Airspace Fixer

AirspaceFixerDotNet is a small lightweight project, forked from the original AirspaceFixer project and is a drop-in replacement for the original. This project only contains a single control - AirspacePanel with a few upgrades and fixes applied to the original. The memory leaks have been removed and the scaling math has been updated to support Per-Monitor DPI Scaling. The projects have updated to use SDK-style projects with .NET 4.6.2 and .NET 8.0.

If you've ever had to host any WinForms forms inside a WPF project, you might know about the dreaded Airspace problem. Basically, the WinForms control must always be on top. Even if you try to put a modal dialog on top of the WinForms control, this Airspace issue forces the WinForms control on top.

AirspacePanel aims to fix this problem by allowing you to host any content you like inside of it, and swapping out the content for a screenshot of the content when you need to place a modal dialog on top of it. This swap is done by using the dependency property FixAirspace. Here is an example:

<Window x:Class="AirspaceFixerSample.MainWindow" 
    xmlns:asf="clr-namespace:AirspaceFixer;assembly=AirspaceFixerDotNet">

<asf:AirspacePanel FixAirspace="{Binding FixAirspace}">
    <WebBrowser x:Name="Browser" />
</asf:AirspacePanel>

When used on .NET Framework platforms the following will need to add this to the application app.manifest file. This will ensure that Per-Monitor DPI scaling is applied to your application for every version of Windows back to Windows 7 and the updated scaling math can function correctly. The gdiScaling setting must be set to false or the scaling math will be incorrect.

<application xmlns="urn:schemas-microsoft-com:asm.v3">
    <windowsSettings>
        <!-- fallback for Windows 7 and 8 -->
        <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true/pm</dpiAware>
        <!-- adding v1 as fallback would result in v2 not being applied to dialogs on capable systems -->
        <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
        <!-- disables GDI DPI scaling -->
        <gdiScaling xmlns="http://schemas.microsoft.com/SMI/2017/WindowsSettings">false</gdiScaling>
    </windowsSettings>
</application>

See the sample app for more info on how to use it.

AirspaceFixer is also available in Nuget to include in your projects as a package.