form1.frm

Visual Basic 6 大学教程的代码

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Demonstrating class CQueue"
   ClientHeight    =   3120
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   3975
   LinkTopic       =   "Form1"
   ScaleHeight     =   3120
   ScaleWidth      =   3975
   StartUpPosition =   3  'Windows Default
   Begin VB.TextBox txtPush 
      Height          =   285
      Left            =   1440
      TabIndex        =   3
      Top             =   105
      Width           =   975
   End
   Begin VB.CommandButton cmdEnqueue 
      Caption         =   "Value to enqueue"
      Height          =   285
      Left            =   2520
      TabIndex        =   2
      Top             =   105
      Width           =   1455
   End
   Begin VB.CommandButton cmdDequeue 
      Caption         =   "Dequeue value"
      Height          =   285
      Left            =   0
      TabIndex        =   1
      Top             =   840
      Width           =   1695
   End
   Begin VB.ListBox lstOutput 
      Height          =   1815
      ItemData        =   "Form1.frx":0000
      Left            =   0
      List            =   "Form1.frx":0002
      TabIndex        =   0
      Top             =   1320
      Width           =   3975
   End
   Begin VB.Line Line1 
      X1              =   0
      X2              =   3960
      Y1              =   600
      Y2              =   600
   End
   Begin VB.Label lblEnqueue 
      Alignment       =   1  'Right Justify
      Caption         =   "Value to enqueue:"
      Height          =   255
      Left            =   0
      TabIndex        =   5
      Top             =   120
      Width           =   1335
   End
   Begin VB.Label lblDequeue 
      Height          =   255
      Left            =   1800
      TabIndex        =   4
      Top             =   855
      Width           =   2055
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
' Fig. 21.11
' Demonstrating class CQueue
Option Explicit
Dim mQueue As New CQueue

Private Sub cmdEnqueue_Click()
   mQueue.Enqueue (txtPush.Text)
   Call Display
End Sub

Private Sub cmdDequeue_Click()
   lblDequeue.Caption = "Dequeued: " & mQueue.Dequeue()
   Call Display
End Sub

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