' Copyright 2010 ESRI
' 
' All rights reserved under the copyright laws of the United States
' and applicable international laws, treaties, and conventions.
' 
' You may freely redistribute and use this sample code, with or
' without modification, provided you include the original copyright
' notice and use restrictions.
' 
' See the use restrictions.
' 

Imports ESRI.ArcGIS.Carto
Imports ESRI.ArcGIS.Controls
Imports ESRI.ArcGIS.ADF.BaseClasses
Imports ESRI.ArcGIS.ADF.CATIDs
Imports System.Runtime.InteropServices

<ComClass(GoBackToPreviousExtent.ClassId, GoBackToPreviousExtent.InterfaceId, GoBackToPreviousExtent.EventsId)> _
Public NotInheritable Class GoBackToPreviousExtent
    Inherits BaseCommand

#Region "COM GUIDs"
    ' These  GUIDs provide the COM identity for this class 
    ' and its COM interfaces. If you change them, existing 
    ' clients will no longer be able to access the class.
    Public Const ClassId As String = "26D27BF0-934C-49CF-8083-96AEC30AC114"
    Public Const InterfaceId As String = "DE5352BB-55B5-4028-9745-6018697A53A9"
    Public Const EventsId As String = "6B6DDA8C-D0D5-421F-BE06-F92C3A5138CB"
#End Region
#Region "COM Registration Function(s)"
    <ComRegisterFunction(), ComVisibleAttribute(False)> _
    Public Shared Sub RegisterFunction(ByVal registerType As Type)
        ' Required for ArcGIS Component Category Registrar support
        ArcGISCategoryRegistration(registerType)

        'Add any COM registration code after the ArcGISCategoryRegistration() call

    End Sub

    <ComUnregisterFunction(), ComVisibleAttribute(False)> _
    Public Shared Sub UnregisterFunction(ByVal registerType As Type)
        ' Required for ArcGIS Component Category Registrar support
        ArcGISCategoryUnregistration(registerType)

        'Add any COM unregistration code after the ArcGISCategoryUnregistration() call

    End Sub

#Region "ArcGIS Component Category Registrar generated code"
    ''' <summary>
    ''' Required method for ArcGIS Component Category registration -
    ''' Do not modify the contents of this method with the code editor.
    ''' </summary>
    Private Shared Sub ArcGISCategoryRegistration(ByVal registerType As Type)
        Dim regKey As String = String.Format("HKEY_CLASSES_ROOT\CLSID\{{{0}}}", registerType.GUID)
        ControlsCommands.Register(regKey)

    End Sub
    ''' <summary>
    ''' Required method for ArcGIS Component Category unregistration -
    ''' Do not modify the contents of this method with the code editor.
    ''' </summary>
    Private Shared Sub ArcGISCategoryUnregistration(ByVal registerType As Type)
        Dim regKey As String = String.Format("HKEY_CLASSES_ROOT\CLSID\{{{0}}}", registerType.GUID)
        ControlsCommands.Unregister(regKey)

    End Sub

#End Region
#End Region

    Private m_pEnabled As Boolean
    Private m_pHookHelper As IHookHelper

    ' A creatable COM class must have a Public Sub New() 
    ' with no parameters, otherwise, the class will not be 
    ' registered in the COM registry and cannot be created 
    ' via CreateObject.
    Public Sub New()
        MyBase.New()

        MyBase.m_category = "Sample_Pan_VBNET/Zoom"
        MyBase.m_caption = "Undo Extent"
        MyBase.m_message = "Go to Previous Screen location"
        MyBase.m_toolTip = "Draw Previous Extent"
        MyBase.m_name = "Sample_Pan/Zoom_Undo Extent"

        Dim res() As String = GetType(GoBackToPreviousExtent).Assembly.GetManifestResourceNames()
        If res.GetLength(0) > 0 Then
            MyBase.m_bitmap = New System.Drawing.Bitmap(GetType(GoBackToPreviousExtent).Assembly.GetManifestResourceStream("PanZoomVBNET.UnDoDraw.bmp"))
        End If
        m_pHookHelper = New HookHelperClass
    End Sub

    Public Overrides Sub OnClick()
        'Get the active view
        Dim pActiveView As IActiveView = CType(m_pHookHelper.FocusMap, IActiveView)

        'Get the extent stack
        Dim pMapExtent As IExtentStack = CType(pActiveView.ExtentStack, IExtentStack)

        'Undo the extent view  
        If pMapExtent.CanUndo() Then
            pMapExtent.Undo()
        End If
    End Sub

    Public Overrides Sub OnCreate(ByVal hook As Object)

        m_pHookHelper.Hook = hook
        m_pEnabled = True

    End Sub

    Public Overrides ReadOnly Property Enabled() As Boolean
        Get
            If m_pHookHelper.FocusMap Is Nothing Then Exit Property

            'Get the active view
            Dim pActiveView As IActiveView = CType(m_pHookHelper.FocusMap, IActiveView)

            'Get the extent stack
            Dim pMapStack As IExtentStack = CType(pActiveView.ExtentStack, IExtentStack)

            'Can the extent be undone
            Return m_pEnabled = pMapStack.CanUndo()
        End Get
    End Property
End Class