本例要实现的是如何创建定制的MultiItem。-ArcObjects开发-技术专栏-GIS空间站

摘要：

本例要实现的是如何创建定制的MultiItem。

l 要点

需要实现IMultiItem接口，但不需要同时实现Icommand接口。IMultiItem接口包括Caption,itemCaption,ItemBitmap,ItemEnabled,ItemChecked, Message及Name等属性和OnItemClick, OnPopup事件。

·itemCaption,ItemBitmap,ItemEnabled,ItemChecked等属性的参数index表示当前Item的下标索引。

·OnPopup事件的参数hook同Icommand接口的OnCreate事件的参数hook一样，传入ArcGIS的Application实例，同时，该事件返回将要显示的Item数目。

·OnItemClick事件的参数Index表示用户当前点击的Item的索引，用户根据该索引分别定义点击各个Item时实现的功能。

l 程序说明

程序在类模块中实现IMultiItem接口来创建定制自己的MultiItem。

l 代码

Option Explicit

Implements IMultiItem

Private m_pApp As IApplication
'ArcMap的Document

Private m_pMxDoc As IMxDocument
'当前Focus Map

Private m_pMap As IMap
'Map中的层数

Private m_pLayerCnt As Long

Private Property Get IMultiItem_Caption() As String
IMultiItem_Caption = "ZoomToLayers"

End Property

Private Property Get IMultiItem_HelpContextID() As Long

End Property

Private Property Get IMultiItem_HelpFile() As String

End Property

Private Property Get IMultiItem_ItemBitmap(ByVal Index As Long) As esriCore.OLE_HANDLE

End Property

Private Property Get IMultiItem_ItemCaption(ByVal Index As Long) As String    Dim i As Integer
    ' 遍历每一个层
    For i = 0 To m_pLayerCnt - 1
        ' 如果层号与当前Item的Index相同，就设置该Item的Caption
        If Index = i Then
            IMultiItem_ItemCaption = "Zoom to " & m_pMap.Layer(i).Name
        End If
    Next
End Property

Private Property Get IMultiItem_ItemChecked(ByVal Index As Long) As Boolean
End Property
　

Private Property Get IMultiItem_ItemEnabled(ByVal Index As Long) As Boolean
    Dim i As Integer
    ' 遍历每一个层
    For i = 0 To m_pLayerCnt - 1
        '如果层号与当前Item的Index相同,则当前Item的Enable根据该层的Visible设置。
        If Index = i Then
            If m_pMap.Layer(i).Visible Then
                IMultiItem_ItemEnabled = True
            End If
        End If
    Next
End Property

Private Property Get IMultiItem_Message() As String
IMultiItem_Message = "Zooms to the layer."
End Property

Private Property Get IMultiItem_Name() As String
IMultiItem_Name = "ZoomMulti"
End Property

Private Sub IMultiItem_OnItemClick(ByVal Index As Long)
    Dim i As Integer
    Dim pEnv As IEnvelope
    Dim m_BookMark As IAOIBookmark
    ' 遍历每一个层
    For i = 0 To m_pLayerCnt – 1
        '如果层号与当前Item的Index相同,则以该层的AreaOfInterest 为范围执行Zoom
        If Index = i Then
            Set pEnv = m_pMap.Layer(i).AreaOfInterest
            Set m_BookMark = New AOIBookmark
            Set m_BookMark.Location = pEnv
            m_BookMark.ZoomTo m_pMap
            m_pMxDoc.ActiveView.Refresh
        End If
    Next
End Sub

Private Function IMultiItem_OnPopup(ByVal hook As Object) As Long
    Set m_pApp = hook
    ' 获取Map中的层数
    Set m_pMxDoc = m_pApp.Document
    Set m_pMap = m_pMxDoc.FocusMap
    m_pLayerCnt = m_pMap.LayerCount
    ' 显示的Item数等于层数
    IMultiItem_OnPopup = m_pLayerCnt
End Function

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本例要实现的是如何创建定制的MultiItem。

Tags：ArcMap VBA