在不可编辑的jcombobox中更改所选值的颜色

时间:2013-01-04 18:01:36

标签: java swing jcombobox

如何在不可编辑的jcombobox中更改所选值的颜色?

我知道我必须使用自定义渲染器来更改组合框下拉列表中显示的项目的颜色。我也知道可以与组合框的编辑器组件一起使用的setForeground()方法,但这只适用于可编辑的组合框。我也知道我可以使用UIManager类,但这会影响这些属性。

但是,这些不是我需要的。这张图片

enter image description here

显示了我想要影响的部分。

2 个答案:

答案 0 :(得分:3)

  

如何更改不可编辑的所选值的颜色   的JComboBox?

  • 更改UIManager
  • 的值
  

这是可编辑的基本解决方法(删除背景到   当前背景,注意MetalComboBoxButton中有快捷方式,   然后是外观和感觉敏感,适用于金属和   物质L& f only)

enter image description here

import java.awt.*;
import java.util.Vector;
import javax.swing.*;
import javax.swing.UIManager;
import javax.swing.plaf.ColorUIResource;
import javax.swing.plaf.metal.MetalComboBoxButton;

public class MyComboBox {

    private Vector<String> listSomeString = new Vector<String>();
    private JComboBox someComboBox = new JComboBox(listSomeString);
    private JComboBox editableComboBox = new JComboBox(listSomeString);
    private JComboBox non_EditableComboBox = new JComboBox(listSomeString);
    private JFrame frame;

    public MyComboBox() {
        //for (int i = 0; i < 100000; i++) {
            listSomeString.add("-");
            listSomeString.add("Snowboarding");
            listSomeString.add("Rowing");
            listSomeString.add("Knitting");
            listSomeString.add("Speed reading");
        //}
//
        someComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
        someComboBox.setFont(new Font("Serif", Font.BOLD, 16));
        someComboBox.setEditable(true);
        someComboBox.getEditor().getEditorComponent().setBackground(Color.YELLOW);
        ((JTextField) someComboBox.getEditor().getEditorComponent()).setBackground(Color.YELLOW);
//
        editableComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
        editableComboBox.setFont(new Font("Serif", Font.BOLD, 16));
        editableComboBox.setEditable(true);
        JTextField text = ((JTextField) editableComboBox.getEditor().getEditorComponent());
        text.setBackground(Color.YELLOW);
        JComboBox coloredArrowsCombo = editableComboBox;
        Component[] comp = coloredArrowsCombo.getComponents();
        for (int i = 0; i < comp.length; i++) {// hack valid only for Metal L&F
            if (comp[i] instanceof MetalComboBoxButton) {
                MetalComboBoxButton coloredArrowsButton = (MetalComboBoxButton) comp[i];
                coloredArrowsButton.setBackground(null);
                break;
            }
        }
//
        non_EditableComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
        non_EditableComboBox.setFont(new Font("Serif", Font.BOLD, 16));
//
        frame = new JFrame();
        frame.setLayout(new GridLayout(0, 1, 10, 10));
        frame.add(someComboBox);
        frame.add(editableComboBox);
        frame.add(non_EditableComboBox);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocation(100, 100);
        frame.pack();
        frame.setVisible(true);

        //System.out.println(listSomeString.size());
        //System.out.println(someComboBox.getItemCount());
        //System.out.println(editableComboBox.getItemCount());
        //System.out.println(non_EditableComboBox.getItemCount());
    }

    public static void main(String[] args) {
        UIManager.put("ComboBox.background", new ColorUIResource(Color.yellow));
        UIManager.put("JTextField.background", new ColorUIResource(Color.yellow));
        UIManager.put("ComboBox.selectionBackground", new ColorUIResource(Color.magenta));
        UIManager.put("ComboBox.selectionForeground", new ColorUIResource(Color.blue));
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                MyComboBox aCTF = new MyComboBox();
            }
        });
    }
}

答案 1 :(得分:0)

使comboBox可编辑

获取comboBox的编辑器组件

将editorComponent设置为focusable(false)

不确定这是你所追求的,因为你仍然可以更改所选项目,但无法专注于editorComponent来更改项目。