Swing自定义UI的问题

Question

我在练习写一个小游戏组件Tetris, 以及这个组件的两个不同的UI: TetrisUI_1,TetrisUI_2
重载JComponent.updateUI()时    public void updateUI() {
        // setUI(new TetrisUI_1()); // 不希望直接写成这样
        setUI((ButtonUI)UIManager.getUI(this)); // 希望写成这样
    }请问如何将UI通过UIManager与这个组件关联?
两个UI如何通过UIManager切换?

Answer 1

这不正是某种模式的封装吗
如果希望是单例 通过static保证实例长驻且不被外部直接初始化

Answer 2

在程序的main函数中设置
UIManager.setLookAndFeel(lookAndFeel);
或者在别的地方设置
总之要在updateUI前设置
这样刷新的时候就把ui换掉了

Answer 3

UIManager.setLookAndFeel()是设置整个程序的LAF, 现在只是增加一个组件的UI
这样行不通吧

Answer 4

UI与组件关联的方法自己找到了public class Tetris extends JComponent {
    private static final String uiClassID = "TetrisUI";
    public String getUIClassID() {
        return uiClassID;
    }
    // ...
}
public class Test extends JFrame {
    public static void main(String[] args) {
        UIManager.getDefaults().put("TetrisUI", "com.*.TetrisUI_1"); // UI与组件关联
        // ...
    }
}

Answer 5

两个UI如何通过UIManager动态切换, 如何做?  btn.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
if(UIManager.getDefaults().containsKey("TetrisUI")) {
UIManager.getDefaults().remove("TetrisUI");
}
UIManager.getDefaults().put("TetrisUI", "com.*.TetrisUI_2");
}不会生效呢
继续请教...

Answer 6

还不是很明白你想做什么东西import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;import com.sun.java.swing.plaf.windows.WindowsButtonUI;public class TestLookAndFeel extends JFrame {    private TestButton lookAndFeelButton;    public TestLookAndFeel() {
        this.initParam();
        JPanel contentPanel = new JPanel();
        contentPanel.add(this.lookAndFeelButton);
        this.getContentPane().add(contentPanel);
    }    private void initParam() {
        this.lookAndFeelButton = new TestButton("lookAndFeelButton");
        this.lookAndFeelButton.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent e) {
                UIManager.getDefaults().put("ButtonUI", "ButtonUI2");
                TestLookAndFeel.this.lookAndFeelButton.setChangeUI(true);
                TestLookAndFeel.this.lookAndFeelButton.updateUI();
            }
        });
    }    /**
     * @param args
     */
    public static void main(String[] args) {
        TestLookAndFeel test = new TestLookAndFeel();
        test.setVisible(true);
        test.setSize(200, 200);
        test.setDefaultCloseOperation(EXIT_ON_CLOSE);
    }    class TestButton extends JButton {
        private boolean changeUI = false;        public TestButton(String string) {
            super(string);
        }        public String getUIClassID() {
            if (this.changeUI) {
                this.changeUI = false;
                return UIManager.getDefaults().getString("ButtonUI");
            }
            return super.getUIClassID();
        }        @Override
        public void updateUI() {
            if ("ButtonUI2".equals(getUIClassID())) {
                this.setUI(new WindowsButtonUI());
            } else {
                super.updateUI();
            }
        }        public void setChangeUI(boolean changeUI) {
            this.changeUI = changeUI;
        }
    }
}

Answer 7

小有启发, 原来修改UIManager后应更新    btn.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent e) {
        if(UIManager.getDefaults().containsKey("TetrisUI")) {
            UIManager.getDefaults().remove("TetrisUI");
        }
        UIManager.getDefaults().put("TetrisUI", "com.*.TetrisUI_2");
        // tetris.updateUI(); // 更新单个组件
        SwingUtilities.updateComponentTreeUI(gamePanel); // 更新整个组件树
    }