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 < 1) 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 < 3) return;
            string str = strScale.Substring(2, count - 2);
            double scale = Convert.ToDouble(str);
            if (scale < 1) 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("0");
            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 < 3) return;
            string str = strScale.Substring(2, count - 2);
            double scale = Convert.ToDouble(str);
            if (scale < 1) 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。