Java 使用自己的对象从JTree拖放到JList
我有一个JTree和DefaultMutableTreeNodes。在某些级别上,这些节点是用我自己的可序列化对象初始化的。总共有两种不同类型的对象(称为“步骤”和“顺序”)。我希望能够只删除使用这两个对象之一初始化的节点。任何其他仅仅是字符串的节点都不应该是可拖放的。一个“顺序”可以包含多个“步骤”。如果它们被插入JList,我希望能够将它们拖到JPanel上。如果删除了“订单”,则所有“步骤”都应插入,如果只删除了“步骤”,则只应插入特定的“步骤” SSCCE下面强> JTree:Java 使用自己的对象从JTree拖放到JList,java,swing,drag-and-drop,jlist,jtree,Java,Swing,Drag And Drop,Jlist,Jtree,我有一个JTree和DefaultMutableTreeNodes。在某些级别上,这些节点是用我自己的可序列化对象初始化的。总共有两种不同类型的对象(称为“步骤”和“顺序”)。我希望能够只删除使用这两个对象之一初始化的节点。任何其他仅仅是字符串的节点都不应该是可拖放的。一个“顺序”可以包含多个“步骤”。如果它们被插入JList,我希望能够将它们拖到JPanel上。如果删除了“订单”,则所有“步骤”都应插入,如果只删除了“步骤”,则只应插入特定的“步骤” SSCCE下面 JTree: tree =
tree = new JTree();
tree.setShowsRootHandles(true);
tree.setRootVisible(false);
tree.setDragEnabled(true);
tree.setModel(treeModel);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
JPanel:
public class TablePanel extends JPanel
{
private static final long serialVersionUID = 3216206960422611905L;
public TablePanel()
{
super();
setLayout(new MigLayout("", "[grow]", "[][grow]"));
JProgressBar progressBar = new JProgressBar();
progressBar.setMaximum(28800); // 8 hours in seconds
progressBar.setStringPainted(true);
add(progressBar, "cell 0 0,growx");
DefaultListModel<Step> listModel = new DefaultListModel<Step>();
JList<Step> list = new JList<Step>();
list.setModel(listModel);
setDropTarget(new DropTarget(this, TransferHandler.COPY, new DropTargetAdapter()
{
private int index = 0;
private int amount = 0;
@Override
public void drop(DropTargetDropEvent dtde)
{
amount = 0;
index = 0;
}
@Override
public void dragExit(DropTargetEvent dte)
{
if (listModel.size() > 0)
{
if (amount == 1)
{
listModel.remove(index);
}
else
{
for (int i = 0; i < amount; i++)
{
listModel.remove(index + i);
}
}
amount = 0;
}
}
@Override
public void dragEnter(DropTargetDragEvent dtde)
{
try
{
Transferable tr = dtde.getTransferable();
if (dtde.isDataFlavorSupported(Order.auftragFlavor))
{
Order a = (Order) tr.getTransferData(Order.auftragFlavor); // Wrong, how do I get this?
dtde.acceptDrag(DnDConstants.ACTION_COPY);
amount = a.getSteps().size();
}
else if (dtde.isDataFlavorSupported(Step.arbeitsgangFlavor))
{
Step ag = (Step) tr.getTransferData(Step.arbeitsgangFlavor);
dtde.acceptDrag(DnDConstants.ACTION_COPY);
amount = 1;
}
else
{
dtde.rejectDrag();
}
}
catch (Exception e)
{
e.printStackTrace();
dtde.rejectDrag();
}
}
@Override
public void dragOver(DropTargetDragEvent dtde)
{
try
{
Transferable tr = dtde.getTransferable();
if (dtde.isDataFlavorSupported(Order.auftragFlavor))
{
Order a = (Order) tr.getTransferData(Order.auftragFlavor); // Wrong, how do I get this?
dtde.acceptDrag(DnDConstants.ACTION_COPY);
amount = a.getSteps().size();
}
else if (dtde.isDataFlavorSupported(Step.arbeitsgangFlavor))
{
Step ag = (Step) tr.getTransferData(Step.arbeitsgangFlavor);
dtde.acceptDrag(DnDConstants.ACTION_COPY);
amount = 1;
}
else dtde.rejectDrag();
}
catch (Exception e)
{
e.printStackTrace();
dtde.rejectDrag();
}
}
}, true, null));
add(list, "cell 0 1,grow");
}
}
但不是仅仅是字符串的节点
您可以使用TransferHandler\createTransferable(…)
方法来获取DefaultMutableTreeNode
import java.awt.*;
导入java.awt.datatransfer.*;
导入java.awt.dnd.*;
导入java.io.*;
导入java.util.*;
导入javax.activation.*;
导入javax.swing.*;
导入javax.swing.tree.*;
公共类Test2{
公共JComponent makeUI(){
DefaultMutableTreeNode根=新的DefaultMutableTreeNode(“根”);
DefaultMutableTreeNode字符串1=新的DefaultMutableTreeNode(“字符串1”);
DefaultMutableTreeNode order1=新的DefaultMutableTreeNode(新的ParentObject());
order1.add(新的DefaultMutableTreeNode(新的ChildObject());
order1.add(新的DefaultMutableTreeNode(新的ChildObject());
string1.add(order1);
root.add(string1);
DefaultTreeModel模型=新的DefaultTreeModel(根);
JTree树=新的JTree(模型);
tree.setShowsRootHandles(真);
tree.setRootVisible(false);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_tree_SELECTION);
setTransferHandler(新的TreeTransferHandler());
tree.setDragEnabled(true);
DefaultListModel listModel=新的DefaultListModel();
JList list=新JList();
list.setModel(listModel);
setDropTarget(新DropTarget(list,TransferHandler.COPY,new DropTargetAdapter()){
私人作废打印(可转让tr){
试一试{
对象节点=tr.getTransferData(TreeTransferHandler.FLAVOR);
System.out.println(节点);//我想要实际的对象
}捕获(无支持的LavorException | IOException ex){
例如printStackTrace();
}
}
@凌驾
公共作废删除(DropTargetDropEvent dtde){
if(dtde.isDataFlavorSupported(TreeTransferHandler.FLAVOR)){
打印(dtde.getTransferable());
}
}
@重写公共void dragExit(DropTargetEvent dte){}
@重写公共无效dragEnter(DropTargetDragEvent dtde){}
@重写公共无效dragOver(DropTargetDragEvent dtde){}
},true,null));
JPanel contentPane=newjpanel(newgridlayout(1,2));
setboorder(BorderFactory.createEmptyByOrder(5,5,5,5));
添加(新的JScrollPane(树),BorderLayout.WEST);
添加(新的JScrollPane(列表),BorderLayout.CENTER);
返回内容窗格;
}
公共静态void main(字符串[]args){
invokeLater(新的Runnable(){
@重写公共无效运行(){
试一试{
JFrame f=新的JFrame();
f、 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f、 getContentPane().add(新Test2().makeUI());
f、 立根(100100450300);
f、 setVisible(真);
}捕获(例外e){
e、 printStackTrace();
}
}
});
}
}
类ParentObject实现可序列化{
公共ArrayList getChildren(){
返回新的ArrayList();
}
@凌驾
公共字符串toString(){
返回“ParentObject”;
}
}
类ChildObject实现了可序列化{
@凌驾
公共字符串toString(){
返回“ChildObject”;
}
}
类TreeTransferHandler扩展了TransferHandler{
公共静态最终DataFlavor=新激活DataFlavor(
DefaultMutableTreeNode[]类,
DataFlavor.javaJVMLocalObjectMimeType,
“DefaultMutableTreeNode数组”);
@覆盖受保护的可转移组件(JComponent c){
JTree源=(JTree)c;
树路径[]路径=source.getSelectionPath();
DefaultMutableTreeNode[]节点=新的DefaultMutableTreeNode[path.length];
for(int i=0;i
为了更快地获得更好的帮助,请发布一个or。我添加了一个示例。希望这是足够的帮助了很多,谢谢!我读过关于TransferHandler的文章,但不确定,也不知道该怎么做。对不起,我不能再投票了,因为我还有不到15次的重复。@aterai你能帮我吗
public class Test extends JFrame
{
private static final long serialVersionUID = 1L;
private JPanel contentPane;
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
try
{
Test window = new Test();
window.setVisible(true);
}
catch (Exception e)
{
e.printStackTrace();
}
}
});
}
public Test()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
DefaultMutableTreeNode string1 = new DefaultMutableTreeNode("String 1");
DefaultMutableTreeNode order1 = new DefaultMutableTreeNode(new ParentObject());
order1.add(new DefaultMutableTreeNode(new ChildObject()));
order1.add(new DefaultMutableTreeNode(new ChildObject()));
string1.add(order1);
root.add(string1);
DefaultTreeModel model = new DefaultTreeModel(root);
JTree tree = new JTree(model);
tree.setShowsRootHandles(true);
tree.setRootVisible(false);
tree.setDragEnabled(true);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
contentPane.add(tree, BorderLayout.WEST);
CustPanel panel = new CustPanel();
contentPane.add(panel, BorderLayout.CENTER);
}
}
class CustPanel extends JPanel
{
private static final long serialVersionUID = 1L;
public CustPanel()
{
super();
setLayout(new MigLayout("", "[grow]", "[][grow]"));
JProgressBar progressBar = new JProgressBar();
add(progressBar, "cell 0 0,growx");
DefaultListModel<ChildObject> listModel = new DefaultListModel<ChildObject>();
JList<ChildObject> list = new JList<ChildObject>();
list.setModel(listModel);
setDropTarget(new DropTarget(this, TransferHandler.COPY, new DropTargetAdapter()
{
@Override
public void drop(DropTargetDropEvent dtde)
{
Transferable tr = dtde.getTransferable();
if (dtde.isDataFlavorSupported(DataFlavor.stringFlavor))
{
try
{
System.out.println((String) tr.getTransferData(DataFlavor.stringFlavor)); // I want the actual object
}
catch (UnsupportedFlavorException | IOException e)
{
e.printStackTrace();
}
}
}
@Override
public void dragExit(DropTargetEvent dte)
{
}
@Override
public void dragEnter(DropTargetDragEvent dtde)
{
Transferable tr = dtde.getTransferable();
if (dtde.isDataFlavorSupported(DataFlavor.stringFlavor))
{
try
{
System.out.println((String) tr.getTransferData(DataFlavor.stringFlavor)); // I want the actual object
}
catch (UnsupportedFlavorException | IOException e)
{
e.printStackTrace();
}
}
}
@Override
public void dragOver(DropTargetDragEvent dtde)
{
Transferable tr = dtde.getTransferable();
if (dtde.isDataFlavorSupported(DataFlavor.stringFlavor))
{
try
{
System.out.println((String) tr.getTransferData(DataFlavor.stringFlavor)); // I want the actual object
}
catch (UnsupportedFlavorException | IOException e)
{
e.printStackTrace();
}
}
}
}, true, null));
add(list, "cell 0 1,grow");
}
}
class ParentObject implements Serializable
{
private static final long serialVersionUID = 1279985471254050120L;
public ArrayList<ChildObject> getChildren()
{
return new ArrayList<ChildObject>();
}
@Override
public String toString()
{
return "ParentObject";
}
}
class ChildObject implements Serializable
{
private static final long serialVersionUID = -5833860202973614790L;
@Override
public String toString()
{
return "ChildObject";
}
}
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.io.*;
import java.util.*;
import javax.activation.*;
import javax.swing.*;
import javax.swing.tree.*;
public class Test2 {
public JComponent makeUI() {
DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
DefaultMutableTreeNode string1 = new DefaultMutableTreeNode("String 1");
DefaultMutableTreeNode order1 = new DefaultMutableTreeNode(new ParentObject());
order1.add(new DefaultMutableTreeNode(new ChildObject()));
order1.add(new DefaultMutableTreeNode(new ChildObject()));
string1.add(order1);
root.add(string1);
DefaultTreeModel model = new DefaultTreeModel(root);
JTree tree = new JTree(model);
tree.setShowsRootHandles(true);
tree.setRootVisible(false);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setTransferHandler(new TreeTransferHandler());
tree.setDragEnabled(true);
DefaultListModel<ChildObject> listModel = new DefaultListModel<ChildObject>();
JList<ChildObject> list = new JList<ChildObject>();
list.setModel(listModel);
list.setDropTarget(new DropTarget(list, TransferHandler.COPY, new DropTargetAdapter() {
private void print(Transferable tr) {
try {
Object node = tr.getTransferData(TreeTransferHandler.FLAVOR);
System.out.println(node); // I want the actual object
} catch (UnsupportedFlavorException | IOException ex) {
ex.printStackTrace();
}
}
@Override
public void drop(DropTargetDropEvent dtde) {
if (dtde.isDataFlavorSupported(TreeTransferHandler.FLAVOR)) {
print(dtde.getTransferable());
}
}
@Override public void dragExit(DropTargetEvent dte) {}
@Override public void dragEnter(DropTargetDragEvent dtde) {}
@Override public void dragOver(DropTargetDragEvent dtde) {}
}, true, null));
JPanel contentPane = new JPanel(new GridLayout(1, 2));
contentPane.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
contentPane.add(new JScrollPane(tree), BorderLayout.WEST);
contentPane.add(new JScrollPane(list), BorderLayout.CENTER);
return contentPane;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override public void run() {
try {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new Test2().makeUI());
f.setBounds(100, 100, 450, 300);
f.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}
class ParentObject implements Serializable {
public ArrayList<ChildObject> getChildren() {
return new ArrayList<ChildObject>();
}
@Override
public String toString() {
return "ParentObject";
}
}
class ChildObject implements Serializable {
@Override
public String toString() {
return "ChildObject";
}
}
class TreeTransferHandler extends TransferHandler {
public static final DataFlavor FLAVOR = new ActivationDataFlavor(
DefaultMutableTreeNode[].class,
DataFlavor.javaJVMLocalObjectMimeType,
"Array of DefaultMutableTreeNode");
@Override protected Transferable createTransferable(JComponent c) {
JTree source = (JTree) c;
TreePath[] paths = source.getSelectionPaths();
DefaultMutableTreeNode[] nodes = new DefaultMutableTreeNode[paths.length];
for (int i = 0; i < paths.length; i++) {
nodes[i] = (DefaultMutableTreeNode) paths[i].getLastPathComponent();
}
return new DataHandler(nodes, FLAVOR.getMimeType());
}
@Override public int getSourceActions(JComponent c) {
return TransferHandler.COPY;
}
}