PropertyValueUIHandler Delegate

Reference

Definition

Namespace:: System.Drawing.Design

Assembly:: System.Drawing.dll

Assemblies:: System.Drawing.dll, System.Windows.Forms.dll

Assembly:: System.Windows.Forms.dll

Important

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Represents the method that adds a delegate to an implementation of IPropertyValueUIService.

public delegate void PropertyValueUIHandler(ITypeDescriptorContext ^ context, PropertyDescriptor ^ propDesc, ArrayList ^ valueUIItemList);

public delegate void PropertyValueUIHandler(ITypeDescriptorContext context, PropertyDescriptor propDesc, ArrayList valueUIItemList);

type PropertyValueUIHandler = delegate of ITypeDescriptorContext * PropertyDescriptor * ArrayList -> unit

Public Delegate Sub PropertyValueUIHandler(context As ITypeDescriptorContext, propDesc As PropertyDescriptor, valueUIItemList As ArrayList)

Parameters

context: ITypeDescriptorContext

An ITypeDescriptorContext that can be used to obtain context information.

propDesc: PropertyDescriptor

A PropertyDescriptor that represents the property being queried.

valueUIItemList: ArrayList

An ArrayList of PropertyValueUIItem objects containing the UI items associated with the property.

Examples

This following code example demonstrates creating a PropertyValueUIHandler event handler method that provides PropertyValueUIItem objects for any properties named HorizontalMargin or VerticalMargin.

// PropertyValueUIHandler delegate that provides PropertyValueUIItem
// objects to any properties named HorizontalMargin or VerticalMargin.
private void marginPropertyValueUIHandler(
    System.ComponentModel.ITypeDescriptorContext context,
    System.ComponentModel.PropertyDescriptor propDesc,
    ArrayList itemList)
{
    // 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"))
    {
        Image img = Image.FromFile("SampImag.jpg");
        itemList.Add(new PropertyValueUIItem(img, new PropertyValueUIItemInvokeHandler(this.marginInvoke), "Test ToolTip"));
    }
    if (propDesc.DisplayName.Equals("VerticalMargin"))
    {
        Image img = Image.FromFile("SampImag.jpg");
        img.RotateFlip(RotateFlipType.Rotate90FlipNone);
        itemList.Add(new PropertyValueUIItem(img, new PropertyValueUIItemInvokeHandler(this.marginInvoke), "Test ToolTip"));
    }
}

Remarks

When this delegate is invoked, it can add a PropertyValueUIItem containing UI items for the specified property to the ArrayList passed as the valueUIItemList parameter.

Extension Methods

GetMethodInfo(Delegate)

Gets an object that represents the method represented by the specified delegate.

Applies to

Delen via