Swing レイアウト 3

Swing レイアウト 3

[Swing]

LayoutManagerのカスタマイズ

ソースコード

import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.LayoutManager;
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.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

@SuppressWarnings("serial")
public class LayoutTest3 extends JFrame {
  /**
   * Custom layout test
   * @see http://java.sun.com/docs/books/tutorial/uiswing/layout/custom.html
   */
  public void testCustomLayout() {
    JFrame frame = new JFrame("Custom Layout Test");
    
    Container pane = frame.getContentPane();
    pane.setLayout(new ZigzagLayout());
    
    for (int i=0; i<25; i++) {
      pane.add(new JButton(String.valueOf(i)));
    }
    frame.pack();
    frame.setVisible(true);
  }

  /**
   * カスタマイズした、LayoutManager
   */
  class ZigzagLayout implements LayoutManager {

    public void addLayoutComponent(String name, Component comp) {}
    public void removeLayoutComponent(Component comp) {}
    public Dimension minimumLayoutSize(Container parent) {
      return new Dimension(300,150);
    }
    public Dimension preferredLayoutSize(Container parent) {
      return new Dimension(300,150);
    }

    public void layoutContainer(Container parent) {
      int compCnt = parent.getComponentCount();
    
      int x = 0;
      int y = 0;
      int width  = 25;
      int height = 25;
      boolean isDown = true;
      for (int i=0; i<compCnt; i++) {
        Component c = parent.getComponent(i);
        if (c.isVisible()) {
          if (i > 0) {
            if (i % 5 == 0) {
              isDown = !isDown;
            }
            if (isDown) {
              y += height;
            } else {
              y -= height;
            }
            x += width / 2;
          }
          c.setBounds(x, y, width, height);
        }
      }
    }
  }
  
  /* ******* 以下メニュー用 ********* */
  public LayoutTest3() {
    setTitle("Layout Test 2");
  
    JButton btn1 = new JButton("custom");
    btn1.addActionListener(new MyActionListener("custom"));

    JPanel pane = new JPanel();
    pane.setLayout(new BoxLayout(pane, BoxLayout.Y_AXIS));
    
    pane.add(btn1);
    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 ("custom".equals(this.type)) {
        testCustomLayout();
      }
    }
  }
  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() {
          LayoutTest3 lt = new LayoutTest3();
          lt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          lt.setVisible(true);
        }
      }
    );
  }
}