form1.frm

Visual Basic 6 大学教程的代码

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Demonstrating class CList"
   ClientHeight    =   2985
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   3495
   LinkTopic       =   "Form1"
   ScaleHeight     =   2985
   ScaleWidth      =   3495
   StartUpPosition =   3  'Windows Default
   Begin VB.ListBox lstOutput 
      Height          =   1425
      ItemData        =   "Form1.frx":0000
      Left            =   0
      List            =   "Form1.frx":0002
      TabIndex        =   6
      Top             =   1560
      Width           =   3495
   End
   Begin VB.CommandButton cmdRemoveBack 
      Caption         =   "Remove from back"
      Height          =   375
      Left            =   1800
      TabIndex        =   5
      Top             =   1080
      Width           =   1695
   End
   Begin VB.CommandButton cmdRemoveFront 
      Caption         =   "Remove from front"
      Height          =   375
      Left            =   0
      TabIndex        =   4
      Top             =   1080
      Width           =   1695
   End
   Begin VB.CommandButton cmdInsertFront 
      Caption         =   "Insert at front"
      Height          =   375
      Left            =   0
      TabIndex        =   3
      Top             =   600
      Width           =   1695
   End
   Begin VB.CommandButton cmdInsertBack 
      Caption         =   "Insert at back"
      Height          =   375
      Left            =   1800
      TabIndex        =   2
      Top             =   600
      Width           =   1695
   End
   Begin VB.TextBox txtInput 
      Height          =   285
      Left            =   0
      TabIndex        =   0
      Top             =   240
      Width           =   3495
   End
   Begin VB.Label lblInput 
      Caption         =   "Enter value to insert"
      Height          =   255
      Left            =   0
      TabIndex        =   1
      Top             =   0
      Width           =   2655
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
' Fig. 21.3
' Demonstrating class CList
Option Explicit
Dim list As New CList

Private Sub cmdInsertFront_Click()
   Call list.InsertAtFront(txtInput.Text)
   Call Display
End Sub

Private Sub cmdInsertBack_Click()
   Call list.InsertAtBack(txtInput.Text)
   Call Display
End Sub

Private Sub cmdRemoveFront_Click()
   txtInput.Text = ""
   Call list.RemoveFromFront
   Call Display
End Sub

Private Sub cmdRemoveBack_Click()
   txtInput.Text = ""
   Call list.RemoveFromBack
   Call Display
End Sub

Private Sub Display()
   Dim elements As New CListIterator
   
   Call lstOutput.Clear
   Set elements = list.Iterator
   
   If elements.HasMoreItems = False Then
      Call lstOutput.AddItem("The list is empty")
      Exit Sub
   End If
   
   While elements.HasMoreItems
      Call lstOutput.AddItem(elements.NextItem)
   Wend
End Sub