【進階JAVA】第一次作業–小畫家GUI

PainterFrame.java

這是一個繼承JFrame 的 class，實際上執行的main 放在下面的PainterTest檔案裡。

 
 public class PainterFrame extends JFrame{
 private final JComboBox  paintingToolsBox;
 private final String toolsArray[] = {"筆刷","直線","橢圓形","矩形","圓角矩形"}; 
 private final JPanel northPnl;
 private final JPanel radioButtonPnl;
 private final JPanel northRightPnl;
 private final JPanel northLeftPnl;
 private final JPanel canvasPnl;
 private final JRadioButton smallRadioButton;
 private final JRadioButton mediumRadioButton;
 private final JRadioButton largeRadioButton;
 private final ButtonGroup radioGroup;
 private final JLabel label1;
 private final JLabel label2;
 private final JLabel label3;
 private final JLabel statusBarLabel;
 private final JCheckBox fillCheckBox;
 private final JButton button1;
 private final JButton button2;
 private final JButton button3;
 
 
 public PainterFrame() {
  super("小畫家");
  BorderLayout layOut = new BorderLayout();
  setLayout(layOut);
  //welcome message
  
  //JCombobox
  paintingToolsBox = new JComboBox(toolsArray);
  paintingToolsBox.addItemListener(
    new ItemListener()
    {
     @Override
     public void itemStateChanged(ItemEvent e)
     {
      if(e.getStateChange() == ItemEvent.SELECTED)
       System.out.printf(
           "選擇  %s\r\n",toolsArray[paintingToolsBox.getSelectedIndex()]);
     }
     
    });
  
  //上面大Panel
  northPnl = new JPanel();
  GridLayout northLayout = new GridLayout(1,2);
  northPnl.setLayout(northLayout);
  //右上panel
  northRightPnl = new JPanel();
  GridLayout northRightLayout =  new GridLayout(2,3);
  northRightPnl.setLayout(northRightLayout);
  //左上panel
  northLeftPnl = new JPanel();
  GridLayout northLeftLayout = new GridLayout(1,3,10,10);
  northLeftPnl.setLayout(northLeftLayout);
  //radioButton panel
  radioButtonPnl = new JPanel();
  radioButtonPnl.setLayout(new GridLayout());
  //drawing Panwl
  canvasPnl = new JPanel();
  //labels
  label1 = new JLabel("繪圖工具");
  label2 = new JLabel("筆刷大小");
  label3 = new JLabel("填滿");
  
  //radioButtons
  smallRadioButton = new JRadioButton("小",false);
  mediumRadioButton = new JRadioButton("中",false);
  largeRadioButton = new JRadioButton("大",false);
  radioButtonPnl.add(smallRadioButton);
  radioButtonPnl.add(mediumRadioButton);
  radioButtonPnl.add(largeRadioButton);
  smallRadioButton.addItemListener(
                new RadioButtonHandler(smallRadioButton.getText()));
  mediumRadioButton.addItemListener(
                new RadioButtonHandler(mediumRadioButton.getText()));
  largeRadioButton.addItemListener(
                new RadioButtonHandler(largeRadioButton.getText()));
  //checkBox
  fillCheckBox = new JCheckBox();
  CheckBoxHandler checkBoxHandler= new CheckBoxHandler();
  fillCheckBox.addItemListener(checkBoxHandler);
  //buttons
  button1 = new JButton("前景色");
  button2 = new JButton("背景色");
  button3 = new JButton("清除畫面");
  
  button1.addActionListener(new ButtonHandler(button1.getText()));
  button2.addActionListener(new ButtonHandler(button2.getText()));
  button3.addActionListener(new ButtonHandler(button3.getText()));
  
  
  //create logical relationship between JRadioButtons
  radioGroup = new ButtonGroup();
  radioGroup.add(smallRadioButton);
  radioGroup.add(mediumRadioButton);
  radioGroup.add(largeRadioButton);
  
  //status bar,mouse handler
  statusBarLabel = new JLabel();
  MouseHandler mouseHandler = new MouseHandler();
  canvasPnl.addMouseMotionListener(mouseHandler);
  
  northRightPnl.add(label1);//1
  northRightPnl.add(label2);//2
  northRightPnl.add(label3);//3
  northRightPnl.add(paintingToolsBox);//4
  northRightPnl.add(radioButtonPnl);//5
  northRightPnl.add(fillCheckBox);//6
  northLeftPnl.add(button1);
  northLeftPnl.add(button2);
  northLeftPnl.add(button3);
  northPnl.add(northRightPnl);
  northPnl.add(northLeftPnl);
  add(northPnl,layOut.NORTH);
  add(canvasPnl,BorderLayout.CENTER);
  add(statusBarLabel,BorderLayout.SOUTH);
 }//end constructor
  
 private class RadioButtonHandler implements ItemListener {
  public String size;
  public RadioButtonHandler(String size) {
   this.size = size;
  }//end constructor
  @Override 
  public void itemStateChanged(ItemEvent e) {
   if(e.getStateChange() == ItemEvent.SELECTED)
    System.out.printf("選擇  %s 筆刷\r\n", size);
  }//end itemStatechanged
 }//end radioButtonHandler
 
 private class CheckBoxHandler implements ItemListener{
  @Override
  public void itemStateChanged(ItemEvent e) {
   if(e.getStateChange() == ItemEvent.SELECTED)
    System.out.println("選擇填滿");
   else
    System.out.println("取消填滿");
  }//end itemStateChanged
  
 }//end CheckBoxHandler
 
 private class ButtonHandler implements ActionListener{
  public String text;
  public ButtonHandler(String text) {
   this.text = text;
  }//end constructor
  @Override 
  public void actionPerformed(ActionEvent e) {
   System.out.printf("點選  %s\r\n",text);
  }
 }//end ButtonHandler
 
 private class MouseHandler extends MouseAdapter{
  @Override
  public void mouseMoved(MouseEvent e) {
   statusBarLabel.setText((String.format("游標位置 [%d,%d]", e.getX(),e.getY())));
  }//end mouseMoved
 }//end mouseHandler
}//end class

這是 main 檔

import javax.swing.JFrame;
import javax.swing.JOptionPane;


public class PainterTest {
 public static void main(String[]args) {
  PainterFrame painterFrame = new PainterFrame();
  
  painterFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  painterFrame.setSize(1000, 500);
  painterFrame.setVisible(true);
  JOptionPane.showMessageDialog(painterFrame, "wellcome", "訊息", JOptionPane.PLAIN_MESSAGE);
 }//end main
}//end class