这个怎么做啊?关于TextArea.....

2004-10-15 05:55:25 135 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

ESP32 LVGL8.1 ——textarea 文本区域 (textarea 26) 提示：本博客作为学习笔记，有错误的地方希望指正文章目录一、textarea 简介1.1概述 Overview1.2部分和风格 Parts and Styles1.3使用 Usage1.3.1 添加文字 Add text1.3.2 占位符 Placeholder1.3.3 删除字符 Delete character1.3.4 移动光标 Move the cursor1.3.5 隐藏光标 Hide the cursor1.3.6 一行模式 One line mode1.3.7 密码模式 Password mo 阅读详情

唉,想了很久了,请问各位朋友,
我创建了一个TextArea对象textArea,
那我怎么对textArea中文本进行剪切,拷贝,粘贴啊?
最好能给个例子,谢谢,拜托了...

...全文

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hhlong

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hhlong 2004-10-19

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谢谢Alan_lz(都市流浪),我想做的也是如同上面例子所实现的,

这个例子我得好好研究研究.

不同的是,我只想用到awt中的组件,而不想用到swing组件来实现所以功能,

现在就差对TextArear的剪切,拷贝,粘贴了.

不知我所想的能不能实现,还有谁能帮帮我??

Alan_lz 2004-10-18

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试一试JTextArea.

例子有点长，但确实可以运行。

// Example Swing program to illustrate aa simple text editor with a menu bar
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.border.*;
import java.io.*;

public class SimpleEditor2 extends JFrame {
// Instance variables for the GUI compnents used.
JPanel topPanel;
JPanel editorPanel;
JScrollPane scroller;
JTextArea editor;
JMenuBar menuBar;
JMenu fileMenu;
JMenu editMenu;
JMenuItem fileMenuLoad;
JMenuItem fileMenuSave;
JMenuItem fileMenuExit;
JMenuItem editMenuCut;
JMenuItem editMenuCopy;
JMenuItem editMenuPaste;
// The constructor builds the window and displays it.
public SimpleEditor2() {
// Create and Configure the various panels
topPanel = new JPanel();
topPanel.setLayout(new BorderLayout());
editorPanel = new JPanel();
editorPanel.setLayout(new BorderLayout());
editorPanel.setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
scroller = new JScrollPane();
// The editor component handles all text display and editing.
// It is given a width of 40 characters.
editor = new JTextArea();
editor.setColumns(40);
// Configure the top-level JFrame.
setTitle("Very Simple Editor");
getContentPane().add(topPanel, BorderLayout.CENTER);
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
// Now assemble the components
topPanel.add(editorPanel, BorderLayout.CENTER);
editorPanel.add(scroller, BorderLayout.CENTER);
scroller.getViewport().add(editor);
// Create the menu bar, making use of helper methods
menuBar = new JMenuBar();
setJMenuBar(menuBar);
addFileMenu();
addEditMenu();
pack();
setSize(400, 300);
setVisible(true);
}
// Add the File menu to the menu bar.
private void addFileMenu() {
fileMenu = new JMenu("File");
fileMenuLoad = new JMenuItem("Load...");
fileMenuLoad.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
loadFile();
}
});
fileMenu.add(fileMenuLoad);
fileMenuSave = new JMenuItem("Save...");
fileMenuSave.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
saveFile();
}
});
fileMenu.add(fileMenuSave);
fileMenu.addSeparator();
fileMenuExit = new JMenuItem("Exit");
fileMenuExit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
fileMenu.add(fileMenuExit);
menuBar.add(fileMenu);
}
// Add the Edit menu to the menu bar.
private void addEditMenu() {
editMenu = new JMenu("Edit");
editMenuCut = new JMenuItem("Cut");
editMenuCut.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cut();
}
});
editMenu.add(editMenuCut);
editMenuCopy = new JMenuItem("Copy");
editMenuCopy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
copy();
}
});
editMenu.add(editMenuCopy);
editMenuPaste = new JMenuItem("Paste");
editMenuPaste.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
paste();
}
});
editMenu.add(editMenuPaste);
menuBar.add(editMenu);
}
// The following methods implement the button click behaviour.
// Display a file dialog and load a file.
private void loadFile() {
JFileChooser fc = new JFileChooser();
int returnVal = fc.showOpenDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
try {
editor.read(new FileReader(file), null);
} catch (IOException e) {}
}
}
// Display a save file dialog and save the current file.
private void saveFile() {
JFileChooser fc = new JFileChooser();
int returnVal = fc.showSaveDialog(this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
try {
editor.write(new FileWriter(file));
} catch (IOException e) {}
}
}
// Cut, copy and paste are implemented using methods provided by a
// superclass of the JTextArea class, and work with the system
// clipboard.
// The requestFocus method is used to make the JTextArea the active
// component the input events.
private void cut() {
editor.cut();
editor.requestFocus();
}
private void copy() {
editor.copy();
editor.requestFocus();
}
private void paste() {
editor.paste();
editor.requestFocus();
}
public static void main(final String[] args) {
final SimpleEditor2 editor = new SimpleEditor2();
}
}

cold_blooded 2004-10-18

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顶 Alan_lz(都市流浪)

yocean0416 2004-10-18

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配服,能把swing做成这样,很牛

这个怎么做啊?关于TextArea.....

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