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<extension
         point="org.eclipse.ui.navigator.viewer">
      <viewer viewerId="com.xzbd.views.MainNavigator">
     <!-- …… 篇幅问题省去其他代码 -->
      <dragAssistant
            class="com.xzbd.navigator.dnd.DragAdapterAssistant"
            viewerId="com.xzbd.views.MainNavigator">
      </dragAssistant> 
          
   </extension>

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<extension
         point="org.eclipse.ui.navigator.navigatorContent">
      <navigatorContent
            activeByDefault="true"
            id="com.xzbd.epx.MainNavigatorContent"
            name="mainNavigatorContent"
            labelProvider="com.xzbd.navigator.provider.MainLabelProvider"
            contentProvider="com.xzbd.navigator.provider.MainContentProvider"
            priority="normal">
      <!-- 省略triggerPoints和possibleChildren -->
	         
	  <!-- 新建文件向导 省略-->
	  <!-- 新建文件夹向导 省略-->
         <dropAssistant
               class="com.xzbd.navigator.dnd.DropAdapterAssistant"
               id="com.xzbd.navigator.dnd.DropAdapterAssistant">
            <possibleDropTargets></possibleDropTargets>
         </dropAssistant>
      </navigatorContent>
      <!-- 自定义导航 省略-->
      <!-- 编辑按钮组 省略-->
      <!-- 新建按钮组 省略 -->
   </extension>

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package com.xzbd.navigator.dnd;

import org.eclipse.ui.navigator.resources.ResourceDragAdapterAssistant;

public class DragAdapterAssistant extends ResourceDragAdapterAssistant{
	public static final String ID = "com.xzbd.navigator.dnd.DragAdapterAssistant";
	
}

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package com.xzbd.navigator.dnd;

import org.eclipse.ui.navigator.resources.ResourceDropAdapterAssistant;

public class DropAdapterAssistant extends ResourceDropAdapterAssistant {

	public static final String ID = "com.xzbd.navigator.dnd.DropAdapterAssistant";

}

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package com.xzbd.navigator.dnd;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Objects;
import java.util.Set;

import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.ui.navigator.CommonDropAdapter;
import org.eclipse.ui.navigator.resources.ResourceDropAdapterAssistant;

import com.xzbd.utils.AppPrinter;
import com.xzbd.utils.WorkbenchUtil;


public class DropAdapterAssistant extends ResourceDropAdapterAssistant {

	public static final String ID = "com.xzbd.navigator.dnd.DropAdapterAssistant";

	@Override
	public IStatus handleDrop(CommonDropAdapter aDropAdapter, DropTargetEvent aDropTargetEvent, Object destTarget) {
		
		// 获取当前拖动的数据
		Object data = aDropTargetEvent.data;
		if(Objects.isNull(data)) {
			return Status.CANCEL_STATUS;
		}
		
		// 如果不是类型不是 TreeSelection ，因为导航视图的资源实现自 TreeSelection
		if(!(data instanceof TreeSelection)) {
			return Status.CANCEL_STATUS;
		}
		TreeSelection treeSelection = (TreeSelection)data;
		// 所有拖动资源的项目名
		Set<String> projectNames = new HashSet<>();
		Iterator<?> iterator = treeSelection.iterator();
		while (iterator.hasNext()) {
			String pName = WorkbenchUtil.getProjectName(iterator.next());
			if(pName != null && !pName.isBlank()) {
				projectNames.add(pName);
			}
		}
		// 获取目标资源所在的项目名
		String destProjectName = WorkbenchUtil.getProjectName(destTarget);
		// 如果有一个被拖文件与目标不是在同一个项目，则取消整个拖拽操作
		for(String pName : projectNames) {
			if(!pName.equals(destProjectName)) {
				AppPrinter.println("资源与目标不是同一个项目，取消拖拽" );
				return Status.CANCEL_STATUS;
			}
		}
		
		return super.handleDrop(aDropAdapter, aDropTargetEvent, destTarget);

	}
}