ArcGIS Engine开发－TOCControl中实现图层的拖放

　　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)

{

}

posted on 2006-09-14 13:14 西西吹雪阅读(5507) 评论(18) 编辑收藏举报

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