Why does the this popup think it is encountering the edge of the screen?

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Why does the this popup think it is encountering the edge of the screen?



The Popup Placement Behavior Guide shows how to position a popup using several properties:



Using these, we can set the target area, target origin, and placement alignment point. The guide goes on to describe a whole host of conditions for how the popup is placed in the event that it encounters the screen.



In my application, I created a popup programmatically as a response to user input and set the properties:


private void Button_Click(object sender, RoutedEventArgs e)

Popup popup = new Popup();
popup.Child = new PopupContent();
popup.Placement = PlacementMode.Right;
popup.PlacementTarget = redRectangle;

popup.StaysOpen = false;
popup.IsOpen = true;



The intended behavior was that the popup would appear on the right of rectangle. Instead I got this:



Incorrect Popup Placement




<Window x:Class="PopupTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Width="700" Height="700">
<Grid>
<Button Click="Button_Click" Content="Create Popup" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="83" Height="25"/>
<Rectangle x:Name="redRectangle" Width="20" Height="20" Fill="Red"/>
</Grid>
</Window>




<UserControl x:Class="PopupTest.PopupContent"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Width="300" Height="300">
<Border BorderBrush="Black" BorderThickness="2">
<Border BorderBrush="#FF50A0E0" BorderThickness="10" Background="White">
<Border BorderBrush="Black" BorderThickness="2" Padding="10">
<Label Content="Popup!" FontSize="70" VerticalContentAlignment="Center" HorizontalContentAlignment="Center"/>
</Border>
</Border>
</Border>
</UserControl>





There's not enough room on the right side of that rectangle for the entire dialog to fit on the screen, unless you haven't shown us the whole screen.
– Robert Harvey♦
Aug 10 at 20:24






You'd think that might be the case; however if you resize the window it still is placed to the left.
– Nick Miller
Aug 10 at 20:26





I can't reproduce your issue. Which version on the .NET Framework and Windows are you on
– mm8
Aug 13 at 12:35





Hi @mm8, I'm using .NET 4.6.1. One thing I did notice was that there needs to be enough room to display the popup on the left, otherwise the popup is coerced to the right.
– Nick Miller
Aug 13 at 12:57





I have .NET 4.7.1 installed and running your code the Popup is always displayed to the right of the rectangle as expected.
– mm8
Aug 13 at 12:59










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