By Daniel Du
在Map 3D Geospatial Platform API中，AcMapMap.GroupModified 和AcMapMap.LayerModified 事件的参数类型由AcMapMappingEventArgs 变成了AcMapMapObjectModifiedEventArgs. 这个变化主要是在参数中增加了一个Modification 属性。通过这个属性我们可以判断是什么东西发生了变化。Modification 可能的取值是：
/// <summary>
/// Name property changed during the event.
///</summary>
static const INT32 Name = 1;
/// <summary>
/// Visibility changed during the event.
///</summary>
static const INT32 Visibility = 2;
/// <summary>
/// Layer selectability during the event.
///</summary>
static const INT32 LayerSelectability = 4;
/// <summary>
/// Parent changed during the event.
///</summary>
static const INT32 ParentChanged = 8;
下面是如何使用的示例代码：
[CommandMethod("ListenToLayerChange")]
public void ListenToLayerChange()
{
AcMapMap currentMap = AcMapMap.GetCurrentMap();
currentMap.GroupModified +=
new GroupModifiedHandler(currentMap_GroupModified);
currentMap.LayerModified +=
new LayerModifiedHandler(currentMap_LayerModified);
}
void currentMap_LayerModified(object sender,
AcMapMapObjectModifiedEventArgs args)
{
OutputChanges(args.Modification);
}
void currentMap_GroupModified(object sender,
AcMapMapObjectModifiedEventArgs args)
{
OutputChanges(args.Modification);
}
private static void OutputChanges(int modification)
{
Editor ed = Autodesk.AutoCAD.ApplicationServices.Application
.DocumentManager.MdiActiveDocument.Editor;
///// <summary>
///// Name property changed during the event.
/////</summary>
//static const INT32 Name = 1;
///// <summary>
///// Visibility changed during the event.
/////</summary>
//static const INT32 Visibility = 2;
///// <summary>
///// Layer selectability during the event.
/////</summary>
//static const INT32 LayerSelectability = 4;
///// <summary>
///// Parent changed during the event.
/////</summary>
//static const INT32 ParentChanged = 8;
switch (modification)
{
case 1:
ed.WriteMessage("\n Layer or LayerGroup name is changed.");
break;
case 2:
ed.WriteMessage(" \nLayer or LayerGroup Visibility is changed.");
break;
case 4:
ed.WriteMessage(" \nLayer or LayerGroup LayerSelectability is changed.");
break;
case 8:
ed.WriteMessage(" \nLayer or LayerGroup Parent is changed.");
break;
default:
break;
}
}
当我在任务面板里对图层或者图层组进行更改时，就可以收到哪些发生变化的提示信息。
when I change the name of layer in task pane of Map 3D, the LayerModified event is trigger, with “args.Modification”, I know that it is the layer’s name is changed. Similarly, when I turn on/off a layer, I get a notification of the changes of visibility of layer. And when I drag one layer from one layer group to another, I get a notification saying that the parent of layer is changed.
The result output is as below:
-------------------------------------
Command:
Command: netload
Command: LISTENTOLAYERCHANGE
Layer or LayerGroup name is changed.
Layer or LayerGroup Visibility is changed
Layer or LayerGroup Parent is changed.
Command:
-------------------------------------
Hope this helps.