mynotepad.java

我自己做的简单记事本

                        find.showReplace();
                }

                else if(e.getSource()==itemCut)
                {
                        temp=text.getSelectedText();
                        StringBuffer tmp=new StringBuffer(text.getText());
                        int start=text.getSelectionStart();
                        int end=text.getSelectionEnd();
                        tmp.delete(start, end);
                        text.setText(tmp.toString());
                        text.setSelectionStart(start);
                }

                else if(e.getSource()==itemDelete)
                {
                        StringBuffer tmp=new StringBuffer(text.getText());
                        int start=text.getSelectionStart();
                        int end=text.getSelectionEnd();
                        tmp.delete(start, end);
                        text.setText(tmp.toString());
                        text.setSelectionStart(start);
                }

                else if(e.getSource()==itemCopy)
                {
                        temp=text.getSelectedText();
                }

                else if(e.getSource()==itemPaste)
                {
                        int start=text.getSelectionStart();
                        text.insert(temp, start);
                }

                else if(e.getSource()==itemSelectAll)
                {
                        text.selectAll();
                }

                else if(e.getSource()==itemTime)
                {
                        java.text.SimpleDateFormat timeObj=new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
                        this.text.append("\n"+timeObj.format(new java.util.Date()));
                }

        /*	else if(e.getSource()==itemWrap)
                {
                        text.getFont();
                        if(text.getSelectionEnd()==text.WIDTH)
                        {
                                text.append("\n");
                        }
                }

                else if(e.getSource()==itemUndo)
                {

                }
*/
                else if(e.getSource()==itemBgColor)
                {
                        text.requestFocus();
                        Color color=JColorChooser.showDialog(this, "change background color", Color.white);
                        if(color!=null)
                        {
                                text.setBackground(color);
                        }
                        else
                                return;
                }

                else if(e.getSource()==itemFgColor)
                {
                        text.requestFocus();
                        Color color=JColorChooser.showDialog(this, "change foreground color", Color.black);
                        if(color!=null)
                        {
                                text.setForeground(color);
                        }
                        else
                                return;
                }

                else if(e.getSource()==itemFont)
                {
                        font=new Dialog(this,"font");
                        font.setLocation(250,250);
                        font.setLayout(new FlowLayout());
                        Label topic=new Label("font setting");
                        Label sample=new Label("sample:my simple notepad!");
                        List list=new List(6,false);
                        list.add("Plain");
                        list.add("Bold");
                        list.add("Italic");
                        list.add("Bold+Italic");
                        MyItemListener ItemObj=new MyItemListener(sample);
                        list.addItemListener(ItemObj);
                        Button ok=new Button("ok");
                        ok.addActionListener(new MyButtonListener(this.text,font,list));
                        ok.setSize(new Dimension(20,5));
                        font.add(topic);
                        font.add(list);
                        font.add(sample);
                        font.add(ok);
                        font.addWindowListener(new WindowAdapter()
                        {
                                public void windowClosing(WindowEvent ee)
                                {
                                        font.dispose();
                                }
                        }
                        );
                        font.setSize(180,240);
                        font.setResizable(false);
                        font.setVisible(true);
                }

                else if(e.getSource()==itemAbout)
                {
                        about=new Dialog(this,"about notepad");
                        TextArea ta=new TextArea("welcome to use this notepad!\n\nwriter: Zhou Xinyu");
                        ta.setEditable(false);
                        about.add(ta);
                        about.setBounds(250, 300, 200, 200);
                        about.setResizable(false);
                        about.setVisible(true);
                        about.addWindowListener(new WindowAdapter()
                        {
                                public void windowClosing(WindowEvent e)
                                {
                                        about.dispose();
                                }
                        }
                        );
                }
        }

/*        class undoHandler implements UndoableEditListener
        {
            public void undoableEditHappened(undoableEditEvent ue)
            {
                undo.addEdit(ue);
            }
        }
*/
}

class MyButtonListener implements ActionListener
{
        TextArea text;
        Dialog font;
        List list;

        public MyButtonListener(TextArea text,Dialog font,List list)
        {
                this.list=list;
                this.font=font;
                this.text=text;
        }

        public void actionPerformed(ActionEvent e)
        {
                font.setVisible(false);
                switch(list.getSelectedIndex())
                {
                case 0:
                {
                        text.setFont(new Font("Times new Roman",Font.PLAIN,text.getFont().getSize()));
                        break;
                }
                case 1:
                {
                        text.setFont(new Font("Times new Roman",Font.BOLD,text.getFont().getSize()));
                        break;
                }
                case 2:
                {
                        text.setFont(new Font("Times new Roman",Font.ITALIC,text.getFont().getSize()));
                        break;
                }
                case 3:
                {
                        text.setFont(new Font("Times new Roman",Font.ITALIC+Font.BOLD,text.getFont().getSize()));
                        break;
                }
                }
        }
}

class MyItemListener implements ItemListener
{
        Label text;

        public MyItemListener(Label text)
        {
                this.text=text;
        }

        public void itemStateChanged(ItemEvent e)
        {
                int id_font=((java.awt.List)e.getSource()).getSelectedIndex();
                switch(id_font)
                {
                case 0:
                {
                        text.setFont(new Font("Times new Roman",Font.PLAIN,text.getFont().getSize()));
                        break;
                }
                case 1:
                {
                        text.setFont(new Font("Times new Roman",Font.BOLD,text.getFont().getSize()));
                        break;
                }
                case 2:
                {
                        text.setFont(new Font("Times new Roman",Font.ITALIC,text.getFont().getSize()));
                        break;
                }
                case 3:
                {
                        text.setFont(new Font("Times new Roman",Font.ITALIC+Font.BOLD,text.getFont().getSize()));
                        break;
                }
                }
        }
}

class Find extends Dialog implements ActionListener
{

        Label lFind=new Label("search : ");
        Label lReplace=new Label("replace : ");
        TextField tFind=new TextField(10);
        TextField tReplace=new TextField(10);
        Button bFind=new Button("search");
        Button bReplace=new Button("replace");
        TextArea content;

        public Find(Frame owner,TextArea content)
        {
                super(owner,"search",false);
                this.content=content;
                setLayout(null);
                lFind.setBounds(10,30,80,20);
                lReplace.setBounds(10,70,80,20);
                tFind.setBounds(90,30,90,20);
                tReplace.setBounds(90,70,90,20);
                bFind.setBounds(190,30,80,20);
                bReplace.setBounds(190,70,80,20);
                add(lFind);
                add(tFind);
                add(bFind);
                add(lReplace);
                add(tReplace);
                add(bReplace);
                setResizable(false);
                bFind.addActionListener(this);
                bReplace.addActionListener(this);
                addWindowListener(new WindowAdapter()
                {
                        public void windowClosing(WindowEvent e)
                        {
                                Find.this.dispose();//remember it
                        }
                });
                this.setLocation(250,320);
        }

        public void showFind()
        {
                setTitle("search");
                setSize(280,55);
                setVisible(true);
        }

        public void showReplace()
        {
                setTitle("replace");
                setSize(280,110);
                setVisible(true);
        }

        public void find()
        {
                String text=content.getText();
                String str=tFind.getText();
                int end=text.length();
                int len=str.length();
              //  int start=content.getCaretPosition();
                int start=content.getSelectionEnd();//search from the location of the cursor;
                boolean find=true;
                if(start==end)
                {
                        start=0;
                }
                for(;start<=end-len;start++)
                {
                        if(text.substring(start,start+len).equals(str)){
                          content.select(start,start+len);
                //		content.setSelectionStart(start);
                //		content.setSelectionEnd(start+len);
                        //	this.setVisible(false);
                                content.requestFocus();
                                find=true;
                                return;
                        }
                        find=false;
                }
                if(find==false){
                        JOptionPane.showMessageDialog(this, "this is the last one");
                }
        }

        public void replace()
        {
                String str=tReplace.getText();
                if(content.getSelectedText().equals(tFind.getText()))
                {
                        content.replaceRange(str, content.getSelectionStart(), content.getSelectionEnd());
                //	this.setVisible(false);
                }
                else
                {
                        find();
                        content.replaceRange(str, content.getSelectionStart(), content.getSelectionEnd());
        //		this.setVisible(false);
                }
        }

        public void actionPerformed(ActionEvent e)
        {
                if(e.getSource()==bFind)
                {
                        find();
                }
                else if(e.getSource()==bReplace)
                {
                        replace();
                }
        }
}

public class MyNotepad
{
        public static void main(String args[])
        {
                new FileWindows();
        }
}