ArcGIS Engine开发－TOCControl中实现图层的拖动
来自：http://www.cnblogs.com/watsonyin/archive/2006/09/14/504100.html
TOCControl非常好，不用写一行代码就可以将整个地图的图层信息况显示出来；
TOCControl也非常坏，提供的接口非常少，我认为有用的只有三个：HitTest,SetBuddyControl,Update，而且Update方法一执行，整个TocControl就会重新装载一次，闪烁很厉害，实在是让人烦。要想在TOCControl中拖动图层，也并不容易，得动一动脑筋才行。
下面是我写的一个类，用于实现拖动图层，有需要的朋友，可以复制过去了，看一看。
需要说明的是，该类需要传入一个System.Windows.Forms.Control作为移动图层时显示要移到的位置，所以，在TOCControl上最好上一个Panel，然后传入到TocHelper中。另外，在计算同m_MovingLine显示的位置时，偶没找到什么好办法，只好设置了一个行高的参数。在正常字体时，据我的经验，行高是16，在Windows大字体显示时，行高是18，可以精确的显示。但这毕竟不是一个好办法。哪位高人要是看到了这个帖子，也请指点小弟一二，感激不尽！
public class TocHelper
{
private ESRI.ArcGIS.TOCControl.AxTOCControl m_toc; private ILayer m_layer = null; private object m_other,m_index; private LayerPopmenu m_LyMenu ; private DataFramePopmenu m_FrameMenu = new DataFramePopmenu(); public event CurrentLayerChangedHandler CurrentLayerChanged; private bool m_Dragging = false; private System.Windows.Forms.Control m_MovingLine;// = new System.Windows.Forms.Panel(); public TocHelper(ESRI.ArcGIS.TOCControl.AxTOCControl toc)
{ m_toc = toc; m_LyMenu = new LayerPopmenu(this); m_LyMenu.TOCControl = m_toc; m_FrameMenu.TOCControl = m_toc; m_toc.LabelEdit = esriTOCControlEdit.esriTOCControlManual; ///处理事件 m_toc.OnMouseDown += new ITOCControlEvents_OnMouseDownEventHandler(m_toc_OnMouseDown); m_toc.OnMouseMove += new ITOCControlEvents_OnMouseMoveEventHandler(m_toc_OnMouseMove); m_toc.OnMouseUp += new ITOCControlEvents_OnMouseUpEventHandler(m_toc_OnMouseUp); m_toc.OnBeginLabelEdit += new ITOCControlEvents_OnBeginLabelEditEventHandler(m_toc_OnBeginLabelEdit); m_toc.OnEndLabelEdit += new ITOCControlEvents_OnEndLabelEditEventHandler(m_toc_OnEndLabelEdit);
} public void SetMoveLine(System.Windows.Forms.Control line) { m_MovingLine = line; m_MovingLine.Size = new System.Drawing.Size(100,2); m_MovingLine.BackColor = System.Drawing.Color.Black; m_MovingLine.Visible = false; } private DevExpress.XtraBars.BarManager m_pBarManager; public void SetBarManager(DevExpress.XtraBars.BarManager barMan) { m_pBarManager = barMan; m_LyMenu.SetBarManager(barMan); m_FrameMenu.SetBarManager(barMan); } /// <summary> /// 获取当前图层 /// </summary> public ESRI.ArcGIS.Carto.ILayer CurrentLayer { get { return m_layer; } } /// <summary> /// 刷新视图 /// </summary> /// <param name="layer"></param> private void RefreshView(ILayer layer) { if (m_toc == null) return; if (m_toc.Buddy == null) return; IActiveView pView = null; if (m_toc.Buddy is ESRI.ArcGIS.MapControl.IMapControl2) { pView = (m_toc.Buddy as ESRI.ArcGIS.MapControl.IMapControl2).ActiveView; } else if (m_toc.Buddy is ESRI.ArcGIS.SceneControl.ISceneControl) { IScene scene = (m_toc.Buddy as ESRI.ArcGIS.SceneControl.ISceneControl).Scene; if (scene is IActiveView) pView = scene as IActiveView; } if (pView != null) { if (layer != null) pView.PartialRefresh(esriViewDrawPhase.esriViewGeography,layer,pView.Extent); else pView.Refresh(); } } private int m_DragStartY; public int MouseX,MouseY; private int m_TextHeight = 18; private void m_toc_OnMouseDown(object sender, ITOCControlEvents_OnMouseDownEvent e) { ///选中对象 ITOCControl m_TOCControl = (ITOCControl) m_toc.Object; esriTOCControlItem item =esriTOCControlItem.esriTOCControlItemNone; ILayer layer = null; IBasicMap map = null; m_TOCControl.HitTest(e.x,e.y,ref item,ref map,ref layer,ref m_other,ref m_index); MouseX = e.x;MouseY =e.y; m_DragStartY = e.y; //设置当前图层// if (item == esriTOCControlItem.esriTOCControlItemLayer)// { if (m_layer != layer) { m_layer = layer; if (CurrentLayerChanged != null) CurrentLayerChanged(); }// }// else// {// if (m_layer != null)// {// m_layer = null;// if (CurrentLayerChanged != null)// CurrentLayerChanged();// }// } m_LyMenu.CurrentLayer = m_layer; m_FrameMenu.CurrentLayer = m_layer; //如果点中的图例，则弹出符号设置窗口 if ((e.button == 1) && (item == esriTOCControlItem.esriTOCControlItemLegendClass)) { ILegendGroup legendGroup; ILegendClass legendClass; legendGroup = m_other as ILegendGroup; Debug.Assert(legendGroup != null); legendClass = legendGroup.get_Class(Convert.ToInt32(m_index.ToString())); Debug.Assert(legendClass != null); ISymbol pSymbol = legendClass.Symbol; //选择符号窗口代码去掉了。 return; } //如果是鼠标右键，则弹出右键菜单 if (e.button == 2) { System.Diagnostics.Debug.Assert(m_pBarManager != null); if ((item == esriTOCControlItem.esriTOCControlItemLayer) && (layer != null)) { m_pBarManager.SetPopupContextMenu(m_toc,m_LyMenu.PopMenu); } else if (item == esriTOCControlItem.esriTOCControlItemMap) { m_pBarManager.SetPopupContextMenu(m_toc,m_FrameMenu.PopMenu); } else { m_pBarManager.SetPopupContextMenu(m_toc,null); } return; } //如果鼠标左键选中了一个图层，则设为拖动状态 if ((e.button == 1) && (layer != null)) { m_Dragging = true; m_DestLayer = null; } m_TextHeight = m_toc.Parent.Font.Height+2; } private int GetLayerIndex(IBasicMap map,ILayer layer,bool DragUp) { ILayer tmpLayer; for (int i=0;i<=map.LayerCount-1;i++) { tmpLayer = map.get_Layer(i); if (tmpLayer == layer) { if (DragUp == true) return i-1; else return i; } } return 0; } private int GetLayerIndex(ICompositeLayer groupLayer,ILayer layer,bool DragUp) { for (int i=0;i<=groupLayer.Count-1;i++) { if (groupLayer.get_Layer(i) == layer) { if (i == groupLayer.Count-1) return i; else { if (DragUp == true) return i; else return i+1; } } } return 0; } private ILayer m_DestLayer; private bool m_DestIsMap = false; private bool m_DragToCorrectPos = false; private void m_toc_OnMouseMove(object sender, ITOCControlEvents_OnMouseMoveEvent e) { ///如果正在拖动图层 if (m_Dragging == true) { m_DragToCorrectPos = false; ITOCControl m_TOCControl = (ITOCControl) m_toc.Object; esriTOCControlItem item =esriTOCControlItem.esriTOCControlItemNone; ILayer layer = null; IBasicMap map = null; object other = null; object index = null; m_TOCControl.HitTest(e.x,e.y,ref item,ref map,ref layer,ref other,ref index); m_DestIsMap = false; m_DestLayer = layer; if (item == esriTOCControlItem.esriTOCControlItemMap) { m_DestIsMap = true; int yy; yy = Convert.ToInt32(Math.Floor(e.y/m_TextHeight) * m_TextHeight)+m_TextHeight; m_MovingLine.Location = new System.Drawing.Point(30,yy); m_MovingLine.Width = m_toc.Width - 35; m_MovingLine.Visible = true; m_toc.MousePointer = ESRI.ArcGIS.SystemUI.esriControlsMousePointer.esriPointerDefault; m_DragToCorrectPos = true; } else if ((item == esriTOCControlItem.esriTOCControlItemLayer) && (layer != m_layer) && (layer != null)) { if (m_DestLayer is IGroupLayer) { m_MovingLine.Visible = false; m_toc.MousePointer = ESRI.ArcGIS.SystemUI.esriControlsMousePointer.esriPointerLabel; m_DragToCorrectPos = true; } else { int yy; if (e.y > m_DragStartY) //向下拖放 { yy = Convert.ToInt32(Math.Floor(e.y/m_TextHeight) * m_TextHeight)+m_TextHeight; } else //向上拖放 { yy = Convert.ToInt32(Math.Floor(e.y/m_TextHeight) * m_TextHeight); } m_MovingLine.Location = new System.Drawing.Point(30,yy); m_MovingLine.Width = m_toc.Width - 35; m_MovingLine.Visible = true; m_toc.MousePointer = ESRI.ArcGIS.SystemUI.esriControlsMousePointer.esriPointerDefault; m_DragToCorrectPos = true; } } else { m_MovingLine.Visible = false; m_toc.MousePointer = ESRI.ArcGIS.SystemUI.esriControlsMousePointer.esriPointerDefault; } } } /// <summary> /// 取得图层的上一级对象，可能是igrouplayer,或ibasicmap /// </summary> /// <param name="map"></param> /// <param name="layer"></param> /// <returns></returns> private object GetLayerParent(IBasicMap map,ILayer layer) { ILayer tmpLayer; for (int i=0;i<= map.LayerCount-1;i++) { tmpLayer = map.get_Layer(i); if (tmpLayer == layer) { return map; } else if (tmpLayer is IGroupLayer) { IGroupLayer ly = FindParentGroupLayer(tmpLayer as IGroupLayer,layer); if (ly != null) return ly; } } return map; } private IGroupLayer FindParentGroupLayer(IGroupLayer groupLayer,ILayer layer) { if (!(groupLayer is ICompositeLayer)) { return groupLayer; } ICompositeLayer comLayer = groupLayer as ICompositeLayer; ILayer tmpLayer; for (int i=0;i<=comLayer.Count-1;i++) { tmpLayer = comLayer.get_Layer(i); if (tmpLayer == layer) return groupLayer; else if (tmpLayer is IGroupLayer) return FindParentGroupLayer(tmpLayer as IGroupLayer,layer); } return null; } /// <summary> /// 在grouplayer中移动图层 /// </summary> /// <param name="pGroupLayer"></param> /// <param name="pLayer"></param> /// <param name="nIndex"></param> private void MoveLayerTo(IGroupLayer pGroupLayer, ILayer pLayer, int nIndex) { ICompositeLayer pCompositeLayer = pGroupLayer as ICompositeLayer;// if(pCompositeLayer.Count < 2)// return ; if(pCompositeLayer.Count-1 == nIndex) { pGroupLayer.Delete(pLayer); pGroupLayer.Add(pLayer); return; } IArray pArray = new ArrayClass(); for(int i = 0; i < pCompositeLayer.Count; i++) { pArray.Add(pCompositeLayer.get_Layer(i)); } pGroupLayer.Clear(); ILayer pLayer1; for(int i = 0; i < pArray.Count; i++) { if(pCompositeLayer.Count == nIndex) { pGroupLayer.Add(pLayer); } pLayer1 = pArray.get_Element(i) as ILayer; if(pLayer1 == pLayer) { continue; } pGroupLayer.Add(pLayer1); } } private void m_toc_OnMouseUp(object sender, ITOCControlEvents_OnMouseUpEvent e) { if (m_Dragging == true) {
check dragging conditions bool destIgnoreGroupLayer = false; if (m_DestIsMap == true) { m_DestLayer = bmap.get_Layer(0); destIgnoreGroupLayer = true; } if (m_DestLayer == null) return; if (m_layer == m_DestLayer) return; bool DragUp; //是否正向上拖放 DragUp = (e.y < m_DragStartY); int destIndex; object buddy = m_toc.Buddy; m_toc.SetBuddyControl(null); try { object srcGroupLayer = GetLayerParent(bmap,m_layer); object destGroupLayer = GetLayerParent(bmap,m_DestLayer); //先删除源图层 if (srcGroupLayer is GroupLayer) (srcGroupLayer as IGroupLayer).Delete(m_layer); else bmap.DeleteLayer(m_layer); //再加入，并移到合适位置 if ((m_DestLayer is IGroupLayer) && (destIgnoreGroupLayer == false)) { (m_DestLayer as IGroupLayer).Add(m_layer); destIndex = GetLayerIndex(m_DestLayer as ICompositeLayer,m_layer,DragUp); MoveLayerTo(m_DestLayer as IGroupLayer,m_layer,destIndex); RefreshView(m_DestLayer); } else if (destGroupLayer is IGroupLayer) { (destGroupLayer as IGroupLayer).Add(m_layer); destIndex = GetLayerIndex(destGroupLayer as ICompositeLayer,m_DestLayer,DragUp); MoveLayerTo(destGroupLayer as IGroupLayer,m_layer,destIndex); RefreshView(destGroupLayer as ILayer); } else { bmap.AddLayer(m_layer); destIndex = GetLayerIndex(bmap,m_DestLayer,DragUp); if (bmap is IMap) (bmap as IMap).MoveLayer(m_layer,destIndex); else if (bmap is IScene) (bmap as IScene).MoveLayer(m_layer,destIndex); } } finally { m_toc.SetBuddyControl(buddy); //重新绑定，并刷新toc } } } private void m_toc_OnBeginLabelEdit(object sender, ITOCControlEvents_OnBeginLabelEditEvent e) { e.canEdit = false; } private void m_toc_OnEndLabelEdit(object sender, ITOCControlEvents_OnEndLabelEditEvent e) { }
}
