从JTree拖放到具有自己对象的JList
我有一个JTree与DefaultMutableTreeNodes。在某些层次上,这些节点用我自己的可序列化对象初始化为。总共有两种不同类型的对象(称为“步骤”和“订单”)。我希望能够只删除用这两个对象中的任何一个初始化的节点。任何其他只是字符串的节点都不应该被丢弃。一个“订单”可以包含许多“步骤”。我希望能够将它们拖放到JPanel当它们被插入JList。如果“令”被丢弃所有的“步骤”都应该被插入,如果只有一个“步骤”只下降了特定的“步骤”应该被插入。从JTree拖放到具有自己对象的JList
SSCCE below!
的JTree:
tree = new JTree();
tree.setShowsRootHandles(true);
tree.setRootVisible(false);
tree.setDragEnabled(true);
tree.setModel(treeModel);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
的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");
}
}
当你拖动过的JList,则数据应该被插入到列表中给用户的反馈并有可能发生它在列表中。如果不掉线,应该再次移除。
如何将我的对象拖放到JPanel上,而不是只是字符串的节点?
编辑: 随着(String) tr.getTransferData(DataFlavor.stringFlavor)
我能够得到节点的标签,但这不是真正的帮助,因为我不知道这是否是一个令,步骤或只是一个字符串节点。
EDIT2 SSCCE:这仅仅是字符串
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";
}
}
而不是节点?
您可能可以使用TransferHandler#createTransferable(...)
方法获取DefaultMutableTreeNode
。
- TransferHandler#createTransferable(JComponent) (Java Platform SE 8)
- Demo - DropDemo (The Java™ Tutorials > Creating a GUI With JFC/Swing > Drag and Drop and Data Transfer)
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;
}
}
那帮了很多,谢谢!我阅读了有关TransferHandler的内容,但并不确定,也不知道如何。我很抱歉,我无法赞成它,因为我仍然有不到15次的代表。 – TheFreddy1404
为了更好地帮助更快,发布[MCVE]或[短的,独立的,正确的示例](HTTP://www.sscce。组织/)。 –
我已经添加了一个例子。希望这是足够的 – TheFreddy1404