链表编辑器

来源：互联网发布：linux vim 查找命令编辑：程序博客网时间：2024/05/22 12:58

可以用数组或者链表实现一个编辑器的功能，各自有各自的优缺点。

这里只实现了单行的输入、删除、左移、右移功能，可以加入换行符实现多行文本编辑功能（但是链表实现这个不是很好设计，十字链表？这个最好还是使用数组），还可以加入文件的读取和存储实现编辑器的打开和保存功能，还可以加入网络连接实现编辑器的网络同步和备份功能。

//ZJSNote.java:

package com.zhuojiaoshou;import javax.swing.*;import java.awt.*;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;/** * Created by JiajieZhuo on 2017/3/5. */public class ZJSNote {    public static void main(String[] args) {        JFrame jFrame = new JFrame();        jFrame.setSize(300, 400);        MyPanel mp = new MyPanel();        jFrame.add(mp);        jFrame.addKeyListener(mp);        mp.addKeyListener(mp);        jFrame.setVisible(true);    }}class Node {    public char value = ' ';    public Node next = null;}class MyPanel extends JPanel implements KeyListener {    Node firstNode = new Node();    Node nowNode = firstNode;    int cursor = 0;    @Override    public void paint(Graphics g) {        // clear screen        super.paint(g);        Node tmpNode = firstNode;        int x = 0;        // word        while (tmpNode.next != null) {            g.drawString("" + tmpNode.next.value, 10 + x * 8, 10);            x++;            tmpNode = tmpNode.next;        }        // cursor        g.drawLine(10 + cursor * 8, 0, 10 + cursor * 8, 10);    }    @Override    public void keyTyped(KeyEvent e) {    }    @Override    public void keyPressed(KeyEvent e) {        if (e.getKeyCode() >= KeyEvent.VK_A && e.getKeyCode() <= KeyEvent.VK_Z) {            if (nowNode.next == null) {                Node newNode = new Node();                newNode.value = e.getKeyChar();                nowNode.next = newNode;                nowNode = newNode;                cursor++;            } else {                Node newNode = new Node();                newNode.value = e.getKeyChar();                newNode.next = nowNode.next;                nowNode.next = newNode;                nowNode = newNode;                cursor++;            }        }        if (e.getKeyCode() == KeyEvent.VK_DELETE) {            if (nowNode.next != null) {                nowNode.next = nowNode.next.next;                cursor--;            }        }        if (e.getKeyCode() == KeyEvent.VK_BACK_SPACE) {            if (cursor > 0) {                Node tmpNode = firstNode;                while (tmpNode.next != nowNode) {                    tmpNode = tmpNode.next;                }                tmpNode.next = nowNode.next;                nowNode = tmpNode;                cursor--;            }        }        if (e.getKeyCode() == KeyEvent.VK_LEFT) {            if (cursor > 0) {                cursor--;                Node tmpNode = firstNode;                while (tmpNode.next != nowNode) {                    tmpNode = tmpNode.next;                }                nowNode = tmpNode;            }        }        if (e.getKeyCode() == KeyEvent.VK_RIGHT) {            if (nowNode.next != null) {                cursor++;                nowNode = nowNode.next;            }        }        repaint();    }    @Override    public void keyReleased(KeyEvent e) {    }}

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