Imports System.Runtime.InteropServices

Public Class Sidebar2
    <DllImport("SHELL32", CallingConvention:=CallingConvention.StdCall)>
    Private Shared Function SHAppBarMessage(ByVal dwMessage As Integer, ByRef BarrData As AppDeskBar) As Integer
    End Function
    <DllImport("User32.dll", CharSet:=CharSet.Auto)>
    Public Shared Function RegisterWindowMessage(ByVal msg As String) As Integer
    End Function


    Structure RECT
        Public left As Integer
        Public top As Integer
        Public right As Integer
        Public bottom As Integer
    End Structure

    Structure AppDeskBar
        Public cbSize As Integer
        Public hWnd As IntPtr
        Public uCallbackMessage As Integer
        Public uEdge As Integer
        Public rc As RECT
        Public lParam As IntPtr
    End Structure

    Public Enum ABMsg
        ABM_NEW = 0
        ABM_REMOVE = 1
        ABM_QUERYPOS = 2
        ABM_SETPOS = 3
        ABM_GETSTATE = 4
        ABM_GETTASKBARPOS = 5
        ABM_ACTIVATE = 6
        ABM_GETAUTOHIDEBAR = 7
        ABM_SETAUTOHIDEBAR = 8
        ABM_WINDOWPOSCHANGED = 9
        ABM_SETSTATE = 10
    End Enum
    Public Enum ABEdge
        ABE_LEFT = 0
        ABE_TOP = 1
        ABE_RIGHT = 2
        ABE_BOTTOM = 3
    End Enum
    Public Enum ABNotify
        ABN_STATECHANGE = 0
        ABN_POSCHANGED = 1
        ABN_FULLSCREENAPP = 2
        ABN_WINDOWARRANGE = 3
    End Enum

    Private AppDeskData As AppDeskBar
    Private fBarRegistered As Boolean = False
    Private Form As Form

    Public ReadOnly Property SidebarRegistered As Boolean
        Get
            Return fBarRegistered
        End Get
    End Property

    Public Property uCallBack As Integer

    Public Sub New(pForm As Form)
        Form = pForm
    End Sub

    Public Sub RegisterBar(dockEdge As ABEdge)
        AppDeskData = New AppDeskBar()
        AppDeskData.cbSize = Marshal.SizeOf(AppDeskData)
        AppDeskData.hWnd = Form.Handle
        If Not fBarRegistered Then
            fBarRegistered = True

            Form.FormBorderStyle = FormBorderStyle.None
            Form.ShowInTaskbar = False

            uCallBack = RegisterWindowMessage("AppBarMessage")
            AppDeskData.uCallbackMessage = uCallBack

            'ToDo: Unsigned Integers not supported
            SHAppBarMessage(CInt(ABMsg.ABM_NEW), AppDeskData)

            ABSetPos(dockEdge)
        Else
            SHAppBarMessage(CInt(ABMsg.ABM_REMOVE), AppDeskData)
            fBarRegistered = False
        End If
    End Sub

    Public Sub UnregisterSidebar()
        If fBarRegistered = True Then
            fBarRegistered = False

            Form.FormBorderStyle = FormBorderStyle.Sizable
            Form.ShowInTaskbar = True

            '----NEW
            Dim abd As New AppDeskBar()
            abd.cbSize = Marshal.SizeOf(abd)
            abd.hWnd = Form.Handle

            ' TODO: Save and restore width and taskbar
            'Me.Width = 305
            'Me.Height = 85
            'Me.ShowInTaskbar = True
            SHAppBarMessage(ABMsg.ABM_REMOVE, abd)
        End If
    End Sub

    Public Sub ABSetPos(dockEdge As ABEdge)
        Dim abd As New AppDeskBar()
        abd.cbSize = Marshal.SizeOf(abd)
        abd.hWnd = Form.Handle
        abd.uEdge = CInt(dockEdge)

        If abd.uEdge = CInt(ABEdge.ABE_LEFT) Or abd.uEdge = CInt(ABEdge.ABE_RIGHT) Then
            abd.rc.top = 0
            abd.rc.bottom = SystemInformation.PrimaryMonitorSize.Height
            If abd.uEdge = CInt(ABEdge.ABE_LEFT) Then
                abd.rc.left = 0
                abd.rc.right = Form.Size.Width
            Else
                abd.rc.right = SystemInformation.PrimaryMonitorSize.Width
                abd.rc.left = abd.rc.right - Form.Size.Width
            End If
        Else
            abd.rc.left = 0
            abd.rc.right = SystemInformation.PrimaryMonitorSize.Width
            If abd.uEdge = CInt(ABEdge.ABE_TOP) Then
                abd.rc.top = 0
                abd.rc.bottom = Form.Size.Height
            Else
                abd.rc.bottom = SystemInformation.PrimaryMonitorSize.Height
                abd.rc.top = abd.rc.bottom - Form.Size.Height
            End If
        End If

        ' Query the system for an approved size and position.
        SHAppBarMessage(CInt(ABMsg.ABM_QUERYPOS), abd)

        ' Adjust the rectangle, depending on the edge to which the
        ' appbar is anchored.
        Select Case abd.uEdge
            Case CInt(ABEdge.ABE_LEFT)
                abd.rc.right = abd.rc.left + Form.Size.Width
            Case CInt(ABEdge.ABE_RIGHT)
                abd.rc.left = abd.rc.right - Form.Size.Width
            Case CInt(ABEdge.ABE_TOP)
                abd.rc.bottom = abd.rc.top + Form.Size.Height
            Case CInt(ABEdge.ABE_BOTTOM)
                abd.rc.top = abd.rc.bottom - Form.Size.Height
        End Select

        ' Pass the final bounding rectangle to the system.
        SHAppBarMessage(CInt(ABMsg.ABM_SETPOS), abd)

        ' Move and size the appbar so that it conforms to the
        ' bounding rectangle passed to the system.
        Form.Location = New Point(abd.rc.left, abd.rc.top)
        Dim PSBH = System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height
        Dim TaskBarHeight = PSBH - System.Windows.Forms.Screen.PrimaryScreen.WorkingArea.Height
        Form.Height = Screen.PrimaryScreen.Bounds.Height - TaskBarHeight

        '  MoveWindow(abd.hWnd, abd.rc.left, abd.rc.top, abd.rc.right - abd.rc.left, abd.rc.bottom - abd.rc.top, True)
    End Sub

End Class