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java - 如何在 Java Swing 中获得自定义拖放支持

转载 作者:行者123 更新时间:2023-11-30 11:48:12 25 4
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我已经启用了默认的自定义拖动和对 JTree 的支持,它就像一个魅力:)

我有一棵树,一个文本和一个编辑器 Pane ,如果我将任何节点从树拖到文本区域,它会粘贴文本,但是当我对编辑器 Pane 执行相同操作时,它不会复制纯文本,它复制带有项目符号的文本并更改整个布局。

我所需要的只是将纯文本复制到编辑器 Pane ,只有当我将内容类型设置为“纯文本/文本”时才会发生这种情况,当更改内容类型时它将使用项目符号复制...

有没有可能当我拖放到文本区域/编辑器 Pane 时,而不是节点名称,它应该放置“节点名称+”?“,我用谷歌搜索但只能找到如何启用JLabel 的拖动和支持。

package testing_dragging;

import java.awt.datatransfer.DataFlavor;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JComponent;
import javax.swing.TransferHandler;


public class test_dragging_form extends javax.swing.JFrame {

/**
* Creates new form test_dragging_form
*/
public test_dragging_form() {
initComponents();
}

/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

jScrollPane1 = new javax.swing.JScrollPane();
jTree1 = new javax.swing.JTree();
jScrollPane2 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jScrollPane3 = new javax.swing.JScrollPane();
jEditorPane1 = new javax.swing.JEditorPane();
jLabel1 = new javax.swing.JLabel();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

jTree1.setDragEnabled(true);
jTree1.addMouseMotionListener(new java.awt.event.MouseMotionAdapter() {
public void mouseMoved(java.awt.event.MouseEvent evt) {
jTree1MouseMoved(evt);
}
});
jScrollPane1.setViewportView(jTree1);

jTextArea1.setColumns(20);
jTextArea1.setRows(5);
jTextArea1.setDragEnabled(true);
jScrollPane2.setViewportView(jTextArea1);

try
{
jEditorPane1.setPage("file:///home/rocky/Desktop/test_plan_template.html");
}
catch(Exception ex)
{
System.out.println("Some exception occured"+ ex.getMessage());
}
jEditorPane1.setDragEnabled(true);
jScrollPane3.setViewportView(jEditorPane1);

jLabel1.setText("draglabel");
jLabel1.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
jLabel1MousePressed(evt);
}
});

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(29, 29, 29)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(55, 55, 55)
.addComponent(jLabel1))
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 400, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(99, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGap(0, 12, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 163, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addGap(47, 47, 47)
.addComponent(jLabel1)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jScrollPane3, javax.swing.GroupLayout.PREFERRED_SIZE, 200, javax.swing.GroupLayout.PREFERRED_SIZE))))
);

pack();
}// </editor-fold>

private void jTree1MouseMoved(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
JComponent comp = (JComponent)evt.getSource();
TransferHandler handler = comp.getTransferHandler();


comp.setTransferHandler(handler);

handler.exportAsDrag(comp, evt, TransferHandler.COPY);
}

private void jLabel1MousePressed(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
JComponent comp = (JComponent)evt.getSource();
TransferHandler handler = new TransferHandler("text");

comp.setTransferHandler(handler);
handler.exportAsDrag(comp, evt, TransferHandler.COPY);
}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Set the Nimbus look and feel
*/
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/*
* If Nimbus (introduced in Java SE 6) is not available, stay with the
* default look and feel. For details see
* http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(test_dragging_form.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(test_dragging_form.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(test_dragging_form.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(test_dragging_form.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>

/*
* Create and display the form
*/
java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {
new test_dragging_form().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JEditorPane jEditorPane1;
private javax.swing.JLabel jLabel1;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JScrollPane jScrollPane3;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JTree jTree1;
// End of variables declaration
}

最佳答案

我对自定义拖放有一点经验,也许你的问题有更好的解决方案,但这有效:

为 JEditorPane 制作自定义 dropTarget。它将选择 text/plain DataFlavor 而不是默认的 text/html ;

class JEditorPaneDropTarget extends DropTargetAdapter{

JEditorPaneDropTarget(JEditorPane pane) {
new DropTarget(pane, this);
}

@Override
public void drop(DropTargetDropEvent dtde) {
Transferable tr = dtde.getTransferable();
Object data;
try {
DataFlavor df = new DataFlavor("text/plain; class=java.lang.String");
data = tr.getTransferData(df);
JEditorPane pane = (JEditorPane) ((DropTarget)dtde.getSource()).getComponent();
pane.setText((String)data);
} catch (Exception e) {
//
}
}
}

在 initComponents() 的某处用你的 jEditorPane1 初始化它:

new JEditorPaneDropTarget(jEditorPane1); 

这里没有检查可能的 null 或强制转换异常,因此您也需要这些。阅读有关 DataFlavors 以及如何使用它们的内容。可能有一种方法可以在不编写整个自定义 DropTarget 类的情况下使用正确的 DataFlavor,但我没有找到任何方法。

关于java - 如何在 Java Swing 中获得自定义拖放支持,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8970716/

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