
}
}
foundData = null;
return false;
}