Swing レイアウト 2

Swing レイアウト 2

[Swing]

• FlowLayout
• GridBagLayout
• GridLayout

FlowLayout

L to R

R to L

GridBagLayout

グリッドの位置

結果

GridLayout

ソースコード

import java.awt.BorderLayout;
import java.awt.ComponentOrientation;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

@SuppressWarnings("serial")
public class LayoutTest2 extends JFrame {
  /**
   * FlowLayout test
   * @see http://java.sun.com/docs/books/tutorial/uiswing/layout/flow.html
   */
  public void testFlowLayout() {
    JFrame frame = new JFrame("FlowLayout Test");
    
    Container pane = frame.getContentPane();
    
    final JPanel panel1 = new JPanel(new FlowLayout());
    class MyMethodLocalActionListener implements ActionListener {
      MyMethodLocalActionListener() {
      }
      public void actionPerformed(ActionEvent e) {
        ComponentOrientation co = null;
        if ("L to R".equals(((JButton)e.getSource()).getText())) {
          co = ComponentOrientation.LEFT_TO_RIGHT;
        } else {
          co = ComponentOrientation.RIGHT_TO_LEFT;
        }
        panel1.setComponentOrientation(co);
        panel1.validate();
        panel1.repaint();
      }
    }

    JButton btn1 = new JButton("L to R");
    btn1.addActionListener(new MyMethodLocalActionListener());
    JButton btn2 = new JButton("R to L");
    btn2.addActionListener(new MyMethodLocalActionListener());
    
    panel1.add(btn1);
    panel1.add(new JTextField("text 1", 10));
    panel1.add(new JTextField("text 2", 20));
    panel1.add(btn2);
    
    pane.add(panel1);
    frame.pack();
    frame.setVisible(true);
  }

  /**
   * GridBagLayout test
   * @see http://java.sun.com/docs/books/tutorial/uiswing/layout/gridbag.html
   */
  public void testGridBagLayout() {
    JFrame frame = new JFrame("GridBagLayout Test");
    
    Container pane = frame.getContentPane();
    GridBagLayout gbl = new GridBagLayout();
    pane.setLayout(gbl);
    GridBagConstraints c = new GridBagConstraints();

    int[][] buttonPos = {
        {0,5}/*0*/,
        {0,4}/*1*/,{2,4}/*2*/,{4,4}/*3*/,     
        {0,3}/*4*/,{2,3}/*5*/,{4,3}/*6*/,     
        {0,2}/*7*/,{2,2}/*8*/,{4,2}/*9*/,     
    };
    c.fill = GridBagConstraints.HORIZONTAL;     // 共通設定
    
    c.gridwidth = 6;                            // ↓ 列数設定
    c.gridx = 0;
    c.gridy = 0;
    c.gridwidth = GridBagConstraints.REMAINDER; // ↑ 最終行
    JTextField txtResult = new JTextField("");
    gbl.setConstraints(txtResult, c);
    pane.add(txtResult);
    
    c.gridwidth = 3;                            // ↓ 列数設定
    c.gridx = 0;
    c.gridy = 1;
    JButton btnCE = new JButton("CE");
    gbl.setConstraints(btnCE, c);
    pane.add(btnCE);
    
    c.gridx = 3;
    c.gridy = 1;
    c.gridwidth = GridBagConstraints.REMAINDER; // ↑ 最終行
    JButton btnC = new JButton("C");
    gbl.setConstraints(btnC, c);
    pane.add(btnC);
    
    c.gridwidth = 2;                           // ↓ 列数設定
    for (int i=0; i<10; i++) {
      c.gridx = buttonPos[i][0];
      c.gridy = buttonPos[i][1];
      JButton  btnN = new JButton(String.valueOf(i));
      gbl.setConstraints(btnN, c);
      pane.add(btnN);
    }
    
    c.gridx = 2;
    c.gridy = 5;
    JButton  btnP = new JButton("+");
    gbl.setConstraints(btnP, c);
    pane.add(btnP);

    c.gridx = 4;
    c.gridy = 5;
    JButton  btnM = new JButton("-");
    gbl.setConstraints(btnM, c);
    pane.add(btnM);
        
    frame.pack();
    frame.setVisible(true);
  } 
  /**
   * GridLayout test
   * @see http://java.sun.com/docs/books/tutorial/uiswing/layout/grid.html
   */
  public void testGridLayout() {
    JFrame frame = new JFrame("GridLayout Test");
    final Container pane = frame.getContentPane();
    pane.setLayout(new BorderLayout());
    
    final GridLayout gridLayout = new GridLayout(3,3);
    final JPanel gridPanel = new JPanel(gridLayout);
    for (int i=0; i<9; i++) {
      gridPanel.add(new JButton(String.valueOf(i)));
    }
    
    JPanel ctrlPanel = new JPanel(new BorderLayout());
    JSlider slider =  new JSlider(0 ,50);
    slider.addChangeListener(
        new ChangeListener() {
          public void stateChanged(ChangeEvent e) {
            int val = ((JSlider)e.getSource()).getValue();
            gridLayout.setHgap(val);
            gridLayout.setVgap(val);
            gridLayout.layoutContainer(gridPanel);
          }
        }
    );
    ctrlPanel.add(new JLabel("gap 0 - 50"), BorderLayout.NORTH);
    ctrlPanel.add(slider, BorderLayout.CENTER);
    
    pane.add(ctrlPanel, BorderLayout.NORTH);
    pane.add(gridPanel, BorderLayout.CENTER);
    frame.pack();
    frame.setVisible(true);
  }

  /* ******* 以下メニュー用 ********* */
  public LayoutTest2() {
    setTitle("Layout Test 2");
  
    JButton btn1 = new JButton("flow");
    btn1.addActionListener(new MyActionListener("flow"));
    
    JButton btn2 = new JButton("gridbag");
    btn2.addActionListener(new MyActionListener("gridbag"));
    
    JButton btn3 = new JButton("grid");
    btn3.addActionListener(new MyActionListener("grid"));
    
    JPanel pane = new JPanel();
    pane.setLayout(new BoxLayout(pane, BoxLayout.Y_AXIS));
    
    pane.add(btn1);
    pane.add(btn2);
    pane.add(btn3);
    getContentPane().add(pane);
    
    pack();
  }
  class MyActionListener implements ActionListener {
    private String type = null;
    public MyActionListener(String type) {
      this.type = type;
    }
    public void actionPerformed(ActionEvent e) {
      if ("flow".equals(this.type)) {
        testFlowLayout();
      }
      if ("gridbag".equals(this.type)) {
        testGridBagLayout();
      }
      if ("grid".equals(this.type)) {
        testGridLayout();
      }
    }
  }
  public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
      // UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
    } catch (Exception e) {
      e.printStackTrace();
    }
    SwingUtilities.invokeLater(
      new Runnable() {
        public void run() {
          LayoutTest2 lt = new LayoutTest2();
          lt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          lt.setVisible(true);
        }
      }
    );
  }
}