java - Jprogressbar.setStringpainted(true);正在画两个字符串

Question

这段代码产生了一个问题，当我点击按钮时，两个字符串被绘制一个水平和一个垂直，但只需要绘制水平字符串，所以请告诉我应该做什么???

import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;





public class R implements ActionListener {


    static int y;
    CustomProgressBar b = new CustomProgressBar();



    public static void main(String arg[]) throws Exception {
        new R();
    }



    public R() throws Exception {
        JFrame f = new JFrame();
        JButton btn = new JButton("Click");
        f.setExtendedState(JFrame.MAXIMIZED_BOTH);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setUndecorated(true);
        f.setLayout(new FlowLayout());
        btn.addActionListener(this);
        f.add(b);
        f.add(btn);
        f.setVisible(true);
    }



    class CustomProgressBar extends JProgressBar{


        private static final long serialVersionUID = 1L;
        private boolean isStringToBePainted = false;
        public CustomProgressBar() {
            super(JProgressBar.VERTICAL,0,100);
        }



        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            if(isStringToBePainted ) {
                Dimension size = CustomProgressBar.this.getSize();
                if( CustomProgressBar.this.getPercentComplete()<0.9  )
                    R.y = (int)( size.height - size.height * CustomProgressBar.this.getPercentComplete() );     
                String text = getString();
                g.setColor(Color.BLACK );
                g.drawString(text, 0, R.y);
            }
        }
        @Override
        public void setStringPainted(boolean b) {
            super.setStringPainted(b);
            isStringToBePainted=b;
        }
    }



    @Override
    public void actionPerformed(ActionEvent e) {
        b.setStringPainted(true);
    }

}

Answer 1

问题是，属性 setStringPainted 已由组件定义，并且具有预定义的功能...您知道似乎想要更改...

您需要定义一个自己可以控制的新属性，或者更改 UI 委托(delegate)的工作方式，这是一项艰巨的工作，因为您需要为您可能想要的每种外观和感觉提供一个属性支持...

您可以(稍微)作弊，而不是进行自定义绘画...并使用 JLabel 代替，例如...

class CustomProgressBar extends JProgressBar {

    private static final long serialVersionUID = 1L;
    private boolean isStringToBePainted = false;

    private JLabel progress;

    public CustomProgressBar() {
        super(JProgressBar.VERTICAL, 0, 100);

        progress = new JLabel("0%");
        setLayout(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.weighty = 1;
        gbc.weightx = 1;
        gbc.anchor = GridBagConstraints.SOUTH;
        add(progress, gbc);
    }

    @Override
    public Dimension getPreferredSize() {
        Dimension size = super.getPreferredSize();
        Dimension labelSize = progress.getPreferredSize();
        Insets insets = getInsets();
        if (size.width < labelSize.width) {
            size.width = insets.left + insets.right + labelSize.width;
        }
        return size;
    }

}

您仍然需要提供自己的属性来打开或关闭它，但这是一个想法......

(ps-我快速浏览了一下尝试实现我自己的 UI 委托(delegate)，在复制并粘贴我的第三种方法后，我放弃了，因为这只是比提供奖励更多的工作)