Question

我正在使用Nimbus的外观和感觉。

我有两个JCheckBox，默认情况下，启用JCheckBox时文本为黑色，禁用时显示为灰色。我的新要求是程序应该忽略JCheckBox的启用状态，而是在isSelected（）为false时显示为灰色，并在isSelected（）为true时显示指定颜色的文本。

我试图通过以下方式做到这一点：

扩展BasicCheckBoxUI
覆盖paintText方法
复制BasicButtonUI.paintText（）的内容并修改行为

使用我的新UI类的实例调用相关JCheckBox上的setUI

private static class MyCheckBoxUI extends BasicCheckBoxUI
{
    private Color selectedColor;

    public MyCheckBoxUI( Color selectedColor )
    {
        this.selectedColor = selectedColor;
    }

    @Override
    protected void paintText( Graphics g, AbstractButton b, Rectangle textRect, String text )
    {
        ButtonModel model = b.getModel();
        FontMetrics fm = SwingUtilities2.getFontMetrics(b, g);
        int mnemonicIndex = b.getDisplayedMnemonicIndex();

        if( model.isSelected() ) 
        {
            /*** paint the text normally */
            g.setColor( selectedColor );
            SwingUtilities2.drawStringUnderlineCharAt(b, g,text, mnemonicIndex,
                                      textRect.x + getTextShiftOffset(),
                                      textRect.y + fm.getAscent() + getTextShiftOffset());
        }
        else 
        {
            /*** paint the text disabled ***/
            g.setColor(b.getBackground().brighter());
            SwingUtilities2.drawStringUnderlineCharAt(b, g,text, mnemonicIndex,
                                      textRect.x, textRect.y + fm.getAscent());
            g.setColor(b.getBackground().darker());
            SwingUtilities2.drawStringUnderlineCharAt(b, g,text, mnemonicIndex,
                                      textRect.x - 1, textRect.y + fm.getAscent() - 1);
        }
    }
}

在我的JPanel的构造函数中，我有以下内容：

        jCheckBox1.setUI( new MyCheckBoxUI( Color.red ) );
        jCheckBox2.setUI( new MyCheckBoxUI( Color.black ) );

这似乎按预期工作，除非有副作用。现在，复选框不会像以前一样选中框中的勾号（我没想到这一点，因为我只重写了paintText方法）。我错过了什么？

此外，使用SwingUtilities2会让我感到不安，因为我警告说它是一个内部专有API，可以在将来的版本中删除。有更好的方法吗？

Answer 1

您需要使用UIManager颜色属性...

Object disabledTextForeground = UIManager.get("CheckBox[Disabled].textForeground");
Object enabledTextForeground =  UIManager.get("CheckBox.foreground");
UIManager.put("CheckBox[Disabled].textForeground", UIManager.get("CheckBox.foreground"));
UIManager.put("CheckBox[Enabled].textForeground", disabledTextForeground);
UIManager.put("CheckBox[Selected+Enabled].textForeground", enabledTextForeground);

此示例允许您在全局级别修改值，这意味着您创建的每个JCheckBox将具有相同的值

Options

例如......

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestNimbus {

    public static void main(String[] args) {
        new TestNimbus();
    }

    public TestNimbus() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                Object disabledTextForeground = UIManager.get("CheckBox[Disabled].textForeground");
                Object enabledTextForeground =  UIManager.get("CheckBox.foreground");
                UIManager.put("CheckBox[Disabled].textForeground", UIManager.get("CheckBox.foreground"));
                UIManager.put("CheckBox[Enabled].textForeground", disabledTextForeground);
                UIManager.put("CheckBox[Selected+Enabled].textForeground", enabledTextForeground);

                JCheckBox cb1 = new JCheckBox("Option #1");
                JCheckBox cb2 = new JCheckBox("Option #2");
                JCheckBox cb3 = new JCheckBox("Option #3");

                cb1.setSelected(true);
                cb3.setEnabled(false);

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new GridBagLayout());
                GridBagConstraints gbc = new GridBagConstraints();
                gbc.gridwidth = gbc.REMAINDER;
                frame.add(cb1, gbc);
                frame.add(cb2, gbc);
                frame.add(cb3, gbc);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

}

要仅影响JCheckBox的给定实例，您需要直接向要生效的JCheckBox的每个实例提供覆盖...

LocalOptions

前三个值已被覆盖，而后三个值未受影响且使用UI默认值

import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.UIDefaults;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestNimbus {

    public static void main(String[] args) {
        new TestNimbus();
    }

    public TestNimbus() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                UIDefaults checkBoxDefaults = new UIDefaults();

                Object disabledTextForeground = UIManager.get("CheckBox[Disabled].textForeground");
                Object enabledTextForeground = UIManager.get("CheckBox.foreground");
                checkBoxDefaults.put("CheckBox[Disabled].textForeground", UIManager.get("CheckBox.foreground"));
                checkBoxDefaults.put("CheckBox[Enabled].textForeground", disabledTextForeground);
                checkBoxDefaults.put("CheckBox[Selected+Enabled].textForeground", enabledTextForeground);

                JCheckBox cb1 = new JCheckBox("Option #1");
                JCheckBox cb2 = new JCheckBox("Option #2");
                JCheckBox cb3 = new JCheckBox("Option #3");

                JCheckBox cb4 = new JCheckBox("Normal #1");
                JCheckBox cb5 = new JCheckBox("Normal #2");
                JCheckBox cb6 = new JCheckBox("Normal #3");

                configure(cb1, checkBoxDefaults);
                configure(cb2, checkBoxDefaults);
                configure(cb3, checkBoxDefaults);

                cb1.setSelected(true);
                cb4.setSelected(true);
                cb3.setEnabled(false);
                cb6.setEnabled(false);

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new GridBagLayout());
                GridBagConstraints gbc = new GridBagConstraints();
                gbc.gridwidth = gbc.REMAINDER;
                frame.add(cb1, gbc);
                frame.add(cb2, gbc);
                frame.add(cb3, gbc);
                frame.add(cb4, gbc);
                frame.add(cb5, gbc);
                frame.add(cb6, gbc);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }

            private void configure(JCheckBox checkbox, UIDefaults uiDefaults) {
                checkbox.putClientProperty("Nimbus.Overrides", uiDefaults);
//                checkbox.putClientProperty("Nimbus.Overrides.InheritDefaults", false);
            }
        });
    }

}

如何正确更改复选框文本呈现行为？

1 个答案: