Need help to make window as overlay in WinUI3 application development.

Question

Hi Team,

I have created WinUI3 project to make a overlay application show it on top of every other application.
I need below things to be implemented.

1. How to change the background color of the window.
2. How to remove the close icon in the top right corner of the winow.
3. how to remove the image and title bar from the window.
4. how to make the window transparent.

the code which i wrote is attached here.

help me to create a overlay kind of application here.

Answer 1

You can call

_presenter.SetBorderAndTitleBar(false, false);  

You can change the transparency with SetLayeredWindowAttributes

You can change the background with a Grid, a Border and Border.Background
For example, I have set a Gradient as background in the XAML :

 <Border.Background>  
                    <LinearGradientBrush StartPoint='0,0' EndPoint='1,1'>  
                        <GradientStop Color='Yellow' Offset='0.0' />  
                        <GradientStop Color='Red' Offset='0.25' />  
                        <GradientStop Color='Blue' Offset='0.75' />  
                        <GradientStop Color='LimeGreen' Offset='1.0' />  
                    </LinearGradientBrush>  
 </Border.Background>  

I get :