A library for Per-Monitor DPI aware and color profile aware Window
Latest commit 4abbed8 Sep 18, 2016 @emoacht committed on GitHub Merge pull request #8 from emoacht/develop
Added functions related to built-in scaling
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WPF Monitor Aware Window

A library for WPF Per-Monitor DPI aware and color profile aware window


  • .NET Framework 4.5.2
  • Windows 8.1 or newer to take advantage of Per-Monitor DPI


Type Description
MonitorAwareWindow Per-Monitor DPI aware window.
MonitorAwareBehavior Behavior to make a window Per-Monitor DPI aware. This behavior is inherited from System.Windows.Interactivity.Behavior and so requires System.Windows.Interactivity.dll.
MonitorAwareProperty Attached property to make a window Per-Monitor DPI aware.
ExtendedWindow Per-Monitor DPI aware and customizable chrome Window. This window is completely Per-Monitor DPI aware including window chrome.

Common Properties

Property Description
WindowHandler.IsPerMonitorDpiAware Whether current process is Per-Monitor DPI aware.
WindowHandler.SystemDpi System DPI. This value is used by default to render a Window and other FrameworkElements and so will be the starting point to adjust scaling of FrameworkElements that are once rendered.
WindowHandler.MonitorDpi Per-Monitor DPI of the monitor to which a Window belongs. This value will be updated when the Window receives WM_DPICHANGED message.
WindowHandler.WindowDpi Per-Monitor DPI to be used to render a Window. This value will be conformed to Per-Monitor DPI of the monitor when the Window moves to a location where the resized Window belongs to the destination monitor but not the source monitor. There will be a time lag between when WM_DPICHANGED message comes and when this value changes depending on the location of the Window.
WindowHandler.ColorProfilePath Color profile path used by the monitor to which a Window belongs.
WindowHandler.ForbearScaling Whether to forbear scaling.
WillForbearScalingIfUnnecessary Whether to forbear scaling if it is unnecessary because built-in scaling is enabled.

The default DPI of WPF rendering system is 96. To adjust scaling of FrameworkElements by code, you have to carefully select the source DPI and the destination DPI.

Common Events

Event Description
WindowHandler.DpiChanged Occurs when the WindowDpi is conformed to the MonitorDpi.
WindowHandler.ColorProfileChanged Occurs when the ColorProfilePath is changed.

DPI Awareness

This library has no function to notify OS of DPI awareness of an app. The app using this library needs to declare itself Per-Monitor DPI aware in the application manifest.

Built-in Scaling

From Windows 10 Anniversary Update (Redstone 1), built-in scaling for WPF is supported.

The prerequisites for built-in scaling are the following:

  • 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.

In addition, if Switch.System.Windows.DoNotScaleForDpiChanges is specified in the application configuration, it will have the following effects:

  • True - DISABLE built-in scaling even if the above conditions are met.
  • False - ENABLE built-in scaling even if target framework is older than 4.6.2.

See the Developer Guide in Microsoft/WPF-Samples/PerMonitorDPI/.

To use built-in scaling instead of this library's scaling in an environment where built-in scaling is enabled, set WillForbearScalingIfUnnecessary property to True.


  • MIT License