ShapeCollection Class

Article
07/10/2012

Represents a collection of Shape objects.

Inheritance Hierarchy

Object
Microsoft.VisualBasic.PowerPacks.ShapeCollection

Namespace: Microsoft.VisualBasic.PowerPacks
Assembly: Microsoft.VisualBasic.PowerPacks.Vs (in Microsoft.VisualBasic.PowerPacks.Vs.dll)

Syntax

'Declaration
Public NotInheritable Class ShapeCollection _
    Implements IList, IDisposable

public sealed class ShapeCollection : IList, 
    IDisposable

public ref class ShapeCollection sealed : IList, 
    IDisposable

[<Sealed>]
type ShapeCollection =  
    class 
        interface IList 
        interface IDisposable 
    end

public final class ShapeCollection implements IList, IDisposable

The ShapeCollection type exposes the following members.

Constructors

	Name	Description
	ShapeCollection	Initializes a new instance of the ShapeCollection class.

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Properties

	Name	Description
	Count	Gets the number of shapes in the collection.
	IsReadOnly	Gets a value indicating whether a collection is read-only.
	Item	Gets the Shape at the specified indexed location in the collection.
	Owner	Gets the ShapeContainer that owns the ShapeCollection.

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Methods

	Name	Description
	Add	Adds the specified Shape to the ShapeCollection.
	AddRange	Adds an array of Shape objects to the ShapeCollection.
	Clear	Removes all shapes from the collection.
	Contains	Determines whether the specified Shape is a member of the collection.
	ContainsKey	Determines whether the ShapeCollection contains an item with the specified key.
	CopyTo	Copies the whole ShapeCollection to a compatible one-dimensional Array, starting at the specified index of the destination array.
	Dispose	Releases the unmanaged resources used by the ShapeCollection.
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetChildIndex(Shape)	Retrieves the index of the specified Shape in the ShapeCollection.
	GetChildIndex(Shape, Boolean)	Retrieves the index of the specified Shape in the ShapeCollection, and optionally raises an exception if the specified Shape is not in the ShapeCollection.
	GetEnumerator	Retrieves a reference to an enumerator object that is used to iterate over a ShapeCollection.
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IndexOf	Retrieves the index of the specified Shape in the ShapeCollection.
	IndexOfKey	Retrieves the index of the first occurrence of the specified item in the collection.
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	Remove	Removes the specified Shape from the ShapeCollection.
	RemoveAt	Removes a Shape from the ShapeCollection at the specified indexed location.
	SetChildIndex	Sets the index of the specified Shape in the ShapeCollection to the specified index value.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Explicit Interface Implementations

	Name	Description
	IListAdd
	IListContains
	ICollectionCopyTo
	IListIndexOf
	IListInsert
	IListIsFixedSize
	ICollectionIsSynchronized
	IListRemove
	ICollectionSyncRoot

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Remarks

The Add, Remove, and RemoveAt methods enable you to add and remove individual shapes from the collection. You can also use the AddRange or Clear method to add or remove all the shapes from the collection.

You can determine whether a Shape is a member of the collection by passing the shape into the Contains method. To get the index value of the location of a shape in the collection, pass the shape into the IndexOf method. You can copy the collection into an array by calling the CopyTo method.

Examples

The following code example removes a Shape from the ShapeCollection of a form if it is a member of the collection. The example requires that you have a LineShape, an OvalShape, and a RectangleShape control on a form. When a shape is clicked, it is removed from the ShapeCollection unless it is the last shape in the collection.

Private Sub Shapes_Click(
    ByVal sender As System.Object, 
    ByVal e As System.EventArgs
  ) Handles RectangleShape1.Click, 
            OvalShape1.Click, LineShape1.Click

    ' Determine whether the shape is in the collection. 
    If ShapeContainer1.Shapes.Contains(sender) Then 
        ' If the Index is greater than 0, remove the shape. 
        If ShapeContainer1.Shapes.IndexOf(sender) > 0 Then
            ShapeContainer1.Shapes.Remove(sender)
        End If 
    End If 
End Sub

private void Shapes_Click(System.Object sender, System.EventArgs e)
{
    // Determine whether the shape is in the collection. 
    if (shapeContainer1.Shapes.Contains((Shape)sender))
    // If the Index is greater than 0, remove the shape.
    {
        if (shapeContainer1.Shapes.IndexOf((Shape)sender) > 0)
        {
            shapeContainer1.Shapes.Remove((Shape)sender);
        }
    }
}

Thread Safety

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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