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）：
1 public FormMain() 2 { 3 InitializeComponent(); 4 mapControlMain.OnExtentUpdated += mapControlMain_OnExtentUpdated;//鹰眼图 5 ///比例尺控件 6 //Common.MapScaleCommandControl mapScaleControl = new Common.MapScaleCommandControl(); 7 //mapScaleControl.Control = comboBoxItem_MapScale; 8 //mapScaleControl.OnCreate(mapControlMain); 9 MapScaleCommandControl mapScale = new MapScaleCommandControl(); 10 mapScale.Control = comboBoxItem_MapScale; 11 mapScale.OnCreate(mapControlMain); 12 //进度条//首先隐藏需要时显现 13 this.progressBarItem.Visible = false; 14 Control.CheckForIllegalCrossThreadCalls = false; 15 }
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）：
1 public FormMain() 2 { 3 InitializeComponent(); 4 mapControlMain.OnExtentUpdated += mapControlMain_OnExtentUpdated;//鹰眼图 5 ///比例尺控件 6 Common.MapScaleCommandControl mapScaleControl = new Common.MapScaleCommandControl(); 7 mapScaleControl.Control = comboBoxItem_MapScale; 8 mapScaleControl.OnCreate(mapControlMain); 9 //MapScaleCommandControl mapScale = new MapScaleCommandControl(); 10 //mapScale.Control = comboBoxItem_MapScale; 11 //mapScale.OnCreate(mapControlMain); 12 //进度条//首先隐藏需要时显现 13 this.progressBarItem.Visible = false; 14 Control.CheckForIllegalCrossThreadCalls = false; 15 }
利用Dot net bar拓展实现的比例尺控件代码如下：
1 /// <summary> 2 /// 比例尺控件 3 /// </summary> 4 #region 5 class MapScaleCommandControl : PIE.Controls.BaseCommandControl 6 { 7 #region 成员变量 8 /// <summary> 9 /// ToolStripComboBox 10 /// </summary> 11 private DevComponents.DotNetBar.ComboBoxItem m_DotNetBarComboxItem = null; 12 #endregion 13 14 /// <summary> 15 /// 构造函数 16 /// </summary> 17 public MapScaleCommandControl() 18 { 19 this.Caption = ""; 20 this.Name = ""; 21 this.Checked = false; 22 this.Enabled = false; 23 } 24 /// <summary> 25 /// Control 26 /// </summary> 27 public override object Control 28 { 29 get 30 { 31 return m_DotNetBarComboxItem; 32 } 33 set 34 { 35 m_DotNetBarComboxItem = value as DevComponents.DotNetBar.ComboBoxItem; 36 } 37 } 38 /// <summary> 39 /// 是否可用 40 /// </summary> 41 public override bool Enabled 42 { 43 get 44 { 45 if (m_Hook == null || m_HookHelper.ActiveView.FocusMap.LayerCount < 1) return false; 46 return true; 47 } 48 protected set 49 { 50 base.Enabled = value; 51 } 52 } 53 /// <summary> 54 /// 创建插件对象 55 /// </summary> 56 /// <param name="hook"></param> 57 public override void OnCreate(object hook) 58 { 59 if (hook == null) return; 60 if (!(hook is PIE.Carto.IPmdContents)) return; 61 this.Enabled = true; 62 m_Hook = hook; 63 m_HookHelper.Hook = hook; 64 65 if (m_DotNetBarComboxItem == null) return; 66 DevComponents.DotNetBar.ComboBoxItem comboxItem = this.m_DotNetBarComboxItem as DevComponents.DotNetBar.ComboBoxItem; 67 if (comboxItem == null) return; 68 69 comboxItem.Items.Add("1:500"); 70 comboxItem.Items.Add("1:1000"); 71 comboxItem.Items.Add("1:5000"); 72 comboxItem.Items.Add("1:10000"); 73 comboxItem.Items.Add("1:50000"); 74 comboxItem.Items.Add("1:100000"); 75 comboxItem.Items.Add("1:500000"); 76 comboxItem.Items.Add("1:1000000"); 77 //comboxItem.KeyPress += comboxItem_KeyPress; 78 comboxItem.SelectedIndexChanged += comboxItem_SelectedIndexChanged; 79 (hook as PIE.AxControls.MapControl).OnExtentUpdated += MapScaleCommandControl_OnExtentUpdated; 80 } 81 void comboxItem_SelectedIndexChanged(object sender, EventArgs e) 82 { 83 //获取选中的比例尺 84 string strScale = m_DotNetBarComboxItem.Text.ToString(); 85 int count = strScale.Length; 86 if (count < 3) return; 87 string str = strScale.Substring(2, count - 2); 88 double scale = Convert.ToDouble(str); 89 if (scale < 1) return; 90 91 //改变地图的比例尺并更新 92 m_HookHelper.ActiveView.DisplayTransformation.MapScale = scale; 93 m_HookHelper.ActiveView.PartialRefresh(PIE.Carto.ViewDrawPhaseType.ViewAll); 94 } 95 private void MapScaleCommandControl_OnExtentUpdated(object sender, bool sizeChanged, PIE.Geometry.IEnvelope newEnvelope) 96 { 97 string strScale = m_HookHelper.ActiveView.DisplayTransformation.MapScale.ToString(); 98 double scale = Convert.ToDouble(strScale); 99 strScale = "1:" + scale.ToString("0"); 100 m_DotNetBarComboxItem.ComboBoxEx.Text = strScale; 101 this.m_DotNetBarComboxItem.Text = strScale; 102 } 103 /// <summary> 104 /// 比例尺文本变化事件 105 /// </summary> 106 /// <param name="sender"></param> 107 /// <param name="e"></param> 108 void comboxItem_TextChanged(object sender, EventArgs e) 109 { 110 //获取选中的比例尺 111 string strScale = m_DotNetBarComboxItem.Text.ToString(); 112 int count = strScale.Length; 113 if (count < 3) return; 114 string str = strScale.Substring(2, count - 2); 115 double scale = Convert.ToDouble(str); 116 if (scale < 1) return; 117 118 //改变地图的比例尺并更新 119 m_HookHelper.ActiveView.DisplayTransformation.MapScale = scale; 120 m_HookHelper.ActiveView.PartialRefresh(PIE.Carto.ViewDrawPhaseType.ViewAll); 121 } 122 /// <summary> 123 /// 点击事件 124 /// </summary> 125 public override void OnClick() 126 { 127 base.OnClick(); 128 } 129 } 130 #endregion
有不对的地方，请大家批评指正。