' Copyright 2012 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.GeomeTry
Imports ESRI.ArcGIS.Controls
Imports ESRI.ArcGIS.ADF.BaseClasses
Imports ESRI.ArcGIS.ADF.CATIDs
Imports System.Runtime.InteropServices

<ComClass(PanDown.ClassId, PanDown.InterfaceId, PanDown.EventsId)> _
Public NotInheritable Class PanDown
    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 = "D45D64D9-142F-443F-B257-9920580E3218"
    Public Const InterfaceId As String = "4A6CDE97-AB5B-46E9-AF1D-DED31863F71E"
    Public Const EventsId As String = "E9CBF10F-DD69-4256-BFF8-A45429696FF2"
#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_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 = "Pan Down"
        MyBase.m_message = "Pan display down by the pan factor percentage"
        MyBase.m_toolTip = "Pan Down"
        MyBase.m_name = "Sample_Pan/Zoom_Pan Down"

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

    Public Overrides Sub OnClick()

        If m_pHookHelper Is Nothing Then
            Return
        End If

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

        'Get the extent
        Dim pEnvelope As IEnvelope = CType(pActiveView.Extent, IEnvelope)

        'Create a point to pan to
        Dim pPoint As IPoint
        pPoint = New PointClass
        pPoint.X = (pEnvelope.XMin + pEnvelope.XMax) / 2
        pPoint.Y = ((pEnvelope.YMin + pEnvelope.YMax) / 2) - (pEnvelope.Height / (100 / GetPanFactor()))

        'Center the envelope on the point
        pEnvelope.CenterAt(pPoint)

        'Set the new extent
        pActiveView.Extent = pEnvelope

        'Refresh the active view
        pActiveView.Refresh()
    End Sub

    Private Function GetPanFactor() As Long
        Return 50
    End Function

    Public Overrides Sub OnCreate(ByVal hook As Object)
        m_pHookHelper.Hook = hook
    End Sub
End Class