回答編集履歴
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コード追記
test
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該当するラベルは center_show では?
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#追記
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久しぶりに swing を弄ってみました.
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CD ボタンを押した時の処理は, 無名クラスで設定しています.
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各ボタンの大きさはイベントを受けて修正するようにしています. (SizeUnifier クラス)
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各コンポーネントの配置は座標指定では無く Layout に任せるようにしていますので, ウインドウの大きさを変えると中央のパネルだけが拡縮します.
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```java
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package teratail.q254786;
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import java.awt.*;
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import java.awt.event.*;
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import javax.swing.*;
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public class ExGUISwing_03 extends JFrame {
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protected JButton[] buttons = new JButton[6];
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protected JLabel center_show;
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ExGUISwing_03(){
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super.setTitle("ExGUISwing_03");
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setDefaultCloseOperation(EXIT_ON_CLOSE); //画面を閉じた時に実行を停止する
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setSize(360, 150);
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//テスト用?ラベル
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center_show = new JLabel("Power Off");
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center_show.setFont(new Font("Arial" , Font.BOLD, 19));
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center_show.setForeground(new Color(1,125,0));
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center_show.setSize(100,100);
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//ボタン群
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buttons[0] = new JButton("PW");
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buttons[1] = new JButton("AM");
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buttons[2] = new JButton("FM");
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buttons[3] = new JButton("CD");
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buttons[3].addActionListener(new ActionListener() {
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@Override
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public void actionPerformed(ActionEvent e) {
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center_show.setText("aaa"); // CDのボタンを押した時にパネルの表示を変える。
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}
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});
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buttons[4] = new JButton("Up");
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buttons[5] = new JButton("Down");
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new SizeUnifier(buttons); //各ボタンの大きさを統一
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//画面編成
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Container contentPane = this.getContentPane();
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contentPane.add(createCenterPanel(), BorderLayout.CENTER); //真ん中パネル
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contentPane.add(createButtonPanel(0, 2), BorderLayout.WEST); //左ボタン群
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contentPane.add(createButtonPanel(3, 5), BorderLayout.EAST); //右ボタン群
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}
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/**
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* 中央パネルを生成する
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*/
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private JPanel createCenterPanel() {
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JPanel panel = new JPanel();
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panel.setSize(160,120);
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panel.setBorder(BorderFactory.createCompoundBorder(
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BorderFactory.createEmptyBorder(5, 0, 5, 0), //top,left,botton,right
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BorderFactory.createLoweredBevelBorder()
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));
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panel.add(center_show);
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return panel;
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}
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/**
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* button[i](i=is～ie) のボタンを配置したパネルを生成する
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*/
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private JPanel createButtonPanel(int is, int ie) {
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JPanel panel = new JPanel(null);
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panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
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panel.setSize(100, 150);
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panel.setPreferredSize(panel.getSize());
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for(int i=is; i<=ie; i++) {
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panel.add(Box.createVerticalStrut(5));
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buttons[i].setAlignmentX(JComponent.CENTER_ALIGNMENT);
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panel.add(buttons[i]);
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panel.add(Box.createVerticalStrut(5));
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}
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return panel;
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}
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/**
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* コンストラクタで指定されたコンポーネントの大きさを, 一番大きいものに統一する
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*/
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private class SizeUnifier implements ComponentListener {
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private JComponent components[];
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SizeUnifier(JComponent... components) {
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this.components = components;
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for(JComponent c : components) c.addComponentListener(this);
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}
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@Override
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public void componentResized(ComponentEvent e) {
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int w = 0, h = 0;
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for(JComponent c : components) {
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Dimension size = c.getSize();
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if(w < size.width) w = size.width;
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if(h < size.height) h = size.height;
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}
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for(JComponent c : components) {
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Dimension size = c.getSize();
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if(w != size.width || h != size.height) {
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c.setSize(w,h);
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c.setMaximumSize(c.getSize());
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c.revalidate();
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}
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}
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}
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@Override
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public void componentMoved(ComponentEvent e) {}
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@Override
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public void componentShown(ComponentEvent e) {}
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@Override
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public void componentHidden(ComponentEvent e) {}
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}
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public static void main(String[] args) {
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ExGUISwing_03 ini = new ExGUISwing_03();
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ini.setVisible(true);
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}
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}
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```
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