Imports System.Net
Public Class Form4
    Dim WithEvents WC As New WebClient
    Dim appPath As String = Application.StartupPath()


    Private IsFormBeingDragged As Boolean = False

    Private MouseDownX As Integer

    Private MouseDownY As Integer

    Dim z As String

    Private Sub Form4_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        For counter = 10 To 90 Step +20

            Me.Opacity = counter / 100

            Me.Refresh()

            Threading.Thread.Sleep(50)
        Next


        Me.Opacity = 100
        Try
            Label1.Text = "便攜版 Java下載進行中…"
            WC.DownloadFileAsync(New Uri("http://hkwtc.no-ip.org:8080/hkwtcbs/DreamMelody/Download/java.exe"), appPath & "\system\java.exe")


        Catch ex As Exception
            Label1.Text = ex.Message
        End Try

    End Sub

    Private Sub WC_DownloadProgressChanged(ByVal sender As Object, ByVal e As DownloadProgressChangedEventArgs) Handles WC.DownloadProgressChanged
        ProgressBar1.Value = e.ProgressPercentage
        If ProgressBar1.Value = 100 Then
            Label1.Text = "Java 下載完成"
            Threading.Thread.Sleep(1000)

            If My.Computer.FileSystem.FileExists(appPath & "\system\java.exe") Then
                Try
                    Shell(appPath & "\system\java.exe")
                Catch ex As Exception

                End Try

            End If
            Dim iCount As Integer

            For iCount = 90 To 10 Step -10
                Me.Opacity = iCount / 100
                Threading.Thread.Sleep(50)
            Next
            Me.Hide()
        End If
    End Sub

    Private Sub Form4_MouseDown(ByVal sender As Object, ByVal e As MouseEventArgs) Handles MyBase.MouseDown



        If e.Button = MouseButtons.Left Then

            IsFormBeingDragged = True

            MouseDownX = e.X

            MouseDownY = e.Y

        End If

    End Sub



    Private Sub Form4_MouseUp(ByVal sender As Object, ByVal e As MouseEventArgs) Handles MyBase.MouseUp



        If e.Button = MouseButtons.Left Then

            IsFormBeingDragged = False

        End If

    End Sub



    Private Sub Form4_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs) Handles MyBase.MouseMove



        If IsFormBeingDragged Then

            Dim temp As Point = New Point()



            temp.X = Me.Location.X + (e.X - MouseDownX)

            temp.Y = Me.Location.Y + (e.Y - MouseDownY)
            Me.Location = temp

            temp = Nothing

        End If

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
        If My.Computer.FileSystem.FileExists(appPath & "\system\java.exe") Then
            Shell(appPath & "\system\java.exe")
        End If
    End Sub
End Class