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PropertyValueUIItemInvokeHandler Delegate

Represents the method that will handle the InvokeHandler event of a PropertyValueUIItem.

Namespace:  System.Drawing.Design
Assembly:  System.Drawing (in System.Drawing.dll)

'Declaration
Public Delegate Sub PropertyValueUIItemInvokeHandler ( _
	context As ITypeDescriptorContext, _
	descriptor As PropertyDescriptor, _
	invokedItem As PropertyValueUIItem _
)
'Usage
Dim instance As New PropertyValueUIItemInvokeHandler(AddressOf HandlerMethod)

Parameters

context
Type: System.ComponentModel.ITypeDescriptorContext

The ITypeDescriptorContext for the property associated with the icon that was double-clicked.

descriptor
Type: System.ComponentModel.PropertyDescriptor

The property associated with the icon that was double-clicked.

invokedItem
Type: System.Drawing.Design.PropertyValueUIItem

The PropertyValueUIItem associated with the icon that was double-clicked.

Double-clicking an icon in the Properties window will raise the InvokeHandler event of the PropertyValueUIItem that the icon is associated with. The InvokeHandler event typically launches a user interface (UI) to edit the property's value. Add a PropertyValueUIItemInvokeHandler to the InvokeHandler property of a PropertyValueUIItem to assign an event handler to perform the appropriate behavior when the icon displayed next to the property name is double-clicked.

When you create a PropertyValueUIItemInvokeHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event-handler delegates, see Events and Delegates.

The following code example provides a PropertyValueUIItem object for any properties of the component named HorizontalMargin or VerticalMargin. The PropertyValueUIItem for these properties provides an image, a ToolTip, and an event handler that displays a message box when the image for the property is clicked. This code example is part of a larger example provided for the IPropertyValueUIService interface.

' PropertyValueUIHandler delegate that provides PropertyValueUIItem 
' objects to any properties named HorizontalMargin or VerticalMargin. 
Private Sub marginPropertyValueUIHandler(ByVal context As System.ComponentModel.ITypeDescriptorContext, ByVal propDesc As System.ComponentModel.PropertyDescriptor, ByVal itemList As ArrayList)
    ' A PropertyValueUIHandler added to the IPropertyValueUIService 
    ' is queried once for each property of a component and passed 
    ' a PropertyDescriptor that represents the characteristics of  
    ' the property when the Properties window is set to a new  
    ' component. A PropertyValueUIHandler can determine whether  
    ' to add a PropertyValueUIItem for the object to its ValueUIItem  
    ' list depending on the values of the PropertyDescriptor. 
    If propDesc.DisplayName.Equals("HorizontalMargin") Then 
        Dim img As Image = DeserializeFromBase64Text(imageBlob1)
        itemList.Add(New PropertyValueUIItem(img, New PropertyValueUIItemInvokeHandler(AddressOf Me.marginInvoke), "Test ToolTip"))
    End If 
    If propDesc.DisplayName.Equals("VerticalMargin") Then 
        Dim img As Image = DeserializeFromBase64Text(imageBlob1)
        img.RotateFlip(RotateFlipType.Rotate90FlipNone)
        itemList.Add(New PropertyValueUIItem(img, New PropertyValueUIItemInvokeHandler(AddressOf Me.marginInvoke), "Test ToolTip"))
    End If 
End Sub

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

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