checkandradiodemo.java

来自「Java 程序设计源码 只提供了部分」· Java 代码 · 共 134 行

import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JFrame;
import javax.swing.JCheckBox;
import javax.swing.JTextField;
import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;
import javax.swing.JPanel;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.Component;
import java.awt.Font;
import java.awt.Color;

public class CheckAndRadioDemo extends JFrame
    implements ActionListener {
  private JTextField textDemo;
  private JCheckBox ckbBold, ckbItalic;
  private JRadioButton rdbRed, rdbGreen, rdbBlack;
  private ButtonGroup btg;
  private JPanel checkPanel, radioPanel;
  private Container container;
  private GridBagLayout layout;
  private GridBagConstraints constraints;

  public CheckAndRadioDemo() {
    super("Text Processor");
    setSize(260,200);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    container = this.getContentPane();
  }

  private void addComponent(JPanel panel, GridBagLayout layout, GridBagConstraints
                            gbc, Component com, int row, int column, int numRows,
                            int numColumns, int Weightx, int Weighty) {
    gbc.gridx = row;
    gbc.gridy = column;
    gbc.gridwidth = numRows;
    gbc.gridheight = numColumns;
    gbc.weightx = Weightx;
    gbc.weighty = Weighty;

    layout.setConstraints(com, gbc);

    container.add(com);
  }

  public void setLayout() {
    checkPanel = new JPanel();
    checkPanel.setLayout(new GridLayout(2, 1));

    ckbBold = new JCheckBox("Bold");
    ckbBold.addActionListener(this);
    ckbItalic = new JCheckBox("Italic");
    ckbItalic.addActionListener(this);

    checkPanel.add(ckbBold);
    checkPanel.add(ckbItalic);

    radioPanel = new JPanel();
    radioPanel.setLayout(new GridLayout(3, 1));

    rdbRed = new JRadioButton("Red");
    rdbRed.addActionListener(this);
    rdbGreen = new JRadioButton("Green");
    rdbGreen.addActionListener(this);
    rdbBlack = new JRadioButton("Black");
    rdbBlack.addActionListener(this);

    rdbBlack.setSelected(true);

    btg = new ButtonGroup();

    btg.add(rdbRed);
    btg.add(rdbGreen);
    btg.add(rdbBlack);
    //这里可否将 btg 加入radioPanel 就可以了？
    radioPanel.add(rdbRed);
    radioPanel.add(rdbGreen);
    radioPanel.add(rdbBlack);

    layout = new GridBagLayout();
    container.setLayout(layout);
    constraints = new GridBagConstraints();
    constraints.anchor = GridBagConstraints.CENTER;

    textDemo = new JTextField("示例文字");
    constraints.fill = GridBagConstraints.HORIZONTAL;
    addComponent((JPanel)container, layout, constraints, textDemo, 0, 0, 2, 1, 100, 30);

    constraints.fill = GridBagConstraints.BOTH;
    addComponent((JPanel)container, layout, constraints, checkPanel, 0, 1, 1, 1, 50, 70);

    constraints.fill = GridBagConstraints.BOTH;
    addComponent((JPanel)container, layout, constraints, radioPanel, 1, 1, 1, 1, 50, 70);
  }

  public static void main(String[] args) {
    CheckAndRadioDemo card = new CheckAndRadioDemo();
    card.setSize(260,200);
    card.setLayout();
    card.setVisible(true);
  }

  public void actionPerformed(ActionEvent e) {
    int intBold = 0;
    int intItalic = 0;

    if(e.getSource() instanceof JCheckBox) {
      intBold = (ckbBold.isSelected() ? Font.BOLD : Font.PLAIN);

      intItalic = (ckbItalic.isSelected() ? Font.ITALIC : Font.PLAIN);

      textDemo.setFont(new Font("Serif", intBold + intItalic, 12));
    }

    if(e.getSource() instanceof JRadioButton) {
      if(rdbBlack.isSelected()){
        textDemo.setForeground(Color.black);
      }
      else if(rdbRed.isSelected()) {
        textDemo.setForeground(Color.red);
      }
      else if(rdbGreen.isSelected()) {
        textDemo.setForeground(Color.green);
    }
    }
  }
 }