📄 notepad.java
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{
//响应菜单项"新建"的事件
if(e.getSource()==f_new)
{
if(isCurrentFileSaved())
{
textArea.setText("");
stateBar.setText("新文档");
}
else
{
int i=JOptionPane.showConfirmDialog(null,"文件未保存，是否要保存？","提示",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.WARNING_MESSAGE);
if(i ==JOptionPane.YES_OPTION)
saveFileDialog();
else if(i==JOptionPane.NO_OPTION)
{
textArea.setText("");
stateBar.setText("新文档");
}
else
return;
}
}
//响应菜单项"打开"的事件
if(e.getSource()==f_open)
{
if(isCurrentFileSaved())
{
openFileDialog();
}
else
{
int i=JOptionPane.showConfirmDialog(null,"文件未保存，是否要保存？","提示",JOptionPane.YES_NO_CANCEL_OPTION,JOptionPane.WARNING_MESSAGE);
if(i ==JOptionPane.YES_OPTION)
saveFileDialog();
else if(i==JOptionPane.NO_OPTION)
{
openFileDialog();
}
else
return;
}
}
//响应菜单项"保存"和"按钮"保存"的事件
if((e.getSource()==b_save)||(e.getSource()==f_save))
{
if(isCurrentFileExists)
{
try{
String str=textArea.getText();
FileWriter fw = new FileWriter(tempFile);
fw.write(str);
fw.close();
isCurrentFileExists=true;
tempFile=tempFile;
stateBar.setText("已保存");
}
catch(Exception ex)
{
JOptionPane.showMessageDialog(null, "出错："+ ex.getMessage());
return ;
}
}
else
saveFileDialog();
}
//响应菜单"另存为"的事件
if(e.getSource()==f_saveas)
{
int option=jfc.showDialog(this,"另存为");
String fname = null;
if(option == JFileChooser.APPROVE_OPTION)
{
File f = jfc.getSelectedFile();//如果没有选取文件,下面的jfc.getName(f)将会返回输入的文件名
fname = jfc.getName(f);
if(fname != null && fname.trim().length()>0)
{
if(fname.endsWith(".txt"))
;
else
{
fname = fname.concat(".txt");
}
}
if(f.isFile())
fname = f.getName();
f = jfc.getCurrentDirectory();
f = new File(f.getPath().concat(File.separator).concat(fname));
if(f.exists())
{
int i=JOptionPane.showConfirmDialog(null,"该文件已经存在，确定要覆盖吗？");
if(i ==JOptionPane.YES_OPTION)
;
else
return;
}
try{
f.createNewFile();
String str=textArea.getText();
FileWriter fw = new FileWriter(f);
fw.write(str);
fw.close();
stateBar.setText("已保存");
}
catch(Exception ex)
{
JOptionPane.showMessageDialog(null, "出错："+ ex.getMessage());
return ;
}
}
else
{
JOptionPane.showMessageDialog(null,"文件没有保存!");
}
}
//响应"退出"菜单和"关闭"按钮的事件
if((e.getSource()==f_close)||(e.getSource()==b_close))
{
whenExit();
}
if(e.getSource()==e_copy||e.getSource()==je_copy)
{
copy();
}
if(e.getSource()==e_paste||e.getSource()==je_paste)
{
paste();
}
if(e.getSource()==e_cut||e.getSource()==je_cut)
{
cut();
}
if(e.getSource()==e_clear||e.getSource()==je_clear)
{
clear();
}
if(e.getSource()==e_selectAll||e.getSource()==je_selectAll)
{
selectAll();
}
if(e.getSource()==s_font) //创建字体选择对话框
{
Font font;
font =new Font("新宋体",Font.PLAIN,12);
font = FontChooser.showDialog(this,null,font);
if(font!=null) //判断是否选择了"确定"按钮
{
textArea.setFont(font);
}
else
{
textArea.setFont(textArea.getFont());
}
}
if(e.getSource()==s_color) //创建颜色选择对话框
{
Color c=JColorChooser.showDialog(this,"请选择文字颜色",Color.cyan);
if(c!=null)
{
textArea.setForeground(c);
}
else
textArea.setForeground(textArea.getForeground());
}
if(e.getSource()==h_editor)
{
JOptionPane.showMessageDialog(this,"计科06级5班，郑世杰，200631500155\n superle@vip.qq.com ","关于记事本",JOptionPane.INFORMATION_MESSAGE);
}
}
public static void main (String[] args) //创建一个NotePad的匿名对象
{
new NotePad();
}
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////
/* 此字体对话框的使用方法
* Font font = null;
* font = FontChooser.showDialog(this,null,font);
* textArea.setFont(font);
*/
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
class FontChooser extends JDialog
{
String[] styleList = new String[]
{"常规","粗体","斜体" ,"粗斜体"};
String[] sizeList = new String[]
{"3","4","5","6","7","8","9","10","11","12","13","14","15","16","17",
"18","19","20","22","24","26","28","30","34","39","45","50","60","72"};
MyList StyleList;
MyList FontList ;
MyList SizeList ;
static JLabel Sample = new JLabel();
public static boolean isSelected = false;
private FontChooser(Frame parent,boolean modal,Font font)
{
super (parent,modal);
initAll();
setTitle("字体");
if (font == null) font = Sample.getFont();
FontList.setSelectedItem(font.getName());
SizeList.setSelectedItem(font.getSize()+"");
StyleList.setSelectedItem(styleList[font.getStyle()]);
}
public static Font showDialog(Frame parent,String s,Font font)
{
FontChooser fd = new FontChooser(parent,true,font);
if (s != null) fd.setTitle(s);
fd.setVisible(true);
Font fo = null;
if (fd.isSelected) fo = Sample.getFont(); //如果选择OK按钮,则获取字体
fd.dispose();
return(fo);
}
private void initAll()
{
getContentPane().setLayout(null);
int W = (int)Toolkit.getDefaultToolkit().getScreenSize().getWidth();
int H = (int)Toolkit.getDefaultToolkit().getScreenSize().getHeight();
setBounds((W-425)/2,(H-400)/2,430,400); //设置字体窗口居屏幕中间显示
addLists();
addButtons();
Sample.setBounds(10,312,400,28);
Sample.setForeground(Color.black);
getContentPane().add(Sample);
addWindowListener(new WindowAdapter()
{public void windowClosing(java.awt.event.WindowEvent e)
{
setVisible (false);
isSelected=false;
}
});
}
private void addLists()
{
FontList = new MyList(GraphicsEnvironment.getLocalGraphicsEnvironment().getAvailableFontFamilyNames());
StyleList = new MyList(styleList);
SizeList = new MyList(sizeList);
FontList.setBounds(10,10,260,295);
StyleList.setBounds(280,10,80,295);
SizeList.setBounds(370,10,40,295);
getContentPane().add(FontList);
getContentPane().add(StyleList);
getContentPane().add(SizeList);
}
private void addButtons()
{
JButton ok = new JButton("确定");
ok.setMargin(new Insets(0,0,0,0));
JButton ca = new JButton("取消");
ca.setMargin(new Insets(0,0,0,0));
ok.setBounds(260,350,70,20);
ok.setFont(new Font(" ",1,12));
ca.setBounds(340,350,70,20);
ca.setFont(new Font(" ",1,12));
getContentPane().add(ok);
getContentPane().add(ca);
ok.addActionListener(new ActionListener()
{public void actionPerformed(ActionEvent e)
{
setVisible(false);
isSelected = true;
}
});
ca.addActionListener(new ActionListener()
{public void actionPerformed(ActionEvent e)
{
setVisible(false);
isSelected = false;
}
});
}
private void showSample()
{
int g = 0;
try {g = Integer.parseInt(SizeList.getSelectedValue());}
catch(NumberFormatException nfe){}
String st = StyleList.getSelectedValue();
int s = Font.PLAIN;
if (st.equalsIgnoreCase("粗体")) s = Font.BOLD;
if (st.equalsIgnoreCase("斜体")) s = Font.ITALIC;
if (st.equalsIgnoreCase("粗斜体")) s = Font.ITALIC | Font.BOLD;
Sample.setFont(new Font(FontList.getSelectedValue(),s,g));
Sample.setHorizontalAlignment(SwingConstants.LEFT);
Sample.setBorder(BorderFactory.createEtchedBorder());
Sample.setText("效果预览，abcdefg");
}
public class MyList extends JPanel
{
JList jl;
JScrollPane sp;
JLabel jt;
String si = " ";
public MyList(String[] values)
{
setLayout(null);
jl = new JList(values);
sp = new JScrollPane(jl);
jt = new JLabel();
jt.setBackground(Color.white);
jt.setForeground(Color.black);
jt.setOpaque(true);
jt.setBorder(new JTextField().getBorder());
jt.setFont(getFont());
jl.setBounds(0,0,100,1000);
jl.setBackground(Color.white);
jl.addListSelectionListener(new ListSelectionListener()
{public void valueChanged(ListSelectionEvent e)
{
jt.setText((String)jl.getSelectedValue());
si = (String)jl.getSelectedValue();
showSample();
}
});
add(sp);
add(jt);
}
public String getSelectedValue()
{
return(si);
}
public void setSelectedItem(String s)
{
jl.setSelectedValue(s,true);
}
public void setBounds(int x, int y, int w ,int h)
{
super.setBounds(x,y,w,h);
sp.setBounds(0,y+12,w,h-23);
sp.revalidate();
jt.setBounds(0,0,w,20);
}
}
}
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