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PreProcessInputEventArgs Class

Provides data for preprocess input events.

Namespace:  System.Windows.Input
Assembly:  PresentationCore (in PresentationCore.dll)

public sealed class PreProcessInputEventArgs : ProcessInputEventArgs

The PreProcessInputEventArgs type exposes the following members.

  NameDescription
Public propertyCanceledDetermines whether processing of the input event was canceled.
Public propertyInputManagerGets the input manager processing the input event. (Inherited from NotifyInputEventArgs.)
Public propertyStagingItemGets the staging area input item being processed by the input manager. (Inherited from NotifyInputEventArgs.)
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  NameDescription
Public methodCancelCancels the processing of the input event.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodPeekInputGets, but does not pop, the input event on the top of the staging area stack. (Inherited from ProcessInputEventArgs.)
Public methodPopInputRemoves the input event off the top of the staging area stack. (Inherited from ProcessInputEventArgs.)
Public methodPushInput(StagingAreaInputItem)Puts the specified input event onto the top of the staging area stack. (Inherited from ProcessInputEventArgs.)
Public methodPushInput(InputEventArgs, StagingAreaInputItem)Puts the specified input event onto the top of the specified staging area stack. (Inherited from ProcessInputEventArgs.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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Canceling a pre-process input stops the input from being processed further. Listen for the PreNotifyInput to determine if another handler canceled a pre-process input.

The input staging area processes input into WPF events.

All PreProcessInput event handlers are called, even if one of the handlers cancels the input. To verify if a handler further up the tree canceled the input, listen for the PreNotifyInput event.

PreProcessInputEventArgs is used with the PreProcessInput event.

Input is processed in WPF in the follow stages:

  1. Pre-process stage. The input manager raises the PreProcessInput event.

  2. Pre-notify stage. The input manager raises the PreNotifyInput event.

  3. The WPF input event or events are raised.

  4. Post-notify stage. The input manager raises the PostNotifyInput event.

  5. Post-process stage. The input manager raises the PostProcessInput event.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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