Imports System
Imports System.Windows.Forms
Imports System.Collections.Generic
Imports System.ComponentModel
Public Class MainClass
Shared Sub Main()
Dim the_items As New MostRecentList(Of String)(4)
the_items.Add("A")
the_items.Add("B")
the_items.Add("C")
the_items.Add("D")
the_items.Add("D")
the_items.Add("B")
the_items.Add("F")
For i As Integer = 0 To the_items.Count - 1
Console.WriteLine(the_items.Item(i))
Next i
the_items.MaxItems = 2
Console.WriteLine()
For i As Integer = 0 To the_items.Count - 1
Console.WriteLine(the_items.Item(i))
Next i
End Sub
End Class
Public Class MostRecentList(Of ItemType)
Public Sub New(ByVal max_items As Integer)
MaxItems = max_items
End Sub
Private m_Items As New List(Of ItemType)
<Description("The items."), _
Category("Data")> _
Public Property Item(ByVal index As Integer) As ItemType
Get
Return m_Items(index)
End Get
Set(ByVal value As ItemType)
m_Items(index) = value
End Set
End Property
Private m_MaxItems As Integer = 4
<Description("The maximum number of items in the list."), _
Category("Data")> _
Public Property MaxItems() As Integer
Get
Return m_MaxItems
End Get
Set(ByVal value As Integer)
m_MaxItems = value
Do While m_Items.Count > m_MaxItems
m_Items.RemoveAt(m_Items.Count - 1)
Loop
End Set
End Property
<Description("The current number of items."), _
Category("Data")> _
Public ReadOnly Property Count() As Integer
Get
Return m_Items.Count
End Get
End Property
Public Sub Add(ByVal value As ItemType)
If m_Items.Contains(value) Then m_Items.Remove(value)
m_Items.Insert(0, value)
If m_Items.Count > m_MaxItems Then m_Items.RemoveAt(m_Items.Count - 1)
End Sub
Public Sub Remove(ByVal value As ItemType)
m_Items.Remove(value)
End Sub
Public Sub RemoveAt(ByVal index As Integer)
m_Items.RemoveAt(index)
End Sub
End Class
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