Adorner Not showing

Question

Adorner Not showing

BigH61 481

Hope you can help.

I am continuing to try and learn WPF and my current test project (which I have simplified significantly to demonstrate my problem) is to display an Adorner on a window when a button is clicked to open a new Window. When this window is displayed the Adorner is hidden.

My problem is the Adorner is not displaying.

Code for all but the Adorner below (for the purpose of this test Adorner style can be anything)

MainWindow Xaml

<Grid>     
<Grid.RowDefinitions>         
<RowDefinition Height="30"/>         
<RowDefinition Height="300"/>     
</Grid.RowDefinitions>     
<Button Grid.Row="0" Click="OnCreateNewWindow" Content="Create new Window1" Width="150"/>    
<ad:AdornedControl Grid.Row="1" Name="LoadingAdorner" >         
<ad:AdornedControl.AdornerContent>             
<local:WorkInProgress/>         
</ad:AdornedControl.AdornerContent>     
</ad:AdornedControl> </Grid>
MainWindow Xaml.cs

MainWindow Xaml.cs

private void OnCreateNewWindow(object sender, RoutedEventArgs e)         
{             
LoadingAdorner.ShowAdorner();              
Thread.Sleep(3000);             
Window1 w = new Window1();             
w.Show();              
LoadingAdorner.HideAdorner();         
}

If I remove the HideAdorner the Adorner displays the instant the new Window displays. How can I get the Adorner to display when the button is Clicked? Thank you for your assistance.

Answer 1

Viorel 102.4K

It is not clear what controls, adorners and functions are you using. Maybe this will work:

private async void OnCreateNewWindow( object sender, RoutedEventArgs e )
{          
   LoadingAdorner.ShowAdorner();    
   await Task.Delay( 3000 );
   Window1 w = new Window1();              
   w.Show();   
   LoadingAdorner.HideAdorner();             
}

BigH61 481 Reputation points

2023-09-15T15:34:16.3+00:00

@Viorel . Thank you for your response.

Although this does provide a solution for a basic Adorner, if the Adorner is animated the Animation stops after the Task Delay. Is there anything else I can try please not that in my more detailed project the two windows transfer data.

Answer 2

Hui Liu-MSFT 21,376 Microsoft Vendor

Hi,@BigH61.Welcome Microsoft Q&A. You could try to use a timer to control the delay and ensure that the animation continues running.

You can try to see if the following code works for you.

private async void OnCreateNewWindow(object sender, RoutedEventArgs e)
{
    LoadingAdorner.ShowAdorner();

    // Simulate some asynchronous work with a timer (remove this in your actual code)
    var timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(3) };
    timer.Tick += (s, args) =>
    {
        timer.Stop();
        Window1 w = new Window1();
        w.Show();
        LoadingAdorner.HideAdorner();
    };
    timer.Start();
}

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BigH61 481 Reputation points

2023-09-18T15:40:39.2733333+00:00

@Hui Liu-MSFT . Thank you for the response. Although the solution does work for my simple Adorner example, regrettably if the Adorner has any animation the animation stops a little before the new Window is shown.

Hui Liu-MSFT 21,376 Microsoft Vendor

Hi,@BigH61. Not sure about the details you need, you could try the method below to see if it works.

Method1: You can try the updated code of the previous solution.

private async void OnCreateNewWindow(object sender, RoutedEventArgs e)
{
    LoadingAdorner.ShowAdorner();

    // Simulate some asynchronous work with a delay on a background thread
    await Task.Run(async () =>
    {
        await Task.Delay(3000); // This delay runs on a background thread
    });

    // Once the delay is done, switch back to the UI thread to create and show the new Window
    Dispatcher.Invoke(() =>
    {
        Window1 w = new Window1();
        w.Show();
        LoadingAdorner.HideAdorner();
    });
}

Method 2: You could try to use a Storyboard or animation that runs asynchronously and triggers the action you want after the animation completes.

private async void OnCreateNewWindow(object sender, RoutedEventArgs e)
{
    LoadingAdorner.ShowAdorner();

    // Create a DoubleAnimation to animate something (replace this with your actual animation)
    DoubleAnimation animation = new DoubleAnimation();
    animation.From = 0;
    animation.To = 1;
    animation.Duration = TimeSpan.FromSeconds(3);

    // Create a Storyboard and add the animation
    Storyboard storyboard = new Storyboard();
    storyboard.Children.Add(animation);

    // Handle the Completed event of the animation
    animation.Completed += async (s, args) =>
    {
        // Delay for an additional 1 second (adjust as needed)
        await Task.Delay(1000);

        // Open a new window
        Window1 w = new Window1();
        w.Show();

        // Hide the adorner
        LoadingAdorner.HideAdorner();
    };

    // Start the animation
    storyboard.Begin();
}

Adorner Not showing

2 answers

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