Class DpiHandler

This handles DPI changes see u.a. Writing DPI-Aware Desktop and Win32 Applications

Inheritance
System.Object
DpiHandler
Namespace: Dapplo.Windows.Dpi
Assembly: Dapplo.Windows.Dpi.dll
Syntax
public sealed class DpiHandler : IDisposable

Constructors

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DpiHandler(Boolean)

Create a DpiHandler

Declaration
public DpiHandler(bool needsListenerWorkaround = false)
Parameters
Type Name Description
System.Boolean needsListenerWorkaround

Fields

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DefaultScreenDpi

This is the default DPI for the screen

Declaration
public const double DefaultScreenDpi = null
Field Value
Type Description
System.Double

Properties

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Dpi

Retrieve the current DPI for the window

Declaration
public double Dpi { get; }
Property Value
Type Description
System.Double
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IsDpiAware

Check if the process is DPI Aware, an DpiHandler doesn't make sense if not.

Declaration
public static bool IsDpiAware { get; }
Property Value
Type Description
System.Boolean
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OnDpiChanged

This subject publishes whenever the dpi settings change

Declaration
public IObservable<double> OnDpiChanged { get; }
Property Value
Type Description
IObservable<System.Double>

Methods

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Dispose()

Declaration
public void Dispose()
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EnableDpiAwareness()

Turn on the Dpi awareness

Declaration
public static bool EnableDpiAwareness()
Returns
Type Description
System.Boolean

bool if this is enabled
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GetDpi(IntPtr)

Retrieve the DPI value for the supplied window handle

Declaration
public static int GetDpi(IntPtr hWnd)
Parameters
Type Name Description
IntPtr hWnd

IntPtr
Returns
Type Description
System.Int32

dpi value
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ScaleWithDpi(Int32, Double)

Scale the supplied base width according to the supplied dpi

Declaration
public static int ScaleWithDpi(int baseWidth, double dpi)
Parameters
Type Name Description
System.Int32 baseWidth

int with e.g. 16 for 16x16 images
System.Double dpi

current dpi, normal is 96.
Returns
Type Description
System.Int32

Scaled width
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TryEnableNonClientDpiScaling(IntPtr)

public wrapper for EnableNonClientDpiScaling, this also checks if the function is available.

Declaration
public static bool TryEnableNonClientDpiScaling(IntPtr hWnd)
Parameters
Type Name Description
IntPtr hWnd

IntPtr
Returns
Type Description
System.Boolean

true if it worked