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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#region check dragging conditions
m_Dragging = false;
m_toc.MousePointer = ESRI.ArcGIS.SystemUI.esriControlsMousePointer.esriPointerDefault;
if (m_toc == null)
return ;
if (m_toc.Buddy == null)
return ;
if (m_DragToCorrectPos == false)
return;
m_DragToCorrectPos = false;
m_MovingLine.Visible = false;
IMap map=null;
IScene scene=null;
if (m_toc.Buddy is IMapControl2)
{
map = (m_toc.Buddy as IMapControl2).Map;
}
else if (m_toc.Buddy is ESRI.ArcGIS.SceneControl.ISceneControl)
{
scene = (m_toc.Buddy as ESRI.ArcGIS.SceneControl.ISceneControl).Scene;
}
else
{
return;
}
IBasicMap bmap;
if (map != null)
bmap = map as IBasicMap;
else
bmap = scene as IBasicMap;
if (bmap.LayerCount ==0)
return;
#endregion
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)
{
}
}
