PIE SDK 基于Dot net bar实现比例尺控件

最近在搭建主界面的过程中，为了界面美观大方，使用了Dot net bar。但是，在Dot net bar的状态栏中放置PIE SDK自带的比例尺控件，运行主界面程序后，比例尺控件始终不显示比例尺信息，得不到想要的效果。如果使用Windows Form自带的状态栏，则能够正常显示比例尺信息。我猜想，可能是PIE SDK自带的比例尺控件与Dot net bar不兼容。我参考了官方博客（https://www.cnblogs.com/PIESat/p/10272779.html），利用Dot net bar拓展实现了比例尺控件。

基于Dot net bar，利用PIE SDK自带的比例尺控件（代码如下），运行程序后的显示效果如下图（不能正常显示比例尺信息）：

  public FormMain()
         {
             InitializeComponent();
             mapControlMain.OnExtentUpdated += mapControlMain_OnExtentUpdated;//鹰眼图
             ///比例尺控件
             //Common.MapScaleCommandControl mapScaleControl = new Common.MapScaleCommandControl();
             //mapScaleControl.Control = comboBoxItem_MapScale;
             //mapScaleControl.OnCreate(mapControlMain);
             MapScaleCommandControl mapScale = new MapScaleCommandControl();
             mapScale.Control = comboBoxItem_MapScale;
             mapScale.OnCreate(mapControlMain);
             //进度条//首先隐藏需要时显现
             this.progressBarItem.Visible = false;
             Control.CheckForIllegalCrossThreadCalls = false;
         }

利用基于Dot net bar拓展实现的比例尺控件（代码如下），运行程序后显示的效果如下图（可正常显示比例尺信息）：

 public FormMain()
         {
             InitializeComponent();
             mapControlMain.OnExtentUpdated += mapControlMain_OnExtentUpdated;//鹰眼图
             ///比例尺控件
             Common.MapScaleCommandControl mapScaleControl = new Common.MapScaleCommandControl();
             mapScaleControl.Control = comboBoxItem_MapScale;
             mapScaleControl.OnCreate(mapControlMain);
             //MapScaleCommandControl mapScale = new MapScaleCommandControl();
             //mapScale.Control = comboBoxItem_MapScale;
             //mapScale.OnCreate(mapControlMain);
             //进度条//首先隐藏需要时显现
             this.progressBarItem.Visible = false;
             Control.CheckForIllegalCrossThreadCalls = false;
         }

利用Dot net bar拓展实现的比例尺控件代码如下：

 /// <summary>
     /// 比例尺控件
     /// </summary>
     #region
     class MapScaleCommandControl : PIE.Controls.BaseCommandControl
     {
         #region 成员变量
         /// <summary>
         /// ToolStripComboBox
         /// </summary>
         private DevComponents.DotNetBar.ComboBoxItem m_DotNetBarComboxItem = null;
         #endregion

         /// <summary>
         /// 构造函数
         /// </summary>
         public MapScaleCommandControl()
         {
             this.Caption = "";
             this.Name = "";
             this.Checked = false;
             this.Enabled = false;
         }
         /// <summary>
         /// Control
         /// </summary>
         public override object Control
         {
             get
             {
                 return m_DotNetBarComboxItem;
             }
             set
             {
                 m_DotNetBarComboxItem = value as DevComponents.DotNetBar.ComboBoxItem;
             }
         }
         /// <summary>
         /// 是否可用
         /// </summary>
         public override bool Enabled
         {
             get
             {
                 if (m_Hook == null || m_HookHelper.ActiveView.FocusMap.LayerCount < ) return false;
                 return true;
             }
             protected set
             {
                 base.Enabled = value;
             }
         }
         /// <summary>
         /// 创建插件对象
         /// </summary>
         /// <param name="hook"></param>
         public override void OnCreate(object hook)
         {
             if (hook == null) return;
             if (!(hook is PIE.Carto.IPmdContents)) return;
             this.Enabled = true;
             m_Hook = hook;
             m_HookHelper.Hook = hook;

             if (m_DotNetBarComboxItem == null) return;
             DevComponents.DotNetBar.ComboBoxItem comboxItem = this.m_DotNetBarComboxItem as DevComponents.DotNetBar.ComboBoxItem;
             if (comboxItem == null) return;

             comboxItem.Items.Add("1:500");
             comboxItem.Items.Add("1:1000");
             comboxItem.Items.Add("1:5000");
             comboxItem.Items.Add("1:10000");
             comboxItem.Items.Add("1:50000");
             comboxItem.Items.Add("1:100000");
             comboxItem.Items.Add("1:500000");
             comboxItem.Items.Add("1:1000000");
             //comboxItem.KeyPress += comboxItem_KeyPress;
             comboxItem.SelectedIndexChanged += comboxItem_SelectedIndexChanged;
             (hook as PIE.AxControls.MapControl).OnExtentUpdated += MapScaleCommandControl_OnExtentUpdated;
         }
         void comboxItem_SelectedIndexChanged(object sender, EventArgs e)
         {
             //获取选中的比例尺
             string strScale = m_DotNetBarComboxItem.Text.ToString();
             int count = strScale.Length;
             if (count < ) return;
             string str = strScale.Substring(, count - );
             double scale = Convert.ToDouble(str);
             if (scale < ) return;

             //改变地图的比例尺并更新
             m_HookHelper.ActiveView.DisplayTransformation.MapScale = scale;
             m_HookHelper.ActiveView.PartialRefresh(PIE.Carto.ViewDrawPhaseType.ViewAll);
         }
         private void MapScaleCommandControl_OnExtentUpdated(object sender, bool sizeChanged, PIE.Geometry.IEnvelope newEnvelope)
         {
             string strScale = m_HookHelper.ActiveView.DisplayTransformation.MapScale.ToString();
             double scale = Convert.ToDouble(strScale);
             strScale = "1:" + scale.ToString("");
             m_DotNetBarComboxItem.ComboBoxEx.Text = strScale;
             this.m_DotNetBarComboxItem.Text = strScale;
         }
         /// <summary>
         /// 比例尺文本变化事件
         /// </summary>
         /// <param name="sender"></param>
         /// <param name="e"></param>
         void comboxItem_TextChanged(object sender, EventArgs e)
         {
             //获取选中的比例尺
             string strScale = m_DotNetBarComboxItem.Text.ToString();
             int count = strScale.Length;
             if (count < ) return;
             string str = strScale.Substring(, count - );
             double scale = Convert.ToDouble(str);
             if (scale < ) return;

             //改变地图的比例尺并更新
             m_HookHelper.ActiveView.DisplayTransformation.MapScale = scale;
             m_HookHelper.ActiveView.PartialRefresh(PIE.Carto.ViewDrawPhaseType.ViewAll);
         }
         /// <summary>
         /// 点击事件
         /// </summary>
         public override void OnClick()
         {
             base.OnClick();
         }
     }
 #endregion

有不对的地方，请大家批评指正。