XRValueChangedEventArgs<_ValueType> (Compact 2013)

Статья
04/19/2017

3/28/2014

This structure contains event data for the ValueChanged event, which occurs when a value changes.

Syntax

template <typename _ValueType>
struct XRValueChangedEventArgs : XRRoutedEventArgs{
  _ValueType OldValue;
  _ValueType NewValue;
};

Inheritance Hierarchy

XREventArgs

XRRoutedEventArgs

XRValueChangedEventArgs

Members

OldValue
Indicates the previous value.

NewValue
Indicates the new value.

pSource
Points to an IXRDependencyObject object that represents the source. This is the first object that raised the routed event. Inherited from XRRoutedEventArgs.

Size
Indicates the size, in bytes, of this structure. Inherited from XREventArgs.

Remarks

This template provides a generic event-data structure. You can customize this structure for a certain value type by specifying a type for the generic _ValueType parameter.

The following code shows the syntax for using this structure:

XRValueChangedEventArgs<_ValueType>

The following example shows how this template is used by the AddValueChangedEventHandler method, which attaches a delegate that handles a float value:

virtual HRESULT STDMETHODCALLTYPE AddValueChangedEventHandler(
         __in IXRDelegate<XRValueChangedEventArgs<float> >* pDelegate
        ) = 0;

.NET Framework Equivalent

None.

Requirements

Header	XamlRuntime.h
sysgen	SYSGEN_XAML_RUNTIME

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