emoacht / wpfmonitoraware Goto Github PK

My app's main window has WindowState="Maximized" property set. When I grab it by the window title and start dragging for the first time, MonitorAware does not properly resize it. Here is the log from the debug output:

ENTERSIZEMOVE
SIZE
MOVE
MOVE
MOVE
MOVE
DPICHANGED: 96 -> 144
Monitor DPI: 96-96 -> 144-144
MOVE
MOVE
MOVE
MOVE
Window DPI: 96-96 -> 144-144
Old Size: 800-600
SIZE
SIZE
New Size: 2904-1211

What happens here (I think) is window gets un-maximised when I start dragging it (the first SIZE in the log) to 800-600 (I can confirm that this is the correct restored window size). Then, when I drag it into the monitor with a 1.5 DPI it incorrectly uses the maximised window's size rather then restored size: 800-600 * 1.5 should have been 1200-900, not the huge 2904-1211.

If I restore the window once before dragging it - the bug goes away.

Built-in scaling for WPF is supported when the following conditions are met:

• OS is Windows 10 Anniversary Update (Redstone 1) or newer.
• Target framework of assembly is .NET Framework 4.6.2 or newer.
• dpiAwareness in the application manifest is set to PerMonitor.

See the following:

• Announcing .NET Framework 4.6.2
• Microsoft/WPF-Samples/PerMonitorDPI/

In such case, this library should forbear its own scaling.

Please publish this library to NuGet 🙂