thumbnailsform.vb

Mastering VBNet Include Source Code

Imports System.IO
Public Class ThumbnailsForm
    Inherits System.Windows.Forms.Form

#Region " Windows Form Designer generated code "

    Public Sub New()
        MyBase.New()

        'This call is required by the Windows Form Designer.
        InitializeComponent()

        'Add any initialization after the InitializeComponent() call

    End Sub

    'Form overrides dispose to clean up the component list.
    Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
        If disposing Then
            If Not (components Is Nothing) Then
                components.Dispose()
            End If
        End If
        MyBase.Dispose(disposing)
    End Sub
    Friend WithEvents DrivesList As System.Windows.Forms.ComboBox
    Friend WithEvents FoldersList As System.Windows.Forms.ListBox

    'Required by the Windows Form Designer
    Private components As System.ComponentModel.Container

    'NOTE: The following procedure is required by the Windows Form Designer
    'It can be modified using the Windows Form Designer.  
    'Do not modify it using the code editor.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.FoldersList = New System.Windows.Forms.ListBox()
        Me.DrivesList = New System.Windows.Forms.ComboBox()
        Me.SuspendLayout()
        '
        'FoldersList
        '
        Me.FoldersList.Font = New System.Drawing.Font("Verdana", 9!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.FoldersList.ItemHeight = 14
        Me.FoldersList.Location = New System.Drawing.Point(8, 36)
        Me.FoldersList.Name = "FoldersList"
        Me.FoldersList.Size = New System.Drawing.Size(216, 214)
        Me.FoldersList.TabIndex = 1
        '
        'DrivesList
        '
        Me.DrivesList.DropDownWidth = 232
        Me.DrivesList.Font = New System.Drawing.Font("Verdana", 9!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.DrivesList.Location = New System.Drawing.Point(8, 8)
        Me.DrivesList.Name = "DrivesList"
        Me.DrivesList.Size = New System.Drawing.Size(112, 22)
        Me.DrivesList.TabIndex = 0
        Me.DrivesList.Text = "ComboBox1"
        '
        'ThumbnailsForm
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.AutoScroll = True
        Me.ClientSize = New System.Drawing.Size(616, 253)
        Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.FoldersList, Me.DrivesList})
        Me.Name = "ThumbnailsForm"
        Me.Text = "ThumbNails Demo"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Form1_Load(ByVal sender As System.Object, _
                           ByVal e As System.EventArgs) _
                        Handles MyBase.Load
        ShowAllDrives()
        DrivesList.SelectedIndex = 1
        Me.Text = Directory.GetCurrentDirectory
    End Sub

    Sub ShowAllDrives()
        Dim drives() As String
        drives = Directory.GetLogicalDrives()
        Dim aDrive As String
        DrivesList.Items.Clear()
        For Each aDrive In drives
            DrivesList.Items.Add(aDrive)
        Next
    End Sub

    Sub ShowFoldersInDrive(ByVal drive As String)
        Dim folders() As String
        Try
            folders = Directory.GetDirectories(drive)
        Catch exception As Exception
            MsgBox(exception.Message)
            Exit Sub
        End Try

        Dim fldr As String
        FoldersList.Items.Clear()
        Dim DI As DirectoryInfo
        For Each fldr In folders
            DI = New DirectoryInfo(fldr)
            FoldersList.Items.Add(DI.Name)
        Next
        Directory.SetCurrentDirectory(drive)
        Me.Text = Directory.GetCurrentDirectory
    End Sub

    Sub ShowFilesInFolder()
        Dim file As String
        Dim FI As FileInfo
        Dim PBox As PictureBox, img As Image
        Dim Left As Integer = 280
        Dim Top As Integer = 40
        Dim ctrl As Integer
        For ctrl = Me.Controls.Count - 1 To 2 Step -1
            Me.Controls.Remove(Me.Controls(ctrl))
        Next
        Me.Invalidate()
        For Each file In Directory.GetFiles(Directory.GetCurrentDirectory)
            FI = New FileInfo(file)
            If FI.Extension = ".GIF" Or FI.Extension = ".JPG" Then
                PBox = New PictureBox()
                img = Image.FromFile(FI.FullName)
                PBox.Image = _
                        img.GetThumbnailImage(64, 64, Nothing, Nothing)
                If Left > 580 Then
                    Left = 280
                    Top = Top + 74
                End If
                PBox.Left = Left
                PBox.Top = Top
                PBox.Width = 64
                PBox.Height = 64
                PBox.Visible = True
                PBox.Tag = FI.FullName
                Me.Controls.Add(PBox)
                AddHandler PBox.Click, _
                           New System.EventHandler(AddressOf OpenImage)
                Left = Left + 74
            End If
        Next
    End Sub
    Sub OpenImage(ByVal sender As Object, ByVal e As System.EventArgs)
        MsgBox("will open " & sender.tag)
        Dim imgForm As New previewForm()
        imgForm.PictureBox1.Image = Image.FromFile(sender.tag)
        imgForm.Show()
    End Sub
    Private Sub DrivesList_SelectedIndexChanged(ByVal sender As System.Object, _
                                                ByVal e As System.EventArgs) _
                                                Handles DrivesList.SelectedIndexChanged
        ShowFoldersInDrive(DrivesList.Text)
        'dir = DrivesList.Text
    End Sub

    Private Sub FoldersList_SelectedIndexChanged(ByVal sender As System.Object, _
                                                 ByVal e As System.EventArgs) _
                                                 Handles FoldersList.SelectedIndexChanged

        Dim DI As DirectoryInfo
        Select Case FoldersList.Text
            Case ""
                MsgBox("Please select a folder to expand")
                Exit Sub
            Case ".."
                Directory.SetCurrentDirectory("..")
            Case Else
                Directory.SetCurrentDirectory(Directory.GetCurrentDirectory & _
                             "\" & FoldersList.Text)
                Me.Text = Directory.GetCurrentDirectory
        End Select
        Dim folders() As String
        Dim selectedFolder As String = FoldersList.Text
        folders = Directory.GetDirectories(Directory.GetCurrentDirectory)
        FoldersList.Items.Clear()
        If Directory.GetCurrentDirectory <> _
                             Directory.GetDirectoryRoot(selectedFolder) Then _
            FoldersList.Items.Add("..")
        Dim fldr As String
        For Each fldr In folders
            DI = New DirectoryInfo(fldr)
            FoldersList.Items.Add(DI.Name)
        Next
        ShowFilesInFolder()
    End Sub


End Class